Manufacturing method of color electronic paper, color electronic paper and color display device

Abstract

The invention discloses a manufacturing method of color electronic paper, the color electronic paper and a color display device. The manufacturing method of the color electronic paper comprises the following steps: manufacturing a driving layer, wherein the driving layer comprises a plurality of driving pixel units; manufacturing a capsule filter layer on the surface of the driving layer; the capsule light filtering layer comprises a plurality of capsule light filtering units; the capsule filtering units are in one-to-one correspondence with the pixel electrodes; each capsule light filtering unit comprises a color photoresist and a plurality of black and white electronic ink capsules filled in the color photoresist, and the plurality of capsule light filtering units form an R-color pattern, a G-color pattern and a B-color pattern; manufacturing a transparent electrode layer on the surface of the capsule filter layer; and manufacturing a transparent substrate or a waterproof layer on the surface of the transparent electrode layer. The color filter layer and the electronic ink capsule layer are combined into a whole, the total thickness of the color filter layer and the electronic ink capsule layer is reduced, the color cast phenomenon is avoided, and the display device has the advantages of being small in light resistance and high in segregation degree.

Description

Technical Field

[0001] The present invention relates to the technical field of electrophoretic display, and in particular to a method for manufacturing color electronic paper, color electronic paper and a color display device. Background Art

[0002] Electronic paper has the advantages of repeated rewriting and low energy consumption, and is widely used in electronic tags, billboards, electronic readers and other application fields. Early electronic paper displays could only display black and white, and how to make electronic paper displays colorful is a problem that people have been working hard to solve.

[0003] There are two ways to make color electronic paper display modules:

[0004] 1. Covering the black and white electronic paper with a color filter. The colorization of traditional encapsulated electronic paper is achieved by laminating an electronic ink film on top of the TFT drive array base plate, and then laminating or printing a color filter on top of the electronic ink film. The structure and production method achieve the purpose of colorization. Electronic ink capsules are reflective display technology. The traditional electronic ink capsule colorization is that the ambient light penetrates the color filter layer and then passes through the electronic ink capsule layer. After reflection, it penetrates the color filter layer again, which causes light loss twice and is prone to color deviation problems. Therefore, when covering the black and white electronic paper with a color filter structure, the thickness between the filter layer and the electronic ink layer is very high, and there is a color deviation phenomenon. Therefore, the photoresist cannot be made smaller, resulting in poor resolution;

[0005] Second, the electronic paper capsule contains colored particles of various colors. The disadvantages of this structure are: the preparation process is complicated, and currently only three-color electronic paper with black and white plus another color (such as black and white and red or black and white and blue) is available, which still cannot quickly and effectively display complex color images, and mass production is difficult.

[0006] Since the multi-colored charged particles under development cannot currently display complex color images, color e-paper can only be prepared by filtering. The traditional coating method causes color deviation due to the high thickness between the filter and the capsule, which makes it impossible to make the photoresist smaller, resulting in poor resolution.

[0007] At the same time, the above electronic paper manufacturing methods cannot avoid the problem of low material utilization rate caused by electronic paper cutting, and cannot effectively reduce costs.

[0008] In order to avoid the problem of low material utilization and inability to produce large-size display devices caused by traditional cutting methods, some R&D personnel started with the substrate and developed a matching display module manufacturing method:

[0009] One method is to directly apply frame glue around the TFT driving backplane and cure it, then cover the frame glue with a transparent conductive layer, form a box, and then use capillaries to inject fluid microcapsule electrophoretic display materials into the box, and finally cure it to obtain an electronic paper display device.

[0010] Another way is to apply a gasket frame on the driver backplane, then use a glue dispenser to apply the electronic ink capsule, dry and solidify it, press the upper transparent electrode after applying the conductive silver paste, and then use laser cutting to expose the IC bonding position. After bonding, glue is dispensed and packaged to make an electronic paper display module.

[0011] The above method is a great improvement over the traditional method, but the process is complicated. Although the desired pattern can be obtained by laser cutting on the base plate after lamination, it is difficult to cut without damaging the circuit. Summary of the invention

[0012] The present invention provides a method for manufacturing color electronic paper, color electronic paper and a color display device, which combine a color filter layer and an electronic ink capsule layer into one, thereby reducing the total thickness of the color filter layer and the electronic ink capsule layer, avoiding the occurrence of color deviation, and having the advantages of small light resistance and high segregation, thereby solving the problem of low resolution of existing color electronic paper.

[0013] The purpose of the present invention is achieved through the following technical solutions:

[0014] One embodiment of the present invention provides a method for manufacturing a color electronic paper, comprising the following steps:

[0015] Manufacturing a driving layer, wherein the driving layer includes a plurality of driving pixel units;

[0016] A capsule filter layer is fabricated on the surface of the driving layer; the capsule filter layer comprises a plurality of capsule filter units; each capsule filter unit corresponds to a pixel electrode of each driving pixel unit one by one; the capsule filter unit comprises a color photoresist and a plurality of black and white electronic ink capsules filled in the color photoresist; the plurality of capsule filter units constitute a three-color pattern of R, G and B;

[0017] Making a transparent electrode layer on the surface of the capsule filter layer;

[0018] A transparent substrate or a waterproof layer is manufactured on the surface of the transparent electrode layer.

[0019] Another embodiment of the present invention provides a method for manufacturing a color electronic paper, comprising the following steps:

[0020] Making a transparent electrode layer on the surface of a transparent substrate;

[0021] A capsule filter layer is fabricated on the surface of the transparent electrode layer; the capsule filter layer comprises a plurality of capsule filter units; the capsule filter units comprise a color photoresist and a plurality of black and white electronic ink capsules filled in the color photoresist; the plurality of capsule filter units form a three-color pattern of R, G and B;

[0022] The capsule filter layer is attached to the surface of the driving layer, the driving layer comprises a plurality of driving pixel units, and each capsule filter unit corresponds to a pixel electrode of each driving pixel unit one by one.

[0023] In some embodiments, the black and white electronic ink capsule includes an electrophoretic fluid and black pigment particles and white pigment particles disposed in the electrophoretic fluid.

[0024] In some embodiments, the preparation of the capsule filter layer is specifically:

[0025] The black and white electronic ink capsules are mixed with red photoresist, green photoresist and blue photoresist respectively to obtain red capsule filter coating, green capsule filter coating and blue capsule filter coating respectively; the red capsule filter coating, green capsule filter coating and blue capsule filter coating are respectively coated, photolithography patterned and cured to obtain a plurality of red capsule filter units, a plurality of green capsule filter units and a plurality of blue capsule filter units; the plurality of red capsule filter units, the plurality of green capsule filter units and the plurality of blue capsule filter units constitute a three-color pattern of R, G and B.

[0026] In some embodiments, during the process of manufacturing the capsule filter layer, the preparation process of the red capsule filter unit includes:

[0027] Mixing the red photoresist with the black and white electronic ink capsules to form a red capsule light filter coating;

[0028] Applying the red capsule filter coating on the driving layer or the transparent electrode layer to obtain a red capsule filter coating;

[0029] performing patterning on the red capsule filter coating to obtain a patterned red capsule filter coating;

[0030] baking the patterned red capsule filter coating at a temperature greater than or equal to 60 degrees Celsius to solidify the patterned red capsule filter coating to obtain a red capsule filter unit;

[0031] The patterning process is specifically as follows: covering the red capsule filter coating with a first mask, the first mask having a light-transmitting area and a light-impermeable area, the light-transmitting area covering a position where the red capsule filter coating needs to be retained, and the light-impermeable area covering a position where the red capsule filter coating needs to be removed, exposing the red capsule filter coating with ultraviolet light, and then removing the unexposed red capsule filter coating with a developer, so as to pattern the red capsule filter coating;

[0032] The patterning process may be: covering the red capsule filter coating with a first mask, the first mask having a light-transmitting area and a light-opaque area, the light-opaque area covering a position where the red capsule filter coating needs to be retained, and the light-transmitting area covering a position where the red capsule filter coating needs to be removed, exposing the red capsule filter coating in the light-transmitting area with ultraviolet light, and then using a developer to remove the exposed red capsule filter coating, thereby patterning the red capsule filter coating.

[0033] In some embodiments, during the process of manufacturing the capsule filter layer, the preparation process of the green capsule filter unit includes:

[0034] Mixing the green photoresist with the black and white electronic ink capsules to form a green capsule light filter coating;

[0035] Applying the green capsule filter coating on the driving layer or the transparent electrode layer to obtain a green capsule filter coating;

[0036] The green capsule filter coating is patterned to obtain a patterned green capsule:

[0037] baking the patterned green capsule filter coating at a temperature greater than or equal to 60 degrees Celsius to solidify the patterned green capsule filter coating to obtain a green capsule filter unit;

[0038] The patterning process is specifically as follows: covering the green capsule filter coating with a first mask, the first mask having a light-transmitting area and a light-impermeable area, the light-transmitting area covering a position where the green capsule filter coating needs to be retained, and the light-impermeable area covering a position where the green capsule filter coating needs to be removed, exposing the green capsule filter coating with ultraviolet light, and then removing the unexposed green capsule filter coating with a developer, so as to pattern the green capsule filter coating;

[0039] The patterning process may be: covering the green capsule filter coating with a first photomask, the first photomask having a light-transmitting area and a light-impermeable area, the light-impermeable area covering a position where the green capsule filter coating needs to be retained, and the light-transmitting area covering a position where the green capsule filter coating needs to be removed, exposing the green capsule filter coating in the light-transmitting area with ultraviolet light, and then removing the exposed green capsule filter coating with a developer, thereby patterning the green capsule filter coating.

[0040] In some embodiments, during the process of manufacturing the capsule filter layer, the preparation process of the blue capsule filter unit includes:

[0041] Mixing the blue photoresist with the black and white electronic ink capsules to form a blue capsule light filter coating;

[0042] Applying the blue capsule filter coating on the driving layer or the transparent electrode layer to obtain a blue capsule filter coating;

[0043] The blue capsule filter coating is patterned to obtain a patterned blue capsule filter coating:

[0044] baking the patterned blue capsule filter coating at a temperature greater than or equal to 60 degrees Celsius to solidify the patterned blue capsule filter coating to obtain a blue capsule filter unit;

[0045] The patterning process is specifically as follows: covering the blue capsule filter coating with a first mask, the first mask having a light-transmitting area and a light-impermeable area, the light-transmitting area covering a position where the blue capsule filter coating needs to be retained, and the light-impermeable area covering a position where the blue capsule filter coating needs to be removed, exposing the blue capsule filter coating with ultraviolet light, and then removing the unexposed blue capsule filter coating with a developer, so as to pattern the blue capsule filter coating;

[0046] The patterning process may be: covering the blue capsule filter coating with a first light mask, the first light mask having a light-transmitting area and a light-opaque area, the light-opaque area covering a position where the blue capsule filter coating needs to be retained, and the light-transmitting area covering a position where the blue capsule filter coating needs to be removed, exposing the blue capsule filter coating in the light-transmitting area with ultraviolet light, and then using a developer to remove the exposed blue capsule filter coating, thereby patterning the blue capsule filter coating.

[0047] In some embodiments, before manufacturing the capsule filter layer, a black matrix layer is first manufactured on the driving layer, wherein the black matrix layer includes matrix stripes and a first region, a second region, and a third region isolated by the matrix stripes;

[0048] The red capsule filter unit is arranged in the first area of ​​the black matrix layer, the green capsule filter unit is arranged in the second area of ​​the black matrix layer, and the blue capsule filter unit is arranged in the third area of ​​the black matrix layer. The red capsule filter unit, the green capsule filter unit and the blue capsule filter unit are isolated from each other by the matrix stripes.

[0049] One embodiment of the present invention provides a color electronic paper, comprising:

[0050] A driving layer, wherein the driving layer includes a plurality of driving pixel units;

[0051] A capsule filter layer is arranged on the surface of the driving layer, and the capsule filter layer includes a plurality of capsule filter units; each capsule filter unit corresponds to a pixel electrode of each driving pixel unit one by one; the capsule filter unit includes a color photoresist and a plurality of black and white electronic ink capsules filled in the color photoresist, and the plurality of capsule filter units form a three-color pattern of R, G, and B;

[0052] A transparent electrode layer is arranged on the surface of the capsule filter layer; and

[0053] The protective layer is arranged on the surface of the transparent electrode layer.

[0054] In some embodiments, the protective layer is a transparent substrate or a waterproof layer.

[0055] In some embodiments, the color electronic paper further includes a bonding layer, and the driving layer and the color filter layer are bonded together through the bonding layer.

[0056] One embodiment of the present invention provides a color display module, including the color electronic paper.

[0057] In some embodiments, the packaging process of the color display module is as follows: a circle of edge sealing glue is applied around the periphery of the color electronic paper and cured, and finally a protective layer is affixed and hot-pressed to complete the packaging of the color display module.

[0058] Compared with the prior art, the color electronic paper and the manufacturing method thereof provided by the embodiments of the present invention have the following advantages and beneficial effects:

[0059] (1) In the color electronic paper of the present invention, the capsule filter layer includes a plurality of capsule filter units; the capsule filter units include color photoresist and a plurality of black and white electronic ink capsules filled in the color photoresist, and the color filter layer and the electronic ink capsule layer are combined into one. Compared with the conventional method of laminating the filter and the microcapsule layer together, the total thickness of the filter layer and the capsule layer can be made relatively small, thereby solving the problem of color deviation caused by the conventional total thickness of the filter and the capsule layer being too large, and thus making the prepared color electronic paper have better resolution; and the loss of light penetration and reflection can be greatly reduced, which can improve the effect of color display.

[0060] (2) The traditional method of colorizing electronic paper requires high-precision lamination of color filters or high-precision alignment and printing of color filter layers on the electronic ink layer, which has a limit to high-resolution colorization production. The method for producing color electronic paper of the present invention, by mixing a plurality of black and white electronic ink capsules of color photoresist into a coating, adopts a photolithography process to produce a capsule filter layer, which simplifies the process steps on the one hand; on the other hand, due to the maturity of photolithography materials and equipment, nanometer-level patterning technology has been achieved, which far exceeds the traditional micron-level lamination or printing of color filter layer technology, so that the color electronic paper produced by the present invention has high resolution.

[0061] (3) The method for making colored electronic paper of the present invention is to mix a plurality of black and white electronic ink capsules of colored photoresist into a coating, print the coating on a substrate by coating, and then use a photolithography process to make a capsule filter layer, thereby avoiding the problem of low material utilization rate caused by cutting the electronic paper in the traditional way, and there is no need to build a retaining wall, thereby reducing the difficulty of the process. The capsule filter layer can also be made on the transparent electrode layer, cut into the same size as the ink layer, and bonded to the TFT array bottom plate by alignment and bonding. The capsule filter unit is aligned with the lower driving pixel unit up and down. When packaging, a circle of edge sealing glue is dotted around the colored electronic paper and cured, and finally a protective layer is affixed and hot pressed to complete the packaging of the color display module. The present invention simplifies the production process of colored electronic paper and the packaging process of the color display module, thereby reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 is a schematic flow chart of a method for manufacturing color electronic paper provided by one embodiment of the present invention;

[0063] Figure 2 yes Figure 1 The structural diagram of the driver layer made in ;

[0064] Figure 3 yes Figure 1 Schematic diagram of the structure of the capsule filter layer made in;

[0065] Figure 4 yes Figure 1 A schematic diagram of the structure of the transparent electrode layer produced in FIG.

[0066] Figure 5 yes Figure 1 A schematic diagram of the structure of the transparent substrate produced in the process;

[0067] Figure 6 is a flow chart of a method for manufacturing color electronic paper provided by another embodiment of the present invention;

[0068] Figure 7 yes Figure 6 A schematic diagram of the structure of the transparent electrode layer produced in FIG.

[0069] Figure 8 yes Figure 6 Schematic diagram of the structure of the capsule filter layer made in;

[0070] Fig. 9 yes Figure 6 A schematic diagram of the structure after the capsule filter layer is attached to the surface of the driving layer;

[0071] Fig.10 For production Figure 3 Schematic diagram of the first step of the red capsule filter unit;

[0072] Fig.11 For production Figure 3 Schematic diagram of the second step of the red capsule filter unit;

[0073] Fig.12 For production Figure 3 Schematic diagram of the third step of the red capsule filter unit;

[0074] Fig.13 For production Figure 3 Schematic diagram of the first step of the green capsule filter unit;

[0075] Fig.14 For production Figure 3 Schematic diagram of the second step of the green capsule filter unit;

[0076] Fig.15 For production Figure 3 Schematic diagram of the third step of the green capsule filter unit;

[0077] Fig.16 For production Figure 3 Schematic diagram of the first step of the blue capsule filter unit;

[0078] Fig.17 For production Figure 3 Schematic diagram of the second step of the blue capsule filter unit;

[0079] Fig.18 For production Figure 3 Schematic diagram of the third step of the blue capsule filter unit;

[0080] Fig.19 Another embodiment provides a method for producing Figure 3 Schematic diagram of the second step of the red capsule filter unit;

[0081] Fig. 20 Another embodiment provides a method for producing Figure 3 Schematic diagram of the second step of the green capsule filter unit;

[0082] Fig.21 Another embodiment provides a method for producing Figure 3 Schematic diagram of the second step of the green capsule filter unit;

[0083] Fig. 22 A schematic diagram of the structure of a black matrix layer manufactured in one embodiment of the present invention;

[0084] Fig.23 A schematic cross-sectional view of a color electronic paper structure provided by one embodiment of the present invention;

[0085] Fig.24 A schematic cross-sectional view of a color electronic paper structure provided in another embodiment of the present invention. DETAILED DESCRIPTION

[0086] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0087] See also Figure 1 One embodiment of the present invention provides a method for manufacturing a color electronic paper, comprising the following steps:

[0088] Manufacturing a driving layer, wherein the driving layer includes a plurality of driving pixel units;

[0089] A capsule filter layer is fabricated on the surface of the driving layer; the capsule filter layer comprises a plurality of capsule filter units; each capsule filter unit corresponds to a pixel electrode of each driving pixel unit one by one; the capsule filter unit comprises a color photoresist and a plurality of black and white electronic ink capsules filled in the color photoresist, and the plurality of capsule filter units constitute a three-color pattern of R, G and B;

[0090] Making a transparent electrode layer on the surface of the capsule filter layer;

[0091] A transparent substrate or a waterproof layer is manufactured on the surface of the transparent electrode layer.

[0092] In the color electronic paper manufacturing method provided in the above embodiment, the capsule filter layer includes a plurality of capsule filter units; the capsule filter unit includes a color photoresist and a plurality of black and white electronic ink capsules filled in the color photoresist, and the color filter layer and the electronic ink capsule layer are combined into one. Compared with the traditional method of laminating the filter and the microcapsule layer together, the thickness of the filter layer and the capsule layer can be made relatively small, thereby solving the problem of color deviation caused by the total thickness of the traditional filter and the capsule layer being too large, and thus making the prepared color electronic paper have better resolution; and greatly reducing the loss of light penetration and reflection, which can improve the effect of color display.

[0093] The method for manufacturing the color electronic paper is described in detail below using a specific embodiment.

[0094] Please also see Figure 2 , manufacturing a driving layer 110. The driving layer 110 includes a plurality of driving pixel units, each of which has a pixel electrode 111. In this embodiment, the driving layer 110 is a TFT driving array.

[0095] Please also see Figure 3, a capsule filter layer 120 is fabricated on the surface of the driving layer 110. The capsule filter layer 120 includes a plurality of capsule filter units, each of which corresponds to a pixel electrode 111 of each driving pixel unit. The capsule filter unit includes a color photoresist 121 and a plurality of black and white electronic ink capsules 122 filled in the color photoresist 121. The color photoresist 121 includes a red photoresist 1211, a green photoresist 1212, and a blue photoresist 1213. The red photoresist 1211 and the black and white electronic ink capsules 122 filled in the red photoresist 1211 form a red capsule filter unit A1. The green photoresist 1212 and the black and white electronic ink capsules 122 filled in the green photoresist 1212 form a green capsule filter unit A2. The blue photoresist 1213 and the black and white electronic ink capsules 122 filled in the blue photoresist 1213 form a blue capsule filter unit A3. The black and white electronic ink capsule 122 includes an electrophoretic liquid 1221 and black and white pigment particles 1222 and 1223 arranged in the electrophoretic liquid 1221, and the charge polarities of the black particles and the white particles are opposite. By controlling the voltage applied to the pixel electrode 111 and the common electrode of the driving pixel unit, the absorption of ambient light by the black particles can be controlled, or the reflection of ambient light by the white particles can be controlled. When the black and white electronic ink capsule 122 reflects ambient light, the display of the electronic paper display can be realized. When the black and white electronic ink capsule 122 absorbs ambient light, the electronic paper display displays black. In this embodiment, the colorization of the color electronic paper is realized by the capsule filter layer 120. When the black and white electronic ink capsule 122 reflects ambient light, the reflected light passes through the capsule filter layer 120, and a colored display can be realized. For example, when the photoresist contained in the capsule filter unit is red photoresist, the reflected light will become red light when it passes through the red filter material; when the photoresist contained in the capsule filter unit is green photoresist, the reflected light will become green light when it passes through the green filter material; when the photoresist contained in the capsule filter unit is blue photoresist, the reflected light will become blue light when it passes through the blue filter material. By mixing red light, green light and blue light, the color electronic paper display pattern can be colored.

[0096] Please also see Figure 4, a transparent electrode layer 130 is made on the surface of the capsule filter layer 120. In this embodiment, the transparent electrode layer 130 is a common electrode. As described above, by controlling the voltage applied to the pixel electrode 111 of the driving pixel unit and the transparent electrode layer 130, the black particles can be controlled to absorb the ambient light, or the white particles can be controlled to reflect the ambient light. In this embodiment, the transparent electrode layer 130 is made of an ITO film. As needed, the transparent electrode layer 130 can also be made of other conductive films.

[0097] Please also see Figure 5 A transparent substrate 140 as a protective layer is prepared on the surface of the transparent electrode layer 130 .

[0098] In other embodiments, the transparent substrate 140 may also be replaced by a waterproof layer.

[0099] It can be understood that the method for manufacturing color electronic paper is not limited to the above embodiments.

[0100] See also Figure 6 Another embodiment of the present invention provides a method for manufacturing a color electronic paper, comprising the following steps:

[0101] Making a transparent electrode layer on the surface of a transparent substrate;

[0102] A capsule filter layer is fabricated on the surface of the transparent electrode layer, wherein the capsule filter layer comprises a plurality of capsule filter units; the capsule filter units comprise color photoresist and a plurality of black and white electronic ink capsules filled in the color photoresist, wherein the plurality of capsule filter units form a three-color pattern of R, G and B; and

[0103] The capsule filter layer is attached to the surface of the driving layer, and the driving layer includes a plurality of driving pixel units; each capsule filter unit corresponds to a pixel electrode of each driving pixel unit one by one.

[0104] Similarly, in the color electronic paper manufacturing method provided in the above embodiment, the capsule filter layer includes a plurality of capsule filter units; the capsule filter unit includes a color photoresist and a plurality of black and white electronic ink capsules filled in the color photoresist, and the color filter layer and the electronic ink capsule layer are combined into one. Compared with the traditional method of laminating the filter and the microcapsule layer together, the thickness of the filter layer and the capsule layer can be made relatively small, thereby solving the problem of color deviation caused by the total thickness of the traditional filter and the capsule layer being too large, and thus making the prepared color electronic paper have better resolution; and greatly reducing the loss of light penetration and reflection, which can improve the effect of color display.

[0105] The method for manufacturing the color electronic paper is described in detail below using a specific embodiment.

[0106] Please also see Figure 7 , a transparent electrode layer 130 is manufactured on the surface of the transparent substrate 140 .

[0107] Please also see Figure 8 , a capsule filter layer 120 is fabricated on the surface of the transparent electrode layer 130. The capsule filter layer 120 includes a plurality of capsule filter units, and the capsule filter units include a color photoresist 121 and a plurality of black and white electronic ink capsules 122 filled in the color photoresist 121. The black and white electronic ink capsules 122 include an electrophoretic liquid 1221 and black and white pigment particles 1222 and 1223 disposed in the electrophoretic liquid 1221, and the charge polarities of the black particles and the white particles are opposite.

[0108] Please also see Fig. 9 The capsule filter layer 120 is attached to the surface of the driving layer 110, and the driving layer 110 includes a plurality of driving pixel units; the red capsule filter unit A1, the green capsule filter unit A2 and the blue capsule filter unit A3 correspond to different pixel electrodes 111 respectively.

[0109] In this embodiment, the red capsule filter unit A1, the green capsule filter unit A2, and the blue capsule filter unit A3 correspond to different pixel electrodes 111 one by one. That is, the projection of the red capsule filter unit A1 on the horizontal plane overlaps or partially overlaps with the projection of the corresponding pixel electrode 111 on the horizontal plane. At this time, by applying a voltage between the corresponding pixel electrode 111 and the transparent electrode layer 130, the black particles in the black and white electronic ink capsule 122 can be controlled to absorb ambient light or the white particles in the black and white electronic ink capsule 122 can be controlled to reflect ambient light. The reflected ambient light passes through the red photoresist 1211, thereby generating red reflected light. Similarly, the projection of the green capsule filter unit A2 on the horizontal plane overlaps or partially overlaps with the projection of the corresponding pixel electrode 111 on the horizontal plane. At this time, by applying a voltage between the corresponding pixel electrode 111 and the transparent electrode layer 130, the black particles in the black and white electronic ink capsule 122 can be controlled to absorb ambient light or the white particles in the black and white electronic ink capsule 122 can be controlled to reflect ambient light. The reflected ambient light passes through the green photoresist 1212, thereby generating green reflected light. Similarly, the projection of the blue capsule filter unit A3 on the horizontal plane overlaps or partially overlaps with the projection of its corresponding pixel electrode 111 on the horizontal plane. At this time, by applying a voltage between the corresponding pixel electrode 111 and the transparent electrode layer 130, the black particles in the black and white electronic ink capsule 122 can be controlled to absorb ambient light or the white particles in the black and white electronic ink capsule 122 can be controlled to reflect ambient light. The reflected ambient light passes through the blue photoresist 1213, thereby generating blue reflected light.

[0110] In some embodiments, during the process of manufacturing the capsule filter layer 120,

[0111] The red photoresist 1211 is mixed with the black and white electronic ink capsules 122 to form a red capsule light filter coating. The green photoresist 1212 is mixed with the black and white electronic ink capsules 122 to form a green capsule light filter coating. The blue photoresist 1213 is mixed with the black and white electronic ink capsules 122 to form a blue capsule light filter coating.

[0112] The red capsule filter coating is coated on the driving layer 110 or the transparent electrode layer 130 to obtain a red capsule filter coating layer, and the red capsule filter coating layer is patterned to form a patterned red capsule filter coating layer. The patterned red capsule filter coating layer is cured to form the red capsule filter unit A1.

[0113] The green capsule filter coating is coated on the driving layer 110 or the transparent electrode layer 130 to obtain a green capsule filter coating layer, and the green capsule filter coating layer is patterned to form a patterned green capsule filter coating layer. The patterned green capsule filter coating layer is cured to form the green capsule filter unit A2.

[0114] The blue capsule filter coating is coated on the driving layer 110 or the transparent electrode layer 130 to obtain a blue capsule filter coating layer, and the blue capsule filter coating layer is patterned to form a patterned blue capsule filter coating layer. The patterned blue capsule filter coating layer is cured to form the blue capsule filter unit A3.

[0115] In some embodiments, the preparation process of the red capsule filter unit A1 includes:

[0116] Mixing the red photoresist with the black and white electronic ink capsules to form a red capsule light filter coating;

[0117] Will see Fig.10 , coating the red capsule filter coating on the driving layer 110 to obtain a red capsule filter coating;

[0118] Please see together Fig.11 , patterning the red capsule filter coating: covering the red capsule filter coating with a first mask 151. The first mask 151 has a light-transmitting area 1511 and a light-impermeable area 1512. The light-transmitting area 1511 covers the position where the red capsule filter coating needs to be retained, and the light-impermeable area 1512 covers the position where the red capsule filter coating needs to be removed, and exposing the red capsule filter coating in the light-transmitting area 1511 with ultraviolet light;

[0119] Please also see Fig.12 , using a developer to remove the unexposed red capsule filter coating, thereby patterning the red capsule filter coating, and baking the patterned red capsule filter coating to solidify the patterned red capsule filter coating to obtain a red capsule filter unit A1.

[0120] It can be understood that the preparation process of the green capsule filter unit A2 is also similar, including:

[0121] Mixing the green photoresist with the black and white electronic ink capsules to form a green capsule light filter coating;

[0122] Please also see Fig.13, coating the green capsule filter coating on the driving layer 110 and the surface of the red capsule filter unit A1 to obtain a green capsule filter coating;

[0123] Please also see Fig.14 , patterning the green capsule filter coating: covering the green capsule filter coating with a second mask 152, wherein the second mask 152 has a light-transmitting area 1521 and a light-impermeable area 1522, wherein the light-transmitting area 1521 covers a position where the green capsule filter coating needs to be retained, and the light-impermeable area 1522 covers a position where the green capsule filter coating needs to be removed, and exposing the green capsule filter coating in the light-transmitting area 1521 to ultraviolet light;

[0124] Please also see Fig.15 , using a developer to remove the unexposed green capsule filter coating, thereby patterning the green capsule filter coating; baking the patterned green capsule filter coating to solidify the patterned green capsule filter coating, thereby obtaining a green capsule filter unit A2.

[0125] It can be understood that the preparation process of the blue capsule filter unit A3 is also similar, including:

[0126] Mixing the blue photoresist with the black and white electronic ink capsules to form a blue capsule light filter coating;

[0127] Please also see Fig.16 , coating the blue capsule filter coating on the driving layer 110 and the surfaces of the red capsule filter unit A1 and the blue capsule filter unit A2 to obtain a blue capsule filter coating;

[0128] Please also see Fig.17 , patterning the blue capsule filter coating: covering the blue capsule filter coating with a third mask 153. The third mask 153 has a light-transmitting area 1531 and a light-impermeable area 1532. The light-transmitting area 1531 covers the position where the blue capsule filter coating needs to be retained, and the light-impermeable area 1532 covers the position where the blue capsule filter coating needs to be removed. Expose the blue capsule filter coating in the light-transmitting area with ultraviolet light;

[0129] Please also see Fig.18 The unexposed blue capsule filter coating is removed by using a developer, so that the blue capsule filter coating is patterned. The patterned blue capsule filter coating is baked to solidify the patterned blue capsule filter coating, thereby obtaining a blue capsule filter unit A3.

[0130] In this embodiment, the red photoresist 1211, the green photoresist 1212 and the blue photoresist 1213 are negative photoresists. The exposed part of the negative photoresist is insoluble in the developer due to cross-linking and curing, while the unexposed part is soluble in the developer, and the opposite pattern of the first mask 151, the second mask 152 and the third mask 153 is copied to the driving layer 110 or the transparent electrode layer 130.

[0131] It is understandable that the photoresist 121 may also be made of positive photoresist. Fig.19 In the process of patterning the red capsule filter coating, the first mask 151 is covered on the red capsule filter coating. The first mask 151 has a light-transmitting area 1511 and a light-impermeable area 1512. Different from the previous embodiment, the light-impermeable area 1512 covers the position where the red capsule filter coating needs to be retained, and the light-transmitting area 1511 covers the position where the red capsule filter coating needs to be removed. The red capsule filter coating in the light-transmitting area 1511 is exposed to ultraviolet light, and then the exposed red capsule filter coating is removed using a developer, so that the red capsule filter coating is patterned.

[0132] Similarly, see Fig. 20 In the process of patterning the green capsule filter coating, a second mask 152 is covered on the green capsule filter coating. The second mask 152 has a light-transmitting area 1521 and a light-impermeable area 1522. Similarly, the light-impermeable area 1522 covers the position where the green capsule filter coating needs to be retained. The light-transmitting area 1521 covers the position where the green capsule filter coating needs to be removed. The green capsule filter coating in the light-transmitting area 1521 is exposed to ultraviolet light, and then the exposed green capsule filter coating is removed using a developer, so that the green capsule filter coating is patterned.

[0133] Similarly, see Fig.21 In the process of patterning the blue capsule filter coating, a third light mask 153 is covered on the blue capsule filter coating. The third light mask 153 has a light-transmitting area 1531 and a light-impermeable area 1532. The light-impermeable area 1532 covers the position where the blue capsule filter coating needs to be retained. The light-transmitting area 1531 covers the position where the blue capsule filter coating needs to be removed. The blue capsule filter coating in the light-transmitting area is exposed to ultraviolet light, and then the exposed blue capsule filter coating is removed using a developer, so that the blue capsule filter coating is patterned.

[0134] In this embodiment, the red photoresist 1211, the green photoresist 1212 and the blue photoresist 1213 are positive photoresists. The exposed part of the positive photoresist undergoes a photochemical reaction and dissolves in a developer, while the unexposed part does not dissolve in the developer and remains on the driving layer 110 or the transparent electrode layer 130, and the same pattern as the first photomask 151, the second photomask 152 and the third photomask 153 is copied to the driving layer 110 or the transparent electrode layer 130.

[0135] In some embodiments, the process of curing the patterned red capsule filter coating is specifically: baking the patterned red capsule filter coating to cure the patterned red capsule filter coating, and the baking temperature is greater than or equal to 60 degrees Celsius.

[0136] Similarly, the process of curing the patterned green capsule filter coating is specifically as follows: baking the patterned green capsule filter coating to cure the patterned green capsule filter coating, and the baking temperature is greater than or equal to 60 degrees Celsius.

[0137] Similarly, the process of curing the patterned blue capsule filter coating is specifically as follows: baking the patterned blue capsule filter coating to cure the patterned blue capsule filter coating, and the baking temperature is greater than or equal to 60 degrees Celsius.

[0138] Through exposure, development and curing processes, the red capsule filter unit A1, the green capsule filter unit A2 and the blue capsule filter unit A3 can be prepared on the driving layer 110 or the transparent electrode layer 130. In this embodiment, the direct mixing of the black and white electronic ink capsule 122 and the photoresist 121 is a photolithography patterning process. Since the current photolithography materials and equipment are relatively mature, the nanometer-level patterning process has been achieved. Therefore, the resolution and resolution of the prepared red capsule filter unit A1, the green capsule filter unit A2 and the blue capsule filter unit A3 far exceed the traditional micron-level lamination or printing color filter layer process.

[0139] In some embodiments, see Fig. 22 Before manufacturing the capsule filter layer 120 , a black matrix layer 160 is first manufactured on the driving layer 110 or the transparent electrode layer 130 . The black matrix layer 160 includes matrix stripes 161 and a first region 162 , a second region 163 and a third region 164 isolated by the matrix stripes 161 .

[0140] The red capsule filter unit A1 is disposed in the first area 162 of the black matrix layer 160. The green capsule filter unit A2 is disposed in the second area 163 of the black matrix layer 160. The blue capsule filter unit A3 is disposed in the third area 164 of the black matrix layer 160. The red capsule filter unit A1, the green capsule filter unit A2, and the blue capsule filter unit A3 are isolated from each other by the matrix stripes 161.

[0141] In this embodiment, the red capsule filter unit A1, the green capsule filter unit A2, and the blue capsule filter unit A3 are isolated from each other by providing the black matrix layer 160 and the matrix stripes 161 of the black matrix layer 160. The red reflected light passing through the red capsule filter unit A1, the green reflected light passing through the green capsule filter unit A2, and the blue reflected light passing through the blue capsule filter unit A3 will be better mixed to form colored light.

[0142] In the above embodiment, the capsule filter layer is directly printed on the corresponding driving layer 110 by coating, and the electronic ink filter layer is directly patterned by yellow photolithography without the need to build a retaining wall, thereby reducing the difficulty of the process and avoiding the problem of low material utilization caused by cutting the electronic paper in the traditional way. It can be understood that the capsule filter layer can also be made on the transparent electrode layer 130, cut into the same size as the ink layer, and attached to the driving layer 110 by alignment and bonding, so that the red capsule filter unit A1, the green capsule filter unit A2 and the blue capsule filter unit A3 are aligned with the pixel electrode 111 of the lower driving layer 110, and then a circle of edge sealing glue is applied around the electronic paper and cured, and finally a protective layer is attached and hot pressed to complete the packaging of the color electronic paper display module.

[0143] The color electronic paper produced by the above method can avoid the color deviation caused by the incident angle of light because the black and white electronic ink capsules 122 and the color photoresist 121 are directly mixed and coated, and because the black and white electronic ink capsules 122 and the color photoresist 121 are directly mixed and coated, high-resolution image quality can be obtained through photolithography patterning.

[0144] See also Fig.23 One embodiment of the present invention further provides a color electronic paper 100, comprising:

[0145] A driving layer 110, wherein the driving layer 110 includes a plurality of pixel electrodes 111;

[0146] A capsule filter layer 120 is arranged on the surface of the driving layer 110, and the capsule filter layer includes a plurality of capsule filter units; each capsule filter unit corresponds to a pixel electrode of each driving pixel unit one by one; the capsule filter unit includes a color photoresist 121 and a plurality of black and white electronic ink capsules 122 filled in the color photoresist 121, and the black and white electronic ink capsules 122 include an electrophoretic liquid 1221 and black and white pigment particles 1222 and 1223 arranged in the electrophoretic liquid 1221; the plurality of capsule filter units form a three-color pattern of R, G, and B;

[0147] A transparent electrode layer 130 is disposed on the surface of the capsule filter layer 120; and

[0148] The transparent substrate 140 is disposed on the surface of the transparent electrode layer 130. In some other embodiments, the transparent substrate 140 can also be replaced by a waterproof layer.

[0149] See also Fig.24 Another embodiment of the present invention further provides a color electronic paper 100, comprising:

[0150] Transparent substrate 140;

[0151] The transparent electrode layer 130 is disposed on the surface of the transparent substrate 140;

[0152] A capsule filter layer 120 is arranged on the surface of the transparent electrode layer 130, and the capsule filter layer includes a plurality of capsule filter units; the capsule filter unit includes a color photoresist 121 and a plurality of black and white electronic ink capsules 122 filled in the color photoresist 121, and the black and white electronic ink capsules 122 include an electrophoretic liquid 1221 and black and white pigment particles 1222 and 1223 arranged in the electrophoretic liquid 1221; the plurality of capsule filter units form a three-color pattern of R, G, and B; and

[0153] The driving layer 110 is arranged on the surface of the capsule filter layer 120, and the driving layer 110 includes a plurality of driving pixel units, each of which includes a pixel electrode 111; the driving layer 110 and the capsule filter layer 120 are bonded together through a bonding layer 170, and each capsule filter unit corresponds to the pixel electrode 111 of each driving pixel unit one by one.

[0154] Compared with the prior art, the color electronic paper 100 provided by the embodiment of the present invention has the following advantages and beneficial effects:

[0155] The capsule filter layer of the color electronic paper includes a plurality of capsule filter units; the capsule filter units include color photoresist and a plurality of black and white electronic ink capsules filled in the color photoresist, and the color filter layer and the electronic ink capsule layer are combined into one. Compared with the traditional method of laminating the filter and the microcapsule layer together, the total thickness of the filter layer and the capsule layer can be made relatively small, thereby solving the problem of color deviation caused by the total thickness of the traditional filter and the capsule layer being too large, and thus making the prepared color electronic paper have better resolution; and greatly reducing the loss of light penetration and reflection, which can improve the effect of color display.

[0156] One embodiment of the present invention further provides a color display module, including the color electronic paper 100. The packaging process is: a circle of edge sealing glue is applied around the color electronic paper and cured, and finally a protective layer is attached and hot pressed to complete the packaging of the color display module, which simplifies the production process of the color electronic paper and the packaging process of the color display module and reduces the cost.

[0157] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A method for manufacturing a color electronic paper, characterized in that: The following steps are involved: Manufacturing a driving layer, wherein the driving layer includes a plurality of driving pixel units; A capsule filter layer is formed on the surface of the driving layer; the capsule filter layer includes a plurality of capsule filter units; Each capsule filter unit corresponds to a pixel electrode of each driving pixel unit one by one; the capsule filter unit includes a color photoresist and a plurality of black and white electronic ink capsules filled in the color photoresist; The plurality of capsule filter units form a three-color pattern of R, G, and B; Making a transparent electrode layer on the surface of the capsule filter layer; A transparent substrate or a waterproof layer is manufactured on the surface of the transparent electrode layer.

2. A method for manufacturing a color electronic paper, characterized in that: The following steps are involved: Making a transparent electrode layer on the surface of a transparent substrate; A capsule filter layer is formed on the surface of the transparent electrode layer; the capsule filter layer includes a plurality of capsule filter units; The capsule filter unit includes a color photoresist and a plurality of black and white electronic ink capsules filled in the color photoresist; the plurality of capsule filter units form a three-color pattern of R, G, and B; The capsule filter layer is attached to the surface of the driving layer, the driving layer comprises a plurality of driving pixel units, and each capsule filter unit corresponds to a pixel electrode of each driving pixel unit one by one.

3. The method for making color electronic paper according to any one of claims 1 or 2, characterized in that: The black and white electronic ink capsule comprises an electrophoretic liquid and black pigment particles and white pigment particles arranged in the electrophoretic liquid.

4. The method for making color electronic paper according to claim 3, characterized in that: The preparation of the capsule filter layer specifically comprises: The black and white electronic ink capsules are mixed with red photoresist, green photoresist and blue photoresist respectively to obtain red capsule light filter coating, green capsule light filter coating and blue capsule light filter coating respectively; The red capsule filter coating, the green capsule filter coating and the blue capsule filter coating are respectively coated, photolithographically patterned and cured to obtain a plurality of red capsule filter units, a plurality of green capsule filter units and a plurality of blue capsule filter units; the plurality of red capsule filter units, the plurality of green capsule filter units and the plurality of blue capsule filter units constitute a three-color pattern of R, G and B.

5. The method for making color electronic paper according to claim 4, characterized in that: In the process of making the capsule filter layer, the preparation process of the red capsule filter unit includes: Mixing the red photoresist with the black and white electronic ink capsules to form a red capsule light filter coating; Applying the red capsule filter coating on the driving layer or the transparent electrode layer to obtain a red capsule filter coating; performing patterning on the red capsule filter coating to obtain a patterned red capsule filter coating; baking the patterned red capsule filter coating at a temperature greater than or equal to 60 degrees Celsius to solidify the patterned red capsule filter coating to obtain a red capsule filter unit; The patterning process is specifically as follows: covering the red capsule filter coating with a first mask, the first mask having a light-transmitting area and a light-impermeable area, the light-transmitting area covering a position where the red capsule filter coating needs to be retained, and the light-impermeable area covering a position where the red capsule filter coating needs to be removed, exposing the red capsule filter coating with ultraviolet light, and then removing the unexposed red capsule filter coating with a developer, so as to pattern the red capsule filter coating; The patterning process may be: covering the red capsule filter coating with a first mask, the first mask having a light-transmitting area and a light-opaque area, the light-opaque area covering a position where the red capsule filter coating needs to be retained, and the light-transmitting area covering a position where the red capsule filter coating needs to be removed, exposing the red capsule filter coating in the light-transmitting area with ultraviolet light, and then using a developer to remove the exposed red capsule filter coating, thereby patterning the red capsule filter coating.

6. The method for manufacturing color electronic paper according to claim 4, characterized in that: In the process of making the capsule filter layer, the preparation process of the green capsule filter unit includes: Mixing the green photoresist with the black and white electronic ink capsules to form a green capsule light filter coating; Applying the green capsule filter coating on the driving layer or the transparent electrode layer to obtain a green capsule filter coating; The green capsule filter coating is patterned to obtain a patterned green capsule: baking the patterned green capsule filter coating at a temperature greater than or equal to 60 degrees Celsius to solidify the patterned green capsule filter coating to obtain a green capsule filter unit; The patterning process is specifically as follows: covering the green capsule filter coating with a first mask, the first mask having a light-transmitting area and a light-impermeable area, the light-transmitting area covering a position where the green capsule filter coating needs to be retained, and the light-impermeable area covering a position where the green capsule filter coating needs to be removed, exposing the green capsule filter coating with ultraviolet light, and then removing the unexposed green capsule filter coating with a developer, so as to pattern the green capsule filter coating; The patterning process may be: covering the green capsule filter coating with a first photomask, the first photomask having a light-transmitting area and a light-impermeable area, the light-impermeable area covering a position where the green capsule filter coating needs to be retained, and the light-transmitting area covering a position where the green capsule filter coating needs to be removed, exposing the green capsule filter coating in the light-transmitting area with ultraviolet light, and then removing the exposed green capsule filter coating with a developer, thereby patterning the green capsule filter coating.

7. The method for making color electronic paper according to claim 4, characterized in that: In the process of making the capsule filter layer, the preparation process of the blue capsule filter unit includes: Mixing the blue photoresist with the black and white electronic ink capsules to form a blue capsule light filter coating; Applying the blue capsule filter coating on the driving layer or the transparent electrode layer to obtain a blue capsule filter coating; The blue capsule filter coating is patterned to obtain a patterned blue capsule filter coating: baking the patterned blue capsule filter coating at a temperature greater than or equal to 60 degrees Celsius to solidify the patterned blue capsule filter coating to obtain a blue capsule filter unit; The patterning process is specifically as follows: covering the blue capsule filter coating with a first mask, the first mask having a light-transmitting area and a light-impermeable area, the light-transmitting area covering a position where the blue capsule filter coating needs to be retained, and the light-impermeable area covering a position where the blue capsule filter coating needs to be removed, exposing the blue capsule filter coating with ultraviolet light, and then removing the unexposed blue capsule filter coating with a developer, so as to pattern the blue capsule filter coating; The patterning process may be: covering the blue capsule filter coating with a first light mask, the first light mask having a light-transmitting area and a light-opaque area, the light-opaque area covering a position where the blue capsule filter coating needs to be retained, and the light-transmitting area covering a position where the blue capsule filter coating needs to be removed, exposing the blue capsule filter coating in the light-transmitting area with ultraviolet light, and then using a developer to remove the exposed blue capsule filter coating, thereby patterning the blue capsule filter coating.

8. The method for manufacturing color electronic paper according to claim 4, characterized in that: Before manufacturing the capsule filter layer, a black matrix layer is first manufactured on the driving layer, wherein the black matrix layer includes matrix stripes and a first region, a second region and a third region isolated by the matrix stripes; The red capsule filter unit is arranged in the first area of ​​the black matrix layer, the green capsule filter unit is arranged in the second area of ​​the black matrix layer, and the blue capsule filter unit is arranged in the third area of ​​the black matrix layer. The red capsule filter unit, the green capsule filter unit and the blue capsule filter unit are isolated from each other by the matrix stripes.

9. A color electronic paper, characterized in that: include: A driving layer, wherein the driving layer includes a plurality of driving pixel units; A capsule filter layer is arranged on the surface of the driving layer, and the capsule filter layer includes a plurality of capsule filter units; Each capsule filter unit corresponds to a pixel electrode of each driving pixel unit one by one; the capsule filter unit includes a color photoresist and a plurality of black and white electronic ink capsules filled in the color photoresist, and the plurality of capsule filter units form a three-color pattern of R, G, and B; A transparent electrode layer is arranged on the surface of the capsule filter layer; as well as The protective layer is arranged on the surface of the transparent electrode layer.

10. A color display module, characterized in that: Including the color electronic paper as described in claim 9.

Images