Display panel

Abstract

A display panel, comprising a first transparent substrate and a second transparent substrate, an accommodation cavity being formed between the second transparent substrate and the first transparent substrate; black charged particles are arranged in the accommodation cavity; the first transparent substrate comprises a first electrode and a second electrode, the first electrode being arranged in a pixel area, and the second electrode being arranged in a non-pixel area; in a transparent display mode, the black charged particles are located in the pixel area, and, in a non-transparent display mode, the black charged particles are located in the non-pixel area.

Description

Display panel

[0001] This application claims priority to Chinese patent application No. 202311799042.1 filed on December 25, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of display panels, and in particular to a display panel. Background Art

[0003] Micro LED (Micro-LED) display panels, as a new type of high-definition display panel, offer advantages such as high contrast, wide color gamut, long lifespan, and fast response time. They are widely used in transparent display applications such as automotive glass and store windows. However, when the surrounding environment of a Micro LED display panel is bright, the displayed image overlaps with the surrounding environment, resulting in low contrast and making the displayed image difficult to discern, thus affecting the display quality. Therefore, improving the contrast of Micro LED display panels in bright ambient light is a technical problem that needs to be solved urgently. SUMMARY OF THE INVENTION

[0004] Embodiments of the present application provide a display panel to improve the display contrast of the display panel.

[0005] An embodiment of the present application provides a display panel, including:

[0006] a first transparent substrate;

[0007] a second transparent substrate, the second transparent substrate being opposite to the first transparent substrate, a receiving cavity being formed between the second transparent substrate and the first transparent substrate, and a plurality of light-emitting devices being provided on a surface of the second transparent substrate facing away from the first transparent substrate;

[0008] a plurality of black charged particles, wherein the black charged particles are disposed in the accommodating cavity;

[0009] In which, the display panel includes a pixel area corresponding to the light-emitting device and a non-pixel area located outside the pixel area, the first transparent substrate includes a first electrode and a second electrode, the first electrode is arranged in the pixel area, and the second electrode is arranged in the non-pixel area. In a transparent display mode, the black charged particles are gathered in the pixel area under the action of the electric field of the first electrode and / or the second electrode, and in a non-transparent display mode, the black charged particles are gathered in the non-pixel area under the action of the electric field of the first electrode and / or the second electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 is a schematic diagram of a display panel of the present application;

[0011] FIG2 is a schematic diagram of the positions of black charged particles in the display panel of the present application in a transparent display mode;

[0012] FIG3 is a schematic diagram of a display effect corresponding to the display panel shown in FIG2 in a transparent display mode;

[0013] FIG4 is a schematic diagram of the positions of black charged particles in the display panel of the present application in a non-transparent display mode;

[0014] FIG. 5 is a schematic diagram illustrating a display effect corresponding to the display panel shown in FIG. 4 in a non-transparent display mode.

[0015] 100 - first transparent substrate; 200 - second transparent substrate; 300 - black charged particles; 400 - receiving cavity; 500 - first limiting portion; 510 - retaining wall; 600 - pixel area; 700 - non-pixel area; 800 - light-emitting device. Modes for Carrying Out the Invention

[0016] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. The technical solutions described below are only used to explain and illustrate the ideas of the present application and should not be regarded as limiting the scope of protection of the present application.

[0017] In addition, the terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different technical features. The term "plurality" and similar words mean two or more, unless otherwise expressly limited.

[0018] As a new type of high-definition display panel, Micro LED display panels offer advantages such as high contrast, wide color gamut, long lifespan, and fast response speed. They are widely used in transparent display scenarios such as automotive glass and store windows. However, when the surrounding environment of a Micro LED display panel is bright, the displayed image overlaps with the surrounding environment, resulting in low contrast, making the displayed image content difficult to recognize, and thus affecting the display quality of the display panel. Therefore, how to improve the contrast of Micro LED display panels displayed in relatively bright ambient light is a technical problem that needs to be solved urgently.

[0019] An embodiment of the present application provides a display panel, including:

[0020] a first transparent substrate;

[0021] a second transparent substrate, the second transparent substrate being opposite to the first transparent substrate, a receiving cavity being formed between the second transparent substrate and the first transparent substrate, and a plurality of light-emitting devices being provided on a surface of the second transparent substrate facing away from the first transparent substrate;

[0022] a plurality of black charged particles, wherein the black charged particles are disposed in the accommodating cavity;

[0023] In which, the display panel includes a pixel area corresponding to the light-emitting device and a non-pixel area located outside the pixel area, the first transparent substrate includes a first electrode and a second electrode, the first electrode is arranged in the pixel area, and the second electrode is arranged in the non-pixel area. In a transparent display mode, the black charged particles are configured to gather in the pixel area under the action of the electric field of the first electrode and / or the second electrode, and in a non-transparent display mode, the black charged particles are configured to gather in the non-pixel area under the action of the electric field of the first electrode and / or the second electrode.

[0024] In some embodiments of the present application, the electrical property of the first electrode is the same as the electrical property of the second electrode, and the electrical property of the first electrode is opposite to the electrical property of the black charged particles.

[0025] In some embodiments of the present application, the voltage applied to the first electrode is greater than the voltage applied to the second electrode.

[0026] In some embodiments of the present application, the voltage applied to the first electrode is greater than or equal to twice the voltage applied to the second electrode.

[0027] In some embodiments of the present application, a first limiting portion is provided on the surface of the second transparent substrate facing the first transparent substrate, and the first limiting portion is provided in the non-pixel area.

[0028] In some embodiments of the present application, the first limiting portion includes a plurality of retaining walls arranged in parallel, and a receiving groove is formed between two adjacent retaining walls. In the non-transparent display mode, the black charged particles are configured to gather in the receiving groove under the action of the electric field of the first electrode and / or the second electrode.

[0029] In some embodiments of the present application, the sidewall of the receiving groove is an arc-shaped curved surface, and the center of curvature of the arc-shaped curved surface and the first transparent substrate are both located on the same side of the second transparent substrate.

[0030] In some embodiments of the present application, the sidewall of the accommodating groove is an inclined surface, and the opening area of ​​the surface of the accommodating groove close to the first transparent substrate is larger than the opening area of ​​the surface of the accommodating groove away from the first transparent substrate.

[0031] In some embodiments of the present application, the material of the first limiting portion is a transparent organic material.

[0032] In some embodiments of the present application, the electrical properties of the black charged particles are positive, and the electrical properties of the first electrode and the second electrode are negative.

[0033] Beneficial effects of this application:

[0034] The present application provides a display panel, comprising a first transparent substrate, a second transparent substrate, and a plurality of black charged particles; the second transparent substrate is opposite to the first transparent substrate, a receiving cavity is formed between the second transparent substrate and the first transparent substrate, and a plurality of light-emitting devices are provided on the surface of the second transparent substrate facing away from the first transparent substrate; the black charged particles are arranged in the receiving cavity; wherein, the display panel comprises a pixel area corresponding to the light-emitting device and a non-pixel area outside the pixel area, the first transparent substrate comprises a first electrode and a second electrode, the first electrode is arranged in the pixel area, and the second electrode is arranged in the non-pixel area, in a transparent display mode, the black charged particles are gathered in the pixel area under the action of the electric field of the first electrode and / or the second electrode, and in a non-transparent display mode, the black charged particles are gathered in the non-pixel area under the action of the electric field of the first electrode and / or the second electrode. By setting the display panel to include a pixel area corresponding to the light-emitting device and a non-pixel area located outside the pixel area, the first transparent substrate includes a first electrode and a second electrode, the first electrode is set in the pixel area, and the second electrode is set in the non-pixel area. During transparent display, the black charged particles can be gathered in the pixel area under the action of the electric field of the first electrode and / or the second electrode, ensuring that light can pass through the non-pixel area of ​​the display panel, thereby increasing the transmittance of light passing through the display panel. During non-transparent display, the black charged particles can be gathered in the non-pixel area under the action of the electric field of the first electrode and / or the second electrode, thereby improving the display contrast of the display panel.

[0035] An embodiment of the present application provides a display panel. Referring to FIG. 1 to FIG. 5 , the display panel includes a first transparent substrate 100 , a second transparent substrate 200 , and a plurality of black charged particles 300 .

[0036] In this embodiment, a second transparent substrate 200 opposes a first transparent substrate 100, with a housing cavity 400 formed between the second transparent substrate 200 and the first transparent substrate 100. A plurality of light-emitting devices 800 are provided on the surface of the second transparent substrate 200 facing away from the first transparent substrate 100. Black charged particles 300 are disposed within the housing cavity 400. The display panel includes a pixel region 600 corresponding to the light-emitting devices 800 and a non-pixel region 700 located outside the pixel region 600. The first transparent substrate 100 includes a first electrode and a second electrode, the first electrode being disposed in the pixel region 600 and the second electrode being disposed in the non-pixel region 700. In a transparent display mode, the black charged particles 300 are configured to gather in the pixel region 600 under the action of the electric field of the first and second electrodes; in a non-transparent display mode, the black charged particles 300 are configured to gather in the non-pixel region 700 under the action of the electric field of the first and second electrodes.

[0037] The display panel includes a pixel region 600 corresponding to the light-emitting device 800 and a non-pixel region 700 located outside the pixel region 600. The first transparent substrate 100 includes a first electrode and a second electrode, wherein the first electrode is disposed in the pixel region 600 and the second electrode is disposed in the non-pixel region 700. During transparent display, the black charged particles 300 can be gathered in the pixel region 600 under the action of the electric field of the first electrode and the second electrode, ensuring that light can pass through the non-pixel region 700 of the display panel, thereby increasing the transmittance of light passing through the display panel and improving the clarity of the displayed image. During non-transparent display, the black charged particles 300 can be gathered in the non-pixel region 700 under the action of the electric field of the first electrode and the second electrode, thereby improving the contrast of the display panel.

[0038] In some embodiments of the present application, a second transparent substrate 200 is opposed to a first transparent substrate 100, with a housing cavity 400 formed therebetween. A plurality of light-emitting devices 800 are provided on the surface of the second transparent substrate 200 facing away from the first transparent substrate 100. Black charged particles 300 are disposed within the housing cavity 400. The display panel includes a pixel region 600 corresponding to the light-emitting devices 800 and a non-pixel region 700 located outside the pixel region 600. The first transparent substrate 100 includes a first electrode and a second electrode, the first electrode being disposed in the pixel region 600 and the second electrode being disposed in the non-pixel region 700. In a transparent display mode, the black charged particles 300 are concentrated in the pixel region 600 under the action of the electric field of the first electrode. In a non-transparent display mode, the black charged particles 300 are concentrated in the non-pixel region 700 under the action of the electric field of the second electrode.

[0039] By setting the display panel to include a pixel area 600 corresponding to the light-emitting device 800 and a non-pixel area 700 located outside the pixel area 600, the first transparent substrate 100 includes a first electrode and a second electrode, the first electrode is set in the pixel area 600, and the second electrode is set in the non-pixel area 700. During transparent display, the black charged particles 300 can be gathered in the pixel area 600 under the action of the electric field of the first electrode, ensuring that light can pass through the non-pixel area 700 of the display panel, thereby increasing the transmittance of light passing through the display panel and improving the clarity of the displayed image; during non-transparent display, the black charged particles 300 can be gathered in the non-pixel area 700 under the action of the electric field of the second electrode, thereby improving the display contrast of the display panel.

[0040] In some embodiments of the present application, the electrical properties of the first electrode are the same as those of the second electrode, and the electrical properties of the first electrode are opposite to those of the black charged particles 300. By setting the electrical properties of the first electrode to be the same as those of the second electrode, and the electrical properties of the first electrode to be opposite to those of the black charged particles 300, the black charged particles 300 can be gathered from the pixel area 600 to the non-pixel area 700 or from the non-pixel area 700 to the pixel area 600 under the action of the first and second electrodes, thereby increasing the light transmittance in the transparent display mode and improving the contrast of the display panel in the non-transparent display mode.

[0041] In some embodiments of the present application, the electrical properties of the black charged particles 300 are positive, and the electrical properties of the first electrode and the second electrode are negative.

[0042] In some embodiments of the present application, the electrical properties of the black charged particles 300 are negative, and the electrical properties of the first electrode and the second electrode are positive.

[0043] In some embodiments of the present application, the voltage applied to the first electrode is greater than the voltage applied to the second electrode.

[0044] In some embodiments of the present application, the voltage applied to the first electrode is greater than or equal to twice the voltage applied to the second electrode. By setting the voltage applied to the first electrode to be greater than or equal to twice the voltage applied to the second electrode, the black charged particles 300 can be more evenly distributed within the pixel area 600. Optionally, the voltage applied to the first electrode is greater than or equal to two, three, or four times the voltage applied to the second electrode.

[0045] When it is necessary to increase the transmittance of light passing through the display panel, based on the fact that the black charged particles 300 are located in the non-pixel area 700, the first electrode and the second electrode are energized, and the voltage of the first electrode is ensured to be greater than the voltage of the second electrode. At this time, the black charged particles 300 move from the non-pixel area 700 to the pixel area 600 and gather in the pixel area 600, thereby achieving the purpose of improving the transmittance of light passing through the display panel.

[0046] When the contrast of the display panel needs to be improved, the first electrode is stopped from being energized and the second electrode remains energized. At this time, the black charged particles 300 move from the pixel area 600 to the non-pixel area 700 and gather in the non-pixel area 700, thereby achieving the purpose of improving the contrast of the display panel.

[0047] In some embodiments of the present application, a first stopper 500 is provided on the surface of the second transparent substrate 200 facing the first transparent substrate 100, and the first stopper 500 is located within the non-pixel region 700. By providing the first stopper 500, the pixel region 600 and the non-pixel region 700 can be isolated. Thus, in a transparent display mode, the black charged particles 300 are prevented from migrating from the pixel region 600 to the non-pixel region 700; in a non-transparent display mode, the black charged particles 300 are prevented from migrating from the non-pixel region 700 to the pixel region 600, thereby improving the display stability of the display panel.

[0048] In some embodiments of the present application, the first position-limiting portion 500 includes a plurality of juxtaposed retaining walls 510, with a receiving groove 520 formed between two adjacent retaining walls 510. In the non-transparent display mode, the black charged particles 300 are gathered in the receiving groove 520 under the action of the electric field of the first electrode and / or the second electrode. By configuring the first position-limiting portion 500 to include a plurality of juxtaposed retaining walls 510, with a receiving groove 520 formed between two adjacent retaining walls 510, the black charged particles 300 are gathered in the receiving groove 520 under the action of the electric field of the first electrode and / or the second electrode in the non-transparent display mode of the display panel, thereby preventing the black charged particles 300 from moving from the non-pixel area 700 to the pixel area 600, thereby improving the display stability of the display panel.

[0049] In some embodiments of the present application, the height of the retaining wall 510 in the thickness direction of the first transparent substrate 100 is smaller than the distance between the first transparent substrate 100 and the second transparent substrate 200 .

[0050] In some embodiments of the present application, the sidewalls of the receiving groove 520 are curved surfaces, and the center of curvature a of the curved surface is located on the same side of the second transparent substrate 200 as the first transparent substrate 100. By configuring the sidewalls of the receiving groove 520 as curved surfaces, and locating the center of curvature a of the curved surface on the same side as the first transparent substrate 100, the volume of the receiving groove 520 can be increased, allowing the receiving groove 520 to accommodate more black charged particles 300. Furthermore, the curved surface can serve as a guide, allowing the black charged particles 300 to more easily enter the receiving groove 520 in the non-transparent display mode.

[0051] In some embodiments of the present application, the sidewalls of the receiving groove 520 are inclined surfaces, and the opening area of ​​the surface of the receiving groove 520 on the side close to the first transparent substrate 100 is larger than the opening area of ​​the surface of the receiving groove 520 on the side away from the first transparent substrate 100. By setting the sidewalls of the receiving groove 520 as inclined surfaces, the opening area of ​​the surface of the receiving groove 520 on the side close to the first transparent substrate 100 is larger than the opening area of ​​the surface of the receiving groove 520 on the side away from the first transparent substrate 100. On the one hand, the volume of the receiving groove 520 can be increased, so that the receiving groove 520 can accommodate more black charged particles 300. On the other hand, the inclined surface can serve as a guide, so that in the non-transparent display mode, the black charged particles 300 can more easily enter the receiving groove 520.

[0052] In some embodiments of the present application, the sidewall of the receiving groove 520 is an arc-shaped curved surface, and the center of curvature of the arc-shaped curved surface and the first transparent substrate 100 are located on different sides of the second transparent substrate 200 .

[0053] In some embodiments of the present application, a second limiting portion is provided on the surface of the second transparent substrate 200 facing the first transparent substrate 100 , and the second limiting portion is located within the pixel area 700 .

[0054] In some embodiments of the present application, the second limiting portion is a groove located in the pixel area 600 .

[0055] In some embodiments of the present application, the sidewall of the groove is an arc-shaped curved surface, and the center of curvature of the arc-shaped curved surface and the first transparent substrate 100 are both located on the same side of the second transparent substrate 200 .

[0056] In some embodiments of the present application, the sidewall of the groove is an arc-shaped curved surface, and the center of curvature of the arc-shaped curved surface and the first transparent substrate 100 are located on different sides of the second transparent substrate 200 .

[0057] In some embodiments of the present application, the sidewall of the groove is an inclined surface, and the opening area of ​​the surface of the groove close to the first transparent substrate 100 is larger than the opening area of ​​the surface of the groove away from the first transparent substrate 100.

[0058] In some embodiments of the present application, the first limiting portion 500 is made of a transparent organic material. Preferably, the transparent organic material is acrylic resin, acrylic resin, epoxy resin, or perfluoroalkoxy resin.

[0059] In some embodiments of the present application, the second electrode is covered with an electrode contact pad. By covering the second electrode with the electrode contact pad, the electrode contact pad can protect the second electrode and prevent the second electrode from being damaged, thereby improving the display stability of the display panel.

[0060] An embodiment of the present application further provides a method for preparing a display panel, the method comprising the following steps:

[0061] S100: providing a first transparent substrate 100 and a second transparent substrate 200;

[0062] S200: forming a first electrode and a second electrode on a surface of the first transparent substrate 100 on a side close to the second transparent substrate 200;

[0063] S300: Disposing a transparent organic material on the surface of the second transparent substrate 200 on the side close to the first transparent substrate 100 to form a first area and a second area on the first surface of the first transparent substrate 100;

[0064] S400: spreading pre-prepared black charged particles 300 on the second area, and removing excess black charged particles 300 on the second area;

[0065] S500: Aligning and packaging the second transparent substrate 200 on the first transparent substrate 100, and making the first region correspond to the position of the first electrode, and the second region correspond to the position of the second electrode;

[0066] S600: Turning over the packaged first transparent substrate 100 and the second transparent substrate 200 as a whole;

[0067] S700: defining a pixel region 600 and a non-pixel region 700 on the second transparent substrate 200, and making the position of the pixel region 600 correspond to the position of the first region, and the position of the non-pixel region 700 correspond to the position of the second region;

[0068] S800 : manufacturing a light-emitting device 800 on the pixel area 600 .

[0069] In some embodiments of the present application, the preparation method further comprises the following steps:

[0070] The black charged particles 300 are prepared using a sol-gel method: metal particles are placed in a reaction solvent, carbon particles agglomerate on the surface of the metal particles, thereby forming carbon black metal microspheres. The carbon black metal microspheres are separated from the reaction solvent, and the separated carbon black metal microspheres are subjected to an electric field treatment to polarize the carbon black metal microspheres, thereby making the carbon black metal microspheres positively charged, thereby producing the black charged particles 300.

[0071] In this embodiment, after step S500, the following steps are further included:

[0072] An electrode contact pad is formed on the second electrode to cover the second electrode.

[0073] The above describes in detail the specific embodiments of the present application. The above embodiments disclosed in this application are merely preferred embodiments of the present application. Those skilled in the art will appreciate that many variations and improvements can be made without departing from the spirit of the present application. These variations and improvements fall within the scope of protection defined by the claims of this application.

Claims

1. A display panel, comprising: A first transparent substrate; A second transparent substrate, the second transparent substrate being opposite to the first transparent substrate, an accommodation cavity being formed between the second transparent substrate and the first transparent substrate, and a plurality of light-emitting devices being provided on the surface of the second transparent substrate facing away from the first transparent substrate; A plurality of black charged particles, the black charged particles being provided in the accommodation cavity; The display panel includes a pixel region corresponding to the light-emitting device and a non-pixel region located outside the pixel region. The first transparent substrate includes a first electrode and a second electrode. The first electrode is disposed in the pixel region, and the second electrode is disposed in the non-pixel region. In the transparent display mode, the black charged particles are configured to aggregate in the pixel region under the action of the electric field of the first electrode and / or the second electrode; In the non-transparent display mode, the black charged particles are configured to aggregate in the non-pixel region under the action of the electric field of the first electrode and / or the second electrode.

2. The display panel according to claim 1, wherein, The electric property of the first electrode is the same as that of the second electrode, and the electric property of the first electrode is opposite to that of the black charged particles.

3. The display panel according to claim 2, wherein, The voltage applied to the first electrode is greater than the voltage applied to the second electrode.

4. The display panel according to claim 3, wherein The voltage applied to the first electrode is greater than or equal to twice the voltage applied to the second electrode.

5. The display panel according to claim 1, wherein, A first limiting portion is provided on the surface of the second transparent substrate facing the first transparent substrate, and the first limiting portion is disposed in the non-pixel region.

6. The display panel according to claim 5, wherein, The first limiting portion includes a plurality of parallelly arranged retaining walls, and an accommodation groove is formed between adjacent two retaining walls. In the non-transparent display mode, the black charged particles are configured to aggregate in the accommodation groove under the action of the electric field of the first electrode and / or the second electrode.

7. The display panel according to claim 6, wherein, The side wall of the accommodation groove is an arc-shaped curved surface, and the center of curvature of the arc-shaped curved surface and the first transparent substrate are both located on the same side of the second transparent substrate.

8. The display panel according to claim 6, wherein, The side wall of the accommodation groove is an inclined surface, and the area of the opening of the surface of the accommodation groove closer to the first transparent substrate is larger than the area of the opening of the surface of the accommodation groove farther from the first transparent substrate.

9. The display panel according to claim 5, wherein, The material of the first limiting portion is a transparent organic material.

10. The display panel according to claim 2, wherein, The electric property of the black charged particles is positive, and the electric properties of the first electrode and the second electrode are negative.

11. The display panel according to claim 2, wherein, The electric property of the black charged particles is negative, and the electric properties of the first electrode and the second electrode are positive.

12. The display panel according to claim 1, wherein, A second limiting portion is provided on the surface of the second transparent substrate facing the first transparent substrate, and the first limiting portion is disposed in the pixel region.

13. The display panel according to claim 12, wherein, The second limiting portion is a groove located in the pixel region.

14. The display panel according to claim 13, wherein, The side wall of the groove is an arc-shaped curved surface, and the center of curvature of the arc-shaped curved surface and the first transparent substrate are both located on the same side of the second transparent substrate.

15. The display panel according to claim 13, wherein, The side wall of the groove is an inclined surface, and the area of the opening of the surface of the groove closer to the first transparent substrate is larger than the area of the opening of the surface of the groove farther from the first transparent substrate.

16. The display panel according to any one of claims 1-15, wherein, An electrode contact pad is covered on the second electrode.

17. A display panel, comprising: A first transparent substrate; A second transparent substrate, the second transparent substrate being opposite to the first transparent substrate, an accommodation cavity being formed between the second transparent substrate and the first transparent substrate, and a plurality of light-emitting devices being provided on a surface of the second transparent substrate facing away from the first transparent substrate; A plurality of black charged particles, the black charged particles being disposed in the accommodation cavity; The display panel includes a pixel region corresponding to the light-emitting device and a non-pixel region located outside the pixel region. The first transparent substrate includes a first electrode and a second electrode. The first electrode is disposed in the pixel region, and the second electrode is disposed in the non-pixel region. In the transparent display mode, the black charged particles are located in the pixel region; in the non-transparent display mode, the black charged particles are located in the non-pixel region; The electric property of the first electrode is the same as that of the second electrode, and the electric property of the first electrode is opposite to that of the black charged particles. A first limiting portion is provided on a surface of the second transparent substrate facing the first transparent substrate, and the first limiting portion is disposed in the non-pixel region.

18. The display panel according to claim 17, wherein, The voltage applied to the first electrode is greater than the voltage applied to the second electrode.

19. The display panel according to claim 18, wherein, The voltage applied to the first electrode is greater than or equal to twice the voltage applied to the second electrode.

20. The display panel according to any one of claims 17-19, wherein, The first limiting portion includes a plurality of blocking walls arranged in parallel, and an accommodation groove is formed between two adjacent blocking walls. In the non-transparent display mode, the black charged particles are configured to be aggregated in the accommodation groove under the action of the electric field of the first electrode and / or the second electrode.

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