Electrowetting display

Abstract

The invention discloses an electrowetting display, and relates to the technical field of display devices. The lower supporting plate is provided with a supporting face, the first electrode is arranged on the supporting face, and the hydrophobic insulating layer covers the side, away from the supporting face, of the first electrode. The pixel wall is arranged on the side, away from the first electrode, of the hydrophobic insulating layer, a plurality of pixel grids are defined by the pixel wall, each pixel grid comprises at least two sub-pixel grids, and an opening is formed in the pixel wall so that all the sub-pixel grids can be communicated. An opening is formed in the pixel wall so that all the sub-pixel grids can be communicated with one another. When part of the sub-pixel grids in a single pixel grid are switched from a closed state to an open state under the action of an electric field, the non-polar liquid in the sub-pixel grids in the open state can be transferred into the sub-pixel grids in the closed state through the openings. The non-polar liquid in the sub-pixel grids in the open state is less, so that the aperture opening ratio of the corresponding pixel grids can be increased, and the color gamut of the electrowetting display is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of display devices, and more particularly to an electrowetting display. Background Art

[0002] EWD (Electrowetting display) technology changes the electro-driven wettability of a liquid on a dielectric hydrophobic material, causing the droplet to spread or contract. After integrating into a display, it can produce a perceptible optical change, featuring fast response time, low voltage, and low power consumption.

[0003] In related technologies, when the electrode is energized, there is an opaque non-polar liquid in each sub-pixel cell in the pixel cell, and the aperture ratio of the sub-pixel cell is relatively low, resulting in insufficient color gamut of the display device. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides an electrowetting display that can increase the aperture ratio of the sub-pixel cell and the color gamut of the display device.

[0005] An electrowetting display according to an embodiment of the first aspect of the present invention includes: A lower substrate, including a lower support plate, a first electrode, and a hydrophobic insulating layer. The lower support plate has a support surface, the first electrode is disposed on the support surface, and the hydrophobic insulating layer covers a side of the first electrode facing away from the support surface; A plurality of pixel walls are disposed on a side of the hydrophobic insulating layer facing away from the first electrode. The pixel walls define a plurality of pixel cells, and each pixel cell includes at least two sub-pixel cells. The pixel walls are formed with openings to communicate the sub-pixel cells within the pixel cell with each other.

[0006] The electrowetting display according to an embodiment of the present invention has at least the following beneficial effects: In the solution of the embodiment of the present application, the electro-wetting display includes a plurality of pixel walls. The pixel walls define a plurality of pixel cells. Each pixel cell includes at least two sub-pixel cells. The pixel walls are formed with openings to communicate all the sub-pixel cells with each other. When some sub-pixel cells within a single pixel cell are switched from the off state to the on state under the action of an electric field, the non-polar liquid within the sub-pixel cells in the on state can transfer through the openings to the sub-pixel cells in the off state. The decrease in the non-polar liquid within the sub-pixel cells in the on state can increase the aperture ratio of the corresponding pixel cell, thereby increasing the color gamut and brightness of the electro-wetting display. Furthermore, when all the sub-pixel cells within a single pixel cell are switched from the off state to the on state, the non-polar liquid within the sub-pixel cells can converge within one of the sub-pixel cells, and the non-polar liquid overlaps in the thickness direction of the lower substrate, so that the overall aperture ratio of the pixel cell is relatively large and the brightness of the pixel cell is relatively high.

[0007] According to some embodiments of the present invention, the number of the sub-pixel cells corresponding to a single pixel cell is four.

[0008] According to some embodiments of the present invention, the pixel wall includes a first wall body and a second wall body arranged orthogonally to each other. The number of both the first wall body and the second wall body is multiple. Along the length direction of the first wall body, the ratio of the distance between two adjacent first wall bodies to the length of the first wall body is a preset ratio, and the range of the preset ratio is from 0.05 to 0.1.

[0009] According to some embodiments of the present invention, the pixel wall includes a first wall body and a second wall body arranged orthogonally to each other. The number of both the first wall body and the second wall body is multiple. Along the length direction of the first wall body, the distance between two adjacent first wall bodies is a first distance. Along the length direction of the second wall body, the distance between two adjacent second wall bodies is a second distance. The first distance is equal to the second distance.

[0010] According to some embodiments of the present invention, the pixel wall includes a first wall body and a second wall body arranged orthogonally to each other. The number of both the first wall body and the second wall body is multiple. Both ends of the first wall body along the length direction of the first wall body are formed with openings, and / or both ends of the second wall body along the length direction of the second wall body are formed with openings.

[0011] According to some embodiments of the present invention, when projected along the thickness direction of the lower substrate, the shape of the projection area of the pixel cell is a square.

[0012] According to some embodiments of the present invention, the lower substrate further includes a package connected to the pixel wall. The package surrounds the circumference of the pixel wall and extends along the thickness direction of the lower substrate.

[0013] According to some embodiments of the present invention, the electrowetting display further includes: A non-polar liquid, which is contained in each pixel cell when the electrowetting display is in the off state; A polar liquid, which is contained in each pixel cell; An upper substrate, covering the lower substrate, and in the projection along the thickness direction of the electrowetting display, the projection area of the upper substrate covers the projection area of the pixel wall to close the pixel cell.

[0014] According to some embodiments of the present invention, the upper substrate includes a second electrode, and the second electrode is indium tin oxide conductive glass.

[0015] According to some embodiments of the present invention, the upper substrate includes a filter, and the filter includes a plurality of filter regions, at least one of the filter regions is red, at least one of the filter regions is green, at least one of the filter regions is blue, and at least one of the filter regions is transparent.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0017] The present invention will be further described below with reference to the drawings and embodiments, where: Figure 1 is a schematic structural diagram of an electrowetting display according to an embodiment of the present application, and the sub-pixel cells corresponding to a single pixel cell in the figure are all in the off state; Figure 2 is a side view of the structure of an electrowetting display according to an embodiment of the present application; Figure 3 is a schematic structural diagram of an electrowetting display according to an embodiment of the present application, and one of the sub-pixel cells corresponding to a single pixel cell in the figure is in the on state; Figure 4 is a schematic structural diagram of an electrowetting display according to an embodiment of the present application, and the four sub-pixel cells corresponding to a single pixel cell in the figure are all in the on state.

[0018] Reference Signs: 100. Lower substrate; 110. Lower support plate; 110a. Support surface; 120. First electrode; 130. Hydrophobic insulating layer; 140. Pixel wall; 140a. Pixel cell; 140b. Sub-pixel cell; 140c. Opening; 141. First wall; 142. Second wall; 143. Third wall; 150. Encapsulation; 200. Non-polar liquid; 300. Polar liquid; 400. Upper substrate; 410. Second electrode; 420. Filter; 430. Upper support plate. Detailed implementation manners

[0019] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and thus are only examples and should not be used to limit the protection scope of the present application.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and the above drawings of this application are intended to cover non-exclusive inclusion.

[0021] In the description of the embodiments of this application, technical terms such as "first", "second", and "third" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is two or more, unless otherwise specifically and clearly defined.

[0022] Referring to "embodiments" herein means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0023] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0024] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "top", "bottom", "upper", and "lower" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description. They do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated, or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0025] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0026] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0027] In the related art, the electrowetting display is provided with a pixel wall to define a plurality of pixel grids, the pixel grid includes a plurality of sub-pixel grids, and the pixel wall isolates the plurality of sub-pixel grids from each other. When the sub-pixel grid is switched from a closed state to an open state under the action of an electric field, the polar liquid squeezes the non-polar liquid, causing the non-polar liquid to gather at the edge or corner of the corresponding sub-pixel grid. Due to the limiting effect of the pixel wall, each sub-pixel grid in the open state has a non-polar liquid, resulting in a low aperture ratio of the sub-pixel grid, so that the color gamut and brightness of the pixel grid are affected by the non-polar liquid and reduced.

[0028] In the embodiment of the present application, the pixel wall 140 is formed with an opening 140c to connect the sub-pixel grids 140b to each other. When the sub-pixel grid 140b is switched from a closed state to an open state, the non-polar liquid 200 can move from the pixel wall 140 of the corresponding sub-pixel grid 140b to the sub-pixel grid 140b in the closed state, thereby increasing the aperture ratio of the sub-pixel grid 140b in the open state and increasing the color gamut and brightness of the electrowetting display.

[0029] It can be understood that in an electrowetting display, a plurality of pixel cells 140a are defined by a pixel wall 140. Each pixel cell 140a contains a polar liquid 300 and a non-polar liquid 200. The non-polar liquid 200 is usually an ink. An external electric field can be used to control the surface tension of the polar liquid 300 within a single pixel cell 140a. When no voltage is applied, the non-polar liquid 200 spreads within the pixel cell 140a. When a voltage is applied to the liquid within the pixel cell 140a starting from the state where no voltage is applied, the oil film formed by the spreading of the non-polar liquid 200 breaks, and then the non-polar liquid 200 moves to the corners of the pixel cell 140a, causing the pixel cell 140a to change from the off state to the on state.

[0030] A first aspect of the present application provides an electrowetting display. Please refer to Figure 1 and Figure 2 , the electrowetting display includes a lower substrate 100 and a plurality of pixel walls 140. The lower substrate 100 includes a lower support plate 110, a first electrode 120, and a hydrophobic insulating layer 130. The lower support plate 110 has a support surface 110a. The first electrode 120 is disposed on the support surface 110a. The hydrophobic insulating layer 130 covers the side of the first electrode 120 facing away from the support surface 110a. A plurality of pixel walls 140 are disposed on the side of the hydrophobic insulating layer 130 facing away from the first electrode 120. The pixel wall 140 defines a plurality of pixel cells 140a. The pixel cell 140a includes at least two sub-pixel cells 140b. The pixel wall 140 is formed with an opening 140c to communicate the sub-pixel cells 140b within the pixel cell 140a with each other. Exemplarily, the lower support plate 110 is a glass plate.

[0031] It can be understood that the openings 140c formed by the first wall 141 and the second wall 142 corresponding to a single sub-pixel cell 140b communicate with each other, thereby forming a channel to enable the non-polar liquid 200 to flow through the channel into the sub-pixel cell 140b in the off state.

[0032] It can be understood that the openings 140c communicating the sub-pixel cells 140b within the pixel cell 140a means that the sub-pixel cells 140b within a single pixel cell 140a communicate with each other, or all the sub-pixel cells 140b communicate with each other.

[0033] A pixel cell 140a refers to the smallest unit on a display device that can independently display a color. The resolution of a display device is usually measured by the number of pixel cells 140a. For example, a display device with a resolution of 1920*1080 means that the display device has 1920 pixel cells 140a in the horizontal direction and 1080 pixel cells 140a in the vertical direction.

[0034] A sub-pixel cell 140b refers to the smallest unit that constitutes a single pixel cell 140a. The color displayed by the sub-pixel cell 140b is usually constant.

[0035] In the solution of the embodiment of the present application, the pixel wall 140 is formed with an opening 140c to communicate all the sub-pixel cells 140b with each other. When some of the sub-pixel cells 140b in a single pixel cell 140a are switched from the off state to the on state under the action of an electric field, the non-polar liquid 200 in the sub-pixel cells 140b in the on state can transfer through the opening 140c to the sub-pixel cells 140b in the off state. The less non-polar liquid 200 in the sub-pixel cells 140b in the on state can increase the aperture ratio of the corresponding pixel cell 140a, thereby increasing the color gamut and brightness of the electro-wetting display. Furthermore, when all the sub-pixel cells 140b in a single pixel cell 140a are switched from the off state to the on state, the non-polar liquid 200 in the sub-pixel cells 140b can gather in one of the sub-pixel cells 140b, and the non-polar liquids 200 are stacked in the thickness direction of the lower substrate 100, so that the overall aperture ratio of the pixel cell 140a is larger and the brightness of the pixel cell 140a is higher.

[0036] Exemplarily, the thickness direction is as Figure 2 the direction indicated by the arrow R3 in

[0037] In one embodiment, please refer to Figure 1 , the number of sub-pixel cells 140b corresponding to a single pixel cell 140a is four. The number of sub-pixel cells 140b being multiple can correspond to multiple sub-pixels of different colors, thereby enriching the colors of the electro-wetting display. Exemplarily, the number of sub-pixel cells 140b corresponding to a single pixel cell 140a is four, and the four sub-pixel cells 140b respectively correspond to a red sub-pixel, a blue sub-pixel, a green sub-pixel, and a transparent sub-pixel. The transparent sub-pixel can increase the reflectivity of the corresponding pixel cell 140a, thereby increasing the brightness. The combination of the red sub-pixel, the blue sub-pixel, and the green sub-pixel can make the corresponding pixel cell 140a reflect light of different colors to enrich the colors of the display device.

[0038] It can be understood that the embodiment of the present application does not limit the number of sub-pixel cells 140b corresponding to a single pixel cell 140a. Exemplarily, the number of sub-pixel cells 140b corresponding to a single pixel cell 140a is three, and the three sub-pixel cells 140b respectively correspond to a red sub-pixel, a blue sub-pixel, and a green sub-pixel.

[0039] In one embodiment, please refer to Figure 3, the pixel wall 140 includes a first wall 141 and a second wall 142 arranged orthogonally to each other, and the number of both the first wall 141 and the second wall 142 is multiple. The length direction of the first wall 141 is the first direction, the length direction of the second wall 142 is the second direction, and the first direction and the second direction are arranged orthogonally. Two adjacent second walls 142 along the first direction and two adjacent first walls 141 along the second direction jointly enclose a sub-pixel cell 140b. Along the length direction of the first wall 141, the ratio of the distance between two adjacent first walls 141 to the length of the first wall 141 is a preset ratio, and the range of the preset ratio is from 0.05 to 0.1. The preset ratio within a suitable range can control the size of the opening 140c of the pixel wall 140, so that the pixel wall 140 can play a certain adsorption role on the non-polar liquid 200 and then guide the movement of the non-polar liquid 200, and can also make the non-polar liquid 200 move more smoothly from the opening 140c to the sub-pixel cell 140b in the closed state, improving the response speed.

[0040] Exemplarily, the first direction is as Figure 1 shown by the arrow R1 in Figure 1 , and the second direction is as

[0041] shown by the arrow R2 in Figure 3 . Along the length direction of the first wall 141, the length direction of the first wall 141 is as Figure 3 shown by the dimension D3 in

[0042] , and the distance between two adjacent first walls 141 is as

[0043] shown by the dimension D1 in Figure 3 . Exemplarily, the pixel wall 140 further includes a third wall 143, and the third wall 143 surrounds the circumferences of all the pixel cells 140a, and the third wall 143 is connected to the outermost first wall 141 and second wall 142. The third wall 143 can reduce the leakage amount of the polar liquid 300 and the non-polar liquid 200 to a certain extent.

[0044] Exemplarily, the first distance is as Figure 3As shown by the medium dimension D1, the second distance is as Figure 3 shown by the medium dimension D2.

[0045] In one embodiment, please refer to Figure 4 , openings 140c are formed at both ends of the first wall 141 along the length direction of the first wall 141, and / or, openings 140c are formed at both ends of the second wall 142 along the length direction of the second wall 142. Openings 140c are formed at both ends of the first wall 141 along the first direction and at both ends of the second wall 142 along the second direction. The non-polar liquid 200 can move from the sub-pixel cell 140b in the open state towards the adjacent sub-pixel cell 140b through the multiple openings 140c, so that the movement efficiency of the non-polar liquid 200 can be increased, and the response speed of the electro-wetting display can be increased.

[0046] It can be understood that the embodiments of the present application do not limit that openings 140c are formed at both ends of the first wall 141 along the length of the first wall 141, and openings 140c are formed at both ends of the second wall 142 along the length direction of the first wall 141. Exemplarily, an opening 140c is formed at one end of the first wall 141 along the length direction of the first wall 141, and an opening 140c is formed at one end of the second wall 142 along the length direction of the second wall 142.

[0047] In one embodiment, please refer to Figure 1 , when projected along the thickness direction of the lower substrate 100, the shape of the projection area of the pixel cell 140a is a square. The square pixel cell 140a has good uniformity, and the pixel cell 140a is symmetric in the horizontal and vertical directions, which is convenient for image processing and display. Moreover, the resolution of the square pixel cell 140a in the horizontal and vertical directions is known, and the degree of distortion of the image ratio is relatively low. Exemplarily, when projected along the thickness direction of the lower substrate 100, the shape of the projection area of a single sub-pixel cell 140b is a square.

[0048] It can be understood that the shape of the pixel cell 140a is not limited in other embodiments of the present application. Exemplarily, when projected along the thickness direction of the lower substrate 100, the shape of the projection area of the pixel cell 140a is a rectangle, a hexagon or a circle.

[0049] In one embodiment, please refer to Figure 1 and Figure 2, the lower substrate 100 further includes a package 150 connected to the pixel wall 140. The package 150 surrounds the circumferential direction of the pixel wall 140 and extends along the thickness direction of the lower substrate 100. Exemplarily, the material of the package 150 is encapsulation glue. The package 150 can accommodate all the pixel cells 140a therein, thereby realizing the encapsulation of all the pixel cells 140a. The package 150 can further increase the sealing degree of the pixel cells 140a and reduce the leakage of the polar liquid 300 and the non-polar liquid 200.

[0050] An embodiment of the present application further provides an electro-wetting display. Please refer to Figure 1 and Figure 2 , the electro-wetting display further includes a non-polar liquid 200, a polar liquid 300, and an upper substrate 400. The material of the non-polar liquid 200 can be ink, and the material of the polar liquid 300 can be water. When the electro-wetting display is in the off state, each pixel cell 140a contains the non-polar liquid 200. Each pixel cell 140a contains the polar liquid 300. The upper substrate 400 covers the lower substrate 100. Projected along the thickness direction of the electro-wetting display, the projected area of the upper substrate 400 covers the projected area of the pixel wall 140 to close the pixel cells 140a. The upper substrate 400 and the lower substrate 100 can serve as the support structure of the electro-wetting display. When the upper substrate 400 covers the lower substrate 100, both ends of the pixel wall 140 along the thickness direction of the lower substrate 100 are in contact with the upper substrate 400 and the lower substrate 100 respectively.

[0051] In one embodiment, please refer to Figure 2 , the upper substrate 400 includes a second electrode 410, and the second electrode 410 is indium tin oxide conductive glass. When the upper substrate 400 covers the lower substrate 100, the second electrode 410 is located on the side facing the pixel wall 140. An electric field can be generated by the first electrode 120 and the second electrode 410 to act on the hydrophobic insulating layer 130, thereby changing the hydrophilicity of the hydrophobic insulating layer 130 and controlling the movement of the non-polar liquid 200. Indium tin oxide conductive glass has good conductivity and transparency and can be well adapted to the display device. Exemplarily, the material of the second electrode 410 is a transparent material, and light can pass through the second electrode 410 more smoothly, and the second electrode 410 has less influence on the brightness of the electro-wetting display.

[0052] In one embodiment, please refer to Figure 2, the upper substrate 400 includes a color filter 420. The color filter 420 includes a plurality of color filter regions. The color of at least one color filter region is red, the color of at least one color filter region is green, the color of at least one color filter region is blue, and the color of at least one color filter region is transparent. The color filter regions are respectively three color filter regions with colors and one transparent color filter region. Through the three color filter regions with colors, the corresponding pixel cells 140a can present a variety of different colors, and the transparent color filter region can increase the brightness of the corresponding pixel cells 140a.

[0053] In one embodiment, please refer to Figure 2 , the upper substrate 400 further includes an upper support plate 430. The upper support plate 430 is respectively attached to the color filter 420 and the second electrode 410. The upper support plate 430 is located between the color filter 420 and the second electrode 410 along the thickness direction of the electro-wetting display. The upper support plate 430 can support the second electrode 410 and the color filter 420, increase the strength of the upper substrate 400, and thus increase the service life of the electro-wetting display. Exemplarily, the upper support plate 430 is a glass plate.

[0054] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the protection scope.

Claims

1. An electrowetting display, characterized in that, Comprising: A lower substrate, including a lower support plate, a first electrode, and a hydrophobic insulating layer. The lower support plate has a support surface, the first electrode is disposed on the support surface, and the hydrophobic insulating layer covers a side of the first electrode facing away from the support surface; A plurality of pixel walls, disposed on a side of the hydrophobic insulating layer facing away from the first electrode. The pixel walls define a plurality of pixel cells, and each pixel cell includes at least two sub-pixel cells. The pixel walls are formed with openings to communicate the sub-pixel cells within the pixel cell with each other.

2. The electrowetting display according to claim 1, wherein The number of sub-pixel cells corresponding to a single pixel cell is four.

3. The electrowetting display according to claim 1, wherein The pixel walls include a first wall body and a second wall body arranged orthogonally to each other. The number of the first wall body and the second wall body is plural. Along the length direction of the first wall body, the ratio of the distance between two adjacent first wall bodies to the length of the first wall body is a preset ratio, and the range of the preset ratio is from 0.05 to 0.

1.

4. The electrowetting display according to claim 1, wherein The pixel walls include a first wall body and a second wall body arranged orthogonally to each other. The number of the first wall body and the second wall body is plural. Along the length direction of the first wall body, the distance between two adjacent first wall bodies is a first distance, and along the length direction of the second wall body, the distance between two adjacent second wall bodies is a second distance, and the first distance is equal to the second distance.

5. The electro-wetting display according to claim 1, wherein The pixel walls include a first wall body and a second wall body arranged orthogonally to each other. The number of the first wall body and the second wall body is plural. Both ends of the first wall body along the length direction of the first wall body are formed with openings, and / or both ends of the second wall body along the length direction of the second wall body are formed with openings.

6. The electrowetting display according to any one of claims 1 to 5, characterized in that, When projected along the thickness direction of the lower substrate, the shape of the projection area of the pixel cell is a square.

7. The electrowetting display according to any one of claims 1 to 5, characterized in that, The lower substrate further includes a package connected to the pixel walls. The package surrounds the circumference of the pixel walls and extends along the thickness direction of the lower substrate.

8. The electrowetting display according to any one of claims 1 to 5, characterized in that, The electrowetting display further includes: A non-polar liquid, which is contained in each pixel cell when the electrowetting display is in a closed state; A polar liquid, which is contained in each pixel cell; an upper substrate, covering the lower substrate. When projected along the thickness direction of the electrowetting display, the projection area of the upper substrate covers the projection area of the pixel walls to close the pixel cells.

9. The electrowetting display according to claim 8, wherein, The upper substrate includes a second electrode, and the second electrode is indium tin oxide conductive glass.

10. The electrowetting display according to claim 8, wherein The upper substrate includes a filter, and the filter includes a plurality of filter regions. At least one filter region is red, at least one filter region is green, at least one filter region is blue, and at least one filter region is transparent.

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