CN114695796A - Display panel and display device - Google Patents

Display panel and display device Download PDF

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Publication number
CN114695796A
CN114695796A CN202210318350.7A CN202210318350A CN114695796A CN 114695796 A CN114695796 A CN 114695796A CN 202210318350 A CN202210318350 A CN 202210318350A CN 114695796 A CN114695796 A CN 114695796A
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CN
China
Prior art keywords
light
transparent area
light extraction
substrate
display substrate
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Pending
Application number
CN202210318350.7A
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Chinese (zh)
Inventor
宋文峰
吴长晏
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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Publication date
Application filed by BOE Technology Group Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to CN202210318350.7A priority Critical patent/CN114695796A/en
Publication of CN114695796A publication Critical patent/CN114695796A/en
Pending legal-status Critical Current

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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
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • 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
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/856—Arrangements for extracting light from the devices comprising reflective means
    • 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
    • H10K59/30—Devices specially adapted for multicolour light emission

Abstract

The invention relates to the field of display, and discloses a display panel and a display device, wherein the display panel comprises a substrate base plate; the light-emitting structure is positioned on one side of the substrate, and the orthographic projection of the light-emitting structure on the substrate base plate is only positioned in the first transparent area; the first light extraction structure is positioned on the light emitting side of the light emitting structure, the orthographic projection of the first light extraction structure on the substrate is positioned in the second transparent area, and the first light extraction structure is used for focusing light rays positioned in the second transparent area. The first light extraction structure is used for focusing light, and when ambient light enters the display substrate from one side of the substrate positioned in the second transparent area, the first light extraction structure focuses the divergent ambient light, so that the ambient light is emitted from the second transparent area as much as possible, the ambient light entering the first transparent area is reduced, the diffraction intensity of the ambient light entering the first transparent area from the second transparent area can be reduced by the first light extraction structure, and the contrast and display image quality of the first transparent area and the second transparent area are ensured.

Description

Display panel and display device
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
An Organic Light-Emitting Diode (OLED) device has become a next generation display technology with great competitiveness and development prospect due to a series of advantages of full solid state structure, high brightness, full viewing angle, fast response speed and flexible display lamp.
The transparent OLED display screen, namely the self-luminous transparent organic OLED screen, is made of OLED, adopts a transparent process, and is increasingly applied to commercial scenes such as markets and hotels pursuing spatial and aesthetic feelings; transparency and diffraction ghosting are important evaluation indexes of transparent display image quality, and higher transparency and lower diffraction ghosting defects are always pursued for transparent display panels.
Disclosure of Invention
The invention discloses a display panel and a display device, which are used for improving the display effect of a transparent display panel.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, the present invention provides a display substrate, which is divided into a first transparent region and a second transparent region;
the display substrate comprises a substrate base plate;
the light-emitting structure is positioned on one side of the substrate, and the orthographic projection of the light-emitting structure on the substrate base plate is only positioned in the first transparent area;
and the first light taking-out structure is positioned on the light-emitting side of the light-emitting structure, the orthographic projection of the first light taking-out structure on the substrate is positioned in the second transparent area, and the first light taking-out structure is used for focusing light rays positioned in the second transparent area.
The display substrate provided by the invention is divided into a first transparent area and a second transparent area, the display substrate also comprises a substrate and a light-emitting structure positioned on one side of the substrate, the orthographic projection of the light-emitting structure on the substrate is only positioned in the first transparent area, namely the orthographic projection of the light-emitting structure on the substrate is positioned in the first transparent area, the second transparent area is not provided with the light-emitting structure, the light-emitting side of the light-emitting structure is provided with a first light extraction structure which is positioned in the second transparent area and is used for focusing light, when ambient light enters the display substrate from one side of the substrate positioned in the second transparent area, the first light extraction structure focuses divergent ambient light, so that the ambient light is emitted from the second transparent area as much as possible, the ambient light entering the first transparent area is reduced, and the diffraction intensity of the ambient light entering the first transparent area from the second transparent area can be reduced by the first light extraction structure, thereby ensuring the contrast and display image quality of the first transparent area and the second transparent area.
Optionally, the display substrate further includes a second light extraction structure located on the light exit side of the light-emitting structure, and an orthographic projection of the second light extraction structure on the substrate is located in the first transparent area, and the second light extraction structure is configured to focus light rays located in the first transparent area.
Optionally, the first light extraction structure and the second light extraction structure are located in the same film layer to form a light extraction layer.
Optionally, the first light extraction structure and the second light extraction structure each include a plurality of light extraction microstructures, the light extraction microstructures form hemispherical light extraction microstructures along a side away from the light emitting structure, and the hemispherical light extraction microstructures are protruded along a side away from the light emitting structure.
Optionally, any two adjacent hemispherical microstructures are closely arranged and in contact with each other.
Optionally, the display substrate further includes a light-adjusting structure for totally reflecting light, and the light-adjusting structure is located on a side of the first light extraction structure away from the substrate;
the dimming structure is located at the junction of the two areas of the first transparent area and the second transparent area.
Optionally, the light-adjusting structure includes a plurality of light-adjusting microstructures, a hemispherical light-adjusting microstructure is formed on one side of the light-adjusting microstructure facing the light-emitting structure, and the hemispherical light-adjusting microstructure is protruded along one side facing the light-emitting structure.
Optionally, the display substrate further includes a filling layer located between the layer where the first light extraction structure is located and the layer where the dimming structure is located; the filling layer has a refractive index smaller than that of the first light extraction structure.
Optionally, the display substrate further includes a thin film encapsulation layer located between the light emitting structure and the layer where the first light extraction structure is located.
Optionally, the display substrate further includes a protective layer located on a side of the dimming structure facing away from the substrate.
In a second aspect, the present invention provides a display device, including the display substrate of any one of the first aspect.
Drawings
FIG. 1 is a graph of the aperture ratio of a transparent region in the prior art as a function of diffraction intensity;
fig. 2 is a schematic structural diagram of a display substrate according to an embodiment of the disclosure;
FIG. 3 is a schematic structural diagram of another display substrate according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another display substrate according to an embodiment of the present invention;
FIG. 5 is a schematic view illustrating a light path of a light extraction layer in a display substrate according to an embodiment of the present invention;
fig. 6 is a schematic plan view illustrating a first transparent region and a second transparent region in a display substrate according to an embodiment of the present invention;
fig. 7 is a schematic plan view illustrating a first transparent region and a second transparent region of a display substrate according to another embodiment of the present invention.
Icon: a-a first transparent region; b-a second transparent region; 1-a light emitting structure; 11-pixel cells; 111-sub-pixels; 2-a light extraction layer; 21-a first light extraction structure; 22-a second light extraction structure; 23-light extraction microstructure; 3-a dimming structure; 31-a dimming microstructure; 4-a filling layer; 5-a protective layer; 6-thin film encapsulation layer.
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.
The drawing scale in the present invention can be used as a reference in the actual process, but is not limited thereto. For example: the thickness and the interval of each film layer can be adjusted according to actual needs. The number of pixels in the display device and the number of sub-pixels 111 in each pixel are not limited to those shown in the drawings, and the drawings described in the present invention are only schematic structural views, and one embodiment of the present invention is not limited to shapes, numerical values, and the like shown in the drawings.
The ordinal numbers such as "first", "second", and the like in the description of the embodiments of the present invention are provided for avoiding confusion among the constituent elements, and are not limited in number.
The transparent OLED display is being applied to commercial scenes more and more, and the transparency and the diffraction ghost of the image quality are two important indexes for evaluating the transparent OLED display. The transparent OLED display screen comprises a transparent area which is not used for displaying pictures and a display area which is used for displaying the pictures, and if the proportion of the transparent area is increased, the improvement of the integral transparency of the transparent OLED display screen and the improvement of poor diffraction ghosting are facilitated; however, the pixel density unit (PPI, Pixels Per inc) displayed on the whole transparent OLED display screen is also reduced, which is not favorable for the whole display performance of the product. The pixel density unit represents the number of pixels per inch. Thus, a higher PPI value means that the display screen can display images with higher density. Of course, the higher the density displayed, the higher the fidelity.
Fig. 1 is a graph of the relationship between the aperture ratio of the transparent region and the diffraction intensity in the prior art, as shown in fig. 1, as the aperture ratio of the transparent region increases, the diffraction intensity gradually decreases, and the diffraction ghost also decreases as the diffraction intensity decreases, so the lower the diffraction intensity, the better the diffraction intensity, but the lower the diffraction intensity, the aperture ratio of the transparent region increases, and the aperture ratio of the transparent region is: the ratio of the transparent area to the whole area, that is, the ratio of the transparent area is increased, which will affect the display effect of the transparent OLED display, so that the pixel density unit (PPI, Pixels Per inc) displayed by the transparent OLED display will be correspondingly reduced, which is not favorable for the overall display performance of the product.
Therefore, in order to ensure the display effect of the transparent OLED display panel, the proportion of the pixel region and the transparent region needs to be maintained, and in the following manner, the diffraction intensity needs to be reduced without increasing the proportion of the transparent region.
As shown in fig. 2, an embodiment of the present invention provides a display substrate, which is divided into a first transparent area a and a second transparent area B;
the display substrate comprises a substrate;
the light-emitting structure 1 is positioned on one side of the substrate, and the orthographic projection of the light-emitting structure 1 on the substrate is only positioned in the first transparent area A;
the first light extraction structure 21 is located on the light emitting side of the light emitting structure 1, the orthographic projection of the first light extraction structure 21 on the substrate is located in the second transparent region B, and the first light extraction structure 21 is used for focusing light rays located in the second transparent region B.
It should be noted that the display substrate provided by the present invention is divided into a first transparent area a and a second transparent area B, the display substrate further includes a substrate and a light emitting structure 1 located on one side of the substrate, the orthographic projection of the light emitting structure 1 on the substrate is only located in the first transparent area a, that is, the orthographic projection of the light emitting structure 1 on the substrate is located in the first transparent area a, the light emitting structure 1 is not located in the second transparent area B, the light emitting side of the light emitting structure 1 is provided with a first light taking out structure 21, the first light taking out structure 21 is located in the second transparent area B, the first light taking out structure 21 is used for focusing light, when ambient light enters the display substrate from the substrate side of the second transparent area B, the first light taking out structure 21 focuses the divergent ambient light, so that the ambient light is emitted from the second transparent area B as much as possible, and the ambient light entering the first transparent area a is reduced, the first light extraction structure 21 can reduce the diffraction intensity of the ambient light entering the first transparent area a from the second transparent area B, thereby ensuring the contrast and display image quality of the first transparent area a and the second transparent area B.
With continued reference to fig. 2, a filling layer 4 is formed on the side of the first light extraction structure 21 facing away from the light emitting structure 1, the filling layer 4 serves to planarize the first light extraction structure 21, and of course, a protection layer 5 is further provided on the side of the filling layer 4 facing away from the first light extraction structure 21, and the protection layer 5 and the filling layer 4 may be fabricated together in order to simplify the fabrication process.
As shown in fig. 3, in some specific embodiments, the display substrate further includes a second light extraction structure 22 located at the light-emitting side of the light-emitting structure 1, and an orthographic projection of the second light extraction structure 22 on the substrate is located in the first transparent region a, and the second light extraction structure 22 is used for focusing the light rays located in the first transparent region a.
The first transparent area A and the second transparent area B are both provided with light extraction structures, namely a second light extraction structure 22 is arranged in the first transparent area A, a first light extraction structure 21 is arranged in the second transparent area B, the first light extraction structure 21 is used for focusing light, when ambient light enters the display substrate from one side of the substrate positioned in the second transparent area B, the first light extraction structure 21 focuses the scattered ambient light, so that the ambient light is emitted from the second transparent area B as much as possible, the ambient light entering the first transparent area A is reduced, the first light extraction structure 21 can reduce the diffraction intensity of the ambient light entering the first transparent area A from the second transparent area B, and the contrast and the display image quality of the first transparent area A and the second transparent area B are further ensured; the second light taking-out structure 22 focuses light in a collimating manner, when the second light taking-out structure 22 focuses the emergent light of the light-emitting structure 1, the second light taking-out structure 22 can change the direction of the emergent light of the light-emitting structure 1, so that the emergent light of the divergent light-emitting structure 1 is focused, the emergent light intensity of the light-emitting structure 1 in the first transparent area A is increased, the emergent light of the light-emitting structure 1 from the second transparent area B is reduced, the mutual influence between the first transparent area A and the second transparent area B is weakened, namely the mutual influence between the light-emitting structure 1 and ambient light is weakened, the mutual influence between the pixel area and the transparent area is weakened, and therefore the integral display image quality of the transparent OLED screen can be improved.
For convenience of fabrication, the first light extraction structure 21 and the second light extraction structure 22 are located in the same film layer to form the light extraction layer 2. The process materials of the first light extraction structure 21 and the second light extraction structure 22 are the same, i.e. the refractive index of the material of the light extraction layer 2 is 1.8-2.2.
As will be explained in detail below with respect to the first light extraction structure 21 and the second light extraction structure 22, for example, each of the first light extraction structure 21 and the second light extraction structure 22 includes a plurality of light extraction microstructures 23, the light extraction microstructures 23 form hemispherical light extraction microstructures 23 along a side facing away from the light emitting structure 1, and the hemispherical light extraction microstructures 23 are protruded along a side facing away from the light emitting structure 1. Any two adjacent hemispherical microstructures are closely arranged and contacted with each other. The hemispherical light extraction microstructures 23 can increase the emergent angle of light, and improve the light extraction efficiency of the display substrate. The hemispherical shape is formed by the exposure etching secondary heat treatment process with respect to the hemispherical light extracting microstructure 23.
Because the second light extraction structure 22 is located in the first transparent area a, when the first transparent area a is a pixel area, because there are a plurality of sub-pixels 111 with different colors in the pixel area, in order to avoid color mixing, the second light extraction structure 22 may be divided into a plurality of second light extraction sub-structures, a certain interval is provided between any two adjacent second light extraction sub-structures, and each second light extraction sub-structure is arranged in one-to-one correspondence with the sub-pixel 111, so that color mixing of the adjacent sub-pixels 111 can be effectively avoided.
In fig. 3 and 4, in some specific embodiments, the display substrate further includes a light-adjusting structure 3 for total reflection of light, the light-adjusting structure 3 is located on a side of the first light extraction structure 21 facing away from the substrate;
the light-adjusting structure 3 is located at the intersection of the two regions of the first transparent region a and the second transparent region B.
The dimming structure 3 arranged at the junction of the first transparent area A and the second transparent area B is equivalent to the process material of the light extraction layer 2, and due to the existence of the dimming structure 3, the total reflection critical angle of the upper surface of the dimming structure 3 and other film layers in contact with the upper surface of the dimming structure is reduced, wherein the total emission critical angle is that when the incident angle is larger than the critical angle, light rays are totally reflected, so that the smaller the critical angle is, more light rays are totally emitted, when the total reflection is increased, the transmitted light is inevitably reduced, namely the light rays emitted by the light emitting structure 1 of the first transparent area A are weakened to the second transparent area B, and the light rays emitted by the ambient light of the second transparent area B to the first transparent area A are weakened, so that the overall display image quality is improved.
As to the light-adjusting structure 3 specifically includes a plurality of light-adjusting microstructures 31, for example, a hemispherical light-adjusting microstructure 31 is formed on a side of the light-adjusting microstructure 31 facing the light-emitting structure 1, and the hemispherical light-adjusting microstructure 31 is protruded along the side facing the light-emitting structure 1. The shape of the light-adjusting microstructure 31 is inverted hemispherical.
With reference to fig. 3, after the light emitting structure is adjusted by the light extraction layer and the light adjusting structure, the emergent light from the light emitting structure to the first transparent area is enhanced, and the emergent light is reduced by total reflection of the emergent light from the light adjusting structure to the second transparent area; emergent light from the ambient light to the second transparent area through the first light taking-out structure in the light taking-out layer is enhanced, and emergent light from the light adjusting structure to the first transparent area is weakened. Namely, the mutual influence of the light rays of the first transparent area and the second transparent area is weakened, namely, the mutual influence of the light rays of the ambient light and the light-emitting structure is weakened, so that the overall display image quality can be improved.
In some embodiments, the display substrate further comprises a filling layer 4 located between the layer where the first light extraction structure 21 is located and the layer where the light modulating structure 3 is located; of course, when the light adjusting structure 3 is not present, the filling layer 4 covers the layer where the first light extraction structure 21 is located, the specific refractive index of the filling layer 4 is smaller than the refractive index of the first light extraction structure 21, and the refractive index of the filling layer 4 is also smaller than the refractive index of the second light extraction structure 22.
For example, the material of the filling layer 4 is polyimide or epoxy resin, the refractive index is 1.5 to 1.6, the refractive indices of the first light extraction structure 21 and the second light extraction structure 22 are both 1.8 to 2.2, and the refractive indices of the first light extraction structure 21 and the second light extraction structure 22 may be different. And the refractive indices of the first light extraction structure 21 and the second light extraction structure 22 may be adjusted as needed, and are not particularly limited herein; also, the refractive index of the filling layer 4 may be adjusted as needed, and is not particularly limited herein.
The principle of light collection by the first light extraction structure 21 and the second light extraction structure 22 will be described below, but as shown in fig. 5, the refractive index of each of the first light extraction structure 21 and the second light extraction structure 22 is larger than the refractive index of the filling layer 4. Therefore, the emergent light of the light emitting structure 1 is from dense light to sparse light, and the incident angle is smaller than the emergent angle, so that the light emitted by the light emitting structure 1 is focused in the positive direction after passing through the second light extraction structure 22, and basically all the light emitted by the light emitting structure 1 is focused through the second light extraction structure 22 and emitted from the first transparent area a; similarly, the ambient light in the second transparent region B is dense to sparse, and the incident angle is smaller than the emergent angle, so that the ambient light is focused in the positive direction after passing through the first light extraction structure 21, and substantially all of the ambient light is focused through the first light extraction structure 21 and emitted from the second transparent region B.
With continued reference to fig. 2-4, in some embodiments, the display substrate further includes a thin film encapsulation layer 6 between the light emitting structure 1 and the layer where the first light extraction structure 21 is located.
The thin film encapsulation layer 6 protects the organic light emitting structure 1 in the light emitting structure 1 from moisture and/or oxygen, thereby improving the lifespan.
In some embodiments, the display substrate further comprises a protective layer 5 on a side of the light-modulating structure 3 facing away from the base substrate. For example, polyimide or epoxy resin materials with refractive index of 1.5-1.6 can be used as the protective layer 5. It will be appreciated that the protective layer 5 and the filler layer 4 may be prepared together for ease of manufacture if no dimming structure 3 is present between the protective layer 5 and the filler layer 4.
In fig. 6 and 7, in order to facilitate understanding of the first transparent region a and the second transparent region B, the light emitting structure 1 includes a plurality of pixel units 11, each pixel unit 11 further includes at least two sub-pixels 111 with different colors, the first transparent region a is a pixel region, the second transparent region B can be understood as a transparent region, and the second transparent region B is disposed around the first transparent region a; the integral proportion of the first transparent area A and the second transparent area B in the transparent OLED display screen is not changed.
For example, the first transparent region a may be a plurality of pixel cells 11 in a dotted line frame as shown in fig. 6 as a pixel region, and the other region except the pixel cells 11 is regarded as a second transparent region B; of course, the first transparent area a may be a plurality of sub-pixels 111 indicated by a dashed line frame in fig. 7 as a pixel area, and an area other than the sub-pixels 111 in the dashed line frame may be regarded as the second transparent area B.
In a second aspect, an embodiment of the present invention provides a display device, including the display substrate of any one of the first aspects.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (11)

1. A display substrate is characterized by being divided into a first transparent area and a second transparent area;
the display substrate comprises a substrate;
the light-emitting structure is positioned on one side of the substrate, and the orthographic projection of the light-emitting structure on the substrate base plate is only positioned in the first transparent area;
the first light taking-out structure is positioned on the light emitting side of the light emitting structure, the orthographic projection of the first light taking-out structure on the substrate is positioned in the second transparent area, and the first light taking-out structure is used for focusing light rays positioned in the second transparent area.
2. The display substrate of claim 1, further comprising a second light extraction structure located at a light exit side of the light emitting structure, wherein an orthographic projection of the second light extraction structure on the substrate is located in the first transparent region, and the second light extraction structure is configured to focus light rays located in the first transparent region.
3. The display substrate of claim 2, wherein the first light extraction structure and the second light extraction structure are in a same film layer to form a light extraction layer.
4. The display substrate of claim 2, wherein the first and second light extraction structures each comprise a plurality of light extraction microstructures, the light extraction microstructures forming hemispherical light extraction microstructures along a side facing away from the light emitting structure, the hemispherical light extraction microstructures being convex along a side facing away from the light emitting structure.
5. The display substrate of claim 4, wherein any two adjacent hemispherical microstructures are closely arranged and contact each other.
6. A display substrate according to any one of claims 1 to 5, wherein the display substrate further comprises a light-modulating structure for total reflection of light, the light-modulating structure being located at a side of the first light extraction structure facing away from the substrate;
the dimming structure is located at the junction of the two areas of the first transparent area and the second transparent area.
7. The display substrate according to claim 6, wherein the light-adjusting structure comprises a plurality of light-adjusting microstructures, and a side of the light-adjusting microstructures facing the light-emitting structure forms a hemispherical light-adjusting microstructure, and the hemispherical light-adjusting microstructures are protruded along a side facing the light-emitting structure.
8. The display substrate of claim 6, further comprising a filling layer between the layer of the first light extraction structure and the layer of the dimming structure; the filling layer has a refractive index smaller than that of the first light extraction structure.
9. The display substrate of claim 1, 2, 3, 4, 5, 7, or 8, wherein the display substrate further comprises a thin film encapsulation layer between the light emitting structure and the layer of the first light extraction structure.
10. The display substrate of claim 6, further comprising a protective layer on a side of the light modulating structure facing away from the substrate.
11. A display device comprising the display substrate according to any one of claims 1 to 10.
CN202210318350.7A 2022-03-29 2022-03-29 Display panel and display device Pending CN114695796A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210318350.7A CN114695796A (en) 2022-03-29 2022-03-29 Display panel and display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210318350.7A CN114695796A (en) 2022-03-29 2022-03-29 Display panel and display device

Publications (1)

Publication Number Publication Date
CN114695796A true CN114695796A (en) 2022-07-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210318350.7A Pending CN114695796A (en) 2022-03-29 2022-03-29 Display panel and display device

Country Status (1)

Country Link
CN (1) CN114695796A (en)

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