Common-cavity type color electrowetting display device and preparation method thereof

Abstract

The invention discloses a common cavity type color electrowetting display device and a preparation method thereof, the electrowetting display device comprises a first supporting assembly and a second supporting assembly, and a sealing cavity is formed between the two supporting assemblies; the two supporting assemblies each comprise a conductive substrate, a hydrophobic insulating layer and a pixel wall which are sequentially arranged in the direction towards the other supporting assembly, and the pixel walls surround pixel grids. The sealing cavity is filled with conductive polar liquid and non-polar liquid which are mutually insoluble, the non-polar liquid comprises two kinds of non-polar liquid with different colors, and the pixel grids of the two supporting assemblies are filled with the two kinds of non-polar liquid respectively; the conductive polar liquid is electrically connected with the conductive substrates of the two supporting assemblies. By means of the structural arrangement, the device substrate structure can be simplified, and different-color common-cavity display is achieved; the distance between the non-polar liquids of the color developing layers with different colors can be thinned and shortened, and the inherent stereoscopic vision and cross color problems of the stacked display device are relieved; meanwhile, the number of light transmission interfaces can be reduced, and the lighting effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrowetting, and in particular to a common cavity color electrowetting display device and a preparation method thereof. Background Art

[0002] Electronic paper is a new type of reflective display technology that relies on reflecting ambient light for display. Since it does not emit light, the contradiction between brightness and color gamut has always been a challenge that has plagued the colorization of electronic paper. Using stacked reflective display devices is one of the main ways to achieve colorization of electronic paper. Its basic principle is the subtractive color mixing principle. For example, CMY three-color devices are stacked vertically, and by controlling the change in the ink opening rate of each layer of display device, the proportion of incident and reflected light absorbed by each color ink is controlled, thereby achieving various color displays. The structure of traditional display devices is as follows: Figure 1 As shown, it is specifically composed of three independent monochrome display elements stacked directly. Each independent monochrome display element is composed of two upper and lower glass substrates and a sealed cavity formed by the two substrates, which is filled with two immiscible non-polar liquids 6 and polar liquids 7. The monochrome display element includes a support plate 1, a conductive ITO film layer 2, a dielectric layer (not shown in the figure), a hydrophobic insulating layer 3, a pixel wall 4 and a sealing frame 5. The three independent monochrome display elements are stacked together to form a complete full-color electro-lubricating display device with 6 substrates. However, for a 6-layer substrate stacked vertical color mixing device, due to the increased distance between the color film layers (the distance between the color film layers is much larger than the pixel size), it is difficult to avoid display visual problems such as cross-color and stereoscopic vision; at the same time, due to the interface reflection, refraction, visible light absorption, etc. caused by the numerous film layers, a large amount of light efficiency loss and visual image will be caused, causing the reflectivity and color gamut of the device to attenuate, making it difficult to achieve the device design indicators of high brightness and wide color gamut that should be possessed based on the subtractive color mixing principle. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a common cavity color electrowetting display device and a method for preparing the same.

[0004] In a first aspect of the present invention, a common cavity color electrowetting display device is provided, comprising:

[0005] a first supporting assembly and a second supporting assembly, wherein a first sealed cavity is formed between the first supporting assembly and the second supporting assembly;

[0006] The first supporting assembly includes a first conductive substrate, a first hydrophobic insulating layer, and a first pixel wall arranged in sequence along a direction toward the second supporting assembly, wherein the first pixel wall forms a first pixel grid;

[0007] The second support component includes a second conductive substrate, a second hydrophobic insulating layer, and a second pixel wall sequentially arranged in a direction towards the first support component. The second pixel wall encloses a second pixel cell;

[0008] The first sealing cavity is filled with immiscible conductive polar liquid and a first non-polar liquid. The first non-polar liquid includes non-polar liquid I and non-polar liquid II of different colors. The non-polar liquid I is filled in the first pixel cell, and the non-polar liquid II is filled in the second pixel cell. The conductive polar liquid is electrically connected to the first conductive substrate and the second conductive substrate respectively.

[0009] According to the co-cavity type color electro-wetting display device of the embodiment of the present invention, it has at least the following beneficial effects: By filling the conductive polar liquid, non-polar liquid I of different colors, and non-polar liquid II in the sealing cavity formed between the first support component and the second support component arranged opposite to each other at intervals. Specifically, the non-polar liquid I and the non-polar liquid II are filled in the first pixel cell of the first support component and the second pixel cell of the second support component respectively. The conductive polar liquid is located between the non-polar liquid I and the non-polar liquid II and is electrically connected to the first conductive substrate of the first support component and the second conductive substrate of the second support component respectively. Thus, the non-polar liquid I and the non-polar liquid II of different colors are filled in the same sealing cavity. The conductive polar liquid can be used as a common liquid electrode for driving the non-polar liquid I and the non-polar liquid II to move or deform. During the working process, a voltage can be applied between the first conductive substrate and the conductive polar liquid to drive the non-polar liquid I to move or deform, and a voltage can be applied between the second conductive substrate and the conductive polar liquid to drive the non-polar liquid II to move or deform. Thereby, the substrate structure of the electro-wetting display device can be simplified to realize co-cavity display of different colors. Moreover, by structurally thinning the device, the distance between the non-polar liquids of different color display layers is reduced, greatly alleviating the inherent problems of stereoscopic vision and color bleeding in the stacked display device. At the same time, the number of light transmission interfaces is reduced, which can greatly improve the light efficiency. Furthermore, the above structure can support a high-brightness and wide-color gamut electro-wetting display device based on the subtractive color mixing principle.

[0010] In some embodiments of the present invention, the first pixel wall and / or the second pixel wall is a conductive pixel wall. The conductive pixel wall can be used as a common counter electrode in contact with the conductive polar liquid for leading out, which can ingeniously solve the construction and leading-out problems of the common counter electrode necessary for co-cavity operation.

[0011] In some embodiments of the present invention, the first pixel wall includes a first insulating matrix and a first conductive layer. The first insulating matrix is disposed on the surface of the first hydrophobic insulating layer, and the first conductive layer is disposed on the end of the first insulating matrix facing away from the first hydrophobic insulating layer;

[0012] And / or, the second pixel wall includes a second insulating matrix and a second conductive layer. The second insulating matrix is disposed on the surface of the second hydrophobic insulating layer, and the second conductive layer is disposed on an end of the second insulating matrix facing away from the second hydrophobic insulating layer.

[0013] The conductive layer at the end in the above pixel wall can be used as a common counter electrode in contact with the conductive polar liquid, which can skillfully solve the construction and extraction problems of the common counter electrode necessary for the common cavity operation. And compared with using an integral conductive pixel wall, it can avoid the interference of the strong distorted electric field near the bonding interface between the integral conductive pixel wall and the hydrophobic insulating layer on the pixel manipulation function.

[0014] In some embodiments of the present invention, a first dielectric layer is provided between the first conductive substrate and the first hydrophobic insulating layer; and / or, a second dielectric layer is provided between the second conductive substrate and the second hydrophobic insulating layer. This can improve the withstand voltage ability of the device.

[0015] In some embodiments of the present invention, the first conductive substrate and / or the second conductive substrate is a transparent conductive substrate.

[0016] In some embodiments of the present invention, the first conductive substrate includes substrate I and a conductive layer I disposed on a surface of substrate I facing the second support assembly; and / or, the second conductive substrate includes substrate II and a conductive layer II disposed on a surface of substrate II facing the first support assembly.

[0017] In some embodiments of the present invention, substrate I and / or substrate II is a transparent substrate.

[0018] In some embodiments of the present invention, the conductive layer I and / or the conductive layer II is selected from at least one of an ITO layer and a TFT layer.

[0019] In some embodiments of the present invention, the material of the first hydrophobic insulating layer and / or the second hydrophobic insulating layer is selected from fluoropolymer materials.

[0020] In some embodiments of the present invention, the first pixel grid and the second pixel grid are symmetrically arranged facing each other.

[0021] In some embodiments of the present invention, the common cavity type color electro-wetting display device further includes a sealant frame, and the first support assembly and the second support assembly are connected through the sealant frame to form a first sealed cavity.

[0022] In some embodiments of the present invention, the second conductive substrate is a double-sided conductive substrate;

[0023] The co-cavity type color electro-wetting display device further includes a third support assembly. A second sealed cavity is formed between the third support assembly and the second support assembly. The third support assembly includes a third conductive substrate, a third hydrophobic insulating layer, and a third pixel wall sequentially arranged in a direction towards the second support assembly. The third pixel wall encloses a third pixel cell; the second sealed cavity is filled with an immiscible polar liquid and a second non-polar liquid, and the second non-polar liquid is filled in the third pixel cell.

[0024] The above-mentioned double-sided conductive substrate is introduced and disposed between the first support assembly and the third support assembly. Its double-sided conductivity can not only serve as the lower substrate of the upper display unit but also as the lower substrate of the lower display unit, significantly reducing the thickness of the final device, reducing the number of light transmission interfaces, effectively reducing light loss, increasing the reflectivity of the device, and greatly improving the light efficiency; at the same time, it also thins and shortens the distance between the non-polar liquids of different color display layers, greatly alleviating the inherent stereoscopic vision and color bleeding problems of the stacked display device.

[0025] In some embodiments of the present invention, the double-sided conductive substrate includes a substrate II and conductive layers II separately disposed on both side surfaces of the substrate II.

[0026] In some embodiments of the present invention, the double-sided conductive substrate is a double-sided transparent conductive substrate. For example, the double-sided conductive substrate can be selected from an ITO glass substrate or a transmissive TFT glass substrate.

[0027] The second non-polar liquid, the non-polar liquid I, and the non-polar liquid II are all color display liquids. In some embodiments of the present invention, the color of the second non-polar liquid is different from the colors of the non-polar liquid I and the non-polar liquid II.

[0028] In some embodiments of the present invention, the non-polar liquid I, the non-polar liquid II, and the second non-polar liquid are each independently selected from any one of different color inks such as yellow ink, magenta ink, and cyan ink.

[0029] In some embodiments of the present invention, the third pixel wall is an insulating pixel wall.

[0030] In some embodiments of the present invention, the third pixel cell is arranged corresponding to the first pixel cell and the second pixel cell.

[0031] In some embodiments of the present invention, the conductive polar liquid is a mixed solution of ethylene glycol and glycerol.

[0032] In some embodiments of the present invention, the material of the third hydrophobic insulating layer is selected from fluoropolymer materials.

[0033] In some embodiments of the present invention, a third dielectric layer is provided between the third conductive substrate and the third hydrophobic insulating layer to improve the voltage withstand capacity of the device.

[0034] In some embodiments of the present invention, the third conductive substrate includes a substrate III and a conductive layer III provided on a surface of the substrate III facing the second support assembly.

[0035] In some embodiments of the present invention, the third conductive substrate is a transparent conductive substrate.

[0036] In some embodiments of the present invention, the substrate III is a transparent substrate; and / or, the conductive layer III is selected from at least one of an ITO layer and a TFT layer.

[0037] In some embodiments of the present invention, the first support assembly is a transmissive support assembly and the third support assembly is a reflective support assembly; or, the first support assembly is a reflective support assembly and the third support assembly is a transmissive support assembly.

[0038] In some embodiments of the present invention, the second support assembly further includes a fourth hydrophobic insulating layer and a fourth pixel wall sequentially provided on a side of the second conductive substrate facing away from the second hydrophobic insulating layer and along a direction towards the third support assembly, and the fourth pixel wall encloses a fourth pixel cell;

[0039] A third non-polar liquid immiscible with the polar liquid is further filled in the second sealed cavity, and the third non-polar liquid is filled in the fourth pixel cell; the polar liquid is a conductive polar liquid, and the polar liquid is electrically connected to the second conductive substrate and the third conductive substrate respectively.

[0040] In some embodiments of the present invention, the third pixel wall and / or the fourth pixel wall is a conductive pixel wall.

[0041] In some embodiments of the present invention, the third pixel wall includes a third insulating matrix and a third conductive layer, the third insulating matrix is provided on the surface of the third hydrophobic insulating layer, and the third conductive layer is provided at an end of the third insulating matrix facing away from the third hydrophobic insulating layer; and / or, the fourth pixel wall includes a fourth insulating matrix and a fourth conductive layer, the fourth insulating matrix is provided on the surface of the fourth hydrophobic insulating layer, and the fourth conductive layer is provided at an end of the fourth insulating matrix facing away from the fourth hydrophobic insulating layer.

[0042] The third non-polar liquid is also a display liquid. In some embodiments of the present invention, the color of the third non-polar liquid is different from the colors of the non-polar liquid I, the non-polar liquid II, and the second non-polar liquid, that is, the non-polar liquid I, the non-polar liquid II, the second non-polar liquid, and the third non-polar liquid are four display liquids with different colors.

[0043] In some embodiments of the present invention, the polar liquid I, the non-polar liquid II, the second non-polar liquid, and the third non-polar liquid are each independently selected from any one of different color inks such as yellow ink, magenta ink, cyan ink, and black ink, which can form a CMYK subtractive color mixing electro-wetting display device. Among them, CMYK is the abbreviation of four colors: cyan, magenta, yellow, and black.

[0044] In some embodiments of the present invention, the third pixel cell and the fourth pixel cell are symmetrically arranged facing each other. Further, the third pixel cell and the fourth pixel cell are arranged corresponding to the first pixel cell and the second pixel cell.

[0045] In some embodiments of the present invention, the common cavity type color electro-wetting display device includes a sealing rubber frame, and the sealing rubber frame includes a first sealing rubber frame and a second sealing rubber frame; the first support assembly and the second support assembly are connected through the first sealing rubber frame to form a first sealed cavity, and the second support assembly and the third support assembly are connected through the second sealing rubber frame to form a second sealed cavity.

[0046] In the second aspect of the present invention, a preparation method of any one of the foregoing common cavity type color electro-wetting display devices of the present invention is proposed, including:

[0047] Preparing the first support assembly and the second support assembly;

[0048] Filling the non-polar liquid I into the first pixel cell of the first support assembly, and filling the non-polar liquid II into the second pixel cell of the second support assembly;

[0049] Performing a freezing treatment on the non-polar liquid I to make it phase-change and solidify, and / or performing a freezing treatment on the non-polar liquid II to make it phase-change and solidify;

[0050] Filling the conductive polar body fluid; then inverting the first support assembly filled with the solidified non-polar liquid I and fitting and packaging it in alignment with the second support assembly, or inverting the second support assembly filled with the solidified non-polar liquid II and fitting and packaging it in alignment with the first support assembly.

[0051] In some embodiments of the present invention, preparing the first support assembly includes: obtaining or preparing a first conductive substrate, and then sequentially preparing a first hydrophobic insulating layer and a first pixel wall on one surface of the first conductive substrate, and the first pixel wall encloses a first pixel cell;

[0052] And / or, preparing the second support assembly includes: obtaining or preparing a second conductive substrate, and then sequentially preparing a second hydrophobic insulating layer and a second pixel wall on one side surface of the second conductive substrate, and the second pixel wall encloses a second pixel cell.

[0053] In some embodiments of the present invention, before preparing the first hydrophobic insulating layer on the surface of the first conductive substrate, first prepare a first dielectric layer on the surface of the first conductive substrate, and then sequentially prepare the first hydrophobic insulating layer and the first pixel wall on the surface of the first dielectric layer facing away from the first conductive substrate;

[0054] And / or, before preparing the second hydrophobic insulating layer on the surface of the second conductive substrate, first prepare a second dielectric layer on the surface of the second conductive substrate, and then sequentially prepare the second hydrophobic insulating layer and the second pixel wall on the surface of the second dielectric layer facing away from the second conductive substrate.

[0055] In some embodiments of the present invention, the preparation of the first pixel wall includes: first preparing a first insulating matrix on the surface of the first hydrophobic insulating layer facing away from the first conductive substrate, and then arranging a first conductive layer at the end of the first insulating matrix facing away from the first hydrophobic insulating layer;

[0056] And / or, the preparation of the second pixel wall includes: first preparing a second insulating matrix on the surface of the second hydrophobic insulating layer facing away from the second conductive substrate, and then arranging a second conductive layer at the end of the second insulating matrix facing away from the second hydrophobic insulating layer.

[0057] In some embodiments of the present invention, the second conductive substrate in the second support assembly is a double-sided conductive substrate;

[0058] The preparation method of the common cavity type color electro-wetting display device further includes: preparing the third support assembly, filling a second non-polar liquid into the third pixel cell of the third support assembly; then filling a polar liquid, and then aligning and bonding and packaging the third support assembly filled with the second non-polar liquid with the side surface of the second support assembly facing away from the first support assembly.

[0059] In some embodiments of the present invention, after filling the non-polar liquid into the third pixel cell of the third support assembly, first perform a freezing treatment on the second non-polar liquid to make it phase-change and solidify, and then fill the polar liquid.

[0060] In some embodiments of the present invention, preparing the third support assembly includes: obtaining or preparing a third conductive substrate, and then sequentially preparing a third hydrophobic insulating layer and a third pixel wall on one side surface of the third conductive substrate, and the third pixel wall encloses a third pixel cell.

[0061] In some embodiments of the present invention, before preparing the third hydrophobic insulating layer on the surface of the third conductive substrate, first prepare a third dielectric layer on the surface of the third conductive substrate, and then sequentially prepare a third hydrophobic insulating layer and a third pixel wall on the surface of the third dielectric layer facing away from the third conductive substrate.

[0062] In some embodiments of the present invention, the second conductive substrate is a double-sided conductive substrate, and preparing the second support assembly further includes: providing a fourth hydrophobic insulating layer on one side surface of the second conductive substrate facing away from the second hydrophobic insulating layer.

[0063] In some embodiments of the present invention, the second conductive substrate is a double-sided conductive substrate, and the second support assembly further includes a fourth hydrophobic insulating layer and a fourth pixel wall sequentially provided on one side of the second conductive substrate facing away from the second hydrophobic insulating layer, and the fourth pixel wall encloses a fourth pixel cell; correspondingly, when preparing the second support assembly, it may further include: sequentially providing a fourth hydrophobic insulating layer and a fourth pixel wall on one side of the second conductive substrate facing away from the second hydrophobic insulating layer, and the fourth pixel wall encloses a fourth pixel cell;

[0064] The method for preparing the common cavity type color electro-wetting display device further includes:

[0065] Filling a third non-polar liquid into the fourth pixel cell of the second support assembly;

[0066] Performing a freezing treatment on the second non-polar liquid to cause it to phase change and solidify, and / or performing a freezing treatment on the third non-polar liquid to cause it to phase change and solidify;

[0067] Then filling with a polar liquid; then inverting the third support assembly filled with the solidified second non-polar liquid and aligning and bonding it with the second support assembly, or inverting the second support assembly filled with the solidified third non-polar liquid and aligning and bonding it with the third support assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] The present invention will be further described below in conjunction with the drawings and embodiments, where:

[0069] Figure 1 is a schematic structural diagram of a conventional full-color electro-wetting display device;

[0070] Figure 2 is a schematic structural diagram of an embodiment of the common cavity type color electro-wetting display device of the present invention;

[0071] Figure 3 Schematic structural diagram of another embodiment of the common cavity type color electro-wetting display device of the present invention;

[0072] Figure 4 Schematic structural diagram of another embodiment of the common cavity type color electro-wetting display device of the present invention;

[0073] Figure 5 Schematic structural diagram of yet another embodiment of the common cavity type color electro-wetting display device of the present invention;

[0074] Figure 6 is Figure 2 Step profiler scan diagram of the side of the pixel wall where the upper end of the second support component has a conductive layer in the shown common cavity type color electro-wetting display device;

[0075] Figure 7 is Figure 2 Schematic structural relationship diagram of the first support component and the first encapsulation rubber frame in the shown common cavity type color electro-wetting display device;

[0076] Figure 8 is to use an integral conductive pixel wall instead of Figure 2 Ink opening test results of the common cavity type color electro-wetting display device constructed by the second pixel wall with a conductive layer at the end in;

[0077] Figure 9 is Figure 2 Ink opening test results of the shown common cavity type color electro-wetting display device;

[0078] Figure 10 is to use an integral conductive pixel wall instead of Figure 2 Simulation diagram of the distribution of the local electric field and electric potential equipotential lines in the integral conductive pixel wall region in the common cavity type color electro-wetting display device constructed by the second pixel wall with a conductive layer at the end in;

[0079] Figure 11 is Figure 2 Simulation diagram of the distribution of the local electric field and electric potential equipotential lines in the region of the second pixel wall with a conductive layer at the end in the shown common cavity type color electro-wetting display device;

[0080] Figure 12 is Figure 2 Schematic diagram of the CMY subtractive color mixing principle of the shown common cavity type color electro-wetting display device;

[0081] Figure 13 is Figure 1 Shown traditional full-color electro-wetting display device and Figure 2 Comparison diagram of the crosstalk area test results of the shown common cavity type color electro-wetting display device;

[0082] Figure 14 isFigure 2 Schematic diagram of the preparation of the structural components in the shown common cavity type color electro-wetting display device;

[0083] Figure 15 For Figure 2 Schematic diagram of the preparation of the conductive layer at the end of the second pixel wall in the structural components of the shown common cavity type color electro-wetting display device;

[0084] Figure 16 For Figure 2 Schematic diagram of fluid filling and device assembly in the shown common cavity type color electro-wetting display device. Detailed implementation manners

[0085] The concept of the present invention and the technical effects generated will be clearly and completely described below in conjunction with the embodiments, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0086] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0087] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0088] In the description of the present invention, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or the sequence relationship of the indicated technical features.

[0089] In the description of the present invention, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0090] In the description of the present invention, the descriptions with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0091] For the experimental methods without specific conditions noted in the following embodiments, they are generally in accordance with the conventional conditions in the art or the conditions recommended by the manufacturer; for the raw materials, reagents, etc. used, unless otherwise specified, they are all raw materials and reagents that can be obtained from commercial channels such as the conventional market. The yellow, magenta, and cyan inks used in the embodiments of the present invention can be obtained from commercial channels such as the conventional market or can be prepared by oneself. Among them, the dyes in the inks prepared by oneself can be purchased commercially or can be synthesized by oneself. The references for the synthesis of the inks or / and dyes include, but are not limited to: Deng Yong, Tang Biao, Guo Yuanyuan, etc. Research progress of electro-wetting display color ink materials [J]. Journal of South China Normal University (Natural Science Edition), 2016, 48(5): 31-36; or, Li Shi, Deng Yong, Ye Dechao, etc. Preparation of highly hydrophobic nano-color particles and their application in electro-wetting display [J]. Journal of Materials Science and Engineering, 2020, 38(3): 494-502.

[0092] The present invention provides a common cavity type color electro-wetting display device. Please refer to Figure 2 , Figure 2It is a schematic structural diagram of an embodiment of a common cavity type color electro-wetting display device of the present invention. The common cavity type color electro-wetting display device includes a first support component 10 and a second support component 20. A first sealed cavity 40 is formed between the first support component 10 and the second support component 20. The first support component 10 includes a first conductive substrate 11, a first hydrophobic insulating layer 13, and a first pixel wall 14 arranged in sequence along the direction towards the second support component 20. The first pixel wall 14 encloses a first pixel cell; the second support component 20 includes a second conductive substrate 21, a second hydrophobic insulating layer 23, and a second pixel wall 24 arranged in sequence along the direction towards the first support component 10. The second pixel wall 24 encloses a second pixel cell; The first sealed cavity 40 is filled with immiscible conductive polar liquid 41 and a first non-polar liquid 42. The first non-polar liquid 42 includes non-polar liquid I 421 and non-polar liquid II 422 of different colors. The non-polar liquid I 421 is filled in the first pixel cell, and the non-polar liquid II 422 is filled in the second pixel cell. The conductive polar liquid 41 is located between the non-polar liquid I 421 and the non-polar liquid II 422, and the conductive polar liquid 41 is electrically connected to the first conductive substrate 11 and the second conductive substrate 21 respectively. Thus, non-polar liquid I 421 and non-polar liquid II 422 of different colors are filled in the same sealed cavity, and a common cavity structure (or a two-color common cavity display unit) is formed between the first support component 10 and the second support component 20. The conductive polar liquid 41 can be used as a common liquid electrode for driving the non-polar liquid I 421 and the non-polar liquid II 422 to move or deform. During operation, a voltage can be applied between the first conductive substrate 11 and the conductive polar liquid 41 to drive the non-polar liquid I 421 to move or deform, so that the non-polar liquid I 421 is in a spreading state or a contracting state in the first pixel cell, thereby realizing the closing or opening of the corresponding pixel cell; a voltage can be applied between the second conductive substrate 21 and the conductive polar liquid 41 to drive the non-polar liquid II 422 to move or deform, so that the non-polar liquid II 422 is in a spreading state or a contracting state in the second pixel cell.

[0093] The above structural settings can simplify the substrate structure of the electro-wetting display device and achieve common cavity display of different colors; moreover, by structurally thinning the device, the distance between the non-polar liquids of the color display layers of different colors is reduced, greatly alleviating the inherent problems of stereoscopic vision and color bleeding in the stacked display device; at the same time, the number of light transmission interfaces is reduced, which can improve the optical properties such as the reflectivity and transmittance of the device, greatly improving the light efficiency. Therefore, the above structure can support the construction of a high-brightness and wide-color-gamut electro-wetting display device based on the subtractive color mixing principle.

[0094] The first conductive substrate 11 and / or the second conductive substrate 21 may be a transparent conductive substrate. For example, it may be an ITO glass substrate or a transmissive TFT glass substrate. Further, in some embodiments, the first conductive substrate 11 may include a substrate I and a conductive layer I provided on one surface of the substrate I facing the second support assembly 20; and / or, the second conductive substrate 21 may include a substrate II and a conductive layer II provided on one surface of the second substrate facing the first support assembly 10. Among them, the substrate I and / or the substrate II may be a transparent substrate, such as a glass substrate or other transparent substrates; the conductive layer I and / or the conductive layer II may be selected from at least one of an ITO layer (i.e., a transparent indium tin oxide conductive layer) and a TFT layer.

[0095] In this embodiment, the first conductive substrate 11 is a single-sided ITO conductive glass substrate, which is a single-sided conductive substrate. Specifically, it includes a substrate I and a conductive layer I provided on one surface of the substrate I facing the second support assembly 20. Among them, the substrate I is a glass substrate and the conductive layer I is an ITO layer. The conductive layer I serves as a driving electrode for the movement or deformation of the non-polar liquid I 421. Specifically, by applying a voltage between the conductive layer I and the conductive polar liquid 41, the movement or deformation of the non-polar liquid I 421 can be driven. The second conductive substrate 21 is a double-sided TO conductive glass substrate, which is a double-sided conductive substrate. Specifically, it includes a substrate II and conductive layers II separately provided on both sides of the substrate II. That is, conductive layers II are provided on the surfaces of the substrate II facing and facing away from the first support assembly 10. The substrate II is a glass substrate and the conductive layer II is an ITO layer. The conductive layer II on the substrate II facing the first support assembly 10 can serve as a driving electrode for the movement or deformation of the non-polar liquid II 422. Specifically, by applying a voltage between it and the conductive polar liquid 41, the movement or deformation of the non-polar liquid II 422 can be driven.

[0096] On the basis of using a double-sided conductive substrate as the second conductive substrate 21, the co-cavity color electro-wetting display device of this embodiment further includes a third support assembly 30. A second sealing cavity 50 is formed between the third support assembly 30 and the second support assembly 20. The third support assembly 30 includes a third conductive substrate 31, a third hydrophobic insulating layer 33, and a third pixel wall 34 arranged in sequence in the direction towards the second support assembly 20. The third pixel wall 34 encloses third pixel cells; the second sealing cavity 50 is filled with immiscible polar liquid 51 and a second non-polar liquid 52. The second non-polar liquid 52 is filled in the third pixel cells, and the polar liquid 51 is located between the second non-polar liquid 52 and the second support assembly 20. Thus, a monochromatic display unit is formed between the second support assembly 20 and the third support assembly 30. The second non-polar liquid 52 filled in the third pixel cells in the monochromatic display unit can be controlled by the second conductive substrate 21 and the third conductive substrate 31. Specifically, by applying a voltage between the second conductive substrate 21 and the third conductive substrate 31 to drive the second non-polar liquid 52 to move or deform, the second non-polar liquid 52 can be in a spreading state or a contracting state in the third pixel cells, thereby realizing the closing and opening of the corresponding pixel cells.

[0097] The double-sided conductive substrate is introduced above and is arranged between the first support assembly 10 and the third support assembly 20. Based on the double-sided conductivity of the double-sided conductive substrate, it can not only serve as the lower substrate of the upper display unit but also as the lower substrate of the lower display unit. This significantly reduces the thickness of the final device, reduces the number of light transmission interfaces, effectively reduces light loss, improves the reflectivity of the device, and greatly improves the light efficiency; at the same time, it also thins and shortens the distance between the non-polar liquids of different color display layers, greatly alleviating the inherent stereoscopic vision and color bleeding problems of the stacked display device.

[0098] In this embodiment, the third conductive substrate 31 is similar to the first conductive substrate 11 and is a single-sided conductive substrate, specifically a single-sided ITO conductive glass substrate, including a substrate III and a conductive layer III provided on the surface of the substrate III facing the second support assembly 20. The substrate III is a glass substrate, and the conductive layer III is an ITO layer; in other embodiments, the third conductive substrate 31 can be selected as other conductive substrates according to requirements.

[0099] The materials of the hydrophobic insulating layers (including the first hydrophobic insulating layer 13, the second hydrophobic insulating layer 23, and the third hydrophobic insulating layer 33) on each support assembly can be independently selected from fluoropolymer materials, and the fluoropolymer materials include but are not limited to Hyflon (such as Hyflon AD registered trademark, manufactured by Solvay), AF1600X (Chemours), Cytop, etc.

[0100] To improve the breakdown voltage resistance of the device, in the electro-wetting display device of this embodiment, a first dielectric layer 12 is provided between the first conductive substrate 11 and the first hydrophobic insulating layer 13, a second dielectric layer 22 is provided between the second conductive substrate 21 and the second hydrophobic insulating layer 23, and a third dielectric layer 32 is provided between the third conductive substrate 31 and the third hydrophobic insulating layer 33. The material of each dielectric layer can be a photoresist material. Of course, in other embodiments, the setting of one or more of the above dielectric layers can be cancelled.

[0101] To improve the display efficiency, it can be designed that the first pixel cell and the second pixel cell are symmetrically arranged facing each other; and generally, the third pixel cell is also arranged corresponding to the first pixel cell and the second pixel cell.

[0102] Among the fluids filled in the first sealing cavity 40, the conductive polar liquid 41 is a mixture of ethylene glycol and glycerol, which is not easy to volatilize and has high durability; in other embodiments, the conductive polar liquid 41 can also be other conductive polar liquids. The polar liquid 51 filled in the second sealing cavity 50 can be pure water or other polar liquids.

[0103] The non-polar liquid I 421, the non-polar liquid II 422 and the second non-polar liquid 52 are all color display liquids. And generally, the color of the second non-polar liquid 52 is different from the colors of the non-polar liquid I 421 and the non-polar liquid II 422, that is, the non-polar liquid I 421, the non-polar liquid II 422 and the second non-polar liquid 52 are three color display liquids with different colors.

[0104] In some embodiments, the non-polar liquid I 421, the non-polar liquid II 422 and the second non-polar liquid 52 can each independently be selected from any one of different color inks such as yellow ink, magenta ink and cyan ink, that is, the non-polar liquid I 421, the non-polar liquid II 422 and the second non-polar liquid 52 have different colors and can each independently be selected from any one of yellow ink, magenta ink and cyan ink, so as to construct a CMY subtractive color mixing electro-wetting display device, where CMY is the abbreviation of three colors: cyan, magenta and yellow. The non-polar liquid I 421 and the non-polar liquid II 422, as two color display liquids in the first sealing cavity 40 in the co-cavity display structure of the electro-wetting display device, the two color display liquids can be selected from any two of yellow ink, magenta ink and cyan ink. In this embodiment, according to the characteristics of the visual sensitivity of the human eye, the three non-polar liquids of the non-polar liquid I 421, the non-polar liquid II 422 and the second non-polar liquid 52 are arranged in the order of "yellow - magenta - cyan" from top to bottom, that is, the non-polar liquid I 421, the non-polar liquid II 422 and the second non-polar liquid 52 are respectively selected from yellow ink, magenta ink and cyan ink.

[0105] In other embodiments, the color - developing liquid can also be arranged in other ways. For example, in some embodiments, the non - polar liquid I 421, the non - polar liquid II 422, and the second non - polar liquid 52 are respectively selected from yellow ink, cyan ink, and magenta ink; in some embodiments, the non - polar liquid I 421, the non - polar liquid II 422, and the second non - polar liquid 52 are respectively selected from magenta ink, yellow ink, and cyan ink; in some embodiments, the non - polar liquid I 421, the non - polar liquid II 422, and the second non - polar liquid 52 are respectively selected from magenta ink, cyan ink, and yellow ink; in some embodiments, the non - polar liquid I 421, the non - polar liquid II 422, and the second non - polar liquid 52 are respectively selected from cyan ink, yellow ink, and magenta ink; and as Figure 3 shown, in some embodiments, the non - polar liquid I 421’, the non - polar liquid II 422’, and the second non - polar liquid 52 are respectively selected from cyan ink, magenta ink, and yellow ink, and Figure 3 the other structures of the common - cavity type color electro - wetting display device shown are Figure 2 basically the same as those of the common - cavity type color electro - wetting display device shown.

[0106] Of course, in some other embodiments, the non - polar liquid I 421, the non - polar liquid II 422, and the second non - polar liquid 52 can also be color - developing liquids of other different colors.

[0107] In addition, in this embodiment, the first support assembly 10 is a transmissive support assembly, and the third support assembly 30 is a reflective support assembly. In other embodiments, it can also be adjusted and designed according to needs. For example, the first support assembly 10 can be designed as a reflective support assembly, and the third support assembly 30 can be designed as a transmissive support assembly.

[0108] To facilitate the construction and lead - out of the common electrode in the common - cavity structure, in some embodiments, the first pixel wall 14 and / or the second pixel wall 24 can adopt conductive pixel walls; alternatively, the first pixel wall 14 and / or the second pixel wall 24 can also be designed to include an insulating matrix and a conductive layer, where the insulating matrix is disposed on the surface of the corresponding hydrophobic insulating layer, and the conductive layer is disposed at the end of the insulating matrix facing away from the hydrophobic insulating layer. In this way, the conductive pixel wall or the conductive layer on the pixel wall can be used as the common counter - electrode in contact with the conductive polar liquid 41, thereby cleverly solving the problem of the construction and lead - out of the common counter - electrode necessary for common - cavity operation.

[0109] Furthermore, the inventors have found through research that if a monolithic conductive pixel wall is used in the common cavity structure, the charges around the ink will remain in a balanced state, resulting in an overly uniform electric field distribution. The electric force on the ink is relatively mild, causing the interaction force between the charges inside the ink to remain stable and making it difficult for the ink to break due to the repulsive force caused by charge imbalance, which is contrary to the original purpose of controlling the movement of the ink. Therefore, the strong distorted electric field near the interface between the monolithic conductive pixel wall and the hydrophobic insulating layer may interfere with pixel manipulation. By constructing a pixel wall including an insulating substrate and a conductive layer provided at the end of the insulating substrate on at least one side of the common cavity structure, the interference of the strong distorted electric field near the interface between the pixel wall and the hydrophobic insulating layer on pixel manipulation can be avoided, improving the stability and service life of the device.

[0110] Specifically, in some embodiments, it can be designed such that the first pixel wall includes a first insulating substrate and a first conductive layer. The first insulating substrate is provided on the surface of the first hydrophobic insulating layer, and the first conductive layer is provided at the end of the first insulating substrate facing away from the first hydrophobic insulating layer; the second pixel wall can be a conductive pixel wall or an insulating pixel wall. Or, as Figure 2 shown, in this embodiment, the second pixel wall 24 includes a second insulating substrate 241 and a second conductive layer 242. The second insulating substrate 241 is provided on the surface of the second hydrophobic insulating layer 23, and the second conductive layer 242 is provided at the end of the second insulating substrate 241 facing away from the second hydrophobic insulating layer 23; the first pixel wall is an insulating pixel wall; the step profiler scan diagram of the pixel wall setting layer with a conductive layer at the upper end of the second support component in this electro-wetting display device is as Figure 6 shown. Of course, in some embodiments, based on the second pixel wall structure of the electro-wetting display device shown above, the first pixel wall can also be designed as a conductive pixel wall. Or, in some embodiments, as Figure 2 shown, on the basis of the second pixel wall structure of the electro-wetting display device shown above, the first pixel wall can also be designed as a conductive pixel wall. Or, in some embodiments, as Figure 4 and Figure 5 shown, both the first pixel wall and the second pixel wall in the common cavity structure can be designed as pixel walls similar to those including an insulating substrate and a conductive layer provided at the end of the insulating substrate. Specifically, Figure 4 and Figure 5 shown, the first pixel wall 14' in the common cavity type color electro-wetting display device includes a first insulating substrate 141 provided on the surface of the first hydrophobic insulating layer 13 and a first conductive layer 142 provided at the end of the first insulating substrate 141 facing away from the first hydrophobic insulating layer 13, and Figure 4 shown, the other structures of the common cavity type color electro-wetting display device are basically the same as those of the common cavity type color electro-wetting display device shown in Figure 2 shown, Figure 5 shown, the other structures of the common cavity type color electro-wetting display device are basically the same as those of the common cavity type electro-wetting display device shown in Figure 3 shown.

[0111] Specifically, the inventor replaced the second pixel wall 24 with a conductive layer 242 provided at the inner end of the common cavity structure constructed between the first support assembly 10 and the second support assembly 20 in the shown common cavity type color electro-wetting display device with an integral conductive pixel wall 24', and carried out an operation experiment on the shown common cavity type color electro-wetting display device, and investigated and compared the opening and closing conditions of the non-polar liquid in the second pixel wall 24 with the conductive layer 242 provided at the end and the integral conductive pixel wall 24", as well as the electric field and equipotential line distribution of the corresponding local part of the pixel wall after applying voltage. The obtained results are as shown in Figure 2 It was verified through testing that if an integral conductive pixel wall 24' is adopted in the common cavity structure, the strong distorted electric field near the interface between the pixel wall and the second hydrophobic insulating layer 23 will interfere with the pixel control function and disrupt the normal movement and rupture of the ink; while the pixel wall constructed by setting a conductive layer at the end of the insulating pixel wall substrate facing away from the conductive substrate will not affect the normal opening and closing of the ink. Therefore, by constructing a pixel wall including an insulating substrate and a conductive layer provided at the end of the insulating substrate on at least one side in the common cavity structure, the functions of the common electrode and the pixel wall opening and closing can be realized. Further, considering the process simplification and cost, a pixel wall including an insulating substrate and a conductive layer provided at the end of the insulating substrate can be constructed on one side (i.e., one-sided) in the common cavity structure to simplify the process and reduce the cost. Figure 2 It was verified through testing that if an integral conductive pixel wall 24' is adopted in the common cavity structure, the strong distorted electric field near the interface between the pixel wall and the second hydrophobic insulating layer 23 will interfere with the pixel control function and disrupt the normal movement and rupture of the ink; while the pixel wall constructed by setting a conductive layer at the end of the insulating pixel wall substrate facing away from the conductive substrate will not affect the normal opening and closing of the ink. Therefore, by constructing a pixel wall including an insulating substrate and a conductive layer provided at the end of the insulating substrate on at least one side in the common cavity structure, the functions of the common electrode and the pixel wall opening and closing can be realized. Further, considering the process simplification and cost, a pixel wall including an insulating substrate and a conductive layer provided at the end of the insulating substrate can be constructed on one side (i.e., one-sided) in the common cavity structure to simplify the process and reduce the cost. Figures 8 to 11 It was verified through testing that if an integral conductive pixel wall 24' is adopted in the common cavity structure, the strong distorted electric field near the interface between the pixel wall and the second hydrophobic insulating layer 23 will interfere with the pixel control function and disrupt the normal movement and rupture of the ink; while the pixel wall constructed by setting a conductive layer at the end of the insulating pixel wall substrate facing away from the conductive substrate will not affect the normal opening and closing of the ink. Therefore, by constructing a pixel wall including an insulating substrate and a conductive layer provided at the end of the insulating substrate on at least one side in the common cavity structure, the functions of the common electrode and the pixel wall opening and closing can be realized. Further, considering the process simplification and cost, a pixel wall including an insulating substrate and a conductive layer provided at the end of the insulating substrate can be constructed on one side (i.e., one-sided) in the common cavity structure to simplify the process and reduce the cost.

[0112] In addition, in the common cavity structure, the material of the conductive layer on the pixel wall can be a photosensitive conductive polymer material (such as PEDOT) or a conductive photoresist material, and can be specifically prepared by methods such as inkjet printing and lithography.

[0113] As described above, Figures 2 to 5 the shown common cavity type color electro-wetting display device includes stacked dual-color common cavity display units and monochromatic display units. In some embodiments, the second conductive substrate 21 in the second support assembly 20 can also adopt a single-sided conductive substrate, and the structure on the side of the second support assembly 20 facing away from the first support assembly 10 in this embodiment can be cancelled, that is, the monochromatic display unit is cancelled. Thus, the electro-wetting display device only includes the first support assembly 10, the second support assembly 20, and the dual-color common cavity display unit constructed by the structure between the two.

[0114] In some embodiments, the first conductive substrate 11 in the first support assembly 10 can also adopt a double-sided conductive substrate, and on the side of the first support assembly 10 facing away from the second support assembly 20, referring to the structure between the second support assembly 20 and the third support assembly 30 and the structure therebetween in the shown common cavity type color electro-wetting display device, a similar monochromatic display unit is constructed. Thus, the electro-wetting display device includes a dual-color common cavity display unit and monochromatic display units separately disposed on both sides of the dual-color common cavity display unit in the back direction. Figure 2 In some embodiments, the first conductive substrate 11 in the first support assembly 10 can also adopt a double-sided conductive substrate, and on the side of the first support assembly 10 facing away from the second support assembly 20, referring to the structure between the second support assembly 20 and the third support assembly 30 and the structure therebetween in the shown common cavity type color electro-wetting display device, a similar monochromatic display unit is constructed. Thus, the electro-wetting display device includes a dual-color common cavity display unit and monochromatic display units separately disposed on both sides of the dual-color common cavity display unit in the back direction.

[0115] In some embodiments, on the side of the second support component 20 facing away from the first support component 10, and / or on the side of the first support component 10 facing away from the second support component 20, one or more co-cavity display units may be constructed in a manner similar to the dual-color co-cavity display unit constructed between the first support component 10 and the second support component 20. Additionally, on this basis, a monochrome display unit may further be constructed on the side of the outermost co-cavity display unit on one or both sides facing away from the adjacent co-cavity display unit.

[0116] For example, in some embodiments, the second support component 20 further includes a fourth hydrophobic insulating layer 26 and a fourth pixel wall sequentially arranged along the direction towards the third support component 30 on the side of the second conductive substrate 21 facing away from the second hydrophobic insulating layer 23. The fourth pixel wall encloses a fourth pixel cell; in addition to the immiscible polar liquid 51 and the second non-polar liquid 52 filled in the second sealed cavity 50, a third non-polar liquid immiscible with the polar liquid 51 is also filled. The third non-polar liquid is filled in the fourth pixel cell. The polar liquid 51 is specifically a conductive polar liquid, and the polar liquid 51 is electrically connected to the second conductive substrate 21 and the third conductive substrate 31 respectively; wherein, the color of the third non-polar liquid is generally different from the color of the second non-polar liquid 52; the fourth pixel cell and the third pixel cell are symmetrically arranged facing each other. Through the above structural design, the distance between the non-polar liquids of different color display layers can also be reduced and thinned, alleviating the inherent three-dimensional and color bleeding problems of the stacked display device; at the same time, the number of light transmission interfaces is reduced, improving the light efficiency. Additionally, for the specific structure of the co-cavity display unit constructed between the second support component 20 and the third support component 30, reference may be made to Figure 2 the co-cavity display unit constructed between the first support component 10 and the second support component 20 in the shown co-cavity type color electro-wetting display device, which will not be elaborated herein.

[0117] In some embodiments, other stacked forms (such as the co-cavity display unit and the monochrome display unit being sequentially stacked or other forms) of the co-cavity type color electro-wetting display device may also be constructed according to the above construction methods of the co-cavity display unit and the monochrome display unit. Thus, the co-cavity type color electro-wetting display device includes at least one co-cavity display unit (or dual-color co-cavity display unit), and the number of co-cavity display units can be designed according to requirements, such as 1, 2, 3, 5, etc.

[0118] In addition, considering the shrinkage heights of the two inks in the common cavity display unit, in a common cavity type color electro-wetting display device, it is usually designed that the thickness of the common cavity display unit is equivalent to or greater than the thickness of the single-color display unit. That is, the distance between the two support components in the common cavity display unit is usually equivalent to or greater than the distance between the two support components in the single-color display unit. For example, in this embodiment, the distance between the first support component 10 and the second support component 20 is greater than the distance between the second support component and the third support component 30.

[0119] In the above common cavity type color electro-wetting display device, adjacent support components are generally connected by a sealing rubber frame to form a sealed cavity, and then a fluid including a polar liquid and a non-polar liquid is filled in the sealed cavity to construct a display unit. The electro-wetting display device of this embodiment further includes a sealing rubber frame 60, and the sealing rubber frame 60 includes a first sealing rubber frame 61 and a second sealing rubber frame 62; the first support component 10 and the second support component 20 are connected by the first sealing rubber frame 61 to form a first sealed cavity 40, and the second support component 10 and the third support component 20 are connected by the second sealing rubber frame 62 to form a second sealed cavity 50. The schematic structural relationship diagram of the first support component 10 and the first encapsulation rubber frame 61 is as Figure 7 shown.

[0120] The common cavity type color electro-wetting display device of this embodiment can be driven and controlled in the following manner: the non-polar liquid I 421 in the electro-wetting display device is controlled by the first conductive substrate 11 and the conductive polar liquid 41 in the first sealed cavity 40, the non-polar liquid II 422 is controlled by the conductive polar liquid 41 in the first sealed cavity 40 and the second conductive substrate 21, and the second non-polar liquid 52 is controlled by the second conductive substrate 21 and the third conductive substrate 31. The magnitude of the applied voltage can be controlled separately for each layer to control the wettability of the corresponding hydrophobic insulating layer, so that its surface tension changes, driving the non-polar liquid to shrink. Specifically, when the applied voltage exceeds the threshold voltage, the non-polar liquid will break and shrink, so that the pixel grid is opened to realize the electro-wetting optical switch; and the size of the non-polar fluid switch can be controlled by applying different voltages, so as to control the light flux passing through each pixel grid unit of the device.

[0121] The electro-wetting display device of this embodiment adopts the CMY subtractive color mixing display principle, specifically as Figure 12(01, 02, and 03 in the figure respectively represent magenta, cyan, and yellow), and the three inks are arranged in the order of "yellow - magenta - cyan" from top to bottom according to the characteristics of the visual sensitivity of the human eye; when all three layers of ink are closed (i.e., the ink is in a spread state), the device will display as dark purple; when all three layers of ink are open (i.e., the ink is in a contracted state), the device will display the color of the substrate, showing a white and slightly transparent color; when the yellow ink layer is open (i.e., the non-polar liquid I 421 is in a contracted state), the device will display blue, and when the magenta ink layer is open (i.e., the non-polar liquid II 422 is in a contracted state), the device will display green; when the cyan ink layer is open (i.e., the second non-polar liquid 52 is in a contracted state), the device will display red; when the yellow ink layer and the magenta ink layer are open (i.e., the non-polar liquid I 421 and the non-polar liquid II 422 are in a contracted state), the device displays cyan; when the magenta ink layer and the cyan ink layer are open (i.e., the non-polar liquid II 422 and the second non-polar liquid 52 are in a contracted state), the device displays magenta.

[0122] The above common cavity type color electro-wetting display device adopts a common cavity structure to set up common cavity display units, and even a double-sided conductive substrate can be introduced to construct a common cavity type stacked electro-wetting display device, which simplifies the substrate structure of the device. And due to the reduction in thickness, its color bleeding area is greatly reduced; also, due to the improvement of the structure, the stereoscopic visual sharpness of the display device is reduced.

[0123] Specifically, the inventors respectively Figure 1 for the traditional full-color electro-wetting display device shown in Figure 2 and the color bleeding areas of the common cavity type color electro-wetting display device shown in Figure 1 were detected. The full-color electro-wetting display device shown in Figure 2 and the common cavity type color electro-wetting display device shown in Figure 2 are substantially the same in other aspects (such as the arrangement order of the inks, the selection of materials for similar structures, and the thickness, etc.) except for the following structural differences: Figure 1 The device shown in

[0124] includes a combination of a two-color common cavity unit structure and a monochromatic display unit. The middle second support component uses a double-sided conductive substrate, and a conductive layer is provided at the end of the pixel wall on the side of the second support component facing the first support component; while Figure 13 the traditional full-color electro-wetting display device shown in Figure 13 is stacked by three independent monochromatic display elements. Figure 2 Figure 1 The obtained color bleeding area test results are as shown in Figure 2 Figure 2The width of the crosstalk region of the electro-wetting display device shown can be reduced from Figure 1 the width of the crosstalk region of the traditional full-color electro-wetting display device shown, which is 1.8 mm, to 0.6 mm. In addition, through the test of the stereoscopic vision sharpness of the two electro-wetting display devices, it is found that compared with Figure 1 the traditional full-color electro-wetting display device shown, Figure 2 in the co-cavity color electro-wetting display device shown, the stereoscopic vision sharpness of the MY two-layer ink is reduced by 94.8%, and the stereoscopic vision sharpness of the YC two-layer ink is reduced by 69.5%.

[0125] Figure 2 The preparation of the co-cavity color electro-wetting display device shown can be referred to Figures 14 to 16 shown, and specifically includes:

[0126] (1) Preparation of device structure components, as Figure 14 shown, including:

[0127] Preparing the first support component, the second support component and the third support component:

[0128] Specifically, first take the first conductive substrate (i.e., single-sided ITO conductive glass ①), the second conductive substrate (i.e., double-sided ITO conductive glass ②) and the third conductive substrate (i.e., single-sided ITO conductive glass ③); on one side of the first conductive substrate, prepare the first dielectric layer, the first hydrophobic insulating layer and the first pixel wall in sequence, and the first pixel wall encloses the first pixel grid; on one side of the second conductive substrate, prepare the second dielectric layer, the second hydrophobic insulating layer and the second pixel wall in sequence, and the second pixel wall encloses the second pixel grid; on one side of the third conductive substrate, prepare the third dielectric layer, the third hydrophobic insulating layer and the third pixel wall in sequence, and the third pixel wall encloses the third pixel grid.

[0129] Among them, each dielectric layer can be prepared by spin coating. Specifically, a photoresist material is used, which is spin coated on the corresponding conductive substrate and then cured by ultraviolet light (UV); among them, after the photoresist material is spin coated, before the curing treatment, a hot plate can be used for hard baking; in addition, before spin coating the dielectric layer, the conductive substrate can be cleaned, and specifically, ultrasonic cleaning can be used.

[0130] Each hydrophobic insulating layer can also be prepared by spin coating. Its material can be the fluoropolymer material AF1600X of Chemours Company, USA. Specifically, the fluoropolymer material is spin coated on the corresponding dielectric layer / conductive substrate, baked and cured after film formation, and oxygen plasma modification is carried out by using a reactive ion etching machine to change the hydrophilicity of the fluoropolymer. The hydrophobic insulating layer changes from hydrophobic to hydrophilic to obtain a hydrophilic insulating layer.

[0131] The preparation of each pixel wall can be achieved by spin-coating a photoresist material to form a film, followed by exposure and development to obtain a pixel grid array structure. After DESCUM cleaning the residual photoresist and secondary development, it is placed in a dust-free oven for high-temperature reflux to restore the hydrophobicity of the insulating layer. Additionally, using the insulating pixel wall prepared on the second conductive substrate (i.e., double-sided ITO conductive glass) as the substrate, a conductive layer is prepared at the end facing away from the hydrophobic insulating layer, thereby constructing the second pixel wall. As Figure 15 shown, for the preparation of the conductive layer, the lithography technique using conductive photoresist can be selected. Specifically, first spin-coat ordinary / conductive photoresist on the insulating pixel wall substrate, then add a mask for lithography, and then bake and cure to obtain it; alternatively, for the preparation of the conductive layer at the end of the insulating pixel wall substrate, printing processes such as coating and imprinting, inkjet printing (or fluid printing) can be used; or, a stamping metal film structure or selective coating can be used to prepare the conductive layer; in addition, other methods can also be used to prepare the conductive layer, and no limitation is made in this regard.

[0132] (II) Fluid filling and device assembly:

[0133] In the filling and encapsulation stage, following the filling order from top to bottom, first fill the common cavity display unit. As Figure 16 shown, using the inkjet printing filling method, first fill non-polar liquid I (i.e., yellow ink) into the first pixel grid of the first support component, and then place the first support component filled with non-polar liquid I on the cold plate of the condensation table (the temperature is set lower than the freezing point of non-polar liquid I) for freezing treatment to cause the phase change and solidification of non-polar liquid I; then use a packaging glue frame or Dispenser dispensing technology to prepare a sealing glue frame and place it on the condensation table for bonding. In the process of preparing the sealing glue frame, an ultraviolet curable glue (i.e., UV glue), such as XNR5570 from Nagase Chemtex Corporation, can be used and cured by irradiating with ultraviolet light at an intensity of 200 mW for 10 minutes. Then, a similar method can be used to fill non-polar liquid II (i.e., magenta ink) into the second pixel grid of the second support component and perform freezing treatment to cause the phase change and solidification of non-polar liquid II; then cover the conductive polar liquid on the magenta ink layer, invert the first support component filled with solidified non-polar liquid I, and align and bond it with the second support component. Among them, heavy pressure curing or ultraviolet curing encapsulation can be selected according to the characteristics of the packaging glue frame. In this embodiment, ultraviolet curing encapsulation can be used to form a two-color common cavity display unit.

[0134] During the assembly process of the above dual-color common cavity display unit, by inverting a support component to align and bond it with another support component, since the pixel grid of the inverted support component is filled with a non-polar liquid, freezing treatment is performed to cause its phase change and solidification, which is beneficial for realizing the inverted assembly operation. Based on this, in some embodiments, only one support component filled with non-polar liquid can be placed on a cooling table for freezing treatment to cause the non-polar liquid to undergo phase change and solidification, without performing freezing treatment on the non-polar liquid filled on the other support component. During assembly and encapsulation, the support component filled with solidified non-polar liquid is inverted and aligned and bonded with the other support component, so that the inverted assembly operation in the construction of the common cavity display unit can also be realized. In addition, when filling the conductive polar liquid, the conductive polar liquid is generally filled on the support component that does not need to be inverted, so as to facilitate the implementation of subsequent inverted encapsulation operations.

[0135] After completing the filling and assembly of the above dual-color common cavity display unit, apply a sealing UV glue frame on the surface of the second conductive substrate of the second support component facing away from the first support component for standby; use the inkjet printing filling method to fill the second non-polar liquid (i.e., cyan ink) into the third pixel grid of the third support component. Then, perform freezing treatment on the third support component filled with the second non-polar liquid to cause the non-polar liquid Ⅰ to undergo phase change and solidification. Then, cover the polar liquid on the cyan ink layer, invert the dual-color common cavity display unit (or the second support component), and set the second support component facing the third support component, perform alignment and bonding encapsulation, and place it in an ultraviolet light environment for curing to form a monochromatic display unit, and obtain a common cavity type color electro-wetting display device, that is, a common cavity type CMY stacked color electro-wetting display device.

[0136] The above preparation process transforms from the traditional manufacturing process of independent display unit devices and the compound OCA optical glue bonding process to the CMY top-down integrated manufacturing technology. The proposed top-down filling and bonding sequence conforms to the actual inkjet printing technology and is reasonably designed; moreover, by constructing a conductive layer at the end of the pixel wall of the common cavity structure facing away from the corresponding hydrophobic insulating layer, the process difficulty of the device can be reduced, the yield rate of the device can be effectively improved, and the stability of the device can be increased.

[0137] In some embodiments, during the construction process of the above monochromatic display unit, the second non-polar liquid may not be subjected to freezing treatment, that is, the second non-polar liquid is kept in a liquid state, and during the encapsulation process, the dual-color common cavity display unit is inverted and aligned and bonded with the third support component filled with the second non-polar liquid and the polar liquid.

[0138] The preparation of the above-mentioned other common cavity type color electro-wetting display device can be adjusted according to the specific structure of the target device. For example, if the target common cavity type color electro-wetting display device only includes one layer of dual-color common cavity display units, the construction steps of the above-mentioned monochromatic display units can be cancelled; if a certain layer of the device structure is cancelled, the preparation process of that layer will be cancelled correspondingly. For example, if the dielectric layer is cancelled between the conductive substrate and the hydrophobic insulating layer, the preparation of the dielectric layer will be cancelled during the device preparation process. Another example is that if the target common cavity type color electro-wetting display device includes two layers of dual-color common cavity display units arranged in a stack, its preparation can be adjusted as follows on the basis of the preparation method of the common cavity type color electro-wetting display device shown above Figure 2 :

[0139] First, when preparing the second support component, a second dielectric layer, a second hydrophobic insulating layer, and a second pixel wall can be sequentially prepared on one side of the second conductive substrate, and the second pixel wall encloses a second pixel grid; then, a fourth dielectric layer, a fourth hydrophobic insulating layer, and a fourth pixel wall are sequentially prepared on the other side of the second conductive substrate facing away from the second dielectric layer, and the fourth pixel wall encloses a fourth pixel grid; the preparation of the first support component and the third support component remains unchanged.

[0140] Then, the dual-color common cavity display units can be constructed in a similar method as above, and the construction of the above-mentioned monochromatic display units can also be adjusted to the construction of common cavity display units. Specifically, a third non-polar liquid can be filled into the fourth pixel grid of the second support component, and a second non-polar liquid can be filled into the third pixel grid of the third support component; then, the second support component (or the common cavity display unit structure) filled with the third non-polar liquid and / or the third support component filled with the second non-polar liquid can be placed on a condensation table for freezing treatment to cause the phase change and solidification of the non-polar liquid; one of the support components filled with the solidified non-polar liquid is inverted, and a conductive polar liquid is covered on the non-polar liquid of the other support component, and then alignment bonding and curing are carried out, so as to construct a common cavity display unit between the second support component and the third support component.

[0141] The above-mentioned embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A common cavity type color electro-wetting display device, characterized in that Comprising: A first support component and a second support component, with a first sealing cavity formed between the first support component and the second support component; The first support component includes a first conductive substrate, a first hydrophobic insulating layer, and a first pixel wall sequentially arranged in a direction towards the second support component, and the first pixel wall encloses a first pixel cell; The second support component includes a second conductive substrate, a second hydrophobic insulating layer, and a second pixel wall sequentially arranged in a direction towards the first support component, and the second pixel wall encloses a second pixel cell; The first sealing cavity is filled with immiscible conductive polar liquid and a first non-polar liquid. The first non-polar liquid includes non-polar liquid Ⅰ and non-polar liquid Ⅱ of different colors. The non-polar liquid Ⅰ is filled in the first pixel cell, and the non-polar liquid Ⅱ is filled in the second pixel cell; the conductive polar liquid is electrically connected to the first conductive substrate and the second conductive substrate respectively.

2. The co-cavity color electro-wetting display device according to claim 1, characterized in that, The first pixel wall and / or the second pixel wall is a conductive pixel wall; Preferably, the first pixel wall includes a first insulating matrix and a first conductive layer. The first insulating matrix is disposed on the surface of the first hydrophobic insulating layer, and the first conductive layer is disposed at an end of the first insulating matrix facing away from the first hydrophobic insulating layer; and / or, the second pixel wall includes a second insulating matrix and a second conductive layer. The second insulating matrix is disposed on the surface of the second hydrophobic insulating layer, and the second conductive layer is disposed at an end of the second insulating matrix facing away from the second hydrophobic insulating layer.

3. The co-cavity color electro-wetting display device according to claim 1 or 2, characterized in that, The second conductive substrate is a double-sided conductive substrate; The co-cavity type color electro-wetting display device further includes a third support component, with a second sealing cavity formed between the third support component and the second support component. The third support component includes a third conductive substrate, a third hydrophobic insulating layer, and a third pixel wall sequentially arranged in a direction towards the second support component, and the third pixel wall encloses a third pixel cell; the second sealing cavity is filled with immiscible polar liquid and a second non-polar liquid, and the second non-polar liquid is filled in the third pixel cell.

4. The co-cavity color electro-wetting display device according to claim 3, wherein The color of the second non-polar liquid is different from the colors of the non-polar liquid Ⅰ and the non-polar liquid Ⅱ; Preferably, the non-polar liquid Ⅰ, the non-polar liquid Ⅱ, and the second non-polar liquid are each independently selected from any one of different color inks of yellow ink, magenta ink, and cyan ink.

5. The co-cavity color electro-wetting display device according to claim 3, wherein Satisfying at least one of the following conditions: A first dielectric layer is provided between the first conductive substrate and the first hydrophobic insulating layer; A second dielectric layer is provided between the second conductive substrate and the second hydrophobic insulating layer; A third dielectric layer is provided between the third conductive substrate and the third hydrophobic insulating layer; The first support component is a transmissive support component, and the third support component is a reflective support component; or, the first support component is a reflective support component, and the third support component is a transmissive support component.

6. The co-cavity color electro-wetting display device according to claim 3, characterized in that, The second support component further includes a fourth hydrophobic insulating layer and a fourth pixel wall that are sequentially arranged on a side of the second conductive substrate facing away from the second hydrophobic insulating layer and along the direction towards the third support component, and the fourth pixel wall encloses a fourth pixel cell; A third non-polar liquid immiscible with the polar liquid is further filled in the second sealing cavity, and the third non-polar liquid is filled in the fourth pixel cell; the polar liquid is a conductive polar liquid, and the polar liquid is electrically connected to the second conductive substrate and the third conductive substrate respectively.

7. A method for manufacturing the co-cavity color electro-wetting display device according to any one of claims 1 to 6, characterized in that, It includes the following steps: Prepare the first support component and the second support component; Fill non-polar liquid I into the first pixel cell of the first support component, and fill non-polar liquid II into the second pixel cell of the second support component; Perform a freezing treatment on the non-polar liquid I to cause its phase change and solidification, and / or perform a freezing treatment on the non-polar liquid II to cause its phase change and solidification; Fill the conductive polar liquid; then invert the first support component filled with the solidified non-polar liquid I and align and bond it with the second support component, or invert the second support component filled with the solidified non-polar liquid II and align and bond it with the first support component.

8. The manufacturing method of the common cavity type color electro-wetting display device according to claim 7, characterized in that, The second conductive substrate in the second support component is a double-sided conductive substrate; The preparation method further includes: Prepare the third support component, fill a second non-polar liquid into the third pixel cell of the third support component; then fill the polar liquid; and then align and bond the third support component filled with the second non-polar liquid with a surface of the second support component facing away from the first support component.

9. The preparation method of the co-cavity type color electro-wetting display device according to claim 8, characterized in that, The second support component includes a fourth hydrophobic insulating layer and a fourth pixel wall that are sequentially arranged on a side of the second conductive substrate facing away from the second hydrophobic insulating layer, and the fourth pixel wall encloses a fourth pixel cell; The preparation method further includes: Fill a third non-polar liquid into the fourth pixel cell of the second support component; Perform a freezing treatment on the second non-polar liquid to cause its phase change and solidification, and / or perform a freezing treatment on the third non-polar liquid to cause its phase change and solidification; Then fill the polar liquid; and then invert the third support component filled with the solidified second non-polar liquid and align and bond it with the second support component, or invert the second support component filled with the solidified third non-polar liquid and align and bond it with the third support component.

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