CN118151457A - Electronic paper display panel and electronic paper display device - Google Patents

Abstract

The present disclosure provides an electronic paper display panel and an electronic paper display device, the electronic paper display panel includes a first substrate, a second substrate, and a plurality of electrophoresis units located between the first substrate and the second substrate, the electrophoresis units including a plurality of black electrophoresis particles; a plurality of pixel electrode layers are arranged on one side of the first substrate, which is close to the second substrate, and the orthographic projection of each pixel electrode layer on the first substrate covers the orthographic projection of an electrophoresis unit on the first substrate; the second substrate comprises a second substrate and a common electrode layer positioned on one side of the second substrate close to the first substrate, wherein a plurality of reflecting units which are in one-to-one correspondence with the plurality of electrophoresis units are further arranged between the first substrate and the pixel electrode layer, and the surface of the reflecting unit on one side close to the second substrate is a concave surface. By arranging the concave reflecting units which are in one-to-one correspondence with the electrophoresis units, the reflectivity of the electronic paper display panel is improved, the specular reflection phenomenon is broken, and the brightness uniformity of the display panel is improved.

Description

Electronic paper display panel and electronic paper display device

Technical Field

The present disclosure relates to the field of display technology. And more particularly, to an electronic paper display panel and an electronic paper display device.

Background

The electronic paper display panel is also called an electronic ink screen, is a novel display device, has a display effect close to a natural paper effect, can reduce visual fatigue during reading, is deeply favored by users due to the excellent characteristic that the low power consumption of the electronic paper display panel does not hurt eyes, but is limited by the reflectivity characteristic of electrophoresis particles of the ink screen, and the white state reflectivity of the traditional ink screen is far lower than that of white paper and does not meet the brightness requirement of human eyes.

Disclosure of Invention

The disclosure provides an electronic paper display panel and an electronic paper display device, which are used for solving the problem that the white state reflectivity of electronic paper in the related technology is lower than that of white paper and cannot meet the brightness requirement of human eyes.

In order to achieve the above purpose, the present disclosure adopts the following technical scheme:

A first aspect of the present disclosure provides an electronic paper display panel,

The liquid crystal display device comprises a first substrate, a second substrate and a plurality of electrophoresis units, wherein the first substrate, the second substrate and the electrophoresis units are oppositely arranged, and the electrophoresis units comprise a plurality of black electrophoresis particles;

a plurality of pixel electrode layers are arranged on one side of the first substrate, which is close to the second substrate, and the orthographic projection of each pixel electrode layer on the first substrate covers the orthographic projection of an electrophoresis unit on the first substrate;

A common electrode layer is arranged on one side of the second substrate, which is close to the first substrate;

The pixel electrode layer is arranged on the first substrate, the front projection of each concave reflecting unit on the first substrate covers the front projection of an electrophoresis unit on the first substrate, and the surface of the concave reflecting unit, which is close to one side of the second substrate, is a concave surface.

The electrophoresis unit of the electronic paper display panel in the electronic paper display panel only contains black electrophoresis particles, so that the response speed of the electronic paper display panel is improved, the reflectivity of the electronic paper display panel is improved by arranging the concave reflecting units corresponding to the electrophoresis units one by one, the influence of the specular reflection phenomenon of the electronic paper display panel with a plane reflecting structure in the related technology is broken, the brightness uniformity and the uniform luminosity of the display panel are improved, and the visual experience of a user is improved.

In one possible implementation manner, the concave reflecting unit is designed such that an incident point with an incident angle β and an exit angle 0 ° is a design position point, and the design position point is an arc midpoint between a center point of the concave reflecting unit and a highest point of the concave reflecting unit corresponding to the incident point;

the concave camber h of the concave reflecting unit is determined by:

Wherein Pitch represents the width of a single electrophoresis unit, h represents the camber of a concave reflecting unit, and beta represents the incident angle of light rays which are incident on the reflecting unit from outside to the electronic paper display panel, wherein the angle of the light rays is more than or equal to 20 degrees and less than or equal to 35 degrees.

According to the application, the camber of the reflecting unit is limited, so that the electronic paper display panel with the concave reflecting structure breaks the mirror reflection effect of the electronic paper display panel with the plane reflecting structure, the reflectivity of the device is improved, the uniformity of the reflection angle spectrum in the visual angle reaches more than 80%, the identifiable range of human eyes is exceeded, and the visual experience of a user is enhanced.

In a possible implementation, the electrophoretic cell includes a central region and an edge region surrounding the central region, and the black electrophoretic particles are configured to move under the driving of the pixel electrode and the common electrode to gather at the edge region of the electrophoretic cell in the first display state.

In one possible implementation, the black electrophoretic particles are configured to move to collect at the common electrode under the driving of the pixel electrode and the common electrode in the second display state.

In one possible implementation manner, the concave reflecting unit includes a concave structure and a reflecting layer formed on a surface of the concave structure near one side of the second substrate.

In one possible implementation, the material of the reflective layer includes metallic silver, metallic aluminum, and metallic copper.

In one possible implementation, the thickness of the reflective layer is 80nm or more and 120nm or less.

The material of the limiting reflecting layer of the implementation mode is silver, aluminum and copper, so that the reflectivity of the concave reflecting unit is ensured.

In one possible implementation manner, the electronic paper display panel further includes a dielectric film stack disposed on a side of the concave reflective unit near the second substrate.

In the embodiment, the dielectric film lamination is arranged on one side of the concave surface reflecting unit, which is close to the second substrate, so that the color display of the electronic paper display panel is realized without reducing the light energy.

In one possible implementation manner, the pixel electrode layer includes a plurality of sub-electrodes arranged at intervals, and the sub-electrodes are strip-shaped electrodes.

In one possible implementation manner, the electronic paper display panel further includes a pixel retaining wall disposed between two adjacent electrophoresis units, and the material of the pixel retaining wall is an organic glue material.

A second aspect of the present disclosure provides an electronic paper display device, including the electronic paper display panel provided in the first aspect of the present disclosure.

The beneficial effects of the present disclosure are as follows:

The electrophoresis unit of the electronic paper display panel provided by the disclosure only contains black electrophoresis particles, so that the response speed of the electronic paper display panel is improved, and the reflectivity of the electronic paper display panel is improved by arranging the concave reflecting units corresponding to the electrophoresis units one by one, so that the influence of the specular reflection phenomenon of the electronic paper display panel with a plane reflecting structure in the related technology is broken, the brightness uniformity and the uniform luminosity of the display panel are improved, and the visual experience of a user is improved.

Drawings

The following describes in further detail the specific embodiments of the present disclosure with reference to the drawings.

Fig. 1 is a schematic cross-sectional view showing an electronic paper display panel according to the related art.

Fig. 2 is a schematic cross-sectional view of an electronic paper display panel with a planar reflective structure according to the present disclosure.

Fig. 3 is a schematic view illustrating an optical path of the electronic paper display panel of fig. 2 of the present disclosure.

Fig. 4 is a schematic partial cross-sectional view of an electronic paper display panel according to an embodiment of the disclosure.

Fig. 5 is a schematic cross-sectional view of a single pixel of an electronic paper display panel according to an embodiment of the disclosure.

Fig. 6 is a schematic cross-sectional view of a single pixel of an electronic paper display panel according to an embodiment of the disclosure.

Fig. 7 shows a schematic optical path diagram of a reflection unit according to an embodiment of the disclosure.

Fig. 8 is a schematic view of an optical path of an electronic paper display panel in a second display state according to an embodiment of the disclosure.

Fig. 9 shows an incident angle-emergent angle spectrum plot of a reflection unit provided by an embodiment of the present disclosure.

Fig. 10 shows a doming-reflectivity plot for a reflective element provided by an entity in accordance with the present disclosure.

Detailed Description

The terms "on … …", "formed on … …" and "disposed on … …" in this disclosure may mean that one layer is formed directly on or disposed on another layer, or that one layer is formed indirectly on or disposed on another layer, i.e., that other layers are present between the two layers.

It should be noted that although the terms "first," "second," etc. may be used herein to describe various elements, components, elements, regions, layers and/or sections, these elements, components, elements, regions, layers and/or sections should not be limited by these terms. Rather, these terms are used to distinguish one component, member, element, region, layer and/or section from another. Thus, for example, a first component, a first member, a first element, a first region, a first layer, and/or a first portion discussed below may be referred to as a second component, a second member, a second element, a second region, a second layer, and/or a second portion without departing from the teachings of the present disclosure.

In this disclosure, unless otherwise indicated, the term "co-layer disposed" is used to mean that two layers, components, members, elements, or portions may be formed by the same manufacturing process (e.g., patterning process, etc.), and that the two layers, components, members, elements, or portions are generally formed of the same material. For example, the two or more functional layers are arranged in the same layer, meaning that the functional layers arranged in the same layer may be formed using the same material layer and the same manufacturing process, so that the manufacturing process of the display substrate may be simplified.

In the present disclosure, unless otherwise indicated, the expression "patterning process" generally includes the steps of coating of photoresist, exposure, development, etching, stripping of photoresist, and the like. The expression "one patterning process" means a process of forming a patterned layer, feature, component, etc. using a single mask.

As shown in fig. 1, the electronic paper display panel in the related art includes an array substrate and a cover plate which are disposed opposite to each other, and a pixel defining portion between the array substrate and the cover plate, the pixel defining portion defines a plurality of pixel units, the pixel units include an electronic ink layer between the array substrate and the cover plate, the electronic ink layer includes an electrophoretic liquid, a plurality of black charged particles 106, and a plurality of white charged particles 107, wherein polarities of the black charged particles and the white charged particles are different, for example, the black charged particles are positively charged, the white charged particles are floating, the array substrate includes a first substrate 105, a driving circuit layer 104, and a pixel electrode 103, the cover plate includes a second substrate 101 and a common electrode 102, the black charged particles 106 and the charged particles 107 are driven to move by controlling the pixel electrode 103 and the common electrode 102, and when the pixel units are in a white state, the white charged particles 107 are controlled to move to the side of the pixel electrode 103, so that the color of human eyes is white after the pixel units reflect ambient light; when the pixel unit is in the black state, the black charged particles 106 are controlled to move to the common electrode 102 side, and the white charged particles 107 are controlled to move to the pixel electrode 103 side.

However, the inventor finds that when the black-white two-state switching is performed in this way, the particles of the two colors collide, so that the response time of the electronic paper display panel is longer, and in addition, due to the reflectivity characteristic of the white charged particles, the reflectivity of the electronic paper display panel to ambient light in the white state is lower, and the brightness required by human eyes cannot be met.

Therefore, the inventor proposes that only black charged particles in the electronic ink layer are reserved, and a layer of reflection unit is newly added on the array substrate, so as to obtain the electronic paper display panel shown in fig. 2, wherein the electronic paper display panel comprises an array substrate and a cover plate which are oppositely arranged, and the electronic ink layer between the two, and the array substrate comprises a third substrate 207, a driving circuit layer 206, a reflection unit 205 and a pixel electrode 204 which are stacked; the cover plate includes a fourth substrate 201 and a common electrode 202; the electronic ink layer includes an electrophoretic fluid and a plurality of charged black particles 203. In the black state, the black charged particles 203 are tiled in the side of the common electrode 202 of the pixel structure to realize the black state, in the white state, the black charged particles 203 are pulled to the two sides of the pixel unit transversely, and concentrated to the upper parts of the sub-pixel electrodes on the two sides, namely the region Q in FIG. 3, so that the reflection unit and the pixel electrode are exposed to realize the reflection of ambient light, and the color seen by human eyes after the pixel unit reflects the ambient light is white.

However, the inventor also found that, for the single-particle reflective electronic paper, due to lack of particle scattering, a stronger specular reflection effect is shown in a white state, although the reflectivity is improved, the visibility and the visual experience are poor, meanwhile, considering that the use scene of the single-particle reflective electronic paper is generally indoor, and the indoor light is taken as a reflection light source thereof and is generally arranged in the vicinity of the obliquely upper 30 DEG of a viewer.

Based on the above consideration, the first embodiment of the disclosure proposes an electronic paper display panel, as shown in fig. 4 and 5, including a first substrate 40, a second substrate 50, and a plurality of electrophoresis units 60 disposed opposite to each other and between the first substrate 40 and the second substrate 50, wherein the electrophoresis units include a plurality of black electrophoresis particles 6011;

The first substrate 40 includes a first substrate 401 and a plurality of pixel electrode layers located on one side of the first substrate 401 near the second substrate, wherein the front projection of each pixel electrode layer on the first substrate 40 covers the front projection (not shown in the figure) of an electrophoresis unit 60 on the first substrate 40;

the second substrate 50 includes a second substrate 501, and a common electrode layer 502 on a side of the second substrate 501 adjacent to the first substrate 40, wherein,

The first substrate 401 is further provided with a reflective layer on a side close to the pixel electrode layer, the reflective layer includes a plurality of concave reflection units 402 corresponding to the electrophoresis units one by one, and the outer surface of the concave reflection unit 402 on a side close to the second substrate 501 is a concave surface to form a concave mirror.

In the embodiment, the electrophoresis unit of the electronic paper display panel only contains black electrophoresis particles, so that the response speed of the electronic paper display panel is improved, and the reflectivity of the electronic paper display panel is improved by arranging the concave reflecting units corresponding to the electrophoresis units one by one, so that the influence of the specular reflection phenomenon of the electronic paper display panel with the plane reflecting structure is broken, the brightness uniformity and the uniform luminosity of the display panel are improved, and the visual experience of a user is improved.

In one possible implementation, the black electrophoretic particles 6011 are configured to move to be gathered on the common electrode 502 side by the driving of the pixel electrode and the common electrode 502 in the second display state, as shown in fig. 5.

Specifically, the second display state is that the pixel unit presents a full black state, at this time, the pixel electrode and the common electrode 502 are controlled to drive the black electrophoretic particles 6011 to gather on the side of the common electrode 502 and to be evenly distributed, at this time, the black electrophoretic particles 6011 absorb the ambient light, so that the pixel unit displays black.

In the implementation mode, the full black state is realized through the monochromatic electrophoretic particles, so that the reaction speed of the electronic paper display panel is improved, and the response time of the electronic paper display panel is shortened.

In one possible implementation, the electrophoretic cell 60 includes a central region and an edge region surrounding the central region, and the black electrophoretic particles 6011 are configured to move under the driving of the pixel electrode and the common electrode 502 to gather at the edge region of the electrophoretic cell 60 in the first display state.

Specifically, in the first display state, the pixel unit is in a full white state, at this time, the pixel electrode and the common electrode 502 are controlled to drive the black electrophoretic particles 6011 to gather in the edge area of the electrophoretic unit 60, as shown in fig. 6, and in the first display state, the concave reflection unit 402 reflects the ambient light, so that the pixel unit displays white.

In the implementation mode, the full white state is realized through the monochromatic electrophoretic particles, so that the reaction speed of the electronic paper display panel is improved, and the response time of the electronic paper display panel is shortened.

In one possible implementation, the incident point of the first light ray is a design position point located at a midpoint of an arc between the center of the curved surface of the concave reflection unit 402 and the highest point of the edge of the concave reflection unit 402 corresponding to the incident point, that is, a quarter point of the curved surface arc passing through the center point of the curved surface and the incident point of the first light ray, wherein,

The highest point of the edge of the concave reflecting unit corresponding to the incident point represents the highest point on the extension line of the central point on the surface of the concave reflecting unit to the direction of the incident point.

An incident angle of the first light beam incident on the concave reflection unit 402 is 0 °;

The camber h of the concave reflective unit 402 is calculated by:

Where Pitch denotes the width of the single electrophoretic element 60, h denotes the camber of the concave reflective element 402, and β denotes the incident angle at which light incident on the concave reflective element 402 from the outside is incident on the light incident surface of the electronic paper display panel at an angle of 20 ° or more and 35 ° or less.

FIG. 7 is a schematic view of a simple optical path of a concave mirror, wherein a normal line of a lowest point O of a bottom surface is perpendicular to a horizontal plane, and a light ray entering the point at 30 degrees is emitted from a direction of-30 degrees; light entering the point A at 30 degrees is reflected by the cambered surface and exits from the direction of 0 degrees; the point C is the highest point of the edge corresponding to the point A, and in the process that the incident point moves from the point O to the point A on the arc OA, the emergent direction of 30 DEG incident to the concave reflector deviates from-30 DEG to 0 DEG; the exit direction of the 30 ° incident on the concave mirror on the arc AC is shifted from 0 ° to 30 °.

Wherein the included angle between the incident light and the vertical direction, namely the incident angle is beta, the included angle between the normal line at the incident point A and the vertical direction is alpha, the emergent light is along the vertical direction, according to the law of reflection, the included angle between the incident light at the point A and the vertical direction is equal to the included angle between the emergent light at the point A and the vertical direction,Available according to geometric relationship,/>

The light rays at the left and right sides of the incident point A are deflected to the left and right sides in the 0-degree direction respectively and gradually deflected to 30 degrees, in order to ensure that the brightness of the left and right sides is uniform, the point A is required to be satisfied as the midpoint of an arc OC, the included angle between the connecting line FC of the focal point F of the curved surface and the point C and the vertical direction is θ, according to the geometric relationship, the θ=β=2α, and then the focal length requirement of the curved surface reflector can be calculated by the following formula:

where Pitch denotes the width of the single electrophoretic cell 60, β denotes the incident angle of the external light rays incident on the concave reflective cell 402, and f denotes the focal length of the concave reflective cell.

The inventor considers that the lamp is generally located near 30 degrees above the user, and therefore, in order to facilitate the user's viewing, the reflection rate and the exit angle spectrum of the incident light ray about 30 degrees are emphasized by simulating different concave mirrors, and the camber h of the concave reflecting unit 402, β represents the incident angle of the incident light ray about 30 degrees from the outside into the concave reflecting unit 402.

Taking the high-end product of electronic paper on the market as an example, we analyze the benefit effect brought by the concave structure. Taking a high-end product as an example, the resolution is 300PPI, the corresponding pixel opening is 85-100 μm, in order to form a sealed box, considering that a black pixel isolation wall with the width of 5 μm is designed around each pixel, the real opening interval is 75-90 μm, taking the real pixel opening width as 75 μm as an example, in order to break the specular reflection and realize the uniform brightness in the view angle, according to the theoretical calculation, the focal length of the concave reflection unit 402 needs to be about 106.95 μm, and the arch height h of the concave reflection unit 402 is about 6.79 μm.

Based on the theoretical calculation, taking the incidence of a 30-degree light source as an example, the inventor adopts simulation software to analyze the reflection effect of the concave structure, and simulates the light emergent angle spectrum of the 30-degree light source of a pixel unit with the pixel opening width of 75 μm, as shown in fig. 9, the simulation result shows that when the camber of the concave mirror is 1 μm, the reflection effect is similar to plane reflection, and when the camber is 5-7 μm, the light emergent brightness of the 30-degree light source is basically equal to the light emergent brightness of the front view angle, the specular reflection effect is broken, and the light homogenizing property is improved.

The inventor obtains through many times of simulation verification, and the effect of breaking the mirror reflection effect and improving the light uniformity can be achieved by adjusting the external light of 20-35 degrees.

In one possible implementation, the focal length of each point on the concave reflective layer is the same.

Further, considering that the black electrophoretic particles 6011 need to be pulled to two sides of the pixel unit when the single particle reflective electronic paper display panel is in a white state, the aperture ratio is affected, the inventor introduces the existence of the black electrophoretic particles 6011 into the device structure to further analyze the benefit brought by the concave structure, as shown in fig. 3, the existence of the black electrophoretic particles 6011 of the electronic paper display panel shown in fig. 2 causes shielding on the light path, so that the usable area of the plane reflection unit 402 is further reduced, the light efficiency is lost, and the concave reflection unit has a certain convergence effect, so that the light absorbed by the black electrophoretic particles 6011 originally gathered on two sides is emitted, and the light efficiency is improved, specifically referring to fig. 8.

Based on the above analysis, the inventors performed a simulation analysis on the effect of the reflectivity gain of the structure, and obtained the result shown in fig. 10, wherein, the concave mirror camber of 0 represents the reflectivity of the pixel unit of the single-particle planar reflective structure, the gain is 151% compared with the reflectivity of the electronic paper product in the related art, the reflectivity of the pixel unit of the single-particle concave reflective structure increases with the increase of the camber, the highest point is reached when the camber reaches 5 μm, the device reflectivity reaches 68%, the product gain reaches 112% compared with the planar reflective structure, and the product gain reaches 170% compared with the product gain in the related art.

In summary, the electronic paper display panel with the concave reflecting structure breaks the mirror reflection effect of the electronic paper display panel with the planar reflecting structure, improves the reflectivity of the device, ensures that the uniformity of the reflection angle spectrum in the visual angle of a user reaches more than 80%, exceeds the identifiable range of human eyes, and enhances the visual experience of the user.

In one possible implementation, the concave reflecting unit 402 includes a concave structure and a reflecting layer formed on a side surface of the concave structure near the second substrate.

Specifically, the material of the reflective layer includes metallic silver, metallic aluminum, and metallic copper.

Specifically, an organic gel material is coated on the first substrate 401, a concave shape is formed through an etching process to obtain a concave structure, and then a layer of reflective material is deposited on the concave structure through a sputtering process to form a reflective layer.

Specifically, the reflective material is, for example, one or more of metallic silver, metallic aluminum, and metallic copper.

In one possible implementation, the thickness of the deposited reflective material is 80nm or greater and 120nm or less.

In particular, the thickness of the reflective material is, for example, 85nm, 90nm, 95nm, 100nm, 110nm or 115nm, and can be defined by a person skilled in the art according to the specific circumstances.

Specifically, the camber h of the concave reflective unit 402 is calculated by:

h＝f(1-cosβ)

Where f denotes a focal length of the concave reflecting unit, pitch denotes a width of the single electrophoretic unit 60, h denotes an arch height of the concave reflecting unit 402, and β denotes an incident angle at which light of 20 ° or more and 35 ° or less from the outside is incident on the concave reflecting unit 402.

In consideration of that the formation of the pixel electrode on the surface with poor flatness may cause the thickness of the pixel electrode to be different in different areas, and then breakage may easily occur, in a specific example, the electronic paper display panel further includes a first planarization layer 405 covering each concave reflection unit 402, and the front projection of the first planarization layer 405 on the first substrate 401 covers the front projection of the electrophoresis unit 60 on the first substrate 401.

For example, the first planarization layer 405 is formed by laying transparent polymers such as polymethyl methacrylate (PMMA), polycarbonate (PC), polyvinyl alcohol (PVA), etc. on the side of the concave reflection unit 402 away from the first substrate 401.

The planarization layer is formed above the concave reflection unit 402 in the implementation manner, so that the preparation of a subsequent structure is facilitated, the pixel electrode is prevented from being broken, and the product quality is improved.

In one possible implementation, the pixel electrode material is deposited and patterned on the side of the first planarization layer 405 remote from the first substrate 401.

For example, the pixel electrode material is a metal oxide having high transparency such as indium tin oxide, zinc oxide, or tin dioxide.

In one possible implementation, the electronic paper display panel further includes a driving circuit layer 404 disposed on a side of the first substrate 401 near the concave reflective unit 402.

In one possible implementation, to realize color display, the surface of the concave reflective unit 402 near the side of the second substrate is provided with a dielectric film stack.

Specifically, the dielectric film stack includes at least one first dielectric film layer and at least one second dielectric film layer, and the refractive index of the first dielectric film layer is higher than that of the second dielectric film layer.

The dielectric film lamination is a film system formed by stacking multiple layers of high-low refractive index materials, and the high reflectivity of specific colors is realized by designing the refractive index and the thickness of each dielectric film layer.

In the embodiment, the dielectric film lamination is arranged on one side of the concave surface reflecting unit, which is close to the second substrate, so that the color display of the electronic paper display panel is realized without reducing the light energy.

In one possible implementation, the dielectric film stacks include a first color dielectric film stack, a second color dielectric film stack and a third color dielectric film stack, for example, the first color dielectric film stack, the second color dielectric film stack and the third color dielectric film stack are respectively disposed on the light emergent side of the electronic paper of the concave reflection unit 402 corresponding to the adjacent three electrophoresis units 60, and the first color dielectric film stack layer is, for example, a red dielectric film stack and has high reflectivity for light with a wavelength of 600nm-770 nm; the second color dielectric film lamination is, for example, a green dielectric film lamination, and has high reflectivity for light rays with the wavelength of 500nm-580 nm; the third color dielectric film stack is, for example, a blue dielectric film stack, and has a high reflectance for light of 400nm to 500 nm.

In consideration of that the formation of the pixel electrode on the surface with poor flatness may cause the thickness of the pixel electrode to be different in different areas, and then breakage may easily occur, in a specific example, the electronic paper display panel further includes a second planarization layer covering the dielectric film stack, the second planarization layer covering the surface of the dielectric film stack on the side close to the second substrate 501, and the orthographic projection of the second planarization layer on the first substrate 401 covers the orthographic projection of the electrophoresis unit 60 on the first substrate 401.

For example, the second planarizing layer is formed by laying a transparent polymer such as polymethyl methacrylate (PMMA), polycarbonate (PC), polyvinyl alcohol (PVA), or the like on the side of the dielectric film stack away from the first substrate 401.

The planarization layer is formed above the dielectric film lamination layer, so that the preparation of a subsequent structure is facilitated, the pixel electrode is prevented from being broken, and the product quality is improved.

In one possible implementation, the pixel electrode material is deposited and patterned to form a pixel electrode layer on a side of the second planarization layer remote from the first substrate 401.

For example, the pixel electrode material is a metal oxide having high transparency such as indium tin oxide, zinc oxide, or tin dioxide.

In a possible implementation, in order to implement a color display, the surface of the concave reflective unit 402 near the side of the second substrate is provided with a color blocking layer, and the orthographic projection of the color blocking layer on the first substrate 401 covers the orthographic projection of the concave reflective unit 402 on the first substrate 401.

Specifically, the color resistance layer comprises a first color resistance layer, a second color resistance layer and a third color resistance layer. For example, the first color resist layer is a red color resist layer, the second color resist layer is a green color resist layer, and the third color resist layer is a blue color resist layer.

Specifically, the concave reflecting units 402 corresponding to the adjacent three electrophoresis units 60 are respectively provided with a first color resist layer, a second color resist layer and a third color resist layer on a side close to the second substrate.

Based on the structure of the above-described implementation, in one specific example, color display is realized by controlling the brightness of each color sub-pixel and the distribution of the black electrophoretic particles 6011 in the electrophoretic cell 60 corresponding to each sub-pixel.

In consideration of that the formation of the pixel electrode on the surface with poor flatness may cause the thickness of the pixel electrode to be different in different areas, and then the breakage may easily occur, in a specific example, the electronic paper display panel further includes a third planarization layer covering the color resist layer, the third planarization layer covering the surface of the dielectric film stack on the side close to the second substrate 501, and the orthographic projection of the third planarization layer on the first substrate 401 covering the orthographic projection of the electrophoresis unit 60 on the first substrate 401.

For example, the third planarization layer is formed by laying transparent polymers such as polymethyl methacrylate (PMMA), polycarbonate (PC), polyvinyl alcohol (PVA), etc. on the side of the concave reflection unit 402 away from the first substrate 401.

According to the realization mode, the planarization layer is formed above the color resistance layer, so that the preparation of a subsequent structure is facilitated, the pixel electrode is prevented from being broken, and the product quality is improved.

In one possible implementation, the pixel electrode material is deposited and patterned on the side of the third planarization layer remote from the first substrate 401 to form a pixel electrode layer.

For example, the pixel electrode material is a metal oxide having high transparency such as indium tin oxide, zinc oxide, or tin dioxide.

In one possible implementation manner, the pixel electrode layer includes a plurality of sub-electrodes arranged at intervals, and the sub-electrodes are strip-shaped electrodes.

The material of the pixel electrode is, for example, a metal oxide having high transparency such as indium tin oxide, zinc oxide, or tin dioxide.

As shown in fig. 6, in a specific example, a single pixel unit defined by the pixel barrier 70 includes a plurality of stripe-shaped sub-pixel electrodes disposed on the first substrate 401, the electrophoretic unit 60 is disposed between the plurality of stripe-shaped pixel electrodes and the common electrode 502, wherein the common electrode 502 disposed at one side of the second substrate 501 near the pixel electrode serves as a first electrode, the black electrophoretic particles 6011 of the electrophoretic unit 60 have, for example, a negative polarity, and a voltage applied to both sides of the first electrode is 0V, and the black electrophoretic particles 6011 of the electrophoretic unit 60 absorb ambient light incident from the outside by applying a negative voltage to the stripe-shaped sub-pixel electrodes 411, 412, 413, and 414, so that the black electrophoretic particles 6011 gather at the common electrode 502, thereby realizing a second display state of the pixel unit; by applying a positive voltage to the strip-shaped sub-pixel electrodes 411 and 414, the black electrophoretic particles 6011 of the electrophoretic unit 60 are collected on the strip-shaped sub-pixel electrodes 411 and 414, and the concave reflection unit 402 located between the strip-shaped sub-pixel electrodes 411 and 414 can reflect ambient light, so that the first display state of the pixel unit is realized.

It should be noted that the edges of both sides of the pixel electrode layer of the electrophoretic element 60 near the first substrate side of each sub-pixel are provided with sub-pixel electrodes to collect the black electrophoretic particles 6011 of the electrophoretic element 60 at the edge region of the electrophoretic element 60, realizing the first display state.

In one possible implementation manner, the first electrode layer serving as the common electrode 502 is laid on one side of the second substrate 501, the whole surface of the common electrode 502 covers the electronic paper display panel, and the material of the common electrode 502 is a metal oxide with high transparency, such as indium tin oxide, zinc oxide, tin dioxide, and the like.

Another embodiment of the present disclosure provides a driving method for driving the electronic paper display panel provided in the foregoing embodiment, including:

according to the acquired display data, a driving voltage is applied to the pixel electrode layer such that:

The black electrophoretic particles 6011 in at least one of the electrophoretic cells 60 move to be accumulated in the common electrode 502, realizing that the electrophoretic cell 60 is in the second display state; or (b)

The black electrophoretic particles 6011 in at least one of the electrophoretic cells 60 move to be accumulated in the edge region of the electrophoretic cell 60, realizing that the electrophoretic cell 60 is in the first display state.

Another embodiment of the present disclosure provides an electronic paper display device, including the electronic paper display panel provided in the foregoing embodiment. The electronic paper display device may be any product or component with a display function, such as an electronic reader, a billboard, an electronic tag, etc., which is not limited in this embodiment.

It should be apparent that the foregoing examples of the present disclosure are merely illustrative of the present disclosure and not limiting of the embodiments of the present disclosure, and that various other changes and modifications may be made by one of ordinary skill in the art based on the foregoing description, and it is not intended to be exhaustive of all embodiments, and all obvious changes and modifications that come within the scope of the present disclosure are intended to be embraced by the technical solution of the present disclosure.

Claims (11)

1. An electronic paper display panel is characterized by comprising a first substrate, a second substrate and a plurality of electrophoresis units, wherein the first substrate, the second substrate and the electrophoresis units are arranged oppositely, and the electrophoresis units comprise a plurality of black electrophoresis particles;

a plurality of pixel electrode layers are arranged on one side of the first substrate, which is close to the second substrate, and the orthographic projection of each pixel electrode layer on the first substrate covers the orthographic projection of an electrophoresis unit on the first substrate;

A common electrode layer is arranged on one side of the second substrate, which is close to the first substrate;

The pixel electrode layer is arranged on the first substrate, the front projection of each concave reflecting unit on the first substrate covers the front projection of an electrophoresis unit on the first substrate, and the surface of the concave reflecting unit, which is close to one side of the second substrate, is a concave surface.

2. The electronic paper display panel of claim 1, wherein,

The concave reflecting unit is designed to be an incidence point with an incidence angle beta and an emergence angle of 0 DEG as a design position point, and the design position point is an arc midpoint between the center point of the concave reflecting unit and the highest point of the concave reflecting unit corresponding to the incidence point;

The concave camber ^h of the concave reflecting unit is determined by the following formula:

Wherein ^Pitch denotes the width of a single electrophoresis unit, h denotes the camber of a concave reflection unit, and β denotes the angle at which light rays having an external angle of 20 ° or more and 35 ° or less, which are incident on the electronic paper display panel, are incident on the concave reflection unit.

3. The electronic paper display panel of claim 1, wherein,

The electrophoretic cell includes a central region and an edge region surrounding the central region, and the black electrophoretic particles are configured to move to be accumulated in the edge region of the electrophoretic cell under the driving of the pixel electrode layer and the common electrode layer in a first display state.

4. The electronic paper display panel of claim 1, wherein,

The black electrophoretic particles are configured to move to be gathered at one side of the common electrode layer under the driving of the pixel electrode layer and the common electrode layer in a second display state.

5. The electronic paper display panel of claim 1, wherein,

The concave reflecting unit comprises a concave structure and a reflecting layer formed on one side surface of the concave structure, which is close to the second substrate.

6. The electronic paper display panel of claim 5, wherein,

The material of the reflecting layer comprises silver, aluminum or copper.

7. The electronic paper display panel of claim 5, wherein,

The thickness of the reflection layer is 80nm or more and 120nm or less.

8. The electronic paper display panel of claim 1, wherein,

The electronic paper display panel further comprises a dielectric film lamination layer arranged on one side, close to the second substrate, of the concave reflection unit.

9. The electronic paper display panel of claim 1, wherein,

The pixel electrode layer comprises a plurality of sub-electrodes which are arranged at intervals, and the sub-electrodes are strip-shaped electrodes.

10. The electronic paper display panel of claim 1, wherein,

The electronic paper display panel further comprises pixel retaining walls arranged between two adjacent electrophoresis units, and the pixel retaining walls are made of organic materials.

11. An electronic paper display device comprising the electronic paper display panel according to any one of claims 1 to 10.