Reflection electronic book device and filling method thereof

Abstract

The invention provides a reflective electronic book device and a filling method thereof, the reflective electronic book device comprises a color filter substrate and an array substrate, the color filter substrate is provided with a plurality of frame sealing adhesives on two sides, the inner sides of the two frame sealing adhesives are provided with pixel retaining walls, and one side of each pixel retaining wall is provided with an auxiliary pixel retaining wall. The box body is pressed by designing a combination mode of vacuum and high-pressure extrusion, the electronic ink can be packaged in the box body in a short time by turning over the whole structure, volatilization of a solvent is reduced, diffusion of the electronic ink among pixels can be achieved through a vacuumizing mode after packaging, and the packaging efficiency of the electronic ink is improved. The high-temperature viscous glue and the inner retaining wall are bonded together through high temperature, the box body is kept sealed, electronic ink is prevented from leaking, meanwhile, absolute sealing of pixels is achieved in the mode that the box body is pressurized, and crosstalk of particles among the pixels is prevented.

Description

Technical Field

[0001] The invention relates to the field of reflective devices, and in particular to a reflective electronic book device and a filling method thereof. Background Art

[0002] Reflective display devices use ambient light for display. The current method for reflective display is electronic ink reflective display. The cost of steady-state electronic ink screen technology is currently relatively high. Steady electronic ink purchases electronic paper film materials from upstream Yuantai and integrates them on the driver backplane in the form of patches. The film material cost accounts for 35% of the total module. The cost of steady-state electronic ink is relatively high. In order to reduce costs, the electronic paper display display structure is used. By introducing a bottom reflective layer, the lateral horizontal electric field is increased, the lateral aggregation state of black or white particles is controlled, the reflection is increased, and the reflectivity is improved.

[0003] At present, the electronic ink filling process used in the display structure of electronic paper displays is vacuum box-to-box. Due to the rapid evaporation rate of electronic ink solvents, the electronic ink needs to be packaged into the box in a short time, but the time is too short, the electronic ink is not fully diffused, and the amount of electronic ink in the pixel is uneven. If the amount of electronic ink in the pixel is uneven, it will directly lead to problems with color display. Because the amount of electronic ink affects the depth of color, the difference in the amount of ink in the pixel will also have a negative impact on the contrast, resulting in a decrease in contrast. At the same time, it may reduce the effective resolution of the screen, impair the resolution, and cause problems such as drift of displayed content. For this reason, we propose a reflective electronic book device and a filling method thereof to solve the above problems. Summary of the invention

[0004] The present invention provides a reflective electronic book device and a filling method thereof, which solves the problem that when the electronic ink filling process is vacuum box-to-box, the electronic ink solvent volatilizes quickly and the electronic ink needs to be packaged into the box in a short time, resulting in insufficient diffusion of the electronic ink and uneven amount of electronic ink in pixels, which leads to uneven color, reduced contrast, impaired resolution and drift of displayed content.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a reflective electronic book device and a filling method thereof, including a color filter substrate and an array substrate, the color filter substrate is provided with a plurality of frame sealing glues on both sides, the inner sides of the two frame sealing glues are provided with pixel retaining walls, and an auxiliary pixel retaining wall is provided on one side of the pixel retaining wall.

[0006] In a preferred solution, a high temperature adhesive is provided between the two auxiliary pixel retaining walls, the high temperature adhesive is installed on the color filter substrate, and the pixel retaining wall and the auxiliary pixel retaining wall have the same height; The cross section of the inner retaining wall is 6~10um, the height of the pixel retaining wall is 28~30um, and the diameter of the silicon ball is 35~37um.

[0007] In a preferred solution, an inner retaining wall is provided on the array substrate, the inner retaining wall is a grid of a plurality of arrays, and electronic ink is provided in the grids of the array of the inner retaining wall.

[0008] In a preferred solution, the electronic ink includes a plurality of black particles and a plurality of white particles, and one end of the inner retaining wall is in contact with high-temperature viscous glue.

[0009] In a preferred solution, the frame sealant includes a plurality of silicon balls, and the diameter of the silicon balls is greater than the height of the pixel retaining wall.

[0010] In a preferred embodiment, the pixel retaining wall includes two half-pixel retaining walls, the auxiliary pixel retaining wall includes two half-auxiliary pixel retaining walls, one half-pixel retaining wall and one half-auxiliary pixel retaining wall are located on the color filter substrate, and the other half-pixel retaining wall and another half-auxiliary pixel retaining wall are located on the array substrate.

[0011] In a preferred solution, the height of the half-pixel retaining wall on the color filter substrate is greater than the height of the half-pixel retaining wall on the array substrate, and the heights of the half-pixel retaining wall and the half-auxiliary pixel retaining wall on the same substrate are the same.

[0012] A filling method for a reflective electronic book device, characterized by: S1, applying sealing glue to a color filter substrate and dripping electronic ink on an array substrate: dripping electronic ink into a plurality of grids of an inner retaining wall, quickly completing the box packaging after the electronic ink is dripped, and then attaching sealing glue to both sides of the color filter substrate; S2, upper and lower substrates are pressed together: After the color filter substrate and the array substrate are moved into the box-aligning device, the color filter substrate and the array substrate are aligned and pressed together to achieve box-aligning packaging. Since the diameter of the silicon ball in the frame sealant is larger than the height of the pixel retaining wall, the edge of the color filter substrate is propped up after the box-aligning device. S3, UV and heat curing of the frame sealant: the whole structure after the box is turned over, and the UV curing of the frame sealant is performed from the array substrate side, and then it is sent into a vacuum furnace for heat curing to achieve the edge sealing of the box; S4, vacuuming the whole structure and spreading the electronic ink: putting the whole structure after box assembly into a vacuum furnace, vacuuming to low pressure, and the vacuum degree inside the box is high pressure, the box generates outward pressure, the pixel retaining wall is separated from the color filter substrate, and a gap is generated, and the electronic ink spreads between the pixels; S5. Heat and pressurize the box to make it absolutely sealed: After the electronic ink diffuses for 30-60 minutes, put the whole structure into a heat press, set the pressure to high pressure, and the temperature to high temperature; The inner retaining wall is inserted with high temperature adhesive and is bonded with the high temperature adhesive; S6. Cut the box and remove the frame sealant: remove the edge frame sealant to remove its support function; S7. Heat and pressurize the box to flatten the overall structure to make the box thickness uniform: put the cut overall structure into a heat press and set the temperature to high temperature to achieve a uniform distance between pixels.

[0013] The beneficial effects of the present invention are as follows: the device drips electronic ink into the grid of the inner retaining wall on the array substrate when the color filter substrate and the array substrate are separated by the overall device, and then the box body is pressed by designing a combination of vacuum and upper and lower substrate extrusion. By flipping the overall structure, it can ensure that the electronic ink is encapsulated in the box body in a relatively short time, reducing the volatilization of the solvent, and after encapsulation, the electronic ink can be diffused between pixels by vacuuming. Later, the electronic ink is evenly diffused between pixels by vacuuming again, and high-temperature viscous glue is introduced between the color filter substrate and the array substrate. When the color filter substrate and the array substrate are vacuumed and pressed together with high pressure, the high-temperature viscous glue and the inner retaining wall are adhered together by high temperature to keep the box body sealed and avoid leakage of electronic ink. At the same time, the box body is pressurized to achieve absolute sealing of pixels and prevent particles from crosstalking between pixels.

[0014] The sealant includes multiple silicon balls, the diameter of which is larger than the height of the pixel retaining wall, to prevent the electronic ink from leaking from the box. By adding an auxiliary pixel retaining wall structure on the inner side of the pixel retaining wall, the pixel retaining wall is prevented from being unevenly stressed due to the gap between the pixel retaining wall and the sealant, thus improving the pressure uniformity problem. At the same time, due to the auxiliary pixel retaining wall structure, when the high temperature adhesive and the inner retaining wall are pressed together and subjected to high temperature, the inner retaining wall is prevented from being inserted into the high temperature adhesive to different depths, resulting in uneven pixel spacing.

[0015] The overall structure can encapsulate the electronic ink into the box in a short time and at the same time can diffuse the ink sufficiently to make the amount of electronic ink in the pixel uniform, avoiding the problems of uneven color, reduced contrast, impaired resolution and display content drift caused by uneven amount of electronic ink in the pixel, and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments; Figure 1 It is a schematic diagram of coating the frame sealant and dripping the electronic ink on the overall structure of the present invention; Figure 2 It is a schematic diagram of the vacuumization and lamination of the upper and lower substrates of the overall structure of the present invention; Figure 3 This is a schematic diagram of thermal curing of the integral structure frame sealant of the present invention; Figure 4 It is a schematic diagram of vacuuming the overall structure of the present invention; Figure 5 It is a schematic diagram of heating and pressurizing the overall structure of the present invention; Figure 6 It is a schematic diagram of the cutting of the overall structure of the present invention; Figure 7 It is a schematic diagram of heating and pressurizing the overall structure of the present invention; Figure 8 It is a schematic diagram of the local structure of the present invention; Fig. 9 It is another structural schematic diagram of the overall structure of the present invention in which there are two pixel retaining walls; In the figure: color filter substrate 1; array substrate 2; frame sealing glue 3; pixel retaining wall 4; auxiliary pixel retaining wall 5; high temperature viscous glue 6; inner retaining wall 7; electronic ink 8; black microparticles 801; white microparticles 802; vacuum furnace 9; hot press 10. DETAILED DESCRIPTION

[0017] Embodiment 1: like Figure 1-9 In the invention, a reflective electronic book device and a filling method thereof are provided, comprising a color filter substrate 1 and an array substrate 2. The color filter substrate 1 is provided with a plurality of frame sealants 3 on both sides. The inner sides of the two frame sealants 3 are provided with pixel retaining walls 4, and one side of the pixel retaining walls 4 is provided with auxiliary pixel retaining walls 5. With this structure, the device drips electronic ink 8 into the grid of the inner retaining wall 7 on the array substrate 2 when the color filter substrate 1 and the array substrate 2 are separated by the overall device, and then presses the box body by designing a combination of vacuum and squeezing the upper and lower substrates. By flipping the overall structure, it can ensure that the electronic ink 8 is encapsulated in the box body in a relatively short time, reducing the volatilization of the solvent, and after encapsulation, the electronic ink 8 can be diffused between pixels by vacuuming. At a later stage, the electronic ink 8 is evenly diffused between the pixels by vacuuming again, and at the same time, a high-temperature adhesive 6 is introduced between the color filter substrate 1 and the array substrate 2. When the color filter substrate 1 and the array substrate 2 are pressed together under vacuum and high pressure, high temperature is used to adhere the high-temperature adhesive 6 and the inner retaining wall 7 together to keep the box sealed and prevent the electronic ink 8 from leaking. At the same time, the box is pressurized to achieve absolute sealing of the pixels and prevent particles from crosstalking between pixels.

[0018] The sealant 3 includes a plurality of silicon balls, the diameter of which is greater than the height of the pixel retaining wall 4, to prevent the electronic ink 8 from leaking from the box body. By adding an auxiliary pixel retaining wall 5 structure inside the pixel retaining wall 4, the pixel retaining wall 4 is prevented from being subjected to uneven force due to the gap between the pixel retaining wall 4 and the sealant 3, thereby improving the problem of pressure uniformity. At the same time, due to the structure of the auxiliary pixel retaining wall 5, when the high-temperature adhesive 6 and the inner retaining wall 7 are pressed together and subjected to high temperature, the inner retaining wall 7 is prevented from being inserted into the high-temperature adhesive 6 to different depths, resulting in uneven pixel spacing.

[0019] The overall structure can encapsulate the electronic ink into the box in a short time, and at the same time can diffuse the ink sufficiently to make the amount of electronic ink in the pixel uniform, avoiding the problems of uneven color, reduced contrast, impaired resolution and display content drift caused by uneven amount of electronic ink in the pixel.

[0020] In a preferred solution, a high temperature adhesive 6 is provided between the two auxiliary pixel retaining walls 5 , and the high temperature adhesive 6 is installed on the color filter substrate 1 , and the pixel retaining wall 4 and the auxiliary pixel retaining wall 5 have the same height.

[0021] The cross section of the inner retaining wall 7 is 6-10 um, the height of the pixel retaining wall 4 is 28-30 um, and the diameter of the silicon ball is 35-37 um. With this structure, the pixel retaining wall 4 and the auxiliary pixel retaining wall 5 have the same height.

[0022] After the electronic ink 8 is dripped, due to the fast evaporation rate of the solvent, the box packaging needs to be completed in a short time. However, due to the short residence time, the diffusion is uneven, and due to the obstruction of the pixel retaining wall 4, the auxiliary pixel retaining wall 5 and the inner retaining wall 7, the diffusion is difficult. The color filter substrate 1 is coated with a sealant 3, wherein the diameter of the silicon ball in the sealant 3 needs to be greater than the height of the pixel retaining wall 4, so the diameter of the silicon ball is selected to be 35-37um. The color filter substrate 1 is designed with an auxiliary pixel retaining wall 5, and the height of the auxiliary pixel retaining wall 5 is consistent with the height of the pixel retaining wall 4. If there is no auxiliary pixel retaining wall 5 structure, the gap between the sealant 3 and the pixel retaining wall 4 will cause uneven pressure on the pixel retaining wall 4. When the high-temperature adhesive 6 is pressed to bond with the inner retaining wall 7, the depth of the retaining wall inserted into the adhesive is different, resulting in uneven spacing between pixels, thereby causing uneven color, reduced contrast, impaired resolution and drift of display content.

[0023] In a preferred solution, an inner retaining wall 7 is provided on the array substrate 2, and the inner retaining wall 7 is a grid of a plurality of arrays, and electronic ink 8 is provided in the grid of the array of the inner retaining wall 7. With this structure, the electronic ink 8 is dripped into the grid of each array.

[0024] In a preferred solution, the electronic ink 8 includes a plurality of black particles 801 and a plurality of white particles 802 , and one end of the inner retaining wall 7 is in contact with the high-temperature adhesive 6 .

[0025] In the preferred solution, the sealant 3 includes a plurality of silicon balls, and the diameter of the silicon balls is greater than the height of the pixel retaining wall 4. In this structure, the diameter of the silicon balls in the sealant 3 needs to be greater than the height of the pixel retaining wall 4, so the diameter of the silicon balls is selected to be 35-37 um. An auxiliary pixel retaining wall 5 is designed on the color filter substrate 1, and the height of the auxiliary pixel retaining wall 5 is consistent with the height of the pixel retaining wall 4.

[0026] Embodiment 2: Further described in conjunction with Example 1: A filling method for a reflective electronic book device is characterized by: S1, applying sealing glue 3 to the color filter substrate 1, and dripping electronic ink 8 to the array substrate 2: dripping electronic ink 8 into multiple grids of the inner retaining wall 7, and after the electronic ink 8 is dripped, quickly completing the box packaging, and then sticking the sealing glue 3 to both sides of the color filter substrate 1.

[0027] After the electronic ink 8 is dripped, due to the fast evaporation rate of the solvent, the box packaging needs to be completed in a short time. However, due to the short residence time, the diffusion is uneven, and due to the obstruction of the pixel retaining wall 4, the auxiliary pixel retaining wall 5 and the inner retaining wall 7, the diffusion is difficult; the color filter substrate 1 is coated with a sealant 3, wherein the diameter of the silicon ball in the sealant 3 needs to be greater than the height of the pixel retaining wall 4, so the diameter of the silicon ball is selected to be 35-37um. The color filter substrate 1 is designed with an auxiliary pixel retaining wall 5, and the height of the auxiliary pixel retaining wall 5 is consistent with the height of the pixel retaining wall 4. If there is no auxiliary pixel retaining wall 5 structure, the gap between the sealant 3 and the pixel retaining wall 4 will cause uneven pressure on the pixel retaining wall 4. When the high-temperature adhesive 6 is pressed to bond with the inner retaining wall 7, the depth of the retaining wall inserted into the adhesive is different, resulting in uneven spacing and distance between pixels.

[0028] S2, upper and lower substrates are pressed together: After the color filter substrate 1 and the array substrate 2 are moved into the box-aligning device, the color filter substrate 1 and the array substrate 2 are vacuumed to 100 Pa to ensure that there are no bubbles in the display unit after the box-aligning, and the color filter substrate 1 and the array substrate 2 are aligned and pressed together to achieve the box-aligning packaging. Since the diameter of the silicon ball in the frame sealant 3 is larger than the height of the pixel retaining wall 4, the edge of the color filter substrate 1 is propped up after the box-aligning; S3, UV and heat curing of the frame sealant 3: the whole structure after boxing is turned over, and the frame sealant 3 is cured by UV from one side of the array substrate 2, and then sent into a vacuum furnace 9 for heat curing to achieve edge sealing of the box; S4, vacuuming the whole structure and spreading the electronic ink 8: putting the assembled whole structure into a vacuum furnace 9, and evacuating it to low pressure. The vacuum degree inside the box is high pressure, and the box generates outward pressure, the pixel retaining wall 4 is separated from the color filter substrate 1, and a gap is generated, and the electronic ink 8 spreads between the pixels; S5. Heat and pressurize the box to make it absolutely sealed: after the electronic ink 8 diffuses for 30-60 minutes, put the whole structure into the heat press 10, set the pressure to high pressure and the temperature to high temperature; The inner retaining walls 7 are all inserted with the high temperature adhesive 6 and are all bonded with the high temperature adhesive 6; The pressure of the hot press 10 is set to 1Mpa, and the temperature is set to 100°C. Since the vacuum degree inside the box is 100Pa, and the high temperature adhesive 6 softens at 100°C, an inward pressure is generated, and the inner retaining wall 7 is inserted into the high temperature adhesive 6 on the color filter substrate 1 and adheres to it, so that the pixels are absolutely sealed. At this time, due to the support of the frame sealant 3, the depth of the inner retaining wall 7 inserted into the color filter substrate 1 varies. The thickness of the high temperature adhesive is 2-5um, and acrylic materials can be selected. It is non-sticky at room temperature and sticky at a high temperature of ≥100°C. The use temperature of the high temperature adhesive 6 used must be less than 130°C, and 130°C is the high temperature limit temperature of the electronic ink 8.

[0029] S6, cutting the box and removing the frame sealant 3: removing the edge frame sealant 3 to remove its supporting function; Since the pixel is sealed by the high temperature adhesive 6, the electronic ink 8 will not flow out; S7. Heat and pressurize the box to flatten the entire structure so that the box thickness is uniform: put the cut entire structure into a heat press 10, and set the temperature to a high temperature to achieve a uniform distance between pixels.

[0030] Embodiment 3: Combined with the description of Examples 1~2; in the preferred scheme, the pixel retaining wall 4 includes two half-pixel retaining walls 401, the auxiliary pixel retaining wall 5 includes two half-auxiliary pixel retaining walls 501, one half-pixel retaining wall 401 and one half-auxiliary pixel retaining wall 501 are located on the color filter substrate 1, and the other half-pixel retaining wall 401 and the other half-auxiliary pixel retaining wall 501 are located on the array substrate 2.

[0031] In a preferred solution, the height of the half-pixel retaining wall 401 on the color filter substrate 1 is greater than that of the half-pixel retaining wall 401 on the array substrate 2, and the half-pixel retaining wall 401 and the half-auxiliary pixel retaining wall 501 on the same substrate have the same height.

[0032] In the present device, since both the pixel retaining wall 4 and the auxiliary pixel retaining wall 5 are composed of two components, the support and anti-sealing function of the pixel retaining wall 4 and the auxiliary pixel retaining wall 5 is jointly exerted by the upper and lower structures. The height of the half-auxiliary pixel retaining wall 501 of the color filter substrate 1 is greater than the height of the half-auxiliary pixel retaining wall 501 on the array substrate 2. The two half-pixel retaining walls 401 and the two half-auxiliary pixel retaining walls 501 can be successfully stacked to form a support.

[0033] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A reflective electronic book device, characterized in that: The invention comprises a color filter substrate (1) and an array substrate (2), wherein the color filter substrate (1) is provided with a plurality of frame sealants (3) on both sides, the inner sides of the two frame sealants (3) are provided with pixel retaining walls (4), and one side of the pixel retaining walls (4) is provided with an auxiliary pixel retaining wall (5).

2. A reflective electronic book device according to claim 1, characterized in that: A high-temperature adhesive glue (6) is provided between the two auxiliary pixel retaining walls (5), and the high-temperature adhesive glue (6) is installed on the color filter substrate (1). The pixel retaining wall (4) and the auxiliary pixel retaining wall (5) have the same height. The cross section of the inner retaining wall (7) is 6-10 um, the height of the pixel retaining wall (4) is 28-30 um, and the diameter of the silicon ball is 35-37 um.

3. The reflective electronic book device according to claim 1, characterized in that: An inner retaining wall (7) is provided on the array substrate (2), the inner retaining wall (7) being a grid of a plurality of arrays, and electronic ink (8) is provided in the grid of the array of the inner retaining wall (7).

4. The reflective electronic book device according to claim 3, characterized in that: The electronic ink (8) includes a plurality of black microparticles (801) and a plurality of white microparticles (802), and one end of the inner retaining wall (7) is in contact with the high-temperature viscous glue (6).

5. The reflective electronic book device according to claim 1, characterized in that: The frame sealing glue (3) comprises a plurality of silicon balls, and the diameter of the silicon balls is greater than the height of the pixel retaining wall (4).

6. The reflective electronic book device according to claim 1, characterized in that: The pixel retaining wall (4) comprises two half-pixel retaining walls (401), the auxiliary pixel retaining wall (5) comprises two half-auxiliary pixel retaining walls (501), one half-pixel retaining wall (401) and one half-auxiliary pixel retaining wall (501) are located on the color filter substrate (1), and another half-pixel retaining wall (401) and another half-auxiliary pixel retaining wall (501) are located on the array substrate (2).

7. The reflective electronic book device according to claim 6, characterized in that: The height of the half-pixel retaining wall (401) on the color filter substrate (1) is greater than the height of the half-pixel retaining wall (401) on the array substrate (2); the half-pixel retaining wall (401) and the half-auxiliary pixel retaining wall (501) on the same substrate have the same height.

8. A method for filling a reflective electronic book device according to any one of claims 1 to 7, characterized in that: S1, coating the color filter substrate (1) with a sealing glue (3), and dripping electronic ink (8) onto the array substrate (2): dripping the electronic ink (8) into a plurality of grids of the inner retaining wall (7), and after dripping the electronic ink (8), quickly completing the box packaging, and then affixing the sealing glue (3) to both sides of the color filter substrate (1); S2, pressing the upper and lower substrates together: after the color filter substrate (1) and the array substrate (2) are moved into the box-pressing device, the pressure is evacuated to 100 Pa to ensure that there are no bubbles in the display unit after the box-pressing, and the color filter substrate (1) and the array substrate (2) are pressed together in position to achieve the box-pressing packaging. Since the diameter of the silicon ball in the frame sealant (3) is larger than the height of the pixel retaining wall (4), the edge of the color filter substrate (1) is propped up after the box-pressing; S3, UV and heat curing of the frame sealant (3): the whole structure after the box is assembled is turned over, and the frame sealant (3) is cured by UV from one side of the array substrate (2), and then sent to a vacuum furnace (9) for heat curing to achieve edge sealing of the box; S4, vacuuming the whole structure and diffusing the electronic ink (8): placing the whole structure after boxing into a vacuum furnace (9), vacuuming it to a low pressure, and the vacuum degree inside the box is a high pressure, the box generates outward pressure, the pixel retaining wall (4) is separated from the color filter substrate (1), a gap is generated, and the electronic ink (8) diffuses between the pixels; S5. Heat and pressurize the box to make it absolutely sealed: after the electronic ink (8) diffuses for 30-60 minutes, put the whole structure into a heat press (10), set the pressure to high pressure, and set the temperature to high temperature; The inner retaining wall (7) is inserted into the high temperature adhesive glue (6) and is adhered to the high temperature adhesive glue (6); S6, cutting the box and removing the frame sealant (3): removing the edge frame sealant (3) to remove its supporting function; S7, heating and pressurizing the box to flatten the entire structure so that the box thickness is uniform: the cut entire structure is placed in a heat press (10), and the temperature is set to a high temperature to achieve a uniform distance between pixels.

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