CN110098348B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN110098348B CN110098348B CN201910358789.0A CN201910358789A CN110098348B CN 110098348 B CN110098348 B CN 110098348B CN 201910358789 A CN201910358789 A CN 201910358789A CN 110098348 B CN110098348 B CN 110098348B
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- auxiliary cathode
- display panel
- contact holes
- cathode contact
- cover plate
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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
- H10K50/80—Constructional details
- H10K50/805—Electrodes
- H10K50/82—Cathodes
- H10K50/824—Cathodes combined with auxiliary electrodes
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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
- H10K59/131—Interconnections, e.g. wiring lines or terminals
Abstract
The embodiment of the invention discloses a display panel and a display device. The display panel comprises a cover plate, wherein an auxiliary cathode and a plurality of auxiliary cathode contact holes are arranged on the cover plate, and the distribution density of the auxiliary cathode contact holes on the display panel is increased progressively from the boundary to the center. The auxiliary cathode design mode provided by the embodiment of the invention designs the auxiliary cathode contact holes with different densities at different positions of the display panel, namely the distribution density of the auxiliary cathode contact holes on the display panel is sequentially increased from the boundary to the center, which is beneficial to the conduction of the auxiliary cathode contact holes, so that the IR voltage drop of the display panel is more obvious, and the display uniformity of the display panel is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel and a display device.
Background
Organic Light-Emitting Diode (OLED) display devices have attracted attention due to their advantages of being Light, thin, low in power consumption, high in response, high in resolution, and the like. The top-emitting OLED can effectively solve the problems of aperture ratio reduction and brightness reduction caused by a complex pixel circuit, and meanwhile, the color gamut of the OLED display device can be improved by utilizing the microcavity effect in the structure of the top-emitting OLED, so that the display effect is improved.
In a top-emitting OLED display panel, an auxiliary cathode is often used to reduce the influence of IR drop, and a part of OLED film Layer is often used between the auxiliary cathode and the cathode, such as an Electron Transport Layer (ETL), which needs to be conducted in a burn-in (voltage is applied between two electrodes to burn through the middle Layer).
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which are beneficial to conducting an auxiliary cathode contact hole, so that the IR voltage drop of the display panel is more obvious, and the display uniformity of the display panel is improved.
In order to solve the above problem, in a first aspect, the present application provides a display panel, where the display panel includes a cover plate, an auxiliary cathode and a plurality of auxiliary cathode contact holes are disposed on the cover plate, and the distribution density of the plurality of auxiliary cathode contact holes on the display panel increases gradually from a boundary to a center.
Further, the cover plate further includes:
a first substrate;
an auxiliary cathode disposed on the first substrate;
the coating layer is arranged on one side, far away from the first substrate, of the auxiliary cathode, the auxiliary cathode is coated by the coating layer, and the auxiliary cathode contact holes are formed in the coating layer;
and the conductive layer is arranged on one side of the coating layer, which is far away from the first substrate, and is electrically connected with the auxiliary cathode through the auxiliary cathode contact hole.
Further, the cover plate is divided into an innermost first preset area, a second preset area outside the first preset area and a third preset area outside the second preset area;
the distribution density of the auxiliary cathode contact holes on the first preset area is greater than that of the auxiliary cathode contact holes on the second preset area, and the distribution density of the auxiliary cathode contact holes on the second preset area is greater than that of the auxiliary cathode contact holes on the third preset area.
Furthermore, each pixel in the first preset area is correspondingly provided with an auxiliary cathode contact hole.
Further, 3 auxiliary cathode contact holes are provided in every 4 pixels in the second preset area.
Further, 2 auxiliary cathode contact holes are provided for every 4 pixels in the third predetermined area.
Furthermore, the cover plate further comprises a black matrix, and the auxiliary cathode is arranged on one side of the black matrix, which is far away from the first substrate.
Furthermore, the cover plate further comprises a color filter layer, and the color filter layer is arranged on one side, far away from the first substrate, of the black matrix.
Further, the display panel further comprises an array substrate, and the cover plate is arranged on the array substrate and attached to the array substrate.
In a second aspect, the present application provides a display device comprising a display panel as described in any one of the first aspect.
The display panel comprises a cover plate, wherein an auxiliary cathode and a plurality of auxiliary cathode contact holes are arranged on the cover plate, and the distribution density of the auxiliary cathode contact holes on the display panel is increased progressively from the boundary to the center. The auxiliary cathode design mode provided by the embodiment of the invention designs the auxiliary cathode contact holes with different densities at different positions of the display panel, namely the distribution density of the auxiliary cathode contact holes on the display panel is sequentially increased from the boundary to the center, which is beneficial to the conduction of the auxiliary cathode contact holes, so that the IR voltage drop of the display panel is more obvious, and the display uniformity of the display panel is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional auxiliary cathode structure for a display panel;
FIG. 2 is a schematic structural diagram of an embodiment of an auxiliary cathode of a display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an embodiment of a top-emitting OLED display panel in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
As shown in fig. 1, in the conventional auxiliary cathode design of the display panel, each pixel corresponds to one auxiliary cathode contact hole (100%), and due to IR Drop (IR Drop), voltages corresponding to different auxiliary cathode contact holes are different in a burn-in process (a voltage is applied between two electrodes to burn through an intermediate layer), a part of the auxiliary cathode contact holes are firstly conducted, and then most of current flows through the conducted auxiliary cathode contact holes to disable the conduction of other auxiliary cathode contact holes, so that the IR Drop is not obviously displayed on the display panel.
Accordingly, the embodiment of the invention provides a display panel and a display device. The following are detailed below.
First, an embodiment of the present invention provides a display panel, which includes a cover plate, wherein an auxiliary cathode and a plurality of auxiliary cathode contact holes are disposed on the cover plate, and distribution density of the plurality of auxiliary cathode contact holes on the display panel increases from a boundary to a center.
Fig. 2 is a schematic structural diagram of an embodiment of an auxiliary cathode of a display panel according to an embodiment of the present invention, where the display panel includes a cover plate, the cover plate is provided with an auxiliary cathode 201 and a plurality of auxiliary cathode contact holes 202, and the distribution density of the plurality of auxiliary cathode contact holes 202 on the display panel increases from the boundary to the center.
The auxiliary cathode design mode provided by the embodiment of the invention designs the auxiliary cathode contact holes with different densities at different positions of the display panel, namely the distribution density of the auxiliary cathode contact holes on the display panel is sequentially increased from the boundary to the center, which is beneficial to the conduction of the auxiliary cathode contact holes, so that the IR voltage drop of the display panel is more obvious, and the display uniformity of the display panel is improved.
Since an auxiliary cathode is often used to reduce the IR drop effect in the top-emitting OLED display panel, it is preferable that the display panel in the embodiment of the present invention is a top-emitting OLED display panel.
In general, as shown in fig. 3, a top emission OLED display panel includes an array substrate 10 and a cover plate 20; the array substrate 10 includes a Thin Film Transistor (TFT) (not identified in fig. 3), a pixel defining layer 11, and a top emission type OLED12, the OLED12 including an anode 121, an organic material functional layer 122, and a cathode 123, etc.; and the cap plate 20 includes an auxiliary cathode 21, a spacer 22, a conductive layer 23, etc., the conductive layer 23 serving to electrically connect the cathode 123 with the auxiliary cathode 21.
Therefore, the display panel in the embodiment of the present invention may include the basic structure in the above-mentioned top emission OLED display panel, for example, the display panel in the embodiment of the present invention may further include an array substrate, and the cover plate is disposed on the array substrate and attached to the array substrate. It should be noted that each sub-pixel region of the array substrate may further include a TFT, and a driving circuit configured by the TFT is used for driving the display panel to emit light. The TFT may be a TFT using an oxide, a silicon material, and an organic material as an organic layer, and may have a bottom gate type or a top gate type. In the embodiment of the invention, the coating layer is arranged on one side of the auxiliary cathode, which is far away from the first substrate, so that the auxiliary cathode is coated, the problem of light reflection of the auxiliary cathode can be effectively solved, and therefore, the influence on the performance of the array substrate can be effectively avoided. Although a plurality of auxiliary cathode contact holes exposing the auxiliary cathodes are formed on the coating layer, the auxiliary cathode contact holes are small in size, so that the stability of the TFT on the array substrate is not influenced by light reflection. In addition, the auxiliary cathode is coated by the coating layer, so that the auxiliary cathode of the metal material can be prevented from being oxidized by a high-temperature process, and the IR voltage drop at a low-voltage end can be avoided.
In addition, the cover plate in the embodiment of the present invention may further include: a first substrate; an auxiliary cathode disposed on the first substrate; the coating layer is arranged on one side, far away from the first substrate, of the auxiliary cathode, the auxiliary cathode is coated by the coating layer, and the auxiliary cathode contact holes are formed in the coating layer; and the conductive layer is arranged on one side of the coating layer, which is far away from the first substrate, and is electrically connected with the auxiliary cathode through the auxiliary cathode contact hole.
It should be noted that, in the top-emission OLED display panel according to the embodiment of the present invention, only a partial structure is described and illustrated (only a partial structure of the top-emission OLED display panel is identified in fig. 2 and fig. 3), it is to be understood that, in addition to the above-described structure, the top-emission OLED display panel described in the embodiment of the present invention may further include any other necessary structure as needed, and is not limited herein. Similarly, in the embodiment of the present invention, the cover plate in the display panel may further include a color filter layer, and the color filter layer is disposed on a side of the black matrix away from the first substrate.
Further, as shown in fig. 2, the cover plate is divided into an innermost first preset area 203, a second preset area 204 outside the first preset area, and a third preset area 205 outside the second preset area; the distribution density of the plurality of auxiliary cathode contact holes 202 in the first predetermined area 203 is greater than the distribution density of the plurality of auxiliary cathode contact holes 202 in the second predetermined area 204, and the distribution density of the plurality of auxiliary cathode contact holes 202 in the second predetermined area 204 is greater than the distribution density of the plurality of auxiliary cathode contact holes 202 in the third predetermined area 205.
In an embodiment of the present invention, an auxiliary cathode contact hole is disposed in each pixel of the first predetermined region 203. 3 auxiliary cathode contact holes are provided for every 4 pixels in the second preset region 204. The third preset region 205 is provided with 2 auxiliary cathode contact holes every 4 pixels.
The distribution density of the auxiliary cathode contact holes in a target area of the display panel can be a ratio of the number of the auxiliary cathode contact holes in the target area to the number of the pixels. Taking the above specific embodiment as an example, each pixel in the first preset region 203 is correspondingly provided with an auxiliary cathode contact hole, and the distribution density of the corresponding auxiliary cathode contact holes is 100%; 3 auxiliary cathode contact holes are arranged in 4 pixels of the second preset area 204, and the distribution density of the corresponding auxiliary cathode contact holes is 75%; in the third preset area 205, 2 auxiliary cathode contact holes are arranged in every 4 pixels, and the distribution density of the corresponding auxiliary cathode contact holes is 50%.
It should be noted that, in the above embodiment, the distribution densities in the first preset region 203, the second preset region 204, and the third preset region 205 are only for illustration, and it is understood that, in some other embodiments of the present invention, the distribution densities in the first preset region 203, the second preset region 204, and the third preset region 205 may be other values, and it is only required to ensure that the distribution density of the plurality of auxiliary cathode contact holes 202 on the first preset region 203 is greater than the distribution density of the plurality of auxiliary cathode contact holes 202 on the second preset region 204, and the distribution density of the plurality of auxiliary cathode contact holes 202 on the second preset region 204 is greater than the distribution density of the plurality of auxiliary cathode contact holes 202 on the third preset region 205, which is not particularly limited.
In the embodiment of the present invention, the auxiliary cathode may be made of a metal material having good conductivity, such as Ag (silver), Pt (gold), Al (aluminum), Mo (molybdenum), and Cu (copper), and the thickness of the auxiliary cathode may be, for example, 300 to 600nm, and the specific thickness may be set as required.
The embodiment of the invention also provides a display panel, which comprises a cover plate and an array substrate, wherein the cover plate is arranged on the array substrate and is attached to the array substrate. The array substrate is provided with an auxiliary cathode and a plurality of auxiliary cathode contact holes, and the distribution density of the auxiliary cathode contact holes on the display panel is increased progressively from the boundary to the center.
Wherein, the array substrate may further include: a first substrate; an auxiliary cathode disposed on the first substrate; the coating layer is arranged on one side, far away from the first substrate, of the auxiliary cathode, the auxiliary cathode is coated by the coating layer, and the auxiliary cathode contact holes are formed in the coating layer; and the conductive layer is arranged on one side of the coating layer, which is far away from the first substrate, and is electrically connected with the auxiliary cathode through the auxiliary cathode contact hole.
The array substrate can be divided into an innermost first preset area, a second preset area outside the first preset area and a third preset area outside the second preset area; the distribution density of the auxiliary cathode contact holes on the first preset area is greater than that of the auxiliary cathode contact holes on the second preset area, and the distribution density of the auxiliary cathode contact holes on the second preset area is greater than that of the auxiliary cathode contact holes on the third preset area.
In some embodiments of the present invention, an auxiliary cathode contact hole may be disposed in each pixel of the first predetermined region. 3 auxiliary cathode contact holes may be provided every 4 pixels in the second preset region. And 2 auxiliary cathode contact holes are arranged in every 4 pixels in the third preset area.
In addition, the array substrate can further comprise a black matrix, and the auxiliary cathode is arranged on one side, far away from the first substrate, of the black matrix. Meanwhile, the array substrate can further comprise a color filter layer, and the color filter layer is arranged on one side, far away from the first substrate, of the black matrix.
In order to better implement the display panel in the embodiments of the present invention, on the basis of the display panel, an embodiment of the present invention further provides a display device, which includes the display panel described in any one of the embodiments of the display panel.
By employing the display panel as described in the above embodiments, the display performance of the display device is further improved.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again.
The display panel and the display device provided by the embodiment of the present invention are described in detail above, and the principle and the embodiment of the present invention are explained herein by applying specific examples, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A display panel is characterized by comprising a cover plate, wherein an auxiliary cathode and a plurality of auxiliary cathode contact holes are arranged on the cover plate, and the distribution density of the auxiliary cathode contact holes on the display panel is increased from the boundary to the center;
the cover plate comprises a first substrate, an auxiliary cathode arranged on the first substrate and a coating layer arranged on one side, far away from the first substrate, of the auxiliary cathode, the coating layer coats the auxiliary cathode, and the auxiliary cathode contact holes are formed in the coating layer.
2. The display panel of claim 1, wherein the cover plate further comprises:
and the conductive layer is arranged on one side of the coating layer, which is far away from the first substrate, and is electrically connected with the auxiliary cathode through the auxiliary cathode contact hole.
3. The display panel according to claim 1, wherein the cover plate is divided into a first preset region at the innermost, a second preset region outside the first preset region, and a third preset region outside the second preset region;
the distribution density of the auxiliary cathode contact holes on the first preset area is greater than that of the auxiliary cathode contact holes on the second preset area, and the distribution density of the auxiliary cathode contact holes on the second preset area is greater than that of the auxiliary cathode contact holes on the third preset area.
4. The display panel of claim 3, wherein an auxiliary cathode contact hole is disposed for each pixel in the first predetermined area.
5. The display panel according to claim 4, wherein 3 auxiliary cathode contact holes are provided every 4 pixels in the second predetermined region.
6. The display panel according to claim 5, wherein 2 auxiliary cathode contact holes are provided every 4 pixels in the third predetermined region.
7. The display panel according to claim 1, wherein the cover plate further comprises a black matrix, and the auxiliary cathode is disposed on a side of the black matrix away from the first substrate.
8. The display panel according to claim 7, wherein the cover plate further comprises a color filter layer disposed on a side of the black matrix away from the first substrate.
9. The display panel according to claim 1, further comprising an array substrate, wherein the cover plate is disposed on the array substrate and attached to the array substrate.
10. A display device characterized in that it comprises a display panel as claimed in any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910358789.0A CN110098348B (en) | 2019-04-30 | 2019-04-30 | Display panel and display device |
| PCT/CN2019/115469 WO2020220630A1 (en) | 2019-04-30 | 2019-11-05 | Display panel and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910358789.0A CN110098348B (en) | 2019-04-30 | 2019-04-30 | Display panel and display device |
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| CN110098348A CN110098348A (en) | 2019-08-06 |
| CN110098348B true CN110098348B (en) | 2020-06-16 |
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| CN201910358789.0A Active CN110098348B (en) | 2019-04-30 | 2019-04-30 | Display panel and display device |
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| CN (1) | CN110098348B (en) |
| WO (1) | WO2020220630A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110098348B (en) * | 2019-04-30 | 2020-06-16 | 深圳市华星光电半导体显示技术有限公司 | Display panel and display device |
| CN111106261B (en) | 2019-12-06 | 2021-02-26 | 深圳市华星光电半导体显示技术有限公司 | Display panel and display device |
| CN111129345A (en) * | 2019-12-19 | 2020-05-08 | 深圳市华星光电半导体显示技术有限公司 | Organic light emitting diode display device |
| CN111276632B (en) * | 2020-02-19 | 2021-03-16 | 深圳市华星光电半导体显示技术有限公司 | Display panel and manufacturing method thereof |
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| KR100465883B1 (en) * | 2002-05-03 | 2005-01-13 | 엘지.필립스 엘시디 주식회사 | The organic electro-luminescence device and method for fabricating of the same |
| CN104752440B (en) * | 2015-03-20 | 2017-10-17 | 京东方科技集团股份有限公司 | A kind of dot structure, array base palte and its manufacture method |
| US10558309B2 (en) * | 2015-04-01 | 2020-02-11 | Shanghai Tianma Micro-electronics Co., Ltd. | Array substrate, touch display panel and touch display device |
| CN104699351B (en) * | 2015-04-01 | 2018-03-09 | 上海天马微电子有限公司 | Array base palte, touch-control display panel and touch control display apparatus |
| CN108933154B (en) * | 2017-05-26 | 2021-04-27 | 京东方科技集团股份有限公司 | Preparation method of organic light-emitting diode display substrate, display substrate and display device |
| CN107994061B (en) * | 2017-11-29 | 2020-11-03 | 京东方科技集团股份有限公司 | Cover plate, manufacturing method thereof and display device |
| CN208014705U (en) * | 2018-04-20 | 2018-10-26 | 京东方科技集团股份有限公司 | A kind of color membrane substrates, display panel and display device |
| CN110098348B (en) * | 2019-04-30 | 2020-06-16 | 深圳市华星光电半导体显示技术有限公司 | Display panel and display device |
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- 2019-04-30 CN CN201910358789.0A patent/CN110098348B/en active Active
- 2019-11-05 WO PCT/CN2019/115469 patent/WO2020220630A1/en active Application Filing
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| WO2020220630A1 (en) | 2020-11-05 |
| CN110098348A (en) | 2019-08-06 |
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