Novel electrophoretic display device for improving display effect after power failure

Abstract

The invention discloses a novel electrophoresis display device capable of improving display effect after power failure, which comprises a first transparent conductive substrate, an electrophoresis layer, a sealing layer and a second transparent conductive substrate which are sequentially stacked from bottom to top, a plurality of micro-cup structures are formed in the electrophoresis layer, the cross section of each micro-cup structure is in an inverted trapezoidal shape, and the first transparent conductive substrate and the second transparent conductive substrate are sequentially stacked from bottom to top. The light emitting surface of the inverted trapezoid is the long side of the inverted trapezoid, the bottom surface of the inverted trapezoid is the short side of the inverted trapezoid, the waist of the inverted trapezoid is a rough surface in the direction from the long side of the inverted trapezoid to the short side of the inverted trapezoid, and the waist of the inverted trapezoid is a smooth surface in the direction from the short side of the inverted trapezoid to the long side of the inverted trapezoid. When the electrophoretic particles fall due to gravity, the electrophoretic particles near the micro-cup wall are subjected to upward friction force after being in contact with the micro-cup wall, and the waists of the inverted trapezoid are rough surfaces in the direction from the long sides of the inverted trapezoid to the short sides of the inverted trapezoid, so that the upward friction force is increased, the downward gravity of the electrophoretic particles is completely balanced, and the electrophoretic particles are prevented from falling off. Therefore, electrophoretic particles are stabilized at the top of the electrophoretic display device, and the purpose of keeping the best display effect for a long time is achieved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically, to a novel electrophoretic display device that improves display performance after power failure. Background Technology

[0002] Electronic paper, with its advantages of bistable operation, low power consumption, and paper-like visual experience, has been widely used in electronic shelf labels, e-books, and smart wearables. Most existing electronic paper products use microcapsule or microcup structures, but the density of the electrophoretic particles within them is difficult to perfectly match the density of the electrophoretic liquid. Therefore, in conventional structures, the density of electrophoretic particles is usually greater than the density of the electrophoretic liquid. Consequently, after power is turned off, the electrophoretic particles slowly descend due to gravity, resulting in a deterioration in the display quality. Summary of the Invention

[0003] The technical problem to be solved by the present invention is how to prevent the electrophoretic particles from falling after the power is turned off, so that the electrophoretic particles remain stable at the top of the electrophoresis device for a long time, thereby achieving the purpose of maintaining the best display effect for a long time.

[0004] The technical problem to be solved by the present invention is achieved through the following technical solution: To solve the above-mentioned technical problems, the present invention provides a novel electrophoretic display device for improving the display effect after power failure. The device includes a first transparent conductive substrate, an electrophoretic layer, a sealing layer, and a second transparent conductive substrate, which are sequentially stacked from bottom to top. Multiple microcup structures are formed within the electrophoretic layer. The cross-sectional shape of each microcup structure is an inverted trapezoid. The light-emitting surface of the inverted trapezoid is its long side, and its base is its short side. The waist of the inverted trapezoid is a rough surface in the direction from its long side to its short side, and a smooth surface in the direction from its short side to its long side.

[0005] In a preferred embodiment of the novel electrophoretic display device for improving display effect after power failure provided by the present invention, the length of the long side of the inverted trapezoid is more than twice the length of the short side of the inverted trapezoid.

[0006] As a preferred embodiment of the novel electrophoretic display device for improving the display effect after power failure provided by the present invention, the electrophoretic layer is provided with multiple partition walls.

[0007] As a preferred embodiment of the novel electrophoretic display device for improving display effect after power failure provided by the present invention, the cross-sectional shape of the partition wall is a regular trapezoid, the light-emitting surface of the regular trapezoid is the short side of the regular trapezoid, and the base of the regular trapezoid is the long side of the regular trapezoid.

[0008] As a preferred embodiment of the novel electrophoretic display device for improving display effect after power failure provided by the present invention, multiple partition walls are arranged to form a square shape, and the area enclosed by the multiple partition walls forms the microcup structure.

[0009] As a preferred embodiment of the novel electrophoretic display device for improving display effect after power failure provided by the present invention, multiple partition walls enclose a regular hexagon, and the area enclosed by the multiple partition walls forms the microcup structure.

[0010] In a preferred embodiment of the novel electrophoretic display device for improving display effect after power failure provided by the present invention, the waist of the trapezoidal partition wall is a rough surface in the direction from the short side to the long side of the trapezoidal partition wall, and the waist of the trapezoidal partition wall is a smooth surface in the direction from the long side to the short side of the trapezoidal partition wall.

[0011] In a preferred embodiment of the novel electrophoretic display device for improving display effect after power failure provided by the present invention, the material of the partition wall is a dielectric material or an insulating material.

[0012] In a preferred embodiment of the novel electrophoretic display device for improving display effect after power failure provided by the present invention, the material of the partition wall is photoresist.

[0013] In a preferred embodiment of the novel electrophoretic display device for improving display effect after power failure provided by the present invention, the material of the partition wall is positive photoresist or negative photoresist.

[0014] The present invention has the following beneficial effects: Because the cross-sectional shape of the microcup structure is an inverted trapezoid, with the light-emitting surface of the inverted trapezoid being its long side and the base being its short side, when the electrophoretic particles fall due to gravity, the particles near the microcup wall experience an upward frictional force after contacting the wall. Furthermore, since the waist of the inverted trapezoid is rough along the direction from its long side to its short side, and smooth along the direction from its short side to its long side, this increases the upward frictional force, completely balancing the downward gravity on the electrophoretic particles. This allows the electrophoretic particles to remain stable at the top of the electrophoretic display device, achieving the goal of maintaining optimal display performance over a long period. Attached Figure Description

[0015] To more clearly illustrate the solutions in this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a novel electrophoretic display device that improves the display effect after power failure, as provided by the present invention.

[0017] Figure 2 for Figure 1 A schematic diagram of the microcup structure.

[0018] Figure 3 for Figure 1 A schematic diagram of the intermediate partition wall.

[0019] Explanation of icon numbers: First transparent conductive substrate 1; electrophoretic layer 2; sealing layer 3; second transparent conductive substrate 4; microcup structure 21; long side 211 of inverted trapezoid; short side 212 of inverted trapezoid; waist 213 of inverted trapezoid; partition wall 22; short side 221 of regular trapezoid; long side 222 of regular trapezoid; waist 223 of regular trapezoid. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] This invention provides a novel electrophoretic display device for improving display performance after power failure. It includes a first transparent conductive substrate, an electrophoretic layer, a sealing layer, and a second transparent conductive substrate, which are sequentially stacked from bottom to top. Multiple microcup structures are formed within the electrophoretic layer. The cross-sectional shape of each microcup structure is an inverted trapezoid. The light-emitting surface of the inverted trapezoid is its long side, and the base surface is its short side. The waist of the inverted trapezoid is a rough surface in the direction from its long side to its short side, and a smooth surface in the direction from its short side to its long side.

[0024] Because the cross-sectional shape of the microcup structure is an inverted trapezoid, with the light-emitting surface of the inverted trapezoid being its long side and the base being its short side, when the electrophoretic particles fall due to gravity, the particles near the microcup wall experience an upward frictional force after contacting the wall. Furthermore, since the waist of the inverted trapezoid is rough along the direction from its long side to its short side, and smooth along the direction from its short side to its long side, this increases the upward frictional force, completely balancing the downward gravity on the electrophoretic particles. This allows the electrophoretic particles to remain stable at the top of the electrophoretic display device, achieving the goal of maintaining optimal display performance over a long period.

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. The present invention will be described in detail below with reference to the accompanying drawings and embodiments, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] Example 1, please refer to Figure 1 and Figure 2The present invention provides a novel electrophoretic display device for improving display effect after power failure, comprising a first transparent conductive substrate 1, an electrophoretic layer 2, a sealing layer 3, and a second transparent conductive substrate 4, which are sequentially stacked from bottom to top. A plurality of microcup structures 21 are formed in the electrophoretic layer 2. The cross-sectional shape of the microcup structure 21 is an inverted trapezoid. The light-emitting surface of the inverted trapezoid is the long side 211 of the inverted trapezoid, the bottom surface of the inverted trapezoid is the short side 212 of the inverted trapezoid, the waist 213 of the inverted trapezoid is a rough surface in the direction from the long side 211 to the short side 212 of the inverted trapezoid, and the waist 213 of the inverted trapezoid is a smooth surface in the direction from the short side 212 to the long side 211 of the inverted trapezoid. Since the cross-sectional shape of the microcup structure 21 is an inverted trapezoid, that is, the light-emitting surface of the inverted trapezoid is the long side 211 and the base is the short side 212, when the electrophoretic particles fall due to gravity, the electrophoretic particles near the microcup wall are subjected to an upward frictional force after contacting the microcup wall. In addition, since the waist 213 of the inverted trapezoid is a rough surface in the direction from the long side 211 to the short side 212, it increases the upward frictional force, which completely balances the downward gravity of the electrophoretic particles. This makes the electrophoretic particles stable at the top of the electrophoretic display device, achieving the purpose of maintaining the best display effect for a long time.

[0027] The waist 213 of the inverted trapezoid is a smooth surface in the direction from the short side 212 of the inverted trapezoid to the long side 211 of the inverted trapezoid, so that it can rise normally when it is electrically driven.

[0028] Furthermore, the length of the long side 211 of the inverted trapezoid is more than twice the length of the short side 212 of the inverted trapezoid, so as to increase the slope of the waist 213 of the inverted trapezoid, reduce the influence of gravity, and ensure that it can completely balance the downward gravity of the electrophoretic particles, thereby stabilizing the electrophoretic particles at the top of the electrophoretic display device and achieving the purpose of maintaining the best display effect for a long time.

[0029] Example 2, please refer to Figure 3 As a further optimization of Embodiment 1, in this embodiment, multiple partition walls 22 are provided within the electrophoretic layer 2. The cross-sectional shape of the partition wall 22 is a regular trapezoid. The light-emitting surface of the regular trapezoid is the short side 221, and the base surface is the long side 222. The waist 223 of the regular trapezoid of the partition wall 22 is a rough surface in the direction from the short side 221 to the long side 222, and the waist 223 of the regular trapezoid of the partition wall 22 is a smooth surface in the direction from the long side 222 to the short side 221. The partition walls 22 form an inverted trapezoidal shape of the microcup structure 21, and the waist 213 of the inverted trapezoid is a rough surface in the direction from the long side 211 to the short side 212, and the waist 213 of the inverted trapezoid is a smooth surface in the direction from the short side 212 to the long side 211.

[0030] Furthermore, multiple partition walls 22 enclose a square or hexagonal shape, and the area enclosed by the multiple partition walls 22 forms the microcup structure 21.

[0031] Furthermore, the material of the partition wall 22 is a dielectric material or an insulating material. In this embodiment, the material of the partition wall 22 is photoresist, specifically, the material of the partition wall 22 is positive photoresist or negative photoresist.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A novel electrophoretic display device for improving display performance after power failure, characterized in that, It includes a first transparent conductive substrate, an electrophoretic layer, a sealing layer, and a second transparent conductive substrate, which are stacked sequentially from bottom to top. Multiple microcup structures are formed in the electrophoretic layer. The cross-sectional shape of the microcup structure is an inverted trapezoid. The light-emitting surface of the inverted trapezoid is the long side of the inverted trapezoid, the base surface of the inverted trapezoid is the short side of the inverted trapezoid, the waist of the inverted trapezoid is a rough surface in the direction from the long side to the short side of the inverted trapezoid, and the waist of the inverted trapezoid is a smooth surface in the direction from the short side to the long side of the inverted trapezoid.

2. The novel electrophoretic display device for improving display effect after power failure according to claim 1, characterized in that, The length of the longer side of the inverted trapezoid is more than twice the length of the shorter side.

3. The novel electrophoretic display device for improving display effect after power failure according to claim 1, characterized in that, The electrophoretic layer is equipped with multiple partition walls.

4. The novel electrophoretic display device for improving display effect after power failure according to claim 3, characterized in that, The partition wall has a cross-sectional shape of a regular trapezoid, with the light-emitting surface of the trapezoid being the shorter side and the base being the longer side.

5. The novel electrophoretic display device for improving display effect after power failure according to claim 4, characterized in that, Multiple partition walls enclose a square shape, and the area enclosed by these partition walls forms the microcup structure.

6. The novel electrophoretic display device for improving display effect after power failure according to claim 4, characterized in that, Multiple partition walls enclose a regular hexagon, and the area enclosed by the multiple partition walls forms the microcup structure.

7. The novel electrophoretic display device for improving display effect after power failure according to claim 4, characterized in that, The waist of the trapezoidal partition wall is a rough surface in the direction from the short side to the long side of the trapezoidal, and the waist of the trapezoidal partition wall is a smooth surface in the direction from the long side to the short side of the trapezoidal.

8. The novel electrophoretic display device for improving display effect after power failure according to claim 1, characterized in that, The partition wall is made of dielectric or insulating material.

9. The novel electrophoretic display device for improving display effect after power failure according to claim 8, characterized in that, The partition wall is made of photoresist.

10. The novel electrophoretic display device for improving display effect after power failure according to claim 1, characterized in that, The partition wall is made of positive photoresist or negative photoresist.

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