CN111564484A - Display panel, processing method thereof and display device - Google Patents
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- CN111564484A CN111564484A CN202010442743.XA CN202010442743A CN111564484A CN 111564484 A CN111564484 A CN 111564484A CN 202010442743 A CN202010442743 A CN 202010442743A CN 111564484 A CN111564484 A CN 111564484A
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- 238000003672 processing method Methods 0.000 title claims abstract description 13
- 239000000758 substrate Substances 0.000 claims abstract description 105
- 239000002184 metal Substances 0.000 claims description 23
- 238000000151 deposition Methods 0.000 claims description 12
- 238000000059 patterning Methods 0.000 claims description 11
- 238000005530 etching Methods 0.000 claims description 5
- 238000002347 injection Methods 0.000 abstract description 63
- 239000007924 injection Substances 0.000 abstract description 63
- 239000010408 film Substances 0.000 description 42
- 238000001704 evaporation Methods 0.000 description 10
- 230000008020 evaporation Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000969 carrier Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005525 hole transport Effects 0.000 description 1
- 230000005571 horizontal transmission Effects 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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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
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/17—Carrier injection layers
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
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Abstract
The application provides a display panel, a processing method thereof and a display device, wherein the display panel comprises a substrate, a first electrode layer positioned on one side of the substrate, a pixel limiting layer positioned on one side, far away from the substrate, of the first electrode layer, and a pixel opening positioned between the pixel limiting layers and exposing the first electrode layer; the pixel opening comprises a first opening close to the substrate, the first opening comprises a bottom edge close to one side of the substrate and a first sub-opening far away from one side of the substrate, and the orthographic projection of the first sub-opening on the first electrode layer is smaller than or equal to the orthographic projection of the bottom edge on the first electrode layer. The structure and the size of the first opening are arranged in the pixel opening, so that the hole injection layer is broken when being evaporated in the first opening to form a discontinuous film, and the problem of color cast caused by light emission due to transverse electric leakage caused by continuous reading of the hole injection layer film layer is solved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a processing method thereof and a display device.
Background
The organic light emitting diode display panel has the advantages of self-luminescence, fast response, wide viewing angle, high brightness, bright color, lightness and thinness, etc., and thus becomes an important display technology.
The conventional organic light emitting diode display panel includes a plurality of sub-pixels arranged in an array, and each sub-pixel generally includes an organic light emitting element, a thin film transistor, and the like. The organic light-emitting element includes, for example, an anode, a cathode, and a light-emitting layer interposed between the anode and the cathode. The organic light emitting element may further include at least one film layer of a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, and the like.
Because at least one film layer is a continuous film layer structure and the hole injection layer has good conductive property, when the device is supplied with an electric signal, the transverse conduction of current can occur, and the current can not be fully utilized to emit light, namely, the phenomenon of electric leakage is caused, and meanwhile, the problem of color cast can be caused by the light emission of other areas.
Disclosure of Invention
The embodiment of the invention provides a display panel, a processing method thereof and a display device.
The application provides a display panel, which comprises a substrate, a first electrode layer and a pixel limiting layer, wherein the first electrode layer is positioned on one side of the substrate, the pixel limiting layer is positioned on one side, far away from the substrate, of the first electrode layer, and the pixel opening is positioned between the pixel limiting layers and exposes the first electrode layer; the pixel opening comprises a first opening close to the substrate, the first opening comprises a bottom edge close to one side of the substrate and a first sub-opening far away from one side of the substrate, and the orthographic projection of the first sub-opening on the first electrode layer is smaller than or equal to the orthographic projection of the bottom edge on the first electrode layer.
Preferably, the pixel opening further includes a second opening that is communicated with the first opening and located on a side of the first opening away from the substrate, the second opening includes a second sub-opening close to the substrate side and a third sub-opening away from the substrate side, an orthographic projection of the second sub-opening on the first electrode layer is smaller than or equal to an orthographic projection of the base on the first electrode layer, and an orthographic projection of the third sub-opening on the first electrode layer is larger than an orthographic projection of the second sub-opening on the first electrode layer.
Preferably, the first opening is located on a side surface of the first electrode layer away from the substrate.
Preferably, the first opening is located on a side of the pixel defining layer close to the first electrode layer; or, the first opening is partially located on the surface of one side of the first electrode layer away from the substrate, and is partially located on one side of the pixel defining layer close to the first electrode layer.
Preferably, at least one of the opposite side surfaces between any two adjacent pixel defining layers is provided with a protrusion, and when the at least one side surface is one, the first opening is located between the protrusion and the other side surface; when the at least one side is two, the first opening is located between the two protrusions.
Preferably, at least one of the opposite side surfaces between any two adjacent pixel defining layers is provided with a groove, and when the at least one side surface is one, the first opening is located between the groove and the other side surface; when the at least one side is two, the first opening is located between the two grooves.
Preferably, the first opening further includes two side edges connecting the bottom edge and the first sub-opening, and an included angle between the two side edges and the substrate is greater than 0 and less than or equal to 90 degrees;
preferably, the thickness of the first opening is 10 to 15 nm.
The present application also provides a processing method of a display panel, which includes:
forming a substrate, forming a patterned first electrode layer on one side of the substrate,
depositing a pixel defining layer on one side of the first electrode layer far away from the substrate, and patterning the pixel defining layer to form a pixel opening exposing the first electrode layer;
and forming a first opening close to the substrate in the pixel opening, wherein the first opening comprises a bottom edge close to one side of the substrate and a first sub-opening far away from one side of the substrate, and the orthographic projection of the first sub-opening on the first electrode layer is smaller than or equal to the orthographic projection of the bottom edge on the first electrode layer.
Preferably, a first opening is formed in the pixel opening adjacent to the substrate,
depositing a metal layer before depositing the pixel limiting layer on the first electrode layer, patterning the pixel limiting layer to form a pixel opening exposing the metal layer, and etching the metal layer to form the first opening; the orthographic projection of the metal layer on the first electrode layer is smaller than or equal to the size of the first electrode layer, and is larger than or equal to the orthographic projection of an opening, contacting the pixel opening and the metal layer, on the first electrode layer.
Preferably, a first opening is formed in the pixel opening adjacent to the substrate,
particularly, a first opening is formed by patterning at least one of opposite side surfaces between any two adjacent pixel limiting layers;
and/or patterning the surface of the first electrode layer away from the substrate to form a first opening.
The application also provides a display device which is characterized by comprising the display panel.
The application provides a display panel, a processing method thereof and a display device, which comprise a substrate, a first electrode layer positioned on one side of the substrate, a pixel limiting layer positioned on one side, far away from the substrate, of the first electrode layer, and a pixel opening positioned between the pixel limiting layers and exposing the first electrode layer; wherein the pixel opening comprises a first opening proximate to the substrate. The first opening comprises a bottom edge close to one side of the substrate and a first sub-opening far away from one side of the substrate, and the orthographic projection of the first sub-opening on the first electrode layer is smaller than or equal to the orthographic projection of the bottom edge on the first electrode layer. The structure and the size of the first opening close to the first electrode layer are arranged in the pixel opening, so that the hole injection layer is broken when being evaporated at the first opening to form a discontinuous film, and the problem of color cast caused by light emission due to transverse electric leakage caused by continuous reading of the hole injection layer film layer is solved.
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 schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a display panel processing method according to an embodiment of the present invention.
Reference numerals:
the display panel comprises a 10 display panel body, a 100 substrate body, a 200 first electrode layer body, a 300 pixel limiting layer body, a 400 pixel opening body, a 401 first opening body, a 4010 bottom edge, a 4011 first sub opening body, a 402 second opening body, a 4020 second sub opening body, a 500 groove, a protrusion and a 600 metal layer.
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.
An organic light emitting diode display panel in the prior art includes a plurality of sub-pixels arranged in an array, and each sub-pixel generally includes an organic light emitting element and a thin film transistor. For example, an organic light emitting element generally includes an anode, a cathode, and a light emitting layer interposed between the anode and the cathode, and holes injected from the anode and electrons injected from the cathode are recombined in the light emitting layer to generate excitons, thereby causing the light emitting layer to emit light. The organic light emitting element generally further includes an organic functional film layer such as a hole injection layer. In the process of manufacturing an organic light-emitting element, a hole injection layer is generally formed by an evaporation method. In the organic light emitting diode display panel, a plurality of sub-pixels in each pixel generally share a hole injection layer, and the hole injection layer is applied as a common layer, so that the manufacturing process can be simplified, and the production cost can be reduced.
Each pixel of the array substrate includes three sub-pixels, each of which includes an organic light emitting element. The organic light-emitting element comprises an anode, a cathode, a light-emitting layer, a hole injection layer and the like. The hole injection layer is a continuous film layer and is located in the region inside each sub-pixel and between adjacent sub-pixels, that is, the organic light emitting elements of the three sub-pixels share the hole injection layer. For example, the light emitting layer in the first sub-pixel may be a red light emitting layer, the light emitting layer in the second sub-pixel may be a green light emitting layer, and the light emitting layer in the third sub-pixel may be a blue light emitting layer.
When a voltage is applied to the second sub-pixel and no voltage is applied to the first and third sub-pixels, theoretically only the light emitting layer of the second sub-pixel should emit green light and the light emitting layers of the first and third sub-pixels should not emit light. However, since the lateral transport rate of carriers of the hole injection layer is generally high, under the action of the voltage difference, carriers of the hole injection layer located in the second sub-pixel are laterally transported to the hole injection layer located in the first sub-pixel and the hole injection layer located in the third sub-pixel adjacent to the hole injection layer, so that the light emitting layer in the first sub-pixel emits red light and the light emitting layer in the third sub-pixel emits blue light.
When a user views the display panel including the array substrate from the viewing side, the user may see the green sub-pixel, the red sub-pixel, and the blue sub-pixel to be displayed simultaneously, which is more serious in the high resolution display panel. The horizontal transmission of the carriers of the hole injection layer in the adjacent sub-pixels can cause the display panel to generate undesirable phenomena such as color crosstalk and contrast reduction, so that the display panel can not meet the normal display requirement and the display effect of the display panel is influenced.
The application provides a display panel, which comprises a substrate, a first electrode layer positioned on one side of the substrate, a pixel limiting layer positioned on one side, far away from the substrate, of the first electrode layer, and a pixel opening positioned between the pixel limiting layers and exposing the first electrode layer; the pixel opening comprises a first opening close to the substrate, the first opening comprises a bottom edge close to one side of the substrate and a first sub-opening far away from one side of the substrate, and the orthographic projection of the first sub-opening on the first electrode layer is smaller than or equal to the orthographic projection of the bottom edge on the first electrode layer. According to the pixel structure, the structure and the size of the first opening close to the first electrode layer are arranged in the pixel opening, so that the evaporation of the hole injection layer is broken during the first opening to form a discontinuous film, and the problem of color cast caused by light emission due to transverse electric leakage caused by continuous reading of the hole injection layer film layer is solved.
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 following describes the display panel, the processing method thereof, and the display device according to the embodiment of the invention in detail with reference to fig. 1 to 4. 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.
The invention discloses a display panel 10, which comprises a substrate 100, a first electrode layer 200 positioned on one side of the substrate 100, a pixel limiting layer 300 positioned on one side of the first electrode layer 200 far away from the substrate 100, and a pixel opening 400 positioned between the pixel limiting layers 300 and exposing the first electrode layer 200; the pixel opening 400 includes a first opening 401 close to the substrate 100, the first opening 400 includes a bottom edge 4010 close to one side of the substrate 100 and a first sub-opening 4011 far from one side of the substrate 100, an orthogonal projection of the first sub-opening 4011 on the first electrode layer 200 is smaller than or equal to an orthogonal projection of the bottom edge 4010 on the first electrode layer 200, that is, a length of the bottom edge 4010 of the first opening 401 is greater than or equal to an opening length of the first sub-opening 4011.
According to the application, the structure and the size of the first opening 401 arranged in the pixel opening 400 enable the pixel opening to be close to one side of the first electrode to form a section, so that the pixel opening is broken when a hole injection layer is subsequently evaporated to form a discontinuous film, and the problem of color cast caused by light emission due to transverse electric leakage caused by continuous reading of the hole injection layer film is solved.
Specifically, the length in the present application is the length dimension in the direction parallel to the first electrode layer, the thickness in the present application is the thickness dimension in the film deposition direction, the first electrode layer in the present application is an anode, an ITO film layer, the substrate in the present application includes a hard substrate such as a steel sheet, glass, etc., and further includes a flexible substrate such as polyimide, etc
The pixel opening 400 described herein further includes a second opening 402 communicating with the first opening 401 and located on a side of the first opening 401 away from the substrate 100, where the second opening 402 includes a second sub-opening 4020 close to the substrate 100, an orthographic projection of the second sub-opening 4020 on the first electrode layer 200 is smaller than or equal to an orthographic projection of the base edge 4010 on the first electrode layer 200, and in addition, the second sub-opening 4020 is coplanar with the first sub-opening 4011 to jointly define an opening size between the first opening 401 and the second opening 402, that is, a length of the base edge 4010 of the first opening 401 is greater than or equal to an opening length of the second sub-opening 4020 of the second opening 402.
In addition, the second opening 402 includes a third sub-opening (not labeled) on a side away from the substrate, and an orthographic projection of the third sub-opening on the first electrode layer 200 is larger than an orthographic projection of the second sub-opening 4020 on the first electrode layer 200. The design makes the second opening form a structure with a large top and a small bottom, and the deposition area of the organic light-emitting layer cannot be influenced by depositing the organic light-emitting layer after the evaporation of the functional film layers such as the hole injection layer and the like, so that the light-emitting efficiency of the organic light-emitting layer cannot be influenced.
The first opening 401 further includes two side edges (not labeled in the figure) connecting the bottom edge 4010 and the first sub-opening 4011, and an included angle between the two side edges and the substrate 100 is greater than 0 and less than or equal to 90 degrees, preferably 15-90 degrees. The included angle is designed so that the film layer is easy to break at the position of the side far away from the end point close to the first sub-opening 4011 during subsequent film layer evaporation, and the design structure is simple.
In a first embodiment, as shown in fig. 1, the first opening 401 is located on a side surface of the first electrode layer 200 away from the substrate 100.
Specifically, the first electrode 200 is patterned from the surface on the side away from the substrate 100 to the surface close to the substrate 100 to form a recessed groove 500, so as to form a first opening 400, where the first opening 401 includes a bottom edge 4010 close to the substrate 401, a first sub-opening 4011 opposite to the bottom edge 4010, and side edges respectively connecting the bottom edge 4010 and the end point of the first sub-opening 4011. The length of the bottom edge 4010 is greater than or equal to the opening length of the first sub-opening 4011, and the included angle between the two side edges and the substrate 100 is greater than 0 and less than or equal to 90 degrees, preferably 15 to 90 degrees, so that the first opening 401 is in a trapezoid structure with a small upper part and a large lower part or a quadrilateral structure with an equal upper part and a equal lower part.
On the basis that the structure of the pixel limiting layer is not changed, the problem can be solved only by thinning the first electrode layer to form the first opening on the first electrode layer in the pixel limiting layer, and the process is simple and easy to implement. The second opening 402 is located between two adjacent pixel defining layers 300, so that the shape of the whole pixel opening forms a structure with a large top and a small bottom, and when a hole injection layer is subsequently deposited, the hole injection layer is disconnected at the intersection of the side edge of the first opening 401 and the side edge of the second opening 402, namely, at the end point of the first sub-opening 4011 of the first opening 401, so that the problem of crosstalk color cast caused by continuous deposition of a hole injection film layer is prevented.
Preferably, the thickness of the first opening is 10 to 15 nm. Because the thickness of the hole injection layer is thinner, generally about 10-15nm, the first opening just fills the first opening just after the evaporation of the hole injection layer is finished, the continuity of film formation of other subsequent film layers such as a light-emitting layer, a cathode and the like can not be influenced, and the problem of crosstalk color cast caused by transverse electric leakage is improved while the normal light emission of the device is ensured.
In another embodiment, as shown in fig. 2 to 3, the first opening is located on a side of the pixel defining layer close to the first electrode layer.
Preferably, at least one of opposite side surfaces between any two adjacent pixel defining layers 300 is provided with a protrusion 500, and when the at least one side surface is one, the first opening 401 is located between the protrusion 500 and the other side surface; when the at least one side is two, the first opening 401 is located between the two protrusions 500.
When the at least one side surface is one, that is, a protrusion 500 is disposed on one of the two opposite side surfaces, the protrusion 500 is located in the pixel opening 400, and the protrusions 500 respectively include a first extending portion (not shown) extending from the side surface of the pixel defining layer toward the other side surface, the first extending portion extends along a direction close to the first electrode layer 200 to form a second extending portion (not shown), and an included angle of 0 to 90 °, preferably (15 to 90 °) is formed between the first extending portion and the second extending portion. The included angle faces the other side face, so that the first opening is located between the protrusion and the other side face, namely, the second extension portion, the other side face and the first electrode layer form the first opening, and the first opening is disconnected at an included angle formed by the first extension portion and the second extension portion when a film layer is deposited subsequently.
When the at least one side is two, that is, the two opposite sides are both provided with the protrusions 500, and the angles of the two protrusions are opposite to each other. The protrusions 500 are located in the pixel openings 400, and the protrusions 500 respectively extend toward the other protrusion 500 to form a first extending portion (not shown), the first extending portion extends along a direction close to the first electrode layer 200 to form a second extending portion (not shown), and an included angle of 0-90 °, preferably 15-90 °, is formed between the first extending portion and the second extending portion. The first opening 401 is located between two opposite protrusions, that is, the two second extending portions and the first electrode layer form the first opening. The corner formed by the first extension part and the second extension part is broken when a film layer is deposited subsequently, and the process is simple.
The first opening 401 is formed between the second extending portion and the surface of the first electrode layer 200, the second opening 402 is formed between the first extending portion and the side of the pixel defining layer 300 away from the substrate 100, and the first opening 401 is connected to the second opening 402 and located on the side of the first opening away from the substrate. The second extending portion forms a side edge of the first opening 401, a bottom edge 4010 of the first opening 401 is formed on the surface of the first electrode layer 200, an included angle formed by the first extending portion and the second extending portion and an opposite side surface or an opposite included angle form the first opening 401, and an opening length of the first sub-opening 4011 and the second sub-opening 4020 is defined, that is, the length of the first sub-opening 4011 is equal to the opening length of the second sub-opening 4020. The length of the bottom edge 4010 is greater than or equal to the opening length of the first sub opening 4011, that is, greater than or equal to the opening length of the second sub opening 4020 on the side of the second opening 402 close to the substrate 100. The deposition size of the light-emitting layer is not changed on the basis of ensuring the disconnection of the film layers such as hole injection and the like, and the light-emitting effect is not influenced.
When only one protrusion is disposed on one side surface of the pixel defining layer and no protrusion is disposed on the other side surface of the pixel defining layer, the length of the base 4010 is greater than or equal to the opening length of the first sub-opening 4011, so that a trapezoid with a small top and a large bottom, or a quadrilateral or parallelogram structure with a same top and bottom is formed between the protrusion 500 and the side surface of the pixel defining layer where no protrusion is disposed. The included angle formed by the first extension part and the second extension part of one protrusion is 0-90 degrees, so that an angle of 0-90 degrees, preferably 15-90 degrees, is formed between the side edge of one side of the first opening 401 and the bottom edge 4010 of the first opening 401, so that the hole injection layer is disconnected at the included angle when the hole injection layer is subsequently deposited, and the problem of crosstalk color cast caused by the continuity of the hole injection film layer is prevented.
When two side surfaces are provided with a protrusion, the length of the bottom edge 4010 is greater than or equal to the opening length of the first sub-opening 4011, so that a trapezoid with a small top and a large bottom is formed between the two protrusions 500. The included angles formed by the two opposite protrusions and the first extending parts and the second extending parts are oppositely arranged, the included angle is 0-90 degrees, preferably 15-90 degrees, so that the hole injection layer is disconnected at the included angle when the hole injection layer is deposited subsequently, and the problem of crosstalk color cast caused by continuity of the hole injection film layer is prevented.
Preferably, the thickness of the first opening is 10 to 15 nm. Because the thickness of the hole injection layer is thinner, generally about 10-15nm, the first opening just fills the first opening just after the evaporation of the hole injection layer is finished, the film forming continuity of film layers such as a cathode and the like cannot be influenced, and the problem of crosstalk color cast caused by transverse electric leakage is improved while the normal light emitting of a device is ensured.
In a third embodiment, as shown in fig. 2 to 3, the first opening is located on a side of the pixel defining layer close to the first electrode layer.
Specifically, at least one of opposite side surfaces between any two adjacent pixel defining layers 300 is provided with a groove 500, and when the at least one side surface is one, the first opening 401 is located between the groove 500 and the other side surface; when the at least one side is two, the first opening 401 is located between the two grooves 500.
When the at least one side surface is one, that is, a groove 500 is disposed on one of the two opposite side surfaces, the groove 500 is located in the pixel opening 400, and the groove 500 extends from the side surface where the groove is disposed toward the pixel defining layer 300 to form a first extending portion (not shown), and the first extending portion extends along a direction approaching the first electrode layer 200 to form a second extending portion (not shown). The first extension portion and the side surface of the pixel defining layer provided with the groove form an included angle of 0-90 degrees, preferably 15-90 degrees, the included angle points to the side surface of the pixel defining layer not provided with the groove, and the first extension portion, the second extension portion and the first electrode layer form a first opening 401.
When the at least one side is two, that is, the two opposite sides are both provided with the grooves 500, and the two grooves are opposite to each other. The grooves 500 are located in the pixel opening 400, and the grooves 500 extend from the grooved side toward the pixel defining layer 300 to form first extending portions (not shown), and the first extending portions extend along a direction close to the first electrode layer 200 to form second extending portions (not shown). The first extension portion and the side surface of the pixel defining layer provided with the groove form an included angle of 0-90 degrees, preferably 15-90 degrees, the included angles are oppositely arranged, and the first extension portion, the second extension portion and the first electrode layer form a first opening 401.
The first opening 401 is formed on the surface of the first electrode layer 200, the second opening 402 is formed between the first extension portion and the side surface of the pixel defining layer 300 away from the substrate 100, and the first opening 401 is connected to the second opening 402 and located on the side of the first opening away from the substrate. The second extension portion forms a side edge of the first opening 401, a bottom edge 4010 of the first opening 401 is formed on the surface of the first electrode layer 200, an included angle formed between the first extension portion and a side surface of the pixel definition layer and an opposite side surface or an opposite included angle form the first opening 401, and an opening length of the first sub-opening 4011 and the second sub-opening 4020 is defined, that is, the length of the first sub-opening 4011 is equal to the opening length of the second sub-opening 4020. The length of the bottom edge 4010 is greater than or equal to the opening length of the first sub opening 4011, that is, greater than or equal to the opening length of the second sub opening 4020 on the side of the second opening close to the substrate.
When only one groove is formed on one side surface of the pixel defining layer and no groove is formed on the other side surface of the pixel defining layer, the length of the bottom edge 4010 is greater than or equal to the opening length of the first sub opening 4011, so that a structure in the shape of a trapezoid, or a parallelogram or a quadrangle with equal upper and lower parts is formed between the groove 500 and the side surface of the pixel defining layer without the groove. The one groove forms an angle of 0-90 deg., preferably 15-90 deg., with the side of the pixel defining layer where the groove is provided. When the hole injection layer is deposited subsequently, the hole injection layer is disconnected at the included angle, so that the problem of crosstalk color cast caused by the continuity of the hole injection film layer is prevented.
When two side surfaces are provided with a groove, the length of the bottom edge 4010 is greater than or equal to the opening length of the first sub-opening 4011, so that the two grooves 500 form a regular quadrilateral structure. The two opposite grooves are respectively arranged opposite to an included angle formed between the side surfaces of the pixel defining layer provided with the grooves, and the included angle is 0-90 degrees, preferably 15-90 degrees. When the hole injection layer is deposited subsequently, the hole injection layer is disconnected at the included angle, so that the problem of crosstalk color cast caused by the continuity of the hole injection film layer is prevented.
In addition, the groove between the pixel limiting layer and the first electrode is designed, so that a gap drop is formed between the included angle and the first electrode layer, and the hole injection layer is more easily disconnected at the included angle when a hole injection layer is subsequently deposited, namely the hole injection layer is deposited in the first opening, so that the problem of crosstalk color cast caused by the continuity of the hole injection film layer is prevented.
Preferably, the thickness of the first opening is 10 to 15 nm. Because the thickness of the hole injection layer is thinner, generally about 10-15nm, the first opening just fills the first opening just after the evaporation of the hole injection layer is finished, the film forming continuity of film layers such as a cathode and the like cannot be influenced, and the problem of crosstalk color cast caused by transverse electric leakage is improved while the normal light emitting of a device is ensured.
In a fourth embodiment, a first embodiment is added on the basis of the second and third embodiments, and the first opening is partially located on a surface of the first electrode layer on a side away from the substrate, and partially located on a side of the pixel defining layer close to the first electrode layer. Namely, the bottom edge of the first opening is located inside the first electrode layer, the first sub-opening 4011 is located inside the pixel defining layer, a part of two side edges connecting the first sub-opening and the bottom edge is located inside the pixel defining layer, and a part of the two side edges connecting the first sub-opening and the bottom edge is located inside the first electrode layer, so that the first opening is located between the first sub-opening and the pixel defining layer, and in addition, the length of the bottom edge of the first opening is greater than or equal to the opening length of the first sub-opening. When the hole injection layer is deposited subsequently, the hole injection layer is more easily disconnected at the included angle, namely the hole injection layer is deposited in the first opening, so that the problem of crosstalk color cast caused by continuous hole injection film layers is prevented.
And the thickness of the first opening is 10-15 nm. Because the thickness of the hole injection layer is thinner, generally about 10-15nm, the first opening just fills the first opening just after the evaporation of the hole injection layer is finished, the film forming continuity of film layers such as a cathode and the like cannot be influenced, and the problem of crosstalk color cast caused by transverse electric leakage is improved while the normal light emitting of a device is ensured.
In the first, second, third and fourth embodiments, the bottom edge of the first opening and the two side edges of the first sub-opening are connected, and the included angle between the two side edges and the substrate is greater than 0 and less than or equal to 90 degrees, preferably 15-90 degrees. The included angle is designed so that the film layer is easy to break at the position of the side far away from the end point close to the first sub-opening 4011 during subsequent film layer evaporation, and the design structure is simple.
As shown in fig. 4, the present application also provides a processing method of a display panel, which includes:
forming a substrate 100, forming a patterned first electrode layer 200 on one side of the substrate 100,
depositing a pixel defining layer 300 on the side of the first electrode layer 200 far away from the substrate 100, and patterning the pixel defining layer 300 to form a pixel opening 400 exposing the first electrode layer;
a first opening 401 close to the substrate 100 is formed in the pixel opening 400, the first opening 401 includes a bottom edge 4010 close to one side of the substrate 100 and a first sub-opening 4011 far from one side of the substrate 100, and an orthogonal projection of the first sub-opening 4011 on the first electrode layer 200 is smaller than or equal to an orthogonal projection of the bottom edge 4010 on the first electrode layer 200.
The processing method further comprises the following steps: and forming a second opening 402 which is communicated with the first opening 401 and is positioned on the side of the first opening 401 far away from the substrate 100, and a third sub-opening far away from the substrate, wherein the orthographic projection of the second sub-opening on the first electrode layer is smaller than or equal to the orthographic projection of the bottom edge on the first electrode layer, and the orthographic projection of the third sub-opening on the first electrode layer is larger than the orthographic projection of the second sub-opening on the first electrode layer. In the first scheme of forming the first opening 401, the first opening 401 is formed in the pixel opening 400 close to the substrate, specifically, a metal layer 600 is deposited before the pixel defining layer 300 is deposited on the first electrode layer 200.
Specifically, on the basis of the above steps, the pixel defining layer 300 is patterned to form the pixel opening 400 exposing the metal layer 600, and the metal layer 600 is etched to form the first opening 401; the orthographic projection of the metal layer on the first electrode layer is smaller than or equal to the size of the first electrode layer, and is larger than or equal to the orthographic projection of an opening, contacting the pixel opening and the metal layer, on the first electrode layer. Specifically, the length of the metal layer 600 is less than or equal to the length of the first electrode layer 200, and is greater than or equal to the length of the opening 4020 on the substrate side of the second opening 402, and when the length of the metal layer 600 is equal to the length of the second sub-opening 4020 of the second opening 402, an included angle of 90 degrees is formed between the side surface of the pixel defining layer 300, where the first opening 402 is formed, and the first electrode layer 200; when the length of the metal layer 600 is greater than the second sub-opening 4020 of the second opening 402, an included angle between the side of the pixel defining layer 300 forming the second opening 402 and the first electrode layer 200 is greater than 0 and smaller than 90 degrees. After the pixel defining layer 300 is formed, the metal layer 600 is etched away, so that a gap structure is formed between the first electrode layer 200 and the pixel defining layer 300 to form the first opening 401.
The metal layer is easily etched, such as Al, the thickness of the metal layer is 10-15nm, and when the metal layer is etched to form a first opening with the thickness of 10-15nm to deposit the film layer of the hole injection layer. Because the thickness of the hole injection layer is relatively thin, generally the thickness is 10-15nm, the first opening can be disconnected at the included angle after the evaporation of the hole injection layer is finished, so that a discontinuous film is formed, and the problem of transverse electric leakage caused by the hole injection layer is solved. In addition, the thickness of the first opening is thin, so that the film forming continuity of other film layers such as a subsequent light emitting layer and a cathode is not influenced, and the transverse electric leakage problem is improved while the normal light emitting of the device is ensured. The scheme can improve the transverse electric leakage problem and can also improve the color cast caused by light emission due to electric leakage.
In the second scheme of forming the first opening 401, the first opening 401 is formed in the pixel opening 400 close to the substrate, and at least one of the opposite side surfaces between any two adjacent pixel defining layers is patterned to form the first opening.
Specifically, at least one of opposite side surfaces between any two adjacent pixel defining layers is patterned and the side surface is close to the first electrode layer, and a groove is formed in the pixel defining layer by patterning from the side surface to form the first opening.
Or, performing patterned etching on one side of the pixel defining layer close to the pixel opening and one side of the pixel defining layer far from the first electrode layer, namely performing etching with a certain thickness from one side of the pixel defining layer far from the first electrode layer to one side of the pixel defining layer close to the first electrode layer, and reserving a part with a certain thickness, forming a protrusion between the reserved part and the etched pixel defining layer, so that the first opening is formed between the protrusions.
Or, the bulges connected with the pixel limiting layer are deposited on one side of the pixel limiting layer close to the pixel opening and one side of the first electrode layer, so that the first opening is formed between the bulges.
And/or, in a third scheme of forming the first opening 401, patterning the first electrode to perform patterned etching from the surface far away from the substrate to the side close to the substrate, so as to form the first opening.
The third embodiment may be further processed on the basis of the second embodiment in which the first opening 401 is formed, so that a part of the first opening is located in the first electrode layer and a part of the first opening is located in the pixel defining layer.
The application also provides a display device which is characterized by comprising the display panel.
According to the display panel, the processing method of the display panel and the display device, the pixel opening comprises a first opening close to the substrate, the first opening comprises a bottom edge close to one side of the substrate and a first sub opening far away from one side of the substrate, and the length of the bottom edge of the first opening is larger than or equal to the opening length of the first sub opening. The structure and the size of the first opening are arranged in the pixel opening, so that the hole injection layer is broken when being evaporated in the first opening to form a discontinuous film, and the problem of color cast caused by light emission due to transverse electric leakage caused by continuous reading of the hole injection layer film layer is solved.
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 is characterized by comprising a substrate, a first electrode layer positioned on one side of the substrate, a pixel limiting layer positioned on one side, far away from the substrate, of the first electrode layer, and a pixel opening positioned between the pixel limiting layers and exposing the first electrode layer; the pixel opening comprises a first opening close to the substrate, the first opening comprises a bottom edge close to one side of the substrate and a first sub-opening far away from one side of the substrate, and the orthographic projection of the first sub-opening on the first electrode layer is smaller than or equal to the orthographic projection of the bottom edge on the first electrode layer.
2. The display panel of claim 1, wherein: the pixel opening further comprises a second opening which is communicated with the first opening and is located on one side, far away from the substrate, of the first opening, the second opening comprises a second sub-opening close to one side of the substrate and a third sub-opening far away from one side of the substrate, the orthographic projection of the second sub-opening on the first electrode layer is smaller than or equal to the orthographic projection of the bottom edge on the first electrode layer, and the orthographic projection of the third sub-opening on the first electrode layer is larger than the orthographic projection of the second sub-opening on the first electrode layer.
3. The display panel of claim 1, wherein: the first opening is located on one side surface, far away from the substrate, of the first electrode layer.
4. The display panel of claim 1, wherein: the first opening is positioned on one side of the pixel defining layer close to the first electrode layer; or, the first opening is partially located on the surface of one side of the first electrode layer away from the substrate, and is partially located on one side of the pixel defining layer close to the first electrode layer.
5. The display panel of claim 4, wherein: at least one of the opposite side surfaces between any two adjacent pixel limiting layers is provided with a protrusion or a groove, and when the at least one side surface is one, the first opening is positioned between the protrusion or the groove and the other side surface; when the at least one side is two, the first opening is located between the two protrusions or the two grooves.
6. The display panel of claim 1, wherein: the first opening also comprises two side edges which are connected with the bottom edge and the first sub opening, and the included angle between the two side edges and the substrate is more than 0 and less than or equal to 90 degrees; the thickness of the first opening is 10-15 nm.
7. A processing method of a display panel is characterized in that:
forming a substrate, forming a patterned first electrode layer on one side of the substrate,
depositing a pixel defining layer on one side of the first electrode layer far away from the substrate, and patterning the pixel defining layer to form a pixel opening exposing the first electrode layer;
and forming a first opening close to the substrate in the pixel opening, wherein the first opening comprises a bottom edge close to one side of the substrate and a first sub-opening far away from one side of the substrate, and the orthographic projection of the first sub-opening on the first electrode layer is smaller than or equal to the orthographic projection of the bottom edge on the first electrode layer.
8. The display panel of claim 7, wherein: forming a first opening in the pixel opening proximate to the substrate,
depositing a metal layer before depositing the pixel limiting layer on the first electrode layer, patterning the pixel limiting layer to form a pixel opening exposing the metal layer, and etching the metal layer to form the first opening;
the orthographic projection of the metal layer on the first electrode layer is smaller than or equal to the size of the first electrode layer, and is larger than or equal to the orthographic projection of an opening, contacting the pixel opening and the metal layer, on the first electrode layer.
9. The display panel of claim 7, wherein: forming a first opening in the pixel opening proximate to the substrate,
particularly, a first opening is formed by patterning at least one of opposite side surfaces between any two adjacent pixel limiting layers;
and/or patterning the surface of the first electrode layer away from the substrate to form a first opening.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 6.
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