CN110429111B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN110429111B CN110429111B CN201910637049.0A CN201910637049A CN110429111B CN 110429111 B CN110429111 B CN 110429111B CN 201910637049 A CN201910637049 A CN 201910637049A CN 110429111 B CN110429111 B CN 110429111B
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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
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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
- H10K50/822—Cathodes characterised by their shape
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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
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
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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
- H10K59/122—Pixel-defining structures or layers, e.g. banks
Abstract
The application provides a display panel and display device, wherein, display panel includes: a planarization layer; a pixel defining layer formed on the planarization layer and defining a plurality of pixel regions; an anode layer and an organic layer sequentially formed on the planarization layer and located in the pixel region; a cathode layer formed on the pixel defining layer and the organic layer; a plurality of grooves are formed on the surface, in contact with the cathode layer, of the pixel defining layer, the grooves are arranged at intervals, and the cathode layer and the pixel defining layer are arranged in a conformal mode. Therefore, the cathode layer also has a groove structure, has a certain antireflection effect on the environmental light entering the society, reduces glare and improves the display contrast.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
At present, when external light irradiates on a metal electrode of an OLED device, an obvious reflection phenomenon can be generated, so that the problems of glare, color saturation reduction, display contrast reduction and the like in human vision are caused.
The traditional polaroid has high reflectivity, and when the polaroid is directly manufactured on a screen body by adopting a coating mode, the problem that the reflectivity of the screen body is high and the use requirement cannot be completely met still exists.
Disclosure of Invention
The application provides a display panel and a display device, which aim to solve the problem that the display contrast is low due to the reflected light of the display panel in the prior art.
In order to solve the above technical problem, the present application provides a display panel, including: a planarization layer; the pixel defining layer is formed on the planarization layer and is defined with a plurality of pixel regions; the anode layer and the organic layer are sequentially formed on the planarization layer and are positioned in the pixel area; a cathode layer formed on the pixel defining layer and the organic layer; and a plurality of grooves are formed on the surface of the pixel defining layer, which is in contact with the cathode layer, the grooves are arranged at intervals, and the cathode layer and the pixel defining layer are arranged in a conformal manner.
Wherein the groove has a curved inner surface; preferably, the grooves are hemispherical grooves, and the diameter of each hemispherical groove is less than or equal to 5 micrometers.
Wherein a refractive index of the pixel defining layer is lower than a refractive index of the planarization layer.
Wherein nanoparticles are formed between the cathode layer and the organic layer.
Wherein the pixel defining layer is opaque, and the anode layer includes a patterned conductive layer and a flat conductive layer covering the patterned conductive layer.
The patterned conducting layer is of a grating structure and comprises a plurality of grating units and pixel regions with different light emitting colors, and the widths of the grating units are different.
Wherein the pixel defining layer is opaque, the anode layer is isosceles triangle in each pixel region, and the base angle of the isosceles triangle is beta; the included angle between the connecting surface of the vertex of the isosceles triangle and the edge of the top end of the corresponding pixel area and the pixel defining area is alpha; the alpha is equal to the beta.
Wherein the display panel comprises a polarizer formed on the cathode layer; the surface of the polaroid, which is far away from the cathode layer, is of a non-smooth structure.
In order to solve the above technical problem, the present application provides a display device, which includes the above display panel.
The display panel comprises a planarization layer, a pixel definition layer formed on the planarization layer, an anode layer and an organic layer, wherein the anode layer and the organic layer are positioned in a plurality of pixel regions defined by the pixel definition layer. The cathode layer is disposed to cover the organic layer and the pixel defining layer. A plurality of grooves are formed on the surface, in contact with the cathode layer, of the pixel defining layer, the grooves are arranged at intervals, and the cathode layer and the pixel defining layer are arranged in a conformal mode. The cathode layer is also provided with a groove structure, and the groove structure can reduce reflection of ambient light irradiated on the cathode layer, reduce glare and improve display contrast.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, 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 structural diagram of a display panel according to a first embodiment of the present application;
FIG. 2 is a diagram illustrating a first embodiment of the display panel shown in FIG. 1 in which light is emitted to the cathode;
FIG. 3 is a schematic structural diagram of a second embodiment of a display panel according to the present application;
FIG. 4 is a schematic view of an anode layer of a third embodiment of a display panel of the present application;
FIG. 5 is a schematic view of another embodiment of an anode layer of a display panel of the present application;
FIG. 6 is a diagram illustrating the direction of light irradiating the anode layer in the third embodiment of the display panel shown in FIG. 4;
FIG. 7 is a schematic view of an anode layer of a fourth embodiment of a display panel of the present application;
FIG. 8 is a schematic structural diagram of a fifth embodiment of a display panel according to the present application;
FIG. 9 is a schematic structural diagram of an embodiment of a display device according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. 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 application.
In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. All directional indicators in the embodiments of the present application (such as upper, lower, left, right, front, rear, top, bottom … …) are only used to explain the relative positional relationship between the components, the movement, etc. in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a display panel 100 of the present application according to a first embodiment, where the display panel 100 includes a planarization layer 11, a pixel defining layer 12, an anode layer 13, an organic layer 14, and a cathode layer 15.
The pixel defining layer 12 is formed on the planarization layer 11, and defines a plurality of pixel regions 121, each corresponding to each pixel of the display panel 100; an anode layer 13 and an organic layer 14 are sequentially formed on the planarization layer 11, and are positioned in the pixel region 121; a cathode layer 15 is formed on the organic layer 14 and the pixel defining layer 12.
The anode layer 13, the organic layer 14, and the cathode layer 15 constitute a pixel light emitting structure, and display of the display panel is realized. In order to solve the technical problems that in the prior art, the cathode layer is used as a metal layer to cover the surface of the display panel, and when ambient light irradiates the display panel, the ambient light is reflected by the metal surface of the cathode layer, so that glare in human vision, reduction of color saturation, display blurring and the like are caused, in the embodiment, the shape of the cathode layer 15 is improved to reduce reflection and improve the contrast of the display panel. Specifically, a plurality of grooves 122 are formed on the surface of the pixel defining layer 12 in contact with the cathode layer 15, the grooves 122 are arranged at intervals, the cathode layer 15 is arranged in conformity with the pixel defining layer 12, the cathode layer 15 is deposited by using a general mask in the process, and can be deposited along the shape of the grooves after being deposited, that is, the cathode layer 15 is also formed with a groove structure. The groove structure can reduce reflection of ambient light irradiated on the cathode layer 15, thereby reducing glare and improving display contrast.
Further, in the present embodiment, the groove 122 has a curved inner surface, preferably, the groove 122 is a hemispherical groove 122, the direction of the light irradiated to the cathode can be specifically referred to fig. 2, and fig. 2 is a diagram of the direction of the light irradiated to the cathode layer in the first embodiment of the display panel shown in fig. 1.
On one hand, the ambient light incident from the center of the hemispherical recess 122 can directly penetrate through the cathode layer 15 and enter the pixel defining layer 12, and the display contrast is not affected by the reflection. On the other hand, the surface of the hemispherical groove 122 enlarges the ambient light incident surface, increases the angle of the incident surface, and can reduce the occurrence of total reflection to a certain extent. For example, in FIG. 2, if the incident position of the light is a planar structure, the incident angle θ1If the angle is larger than the critical angle C, total reflection occurs; if the light incident position is a groove structure, the incident angle becomes theta2Less than critical angle CIt can be reflected into the pixel defining layer 12, i.e. reflection is reduced.
In this embodiment, the diameter of the hemispherical recesses 122 is less than or equal to 5 μm, and the hemispherical recesses 122 are arranged in an array on the pixel defining layer 12. The formation of the groove 122 may be prepared by a process of development exposure.
The above is provided by the shape of the cathode layer 15 so that more light enters the pixel defining layer 12, thereby reducing reflection of light. The light entering the pixel definition layer 12 may be further processed to reduce reflection of the light.
In this embodiment, the refractive index of the pixel defining layer 12 is lower than that of the planarization layer 11, and the light emitted to the planarization layer 11 through the pixel defining layer 12 is refracted and enters the planarization layer 11 without being totally reflected.
Because the pixel definition layer 12 is disposed on the same layer as the anode layer 13, the organic layer 14 and the cathode layer 15, the pixel definition layer 12 can be further made of a transparent material on the basis of the above design, so as to improve the light emitting efficiency of the display panel.
In this embodiment, the groove 122 is formed on the pixel defining layer 12, and the cathode layer 15 is disposed conformally with the pixel defining layer 12, so that the cathode layer 15 also has a groove structure, thereby reducing the reflection of the ambient light at the cathode layer 15; and for the flexible display panel, the groove structure can reduce bending stress and is beneficial to bending display of the display panel. Further, in the present embodiment, the refractive index of the pixel defining layer 12 is lower than the refractive index of the planarization layer 11, so that the problem of total reflection of the light emitted from the pixel defining layer 12 to the planarization layer 11 can be reduced. Also, the pixel defining layer 12 may be made of a transparent material to improve light emitting efficiency. Specifically, a transparent photoresist material such as a siloxane-based organic resist can be used.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a display panel according to a second embodiment of the present application. The display panel 200 of the present embodiment includes a planarization layer 21, a pixel defining layer 22, an anode layer 23, an organic layer 24, and a cathode layer 25.
In the display panel 200 of the present embodiment, the pixel defining layer 22 is formed on the planarization layer 21, and a plurality of pixel regions 221 are defined, wherein each pixel region 221 corresponds to each pixel of the display panel 200; an anode layer 23 and an organic layer 24 sequentially formed on the planarization layer 21 and positioned in the pixel region 221; a cathode layer 25 is formed on the organic layer 24 and the pixel defining layer 22. The difference from the display panel 100 of the above embodiment is that the nanoparticles 26 are formed between the cathode layer 25 and the organic layer 24. That is, for the display panel 200 of the present embodiment, on the basis of the display panel 100, in addition to the groove 222 disposed on the pixel defining layer 22, the refractive index of the pixel defining layer 22 is smaller than the refractive index of the planarization layer 21, the pixel defining layer 22 is designed by using a transparent material or the like, and further, the nanoparticles 26 realize scattering of the emitted light from the organic layer 24, so as to improve the viewing angle.
Specifically, before forming the cathode layer 25, the nanoparticles 26 are formed on the organic layer 24, specifically, silver nanoparticles are used, and a thin layer of pure silver with a thickness of 1-2 nm is formed by an evaporation process, i.e., the nanoparticles are formed on the organic layer 24 to serve as a scattering layer for light emitted from the organic layer 24. In addition, with the silver material, photons generated by the organic layer 24 reach the surface of the silver nanoparticles, and a surface plasmon resonance effect is also generated, so that the brightness of light emission is improved, and the viewing angle is improved.
Referring to fig. 4 and 5, fig. 4 is a schematic structural diagram of an anode layer in a third embodiment of the display panel of the present application, and fig. 5 is another schematic structural diagram of the anode layer in a fourth embodiment of the display panel of the present application. The display panel 300 of the present embodiment includes a planarization layer, a pixel defining layer 32, an anode layer 33, an organic layer, and a cathode layer.
The difference between the display panel 300 of the present embodiment and the display panel 100 of the previous embodiment is the design of the anode layer 33, and the display panel 300 of the present embodiment can integrate the design of the display panel 200.
Specifically, in the present embodiment, the pixel defining layer 32 is opaque, and may be made of an opaque material, or only the outer surface of the pixel defining layer is covered by an opaque material, wherein the anode layer 33 includes a patterned conductive layer and a flat conductive layer covering the patterned conductive layer, wherein only the patterned conductive layer is patterned, and the flat conductive layer ensures that the overall shape of the anode layer is not changed.
In this embodiment, the anode layer may have a two-layer structure or a three-layer structure, and taking the three-layer structure as an example, the anode layer 33 includes a first conductive layer 331, a second conductive layer 332, and a third conductive layer 333, which are stacked, where the second conductive layer 332 is a patterned conductive layer, and the third conductive layer 333 is a flat conductive layer. That is, the second conductive layer 332 located in the middle of the anode layer 33 is patterned, so that the change of the overall shape of the anode layer 33 can be avoided, and the conductive performance and structure of the anode are not affected.
In this embodiment, the first conductive layer 331 and the third conductive layer 333 are made of ITO, the second conductive layer 332 is made of silver, and the patterning process of the second conductive layer 332 can reduce the reflection of ambient light at the anode layer 33.
Further, the patterned layer of the second conductive layer 332 has a grating structure, which may be a sawtooth groove surface structure as shown in fig. 4, a repeated triangular prism structure as shown in fig. 5, or other structures, such as a periodic structure with a grating effect. And for the pixel regions with different light-emitting colors, the grating structures have different sizes so as to perform different treatments on the light rays with different colors.
Referring to fig. 6, fig. 6 is a schematic view illustrating a third embodiment of the display panel shown in fig. 4, in which light is irradiated to an anode layer.
In fig. 6, the grating structure is a sawtooth groove surface structure, and the grating structure includes a grating plane and a grating inclined surface, where a is the width of the grating plane, d is the width of the grating inclined surface, and a ≈ d. When light 1 is incident with the vertical grating inclined plane, a blazed grating can be formed, the luminous efficiency of the light 1 is improved, and the formula is required to be satisfied:
d×sinθ＝λ
wherein θ is selected to ensure that the reflected light of light 2 and light 3 are absorbed by the pixel defining layer 32. The light rays 1, 2 and 3 are light rays with different colors respectively.
For example, in the red pixel area, the d value of the red pixel area can be calculated through the wavelength lambda of red light; also in the blue pixel region and the green pixel region, different values of d, i.e., different grating cell sizes, can be obtained from the above formula. In this way, only light corresponding to a specific wavelength of light irradiated to the anode layer 35 can be seen by diffraction, and the light intensity is significantly increased.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an anode layer in a fourth embodiment of a display panel of the present application. The display panel 400 of the present embodiment includes a planarization layer, a pixel defining layer 42, an anode layer 43, an organic layer, and a cathode layer.
The display panel 400 of the present embodiment is different from the display panel 100 of the previous embodiment in the design of the anode layer 43, and the display panel 400 of the present embodiment can integrate the design of the display panel 200. The anode layer 43 of this embodiment is different from the anode layer 33 of the display panel 300 of the above embodiment in that the overall shape of the anode layer 43 is changed in this embodiment.
Specifically, the pixel defining layer 42 of the present embodiment is opaque, and may be made of an opaque material, or only the outer surface of the pixel defining layer is covered by an opaque material, wherein the anode layer 43 is configured as an isosceles triangle in each pixel region, and the base angle of the isosceles triangle is β; the included angle between the connecting surface of the vertex of the isosceles triangle and the top edge of the corresponding pixel area and the pixel definition layer is alpha; alpha equals beta. This structure ensures that light impinging on the anode layer 43 is absorbed by the pixel defining layer 42, which in turn reduces the reflection of ambient light. In this embodiment, besides the polarizer formed on the cathode layer, a black matrix is further disposed, and in this embodiment, the edge of the top end of the pixel region refers to the edge of the black matrix corresponding to the pixel region.
The reflection problem of ambient light can also be reduced by modifying the polarizer, please refer to fig. 8, where fig. 8 is a schematic structural diagram of the polarizer in the display panel of the present application.
The polarizer of FIG. 8 can be applied to all the above embodiments of the display panel. In the display panel 100 of the first embodiment, the polarizer 16 is formed on the cathode layer 15; the surface of the polarizer 16 away from the cathode layer 15 is a non-smooth structure, so that the problem of reflection of ambient light on the polarizer 16 is reduced.
Specifically, a patterning process is performed on the protective layer of the polarizer 16 through an etching or screen printing process, in which the height of a screen is changed, thereby forming polarizer surfaces of different thicknesses. The surface of the protective layer of the polarizer 16 may be an arc-shaped groove surface, or may be other roughened surfaces. So as to reduce surface reflection and enhance the picture display effect.
As for the display panel described above, it can be applied to a display device, as shown in fig. 9, fig. 9 is a schematic structural diagram of an embodiment of the display device of the present application.
The display device 500 of the embodiment includes the display panel 51, and the display panel 51 may be the display panel 100 and 400, which will not be described in detail. The display device 500 may be a mobile phone, a computer, a television, or the like. The display device 500 using the display panel has no problem of glare and the like, and has a good display effect.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (8)
1. A display panel, comprising:
a planarization layer;
the pixel defining layer is formed on the planarization layer and is defined with a plurality of pixel regions;
the anode layer and the organic layer are sequentially formed on the planarization layer and are positioned in the pixel area;
a cathode layer formed on the pixel defining layer and the organic layer;
a plurality of grooves are formed on the surface of the pixel defining layer, which is in contact with the cathode layer, the grooves are arranged at intervals, and the cathode layer and the pixel defining layer are arranged in a conformal manner;
the pixel defining layer is opaque, and the anode layer comprises a patterned conductive layer and a flat conductive layer covering the patterned conductive layer; the patterned conducting layer is of a grating structure and comprises a plurality of grating units, the grating units are of a sawtooth groove surface structure, the sawtooth groove surface structure comprises a grating plane, a grating inclined plane and pixel areas with different light-emitting colors, and the grating units are different in size.
2. The display panel of claim 1, wherein the groove has a curved inner surface.
3. The display panel according to claim 2, wherein the groove is a hemispherical groove having a diameter of 5 μm or less.
4. The display panel according to claim 1, wherein a refractive index of the pixel defining layer is lower than a refractive index of the planarization layer.
5. The display panel of claim 1, wherein nanoparticles are formed between the cathode layer and the organic layer.
6. The display panel of claim 1, wherein the pixel defining layer is opaque, the anode layer is an isosceles triangle at each pixel region, and a base angle of the isosceles triangle is β; the included angle between the connecting surface of the vertex of the isosceles triangle and the edge of the top end of the corresponding pixel area and the pixel defining layer is alpha; the alpha is equal to the beta.
7. The display panel according to claim 1, wherein the display panel comprises a polarizer formed on the cathode layer; the surface of the polaroid, which is far away from the cathode layer, is of a non-smooth structure.
8. A display device characterized in that it comprises a display panel according to any one of claims 1 to 7.
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| US11895867B2 (en) | 2019-12-17 | 2024-02-06 | Boe Technology Group Co., Ltd. | Method of reducing color breakup of reflection of ambient light in display panel, display panel, display apparatus, and method of fabricating display panel |
| CN111430571A (en) * | 2020-04-09 | 2020-07-17 | 武汉华星光电半导体显示技术有限公司 | O L ED display panel |
| CN114361359B (en) * | 2021-12-29 | 2023-10-27 | 武汉天马微电子有限公司 | Display panel and display device |
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