Electronic paper display panel

Abstract

The utility model relates to an electronic paper display panel which comprises a substrate, a driving array layer and an electronic ink layer which are sequentially arranged, a first display module located on the side, away from the substrate, of the electronic ink layer, and a second display module located on the side, away from the driving array layer, of the substrate. The first display module and the second display module respectively comprise at least two display screens, and any display screen is in a transparent state in a display state; any display screen is in a dark state in a non-display state. The application can satisfy simultaneous double-sided display and single-sided display, realizes multi-scene application requirements, and is convenient to use.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to an electronic paper display panel. Background Art

[0002] Electronic paper technology (E-paper) generally uses electrophoresis display technology (EPD) as a display panel, and its display effect is close to that of natural paper. The use of electronic paper is quite extensive. The first generation of products is used to replace conventional display devices, and the second generation of products includes mobile communications and personal digital assistants (PDA) and other handheld device displays. The next generation of products planned to be developed are positioned in ultra-thin displays, forming application areas related to the printing industry, such as portable e-books, e-newspapers and IC cards, which can provide reading functions and usage attributes similar to traditional books and periodicals. In addition, the electronic paper display can reflect ambient light, and the electronic paper display that does not require a backlight module can ensure eye health.

[0003] Most e-papers on the market are basically single-sided displays, which cannot meet the display needs of multiple scenarios and have a limited application range. For example, in the case of electronic tags for shopping mall products, without moving the electronic tags, the single-screen display cannot meet the needs of customers observing product information on the outside and staff observing product information on the inside at the same time. Multiple electronic tags need to be placed, which is costly and has the problem of product information asymmetry. Utility Model Content

[0004] The purpose of the present application is to provide an electronic paper display panel that can meet the needs of simultaneous double-sided display and single-sided display, realize multi-scenario application requirements, and is easy to use.

[0005] In a first aspect, an embodiment of the present application proposes an electronic paper display panel, comprising a base substrate, a driving array layer and an electronic ink layer arranged in sequence, and a first display module located on the side of the electronic ink layer away from the base substrate and a second display module located on the side of the base substrate away from the driving array layer, the first display module and the second display module respectively include at least two display screens, any display screen is transparent in the display state; and any display screen is dark in the non-display state.

[0006] In a possible embodiment, the display screen includes a first substrate and a second substrate arranged opposite to each other, and a first transparent conductive layer, an ion storage layer, an electrolyte layer, an electrochromic layer, and a second transparent conductive layer located between the first substrate and the second substrate; at least two display screens of the first display module and at least two display screens of the second display module respectively cause a change in the chromaticity of the object through an electrochemical oxidation-reduction reaction in their respective electrochromic layers to present different color states.

[0007] In a possible implementation, the electrochromic layer is an inorganic material or an organic material, the inorganic material includes tungsten trioxide, molybdenum trioxide, nickelous oxide, iridium dioxide, vanadium pentoxide, and the organic material includes polyaniline.

[0008] In a possible implementation, the electrolyte layer includes lithium niobate, lithium aluminum oxide, and lithium tantalate, which are used to conduct corresponding counter ions when an electrochemical redox reaction occurs in the electrochromic layer.

[0009] In one possible implementation, the ion storage layer is used to store corresponding counter ions when the electrochromic layer undergoes an electrochemical redox reaction to maintain charge balance; alternatively, the ion storage layer is an electrochromic material having a color change property opposite to that of the electrochromic layer.

[0010] In a possible embodiment, a display screen includes a first substrate and a second substrate that are arranged opposite to each other, and a first transparent conductive layer, a first alignment film, a liquid crystal layer, a second alignment film, and a second transparent conductive layer located between the first substrate and the second substrate, the liquid crystal layer includes a plurality of liquid crystal molecules, and the liquid crystal molecules contain dichroic dyes or high molecular polymers; at least two display screens of the first display module and at least two display screens of the second display module present different color states through the deflection angles of their respective liquid crystal molecules.

[0011] In a possible implementation, the display screen further includes a rubber frame and a plurality of support columns disposed between the first substrate and the second substrate, the rubber frame is disposed around the liquid crystal layer, and the plurality of support columns are disposed in the liquid crystal layer at intervals.

[0012] In one possible embodiment, the electronic ink layer includes a planarization layer located on the driving array layer and formed with multiple microcavity structures, microparticle capsules filled in the microcavity structures, an electrode layer covering the multiple microcavity structures, and a thin film encapsulation layer covering the electrode layer, and the driving array layer includes multiple electrodes corresponding one-to-one to the multiple microcavity structures.

[0013] In a possible implementation, the microparticle capsule includes positive electrophoretic particles and negative electrophoretic particles that are stacked, and the polarities of the electrophoretic particles in the corresponding membrane layers of the microparticle capsules in two adjacent microcavity structures are opposite.

[0014] In a possible implementation manner, the base substrate and the first base of the second display module are integrally formed; or the thin film encapsulation layer and the first base of the first display module are integrally formed.

[0015] The electronic paper display panel provided in the embodiment of the present application includes a base substrate, a drive array layer and an electronic ink layer arranged in sequence, and a first display module located on the side of the electronic ink layer away from the base substrate and a second display module located on the side of the base substrate away from the drive array layer. The first display module and the second display module respectively include at least two display screens, and any display screen is transparent in the display state; and any display screen is dark in the non-display state; thus, the electronic paper display panel can meet the needs of simultaneous double-sided display and single-sided display through multiple display screens, realize multi-scenario application requirements, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The features, advantages and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings. In the accompanying drawings, the same reference numerals are used for the same components. The accompanying drawings are not drawn according to the actual scale, but are only used to illustrate the relative position relationship. The layer thickness of some parts is exaggerated for easy understanding, and the layer thickness in the accompanying drawings does not represent the proportional relationship of the actual layer thickness.

[0017] Figure 1 A schematic diagram showing the structure of an electronic paper display panel provided by the first embodiment of the present application in a first state;

[0018] Figure 2 Show Figure 1 A schematic structural diagram of a display screen of an electronic paper display panel shown;

[0019] Figure 3 Show Figure 1 The structural schematic diagram of the electronic paper display panel shown in the second state;

[0020] Figure 4 Show Figure 1 The structure diagram of the electronic paper display panel in the third state is shown;

[0021] Figure 5 Show Figure 1 The structure diagram of the electronic paper display panel in the fourth state is shown;

[0022] Figure 6 A schematic structural diagram of a display screen of an electronic paper display panel provided in a second embodiment of the present application is shown.

[0023] Reference numerals:

[0024] 1. Substrate substrate;

[0025] 2. Drive array layer;

[0026] 3. Electronic ink layer; 30. Flattening layer; 31. Microcavity structure; 32. Microparticle capsule; 33. Electrode layer; 34. Thin film encapsulation layer;

[0027] 4. A first display module; 5. A second display module;

[0028] 10. display screen; 101. plastic frame; 102. support column;

[0029] 11. first substrate; 12. second substrate; 13. first transparent conductive layer; 14. ion storage layer; 15. electrolyte layer; 16. electrochromic layer; 17. second transparent conductive layer;

[0030] 18a, first alignment film; 18b, second alignment film; 19, liquid crystal layer. DETAILED DESCRIPTION

[0031] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least part of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of the regional structure may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0032] First embodiment

[0033] like Figures 1 to 5 As shown, the first embodiment of the present application provides an electronic paper display panel, including a base substrate 1, a driving array layer 2 and an electronic ink layer 3 arranged in sequence, and a first display module 4 located on the side of the electronic ink layer 3 away from the base substrate 1 and a second display module 5 located on the side of the base substrate 1 away from the driving array layer 2.

[0034] The first display module 4 and the second display module 5 respectively include at least two display screens 10 , and any display screen 10 is in a transparent state when in a display state; and any display screen 10 is in a dark state when in a non-display state.

[0035] The electronic paper display panel does not consume power when the image is still, and has excellent power-saving performance compared to other display products. The electronic paper display panel does not need a backlight at all, and uses ambient light to illuminate the electronic paper display panel, and then refracts the light into the viewer's eyes. It is the same as the visual principle of traditional paper or objects in life. The brighter the ambient light, the clearer the electronic paper display panel is, and it has a wide viewing angle of 170°.

[0036] like Figure 1 and Figure 3 As shown, the electronic paper display panel is a double-sided display panel, the first display module 4 is located on the side of the electronic ink layer 3 away from the base substrate 1, the second display module 5 is located on the side of the base substrate 1 away from the drive array layer 2, and the first display module 4 and the second display module 5 respectively include two display screens 10. When one side of the electronic paper display panel does not need to be displayed or the ambient light is sufficient, the two display screens 10 located on the same side can be displayed in a dark state, including black, blue or gray-black, etc., to prevent light from passing through the electronic ink layer 3, and when the other side needs to be displayed, the two display screens 10 located on the same side are displayed in a transparent state, thereby improving the display brightness of the electronic paper display panel.

[0037] like Figure 4 and Figure 5 As shown, one of the two display screens 10 on the same side is in a dark state, and the other is in a transparent state. The two display screens 10 on the same side can be driven independently without interfering with each other. This state can be applied to the electronic tags of shopping mall products, for example. Without moving the electronic tags, the double-sided dual-screen display can meet the needs of customers observing product information on the outside and staff observing product information on the inside. The product information is displayed at the same time to avoid the problem of information asymmetry. One electronic tag can meet the use requirements, and the cost is low.

[0038] It is understandable that the first display module 4 and the second display module 5 may further include more display screens 10, and each display screen 10 may be independently controlled to present a dark state or a transparent state, depending on the specific application scenario, which will not be elaborated herein.

[0039] In addition, the electronic paper display panel in the embodiment of the present application provides display information to the first display module 4 and the second display module 5 respectively through an electronic ink layer 3, so that the load of the driving array layer 2 driving the electronic ink layer 3 is smaller, which is beneficial to reducing the display defect rate problem of the electronic paper display panel and improving the display quality.

[0040] The electronic paper display panel provided in the embodiment of the present application includes a base substrate 1, a drive array layer 2 and an electronic ink layer 3 arranged in sequence, and a first display module 4 located on the side of the electronic ink layer 3 away from the base substrate 1 and a second display module 5 located on the side of the base substrate 1 away from the drive array layer 2. The first display module 4 and the second display module 5 respectively include at least two display screens 10, and any display screen 10 is in a transparent state when in a display state; any display screen 10 is in a dark state when in a non-display state. Therefore, the electronic paper display panel can meet the requirements of simultaneous double-sided display and single-sided display through multiple display screens 10, realize multi-scenario application requirements, and is convenient to use.

[0041] In some embodiments, the display screen 10 includes a first substrate 11 and a second substrate 12 that are relatively arranged, and a first transparent conductive layer 13, an ion storage layer 14, an electrolyte layer 15, an electrochromic layer 16, and a second transparent conductive layer 17 located between the first substrate 11 and the second substrate 12; at least two display screens 10 of the first display module 4 and at least two display screens 10 of the second display module 5 respectively cause an electrochemical oxidation-reduction reaction in their respective electrochromic layers 16 to cause a change in the chromaticity of the object to present different color states.

[0042] like Figure 2 As shown, the materials of the first substrate 11 and the second substrate 12 may be, for example but not limited to, glass, ceramic, quartz, sapphire, acrylic, polyimide, polyethylene terephthalate, other suitable materials or combinations thereof. The materials of the first transparent conductive layer 13 and the second transparent conductive layer 17 may include indium tin oxide, indium zinc oxide or other suitable conductive materials.

[0043] The ion storage layer 14, the electrolyte layer 15 and the electrochromic layer 16 are arranged as composite light-blocking materials between the first transparent conductive layer 13 and the second transparent conductive layer 17 to form a sandwich structure. When energized, the molecules or particles of the light-blocking material will be rearranged to achieve a light-blocking or light-transmitting effect, and the strength of the voltage or electric field determines the transmittance.

[0044] In this embodiment, the electrochromic layer 16 in the light-blocking material undergoes an electrochemical oxidation-reduction reaction under the action of an external electric field, causing the chromaticity of the object to change, so as to present different color states. The color change process is the decomposition and reduction process of the electrochromic material, realizing a stable and reversible change of reflectivity, absorptivity or transmittance, so that the display screen 10 can be adjusted from a transparent state to a dark state. The lower the operating voltage between the first transparent conductive layer 13 and the second transparent conductive layer 17, the lower the energy consumption, the stronger the heat insulation effect, and the power-off memory function. The display screen 10 can absorb 99% of visible light and 99.9% of ultraviolet light in the dark state, thereby improving the brightness of the electronic paper display panel.

[0045] Furthermore, the electrochromic layer 16 is an inorganic material or an organic material, wherein the inorganic material includes tungsten trioxide (WO3), molybdenum trioxide (MoO3), nickelous oxide (NiO), iridium dioxide (IrO2), and vanadium pentoxide (V2O5); and the organic material includes polyaniline. The above inorganic material or organic material can undergo an electrochemical redox reaction under the action of an external electric field to cause a change in the chromaticity of the object, thereby presenting different color states.

[0046] Furthermore, the electrolyte layer 15 includes lithium niobate (LiNbO 3 ), lithium aluminum oxide (LiAlO 2 ) and lithium tantalate (LiTaO), which are generally solid materials and are used to conduct corresponding counter ions when the electrochromic layer 16 undergoes an electrochemical redox reaction.

[0047] Further, in one example, the ion storage layer 14 is used to store corresponding counter ions when the electrochromic layer 16 undergoes an electrochemical redox reaction to maintain charge balance. In another example, the ion storage layer 14 is an electrochromic material having a color change property opposite to that of the electrochromic layer 16 .

[0048] Thus, the composite light-blocking material undergoes an electrochemical oxidation-reduction reaction through the electrochromic layer 16 to generate ions, the electrolyte layer 15 conducts the corresponding counter-ions, and the ion storage layer 14 stores the corresponding counter-ions to maintain charge balance, thereby achieving a stable and reversible change in reflectivity, absorptivity or transmittance, thereby making the display screen 10 present different color states.

[0049] In some embodiments, the electronic ink layer 3 includes a planarization layer 30 located on the driving array layer 2 and formed with multiple microcavity structures 31, microparticle capsules 32 filled in the microcavity structures 31, an electrode layer 33 covering the multiple microcavity structures 31, and a thin film encapsulation layer 34 covering the electrode layer 33. The driving array layer 2 includes multiple electrodes corresponding one-to-one to the multiple microcavity structures 31.

[0050] like Figure 1 , 3 As shown in Figures 5 to 5, the planarization layer 30 can make the surface of the driving array layer 2 flat, the planarization layer 30 is formed with a plurality of microcavity structures 31, the microcavity structures 31 are formed with microparticle capsules 32, the electrode layer 33 covers the plurality of microcavity structures 31, the driving array layer 2 includes a plurality of electrodes corresponding to the plurality of microcavity structures 31, and the electrode layer 33 is a common electrode. The thin film encapsulation layer 34 can ensure that the electronic ink layer 3 is protected from external moisture, impurities, etc., thereby improving reliability.

[0051] In this embodiment, the microparticle capsule 32 may include a capsule shell, a portion of a fluid, and a plurality of charged particles, wherein the capsule shell encapsulates a portion of the fluid, and the charged particles are dispersed in the fluid. The capsule shell may include, for example, a polymer material or other suitable material, the charged particles may include, for example, titanium dioxide or other suitable material, and the fluid may be, for example, a liquid, wherein the liquid may include, for example, ink but is not limited thereto.

[0052] Thus, the charged particles between the electrode of the driving array layer 2 and the common electrode of the electrode layer 33 are moved under the control of the voltage difference therebetween, and the charged particles reflect the light from the first display module 4 or the second display module 5, so that the display screen 10 presents different colors.

[0053] Furthermore, the microparticle capsules 32 include positive electrophoretic particles and negative electrophoretic particles which are stacked and have opposite polarities, and the electrophoretic particles in the corresponding membrane layers of the microparticle capsules 32 in two adjacent microcavity structures 31 have opposite polarities.

[0054] like Figure 1 , 3 As shown in 5, one of the positive electrophoretic particles and the negative electrophoretic particles is, for example, a white particle, and the other is, for example, a black particle, but not limited thereto. In this case, the fluid is transparent or black, but not limited thereto. The positive electrophoretic particles and the negative electrophoretic particles in the embodiment of the present application may also be other suitable colors according to actual needs. In addition, the positive electrophoretic particles and the negative electrophoretic particles may also be particles of the same color, and the colors of the positive electrophoretic particles and the negative electrophoretic particles may be different from the color of the fluid, for example, the positive electrophoretic particles and the negative electrophoretic particles are white, and the fluid is black.

[0055] Taking the case where the positive electrophoretic particles are black and the negative electrophoretic particles are white as an example, when the negative voltage applied to the electrode of the driving array layer 2 is lower than the voltage of the common electrode of the electrode layer 33 (e.g., the ground voltage), the positive electrophoretic particles will be attracted by the electrode and move toward the driving array layer 2, and the negative electrophoretic particles will be attracted by the common electrode and move toward the electrode layer 33. Thus, by controlling the magnitude of the voltage difference between the electrode and the common electrode or the length, number, or timing of applying the voltage difference, the number of black positive electrophoretic particles adjacent to the electrode and the number of white negative electrophoretic particles adjacent to the common electrode can be controlled to present different display grayscales. The light entering the display screen 10 of the first display module 4 or the second display module 5 is reflected by the black positive electrophoretic particles, so that the image displayed by the electronic paper display panel from the first display module 4 or the second display module 5 presents a dark state or a color close to a dark state. On the contrary, when the positive voltage applied to the electrode of the driving array layer 2 is higher than the voltage of the common electrode of the electrode layer 33 (e.g., the ground voltage), the image displayed by the electronic paper display panel from the first display module 4 or the second display module 5 can present a transparent state or a color close to a transparent state. The display screen 10 of the first display module 4 or the second display module 5 can display independent images, thereby improving the application field of the electronic paper display panel.

[0056] In some embodiments, the base substrate 1 is integrally formed with the first base 11 of the second display module 5 ; or, the thin film encapsulation layer 34 is integrally formed with the first base 11 of the first display module 4 .

[0057] like Figure 1 , 3As shown in FIG. 5 , the base substrate 1 is integrally formed with the first base 11 of the second display module 5, and the thin film encapsulation layer 34 is integrally formed with the first base 11 of the first display module 4, so that the electronic ink layer 3 can be integrally prepared with the drive array layer 2, the first display module 4 and the second display module 5, simplifying the manufacturing process. Compared with simply laminating two independent single-sided electronic paper display panels back to back, the electronic paper display panel in this embodiment is thinner, which is conducive to reducing material and manufacturing costs.

[0058] Second embodiment

[0059] like Figure 6 As shown, the second embodiment of the present application also provides an electronic paper display panel, which is Figures 1 to 5 The electronic paper display panel structure of the first embodiment shown is similar, except that the structure and working principle of the display screen 10 of the first display module 4 or the second display module 5 are different.

[0060] Specifically, the display screen 10 includes a first substrate 11 and a second substrate 12 that are relatively arranged, and a first transparent conductive layer 13, a first alignment film 18a, a liquid crystal layer 19, a second alignment film 18b, and a second transparent conductive layer 17 located between the first substrate 11 and the second substrate 12, the liquid crystal layer 19 includes a plurality of liquid crystal molecules, and the liquid crystal molecules contain dichroic dyes or high molecular polymers; at least two display screens 10 of the first display module 4 and at least two display screens 10 of the second display module 5 present different color states through the deflection angles of their respective liquid crystal molecules.

[0061] The first alignment film 18a and the second alignment film 18b are generally formed by adding a solvent to a resin material such as polyimide to reduce its viscosity, and have the characteristics of fluidity, high heat resistance, resistance to chemical solvents and radiation, and good electrical insulation properties. The first alignment film 18a and the second alignment film 18b are made by printing plate transfer (APR) and inkjet printing (Inkjet Printing).

[0062] In one example, the liquid crystal molecules contain high molecular polymers, and the deflection direction of the liquid crystal molecules is controlled by the electric field between the first transparent conductive layer 13 and the second transparent conductive layer 17, so that light passes through the gaps, thereby adjusting the light transmittance of the display screen 10. The display screen 10 can block about 36% of visible light and 99.5% of ultraviolet rays in the dark state, and realize brightness adjustment in both bright and dark states.

[0063] In another example, the liquid crystal molecules contain dichroic dyes, and in a normal state, the display screen 10 is grayish black and can absorb light; in a powered state, the voltage controls the deflection of the dye liquid crystal molecules, allowing light to pass through the dye liquid crystal layer 19. The display screen 10 has a high degree of opacity, which can better protect privacy.

[0064] Furthermore, the display screen 10 further includes a rubber frame 101 and a plurality of support columns 102 disposed between the first substrate 11 and the second substrate 12. The rubber frame 101 is disposed around the liquid crystal layer 19, and the plurality of support columns 102 are disposed at intervals in the liquid crystal layer 19. The rubber frame 101 is used to seal the liquid crystal layer 19 between the first substrate 11 and the second substrate 12, and the support columns 102 are used to support the first substrate 11 and the second substrate 12 to prevent the display screen 10 from being deformed by pressure.

[0065] The electronic paper display panel provided in the embodiment of the present application can meet the requirements of simultaneous double-sided display and single-sided display through multiple display screens 10, realize multi-scenario application requirements, and is easy to use.

[0066] It should be easily understood that “on,” “above,” and “over” in this application should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above something” or “over,” but also may include the meaning of “above something” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0067] The term "substrate substrate" as used herein refers to the material on which subsequent material layers are added. The substrate substrate itself can be patterned. The material added on top of the substrate substrate can be patterned, or can remain unpatterned. In addition, the substrate substrate can include a wide range of materials, such as silicon, germanium, gallium arsenide, indium phosphide, etc. Alternatively, the substrate substrate can be made of a non-conductive material (e.g., glass, plastic, or sapphire wafer, etc.).

[0068] The term "layer" as used herein may refer to a portion of a material including an area having a certain thickness. A layer may extend over the entire underlying structure or overlying structure, or may have a range smaller than the range of the underlying or overlying structure. In addition, a layer may be an area of ​​a homogeneous or non-homogeneous continuous structure, the thickness of which is less than the thickness of the continuous structure. For example, a layer may be located between the top surface and the bottom surface of the continuous structure or between any pairs of lateral planes at the top surface and the bottom surface. A layer may extend laterally, vertically and / or along a tapered surface. A drive array layer may be a layer, may include one or more layers therein, and / or may have one or more layers located thereon, above it and / or below it. A layer may include multiple layers. For example, an interconnect layer may include one or more conductors and contact layers (forming contacts, interconnect lines and / or vias therein) and one or more dielectric layers.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electronic paper display panel, comprising a base substrate, a drive array layer and an electronic ink layer arranged in sequence, and a first display module located on a side of the electronic ink layer away from the base substrate and a second display module located on a side of the base substrate away from the drive array layer, characterized in that: The first display module and the second display module respectively include at least two display screens, and any of the display screens is in a transparent state when in a display state; and any of the display screens is in a dark state when in a non-display state.

2. The electronic paper display panel according to claim 1, characterized in that: The display screen comprises a first substrate and a second substrate which are arranged opposite to each other, and a first transparent conductive layer, an ion storage layer, an electrolyte layer, an electrochromic layer, and a second transparent conductive layer which are located between the first substrate and the second substrate; The at least two display screens of the first display module and the at least two display screens of the second display module cause the chromaticity of the object to change through the electrochemical oxidation-reduction reaction of their respective electrochromic layers, so as to present different color states.

3. The electronic paper display panel according to claim 2, characterized in that: The electrochromic layer is made of inorganic material or organic material. The inorganic material includes tungsten trioxide, molybdenum trioxide, nickelous oxide, iridium dioxide, and vanadium pentoxide. The organic material includes polyaniline.

4. The electronic paper display panel according to claim 2, characterized in that: The electrolyte layer includes lithium niobate, lithium aluminum oxide and lithium tantalate, and is used for conducting corresponding counter ions when the electrochemical redox reaction occurs in the electrochromic layer.

5. The electronic paper display panel according to claim 2, characterized in that: The ion storage layer is used to store corresponding counter ions when the electrochromic layer undergoes an electrochemical oxidation-reduction reaction to maintain charge balance; alternatively, the ion storage layer is an electrochromic material having a color change property opposite to that of the electrochromic layer.

6. The electronic paper display panel according to claim 1, characterized in that: The display screen comprises a first substrate and a second substrate arranged opposite to each other, and a first transparent conductive layer, a first alignment film, a liquid crystal layer, a second alignment film, and a second transparent conductive layer located between the first substrate and the second substrate, wherein the liquid crystal layer comprises a plurality of liquid crystal molecules, and the liquid crystal molecules contain dichroic dyes or high molecular polymers; The at least two display screens of the first display module and the at least two display screens of the second display module present different color states through the deflection angles of their respective liquid crystal molecules.

7. The electronic paper display panel according to claim 6, characterized in that: The display screen further comprises a plastic frame and a plurality of supporting columns arranged between the first substrate and the second substrate, the plastic frame is arranged around the liquid crystal layer, and the plurality of supporting columns are arranged in the liquid crystal layer at intervals.

8. The electronic paper display panel according to claim 6, characterized in that: The electronic ink layer includes a planarization layer located on the driving array layer and formed with a plurality of microcavity structures, microparticle capsules filled in the microcavity structures, an electrode layer covering the plurality of microcavity structures, and a thin film encapsulation layer covering the electrode layer. The driving array layer includes a plurality of electrodes corresponding one-to-one to the plurality of microcavity structures.

9. The electronic paper display panel according to claim 8, characterized in that: The microparticle capsules include positive electrophoretic particles and negative electrophoretic particles that are stacked, and the polarities of the electrophoretic particles in the corresponding membrane layers of the microparticle capsules in two adjacent microcavity structures are opposite.

10. The electronic paper display panel according to claim 8, characterized in that: The base substrate is integrally formed with the first base of the second display module; or the thin film encapsulation layer is integrally formed with the first base of the first display module.

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