WO2021099880A1 - 表示装置、表示モジュール、電子機器、及び表示装置の作製方法 - Google Patents
表示装置、表示モジュール、電子機器、及び表示装置の作製方法 Download PDFInfo
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- WO2021099880A1 WO2021099880A1 PCT/IB2020/060504 IB2020060504W WO2021099880A1 WO 2021099880 A1 WO2021099880 A1 WO 2021099880A1 IB 2020060504 W IB2020060504 W IB 2020060504W WO 2021099880 A1 WO2021099880 A1 WO 2021099880A1
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- H01L25/167—Assemblies consisting of a plurality of semiconductor or other solid state devices the devices being of types provided for in two or more different subclasses of H10B, H10D, H10F, H10H, H10K or H10N, e.g. forming hybrid circuits comprising optoelectronic devices, e.g. LED, photodiodes
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- H10H20/013—Manufacture or treatment of bodies, e.g. forming semiconductor layers having light-emitting regions comprising only Group III-V materials
- H10H20/0133—Manufacture or treatment of bodies, e.g. forming semiconductor layers having light-emitting regions comprising only Group III-V materials with a substrate not being Group III-V materials
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- H10H20/822—Materials of the light-emitting regions
- H10H20/824—Materials of the light-emitting regions comprising only Group III-V materials, e.g. GaP
- H10H20/825—Materials of the light-emitting regions comprising only Group III-V materials, e.g. GaP containing nitrogen, e.g. GaN
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- H10H29/10—Integrated devices comprising at least one light-emitting semiconductor component covered by group H10H20/00
- H10H29/14—Integrated devices comprising at least one light-emitting semiconductor component covered by group H10H20/00 comprising multiple light-emitting semiconductor components
- H10H29/142—Two-dimensional arrangements, e.g. asymmetric LED layout
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- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
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- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
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- H01L25/04—Assemblies consisting of a plurality of semiconductor or other solid state devices all the devices being of a type provided for in a single subclass of subclasses H10B, H10D, H10F, H10H, H10K or H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of semiconductor or other solid state devices all the devices being of a type provided for in a single subclass of subclasses H10B, H10D, H10F, H10H, H10K or H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H10H20/00
- H01L25/0753—Assemblies consisting of a plurality of semiconductor or other solid state devices all the devices being of a type provided for in a single subclass of subclasses H10B, H10D, H10F, H10H, H10K or H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H10H20/00 the devices being arranged next to each other
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- H10H20/01—Manufacture or treatment
- H10H20/036—Manufacture or treatment of packages
- H10H20/0364—Manufacture or treatment of packages of interconnections
Definitions
- One aspect of the present invention relates to a display device, a display module, an electronic device, and a method for manufacturing the same.
- One aspect of the present invention is not limited to the above technical fields.
- the technical fields of one aspect of the present invention include semiconductor devices, display devices, light emitting devices, power storage devices, storage devices, electronic devices, lighting devices, input devices (for example, touch sensors), input / output devices (for example, touch panels, etc.). ), Their driving method, or their manufacturing method can be given as an example.
- micro light emitting diode (micro LED (Light Emitting Diode)) as a display device (also referred to as a display element)
- a display device using a micro light emitting diode (micro LED (Light Emitting Diode)) as a display device (also referred to as a display element)
- a display device using a micro light emitting diode (micro LED (Light Emitting Diode)) as a display device (also referred to as a display element)
- Patent Document 1 Display devices that use micro LEDs as display devices have advantages such as high brightness, high contrast, and long life, and are being actively researched and developed as next-generation display devices.
- a display device using a micro LED as a display device it takes an extremely long time to mount the LED chip, and reduction of manufacturing cost is an issue.
- red (R), green (G), and blue (B) LEDs are manufactured on different wafers, and the LEDs are cut out one by one and mounted on a circuit board. Therefore, as the number of pixels of the display device increases, the number of LEDs to be mounted increases, and the time required for mounting increases. Further, the higher the definition of the display device, the higher the difficulty of mounting the LED.
- One aspect of the present invention is to provide a display device having high definition.
- One aspect of the present invention is to provide a display device having a high resolution.
- One aspect of the present invention is to provide a display device having high display quality.
- One aspect of the present invention is to provide a display device having low power consumption.
- One aspect of the present invention is to provide a highly reliable display device.
- One aspect of the present invention is to reduce the manufacturing cost of a display device using a micro LED as a display device.
- One aspect of the present invention is to manufacture a display device using a micro LED as a display device with a high yield.
- One aspect of the present invention is a display device having a transistor, a light emitting diode, a first conductive layer, a second conductive layer, a first insulating layer, and a second insulating layer.
- the transistor is electrically connected to the first conductive layer, and the first conductive layer and the first insulating layer are respectively located on the transistor.
- the second conductive layer is located on the first conductive layer.
- the second insulating layer is located on the first insulating layer.
- the light emitting diode has a first electrode on the second insulating layer, a light emitting layer on the first electrode, and a second electrode on the light emitting layer.
- the second electrode is electrically connected to the second conductive layer.
- the height of the surface of the first conductive layer on the side of the second conductive layer roughly coincides with the height of the surface of the first insulating layer on the side of the second insulating layer.
- the first insulating layer and the second insulating layer are directly bonded to each other.
- the second conductive layer is located inside the opening of the second insulating layer and is electrically connected to the first conductive layer.
- the display device of one aspect of the present invention preferably further has a third insulating layer and a fourth insulating layer.
- the third insulating layer is preferably located between the transistor and the first insulating layer.
- the fourth insulating layer is preferably located between the light emitting diode and the second insulating layer. It is preferable that the first insulating layer and the second insulating layer each have a silicon oxide film.
- the third insulating layer and the fourth insulating layer preferably have at least one of an aluminum oxide film, a hafnium oxide film, and a silicon nitride film, respectively.
- the display device of one aspect of the present invention preferably further has a fifth insulating layer.
- the transistor preferably has a metal oxide layer and a gate electrode.
- the metal oxide layer preferably has a channel forming region. It is preferable that the height of the upper surface of the gate electrode is substantially the same as the height of the upper surface of the fifth insulating layer.
- the transistor preferably has a metal oxide layer, a gate insulating layer, a gate electrode, a third conductive layer, and a fourth conductive layer.
- the metal oxide layer preferably has a channel forming region.
- the metal oxide layer includes a first region that overlaps the third conductive layer, a second region that overlaps the fourth conductive layer, and a third region between the first region and the second region. It is preferable to have.
- the third conductive layer and the fourth conductive layer are preferably located on the metal oxide layer so as to be separated from each other.
- the fifth insulating layer is preferably located on the third conductive layer and the fourth conductive layer.
- the fifth insulating layer preferably has an opening that overlaps the third region.
- the gate insulating layer is preferably located inside the opening and overlaps the side surface of the fifth insulating layer and the upper surface of the third region. It is preferable that the gate electrode is located inside the opening and overlaps the side surface of the fifth insulating layer and the upper surface of the third region via the gate insulating layer.
- the display device of one aspect of the present invention preferably further includes a drive circuit.
- the drive circuit preferably has a circuit transistor.
- the circuit transistor preferably has a channel forming region on the semiconductor substrate.
- the transistor, the light emitting diode, the first conductive layer, the second conductive layer, the first insulating layer, and the second insulating layer are preferably located on the semiconductor substrate, respectively.
- the transistor preferably has a channel forming region on the semiconductor substrate.
- the semiconductor substrate is preferably a silicon substrate.
- the light emitting diode is preferably a micro light emitting diode. Further, the light emitting diode preferably has a compound containing a Group 13 element and a Group 15 element (also referred to as a Group III-V compound). Further, the light emitting diode preferably has gallium nitride.
- the display device of one aspect of the present invention preferably further has a functional layer.
- the functional layer is preferably located on the light emitting diode.
- the light emitted by the light emitting diode is preferably taken out of the display device via the functional layer.
- the functional layer preferably has one or both of a coloring layer and a color conversion layer.
- One aspect of the present invention is an electronic device having a display device having the above configuration, an optical member, a frame, and a housing, and the housing has a touch sensor.
- One aspect of the present invention is a display module having a display device having the above configuration.
- a connector such as a flexible printed circuit board (Flexible Printed Circuit, hereinafter referred to as FPC) or TCP (Tape Carrier Package) may be attached to the display module.
- FPC Flexible Printed Circuit
- TCP Transmission Carrier Package
- an integrated circuit IC may be mounted on the display module by a COG (Chip On Glass) method, a COF (Chip On Film) method, or the like.
- One aspect of the present invention is an electronic device having the above-mentioned display module and at least one of an antenna, a battery, a housing, a camera, a speaker, a microphone, and an operation button.
- a plurality of transistors are formed on a first substrate, and a plurality of first conductive layers electrically connected to at least one of the plurality of transistors are formed on the plurality of transistors. Then, a first insulating layer is formed on the plurality of transistors, and a conductive film, a first semiconductor film, a light emitter, a second semiconductor film, and a second insulating layer are formed on the second substrate. , In this order, by directly joining the first insulating layer and the second insulating layer, the first substrate and the second substrate are bonded together, and the second substrate is attached from the first substrate.
- a plurality of first electrodes, a plurality of first semiconductor layers, a plurality of light emitting layers, and A plurality of second semiconductor layers are formed in a matrix, and a plurality of openings each reaching at least one of the plurality of first conductive layers are formed in the second insulating layer, and at least one of the plurality of openings is formed.
- a plurality of second conductive layers located inside the one are formed, and are electrically connected to at least one of the plurality of second semiconductor layers and at least one of the plurality of second conductive layers, respectively.
- At least one flattening process in the step of forming a plurality of transistors.
- At least one of the plurality of light emitting diodes is preferably a micro light emitting diode.
- At least one of the plurality of transistors preferably has a metal oxide in the channel forming region.
- At least one of the plurality of transistors preferably has silicon in the channel forming region.
- At least one of a coloring layer, a color conversion layer, and a touch sensor is formed on a third substrate, and a third substrate is formed on a plurality of light emitting diodes. May be pasted together.
- At least one of a coloring layer, a color conversion layer, and a touch sensor may be formed on at least one of a plurality of light emitting diodes.
- a display device having high definition can be provided.
- a display device having a high resolution can be provided.
- a display device having low power consumption can be provided.
- a highly reliable display device can be provided.
- the manufacturing cost of a display device using a micro LED as a display device can be reduced.
- a display device using a micro LED as a display device can be manufactured with a high yield.
- FIG. 1 is a cross-sectional view showing an example of a display device.
- FIG. 2 is a cross-sectional view showing an example of a display device.
- 3A and 3B are cross-sectional views showing an example of a method for manufacturing a display device.
- FIG. 4 is a cross-sectional view showing an example of a method for manufacturing a display device.
- FIG. 5 is a cross-sectional view showing an example of a method for manufacturing a display device.
- 6A and 6B are cross-sectional views showing an example of a method for manufacturing a display device.
- 7A and 7B are cross-sectional views showing an example of a method for manufacturing a display device.
- FIG. 8 is a cross-sectional view showing an example of the display device.
- FIG. 8 is a cross-sectional view showing an example of the display device.
- 9A is a top view showing an example of a transistor.
- 9B to 9D are cross-sectional views showing an example of a transistor.
- FIG. 10 is a circuit diagram showing an example of pixels.
- 11A and 11B are diagrams showing an example of an electronic device.
- 12A and 12B are diagrams showing an example of an electronic device.
- 13A and 13B are diagrams showing an example of an electronic device.
- 14A to 14D are diagrams showing an example of an electronic device.
- 15A to 15F are diagrams showing an example of an electronic device.
- membrane and the word “layer” can be interchanged with each other in some cases or depending on the situation.
- conductive layer can be changed to the term “conductive layer”.
- insulating film can be changed to the term “insulating layer”.
- the display device of the present embodiment has a plurality of light emitting diodes as display devices and a plurality of transistors for driving the display devices.
- the plurality of light emitting diodes are provided in a matrix.
- Each of the plurality of transistors is electrically connected to at least one of the plurality of light emitting diodes.
- the laminated film is processed to separate elements.
- isolation By (also called isolation), a plurality of light emitting diodes are formed.
- the substrate on which the laminated film is formed and the substrate on which the transistor is formed are bonded to each other before the laminated film constituting the light emitting diode is processed.
- high alignment accuracy is not required. Therefore, even when a display device having a large number of pixels or a high-definition display device is manufactured, the difficulty of bonding can be reduced and the manufacturing yield of the display device can be increased.
- a plurality of transistors are formed in a matrix on a first substrate, and a first insulating layer and a plurality of first insulating layers are formed on the plurality of transistors.
- the conductive layer of is formed so that the height of the upper surface of the first insulating layer and the height of the upper surface of the first conductive layer match.
- the plurality of first conductive layers are each electrically connected to at least one of the plurality of transistors.
- a conductive film, a first semiconductor film, a light emitter, a second semiconductor film, and a second insulating layer are formed on the second substrate in this order.
- the first substrate and the second substrate are bonded together by directly joining the first insulating layer and the second insulating layer.
- the first insulating layer and the second insulating layer are preferably formed of the same material, and it is particularly preferable to use a silicon oxide film as the first insulating layer and the second insulating layer.
- a hydrophilic bond via a hydroxyl group (OH group) By forming a hydrophilic bond via a hydroxyl group (OH group), the bond strength between the first insulating layer and the second insulating layer can be increased.
- High alignment by bonding the first substrate and the second substrate before processing the conductive film, the first semiconductor film, the light emitting body, and the second semiconductor film (before separating the elements of the light emitting diode). Since accuracy is not required, the difficulty of bonding can be reduced, and the manufacturing yield of the display device can be increased.
- the second substrate is peeled off from the first substrate. Then, by processing the conductive film, the first semiconductor film, the light emitting body, and the second semiconductor film into a plurality of island-shaped patterns, the plurality of first electrodes and the plurality of first semiconductors are formed.
- the layer, the plurality of light emitting layers, and the plurality of second semiconductor layers are formed in a matrix.
- the first electrode, the first semiconductor layer, the light emitting layer, and the second semiconductor layer are layers constituting the light emitting diode, respectively.
- a plurality of openings are formed in the second insulating layer.
- the plurality of openings each reach at least one of the plurality of first conductive layers.
- a plurality of second conductive layers are formed. Each of the plurality of second conductive layers is located inside at least one of the plurality of openings. As a result, the first conductive layer and the second conductive layer are electrically connected to each other.
- a plurality of second electrodes are formed.
- the second electrode is electrically connected to the second semiconductor layer and the second conductive layer.
- a plurality of light emitting diodes having the first electrode, the first semiconductor layer, the light emitting layer, the second semiconductor layer, and the second electrode can be formed.
- the second electrode is preferably formed so as to be in contact with the upper surface of the second semiconductor layer and the upper surface of the second conductive layer.
- the second electrode is electrically connected to the transistor via the first conductive layer and the second conductive layer.
- each of the plurality of transistors is electrically connected to at least one of the plurality of light emitting diodes.
- the height of the surface of the first conductive layer on the side of the second conductive layer roughly coincides with the height of the surface of the first insulating layer on the side of the second insulating layer.
- “A and B roughly match” includes the case where A and B match, and when manufactured so that A and B match, in manufacturing. This includes the case where there is a difference between A and B due to an error.
- the display device of one aspect of the present invention preferably further has a third insulating layer and a fourth insulating layer.
- the third insulating layer is preferably located between the transistor and the first insulating layer.
- the fourth insulating layer is preferably located between the light emitting diode and the second insulating layer.
- As the third insulating layer and the fourth insulating layer it is preferable to use a film in which one or both of hydrogen and oxygen are less likely to diffuse than the first insulating layer and the second insulating layer.
- the third insulating layer and the fourth insulating layer preferably have at least one of an aluminum oxide film, a hafnium oxide film, and a silicon nitride film, respectively.
- the display device of the present embodiment has a function of displaying an image using a light emitting diode. Since the light emitting diode is a self-luminous device, when the light emitting diode is used as the display device, the display device does not need a backlight and does not need to be provided with a polarizing plate. Therefore, the power consumption of the display device can be reduced, and the display device can be made thinner and lighter. Further, a display device using a light emitting diode as the display device can be improved luminance (e.g., 5000 cd / m 2 or more, preferably 10000 cd / m 2 or more), and and, for the viewing angle is wide high contrast , High display quality can be obtained. Further, by using an inorganic material as the light emitting material, the life of the display device can be extended and the reliability can be improved.
- luminance e.g., 5000 cd / m 2 or more, preferably 10000 cd / m 2 or more
- the light emitting diode is not particularly limited, and for example, a micro LED having a quantum well junction, an LED using a nanocolumn, or the like may be used.
- Area of the region that emits light emitting diode is preferably 1 mm 2 or less, more preferably 10000 2 or less, more preferably 3000 .mu.m 2 or less, more preferably 700 .mu.m 2 or less.
- a light emitting diode having an area of a region for emitting light of 10,000 ⁇ m 2 or less may be referred to as a micro LED.
- the transistor included in the display device preferably has a metal oxide in the channel forming region.
- Transistors using metal oxides can reduce power consumption. Therefore, by combining with the micro LED, it is possible to realize a display device with extremely reduced power consumption.
- the display device of the present embodiment preferably has a transistor in which the height of the upper surface of the gate electrode is substantially the same as the height of the upper surface of the insulating layer.
- the upper surface of the gate electrode and the upper surface of the insulating layer are flattened, and the height of the upper surface of the gate electrode and the height of the upper surface of the insulating layer are made uniform. be able to.
- Transistors having such a configuration can easily be reduced in size. By reducing the size of the transistor, the size of the pixel can be reduced, so that the definition of the display device can be improved.
- the transistor included in the display device preferably has silicon in the channel forming region. This enables high-speed operation of the circuit.
- the display device may have both a transistor having silicon in the channel forming region and a transistor having a metal oxide in the channel forming region.
- a transistor having a metal oxide in the channel forming region may be used for the pixel circuit and the gate driver, and a transistor having silicon in the channel forming region may be used for the source driver.
- a transistor having a metal oxide in the channel forming region may be used for the pixel circuit, and a transistor having silicon in the channel forming region may be used for the source driver and the gate driver.
- transistors having silicon in the channel forming region may be used for all of the pixel circuit, the gate driver, and the source driver.
- a transistor having a metal oxide in the channel forming region may be used for all of the pixel circuit, the gate driver, and the source driver.
- the display device of the present embodiment can increase the definition, it can be suitably used for an electronic device having a relatively small display unit.
- electronic devices include wristwatch-type and bracelet-type information terminals (wearable devices).
- wearable devices are mounted on the head such as VR (Virtual Reality) devices such as head-mounted displays, glasses-type AR (Augmented Reality) devices, and MR (Mixed Reality) devices. Possible wearable devices and the like can be mentioned.
- FIG. 1 shows a cross-sectional view of the display device 100A.
- FIG. 2 shows a cross-sectional view of the display device 100B.
- 3 to 7 are cross-sectional views showing a method of manufacturing the display device 100A and the display device 100B.
- the configuration and manufacturing method of the display devices 100A and 100B will be described.
- the display device 100A and the display device 100B include transistors 130a and 130b having silicon in the channel forming region, transistors 120a and 120b having metal oxides in the channel forming region, and light emitting diodes 110a and 110b.
- the light emitting diode 110a has an electrode 112a, a semiconductor layer 113a, a light emitting layer 114a, a semiconductor layer 115a, and an electrode 117a.
- the light emitting diode 110b has an electrode 112b, a semiconductor layer 113b, a light emitting layer 114b, a semiconductor layer 115b, and an electrode 117c. Each layer of the light emitting diode may have a single layer structure or a laminated structure.
- the sub-pixels of each color have a light emitting diode that emits light of the same color.
- the sub-pixels of each color have a light emitting diode that exhibits blue light.
- a coloring layer CFR and a color conversion layer CCMR are provided in a region overlapping the light emitting diode 110a of the red sub-pixels.
- the color conversion layer CCMR has a function of converting blue light into red light.
- the light emitted by the light emitting diode 110a is converted from blue to red by the color conversion layer CCMR, the purity of the red light is increased by the colored layer CFR, and the light is emitted to the outside of the display device 100A or the display device 100B.
- a green coloring layer and a color conversion layer for converting blue light into green are provided in a region overlapping the light emitting diode of the green sub-pixel.
- the light emitted by the light emitting diode of the green sub-pixel is converted from blue to green by the color conversion layer, the purity of the green light is increased by the colored layer, and the outside of the display device 100A or the display device 100B is increased. Is ejected to.
- the color conversion layer is not provided in the region of the blue sub-pixels that overlaps with the light emitting diode 110b.
- the blue light emitted by the light emitting diode 110b is emitted to the outside of the display device 100A or the display device 100B without color conversion.
- a blue colored layer may be provided in a region overlapping the light emitting diode 110b of the blue pixels.
- the purity of blue light can be increased. Further, when the blue colored layer is not provided, the manufacturing process can be simplified.
- red light R and blue light B are extracted in the directions of the arrows shown in FIGS. 1 and 2.
- the display device 100A the light emitted by the light emitting diode 110a is taken out through the color conversion layer CCMR and the colored layer CFR formed on the light emitting diode 110a.
- the substrate 191 is bonded on the light emitting diode 110a, and the light emitted by the light emitting diode 110a is taken out through the color conversion layer CCMR and the coloring layer CFR formed on the substrate 191. ..
- the LED substrate 150A shown in FIG. 3A and the circuit board 150B shown in FIG. 3B are manufactured.
- FIG. 3A shows a cross-sectional view of the LED substrate 150A.
- the LED substrate 150A has a substrate 101, a semiconductor film 115, a light emitter 114, a semiconductor film 113, a conductive film 112, an insulating layer 103, and an insulating layer 104.
- the semiconductor film 115, the light emitting body 114, the semiconductor film 113, the conductive film 112, the insulating layer 103, and the insulating layer 104 may have a single-layer structure or a laminated structure, respectively.
- the LED substrate 150A may have an additional layer. For example, a base layer or the like may be provided between the substrate 101 and the semiconductor film 115.
- the conductive film 112, the semiconductor film 113, the light emitting body 114, and the semiconductor film 115 are films that are processed in a later step to form a light emitting diode.
- the light emitting body 114 is sandwiched between the semiconductor film 113 and the semiconductor film 115. In the light emitter 114, electrons and holes are combined to emit light.
- the semiconductor film 113 and the semiconductor film 115 one is an n-type semiconductor layer and the other is a p-type semiconductor layer.
- the laminated structure including the semiconductor film 113, the light emitting body 114, and the semiconductor film 115 is formed so as to exhibit light such as red, yellow, green, blue, and ultraviolet light.
- compounds containing Group 13 elements and Group 15 elements can be used.
- Group 13 elements include aluminum, gallium, and indium.
- Group 15 elements include nitrogen, phosphorus, arsenic, and antimony.
- gallium / phosphorus compound gallium / arsenide compound, gallium / aluminum / arsenic compound, aluminum / gallium / indium / phosphorus compound, gallium nitride (GaN), indium / gallium nitride compound, selenium / zinc compound, etc. are used to emit light.
- a diode can be made.
- a compound semiconductor substrate may be used, and for example, a compound semiconductor substrate containing a Group 13 element and a Group 15 element may be used. Further, as the substrate 101, for example, a single crystal substrate such as a sapphire (Al 2 O 3 ) substrate, a silicon carbide (SiC) substrate, a silicon (Si) substrate, or a gallium nitride (GaN) substrate can be used.
- a sapphire (Al 2 O 3 ) substrate a silicon carbide (SiC) substrate, a silicon (Si) substrate, or a gallium nitride (GaN) substrate.
- the conductive film 112 is a film that is processed in a later step and serves as an electrode of a light emitting diode.
- Materials that can be used for the conductive film 112 include, for example, metals such as aluminum, titanium, chromium, nickel, copper, yttrium, zirconium, tin, zinc, silver, platinum, gold, molybdenum, tantalum, or tungsten, or metals thereof.
- Ag-Pd-Cu (APC), etc. which is an alloy containing silver, palladium, and copper as a main component, and an oxide such as tin oxide or zinc oxide may be used.
- the insulating layer 103 and the insulating layer 104 can be formed by using various inorganic insulating materials such as silicon oxide, silicon nitride nitride, silicon nitride oxide, silicon nitride, aluminum oxide, hafnium oxide, and titanium nitride.
- silicon oxide nitriding has a higher oxygen content than nitrogen as its composition.
- silicon nitride oxide has a higher nitrogen content than oxygen in its composition.
- the insulating layer 103 it is preferable to use a film such as an aluminum oxide film, a hafnium oxide film, or a silicon nitride film, in which one or both of hydrogen and oxygen are less likely to diffuse than the silicon oxide film.
- the insulating layer 103 preferably functions as a barrier layer that prevents impurities from diffusing from the LED substrate 150A to the circuit board 150B.
- the insulating layer 104 is a layer that is directly bonded to the insulating layer of the circuit board 150B. By directly bonding the oxide insulating films to each other, the bonding strength (bonding strength) can be increased.
- the display device of the present embodiment may have a light emitting diode that exhibits infrared light.
- a light emitting diode exhibiting infrared light can be used, for example, as a light source of an infrared light sensor.
- FIG. 3B shows a cross-sectional view of the circuit board 150B.
- the circuit board 150B has a transistor (transistors 130a, 130b) having a channel forming region on the substrate 131 and a transistor (transistors 120a, 120b) having a channel forming region on a metal oxide laminated.
- Each layer of the circuit board 150B may have a single-layer structure or a laminated structure.
- the transistors 130a and 130b have a conductive layer 135, an insulating layer 134, an insulating layer 136, and a pair of low resistance regions 133.
- the conductive layer 135 functions as a gate.
- the insulating layer 134 is located between the conductive layer 135 and the substrate 131, and functions as a gate insulating layer.
- the insulating layer 136 is provided so as to cover the side surface of the conductive layer 135 and functions as a sidewall.
- the pair of low resistance regions 133 are impurities-doped regions in the substrate 131, one of which functions as a transistor source and the other of which functions as a transistor drain.
- an element separation layer 132 is provided between two adjacent transistors so as to be embedded in the substrate 131.
- An insulating layer 139 is provided so as to cover the transistors 130a and 130b, and a conductive layer 138 is provided on the insulating layer 139.
- the conductive layer 138 is electrically connected to one of the pair of low resistance regions 133 via the conductive layer 137 embedded in the opening of the insulating layer 139.
- the insulating layer 141 is provided so as to cover the conductive layer 138, and the conductive layer 142 is provided on the insulating layer 141.
- the conductive layer 138 and the conductive layer 142 each function as wiring.
- an insulating layer 143 and an insulating layer 152 are provided so as to cover the conductive layer 142, and transistors 120a and 120b are provided on the insulating layer 152.
- At least one of the insulating layers (insulating layer 139, insulating layer 141, insulating layer 143, and insulating layer 152 in FIG. 3B) provided between the transistors 130a and 130b and the transistors 120a and 120b is used as a barrier layer. It is preferable to use a functional layer.
- the barrier layer for example, it is preferable to use a film such as an aluminum oxide film, a hafnium oxide film, or a silicon nitride film, in which one or both of hydrogen and oxygen are less likely to diffuse than the silicon oxide film.
- the insulating layer 152 functions as a barrier layer is shown.
- the insulating layer 152 is a barrier that prevents one or both of water and hydrogen from diffusing from the transistors 130a and 130b to the transistors 120a and 120b and desorbing oxygen from the transistors 120a and 120b to the transistors 130a and 130b. Acts as a layer.
- the transistors 120a and 120b include a conductive layer 161, an insulating layer 163, an insulating layer 164, a metal oxide layer 165, a pair of conductive layers 166, an insulating layer 167, a conductive layer 168, and the like.
- One or more of the insulating layers such as the insulating layer 162, the insulating layer 181 and the insulating layer 182, the insulating layer 183, and the insulating layer 185 may be regarded as components of the transistor, but in the present embodiment, the transistor is used. It will be explained without including it in the components of. A specific example of a transistor that can be used in the display device of one aspect of the present invention will be described in detail in the second embodiment.
- the metal oxide layer 165 has a channel forming region.
- the metal oxide layer 165 has a first region that overlaps with one of the pair of conductive layers 166, a second region that overlaps with the other of the pair of conductive layers 166, and between the first region and the second region. It has a third region of.
- a conductive layer 161 and an insulating layer 162 are provided on the insulating layer 152, and an insulating layer 163 and an insulating layer 164 are provided so as to cover the conductive layer 161 and the insulating layer 162.
- the metal oxide layer 165 is provided on the insulating layer 164.
- the conductive layer 161 functions as a gate electrode, and the insulating layer 163 and the insulating layer 164 function as a gate insulating layer.
- the conductive layer 161 overlaps with the metal oxide layer 165 via the insulating layer 163 and the insulating layer 164.
- the insulating layer 163 preferably functions as a barrier layer like the insulating layer 152. It is preferable to use an oxide insulating film such as a silicon oxide film for the insulating layer 164 in contact with the metal oxide layer 165.
- the height of the upper surface of the conductive layer 161 is substantially the same as the height of the upper surface of the insulating layer 162. Thereby, the size of the transistors 120a and 120b can be reduced.
- At least one configuration in which the height of the upper surface of the insulating layer and the height of the upper surface of the conductive layer are substantially the same is applied to the display device of the present embodiment.
- a method for producing the configuration first, an insulating layer is formed, an opening is provided in the insulating layer, a conductive layer is formed so as to fill the opening, and then a flattening treatment is performed by using a CMP method or the like. Can be mentioned.
- the height of the upper surface of the conductive layer and the height of the upper surface of the insulating layer can be made uniform.
- the pair of conductive layers 166 are provided on the metal oxide layer 165 at intervals.
- the pair of conductive layers 166 functions as a source and a drain.
- An insulating layer 181 is provided so as to cover the metal oxide layer 165 and the pair of conductive layers 166, and an insulating layer 182 is provided on the insulating layer 181.
- the insulating layer 181 and the insulating layer 182 are provided with an opening reaching the metal oxide layer 165, and the insulating layer 167 and the conductive layer 168 are embedded inside the opening. The opening overlaps the third region.
- the insulating layer 167 overlaps the side surface of the insulating layer 181 and the side surface of the insulating layer 182.
- the conductive layer 168 overlaps the side surface of the insulating layer 181 and the side surface of the insulating layer 182 via the insulating layer 167.
- the conductive layer 168 functions as a gate electrode, and the insulating layer 167 functions as a gate insulating layer.
- the conductive layer 168 overlaps with the metal oxide layer 165 via the insulating layer 167.
- the height of the upper surface of the conductive layer 168 is substantially the same as the height of the upper surface of the insulating layer 182. Thereby, the size of the transistors 120a and 120b can be reduced.
- the insulating layer 183 and the insulating layer 185 are provided so as to cover the upper surfaces of the insulating layer 182, the insulating layer 167, and the conductive layer 168.
- the insulating layer 181 and the insulating layer 183 preferably function as a barrier layer in the same manner as the insulating layer 152.
- One of the pair of conductive layers 166 and a plug electrically connected to the conductive layer 189a are embedded in openings provided in the insulating layer 181, the insulating layer 182, the insulating layer 183, and the insulating layer 185.
- the plug preferably has a conductive layer 184b in contact with the side surface of the opening and one upper surface of the pair of conductive layers 166, and a conductive layer 184a embedded inside the conductive layer 184b.
- the conductive layer 184b it is preferable to use a conductive material in which hydrogen and oxygen are difficult to diffuse.
- a conductive layer 189a and an insulating layer 186 are provided on the insulating layer 185, a conductive layer 189b is provided on the conductive layer 189a, and an insulating layer 187 is provided on the insulating layer 186.
- An insulating layer 188, a conductive layer 190a, a conductive layer 190b, a conductive layer 190c, and a conductive layer 190d are provided on the insulating layer 187.
- the insulating layer 186 preferably has a flattening function.
- the height of the upper surface of the conductive layer 189b substantially coincides with the height of the upper surface of the insulating layer 187.
- the insulating layer 187 and the insulating layer 186 are provided with an opening reaching the conductive layer 189a, and the conductive layer 189b is embedded inside the opening.
- the conductive layer 189b functions as a plug that electrically connects the conductive layer 189a and the conductive layer 190a or the conductive layer 190c.
- the height of the upper surface of the insulating layer 188 is substantially the same as the height of the upper surfaces of the conductive layer 190a, the conductive layer 190b, the conductive layer 190c, and the conductive layer 190d.
- One of the pair of conductive layers 166 of the transistor 120a is electrically connected to the conductive layer 190a via the conductive layer 184a, the conductive layer 184b, the conductive layer 189a, and the conductive layer 189b.
- one of the pair of conductive layers 166 of the transistor 120b is electrically connected to the conductive layer 190c via the conductive layer 184a, the conductive layer 184b, the conductive layer 189a, and the conductive layer 189b.
- the insulating layer 186 is preferably formed by using an inorganic insulating material such as silicon oxide, silicon nitride nitride, silicon nitride oxide, silicon nitride, aluminum oxide, hafnium oxide, and titanium nitride.
- an inorganic insulating material such as silicon oxide, silicon nitride nitride, silicon nitride oxide, silicon nitride, aluminum oxide, hafnium oxide, and titanium nitride.
- the insulating layer 187 for example, a film such as an aluminum oxide film, a hafnium oxide film, or a silicon nitride film, in which one or both of hydrogen and oxygen are less likely to diffuse than the silicon oxide film can be used.
- the insulating layer 187 preferably functions as a barrier layer that prevents impurities (hydrogen, water, etc.) from diffusing from the LED substrate 150A to the transistor. Further, the insulating layer 187 preferably functions as a barrier layer for preventing impurities from diffusing from the circuit board 150B to the LED board 150A.
- the insulating layer 188 is a layer that is directly bonded to the insulating layer 104 of the LED substrate 150A.
- the insulating layer 188 is preferably formed of the same material as the insulating layer 104. It is preferable to use an oxide insulating film for the insulating layer 188. By directly bonding the oxide insulating films to each other, the bonding strength (bonding strength) can be increased.
- the layers in contact with each other (layer including the surface layer and the bonding surface) are formed of the same material.
- Examples of materials that can be used for various conductive layers of the circuit board 150B include aluminum, titanium, chromium, nickel, copper, yttrium, zirconium, tin, zinc, silver, platinum, gold, molybdenum, tantalum, and tungsten. Examples of the metal or an alloy containing the same as a main component (APC, etc.). Further, an oxide such as tin oxide or zinc oxide may be used.
- the circuit board 150B may have one or both of a reflection layer that reflects the light of the light emitting diode and a light shielding layer that blocks the light.
- the transistors 120a and 120b can be used as transistors constituting a pixel circuit. Further, the transistors 130a and 130b can be used as a transistor constituting a pixel circuit or a transistor constituting a drive circuit (one or both of a gate driver and a source driver) for driving the pixel circuit. Further, the transistors 120a, 120b, 130a and 130b can be used as transistors constituting various circuits such as an arithmetic circuit and a storage circuit.
- a pixel circuit not only a pixel circuit but also a drive circuit and the like can be formed directly under the light emitting diode, so that the display device can be downsized as compared with the case where the drive circuit is provided outside the display unit. be able to. Further, it is possible to realize a display device having a narrow frame (narrow non-display area).
- the LED substrate 150A and the circuit board 150B are bonded together.
- the insulating layer 104 provided on the LED substrate 150A and the insulating layer 188 provided on the circuit board 150B are directly bonded.
- the insulating layer 104 and the insulating layer 188 are preferably composed of the same components.
- the surfaces treated with hydrophilicity such as oxygen plasma are brought into contact with each other for temporary bonding, and then main bonding is performed by dehydration by heat treatment. Etc. can be used. Since the hydrophilic bonding method also causes bonding at the atomic level, it is possible to obtain mechanically excellent bonding.
- an oxide insulating film it is preferable to carry out a hydrophilic treatment because the bonding strength can be further increased. When an oxide insulating film is used, it is not necessary to separately perform hydrophilic treatment.
- the LED substrate 150A is bonded to the circuit board 150B in a state where the film constituting the light emitting diode is formed but the processing such as patterning is not performed. .. Therefore, high alignment accuracy is not required, and the difficulty of bonding can be reduced. As a result, the production yield can be increased even in a display device having high definition and resolution.
- the substrate 101 is peeled off (FIGS. 5 and 6A).
- the method of peeling the substrate 101 is not limited, and for example, as shown in FIG. 5, a method of irradiating the entire surface of the substrate 101 with a laser beam (Laser beam) can be mentioned. As a result, the substrate 101 can be peeled off to expose the semiconductor film 115 (FIG. 6A).
- a laser beam Laser beam
- an excimer laser a solid-state laser, or the like can be used.
- a diode-pumped solid-state laser DPSS
- DPSS diode-pumped solid-state laser
- a release layer may be provided between the substrate 101 and the light emitting diode (in FIG. 6A, between the substrate 101 and the semiconductor film 115).
- the release layer can be formed using an organic material or an inorganic material.
- organic material examples include polyimide resin, acrylic resin, epoxy resin, polyamide resin, polyimideamide resin, siloxane resin, benzocyclobutene resin, and phenol resin.
- Examples of the inorganic material that can be used for the release layer include metals containing elements selected from tungsten, molybdenum, titanium, tantalum, niobium, nickel, cobalt, zirconium, zinc, ruthenium, rhodium, palladium, osmium, iridium, and silicon. Examples thereof include an alloy containing the element, a compound containing the element, and the like.
- the crystal structure of the layer containing silicon may be amorphous, microcrystal, or polycrystalline.
- the conductive film 112, the semiconductor film 113, the light emitting body 114, and the semiconductor film 115 are processed, and the electrodes 112a, the electrodes 112b, the semiconductor layer 113a, the semiconductor layer 113b, the light emitting layer 114a, and the light emitting light are processed.
- the layer 114b, the semiconductor layer 115a, and the semiconductor layer 115b are formed.
- the insulating layer 102 is formed on the insulating layer 103.
- the height of the upper surface of the insulating layer 102 substantially coincides with the height of the upper surfaces of the semiconductor layers 115a and 115b.
- the insulating layer 102 is preferably formed by using an inorganic insulating material such as silicon oxide, silicon nitride nitride, silicon nitride, silicon nitride, aluminum oxide, hafnium oxide, and titanium nitride. Further, it is preferable that the insulating layer 102 has a function of blocking visible light. Since the insulating layer 102 has a function of blocking visible light, it is possible to suppress the light emitted by the light emitting diode from reaching the adjacent sub-pixels and improve the display quality of the display device.
- an inorganic insulating material such as silicon oxide, silicon nitride nitride, silicon nitride, silicon nitride, aluminum oxide, hafnium oxide, and titanium nitride. Further, it is preferable that the insulating layer 102 has a function of blocking visible light. Since the insulating layer 102 has a function of blocking visible light, it is possible to suppress the light emitted by
- the insulating layer 102 is provided with openings reaching each of the conductive layer 190a, the conductive layer 190b, the conductive layer 190c, the electrode 112a, and the electrode 112b. Although not shown, the insulating layer 102 is also provided with an opening reaching the conductive layer 190d.
- the conductive layer 116a, the conductive layer 116b, the conductive layer 116c, the conductive layer 116d, and the conductive layer 116e are formed so as to fill these openings.
- the opening reaching the conductive layer 190d is also filled with the conductive layer.
- Materials that can be used for the conductive layer 116a to 116d include, for example, aluminum, titanium, chromium, nickel, copper, yttrium, zirconium, tin, zinc, silver, platinum, gold, molybdenum, tantalum, and tungsten. Examples thereof include metal and alloys containing this as a main component (APC and the like). Further, an oxide such as tin oxide or zinc oxide may be used.
- the electrode 117a, the conductive layer 117b, the electrode 117c, and the conductive layer 117d are formed on the insulating layer 102.
- the light emitting diode 110a having the electrode 112a, the semiconductor layer 113a, the light emitting layer 114a, the semiconductor layer 115a, and the electrode 117a can be formed. Further, a light emitting diode 110b having an electrode 112b, a semiconductor layer 113b, a light emitting layer 114b, a semiconductor layer 115b, and an electrode 117c can be formed.
- the electrode 117a electrically connects the semiconductor layer 115a and the conductive layer 116a.
- the electrode 117a is electrically connected to the conductive layer 190a via the conductive layer 116a.
- the transistor 120a and the light emitting diode 110a can be electrically connected.
- the electrode 117a functions as a pixel electrode of the light emitting diode 110a.
- the electrode 117a is preferably formed so as to be in contact with the upper surface of the semiconductor layer 115a and the upper surface of the conductive layer 116a.
- the conductive layer 117b is electrically connected to the electrode 112a via the conductive layer 116b, and is electrically connected to the conductive layer 190b via the conductive layer 116c.
- the electrode 112a is electrically connected to the conductive layer 190b via the conductive layer 116b, the conductive layer 117b, and the conductive layer 116c.
- the electrode 112b functions as a common electrode of the light emitting diode 110a.
- the electrode 117c electrically connects the semiconductor layer 115b and the conductive layer 116d.
- the electrode 117c is electrically connected to the conductive layer 190c via the conductive layer 116d.
- the transistor 120b and the light emitting diode 110b can be electrically connected.
- the electrode 117c functions as a pixel electrode of the light emitting diode 110b.
- the electrode 117c is preferably formed so as to be in contact with the upper surface of the semiconductor layer 115b and the upper surface of the conductive layer 116d.
- the conductive layer 117d is electrically connected to the electrode 112b via the conductive layer 116e, and is electrically connected to the conductive layer 190d via the conductive layer (not shown).
- the electrode 112b is electrically connected to the conductive layer 190d via the conductive layer 116e, the conductive layer 117d, and the like.
- the electrode 112b functions as a common electrode of the light emitting diode 110b.
- the insulating layer 102 may be provided with an opening surrounding the light emitting diode, and the light-shielding layer BM may be embedded in the opening.
- the material of the light-shielding layer BM is not particularly limited, and for example, an inorganic material such as a metal material or an organic material such as a resin material containing a pigment (carbon black or the like) or a dye can be used.
- the color conversion layer CCMR and the colored layer CFR are formed in the region overlapping with the light emitting diode 110a. Further, a blue colored layer may be formed in a region overlapping the light emitting diode 110b.
- the color conversion layer CCMR is formed on the light emitting diode 110a, and the colored layer CFR is formed on the color conversion layer CCMR.
- the color conversion layer CCMR may be formed directly on the light emitting diode 110a. Further, as shown in FIG. 1, an insulating layer may be formed on the light emitting diode 110a, and a color conversion layer CCMR may be formed on the insulating layer.
- FIG. 1 shows an example in which an insulating layer 193 is formed on an insulating layer 102, and an insulating layer 194 is formed on an electrode 117a, a conductive layer 117b, an electrode 117c, a conductive layer 117d, and an insulating layer 193.
- Various insulating materials can be used for the insulating layer 193 and the insulating layer 194, respectively.
- the insulating layer provided between the light emitting diode 110a and the color conversion layer CCMR is at least a film such as an aluminum oxide film, a hafnium oxide film, or a silicon nitride film in which one or both of hydrogen and oxygen are less likely to diffuse than the silicon oxide film. It is preferable to have one layer.
- FIG. 1 shows an example in which an insulating layer 193 is formed on an insulating layer 102, and an insulating layer 194 is formed on an electrode 117a, a conductive layer 117b, an electrode 117c, a
- FIG. 1 shows an example in which an oxide insulating film (silicon oxide film or the like) is used for the insulating layer 193, and a film in which one or both of hydrogen and oxygen are less likely to diffuse than the silicon oxide film is used for the insulating layer 194.
- oxide insulating film silicon oxide film or the like
- the formation surface of the color conversion layer CCMR is preferably flat.
- FIG. 1 shows an example in which the upper surfaces of the electrodes 117a, the conductive layer 117b, the electrodes 117c, and the conductive layer 117d are substantially aligned with the upper surface of the insulating layer 193.
- quantum dots have a narrow peak width in the emission spectrum, and can obtain emission with good color purity. Thereby, the display quality of the display device can be improved.
- the color conversion layer can be formed by using a droplet ejection method (for example, an inkjet method), a coating method, an imprint method, various printing methods (screen printing, offset printing), or the like. Further, a color conversion film such as a quantum dot film may be used.
- a droplet ejection method for example, an inkjet method
- a coating method for example, an imprint method
- various printing methods screen printing, offset printing
- a color conversion film such as a quantum dot film may be used.
- the material constituting the quantum dot is not particularly limited, and for example, it belongs to a group 14 element, a group 15 element, a group 16 element, a compound composed of a plurality of group 14 elements, and groups 4 to 14.
- quantum dots examples include a core type, a core-shell type, and a core-multishell type.
- a protective agent is attached or a protecting group is provided on the surface of the quantum dots. By the attachment of the protective agent or the provision of the protecting group, aggregation can be prevented and the solubility in a solvent can be enhanced. It is also possible to reduce reactivity and improve electrical stability.
- the size of the quantum dots is appropriately adjusted so that light having a desired wavelength can be obtained.
- the emission of the quantum dots shifts to the blue side, that is, to the high energy side. Therefore, by changing the size of the quantum dots, the wavelengths of the spectra in the ultraviolet region, visible region, and infrared region are used. The emission wavelength can be adjusted over the region.
- the size (diameter) of the quantum dots is, for example, 0.5 nm or more and 20 nm or less, preferably 1 nm or more and 10 nm or less.
- the narrower the size distribution of the quantum dots the narrower the emission spectrum becomes, and the better the color purity of the quantum dots can be obtained.
- the shape of the quantum dot is not particularly limited, and may be spherical, rod-shaped, disk-shaped, or other shape.
- a quantum rod, which is a rod-shaped quantum dot has a function of exhibiting directional light.
- the colored layer is a colored layer that transmits light in a specific wavelength range.
- a color filter that transmits light in the red, green, blue, or yellow wavelength range can be used.
- the material that can be used for the colored layer include a metal material, a resin material, a resin material containing a pigment or a dye, and the like.
- a substrate 191 provided with the coloring layer CFR and the color conversion layer CCMR is prepared.
- the substrate 191 Since the substrate 191 is located on the side from which the light from the light emitting diode is taken out, it is preferable to use a material having high transparency to visible light. Examples of the material that can be used for the substrate 191 include glass, quartz, sapphire, and resin. A film such as a resin film may be used for the substrate 191. This makes it possible to reduce the weight and thickness of the display device.
- the substrate 191 is bonded using the adhesive layer 192 so that the colored layer CFR and the color conversion layer CCMR overlap with the light emitting diode 110a. Thereby, the display device 100B can be manufactured.
- various curable adhesives such as a photocurable adhesive such as an ultraviolet curable type, a reaction curable type adhesive, a thermosetting type adhesive, and an anaerobic type adhesive can be used. Moreover, you may use an adhesive sheet or the like.
- FIG. 2 shows an example in which the adhesive layer 192 is in contact with the insulating layer 102 and the electrode 117a
- the insulating layer (for example, the insulating layer 193 and the insulating layer 193 shown in FIG. 1) is attached to one or both of the insulating layer 102 and the electrode 117a.
- One or both of the insulating layers 194) may be provided, and the insulating layer and the adhesive layer 192 may be in contact with each other.
- a plurality of light emitting diodes may be electrically connected to one transistor.
- At least one of the size, channel length, channel width, structure, and the like of the transistor driving the light emitting diode may be different from each other for each color exhibited by the sub-pixel.
- one or both of the channel length and the channel width of the transistor may be changed for each color according to the amount of current required to emit light with a desired brightness.
- the display device of one aspect of the present invention may be a display device (also referred to as an input / output device or a touch panel) equipped with a touch sensor.
- the detection device (also referred to as a sensor device, a detection element, or a sensor element) included in the touch panel of one aspect of the present invention is not limited.
- Various sensors capable of detecting the proximity or contact of the object to be detected such as a finger and a stylus can be applied as a detection device.
- various methods such as a capacitance method, a resistance film method, a surface acoustic wave method, an infrared method, an optical method, and a pressure sensitive method can be used.
- the capacitance method there are a surface type capacitance method, a projection type capacitance method and the like. Further, as the projection type capacitance method, there are a self-capacitance method, a mutual capacitance method and the like. It is preferable to use the mutual capacitance method because simultaneous multipoint detection is possible.
- the touch panel of one aspect of the present invention has a configuration in which a separately manufactured display device and a detection device are bonded together, a configuration in which electrodes or the like constituting the detection device are provided on one or both of a substrate supporting the display device and a facing substrate, and the like. , Various configurations can be applied.
- Display device configuration example 2 The display device 100C shown in FIG. 8 differs from the display device 100A shown in FIG. 1 mainly in that it does not have transistors 120a and 120b.
- a pixel circuit is formed by using transistors (transistors 130a and 130b) having a channel forming region on the substrate 131. Further, using a transistor having a channel forming region on the substrate 131, various circuits such as a drive circuit (one or both of a gate driver and a source driver) for driving the pixel circuit, an arithmetic circuit, and a storage circuit are formed. May be good.
- the display device 100C can be manufactured by the same method as the display device 100A except that the configuration of the circuit board to be manufactured is different.
- the configuration of the circuit board will be described below.
- the configuration from the substrate 131 to the conductive layer 138 is the same as the configuration of the circuit board 150B (FIG. 3B). Further, an insulating layer 186 is provided on the conductive layer 138, a conductive layer 189 is provided on the conductive layer 138, and an insulating layer 187 is provided on the insulating layer 186. An insulating layer 188, a conductive layer 190a, a conductive layer 190b, a conductive layer 190c, and a conductive layer 190d are provided on the insulating layer 187.
- the insulating layer 186 preferably has a flattening function.
- the height of the upper surface of the conductive layer 189 is substantially the same as the height of the upper surface of the insulating layer 187.
- the insulating layer 187 and the insulating layer 186 are provided with an opening reaching the conductive layer 138, and the conductive layer 189 is embedded inside the opening.
- the conductive layer 189 functions as a plug that electrically connects the conductive layer 138 and the conductive layer 190a or the conductive layer 190c.
- the height of the upper surface of the insulating layer 188 is substantially the same as the height of the upper surfaces of the conductive layer 190a, the conductive layer 190b, the conductive layer 190c, and the conductive layer 190d.
- the substrate on which the laminated film is formed and the substrate on which the transistor is formed are bonded to each other. At the time, high alignment accuracy is not required. Therefore, even when a display device having a large number of pixels or a high-definition display device is manufactured, the difficulty of bonding can be reduced and the manufacturing yield of the display device can be increased.
- a film of the same material is formed on the first insulating layer on a plurality of transistors and the second insulating layer on the laminated film constituting the light emitting diode.
- a film, more preferably a silicon oxide film is used.
- the third insulating layer and the fourth insulating layer a film in which one or both of hydrogen and oxygen are less likely to diffuse than the first insulating layer and the second insulating layer is used.
- the third insulating layer and the fourth insulating layer it is preferable to use at least one of an aluminum oxide film, a hafnium oxide film, and a silicon nitride film, and it is particularly preferable to use a silicon nitride film. preferable.
- impurities entering the transistor and the light emitting diode can be suitably suppressed.
- the display device of the present embodiment can reduce the size of the transistor, it is easy to increase the definition and to apply it to an electronic device having a relatively small display unit.
- the structure of the transistor included in the display device is not particularly limited. For example, it may be a planar type transistor, a stagger type transistor, or an inverted stagger type transistor. Further, a transistor structure having either a top gate structure or a bottom gate structure may be used. Alternatively, gate electrodes may be provided above and below the channel.
- the transistor included in the display device for example, a transistor using a metal oxide in the channel forming region can be used. As a result, a transistor having an extremely small off-current can be realized.
- a transistor having silicon in the channel forming region may be applied to the transistor included in the display device.
- the transistor include a transistor having amorphous silicon, a transistor having crystalline silicon (typically, low-temperature polysilicon), and a transistor having single crystal silicon.
- a transistor using a metal oxide in the channel forming region and a transistor having silicon in the channel forming region may be used in combination.
- the transistor is an element having at least three terminals including a gate, a drain, and a source. Then, it has a region (hereinafter, also referred to as a channel forming region) in which a channel is formed between the drain (drain terminal, drain region, or drain electrode) and the source (source terminal, source region, or source electrode). It is possible to pass a current between the source and the drain through the channel forming region.
- the channel forming region means a region in which a current mainly flows.
- the functions of the source and the drain may be interchanged when transistors having different polarities are adopted or when the direction of the current changes in the circuit operation. Therefore, in the present specification and the like, the terms source and drain may be used interchangeably.
- the channel length is, for example, the source in the top view of the transistor, the region where the semiconductor (or the portion where the current flows in the semiconductor when the transistor is on) and the gate electrode overlap each other, or the channel formation region.
- the channel length does not always take the same value in all regions. That is, the channel length of one transistor may not be fixed to one value. Therefore, in the present specification, the channel length is set to any one value, the maximum value, the minimum value, or the average value in the channel formation region.
- the channel width is, for example, the channel length direction in the region where the semiconductor (or the portion where the current flows in the semiconductor when the transistor is on) and the gate electrode overlap each other in the top view of the transistor, or in the channel formation region. Refers to the length of the channel formation region in the vertical direction with reference to. In one transistor, the channel width does not always take the same value in all regions. That is, the channel width of one transistor may not be fixed to one value. Therefore, in the present specification, the channel width is set to any one value, the maximum value, the minimum value, or the average value in the channel formation region.
- the channel width in the region where the channel is actually formed (hereinafter, also referred to as “effective channel width”) and the channel width shown in the top view of the transistor. (Hereinafter, also referred to as “apparent channel width”) and may be different.
- the effective channel width may be larger than the apparent channel width, and the influence thereof may not be negligible.
- the proportion of the channel forming region formed on the side surface of the semiconductor may be large. In that case, the effective channel width is larger than the apparent channel width.
- channel width may refer to an apparent channel width.
- channel width may refer to an effective channel width.
- the values of the channel length, channel width, effective channel width, apparent channel width, and the like can be determined by analyzing a cross-sectional TEM (Transmission Electron Microscope) image or the like.
- insulator can be paraphrased as an insulating film or an insulating layer.
- conductor can be rephrased as a conductive film or a conductive layer.
- oxide can be paraphrased as an oxide film or an oxide layer.
- semiconductor can be paraphrased as a semiconductor film or a semiconductor layer.
- FIG. 9A shows a top view of the transistor 200. In FIG. 9A, some elements are not shown for the sake of clarity.
- FIG. 9B shows a cross-sectional view between the alternate long and short dash lines A1-A2 in FIG. 9A.
- FIG. 9B can be said to be a cross-sectional view of the transistor 200 in the channel length direction.
- FIG. 9C shows a cross-sectional view between the alternate long and short dash lines A3-A4 in FIG. 9A.
- FIG. 9C can be said to be a cross-sectional view of the transistor 200 in the channel width direction.
- FIG. 9D shows a cross-sectional view between the alternate long and short dash lines A5-A6 in FIG. 9A.
- the semiconductor devices shown in FIGS. 9A to 9D include an insulator 212 on a substrate (not shown), an insulator 214 on the insulator 212, a transistor 200 on the insulator 214, and an insulator 280 on the transistor 200. And an insulator 282 on the insulator 280, an insulator 283 on the insulator 282, and an insulator 285 on the insulator 283.
- the insulator 212, the insulator 214, the insulator 280, the insulator 282, the insulator 283, and the insulator 285 function as an interlayer insulating film.
- conductor 240 (conductor 240a and conductor 240b) that is electrically connected to the transistor 200 and functions as a plug.
- An insulator 241 (insulator 241a and insulator 241b) is provided in contact with the side surface of the conductor 240 that functions as a plug.
- a conductor 246 (conductor 246a and a conductor 246b) that is electrically connected to the conductor 240 and functions as wiring is provided.
- the insulator 241a is provided in contact with the inner wall of the opening of the insulator 280, the insulator 282, the insulator 283, and the insulator 285, and the first conductor of the conductor 240a is provided in contact with the side surface of the insulator 241a. Further, a second conductor of the conductor 240a is provided inside. Further, the insulator 241b is provided in contact with the inner wall of the opening of the insulator 280, the insulator 282, and the insulator 283, and the first conductor of the conductor 240b is provided in contact with the side surface of the insulator 241b. A second conductor of the conductor 240b is provided inside.
- the height of the upper surface of the conductor 240 and the height of the upper surface of the insulator 285 in the region overlapping the conductor 246 can be made about the same.
- the conductor 240 may be provided as a single layer or a laminated structure having three or more layers. When the structure has a laminated structure, an ordinal number may be given in the order of formation to distinguish them.
- the transistor 200 includes an insulator 216 on the insulator 214 and a conductor 205 (conductor 205a, conductor 205b, and conductor 205) arranged so as to be embedded in the insulator 216. 205c), the insulator 222 on the insulator 216 and the conductor 205, the insulator 224 on the insulator 222, the oxide 230a on the insulator 224, and the oxide 230b on the oxide 230a.
- Oxide 243 (oxide 243a and oxide 243b) on oxide 230b, conductor 242a on oxide 243a, insulator 271a on conductor 242a, conductor 242b on oxide 243b, and conductivity.
- Insulator 275 which is arranged in the above.
- the oxide 230a and the oxide 230b may be collectively referred to as the oxide 230.
- the conductor 242a and the conductor 242b may be collectively referred to as a conductor 242.
- the insulator 271a and the insulator 271b may be collectively referred to as an insulator 271.
- the insulator 280 and the insulator 275 are provided with an opening reaching the oxide 230b.
- An insulator 250 and a conductor 260 are arranged in the opening. Further, in the channel length direction of the transistor 200, the conductor 260 and the insulator 250 are provided between the insulator 271a, the conductor 242a, and the oxide 243a, and the insulator 271b, the conductor 242b, and the oxide 243b. Has been done.
- the insulator 250 has a region in contact with the side surface of the conductor 260 and a region in contact with the bottom surface of the conductor 260.
- the oxide 230 preferably has an oxide 230a arranged on the insulator 224 and an oxide 230b arranged on the oxide 230a.
- the oxide 230a By having the oxide 230a under the oxide 230b, it is possible to suppress the diffusion of impurities into the oxide 230b from the structure formed below the oxide 230a.
- the transistor 200 shows a configuration in which the oxide 230 is laminated with two layers of the oxide 230a and the oxide 230b, but the present invention is not limited to this.
- a single layer of the oxide 230b or a laminated structure of three or more layers may be provided, or each of the oxide 230a and the oxide 230b may have a laminated structure.
- the conductor 260 functions as a first gate (also referred to as a top gate) electrode, and the conductor 205 functions as a second gate (also referred to as a back gate) electrode.
- the insulator 250 functions as a first gate insulating film, and the insulator 224 and the insulator 222 function as a second gate insulating film.
- the conductor 242a functions as one of the source electrode and the drain electrode, and the conductor 242b functions as the other of the source electrode and the drain electrode.
- at least a part of the region of the oxide 230 that overlaps with the conductor 260 functions as a channel forming region.
- the oxide 230b has one of the source region and the drain region in the region superimposing on the conductor 242a, and has the other of the source region and the drain region in the region superimposing on the conductor 242b. Further, the oxide 230b has a channel forming region (a region shown by a shaded portion in FIG. 9B) in a region sandwiched between the source region and the drain region.
- the channel formation region is a high resistance region having a low carrier concentration because it has less oxygen deficiency or a lower impurity concentration than the source region and drain region.
- the carrier concentration in the channel formation region is preferably 1 ⁇ 10 18 cm -3 or less, more preferably less than 1 ⁇ 10 17 cm -3, and less than 1 ⁇ 10 16 cm -3. It is even more preferably less than 1 ⁇ 10 13 cm -3 , even more preferably less than 1 ⁇ 10 12 cm -3.
- the lower limit of the carrier concentration in the channel formation region is not particularly limited, but may be, for example, 1 ⁇ 10 -9 cm -3 .
- the oxide 230a may also have a channel formation region, a source region, and a drain region.
- a metal oxide also referred to as an oxide semiconductor
- oxide 230 oxide 230a and oxide 230b
- the metal oxide functioning as a semiconductor it is preferable to use a metal oxide having a band gap of 2 eV or more, preferably 2.5 eV or more. As described above, by using a metal oxide having a large bandgap, the off-current of the transistor can be reduced.
- oxide 230 for example, an In-M-Zn oxide having indium, element M and zinc (element M is aluminum, gallium, yttrium, tin, copper, vanadium, beryllium, boron, titanium, iron, nickel, germanium). , Zinc, molybdenum, lanthanum, cerium, neodymium, hafnium, tantalum, tungsten, magnesium, etc. (one or more) and other metal oxides may be used. Further, as the oxide 230, In—Ga oxide, In—Zn oxide, or indium oxide may be used.
- the atomic number ratio of In to the element M in the metal oxide used for the oxide 230b is larger than the atomic number ratio of In to the element M in the metal oxide used for the oxide 230a.
- a metal oxide having a composition in the vicinity thereof may be used.
- a metal oxide having a composition may be used.
- the composition in the vicinity includes a range of ⁇ 30% of the desired atomic number ratio. Further, it is preferable to use gallium as the element M.
- the above atomic number ratio is not limited to the atomic number ratio of the formed metal oxide, but is the atomic number ratio of the sputtering target used for forming the metal oxide. It may be.
- the oxide 230a under the oxide 230b By arranging the oxide 230a under the oxide 230b in this way, it is possible to suppress the diffusion of impurities and oxygen from the structure formed below the oxide 230a to the oxide 230b. ..
- the oxide 230a and the oxide 230b have a common element (main component) other than oxygen, the defect level density at the interface between the oxide 230a and the oxide 230b can be lowered. Since the defect level density at the interface between the oxide 230a and the oxide 230b can be lowered, the influence of interfacial scattering on carrier conduction is small, and a high on-current can be obtained.
- each oxide 230b has crystallinity.
- CAAC-OS c-axis aligned crystalline semiconductor semiconductor
- CAAC-OS is highly crystalline, has a dense structure, impurities and defects (e.g. oxygen vacancies (V O: also called oxygen Vacancy) etc.) is less metal oxides.
- the CAAC-OS is subjected to heat treatment at a temperature at which the metal oxide does not polycrystallize (for example, 400 ° C. or higher and 600 ° C. or lower), whereby CAAC-OS has a more crystalline and dense structure. Can be. In this way, by increasing the density of CAAC-OS, the diffusion of impurities or oxygen in the CAAC-OS can be further reduced.
- the metal oxide having CAAC-OS has stable physical properties. Therefore, the metal oxide having CAAC-OS is resistant to heat and has high reliability.
- At least one of the insulator 212, the insulator 214, the insulator 271, the insulator 275, the insulator 282, and the insulator 283 has impurities such as water and hydrogen from the substrate side or from above the transistor 200. It is preferable that it functions as a barrier insulating film that suppresses diffusion into.
- At least one of insulator 212, insulator 214, insulator 271, insulator 275, insulator 282, and insulator 283 is a hydrogen atom, a hydrogen molecule, a water molecule, a nitrogen atom, a nitrogen molecule, and a nitrogen oxide molecule
- an insulating material having a function of suppressing the diffusion of impurities such as N 2 O, NO, NO 2
- copper atoms the above impurities are difficult to permeate
- it is preferable to use an insulating material having a function of suppressing the diffusion of oxygen for example, at least one oxygen atom, oxygen molecule, etc.) (the oxygen is difficult to permeate).
- the barrier insulating film refers to an insulating film having a barrier property.
- the barrier property is a function of suppressing the diffusion of the corresponding substance (also referred to as low permeability).
- the corresponding substance has a function of capturing and fixing (also referred to as gettering).
- Examples of the insulator 212, insulator 214, insulator 271, insulator 275, insulator 282, and insulator 283 include aluminum oxide, magnesium oxide, hafnium oxide, gallium oxide, indium gallium zinc oxide, and silicon nitride. Alternatively, silicon nitride oxide or the like can be used. For example, as the insulator 212, the insulator 275, and the insulator 283, it is preferable to use silicon nitride or the like having a higher hydrogen barrier property. Further, for example, as the insulator 214, the insulator 271, and the insulator 282, it is preferable to use aluminum oxide or magnesium oxide having a high function of capturing hydrogen and fixing hydrogen.
- the transistor 200 has an insulator 212, an insulator 214, an insulator 271, an insulator 275, an insulator 282, and an insulator 283, which have a function of suppressing the diffusion of impurities such as water and hydrogen, and oxygen. It is preferable to have a structure surrounded by.
- an oxide having an amorphous structure as the insulator 212, the insulator 214, the insulator 271, the insulator 275, the insulator 282, and the insulator 283.
- a metal oxide such as AlO x (x is an arbitrary number larger than 0) or MgO y (y is an arbitrary number larger than 0).
- an oxygen atom has a dangling bond, and the dangling bond may have a property of capturing or fixing hydrogen.
- a metal oxide having such an amorphous structure as a component of the transistor 200 or providing it around the transistor 200, hydrogen contained in the transistor 200 or hydrogen existing around the transistor 200 is captured or fixed. be able to. In particular, it is preferable to capture or fix hydrogen contained in the channel forming region of the transistor 200.
- a metal oxide having an amorphous structure as a component of the transistor 200 or providing it around the transistor 200, the transistor 200 having good characteristics and high reliability and a semiconductor device can be manufactured.
- the insulator 212, the insulator 214, the insulator 271, the insulator 275, the insulator 282, and the insulator 283 preferably have an amorphous structure, but a region having a polycrystalline structure is partially formed. May be good. Further, the insulator 212, the insulator 214, the insulator 271, the insulator 275, the insulator 282, and the insulator 283 have a multilayer structure in which a layer having an amorphous structure and a layer having a polycrystalline structure are laminated. May be good. For example, it may be a laminated structure in which a layer having a polycrystalline structure is formed on a layer having an amorphous structure.
- the film formation of the insulator 212, the insulator 214, the insulator 271, the insulator 275, the insulator 282, and the insulator 283 may be performed by using, for example, a sputtering method. Since it is not necessary to use hydrogen as the film forming gas in the sputtering method, the hydrogen concentration of the insulator 212, the insulator 214, the insulator 271, the insulator 275, the insulator 282, and the insulator 283 can be reduced.
- the film forming method is not limited to the sputtering method, and a CVD method, an MBE method, a PLD method, an ALD method, or the like may be appropriately used.
- the insulator 216, the insulator 280, and the insulator 285 preferably have a lower dielectric constant than the insulator 214.
- a material having a low dielectric constant as an interlayer insulating film, it is possible to reduce the parasitic capacitance generated between the wirings.
- silicon oxide, silicon oxide nitride, silicon nitride oxide, silicon nitride, silicon oxide added with fluorine, silicon oxide added with carbon, carbon and nitrogen were added. Silicon oxide, silicon oxide having pores, or the like may be appropriately used.
- the conductor 205 is arranged so as to overlap the oxide 230 and the conductor 260.
- the conductor 205 has a conductor 205a, a conductor 205b, and a conductor 205c.
- the conductor 205a is provided in contact with the bottom surface and the side wall of the opening.
- the conductor 205b is provided so as to be embedded in the recess formed in the conductor 205a.
- the upper surface of the conductor 205b is lower than the upper surface of the conductor 205a and the upper surface of the insulator 216.
- the conductor 205c is provided in contact with the upper surface of the conductor 205b and the side surface of the conductor 205a.
- the height of the upper surface of the conductor 205c is substantially the same as the height of the upper surface of the conductor 205a and the height of the upper surface of the insulator 216. That is, the conductor 205b is wrapped in the conductor 205a and the conductor 205c.
- the conductor 205a and the conductor 205c a conductive material that can be used for the conductor 260a described later may be used.
- the conductor 205b a conductive material that can be used for the conductor 260b described later may be used.
- the conductor 205 shows a configuration in which the conductor 205a, the conductor 205b, and the conductor 205c are laminated, but the present invention is not limited to this.
- the conductor 205 may be provided as a single-layer, two-layer, or four-layer or higher laminated structure.
- the insulator 222 and the insulator 224 function as a gate insulating film.
- the insulator 222 preferably has a function of suppressing the diffusion of hydrogen (for example, at least one hydrogen atom, hydrogen molecule, etc.). Further, the insulator 222 preferably has a function of suppressing the diffusion of oxygen (for example, at least one oxygen atom, oxygen molecule, etc.). For example, it is preferable that the insulator 222 can suppress the diffusion of one or both of hydrogen and oxygen more than the insulator 224.
- the insulator 222 it is preferable to use an insulator containing oxides of one or both of aluminum and hafnium, which are insulating materials.
- the insulator it is preferable to use aluminum oxide, hafnium oxide, an oxide containing aluminum and hafnium (hafnium aluminate) and the like.
- a barrier insulating film that can be used for the above-mentioned insulator 214 or the like may be used.
- the insulator 224 silicon oxide, silicon oxide nitride, or the like may be appropriately used. By providing the insulator 224 containing oxygen in contact with the oxide 230, oxygen deficiency in the oxide 230 can be reduced and the reliability of the transistor 200 can be improved. Further, the insulator 224 is preferably processed into an island shape so as to be superimposed on the oxide 230a. In this case, the insulator 275 is in contact with the side surface of the insulator 224 and the upper surface of the insulator 222.
- the insulator 224 and the insulator 280 can be separated by the insulator 275, so that the oxygen contained in the insulator 280 diffuses into the insulator 224 and the oxygen in the insulator 224 becomes excessive. It can be suppressed.
- the insulator 222 and the insulator 224 may have a laminated structure of two or more layers.
- the laminated structure is not limited to the same material, and may be a laminated structure made of different materials.
- FIG. 9B and the like show a configuration in which the insulator 224 is superposed on the oxide 230a to form an island shape, the present invention is not limited to this. If the amount of oxygen contained in the insulator 224 can be adjusted appropriately, the insulator 224 may not be patterned, as in the insulator 222.
- Oxide 243a and oxide 243b are provided on oxide 230b.
- the oxide 243a and the oxide 243b are provided so as to be separated from each other with the conductor 260 interposed therebetween.
- the oxide 243 (oxide 243a and oxide 243b) preferably has a function of suppressing the permeation of oxygen.
- electricity between the conductor 242 and the oxide 230b can be obtained. This is preferable because the resistance is reduced. If the electrical resistance between the conductor 242 and the oxide 230b can be sufficiently reduced, the oxide 243 may not be provided.
- a metal oxide having an element M may be used.
- the element M aluminum, gallium, yttrium, or tin may be used.
- Oxide 243 preferably has a higher concentration of element M than oxide 230b.
- gallium oxide may be used as the oxide 243.
- a metal oxide such as In—M—Zn oxide may be used.
- the atomic number ratio of the element M to In is preferably larger than the atomic number ratio of the element M to In in the metal oxide used for the oxide 230b.
- the film thickness of the oxide 243 is preferably 0.5 nm or more and 5 nm or less, more preferably 1 nm or more and 3 nm or less, and further preferably 1 nm or more and 2 nm or less.
- the conductor 242a is provided in contact with the upper surface of the oxide 243a, and the conductor 242b is provided in contact with the upper surface of the oxide 243b.
- the conductor 242a and the conductor 242b each function as a source electrode or a drain electrode of the transistor 200.
- Examples of the conductor 242 include a nitride containing tantalum, a nitride containing titanium, a nitride containing molybdenum, a nitride containing tungsten, a nitride containing tantalum and aluminum, and titanium. It is preferable to use a nitride containing aluminum and the like. In one aspect of the invention, tantalum-containing nitrides are particularly preferred. Further, for example, ruthenium oxide, ruthenium nitride, an oxide containing strontium and ruthenium, an oxide containing lanthanum and nickel, and the like may be used. These materials are preferable because they are conductive materials that are difficult to oxidize or materials that maintain conductivity even when oxygen is absorbed.
- the conductor 242 it is preferable that no curved surface is formed between the side surface of the conductor 242 and the upper surface of the conductor 242.
- the cross-sectional area of the conductor 242 in the cross section in the channel width direction as shown in FIG. 9D can be increased.
- the conductivity of the conductor 242 can be increased, and the on-current of the transistor 200 can be increased.
- the insulator 271a is provided in contact with the upper surface of the conductor 242a, and the insulator 271b is provided in contact with the upper surface of the conductor 242b.
- the insulator 275 is in contact with the upper surface of the insulator 222, the side surface of the insulator 224, the side surface of the oxide 230a, the side surface of the oxide 230b, the side surface of the oxide 243, the side surface of the conductor 242, the side surface and the upper surface of the insulator 271. Is provided.
- the insulator 275 has an opening formed in a region where the insulator 250 and the conductor 260 are provided.
- the insulator 224 or the insulator can be provided. It is possible to capture impurities such as hydrogen contained in 216 and the like so that the amount of hydrogen in the region becomes a constant value. In this case, it is preferable that the insulator 214, the insulator 271, and the insulator 275 contain aluminum oxide having an amorphous structure.
- the insulator 250 has an insulator 250a and an insulator 250b on the insulator 250a, and functions as a gate insulating film. Further, the insulator 250a may be arranged in contact with the upper surface of the oxide 230b, the side surface of the oxide 243, the side surface of the conductor 242, the side surface of the insulator 271, the side surface of the insulator 275, and the side surface of the insulator 280. preferable.
- the film thickness of the insulator 250 is preferably 1 nm or more and 20 nm or less.
- the insulator 250a includes silicon oxide, silicon oxide, silicon nitride, silicon nitride, silicon oxide to which fluorine is added, silicon oxide to which carbon is added, silicon oxide to which carbon and nitrogen are added, silicon oxide having pores, and the like. Can be used. In particular, silicon oxide and silicon nitride nitride are preferable because they are stable against heat. Like the insulator 224, the insulator 250a preferably has a reduced concentration of impurities such as water and hydrogen in the insulator 250.
- the insulator 250a is formed by using an insulator in which oxygen is released by heating
- the insulator 250b is formed by using an insulator having a function of suppressing the diffusion of oxygen.
- oxygen contained in the insulator 250a can be suppressed from diffusing into the conductor 260. That is, it is possible to suppress a decrease in the amount of oxygen supplied to the oxide 230.
- oxidation of the conductor 260 by oxygen contained in the insulator 250a can be suppressed.
- the insulator 250b can be provided using the same material as the insulator 222.
- the insulator 250b specifically, a metal oxide containing one or more selected from hafnium, aluminum, gallium, yttrium, zirconium, tungsten, titanium, tantalum, nickel, germanium, magnesium and the like.
- a metal oxide that can be used as the oxide 230 can be used.
- the insulator it is preferable to use aluminum oxide, hafnium oxide, an oxide containing aluminum and hafnium (hafnium aluminate) and the like.
- the film thickness of the insulator 250b is preferably 0.5 nm or more and 3.0 nm or less, and more preferably 1.0 nm or more and 1.5 nm or less.
- the insulator 250 is shown in a two-layer laminated structure in FIGS. 9B and 9C, the present invention is not limited to this.
- the insulator 250 may have a single layer or a laminated structure of three or more layers.
- the conductor 260 is provided on the insulator 250b and functions as a first gate electrode of the transistor 200.
- the conductor 260 preferably has a conductor 260a and a conductor 260b arranged on the conductor 260a.
- the conductor 260a is preferably arranged so as to wrap the bottom surface and the side surface of the conductor 260b.
- the upper surface of the conductor 260 substantially coincides with the upper surface of the insulator 250.
- the conductor 260 is shown as a two-layer structure of the conductor 260a and the conductor 260b in FIGS. 9B and 9C, it may be a single-layer structure or a laminated structure of three or more layers.
- the conductor 260a it is preferable to use a conductive material having a function of suppressing the diffusion of impurities such as hydrogen atom, hydrogen molecule, water molecule, nitrogen atom, nitrogen molecule, nitrogen oxide molecule and copper atom.
- impurities such as hydrogen atom, hydrogen molecule, water molecule, nitrogen atom, nitrogen molecule, nitrogen oxide molecule and copper atom.
- a conductive material having a function of suppressing the diffusion of oxygen for example, at least one oxygen atom, oxygen molecule, etc.
- the conductor 260a has a function of suppressing the diffusion of oxygen, it is possible to prevent the conductor 260b from being oxidized by the oxygen contained in the insulator 250 and the conductivity from being lowered.
- the conductive material having a function of suppressing the diffusion of oxygen for example, titanium, titanium nitride, tantalum, tantalum nitride, ruthenium, ruthenium oxide and the like are preferably used.
- the conductor 260 also functions as wiring, it is preferable to use a conductor having high conductivity.
- a conductor having high conductivity for example, as the conductor 260b, a conductive material containing tungsten, copper, or aluminum as a main component can be used.
- the conductor 260b may have a laminated structure, for example, a laminated structure of titanium or titanium nitride and the conductive material.
- the conductor 260 is self-aligned so as to fill the opening formed in the insulator 280 or the like.
- the conductor 260 can be reliably arranged in the region between the conductor 242a and the conductor 242b without aligning the conductor 260.
- the height of the bottom surface of the conductor 260 in the region not overlapping with the oxide 230b when the bottom surface of the insulator 222 is used as a reference in the channel width direction of the transistor 200 is the oxide. It is preferably lower than the height of the bottom surface of 230b.
- the conductor 260 which functions as a gate electrode, covers the side surface and the upper surface of the channel forming region of the oxide 230b via an insulator 250 or the like, so that the electric field of the conductor 260 is covered with the channel forming region of the oxide 230b. It becomes easier to act on the whole. Therefore, the on-current of the transistor 200 can be increased and the frequency characteristics can be improved.
- the difference is 0 nm or more and 100 nm or less, preferably 3 nm or more and 50 nm or less, and more preferably 5 nm or more and 20 nm or less.
- the insulator 280 is provided on the insulator 275, and an opening is formed in a region where the insulator 250 and the conductor 260 are provided. Further, the upper surface of the insulator 280 may be flattened. In this case, it is preferable that the upper surface of the insulator 280 substantially coincides with the upper surface of the insulator 250 and the upper surface of the conductor 260.
- the insulator 282 is provided in contact with the upper surface of the insulator 280, the upper surface of the insulator 250, and the upper surface of the conductor 260.
- the insulator 282 preferably functions as a barrier insulating film that suppresses the diffusion of impurities such as water and hydrogen into the insulator 280 from above, and preferably has a function of capturing impurities such as hydrogen. Further, the insulator 282 preferably functions as a barrier insulating film that suppresses the permeation of oxygen.
- an insulator such as aluminum oxide may be used.
- the insulator 282 which has a function of capturing impurities such as hydrogen in contact with the insulator 280 in the region sandwiched between the insulator 212 and the insulator 283, hydrogen contained in the insulator 280 and the like, etc. Impurities can be captured and the amount of hydrogen in the region can be kept constant.
- the conductor 240a and the conductor 240b it is preferable to use a conductive material containing tungsten, copper, or aluminum as a main component. Further, the conductor 240a and the conductor 240b may have a laminated structure. When the conductor 240 has a laminated structure, it is preferable to use a conductive material having a function of suppressing the permeation of impurities such as water and hydrogen as the conductor in contact with the insulator 241. For example, a conductive material that can be used for the above-mentioned conductor 260a may be used.
- an insulator such as silicon nitride, aluminum oxide, or silicon nitride may be used. Since the insulator 241a and the insulator 241b are provided in contact with the insulator 283, the insulator 282, and the insulator 271, impurities such as water and hydrogen contained in the insulator 280 and the like are removed from the conductor 240a and the conductor 240b. It is possible to prevent the oxide 230 from being mixed with the oxide 230.
- the conductor 246 (conductor 246a and conductor 246b) that functions as wiring may be arranged in contact with the upper surface of the conductor 240a and the upper surface of the conductor 240b.
- the conductor 246 it is preferable to use a conductive material containing tungsten, copper, or aluminum as a main component.
- the conductor may have a laminated structure, for example, titanium or titanium nitride may be laminated with the conductive material.
- the conductor may be formed so as to be embedded in an opening provided in the insulator.
- metal oxide also referred to as an oxide semiconductor
- the metal oxide preferably contains at least indium or zinc. In particular, it preferably contains indium and zinc. In addition to them, it is preferable that aluminum, gallium, yttrium, tin and the like are contained. It may also contain one or more selected from boron, silicon, titanium, iron, nickel, germanium, zirconium, molybdenum, lanthanum, cerium, neodymium, hafnium, tantalum, tungsten, magnesium, cobalt and the like. ..
- the metal oxide can be formed by a CVD method such as a sputtering method, a metalorganic chemical vapor deposition (MOCVD) method, or an ALD method.
- a CVD method such as a sputtering method, a metalorganic chemical vapor deposition (MOCVD) method, or an ALD method.
- the crystal structure of the oxide semiconductor includes amorphous (including compactly atomous), CAAC (c-axis-aligned crystalline), nc (nanocrystalline), CAC (crowd-aligned crystal), single crystal (single crystal), and single crystal. (Poly crystal) and the like.
- the crystal structure of the film or substrate can be evaluated using an X-ray diffraction (XRD) spectrum.
- XRD X-ray diffraction
- it can be evaluated using the XRD spectrum obtained by GIXD (Graxing-Incidence XRD) measurement.
- GIXD Gram-Incidence XRD
- the GIXD method is also referred to as a thin film method or a Seemann-Bohlin method.
- the shape of the peak of the XRD spectrum is almost symmetrical.
- the shape of the peak of the XRD spectrum is asymmetrical.
- the asymmetrical shape of the peaks in the XRD spectrum clearly indicates the presence of crystals in the film or substrate. In other words, the film or substrate cannot be said to be in an amorphous state unless the shape of the peak of the XRD spectrum is symmetrical.
- the crystal structure of the film or substrate can be evaluated by a diffraction pattern (also referred to as a microelectron diffraction pattern) observed by a micro electron diffraction method (NBED: Nano Beam Electron Diffraction).
- a diffraction pattern also referred to as a microelectron diffraction pattern
- NBED Nano Beam Electron Diffraction
- halos are observed, and it can be confirmed that the quartz glass is in an amorphous state.
- a spot-like pattern is observed instead of a halo. Therefore, it is presumed that the IGZO film formed at room temperature is neither in a crystalline state nor in an amorphous state, is in an intermediate state, and cannot be concluded to be in an amorphous state.
- oxide semiconductors may be classified differently from the above.
- oxide semiconductors are divided into single crystal oxide semiconductors and other non-single crystal oxide semiconductors.
- the non-single crystal oxide semiconductor include the above-mentioned CAAC-OS and nc-OS.
- the non-single crystal oxide semiconductor includes a polycrystalline oxide semiconductor, a pseudo-amorphous oxide semiconductor (a-like OS: amorphous-like oxide semiconductor), an amorphous oxide semiconductor, and the like.
- CAAC-OS CAAC-OS
- nc-OS nc-OS
- a-like OS the details of the above-mentioned CAAC-OS, nc-OS, and a-like OS will be described.
- CAAC-OS is an oxide semiconductor having a plurality of crystal regions, and the plurality of crystal regions are oriented in a specific direction on the c-axis.
- the specific direction is the thickness direction of the CAAC-OS film, the normal direction of the surface to be formed of the CAAC-OS film, or the normal direction of the surface of the CAAC-OS film.
- the crystal region is a region having periodicity in the atomic arrangement. When the atomic arrangement is regarded as a lattice arrangement, the crystal region is also a region in which the lattice arrangement is aligned. Further, the CAAC-OS has a region in which a plurality of crystal regions are connected in the ab plane direction, and the region may have distortion.
- the strain refers to a region in which a plurality of crystal regions are connected in which the orientation of the lattice arrangement changes between a region in which the lattice arrangement is aligned and a region in which another grid arrangement is aligned. That is, CAAC-OS is an oxide semiconductor that is c-axis oriented and not clearly oriented in the ab plane direction.
- Each of the plurality of crystal regions is composed of one or a plurality of minute crystals (crystals having a maximum diameter of less than 10 nm).
- the maximum diameter of the crystal region is less than 10 nm.
- the size of the crystal region may be about several tens of nm.
- CAAC-OS has indium (In) and oxygen. It tends to have a layered crystal structure (also referred to as a layered structure) in which a layer (hereinafter, In layer) and a layer having elements M, zinc (Zn), and oxygen (hereinafter, (M, Zn) layer) are laminated. There is. Indium and element M can be replaced with each other. Therefore, the (M, Zn) layer may contain indium. In addition, the In layer may contain the element M. The In layer may contain Zn.
- the layered structure is observed as a lattice image in, for example, a high-resolution TEM image.
- the position of the peak indicating the c-axis orientation may vary depending on the type and composition of the metal elements constituting CAAC-OS.
- a plurality of bright spots are observed in the electron diffraction pattern of the CAAC-OS film.
- a certain spot and another spot are observed at point-symmetrical positions with the spot of the incident electron beam passing through the sample (also referred to as a direct spot) as the center of symmetry.
- the lattice arrangement in the crystal region is based on a hexagonal lattice, but the unit lattice is not limited to a regular hexagon and may be a non-regular hexagon. Further, in the above strain, it may have a lattice arrangement such as a pentagon or a heptagon.
- a clear grain boundary cannot be confirmed even in the vicinity of strain. That is, it can be seen that the formation of grain boundaries is suppressed by the distortion of the lattice arrangement. This is because CAAC-OS allows distortion due to the fact that the arrangement of oxygen atoms is not dense in the ab plane direction and that the bond distance between atoms changes due to the replacement of metal atoms. It is thought that it can be done.
- CAAC-OS for which no clear crystal grain boundary is confirmed, is one of the crystalline oxides having a crystal structure suitable for the semiconductor layer of the transistor.
- a configuration having Zn is preferable.
- In-Zn oxide and In-Ga-Zn oxide are more suitable than In oxide because they can suppress the generation of grain boundaries.
- CAAC-OS is an oxide semiconductor having high crystallinity and no clear grain boundary is confirmed. Therefore, it can be said that CAAC-OS is unlikely to cause a decrease in electron mobility due to grain boundaries. Further, since the crystallinity of the oxide semiconductor may decrease due to the mixing of impurities and the generation of defects, CAAC-OS can be said to be an oxide semiconductor having few impurities and defects (oxygen deficiency, etc.). Therefore, the oxide semiconductor having CAAC-OS has stable physical properties. Therefore, the oxide semiconductor having CAAC-OS is resistant to heat and has high reliability. CAAC-OS is also stable against high temperatures (so-called thermal budgets) in the manufacturing process. Therefore, when CAAC-OS is used for the OS transistor, the degree of freedom in the manufacturing process can be expanded.
- nc-OS has periodicity in the atomic arrangement in a minute region (for example, a region of 1 nm or more and 10 nm or less, particularly a region of 1 nm or more and 3 nm or less).
- nc-OS has tiny crystals. Since the size of the minute crystal is, for example, 1 nm or more and 10 nm or less, particularly 1 nm or more and 3 nm or less, the minute crystal is also referred to as a nanocrystal.
- nc-OS does not show regularity in crystal orientation between different nanocrystals. Therefore, no orientation is observed in the entire film.
- nc-OS may be indistinguishable from a-like OS and / or amorphous oxide semiconductor depending on the analysis method. For example, when a structural analysis is performed on an nc-OS film using an XRD apparatus, a peak indicating crystallinity is not detected in the Out-of-plane XRD measurement using a ⁇ / 2 ⁇ scan. Further, when electron beam diffraction (also referred to as selected area electron diffraction) using an electron beam having a probe diameter larger than that of nanocrystals (for example, 50 nm or more) is performed on the nc-OS film, a diffraction pattern such as a halo pattern is performed. Is observed.
- electron beam diffraction also referred to as selected area electron diffraction
- nanocrystals for example, 50 nm or more
- electron diffraction also referred to as nanobeam electron diffraction
- an electron beam having a probe diameter for example, 1 nm or more and 30 nm or less
- An electron diffraction pattern in which a plurality of spots are observed in a ring-shaped region centered on a direct spot may be acquired.
- the a-like OS is an oxide semiconductor having a structure between nc-OS and an amorphous oxide semiconductor.
- the a-like OS has a void or low density region. That is, a-like OS has lower crystallinity than nc-OS and CAAC-OS. In addition, a-like OS has a higher hydrogen concentration in the membrane than nc-OS and CAAC-OS.
- CAC-OS relates to the material composition.
- CAC-OS is, for example, a composition of a material in which the elements constituting the metal oxide are unevenly distributed in a size of 0.5 nm or more and 10 nm or less, preferably 1 nm or more and 3 nm or less, or a size close thereto.
- the metal oxide one or more metal elements are unevenly distributed, and the region having the metal element has a size of 0.5 nm or more and 10 nm or less, preferably 1 nm or more and 3 nm or less, or a size close thereto.
- the mixed state is also called a mosaic shape or a patch shape.
- CAC-OS has a structure in which the material is separated into a first region and a second region to form a mosaic shape, and the first region is distributed in the membrane (hereinafter, also referred to as a cloud shape). It says.). That is, CAC-OS is a composite metal oxide having a structure in which the first region and the second region are mixed.
- the atomic number ratios of In, Ga, and Zn with respect to the metal elements constituting CAC-OS in the In-Ga-Zn oxide are expressed as [In], [Ga], and [Zn], respectively.
- the first region is a region in which [In] is larger than [In] in the composition of the CAC-OS film.
- the second region is a region in which [Ga] is larger than [Ga] in the composition of the CAC-OS film.
- the first region is a region in which [In] is larger than [In] in the second region and [Ga] is smaller than [Ga] in the second region.
- the second region is a region in which [Ga] is larger than [Ga] in the first region and [In] is smaller than [In] in the first region.
- the first region is a region in which indium oxide, indium zinc oxide, or the like is the main component.
- the second region is a region in which gallium oxide, gallium zinc oxide, or the like is the main component. That is, the first region can be rephrased as a region containing In as a main component. Further, the second region can be rephrased as a region containing Ga as a main component.
- CAC-OS in In-Ga-Zn oxide is a region containing Ga as a main component and a part of In as a main component in a material composition containing In, Ga, Zn, and O. Each of the regions is mosaic, and these regions are randomly present. Therefore, it is presumed that CAC-OS has a structure in which metal elements are non-uniformly distributed.
- the CAC-OS can be formed by a sputtering method, for example, under the condition that the substrate is not heated.
- a sputtering method one or more selected from an inert gas (typically argon), an oxygen gas, and a nitrogen gas may be used as the film forming gas. Good.
- the flow rate ratio of the oxygen gas to the total flow rate of the film-forming gas at the time of film formation is preferably 0% or more and less than 30%. Is preferably 0% or more and 10% or less.
- EDX Energy Dispersive X-ray spectroscopy
- the first region is a region having higher conductivity than the second region. That is, when the carrier flows through the first region, the conductivity as a metal oxide is exhibited. Therefore, high field effect mobility ( ⁇ ) can be realized by distributing the first region in the metal oxide in a cloud shape.
- the second region is a region having higher insulating properties than the first region. That is, the leakage current can be suppressed by distributing the second region in the metal oxide.
- CAC-OS when CAC-OS is used for a transistor, the conductivity caused by the first region and the insulating property caused by the second region act in a complementary manner to cause a switching function (On / Off). Function) can be added to CAC-OS. That is, the CAC-OS has a conductive function in a part of the material and an insulating function in a part of the material, and has a function as a semiconductor in the whole material. By separating the conductive function and the insulating function, both functions can be maximized. Therefore, by using CAC-OS for the transistor, high on-current ( Ion ), high field effect mobility ( ⁇ ), and good switching operation can be realized.
- Ion on-current
- ⁇ high field effect mobility
- CAC-OS is most suitable for various semiconductor devices including display devices.
- Oxide semiconductors have various structures, and each has different characteristics.
- the oxide semiconductor of one aspect of the present invention has two or more of amorphous oxide semiconductor, polycrystalline oxide semiconductor, a-like OS, CAC-OS, nc-OS, and CAAC-OS. You may.
- the display device of the present embodiment has a plurality of pixels arranged in a matrix of m rows and n columns (m and n are integers of 1 or more each).
- FIG. 10 shows an example of a circuit diagram of pixels PIX (i, j) (i is an integer of 1 or more and m or less, and j is an integer of 1 or more and n or less).
- the pixel PIX (i, j) shown in FIG. 10 has a light emitting device 110 (also referred to as a light emitting element), a switch SW21, a transistor M, and a capacitance C1.
- the pixel PIX (i, j) may further have a switch SW22.
- a light emitting diode is used as the light emitting device 110 is shown.
- the switch SW21 an example in which a transistor is used as the switch SW21 is shown.
- the gate of the switch SW21 is electrically connected to the scanning line GL1 (i).
- One of the source and drain of the switch SW21 is electrically connected to the signal line SL (j), and the other is electrically connected to the gate of the transistor M.
- the switch SW22 is shown.
- the gate of the switch SW22 is electrically connected to the scanning line GL2 (i).
- One of the source and drain of the switch SW22 is electrically connected to the wiring COM, and the other is electrically connected to the gate of the transistor M.
- the gate of the transistor M is electrically connected to one electrode of the capacitance C1, the other of the source and drain of the switch SW21, and the other of the source and drain of the switch SW22.
- One of the source and drain of the transistor M is electrically connected to the wiring CATHODE, and the other is electrically connected to the cathode of the light emitting device 110.
- the other electrode of capacitance C1 is electrically connected to the wiring Cathode.
- the anode of the light emitting device 110 is electrically connected to the wiring ANODE.
- the scanning line GL1 (i) has a function of supplying a selection signal.
- the scanning line GL2 (i) has a function of supplying a control signal.
- the signal line SL (j) has a function of supplying an image signal.
- a constant potential is supplied to each of the wiring COM, the wiring CATHODE, and the wiring anode.
- the anode side of the light emitting device 110 can have a high potential, and the cathode side can have a lower potential than the anode side.
- the switch SW21 is controlled by a selection signal and functions as a selection transistor for controlling the selection state of the pixel PIX (i, j).
- the transistor M functions as a drive transistor that controls the current flowing through the light emitting device 110 according to the potential supplied to the gate.
- the switch SW21 is in the conductive state, the image signal supplied to the signal line SL (j) is supplied to the gate of the transistor M, and the emission brightness of the light emitting device 110 can be controlled according to the potential thereof.
- the switch SW22 has a function of controlling the gate potential of the transistor M based on the control signal. Specifically, the switch SW22 can supply a potential that causes the transistor M to be in a non-conducting state to the gate of the transistor M.
- the switch SW22 can be used, for example, to control the pulse width.
- a current can be supplied from the transistor M to the light emitting device 110 for a period based on the control signal.
- the light emitting device 110 can express gradation based on the image signal and the control signal.
- a transistor using a metal oxide (oxide semiconductor) to the semiconductor layer on which a channel is formed, respectively, for the transistor included in the pixel PIX (i, j).
- Transistors using metal oxides with a wider bandgap and lower carrier concentration than silicon can achieve extremely small off-currents. Therefore, due to the small off-current, it is possible to retain the electric charge accumulated in the capacitance connected in series with the transistor for a long period of time. Therefore, it is particularly preferable to use a transistor to which an oxide semiconductor is applied for the switch SW21 and the switch SW22 connected in series with the capacitance C1. Further, by using a transistor to which an oxide semiconductor is applied for other transistors as well, the manufacturing cost can be reduced.
- a transistor in which silicon is applied to a semiconductor in which a channel is formed can also be used.
- a transistor to which an oxide semiconductor is applied to one or more is used, and a transistor to which silicon is applied may be used in addition to the transistor.
- the transistor is shown as an n-channel type transistor in FIG. 10, a p-channel type transistor can also be used.
- the electronic device of the present embodiment has a display device of one aspect of the present invention in the display unit.
- the display device of one aspect of the present invention has high display quality and low power consumption. Further, the display device according to one aspect of the present invention can easily be made high in definition and high in resolution. Therefore, it can be used as a display unit of various electronic devices.
- Electronic devices include, for example, electronic devices with relatively large screens such as television devices, desktop or notebook personal computers, monitors for computers, digital signage, and large game machines such as pachinko machines, as well as digital devices. Examples include cameras, digital video cameras, digital photo frames, mobile phones, portable game machines, mobile information terminals, sound reproduction devices, and the like.
- the display device of one aspect of the present invention can increase the definition, it can be suitably used for an electronic device having a relatively small display unit.
- electronic devices include wristwatch-type and bracelet-type information terminals (wearable devices).
- wearable devices include wearable devices that can be worn on the head, such as devices for VR such as head-mounted displays, devices for glasses-type AR, and devices for MR.
- the display device of one aspect of the present invention includes HD (number of pixels 1280 ⁇ 720), FHD (number of pixels 1920 ⁇ 1080), WQHD (number of pixels 2560 ⁇ 1440), WQXGA (number of pixels 2560 ⁇ 1600), 4K (number of pixels). It is preferable to have an extremely high resolution such as 3840 ⁇ 2160) and 8K (number of pixels 7680 ⁇ 4320). In particular, it is preferable to set the resolution to 4K, 8K, or higher.
- the pixel density (definition) in the display device of one aspect of the present invention is preferably 300 ppi or more, more preferably 500 ppi or more, more preferably 1000 ppi or more, more preferably 3000 ppi or more, more preferably 5000 ppi or more, and more preferably 7000 ppi or more. Is even more preferable.
- a display device having such a high resolution and / or high definition it is possible to further enhance the sense of presence and depth in personal-use electronic devices such as portable and home-use electronic devices.
- the electronic device of the present embodiment is a sensor (force, displacement, position, speed, acceleration, angular velocity, rotation speed, distance, light, liquid, magnetism, temperature, chemical substance, voice, time, hardness, electric field, current, voltage. , Including the ability to measure power, radiation, flow rate, humidity, gradient, vibration, odor or infrared rays).
- the electronic device of the present embodiment can have various functions. For example, a function to display various information (still images, moving images, text images, etc.) on the display unit, a touch panel function, a function to display a calendar, date or time, a function to execute various software (programs), wireless communication. It can have a function, a function of reading a program or data recorded on a recording medium, and the like.
- FIG. 11A shows a perspective view of the glasses-type electronic device 700.
- the electronic device 700 includes a pair of display panels 701, a pair of housings 702, a pair of optical members 703, a pair of mounting portions 704, a frame 707, a nose pad 708, and the like.
- the electronic device 700 can project the image displayed on the display panel 701 onto the display area 706 of the optical member 703. Since the optical member 703 has translucency, the user can see the image displayed in the display area 706 by superimposing it on the transmitted image visually recognized through the optical member 703. Therefore, the electronic device 700 is an electronic device capable of AR display.
- One or both housings 702 may be provided with a camera capable of photographing the front. Further, the housing 702 may have a wireless communication device, and the wireless communication device can supply a video signal or the like to the housing 702. In addition to the wireless communication device or in addition to the wireless communication device, a connector to which a cable to which a video signal and / or a power supply potential is supplied may be connected may be provided. Further, by equipping the housing 702 with an acceleration sensor such as a gyro sensor, it is possible to detect the orientation of the user's head and display an image corresponding to the orientation in the display area 706.
- an acceleration sensor such as a gyro sensor
- a processor may be provided in one or both housings 702.
- the processor has a function of controlling various components of the electronic device 700, such as a camera, a wireless communication device, and a pair of display panels 701, and a function of generating an image.
- the processor may have a function of generating a composite image for AR display.
- the wireless communication device can communicate data with an external device.
- data transmitted from the outside is output to a processor, and the processor can also generate image data for AR display based on the data.
- Examples of data transmitted from the outside include image data and data including biometric information transmitted from a biosensor device or the like.
- a method of projecting an image onto the display area 706 of the electronic device 700 will be described with reference to FIG. 11B.
- a display panel 701 is provided inside the housing 702. Further, the optical member 703 is provided with a reflector 712, and a reflection surface 713 functioning as a half mirror is provided in a portion of the optical member 703 corresponding to the display area 706.
- the light 715 emitted from the display panel 701 is reflected by the reflector 712 toward the optical member 703. Inside the optical member 703, the light 715 repeats total internal reflection at the end surface of the optical member 703 and reaches the reflecting surface 713, so that an image is projected on the reflecting surface 713. As a result, the user can visually recognize both the light 715 reflected by the reflecting surface 713 and the transmitted light 716 transmitted through the optical member 703 (including the reflecting surface 713).
- FIG. 11 shows an example in which the reflector 712 and the reflector 713 each have a curved surface.
- the degree of freedom in optical design can be increased and the thickness of the optical member 703 can be reduced as compared with the case where these are flat surfaces.
- the reflector 712 and the reflection surface 713 may be flat.
- the reflector 712 a member having a mirror surface can be used, and it is preferable that the reflector has a high reflectance. Further, as the reflecting surface 713, a half mirror utilizing the reflection of the metal film may be used, but if a prism or the like utilizing the total reflection is used, the transmittance of the transmitted light 716 can be increased.
- the housing 702 may have a lens between the display panel 701 and the reflector 712. At this time, it is preferable that the housing 702 has a mechanism for adjusting the distance between the lens and the display panel 701 and the angles thereof. This makes it possible to adjust the focus and enlarge / reduce the image.
- the lens and the display panel 701 may be configured to be movable in the optical axis direction.
- the housing 702 has a mechanism capable of adjusting the angle of the reflector 712. By changing the angle of the reflector 712, it is possible to change the position of the display area 706 in which the image is displayed. This makes it possible to arrange the display area 706 at an optimum position according to the position of the user's eyes.
- the housing 702 is preferably provided with a battery 717 and a wireless power supply module 718.
- a battery 717 By having the battery 717, it can be used without separately connecting the battery to the electronic device 700, so that the convenience can be enhanced. Further, by having the wireless power supply module 718, it can be charged wirelessly, so that convenience and design can be enhanced. Further, the risk of failure such as contact failure can be reduced and the reliability of the electronic device 700 can be improved as compared with the case of charging by wire with a connector or the like.
- the housing 702 is provided with a touch sensor module 719.
- the touch sensor module 719 has a function of detecting that the outer surface of the housing 702 is touched.
- FIG. 11B shows how the surface of the housing 702 is touched by the finger 720.
- the touch sensor module 719 can detect a user's tap operation and / or slide operation and execute various processes. For example, it is possible to execute a process such as pausing and resuming a moving image by a tap operation, and to execute a process of fast forward and fast rewind by a slide operation. Further, by providing the touch sensor module 719 in each of the two housings 702, the range of operations can be expanded.
- various touch sensors can be applied.
- various methods such as a capacitance method, a resistance film method, an infrared method, an electromagnetic induction method, a surface acoustic wave method, and an optical method can be adopted.
- a photoelectric conversion device (also referred to as a photoelectric conversion element) can be used as the light receiving device (also referred to as a light receiving element).
- the photoelectric conversion device include those using an inorganic semiconductor for the active layer, those using an organic semiconductor, and the like.
- a display device can be applied to the display panel 701. Therefore, it is possible to obtain an electronic device 700 capable of displaying extremely high definition.
- FIG. 12A and 12B show perspective views of the goggle-type electronic device 950.
- FIG. 12A is a perspective view showing the front surface, the plane surface, and the left side surface of the electronic device 950
- FIG. 12B is a perspective view showing the back surface, the bottom surface, and the right side surface of the electronic device 950.
- the electronic device 950 includes a pair of display panels 951, a housing 952, a pair of mounting portions 954, a cushioning member 955, a pair of lenses 956, and the like.
- the pair of display panels 951 are provided at positions inside the housing 952 that can be visually recognized through the lens 956.
- the electronic device 950 is an electronic device for VR.
- a user wearing the electronic device 950 can visually recognize the image displayed on the display panel 951 through the lens 956. Further, by displaying different images on the pair of display panels 951, it is possible to perform three-dimensional display using parallax.
- An input terminal 957 and an output terminal 958 are provided on the back side of the housing 952.
- a cable for supplying a video signal from a video output device or the like and power for charging a battery provided in the housing 952 can be connected to the input terminal 957.
- the output terminal 958 can function as, for example, an audio output terminal, and can be connected to earphones, headphones, or the like. If the audio data can be output by wireless communication, or if the audio is output from an external video output device, the audio output terminal may not be provided.
- the electronic device 950 preferably has a mechanism capable of adjusting the left and right positions of the lens 956 and the display panel 951 so as to be optimally positioned according to the position of the user's eyes. Further, it is preferable to have a mechanism for adjusting the focus by changing the distance between the lens 956 and the display panel 951.
- a display device can be applied to the display panel 951. Therefore, it is possible to obtain an electronic device 950 capable of displaying extremely high definition. This makes the user feel highly immersive.
- the cushioning member 955 is a portion that comes into contact with the user's face (forehead, cheeks, etc.). When the cushioning member 955 is in close contact with the user's face, light leakage can be prevented and the immersive feeling can be further enhanced. It is preferable to use a soft material for the cushioning member 955 so that the shock absorbing member 955 will come into close contact with the user's face when the user wears the electronic device 950. For example, materials such as rubber, silicone rubber, urethane, and sponge can be used.
- the cushioning member 955 when a material such as a sponge whose surface is covered with cloth or leather (natural leather or synthetic leather) is used as the cushioning member 955, a gap is less likely to occur between the user's face and the cushioning member 955, and light leakage is preferable. Can be prevented.
- Members that come into contact with the user's skin, such as the cushioning member 955 and the mounting portion 954, are preferably configured to be removable because they can be easily cleaned and replaced.
- the electronic device 6500 shown in FIG. 13A is a portable information terminal that can be used as a smartphone.
- the electronic device 6500 includes a housing 6501, a display unit 6502, a power button 6503, a button 6504, a speaker 6505, a microphone 6506, a camera 6507, a light source 6508, and the like.
- the display unit 6502 has a touch panel function.
- a display device can be applied to the display unit 6502.
- FIG. 13B is a schematic cross-sectional view including an end portion of the housing 6501 on the microphone 6506 side.
- a translucent protective member 6510 is provided on the display surface side of the housing 6501, and the display panel 6511, the optical member 6512, the touch sensor panel 6513, and the printed circuit board are provided in the space surrounded by the housing 6501 and the protective member 6510.
- a substrate 6517, a battery 6518, and the like are arranged.
- a display panel 6511, an optical member 6512, and a touch sensor panel 6513 are fixed to the protective member 6510 by an adhesive layer (not shown).
- a part of the display panel 6511 is folded back, and the FPC 6515 is connected to the folded back portion.
- IC6516 is mounted on FPC6515.
- the FPC6515 is connected to a terminal provided on the printed circuit board 6517.
- a flexible display according to one aspect of the present invention can be applied to the display panel 6511. Therefore, an extremely lightweight electronic device can be realized. Further, since the display panel 6511 is extremely thin, it is possible to mount a large-capacity battery 6518 while suppressing the thickness of the electronic device. Further, by folding back a part of the display panel 6511 and arranging the connection portion with the FPC 6515 on the back side of the pixel portion, an electronic device having a narrow frame can be realized.
- FIG. 14A shows an example of a television device.
- the display unit 7000 is incorporated in the housing 7101.
- a configuration in which the housing 7101 is supported by the stand 7103 is shown.
- a display device can be applied to the display unit 7000.
- the operation of the television device 7100 shown in FIG. 14A can be performed by the operation switch provided in the housing 7101 and the separate remote control operation machine 7111.
- the display unit 7000 may be provided with a touch sensor, and the television device 7100 may be operated by touching the display unit 7000 with a finger or the like.
- the remote controller 7111 may have a display unit that displays information output from the remote controller 7111.
- the channel and volume can be operated by the operation keys or the touch panel provided on the remote controller 7111, and the image displayed on the display unit 7000 can be operated.
- the television device 7100 is configured to include a receiver, a modem, and the like.
- the receiver can receive general television broadcasts.
- information communication is performed in one direction (from sender to receiver) or in two directions (between sender and receiver, or between recipients, etc.). It is also possible.
- FIG. 14B shows an example of a notebook personal computer.
- the notebook personal computer 7200 has a housing 7211, a keyboard 7212, a pointing device 7213, an external connection port 7214, and the like.
- a display unit 7000 is incorporated in the housing 7211.
- a display device can be applied to the display unit 7000.
- the digital signage 7300 shown in FIG. 14C has a housing 7301, a display unit 7000, a speaker 7303, and the like. Further, it may have an LED lamp, an operation key (including a power switch or an operation switch), a connection terminal, various sensors, a microphone, and the like.
- FIG. 14D is a digital signage 7400 attached to a columnar pillar 7401.
- the digital signage 7400 has a display unit 7000 provided along the curved surface of the pillar 7401.
- the display device of one aspect of the present invention can be applied to the display unit 7000.
- the wider the display unit 7000 the more information can be provided at one time. Further, the wider the display unit 7000 is, the easier it is to be noticed by people, and for example, the advertising effect of the advertisement can be enhanced.
- the touch panel By applying the touch panel to the display unit 7000, not only the image or moving image can be displayed on the display unit 7000, but also the user can intuitively operate the display unit 7000, which is preferable. In addition, when used for the purpose of providing information such as route information or traffic information, usability can be improved by intuitive operation.
- the digital signage 7300 or the digital signage 7400 can be linked with the information terminal 7311 such as a smartphone or the information terminal 7411 owned by the user by wireless communication.
- the information of the advertisement displayed on the display unit 7000 can be displayed on the screen of the information terminal 7311 or the information terminal 7411. Further, by operating the information terminal 7311 or the information terminal 7411, the display of the display unit 7000 can be switched.
- the digital signage 7300 or the digital signage 7400 can be made to execute a game using the screen of the information terminal 7311 or the information terminal 7411 as an operation means (controller). As a result, an unspecified number of users can participate in and enjoy the game at the same time.
- the electronic devices shown in FIGS. 15A to 15F include a housing 9000, a display unit 9001, a speaker 9003, an operation key 9005 (including a power switch or an operation switch), a connection terminal 9006, and a sensor 9007 (force, displacement, position, speed). , Acceleration, angular velocity, rotation speed, distance, light, liquid, magnetism, temperature, chemical substance, voice, time, hardness, electric field, current, voltage, power, radiation, flow rate, humidity, gradient, vibration, smell or infrared (Including the function of), microphone 9008, and the like.
- the electronic devices shown in FIGS. 15A to 15F have various functions. For example, a function to display various information (still images, moving images, text images, etc.) on the display unit, a touch panel function, a function to display a calendar, date or time, etc., a function to control processing by various software (programs), It can have a wireless communication function, a function of reading and processing a program or data recorded on a recording medium, and the like.
- the functions of electronic devices are not limited to these, and can have various functions.
- the electronic device may have a plurality of display units.
- the camera has a function of providing a camera or the like in an electronic device, taking a still image and / or a moving image and saving it in a recording medium (external or built in the camera), a function of displaying the taken image on a display unit, and the like. You may.
- FIGS. 15A to 15F Details of the electronic devices shown in FIGS. 15A to 15F will be described below.
- FIG. 15A is a perspective view showing a mobile information terminal 9101.
- the mobile information terminal 9101 can be used as, for example, a smartphone.
- the mobile information terminal 9101 may be provided with a speaker 9003, a connection terminal 9006, a sensor 9007, and the like. Further, the mobile information terminal 9101 can display character and / or image information on a plurality of surfaces thereof.
- FIG. 15A shows an example in which three icons 9050 are displayed. Further, the information 9051 indicated by the broken line rectangle can be displayed on another surface of the display unit 9001. Examples of information 9051 include notification of incoming calls such as e-mail, SNS, and telephone, titles such as e-mail and SNS, sender name, date and time, time, remaining battery level, and radio wave strength. Alternatively, an icon 9050 or the like may be displayed at the position where the information 9051 is displayed.
- FIG. 15B is a perspective view showing a mobile information terminal 9102.
- the mobile information terminal 9102 has a function of displaying information on three or more surfaces of the display unit 9001.
- information 9052, information 9053, and information 9054 are displayed on different surfaces.
- the user can check the information 9053 displayed at a position that can be observed from above the mobile information terminal 9102 with the mobile information terminal 9102 stored in the chest pocket of the clothes.
- the user can check the display without taking out the mobile information terminal 9102 from the pocket, and can determine, for example, whether or not to receive a call.
- FIG. 15C is a perspective view showing a wristwatch-type portable information terminal 9200.
- the mobile information terminal 9200 can be used as, for example, a smart watch.
- the display unit 9001 is provided with a curved display surface, and can display along the curved display surface.
- the mobile information terminal 9200 can also make a hands-free call by, for example, intercommunication with a headset capable of wireless communication.
- the mobile information terminal 9200 can also perform data transmission and / or charge with other information terminals by means of the connection terminal 9006.
- the charging operation may be performed by wireless power supply.
- 15D to 15F are perspective views showing a foldable mobile information terminal 9201.
- 15D is a perspective view of the mobile information terminal 9201 in an unfolded state
- FIG. 15F is a folded state
- FIG. 15E is a perspective view of a state in which one of FIGS. 15D and 15F is in the process of changing to the other.
- the mobile information terminal 9201 is excellent in portability in the folded state, and is excellent in display listability due to a wide seamless display area in the unfolded state.
- the display unit 9001 included in the personal digital assistant terminal 9201 is supported by three housings 9000 connected by a hinge 9055.
- the display unit 9001 can be bent with a radius of curvature of 0.1 mm or more and 150 mm or less.
- ANODE Wiring, CATHEAD: Wiring, COM: Wiring, CCMR: Color conversion layer, CFR: Colored layer, C1: Capacitance, GL1: Scan line, GL2: Scan line, M: Conductor, PIX: Pixel, SL: Signal line SW21: Switch, SW22: Switch, 100A: Display device, 100B: Display device, 100C: Display device, 101: Substrate, 102: Insulation layer, 103: Insulation layer, 104: Insulation layer, 110: Light emitting device, 110a: Light emitting Diode, 110b: light emitting diode, 112: conductive film, 112a: electrode, 112b: electrode, 113: semiconductor film, 113a: semiconductor layer, 113b: semiconductor layer, 114: light emitter, 114a: light emitting layer, 114b: light emitting layer, 115: Semiconductor film, 115a: Semiconductor layer, 115b: Semiconductor layer, 116a:
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Abstract
Description
図2は、表示装置の一例を示す断面図である。
図3A、図3Bは、表示装置の作製方法の一例を示す断面図である。
図4は、表示装置の作製方法の一例を示す断面図である。
図5は、表示装置の作製方法の一例を示す断面図である。
図6A、図6Bは、表示装置の作製方法の一例を示す断面図である。
図7A、図7Bは、表示装置の作製方法の一例を示す断面図である。
図8は、表示装置の一例を示す断面図である。
図9Aは、トランジスタの一例を示す上面図である。図9B~図9Dは、トランジスタの一例を示す断面図である。
図10は、画素の一例を示す回路図である。
図11A、図11Bは、電子機器の一例を示す図である。
図12A、図12Bは、電子機器の一例を示す図である。
図13A、図13Bは、電子機器の一例を示す図である。
図14A~図14Dは、電子機器の一例を示す図である。
図15A~図15Fは、電子機器の一例を示す図である。
本実施の形態では、本発明の一態様の表示装置について図1~図8を用いて説明する。
図1に、表示装置100Aの断面図を示す。図2に、表示装置100Bの断面図を示す。図3~図7に、表示装置100A及び表示装置100Bの作製方法を示す断面図を示す。以下では、表示装置100A及び100Bの、構成及び作製方法について説明する。
図8に示す表示装置100Cは、主に、トランジスタ120a、120bを有さない点で、図1に示す表示装置100Aと異なる。
本実施の形態では、本発明の一態様の表示装置に用いることができるトランジスタについて説明する。
図9A乃至図9Dに示すように、トランジスタ200は、絶縁体214上の絶縁体216と、絶縁体216に埋め込まれるように配置された導電体205(導電体205a、導電体205b、及び導電体205c)と、絶縁体216上、及び導電体205上の絶縁体222と、絶縁体222上の絶縁体224と、絶縁体224上の酸化物230aと、酸化物230a上の酸化物230bと、酸化物230b上の酸化物243(酸化物243a及び酸化物243b)と、酸化物243a上の導電体242aと、導電体242a上の絶縁体271aと、酸化物243b上の導電体242bと、導電体242b上の絶縁体271bと、酸化物230b上の絶縁体250(絶縁体250a及び絶縁体250b)と、絶縁体250上に位置し、酸化物230bの一部と重なる導電体260(導電体260a及び導電体260b)と、絶縁体222、絶縁体224、酸化物230a、酸化物230b、酸化物243a、酸化物243b、導電体242a、導電体242b、絶縁体271a、及び絶縁体271bを覆って配置される絶縁体275と、を有する。
次に、トランジスタに用いることができる金属酸化物(酸化物半導体ともいう)について説明する。
酸化物半導体の結晶構造としては、アモルファス(completely amorphousを含む)、CAAC(c−axis−aligned crystalline)、nc(nanocrystalline)、CAC(cloud−aligned composite)、単結晶(single crystal)、及び多結晶(poly crystal)等が挙げられる。
なお、酸化物半導体は、構造に着目した場合、上記とは異なる分類となる場合がある。例えば、酸化物半導体は、単結晶酸化物半導体と、それ以外の非単結晶酸化物半導体と、に分けられる。非単結晶酸化物半導体としては、例えば、上述のCAAC−OS、及びnc−OSがある。また、非単結晶酸化物半導体には、多結晶酸化物半導体、擬似非晶質酸化物半導体(a−like OS:amorphous−like oxide semiconductor)、非晶質酸化物半導体、などが含まれる。
CAAC−OSは、複数の結晶領域を有し、当該複数の結晶領域はc軸が特定の方向に配向している酸化物半導体である。なお、特定の方向とは、CAAC−OS膜の厚さ方向、CAAC−OS膜の被形成面の法線方向、またはCAAC−OS膜の表面の法線方向である。また、結晶領域とは、原子配列に周期性を有する領域である。なお、原子配列を格子配列とみなすと、結晶領域とは、格子配列の揃った領域でもある。さらに、CAAC−OSは、a−b面方向において複数の結晶領域が連結する領域を有し、当該領域は歪みを有する場合がある。なお、歪みとは、複数の結晶領域が連結する領域において、格子配列の揃った領域と、別の格子配列の揃った領域と、の間で格子配列の向きが変化している箇所を指す。つまり、CAAC−OSは、c軸配向し、a−b面方向には明らかな配向をしていない酸化物半導体である。
nc−OSは、微小な領域(例えば、1nm以上10nm以下の領域、特に1nm以上3nm以下の領域)において原子配列に周期性を有する。別言すると、nc−OSは、微小な結晶を有する。なお、当該微小な結晶の大きさは、例えば、1nm以上10nm以下、特に1nm以上3nm以下であることから、当該微小な結晶をナノ結晶ともいう。また、nc−OSは、異なるナノ結晶間で結晶方位に規則性が見られない。そのため、膜全体で配向性が見られない。従って、nc−OSは、分析方法によっては、a−like OS及び/または非晶質酸化物半導体と区別が付かない場合がある。例えば、nc−OS膜に対し、XRD装置を用いて構造解析を行うと、θ/2θスキャンを用いたOut−of−plane XRD測定では、結晶性を示すピークが検出されない。また、nc−OS膜に対し、ナノ結晶よりも大きいプローブ径(例えば50nm以上)の電子線を用いる電子線回折(制限視野電子線回折ともいう。)を行うと、ハローパターンのような回折パターンが観測される。一方、nc−OS膜に対し、ナノ結晶の大きさと近いかナノ結晶より小さいプローブ径(例えば1nm以上30nm以下)の電子線を用いる電子線回折(ナノビーム電子線回折ともいう。)を行うと、ダイレクトスポットを中心とするリング状の領域内に複数のスポットが観測される電子線回折パターンが取得される場合がある。
a−like OSは、nc−OSと非晶質酸化物半導体との間の構造を有する酸化物半導体である。a−like OSは、鬆または低密度領域を有する。即ち、a−like OSは、nc−OS及びCAAC−OSと比べて、結晶性が低い。また、a−like OSは、nc−OS及びCAAC−OSと比べて、膜中の水素濃度が高い。
次に、上述のCAC−OSの詳細について、説明を行う。なお、CAC−OSは材料構成に関する。
CAC−OSとは、例えば、金属酸化物を構成する元素が、0.5nm以上10nm以下、好ましくは、1nm以上3nm以下、またはその近傍のサイズで偏在した材料の一構成である。なお、以下では、金属酸化物において、一つまたは複数の金属元素が偏在し、該金属元素を有する領域が、0.5nm以上10nm以下、好ましくは、1nm以上3nm以下、またはその近傍のサイズで混合した状態をモザイク状、またはパッチ状ともいう。
本実施の形態では、本発明の一態様の表示装置について、図10を用いて説明する。
本実施の形態では、本発明の一態様の電子機器について、図11~図15を用いて説明する。
Claims (21)
- トランジスタ、発光ダイオード、第1の導電層、第2の導電層、第1の絶縁層、及び、第2の絶縁層を有し、
前記トランジスタは、前記第1の導電層と電気的に接続され、
前記第1の導電層は、前記トランジスタ上に位置し、
前記第1の絶縁層は、前記トランジスタ上に位置し、
前記第2の導電層は、前記第1の導電層上に位置し、
前記第2の絶縁層は、前記第1の絶縁層上に位置し、
前記発光ダイオードは、前記第2の絶縁層上の第1の電極と、前記第1の電極上の発光層と、前記発光層上の第2の電極と、を有し、
前記第2の電極は、前記第2の導電層と電気的に接続され、
前記第1の導電層の前記第2の導電層側の面の高さは、前記第1の絶縁層の前記第2の絶縁層側の面の高さと概略一致し、
前記第1の絶縁層と前記第2の絶縁層とは、直接接合しており、
前記第2の導電層は、前記第2の絶縁層の開口内部に位置し、かつ、前記第1の導電層と電気的に接続されている、表示装置。 - 請求項1において、
さらに、第3の絶縁層及び第4の絶縁層を有し、
前記第3の絶縁層は、前記トランジスタと前記第1の絶縁層との間に位置し、
前記第4の絶縁層は、前記発光ダイオードと前記第2の絶縁層との間に位置し、
前記第1の絶縁層及び前記第2の絶縁層は、それぞれ、酸化シリコン膜を有し、
前記第3の絶縁層及び前記第4の絶縁層は、それぞれ、酸化アルミニウム膜、酸化ハフニウム膜、及び、窒化シリコン膜のうち少なくとも一つを有する、表示装置。 - 請求項1または2において、
さらに、第5の絶縁層を有し、
前記トランジスタは、金属酸化物層、及びゲート電極を有し、
前記金属酸化物層は、チャネル形成領域を有し、
前記ゲート電極の上面の高さは、前記第5の絶縁層の上面の高さと概略一致している、表示装置。 - 請求項1または2において、
さらに、第5の絶縁層を有し、
前記トランジスタは、金属酸化物層、ゲート絶縁層、ゲート電極、第3の導電層、及び第4の導電層を有し、
前記金属酸化物層は、チャネル形成領域を有し、
前記金属酸化物層は、前記第3の導電層と重なる第1の領域と、前記第4の導電層と重なる第2の領域と、前記第1の領域と前記第2の領域の間の第3の領域と、を有し、
前記第3の導電層及び前記第4の導電層は、前記金属酸化物層上に互いに離間して位置し、
前記第5の絶縁層は、前記第3の導電層上及び前記第4の導電層上に位置し、
前記第5の絶縁層は、前記第3の領域と重なる開口を有し、
前記ゲート絶縁層は、前記開口の内側に位置し、かつ、前記第5の絶縁層の側面及び前記第3の領域の上面と重なり、
前記ゲート電極は、前記開口の内側に位置し、かつ、前記ゲート絶縁層を介して、前記第5の絶縁層の側面及び前記第3の領域の上面と重なる、表示装置。 - 請求項1乃至4のいずれか一において、
さらに、駆動回路を有し、
前記駆動回路は、回路用トランジスタを有し、
前記回路用トランジスタは、半導体基板にチャネル形成領域を有し、
前記トランジスタ、前記発光ダイオード、前記第1の導電層、前記第2の導電層、前記第1の絶縁層、及び、前記第2の絶縁層は、それぞれ、前記半導体基板上に位置する、表示装置。 - 請求項1乃至4のいずれか一において、
前記トランジスタは、半導体基板にチャネル形成領域を有する、表示装置。 - 請求項6において、
前記半導体基板は、シリコン基板である、表示装置。 - 請求項1乃至7のいずれか一において、
前記発光ダイオードは、マイクロ発光ダイオードである、表示装置。 - 請求項1乃至8のいずれか一において、
前記発光ダイオードは、第13族元素及び第15族元素を含む化合物を有する、表示装置。 - 請求項1乃至9のいずれか一において、
前記発光ダイオードは、窒化ガリウムを有する、表示装置。 - 請求項1乃至10のいずれか一において、
さらに、機能層を有し、
前記機能層は、前記発光ダイオード上に位置し、
前記発光ダイオードが発する光は、前記機能層を介して、前記表示装置の外部に取り出され、
前記機能層は、着色層及び色変換層の一方又は双方を有する、表示装置。 - 請求項1乃至11のいずれか一に記載の表示装置と、
光学部材と、
フレームと、
筐体と、を有し、
前記筐体は、タッチセンサを有する、電子機器。 - 請求項1乃至11のいずれか一に記載の表示装置と、
コネクタ及び集積回路のうち少なくとも一方と、を有する、表示モジュール。 - 請求項12に記載の表示モジュールと、
アンテナ、バッテリ、筐体、カメラ、スピーカ、マイク、及び操作ボタンのうち少なくとも一つと、を有する、電子機器。 - 第1の基板上に、複数のトランジスタを形成し、
前記複数のトランジスタ上に、それぞれ前記複数のトランジスタの少なくとも一つと電気的に接続される複数の第1の導電層を形成し、
前記複数のトランジスタ上に、第1の絶縁層を形成し、
第2の基板上に、導電膜、第1の半導体膜、発光体、第2の半導体膜、及び、第2の絶縁層を、この順で形成し、
前記第1の絶縁層と前記第2の絶縁層とを直接接合させることで、前記第1の基板と前記第2の基板とを貼り合わせ、
前記第2の基板を前記第1の基板から剥離し、
前記導電膜、前記第1の半導体膜、前記発光体、及び、前記第2の半導体膜を加工することで、複数の第1の電極、複数の第1の半導体層、複数の発光層、及び、複数の第2の半導体層をマトリクス状に形成し、
前記第2の絶縁層に、それぞれ前記複数の第1の導電層の少なくとも一つに達する、複数の開口を形成し、
それぞれ前記複数の開口の少なくとも一つの内部に位置する、複数の第2の導電層を形成し、
それぞれ、前記複数の第2の半導体層の少なくとも一つ、及び、前記複数の第2の導電層の少なくとも一つと電気的に接続される、複数の第2の電極を形成することで、複数の発光ダイオードを形成する、表示装置の作製方法。 - 請求項15において、
前記複数のトランジスタを形成する工程には、少なくとも1回の平坦化処理を用いる、表示装置の作製方法。 - 請求項15または16において、
第3の基板上に、着色層、色変換層、及びタッチセンサのうち少なくとも一つを形成し、
前記複数の発光ダイオード上に、前記第3の基板を貼り合わせる、表示装置の作製方法。 - 請求項15または16において、
前記複数の発光ダイオードの少なくとも一つの上に、着色層、色変換層、及びタッチセンサのうち少なくとも一つを形成する、表示装置の作製方法。 - 請求項15乃至18のいずれか一において、
前記複数の発光ダイオードの少なくとも一つは、マイクロ発光ダイオードである、表示装置の作製方法。 - 請求項15乃至19のいずれか一において、
前記複数のトランジスタの少なくとも一つは、チャネル形成領域に金属酸化物を有する、表示装置の作製方法。 - 請求項15乃至20のいずれか一において、
前記複数のトランジスタの少なくとも一つは、チャネル形成領域にシリコンを有する、表示装置の作製方法。
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| US17/772,195 US12356779B2 (en) | 2019-11-21 | 2020-11-09 | Display unit, display module, electronic device, and method for manufacturing the display unit |
| CN202080077275.9A CN114641816A (zh) | 2019-11-21 | 2020-11-09 | 显示装置、显示模块、电子设备及显示装置的制造方法 |
| JP2021558029A JP7609800B2 (ja) | 2019-11-21 | 2020-11-09 | 表示装置の作製方法 |
| JP2024223735A JP2025031798A (ja) | 2019-11-21 | 2024-12-19 | 表示装置 |
| US19/233,197 US20250301835A1 (en) | 2019-11-21 | 2025-06-10 | Display unit, display module, electronic device, and method for manufacturing the display unit |
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| CN115083278B (zh) * | 2022-06-24 | 2024-07-16 | 维沃移动通信有限公司 | 显示组件和电子设备 |
| TW202404025A (zh) * | 2022-07-12 | 2024-01-16 | 聯華電子股份有限公司 | 發光二極體結構及其製作方法 |
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| US12356779B2 (en) | 2025-07-08 |
| JP7609800B2 (ja) | 2025-01-07 |
| CN114641816A (zh) | 2022-06-17 |
| KR20220104165A (ko) | 2022-07-26 |
| JPWO2021099880A1 (ja) | 2021-05-27 |
| JP2025031798A (ja) | 2025-03-07 |
| US20220406981A1 (en) | 2022-12-22 |
| US20250301835A1 (en) | 2025-09-25 |
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