CN111092111A - Display panel, preparation method of display panel and display device - Google Patents
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- 239000000758 substrate Substances 0.000 claims abstract description 95
- 230000000149 penetrating effect Effects 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims description 21
- 239000007924 injection Substances 0.000 claims description 21
- 239000000969 carrier Substances 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 239000002800 charge carrier Substances 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 230000000903 blocking effect Effects 0.000 claims description 11
- 239000003086 colorant Substances 0.000 claims description 9
- 230000000295 complement effect Effects 0.000 claims description 7
- 239000010410 layer Substances 0.000 description 264
- 230000005525 hole transport Effects 0.000 description 13
- 230000000694 effects Effects 0.000 description 10
- 239000002346 layers by function Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
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- 239000000203 mixture Substances 0.000 description 1
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- 125000005259 triarylamine group Chemical group 0.000 description 1
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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Abstract
The invention discloses a display panel, a preparation method of the display panel and a display device. The display panel includes: a substrate; the pixel definition layer is positioned on one side of the substrate and comprises a pixel opening penetrating through the thickness of the pixel definition layer, the pixel opening comprises a first sub opening and a second sub opening which are communicated with each other along the thickness direction of the pixel definition layer, the first sub opening is positioned on one side close to the substrate, and the second sub opening is positioned on one side of the first sub opening, which is deviated from the substrate; and the at least one first carrier layer comprises a first part and a second part which are separated from each other, the first part is positioned in the first sub-opening, and the second part is positioned on the inner surface of the second sub-opening. The display panel provided by the invention can avoid current crosstalk between adjacent sub-pixels.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a preparation method of the display panel and a display device.
Background
Organic Light Emitting Diode (OLED) display has the advantages of low cost, wide viewing angle, low driving voltage, fast response speed, rich Light Emitting colors, simple preparation process, capability of realizing large-area flexible display and the like, and is considered to be one of the display technologies with the greatest development prospects.
In the process of manufacturing the OLED display panel, functional layers such as a hole injection layer, a hole transport layer, a hole blocking layer, and an electron blocking layer located on both sides of the light emitting layer are usually evaporated by using a common mask, and these functional layers connect the sub-pixels in a direction parallel to the display panel. When some sub-pixels are lighted, current is transmitted to adjacent sub-pixels in a transverse direction, so that other sub-pixels emit light, and therefore, the adjacent sub-pixels are interfered with each other, and the display effect is influenced.
Disclosure of Invention
Embodiments of the present invention provide a display panel, a method for manufacturing the display panel, and a display device, which can prevent a carrier from moving to another adjacent sub-pixel to cause the other sub-pixel to emit light, and can improve a display effect.
In one aspect, an embodiment of the present invention provides a display panel, including: a substrate; the pixel definition layer is positioned on one side of the substrate and comprises a pixel opening penetrating through the thickness of the pixel definition layer, the pixel opening comprises a first sub opening and a second sub opening which are communicated with each other along the thickness direction of the pixel definition layer, the first sub opening is positioned on one side of the substrate, and the second sub opening is positioned on one side of the first sub opening, which is deviated from the substrate; and the at least one first carrier layer comprises a first part and a second part which are separated from each other, the first part is positioned in the first sub-opening, and the second part is positioned on the inner surface of the second sub-opening.
According to an aspect of an embodiment of the present invention, the display panel further includes: a first electrode between a first portion of the at least one first charge carrier layer and the substrate, the first electrode exposed to the pixel opening; and the light-emitting layer is positioned in the pixel opening and positioned on one side of the first part of the at least one first carrier layer, which faces away from the first electrode.
According to an aspect of an embodiment of the present invention, the display panel further includes: the second electrode layer is positioned on one side of the light-emitting layer, which is far away from the substrate, and the second electrode layer is of a continuous structure; optionally, the display panel further includes at least one second carrier layer, where the at least one second carrier layer is located between the light emitting layer and the second electrode layer, and the at least one second carrier layer is a continuous structure.
According to an aspect of the embodiments of the present invention, the light emitting layer includes a plurality of kinds of light emitting units having different emission colors, each of the light emitting units corresponds to one of the pixel openings, and the first sub-openings of the pixel openings corresponding to the different kinds of light emitting units have different depths in the thickness direction of the display panel.
According to an aspect of the embodiments of the present invention, a compensation structure is disposed between the first portion of the at least one first carrier layer and the light emitting layer, the compensation structure including a plurality of kinds of compensation units corresponding to the plurality of kinds of light emitting units, respectively; optionally, in the same pixel opening, the total thickness of the light emitting unit, the compensation unit, and the at least one first carrier layer is greater than or equal to the depth of the first sub-opening.
According to an aspect of an embodiment of the present invention, the display panel further includes: the second electrode layer is positioned on one side of the light-emitting layer, which is far away from the substrate; the at least one second carrier layer is positioned between the light emitting layer and the second electrode layer and comprises a third part and a fourth part which are separated from each other, the third part is positioned in the first sub-opening, and the fourth part is positioned on the inner surface of the second sub-opening; optionally, in the same pixel opening, a total thickness of at least one first carrier layer, the compensation unit, the light emitting unit, and at least one second carrier layer along the thickness direction of the display panel is greater than or equal to a depth of the first sub-opening.
According to an aspect of the embodiments of the present invention, the at least one first carrier layer includes at least one of a first carrier injection layer, a first carrier transport layer, and a second carrier blocking layer, and the at least one second carrier layer includes at least one of a second carrier injection layer, a second carrier transport layer, and a first carrier blocking layer, wherein one of the first carrier and the second carrier is a hole and the other is an electron.
According to an aspect of the embodiments of the present invention, an interface is provided between the first sub opening and the second sub opening, the first sub opening includes a first inner circumferential surface, the first inner circumferential surface is connected to a surface of the first electrode facing away from the substrate and the interface, and a complementary angle between the first inner circumferential surface of the first sub opening and the surface of the first electrode facing away from the substrate is greater than or equal to 90 ° along a longitudinal section of the display panel; optionally, a supplementary angle between a first inner peripheral surface of the first sub-opening and a surface of the first electrode facing away from the substrate is greater than or equal to 90 ° and less than or equal to 120 °; optionally, the second sub-opening includes an annular second inner peripheral surface, the second inner peripheral surface is connected to the interface and a surface of the pixel defining layer facing away from the substrate, and a supplementary angle between the second inner peripheral surface of the second sub-opening and the surface of the first electrode facing away from the substrate is smaller than 90 ° along a longitudinal cross section of the display panel; optionally, a supplementary angle between a second inner circumferential surface of the second sub-opening and a surface of the first electrode facing away from the substrate is greater than or equal to 60 ° and less than or equal to 80 °; optionally, the depth of the second sub-opening in the thickness direction of the display panel is 3-12 times that of the first sub-opening in the thickness direction of the display panel; optionally, the depth of the first sub-opening in the thickness direction of the display panel is 1 to 2.5 times the total thickness of the at least one first current carrier layer.
On the other hand, the embodiment of the invention also provides a preparation method of the display panel, which comprises the following steps: forming a pixel defining layer on one side of the substrate, wherein the pixel defining layer comprises a pixel opening penetrating through the thickness of the pixel defining layer, the pixel opening comprises a first sub opening and a second sub opening which are communicated with each other along the thickness direction of the pixel defining layer, the first sub opening is positioned on one side close to the substrate, and the second sub opening is positioned on one side of the first sub opening, which is far away from the substrate; and forming at least one first carrier layer on the substrate and the surface of the pixel definition layer, which faces away from the substrate, wherein the first carrier layer comprises a first part positioned in the first sub-opening and a second part positioned on the surface of the pixel definition layer, which faces away from the substrate, and the inner surface of the second sub-opening, and the first part and the second part are separated from each other.
In another aspect, an embodiment of the present invention further provides a display device, which includes the display panel described above.
According to the display panel, the preparation method of the display panel and the display device provided by the embodiment of the invention, the display panel comprises a substrate, a pixel definition layer and at least one first current carrier layer, wherein the pixel definition layer comprises a pixel opening penetrating through the thickness of the pixel definition layer, and the pixel opening is used for manufacturing a functional film layer for luminous display. The pixel opening comprises a first sub opening and a second sub opening which are communicated with each other along the thickness direction of the pixel definition layer, the at least one first carrier layer is located on one side, away from the substrate, of the pixel definition layer, and the at least one first carrier layer comprises a first portion located in the first sub opening and a second portion located on the inner surface of the second sub opening, and the first portion and the second portion are separated from each other, so that when the pixel circuit drives the corresponding sub pixel to emit light, carriers are disconnected at the separation position of the first portion and the second portion when moving transversely, the carriers only move transversely in the at least one first carrier layer located in the first sub opening, and therefore the phenomenon that the carriers move to other adjacent sub pixels to cause the light emission of the other sub pixels is effectively avoided, the display effect of the display panel is improved, and the situations that a display picture has color cast and the like are avoided.
Drawings
Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof, and which are not to scale.
FIG. 1 is a top view of a display panel provided in accordance with one embodiment of the present invention;
FIG. 2 is a schematic view of a structure of a substrate, a pixel defining layer and a first electrode in combination according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of the cooperation of the first electrode, the pixel defining layer and the first carrier layer according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of the first display panel shown in FIG. 1 taken along the A-A direction;
fig. 5 is a sectional view of the second display panel shown in fig. 1 taken along a-a direction;
fig. 6 is a sectional view of the third display panel shown in fig. 1 taken along a-a direction;
fig. 7 is a schematic flow chart of a method for manufacturing a display panel according to an embodiment of the invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The display panel, the method for manufacturing the display panel, and the display device according to the embodiment of the invention are described in detail below with reference to fig. 1 to 7. Some well-known structures are shown hidden or transparently in the figure for the sake of clarity in illustrating the structures associated with the present invention.
Referring to fig. 1 to 6 together, fig. 1 is a schematic top view structure of a display panel according to an embodiment of the present invention, fig. 2 is a schematic structure diagram illustrating a substrate, a pixel defining layer and a first electrode according to an embodiment of the present invention, fig. 3 is a schematic structure diagram illustrating a first electrode, a pixel defining layer and a first carrier layer according to an embodiment of the present invention, fig. 4 is a cross-sectional view of the first display panel shown in fig. 1 along a-a direction, fig. 5 is a cross-sectional view of the second display panel shown in fig. 1 along a-a direction, and fig. 6 is a cross-sectional view of the third display panel shown in fig. 1 along a-a direction. The display panel 100 has a plurality of sub-pixels 30 arranged in an array.
An embodiment of the invention provides a display panel 100, which includes a substrate 10, a pixel defining layer 20, and at least one first carrier layer 32. At least one first charge carrier layer 32 defines a film structure that may include at least one layer in first charge carrier layer 32, and specifically, may include a film structure, and may also include two or more film structures.
The substrate 10 may be an array substrate including a device layer, among others. The device layer may include pixel circuitry for driving the display of each sub-pixel 30.
The pixel defining layer 20 is located on one side of the substrate 10, the pixel defining layer 20 includes a pixel opening 21 penetrating through the thickness of the pixel defining layer 20, the pixel opening 21 includes a first sub-opening 211 and a second sub-opening 212 communicating with each other along the thickness direction of the pixel defining layer 20, the first sub-opening 211 is located on one side close to the substrate 10, and the second sub-opening 212 is located on one side of the first sub-opening 211 facing away from the substrate 10. The at least one first charge carrier layer 32 includes a first portion 32a and a second portion 32b separated from each other, the first portion 32a is located in the first sub-opening 211, the second portion 32b is located on an inner surface of the second sub-opening 212, and the second portion 32b may also be located on a surface of the pixel defining layer 20 facing away from the substrate 10.
In some embodiments, the display panel 100 further includes a first electrode 31 and a light emitting layer 34. The first electrode 31 is located between the first portion 32a of the at least one first carrier layer 32 and the substrate 10, and the first electrode 31 is exposed to the pixel opening 21. The light-emitting layer 34 is located within the pixel opening 21 and on a side of the first portion 32a of the at least one first carrier layer 32 facing away from the first electrode 31.
The pixel aperture 21 of the pixel defining layer 20 defines a light emitting region of the display panel 100, that is, a position of each sub-pixel 30, and the structure located in the pixel aperture 21 is used for realizing display of the display panel 100.
In the display panel 100 provided in the embodiment of the present invention, the at least one first carrier layer 32 is located between the first electrode 31 and the light emitting layer 34, and since the at least one first carrier layer 32 includes the first portion 32a located in the first sub-opening 211 and the second portion 32b located on the surface of the pixel defining layer 20 facing away from the substrate 10 and the inner surface of the second sub-opening 212, and the first portion 32a and the second portion 32b are separated from each other, when the pixel circuit drives the corresponding sub-pixel 30 to emit light, carriers are disconnected at the separation point of the first portion 32a and the second portion 32b when moving laterally, so that the carriers only move laterally in the first carrier layer 32 located in the first sub-opening 211, and the carriers are effectively prevented from moving to other adjacent sub-pixels 30 to cause the other sub-pixels 30 to emit light, thereby improving the display effect of the display panel 100.
In some embodiments, a cross-sectional dimension of the first sub-opening 211 parallel to the substrate 10 is less than or equal to a cross-sectional dimension of the second sub-opening 212 parallel to the substrate 10. By reasonably setting the sizes of the first sub-opening 211 and the second sub-opening 212, the pixel opening 21 can be easily manufactured, and the mutual crosstalk between the adjacent sub-pixels 30 can be effectively prevented.
In some embodiments, the display panel 100 further includes a second electrode layer 36, the second electrode layer 36 is located on a side of the light emitting layer 34 facing away from the substrate 10, and the second electrode layer 36 is a continuous structure. By providing the continuous second electrode layer 36, the display panel 100 can be manufactured easily, and power can be supplied to the second electrode layer 36 easily when the display panel 100 performs power on display. In a specific implementation, since the second electrode layer 36 has a continuous structure, it can be fabricated using a common mask (common mask), thereby improving the fabrication efficiency of the display panel 100.
Alternatively, the second electrode layer 36 may have a discontinuous structure as long as it can be connected to the light emitting layer 34 and can supply a voltage signal to the plurality of sub-pixels.
One of the first electrode 31 and the second electrode layer 36 is an anode layer, and the other is a cathode layer. Here, the first electrode 31 is taken as an anode layer, and the second electrode layer 36 is taken as a cathode layer.
It is understood that, herein, the "functional layer" refers to a functional layer related to carriers in the sub-pixel 30, and includes, but is not limited to, a layer structure that performs functions of carrier injection, carrier transport, or carrier blocking.
Referring to fig. 4 and fig. 5, in order to better realize the display of the display panel 100, in some embodiments, the display panel 100 further includes at least one second carrier layer 35, the at least one second carrier layer 35 is located between the light emitting layer 34 and the second electrode layer 36, and the at least one second carrier layer 35 is a continuous structure. At least one second carrier layer 35 defines a film structure that may include one layer in the second carrier layer 35, and may also include two or more layers.
By arranging at least one continuous second carrier layer 35 between the light-emitting layer 34 and the second electrode layer 36, when the second electrode layer 36 is powered on, the second carrier layer 35 can provide carriers for the light-emitting layer 34 or block the carriers, so that the light-emitting layer 34 can emit light better. Meanwhile, the second carrier layer 35 is of a continuous structure, so that a continuous second electrode layer 36 can be conveniently manufactured above the second carrier layer 35, and the situation that the second electrode layer 36 is discontinuous is avoided.
In some embodiments, the plurality of sub-pixels 30 in the display panel 100 include sub-pixels having different emission colors to realize color display of the display panel 100. Optionally, the light emitting layer 34 includes a plurality of light emitting units with different light emitting colors, each light emitting unit corresponds to one of the pixel openings 21, and the first sub-openings 211 of the pixel openings 21 corresponding to different types of light emitting units have different depths along the thickness direction of the display panel 100. Optionally, in order to realize that the sub-pixels 30 with different emission colors can be better matched to realize display, the thicknesses of the light emitting units or the micro-cavities corresponding to the sub-pixels 30 with different emission colors are different, and therefore, by setting the depths of the first sub-openings 211 corresponding to different kinds of light emitting units along the thickness direction of the display panel 100 to be different, not only can at least one first carrier layer 32 between adjacent sub-pixels 30 be disconnected from each other, but also the situation that the second electrode layer 36 is discontinuous can be effectively prevented. In some embodiments, the light emitting layer 34 includes a first light emitting unit 341 emitting blue light, a second light emitting unit 342 emitting red light, and a third light emitting unit 343 emitting green light, the thickness of the second light emitting unit 342 is greater than both the thickness of the third light emitting unit 343 and the thickness of the first light emitting unit 341, and the thickness of the third light emitting unit 343 is greater than the thickness of the first light emitting unit 341, accordingly, the depth of the first sub-opening 211 corresponding to the second light emitting unit 342 in the thickness direction of the display panel 100 is the largest, and the depth of the first sub-opening 211 corresponding to the third light emitting unit 343 is greater than the depth of the first sub-opening 211 corresponding to the first light emitting unit 341. With the above arrangement, at least one of the first carrier layers 32 between adjacent sub-pixels 30 is disconnected from each other, and the second electrode layer 36 is prevented from being discontinuous.
In some embodiments, at least one first carrier layer 32 between adjacent sub-pixels 30 is fabricated simultaneously, and the film thickness of the first carrier layer 32 is uniform, so that the depths of the first sub-openings 211 of the pixel openings 21 corresponding to different types of light emitting units along the thickness direction of the display panel 100 may be the same, and at this time, the at least one first carrier layer 32 can be broken and the light emitting layer 34 can be located in the second sub-opening 212, so as to prevent the display viewing angle from being affected.
In some embodiments, a compensation structure 33 is disposed between the first portion 32a of the first carrier layer 32 and the light emitting layer 34, optionally, the compensation structure 33 is located in the first sub-opening 211, and the compensation structure 33 includes a plurality of compensation units corresponding to the plurality of light emitting units, respectively. By providing a plurality of compensation units, the microcavity of the sub-pixel 30 corresponding to the compensation unit can be adjusted, thereby improving the display effect.
The compensation unit can be made of a triarylamine material to better adjust the microcavity of the sub-pixel 30.
In some embodiments, in the same pixel opening 21, the total thickness of the light emitting unit, the compensation unit and the at least one first carrier layer 32 is greater than or equal to the depth of the first sub-opening 211. Through the arrangement, on one hand, the depth of the first sub-opening 211 can be set reasonably, so that the surface of the light-emitting unit, which is away from the substrate 10, can be located in the second sub-opening 212, and a continuous film structure can be formed on the functional film layer manufactured in the post-production process of the light-emitting unit. For example, when the display panel 100 includes at least one second carrier layer 35 and the second electrode layer 36, since the total thickness of the light emitting unit, the compensation unit and the at least one first carrier layer 32 is greater than or equal to the depth of the first sub-opening 211, the at least one second carrier layer 35 and the second electrode layer 36 in the adjacent sub-pixels 30 are continuous with each other, and the manufacturing process of the display panel 100 is simplified.
In some embodiments, the light emitting layer 34 includes a first light emitting unit 341, a second light emitting unit 342, and a third light emitting unit 343 which emit different colors, and correspondingly, a first compensation unit 331 is disposed between the first portion 32a of the first carrier layer 32 and the first light emitting unit 341, a second compensation unit 332 is disposed between the first portion 32a of the first carrier layer 32 and the second light emitting unit 342, and a third compensation unit 333 is disposed between the first portion 32a of the first carrier layer 32 and the third light emitting unit 343. By reasonably setting the thicknesses of the first compensation unit 331, the second compensation unit 332 and the third compensation unit 333, the microcavity of the corresponding sub-pixel 30 can be adjusted, and the light emitting efficiency of the corresponding sub-pixel 30 is improved.
When the first light emitting unit 341 is capable of emitting blue light, the second light emitting unit 342 is capable of emitting red light, and the third light emitting unit 343 is capable of emitting green light, since wavelengths of different colors are different, alternatively, the thickness of the second compensation unit 332 may be set to be greater than the thickness of the third compensation unit 333 and the thickness of the first compensation unit 331, respectively, and the thickness of the third compensation unit 333 is set to be greater than the thickness of the first compensation unit 331, so as to adjust the microcavity of the corresponding sub-pixel 30.
Referring to fig. 6, in some embodiments, when the display panel 100 includes the second electrode layer 36 and at least one second carrier layer 35 on a side of the light emitting layer 34 facing away from the substrate 10, the at least one second carrier layer 35 is located between the light emitting layer 34 and the second electrode layer 36, the at least one second carrier layer 35 includes a third portion 35a and a fourth portion 35b separated from each other, the third portion 35a is located in the first sub-opening 211, the fourth portion 35b is located in the fourth portion 35b on an inner surface of the second sub-opening 212, and the fourth portion 35b may also be located on a surface of the pixel defining layer 20 facing away from the substrate 10. Through the arrangement, at least one second carrier layer 35 in the adjacent sub-pixels 30 is also disconnected, so that when the sub-pixels 30 are powered on, carriers move to other adjacent sub-pixels 30 to cause the other sub-pixels 30 to emit light, the display effect of the display panel 100 is improved, and the situations of color cast and the like of a display picture are avoided.
Optionally, in the same pixel opening 21, the total thickness of at least one first carrier layer 32, the compensation unit, the light emitting unit, and at least one second carrier layer 35 along the thickness direction of the display panel 100 is greater than or equal to the depth of the first sub-opening 211. With the above arrangement, on the one hand, current crosstalk between adjacent sub-pixels 30 during display can be avoided, and on the other hand, the functional film layer formed after the at least one second carrier layer 35 forms a continuous structure, for example, the second electrode layer 36 formed after the at least one second carrier layer 35 forms a continuous structure.
In some embodiments, the at least one first carrier layer 32 includes at least one of a first carrier injection layer, a first carrier transport layer, and a second carrier blocking layer, and the at least one second carrier layer 35 includes at least one of a second carrier injection layer, a second carrier transport layer, and a first carrier blocking layer, wherein one of the first and second carriers is a hole and the other is an electron.
In an implementation, referring to fig. 5, at least one first carrier Layer 32 includes Hole injection layers 321a and 321b (HIL) and Hole transport layers 322a and 322b (HTL) stacked in a direction away from the substrate 10. The second carrier Layer 35 includes a Hole Blocking Layer 351 (HBL), an Electron transport Layer 352 (ETL), and an Electron injection Layer 353 (EIL) stacked in a direction away from the substrate 10. At this time, the first portion 32a of the first charge carrier layer 32 includes a hole injection layer 321a and a hole transport layer 322a, and the second portion 32b of the first charge carrier layer 32 includes a hole injection layer 321b and a hole transport layer 322b, as shown in fig. 5, the hole injection layer 321a and the hole injection layer 321b are separated from each other, and the hole transport layer 322a and the hole transport layer 322b are also separated from each other.
Meanwhile, the compensation unit is located on one side of the hole transport layer 322a away from the hole injection layer 321a, the light emitting unit is located on one side of the compensation unit away from the hole transport layer 322a, the opening in the thickness direction of the display panel 100 is formed by reasonably setting the first sub-opening 211, one side of the light emitting unit away from the compensation unit is located in the second opening, the hole blocking layer 351, the electron transport layer 352 and the electron injection layer 353 are continuous structures covering the pixel definition layer 20 and the second sub-opening 212, and the situation that the second electrode layer 36 is discontinuous is effectively avoided.
In some embodiments, an interface 213 is formed between the first sub-opening 211 and the second sub-opening 212, and the interface 213 is a plane formed by the intersection of the first sub-opening 211 and the second sub-opening 212. The first sub-opening 211 includes a ring-shaped first inner circumferential surface connected to a surface of the first electrode 31 facing away from the substrate 10 and the interface 213. In a longitudinal cross section of the display panel 100, a complementary angle between a first inner peripheral surface of the first sub-opening 211 and a surface of the first electrode 31 facing away from the substrate 10 is greater than or equal to 90 °. Optionally, a supplementary angle between the first inner peripheral surface of the first sub-opening 211 and the surface of the first electrode 31 facing away from the substrate 10 is greater than or equal to 90 ° and less than or equal to 120 °. By reasonably setting the shape of the first sub-opening 211, at least one first carrier layer 32, for example, the hole injection layer 321a and the hole transport layer 322a of the hole injection layers 321a and 321b and the hole transport layers 322a and 322b during manufacturing, can be located in the first sub-opening 211, the hole injection layer 321b and the hole transport layer 322b are located on the surface of the pixel defining layer 20 away from the substrate 10 and the inner surface of the second sub-opening 212, and the hole injection layer 321a and the hole injection layer 321b are disconnected from each other through the first sub-opening 211, and meanwhile, the hole transport layer 322a and the hole transport layer 322b are also disconnected from each other, so that mutual crosstalk of carriers between adjacent sub-pixels 30 during display is effectively prevented.
In specific implementation, the structures of the first sub-opening 211 and the second sub-opening 212 may be set according to the needs of a user, the structures of the first sub-opening 211 and the second sub-opening 212 may be both of a truncated pyramid structure or a cone structure, the side surfaces of the first sub-opening 211 and the second sub-opening 212 may be both of an annular structure, and the first sub-opening 211 and the second sub-opening 212 are coaxially disposed.
In order to enable the second electrode layer 36 or the at least one second carrier layer 35 to form a continuous film structure, the second sub-opening 212 includes a ring-shaped second inner circumferential surface, and the second inner circumferential surface is connected to the interface surface 213 and the surface of the pixel defining layer 20 facing away from the substrate 10. On a longitudinal section of the display panel 100, a complementary angle between a second inner circumferential surface of the second sub-opening 212 and a surface of the first electrode 31 facing away from the substrate 10 is smaller than 90 °; optionally, a complementary angle between the second inner peripheral surface of the same second sub-opening 212 and the surface of the first electrode 31 facing away from the substrate 10 is greater than or equal to 60 ° and less than or equal to 80 °, for example, the complementary angle between the second inner peripheral surface of the same second sub-opening 212 and the surface of the first electrode 31 facing away from the substrate 10 may be 60 °, 70 °, 75 °, or 80 °.
Optionally, the depth of the second sub-opening 212 in the thickness direction of the display panel 100 is 3 to 12 times the depth of the first sub-opening 211 in the thickness direction of the display panel 100. In some embodiments, the depth of the first sub-opening 211 along the thickness direction of the display panel 100 is 1 to 2.5 times the total thickness of the at least one first carrier layer 32. Through the reasonable depth that sets up between first sub-opening 211 and the second sub-opening 212, can set up reasonable sub-pixel 30 structure, the mutual interference of the luminous light of preventing between the adjacent sub-pixel 30 that simultaneously can be better improves display panel 100's display effect.
In a specific implementation, the size of the pixel opening 21 may be set according to a user's requirement, for example, the depth of the pixel opening 21 along the thickness direction of the display panel 100 may be between 1.2 micrometers and 1.6 micrometers, and the depth of the first sub-opening 211 along the thickness direction of the display panel 100 may be 1341 angstrom to 3352.5 angstrom. According to the embodiment of the present invention, the display panel 100 includes a substrate 10, a first electrode 31, a pixel defining layer 20, a light emitting layer 34, and at least one first carrier layer 32, wherein the pixel defining layer 20 includes a pixel opening 21 exposing the first electrode 31, and the pixel opening 21 is used for manufacturing a functional film layer for light emitting display. The pixel opening 21 comprises a first sub-opening 211 and a second sub-opening 212 which are mutually communicated along the thickness direction of the pixel defining layer 20, the light emitting layer 34 is positioned in the pixel opening 21 for light emitting display, the at least one first carrier layer 32 is positioned between the first electrode 31 and the light emitting layer 34, and since the at least one first carrier layer 32 comprises a first portion 32a positioned in the first sub-opening 211 and a second portion 32b positioned on the surface of the pixel defining layer 20 facing away from the substrate 10 and the inner surface of the second sub-opening 212, and the first portion 32a and the second portion 32b are separated from each other, when the pixel circuit drives the corresponding sub-pixel 30 to emit light, the carriers are disconnected at the separation position of the first portion 32a and the second portion 32b when moving transversely, so that the carriers only move transversely in the at least one first carrier layer 32 positioned in the first sub-opening 211, and the carriers are effectively prevented from moving towards the adjacent other sub-pixels 30 to cause the other sub-pixels 30 to emit light, therefore, the display effect of the display panel 100 is improved, and the situations of color cast and the like of the display picture are avoided.
Referring further to fig. 7, fig. 7 is a flow chart illustrating a method for manufacturing the display panel 100 according to an embodiment of the invention. The embodiment of the present invention further provides a method for manufacturing the display panel 100, where the method for manufacturing the display panel 100 includes:
s110, forming a pixel defining layer 20 on one side of the substrate 10, where the pixel defining layer 20 includes a pixel opening 21 penetrating the thickness of the pixel defining layer 20, the pixel opening 21 includes a first sub-opening 211 and a second sub-opening 212 communicating with each other along the thickness direction of the pixel defining layer 20, the first sub-opening 211 is located on one side close to the substrate 10, and the second sub-opening 212 is located on one side of the first sub-opening 211 facing away from the substrate 10.
S120, forming at least one first carrier layer 32 on the substrate 10 and on the surface of the pixel defining layer 20 facing away from the substrate 10, including forming a first portion 32a located in the first sub-opening 211 and a second portion 32b located on the surface of the pixel defining layer 20 facing away from the substrate 10 and the inner surface of the second sub-opening 212, where the first portion 32a and the second portion 32b are separated from each other.
The substrate 10 may be an array substrate including a device layer, and the pixel definition layer 20 is formed on a side close to the device layer. The device layer may include pixel circuitry for driving the display of each sub-pixel 30.
In the method for manufacturing the display panel 100 according to the embodiment of the invention, when at least one first carrier layer 32 is formed on the substrate 10 and on the surface of the pixel defining layer 20 away from the substrate 10, the at least one first charge carrier layer 32 includes a first portion 32a located within the first sub-opening 211 and a second portion 32b located at a surface of the pixel defining layer 20 facing away from the substrate 10 and an inner surface of the second sub-opening 212, and the first portion 32a and the second portion 32b are separated from each other, so that when the pixel circuit drives the corresponding sub-pixel 30 to emit light, the carriers break at the separation of the first portion 32a from the second portion 32b as they move laterally, the carriers only move laterally in the at least one first carrier layer 32 located in the first sub-opening 211, so that the carriers are effectively prevented from moving to other adjacent sub-pixels 30 to cause the other sub-pixels 30 to emit light, and the display effect of the display panel 100 is improved.
In some embodiments, the step S110 of forming the pixel defining layer 20 on the side of the substrate 10 includes first forming a first layer structure on the substrate 10, and then patterning a second sub-opening 212 on a side of the first layer structure facing away from the substrate 10. After the second sub-opening 212 is formed, curing treatment is performed on the surface of the first layer structure on the side away from the substrate 10, so that a hardened layer is formed on the side of the first layer structure away from the substrate 10, at this time, the first layer structure on the side, close to the substrate 10, of the hardened layer is still in an uncured state, then, the hardened layer on the first layer structure and the first layer structure on the side, close to the substrate 10, of the hardened layer are exposed by using a photomask, a first sub-opening 211 communicated with the second sub-opening 212 is formed, and at this time, the Taper angle (Taper) forming the first sub-opening 211 is greater than or equal to 90 °. At this time, the average size of the first sub-apertures 211 in a direction parallel to the display panel 100 decreases in a direction away from the substrate 10. Alternatively, the first sub-opening 211 may be formed by modifying the composition of the film structure of the pixel defining layer 20, for example, by making the film structure of the side of the pixel defining layer 20 away from the substrate harder.
In some embodiments, step S110, before forming the pixel defining layer 20 on one side of the substrate 10, may further include forming the first electrode 31 on the substrate 10, where the pixel opening 21 of the pixel defining layer 20 formed on the substrate 10 can expose the first electrode 31.
In another aspect, an embodiment of the invention further provides a display device, which includes the display panel 100. In some embodiments, the display device further includes at least one camera assembly for capturing external light to generate an image of a corresponding object, and the camera assembly is connected to the display panel 100, so that the display panel 100 displays the image generated by the camera assembly. The display device provided by the embodiment of the invention can avoid the phenomenon that other sub-pixels 30 emit light due to the movement of carriers to other adjacent sub-pixels 30, and can improve the display effect.
In accordance with the above embodiments of the present invention, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A display panel, comprising:
a substrate;
the pixel defining layer is positioned on one side of the substrate and comprises a pixel opening penetrating through the thickness of the pixel defining layer, the pixel opening comprises a first sub opening and a second sub opening which are communicated with each other along the thickness direction of the pixel defining layer, the first sub opening is positioned on one side close to the substrate, and the second sub opening is positioned on one side of the first sub opening, which is far away from the substrate;
at least one first charge carrier layer including a first portion and a second portion separated from each other, the first portion being located within the first sub-opening, the second portion being located inside the second sub-opening.
2. The display panel according to claim 1, characterized in that the display panel further comprises:
a first electrode between the first portion of the at least one first charge carrier layer and the substrate, the first electrode exposed to the pixel opening;
a light emitting layer within the pixel opening and on a side of the first portion of the at least one first charge carrier layer facing away from the first electrode.
3. The display panel according to claim 2, further comprising:
the second electrode layer is positioned on one side of the light-emitting layer, which is far away from the substrate, and the second electrode layer is of a continuous structure;
preferably, the display panel further includes at least one second carrier layer, the at least one second carrier layer is located between the light emitting layer and the second electrode layer, and the at least one second carrier layer is a continuous structure.
4. The display panel according to claim 2, wherein the light emitting layer includes a plurality of types of light emitting units having different emission colors, each of the light emitting units corresponds to the pixel opening one by one, and the first sub-openings of the pixel openings corresponding to the different types of light emitting units have different depths in a thickness direction of the display panel.
5. The display panel according to claim 4, wherein a compensation structure is disposed between the first portion of the at least one first charge carrier layer and the light emitting layer, the compensation structure including a plurality of kinds of compensation units corresponding to the plurality of kinds of light emitting units, respectively;
preferably, in the same pixel opening, a total thickness of the light emitting unit, the compensation unit and the at least one first carrier layer is greater than or equal to a depth of the first sub-opening.
6. The display panel according to claim 5, further comprising:
the second electrode layer is positioned on one side of the light-emitting layer, which is far away from the substrate;
at least one second carrier layer located between the light emitting layer and the second electrode layer, wherein the at least one second carrier layer comprises a third portion and a fourth portion which are separated from each other, the third portion is located in the first sub-opening, and the fourth portion is located on the inner surface of the second sub-opening;
preferably, in the same pixel opening, a total thickness of the at least one first charge carrier layer, the compensation unit, the light emitting unit, and the at least one second charge carrier layer in a thickness direction of the display panel is greater than or equal to a depth of the first sub-opening.
7. The display panel according to claim 3 or 6, wherein the at least one first carrier layer comprises at least one of a first carrier injection layer, a first carrier transport layer, and a second carrier blocking layer, wherein the at least one second carrier layer comprises at least one of a second carrier injection layer, a second carrier transport layer, and a first carrier blocking layer,
wherein one of the first and second carriers is a hole and the other is an electron.
8. The display panel according to any one of claims 2 to 6, wherein an interface is provided between the first sub-aperture and the second sub-aperture, the first sub-aperture includes a first inner circumferential surface having a ring shape, the first inner circumferential surface is connected to a surface of the first electrode facing away from the substrate and the interface, and a complementary angle between the first inner circumferential surface of the first sub-aperture and a surface of the first electrode facing away from the substrate is greater than or equal to 90 ° in a longitudinal cross section of the display panel;
preferably, a supplementary angle between the first inner peripheral surface of the first sub-opening and a surface of the first electrode facing away from the substrate is greater than or equal to 90 ° and less than or equal to 120 °;
preferably, the second sub-opening includes a second inner peripheral surface in an annular shape, the second inner peripheral surface is connected to the interface and a surface of the pixel defining layer facing away from the substrate, and a complementary angle between the second inner peripheral surface of the second sub-opening and the surface of the first electrode facing away from the substrate is smaller than 90 ° in a longitudinal cross section of the display panel;
preferably, a supplementary angle between the second inner peripheral surface of the second sub-opening and a surface of the first electrode facing away from the substrate is greater than or equal to 60 ° and less than or equal to 80 °;
preferably, the depth of the second sub-opening in the thickness direction of the display panel is 3-12 times that of the first sub-opening in the thickness direction of the display panel;
preferably, the depth of the first sub-opening in the thickness direction of the display panel is 1 to 2.5 times the total thickness of the at least one first carrier layer.
9. A method for manufacturing a display panel, comprising:
forming a pixel defining layer on one side of a substrate, wherein the pixel defining layer comprises a pixel opening penetrating through the thickness of the pixel defining layer, the pixel opening comprises a first sub opening and a second sub opening which are communicated with each other along the thickness direction of the pixel defining layer, the first sub opening is positioned on one side close to the substrate, and the second sub opening is positioned on one side of the first sub opening, which is far away from the substrate;
and forming at least one first carrier layer on the substrate and the surface of the pixel definition layer, which faces away from the substrate, wherein the first carrier layer comprises a first part positioned in the first sub-opening and a second part positioned on the inner surface of the second sub-opening, and the first part and the second part are separated from each other.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 8.
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