A color display module and a manufacturing method thereof

Abstract

The present invention discloses a color display module and a manufacturing method thereof, wherein the structure of the color display module is as follows: comprising a bottom plate substrate, the bottom plate substrate is provided with side edge seals around, a partition wall is provided on the bottom plate substrate, the partition wall is crisscrossed to form a rectangular grid, a driving circuit is provided in each rectangular grid, and electronic ink capsules are provided on the driving circuit, and the electronic ink capsules are alternately arranged in the order of one column of red capsules, one column of green capsules, and one column of blue capsules; a common electrode is covered on all electronic ink capsules, an upper substrate layer flush with the side edge seals is provided on the common electrode, an upper protective layer is provided above the side edge seals and the upper substrate layer, and a front light module is provided on the upper protective layer. The present invention accurately manufactures electronic ink capsules of different colors on each electrode of the display substrate, and the module has a thin thickness, better color brightness, higher purity, and fast reaction speed.

Description

Technical Field

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

[0002] Electronic paper technology is gradually shining in the logistics and education industries in the current market with its low power consumption and eye protection. However, due to technical problems, the application of electronic paper displays is still mainly black and white at this stage. The current mainstream color schemes include filter schemes and multi-color capsules / particles. Some shortcomings in the existing technology: for example, the existing color electronic paper technologies are filter schemes and multi-color particle schemes, but both schemes have obvious defects; filter scheme: all color images are relatively dim, and the brightness, hue, and purity of each color are relatively poor; multi-color capsules: the driving time is very long and it is not suitable for making into readers. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a color display module and a method for manufacturing the same, by which electronic ink capsules of different colors are accurately manufactured on each electrode of a display substrate, so that the color matching can be subsequently completed by controlling the grayscale color combination of a single sub-pixel.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a color display module, including a bottom plate substrate, the bottom plate substrate is provided with side sealing edges around, and partition walls are provided on the bottom plate substrate, and the partition walls are crisscrossed to form a rectangular grid, and a driving circuit is provided in each rectangular grid, and electronic ink capsules are arranged on the driving circuit, and the electronic ink capsules are alternately arranged in the order of one column of red capsules, one column of green capsules, and one column of blue capsules; a common electrode is covered on all the electronic ink capsules, and an upper substrate layer flush with the side sealing edges is provided on the common electrode, an upper protective layer is provided above the side sealing edges and the upper substrate layer, and a front light module is provided on the upper protective layer.

[0005] A method for manufacturing the color display module is also provided, comprising the following steps:

[0006] Step 1: Make a partition wall on the bottom plate template or the common electrode, wherein the material of the partition wall is a black / white capsule mixed negative photoresist or a patterned material, including epoxy resin, acrylic, and inorganic material;

[0007] Step 2: Use single drop infusion technology to sequentially apply capsule emulsions of various colors to each grid made in step 1; the three capsule emulsions are: red capsules, green capsules, and blue capsules, and the three emulsions are respectively composed of microcapsules of red particles + black particles, microcapsules of green particles + black particles, and microcapsules of blue particles + black particles, or directly infuse a mixture of red particles + black particles, green particles + black particles, and blue particles + black particles to form a microcup structure; and then use UV light (ultraviolet light) to cure it;

[0008] Step 3: Use transparent glue / transparent optical glue to bond the common electrode by vacuum bonding method; the common electrode is an indium tin oxide film, an AZO film, a metal mesh film or an organic transparent polymer conductive film;

[0009] Step 4: Assemble the front light module, which is a color filter, a front organic light source, a front light guide plate or various functional protective films;

[0010] Step 5: Apply sealant to the semi-finished product; use edge sealing glue to perform the final side edge sealing on the product.

[0011] Furthermore, the step 1 is specifically as follows:

[0012] 1) The partition wall is evenly coated on the base substrate, and the partition wall is initially formed into a film after baking;

[0013] 2) patterning the partition wall with UV light to form an array rectangular pattern on the partition wall;

[0014] 3) Use developer solution to remove the parts that have not been cured by UV light.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Thinner than the filter solution (omitting 100um of substrate, the filter block thickness is 2~10um).

[0017] 2. The color brightness is better than the filter solution (brightness increased by 3~5 times), and the purity is also increased by 20%~50% compared with the filter solution.

[0018] 3. The screen driving speed is 0.2~1s, which is faster than the current color capsule electronic paper of 3~5s.

[0019] 4. It also solves the problem that the current color capsule electronic paper cannot perform handwritten partial refresh.

[0020] 5. The white picture looks better and the white contrast is increased by 80%~100%. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the color display module of the present invention.

[0022] Figure 2 It is a partial schematic diagram of the electronic ink capsule in the color display module of the present invention.

[0023] Figure 3 It is a schematic diagram of a partition wall in a color display module of the present invention.

[0024] Figure 4 It is a schematic diagram of a color capsule in the color display module of the present invention.

[0025] Figure 5 It is a schematic diagram of two color capsules in the color display module of the present invention.

[0026] Figure 6 It is a schematic diagram of three color capsules in the color display module of the present invention.

[0027] In the figure: bottom substrate 11; driving circuit 12; electronic ink capsule 21; red capsule 211; green capsule 212; blue capsule 213; partition wall 22; common electrode 23; upper substrate layer 24; side sealing edge 31; upper protective layer 32; front light module 4. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] like Figure 2 As shown, the present invention is composed of a large number of pixels A, and its composition is designed with reference to the existing TFT array substrate. A single pixel A is composed of three sub-pixels, red sub-pixel a1, green sub-pixel a2, blue sub-pixel a3 and a partition wall 22. The three sub-pixels can display black and their own colors (R / G / B) respectively. Pixel A needs to rely on three sub-pixels to display seven colors of R\G\B\C\Y\M\K respectively, and the combination of different grayscales in the three sub-pixels to achieve the display of more and more colors. The white capsule of the partition wall 22 is used for auxiliary driving when driving the white screen later. Its driving voltage is higher than that of all color particles, so it can maintain a fixed color when driving the color normally.

[0030] Specifically, the color display module of the present invention has the following structure: it includes a bottom plate substrate 11, the bottom plate substrate 11 is provided with side sealing edges 31 around, and a partition wall 22 is provided on the bottom plate substrate 11, and the partition wall 22 is crisscrossed to form a rectangular grid, and a driving circuit 12 is provided in each rectangular grid, and the driving circuit 12 is provided with electronic ink capsules 21, and the electronic ink capsules 21 are alternately arranged in the order of a row of red capsules 211, a row of green capsules 212, and a row of blue capsules 213; a common electrode 23 is covered on all the electronic ink capsules 21, and an upper substrate layer 24 flush with the side sealing edges 31 is provided on the common electrode 23, and an upper protective layer 32 is provided above the side sealing edges 31 and the upper substrate layer 24, and a front light module 4 is provided on the upper protective layer 32.

[0031] Step 1 can be performed in the following manner (this solution is not limited by the size of the base plate):

[0032] 1) The partition wall 22 is evenly coated on the base substrate 11, and the partition wall 22 is initially formed into a film by baking;

[0033] 2) patterning the partition wall 22 with UV light so that the partition wall 22 forms an array rectangular pattern;

[0034] 3) Use developer solution to remove the parts that have not been UV-cured.

[0035] Step 2: Use ODF technology (single drop perfusion technology) to accurately apply capsule emulsions of various colors to each grid produced in step 1 in sequence; the three capsule emulsions are: red capsule 211, green capsule 212, and blue capsule 213. The three emulsions are respectively composed of microcapsules of red particles + black particles; microcapsules of green particles + black particles; and microcapsules of blue particles + black particles (red particles + black particles; green particles + black particles; blue particles + black particles can also be used to directly perfuse a mixed solution to form a microcup structure), and then cured using UV light.

[0036] Step 3: Apply transparent glue / transparent optical glue to the product.

[0037] Step 4: Cut the semi-finished product after step 3 into the shape we need and then align it with the base substrate 11 with an error of no more than 10um.

[0038] Step 4: Assemble the front light module 4 (the front light module 4 may be a color filter, a front organic light source, a front light guide plate, various functional protective films, etc.).

[0039] Step 5: Apply sealant to the semi-finished product; use the edge sealing glue currently known in the market to perform the final side edge sealing 31 treatment on the product to enhance the product's chemical resistance and extend its service life.

[0040] As an improvement, step 1 can also be performed in the following manner: a partition wall 22 is made on the common electrode 23, and the material of the partition wall 22 is a black / white capsule mixed negative photoresist or a patterned material, including epoxy resin, acrylic, and inorganic material; (the common electrode 23 can be an ITO (indium tin oxide) film; an AZO film; a metal mesh film; or various organic transparent polymer conductive films).

Claims

1. A method for manufacturing a color display module, the color display module comprising a base plate (11), the base plate (11) being provided with side sealing edges (31) around the base plate (11), partition walls (22) being provided on the base plate (11), the partition walls (22) being crisscrossed to form a rectangular grid, a driving circuit (12) being provided in each rectangular grid, electronic ink capsules (21) being provided on the driving circuit (12), the electronic ink capsules (21) being alternately provided in the order of one row of red capsules (211), one row of green capsules (212), and one row of blue capsules (213); a layer of common electrodes (23) being provided on all the electronic ink capsules (21), an upper substrate layer (24) being provided on the common electrodes (23) and being flush with the side sealing edges (31), an upper protective layer (32) being provided on the side sealing edges (31) and the upper substrate layer (24), and a front light module (4) being provided on the upper protective layer (32); It is characterized in that The following steps are involved: Step 1: making a partition wall (22) on the base plate template (1) or the common electrode (23), wherein the material of the partition wall (22) is a black / white capsule mixed negative photoresist or a patterned material, including epoxy resin, acrylic, or inorganic material; Step 2: using a single drop infusion technique to sequentially apply capsule emulsions of various colors to each grid produced in step 1; the three capsule emulsions are: red capsules (211), green capsules (212), and blue capsules (213), and the three emulsions are respectively composed of microcapsules of red particles + black particles, microcapsules of green particles + black particles, and microcapsules of blue particles + black particles, or directly infusing a mixture of red particles + black particles, green particles + black particles, and blue particles + black particles to form a microcup structure; and then curing them using UV light; Step 3: Using transparent glue to bond the common electrode (23) by vacuum bonding; the common electrode (23) is an indium tin oxide film, an AZO film, a metal mesh film or an organic transparent polymer conductive film; Step 4: assembling a front light module (4), wherein the front light module (4) is a color filter, a front organic light source, a front light guide plate or various functional protective films; Step 5: Apply sealant to the semi-finished product; and perform the final side edge sealing (31) on the product with edge sealing glue.

2. The method for manufacturing a color display module according to claim 1, characterized in that: The step 1 is specifically as follows: 1) evenly coating the partition wall (22) on the bottom plate substrate (11), and baking the partition wall (22) to form a preliminary film; 2) patterning the partition wall (22) using UV light so that the partition wall (22) forms an array rectangular pattern; 3) Use developer solution to remove the parts that have not been UV-cured.

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