Electrophoretic display module and preparation method

Abstract

The invention discloses an electrophoretic display module and a preparation method. The electrophoretic display module comprises a back plate, a substrate and electrophoretic ink. The back plate comprises a first body part and a first protruding part which are connected with each other, the first protruding part comprises a plurality of blocking strips which are distributed at intervals in the first direction, and a groove is defined by every two adjacent blocking strips. The substrate comprises a second body part and a second protruding part which are connected with each other, the second protruding part comprises a check block, and pixel grids are defined by the grooves and the check blocks. And electrophoretic ink is arranged in the pixel grids. According to the electrophoretic display module provided by the embodiment of the invention, the pixel grids are designed in a separated manner, only the barrier strips which extend in the single direction and are distributed at intervals are arranged on the back plate, the plurality of stop blocks are arranged on the substrate, and the barrier strips and the stop blocks are used for forming the pixel grids together, so that when the back plate is coated with electrophoretic ink, since the surface of the back plate is provided with fewer gullies, the electrophoretic ink is more uniform; therefore, the influence on the covering of the electrophoretic ink is reduced, the generation of bubbles is reduced, and the visual effect of the display module is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrophoretic display screens, and in particular to an electrophoretic display module and a preparation method thereof. Background Art

[0002] The principle of electrophoretic display technology is to use colored charged balls (i.e., electrophoretic ink) to move in a liquid environment under an external electric field to present display effects of different colors. In the prior art, electrophoretic display screens choose to manufacture multiple pixel grids on the backplane, and apply electrophoretic ink in the pixel grids, so as to generate reflection area and absorption area patterns by applying appropriate voltage to each area of ​​the display, thereby forming an image. In the prior art, the electrophoretic ink in the pixel grids of the electrophoretic display screen is prone to bubbles, which leads to problems such as visual defects and color distortion. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an electrophoretic display module, which can reduce the generation of bubbles in pixel cells and improve the visual effect of the display module.

[0004] The invention also provides a method for preparing the electrophoretic display module.

[0005] According to the first aspect of the present invention, the electrophoretic display module comprises a backplane, a substrate and electrophoretic ink. The backplane comprises a first main body and a first protruding part connected to each other, the first main body comprises a first reference plane, the first protruding part is connected to the first reference plane, the first protruding part comprises a plurality of bars spaced apart along a first direction, two adjacent bars and the first reference plane jointly define a groove, the bars extend along a second direction, and any two of the first direction, the second direction and the vertical direction are perpendicular to each other. The substrate is arranged above the backplane, the substrate comprises a second main body and a second protruding part connected to each other, the second main body comprises a second reference plane, the second protruding part is connected to the second reference plane, the second protruding part comprises a block, a plurality of blocks are arranged in each groove, and the plurality of blocks arranged in the same groove are spaced apart along the second direction, the groove, two adjacent blocks arranged in the same groove and the second reference plane jointly define a pixel grid. The electrophoretic ink is arranged in the pixel grid.

[0006] The electrophoretic display module according to the first aspect of the present invention has at least the following beneficial effects: the pixel grids in the prior art are directly formed on the backplane, so there are more grooves on the backplane surface, and the surface with more grooves has a more complex geometric shape and more concave areas, which are easy to capture air to form bubbles, and the flow of liquid on the surface with more grooves is hindered. Poor flow may also cause air to be trapped in the liquid to form bubbles. The surface tension of the liquid on the complex surface also varies in different areas, resulting in a convex liquid surface in some areas, such as the corners of the pixel grid, thereby capturing air to form bubbles. The electrophoretic display module of the embodiment of the present invention has a separate design for the pixel grid, and only unidirectionally extending and spaced baffles are set on the backplane, and multiple baffles are set on the substrate. The baffles and baffles are used to form pixel grids together. Therefore, when the electrophoretic ink is coated on the backplane, since there are fewer surface grooves on the backplane, the impact on the electrophoretic ink coverage is reduced, and the generation of bubbles is reduced, thereby improving the visual effect of the display module.

[0007] According to some embodiments of the present invention, a receiving groove is formed in the first main body portion, a bottom wall of the receiving groove is the first reference plane, and along the second direction, a length of the receiving groove is greater than a length of the blocking bar.

[0008] According to some embodiments of the present invention, the distance between two adjacent blocking strips is L1, 0.1 mm ≤ L1 ≤ 0.5 mm. And / or, along the second direction, the distance between two adjacent blocking blocks is L2, 0.1 ≤ L2 ≤ 0.5 mm.

[0009] According to some embodiments of the present invention, the material of the backplane is a thin film transistor, and / or the material of the substrate is indium tin oxide.

[0010] According to some embodiments of the present invention, the blocking bar extends straightly along the second direction, the side surface of the blocking bar is a plane, and the shape of the blocking block is a cuboid or a cube.

[0011] According to the preparation method of the second aspect of the present invention, the following steps are included: processing a first plate into a back plate, the back plate includes a first main body and a first protrusion connected to each other, the first main body includes a first reference plane, the first protrusion is connected to the first reference plane, the first protrusion includes a plurality of bars spaced apart along a first direction, adjacent bars and the first reference plane together form a groove, the bars extend along a second direction, any two of the first direction, the second direction and the vertical direction are perpendicular to each other. Processing a second plate into a substrate, the substrate includes a second main body and a second protrusion connected to each other, the second main body includes a second reference plane, the second protrusion is connected to the second reference plane, and the second protrusion includes a block. Electrophoretic ink is arranged in the groove. Pressing the substrate onto the back plate, so that: the block is arranged in the groove, and a plurality of the blocks arranged in the same groove are spaced apart along the second direction, the groove, two adjacent blocks arranged in the same groove and the second reference plane together define a pixel grid, so that the pixel grid contains the electrophoretic ink.

[0012] According to the preparation method of the second aspect of the present invention, at least the following beneficial effects are achieved: the pixel grids in the prior art are directly formed on the backplane, so there are more grooves on the backplane surface, and the surface with more grooves has more complex geometric shapes and more concave areas, which are easy to capture air to form bubbles, and the flow of liquid on the surface with more grooves is hindered. Poor flow may also cause air to be trapped in the liquid to form bubbles. The surface tension of the liquid on the complex surface also varies in different areas, resulting in a convex liquid surface in some areas, such as the corners of the pixel grid, thereby capturing air to form bubbles. The preparation method of the electrophoretic display module of the embodiment of the present invention processes the first plate into a backplane, processes unidirectionally extending and spaced baffles on the first main body, and sets a plurality of baffles on the substrate, and uses the baffles and baffles to form pixel grids together. Therefore, when electrophoretic ink is coated on the backplane, since the surface of the backplane has fewer grooves, the impact on the electrophoretic ink coverage is reduced, and the generation of bubbles is reduced, thereby improving the visual effect of the display module.

[0013] According to some embodiments of the present invention, processing the first plate into the backplane includes the following steps: spin-coating photoresist on the upper surface of the first plate, and using a mask photolithography process to etch a plurality of blocking strips spaced along the first direction and extending along the second direction on the upper surface of the first plate to form the first protrusion. And / or, processing the second plate into the substrate includes the following steps: spin-coating photoresist on the lower surface of the second plate, and using a mask photolithography process to etch a plurality of blocking blocks spaced along the first direction and the second direction on the lower surface of the second plate to form the second protrusion.

[0014] According to some embodiments of the present invention, processing the second plate material into the substrate includes the following steps: processing the second plate material into the second main body portion, coating thermoplastic plastic on the second reference surface, and hot pressing the plastic using a hot pressing mold to form the second protrusion on the second reference surface after the plastic is cooled.

[0015] According to some embodiments of the present invention, the second main body portion is flexible, and the disposing of the electrophoretic ink in the groove includes the following steps: dropping the electrophoretic ink on one end of the groove along the second direction; taking the end of the groove where the electrophoretic ink is dropped as the starting end, pressing one end of the substrate to the starting end; and gradually pressing the substrate to the backplane along the second direction so that the electrophoretic ink flows from the starting end to the other end of the groove.

[0016] According to some embodiments of the present invention, gradually pressing the substrate onto the backplane along the second direction further includes the following steps: placing a pressure roller on the surface of the substrate opposite to the backplane, wherein the length of the pressure roller is greater than the length of the substrate along the first direction, and the pressure roller is placed at the end of the substrate that is first pressed onto the backplane; and driving the pressure roller to roll along the second direction.

[0017] According to some embodiments of the present invention, after the substrate is pressed onto the backplane, the preparation method further includes the following steps: wiping off the electrophoretic ink overflowed from the backplane and the substrate, and applying sealant to the edge of the substrate to seal the substrate and the backplane.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 is an exploded view of an electrophoretic display module in one embodiment of the present invention; Figure 2 for Figure 1 A magnified image of area A; Figure 3 is a diagram of the preparation process of an electrophoretic display module in one embodiment of the present invention; Figure 4 for Figure 3 Enlarged view of area B; Figure 5 is a top view of a back plate of an electrophoretic display module in one embodiment of the present invention; Figure 6 A bottom view of a substrate of an electrophoretic display module in one embodiment of the present invention; Figure 7 It is a schematic diagram of a substrate of an electrophoretic display module after being pressed onto a backplane in an embodiment of the present invention.

[0020] Figure numerals: electrophoretic display module 100, back panel 101, first main body 102, first protrusion 103, first reference plane 104, baffle 105, groove 106, substrate 107, second main body 108, second protrusion 109, second reference plane 110, baffle 111, accommodating groove 112, pressure roller 301, starting end 302, electrophoretic ink 501, pixel grid 701. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0024] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0025] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0026] refer to Figure 1 , Figure 2 , Figures 5 to 7 The electrophoretic display module 100 according to the first embodiment of the present invention comprises a back plate 101, a substrate 107 and an electrophoretic ink 501. The back plate 101 comprises a first main body 102 and a first protruding portion 103 connected to each other, the first main body 102 comprises a first reference plane 104, the first protruding portion 103 is connected to the first reference plane 104, the first protruding portion 103 comprises a plurality of bars 105 spaced apart along a first direction, two adjacent bars 105 and the first reference plane 104 jointly define a groove 106, the bars 105 extend along a second direction, and any two of the first direction, the second direction and the vertical direction are perpendicular to each other. The substrate 107 is disposed above the back plate 101. The substrate 107 includes a second main body 108 and a second protruding portion 109 connected to each other. The second main body 108 includes a second reference surface 110. The second protruding portion 109 is connected to the second reference surface 110. The second protruding portion 109 includes a stopper 111. A plurality of stoppers 111 are disposed in each groove 106. The plurality of stoppers 111 disposed in the same groove 106 are spaced apart along the second direction. The groove 106, two adjacent stoppers 111 disposed in the same groove 106, and the second reference surface 110 jointly define a pixel grid 701. Electrophoretic ink 501 is disposed in the pixel grid 701.

[0027] The pixel grids 701 in the prior art are directly formed on the back plate 101, so there are many grooves on the surface of the back plate 101. The surface with many grooves has a more complex geometric shape and more recessed areas, which are easy to capture air to form bubbles. In addition, the flow of liquid on the surface with many grooves is hindered. The poor flow may also cause air to be trapped in the liquid to form bubbles. The surface tension of the liquid on the complex surface also varies in different areas, resulting in a raised liquid surface in certain areas, such as the corners of the pixel grid 701, thereby capturing air to form bubbles. The electrophoretic display module 100 of the embodiment of the present invention has a separated pixel grid 701, and only unidirectionally extending and spaced-apart blocking strips 105 are provided on the back panel 101, and a plurality of blocking blocks 111 are provided on the substrate 107. The blocking strips 105 and the blocking blocks 111 are used to form the pixel grid 701. Therefore, when the electrophoretic ink 501 is coated on the back panel 101, since the back panel 101 has fewer surface grooves, the impact on the coverage of the electrophoretic ink 501 is reduced, the generation of bubbles is reduced, and the visual effect of the display module is improved.

[0028] It should be noted that in some embodiments of the present invention, the substrate 107 is flexible, specifically, it can be made of a material such as indium tin oxide, so that when the substrate 107 is pressed onto the back panel 101, it can be pressed gradually, thereby achieving the effect of expelling bubbles during the pressing process, further reducing the bubbles in the electrophoretic ink 501.

[0029] refer to Figure 1 , Figure 2 and Figure 4 In some embodiments of the present invention, the first body portion 102 is provided with a receiving groove 112, the bottom wall of the receiving groove 112 is the first reference surface 104, and along the second direction, the length of the receiving groove 112 is greater than the length of the blocking bar 105. Setting the length of the receiving groove 112 greater than the length of the blocking bar 105 can provide redundancy for the laying of the electrophoretic ink 501. In order to prevent the amount of the laid electrophoretic ink 501 from being insufficient, the amount of electrophoretic ink 501 actually dripped will be slightly more than the amount required in the groove 106. If the receiving groove 112 is not provided, after the substrate 107 is pressed onto the back plate 101, the redundant electrophoretic ink 501 will be squeezed out completely, thus causing a waste of raw materials, increasing the manufacturing cost and the subsequent process of erasing the redundant electrophoretic ink 501. If a longer receiving groove 112 is provided at least at one end of the blocking bar 105, part of the redundant electrophoretic ink 501 can be accommodated, and the ink of this part can be sealed together in the display screen to reduce waste.

[0030] refer to Figure 5 and Figure 6In some embodiments of the present invention, the distance between two adjacent blocking strips 105 is L1, 0.1 mm ≤ L1 ≤ 0.5 mm. And / or, along the second direction, the distance between two adjacent blocking blocks 111 is L2, 0.1 ≤ L2 ≤ 0.5 mm. Figure 7 As shown, the size of L1 and L2 determines the length and width of the final pixel grid 701. Specifically, L1 can be 0.1mm, 0.3mm, 0.5mm, etc., and L2 can be 0.1mm, 0.3mm, 0.5mm, etc. When L1 or L2 is greater than 0.5mm, the formed pixel grid 701 is too large, the number of pixels per unit area is reduced, and the resolution is reduced, so the image fineness and clarity will be reduced, and the visual experience is not good; when L1 or L2 is less than 0.1mm, the formed pixel grid 701 is too small, requiring higher manufacturing precision and complex processes to ensure the stability and consistency of each pixel, which will increase the manufacturing cost, and may also cause difficulty in arranging and moving the electrophoretic ink 501, resulting in display instability and other problems. Therefore, controlling the size of L1 and L2 between 0.1mm-0.5mm can well balance the dual needs of manufacturing cost and imaging quality.

[0031] It should be noted that in some embodiments of the present invention, preferably, the size of L1 is equal to the size of L2, so that the final pixel grid 701 can be square. The square pixel grid 701 can ensure that the image has the same resolution in the horizontal and vertical directions, thereby avoiding the image from being stretched or compressed in a certain direction, making the image more realistic and natural, and improving the clarity and fineness of the image.

[0032] In some embodiments of the present invention, the material of the backplane 101 is a thin film transistor, and / or the material of the substrate 107 is indium tin oxide. Thin film transistors are also known as TFTs. TFT technology can achieve pixel-level control, provide high-resolution display effects, and have a fast response time, so that the electrophoretic display module 100 can reduce the phenomenon of smearing and blurring when displaying dynamic images, achieve smooth video playback, and also have the advantages of low power consumption and high reliability. Indium tin oxide, also known as ITO, has high conductivity, can reduce resistance loss, and ensure that the current in the electrophoretic display module 100 can be transmitted stably and efficiently. ITO has a high visible light transmittance, so that the electrophoretic display module 100 can maintain high clarity while ensuring that light passes through the substrate 107 to achieve a good display effect. ITO also has the advantages of good chemical corrosion resistance and wear resistance. It should be noted that the backplane 101 can also use silicon-based semiconductor materials, metal oxide materials such as zinc oxide, graphene and other materials; the substrate 107 can also use transparent glass and other materials.

[0033] refer to Figure 1 , Figure 5 and Figure 6 In some embodiments of the present invention, the baffle 105 extends straight along the second direction, the side of the baffle 105 is a plane, and the shape of the block 111 is a cuboid or a cube. Designing it into a plane shape, a cuboid shape or a cube shape can make the block 111 better pressed between two adjacent baffles 105, and reduce unnecessary gaps, and fit more closely. It should be noted that designing the baffle 105 into a straight and plane side and designing the block 111 into a cuboid or a cube are not necessary conditions for manufacturing but are preferred solutions. In some embodiments of the present invention, the baffle 105 and the block 111 can also be designed as curved surfaces, and the surfaces in contact after the two are fitted together can fit each other.

[0034] The preparation method according to the second aspect of the present invention comprises the following steps: processing the first plate into a back plate 101, the back plate 101 comprises a first main body 102 and a first protrusion 103 connected to each other, the first main body 102 comprises a first reference plane 104, the first protrusion 103 is connected to the first reference plane 104, the first protrusion 103 comprises a plurality of bars 105 spaced apart along a first direction, adjacent bars 105 and the first reference plane 104 jointly form a groove 106, the bars 105 extend along a second direction, any two of the first direction, the second direction and the vertical direction are perpendicular to each other. Processing the second plate into a substrate 107, the substrate 107 comprises a second main body 108 and a second protrusion 109 connected to each other, the second main body 108 comprises a second reference plane 110, the second protrusion 109 is connected to the second reference plane 110, and the second protrusion 109 comprises a block 111. Placing the electrophoretic ink 501 in the groove 106. The substrate 107 is pressed onto the back plate 101 so that: the block 111 is arranged in the groove 106, and the multiple blocks 111 arranged in the same groove 106 are spaced apart along the second direction, the groove 106, two adjacent blocks 111 arranged in the same groove 106 and the second reference plane 110 jointly define a pixel grid 701, so that the pixel grid 701 contains electrophoretic ink 501.

[0035] The pixel grids 701 in the prior art are directly formed on the back plate 101, so there are many grooves on the surface of the back plate 101. The surface with many grooves has a more complex geometric shape and more recessed areas, which are easy to capture air to form bubbles. In addition, the flow of liquid on the surface with many grooves is hindered. The poor flow may also cause air to be trapped in the liquid to form bubbles. The surface tension of the liquid on the complex surface also varies in different areas, resulting in a raised liquid surface in certain areas, such as the corners of the pixel grid 701, thereby capturing air to form bubbles. The preparation method of the electrophoretic display module 100 of the embodiment of the present invention is to process the first plate material into the back plate 101, process the unidirectionally extending and spaced-apart blocking strips 105 on the first main body 102, and set a plurality of blocking blocks 111 on the substrate 107, and use the blocking strips 105 and the blocking blocks 111 to form a pixel grid 701. Therefore, when the electrophoretic ink 501 is coated on the back plate 101, since the back plate 101 has fewer surface grooves, the impact on the coverage of the electrophoretic ink 501 is reduced, the generation of bubbles is reduced, and the visual effect of the display module is improved.

[0036] In some embodiments of the present invention, processing the first plate into the back plate 101 includes the following steps: spin-coating photoresist on the upper surface of the first plate, and etching a plurality of stoppers 105 spaced along the first direction and extending along the second direction on the upper surface of the first plate using a mask photolithography process to form a first protrusion 103. And / or, processing the second plate into the substrate 107 includes the following steps: spin-coating photoresist on the lower surface of the second plate, and etching a plurality of stoppers 111 spaced along the first direction and the second direction on the lower surface of the second plate using a mask photolithography process to form a second protrusion 109. The basic principle of mask photolithography technology is that the light emitted by the illumination light source passes through the illumination system, through the transparent part of the mask, enters the projection objective system, forms an image on the photoresist, and the physical and chemical properties of the photoresist exposed to the light change, thereby transferring the mask pattern information to the photoresist, and finally transferring the pattern to the first plate or the second plate through subsequent processes such as development and etching, thereby forming the target back plate 101 and substrate 107. The mask lithography process can accurately manufacture the blocking strips 105 and the blocking blocks 111 on the back plate 101 and the substrate 107, and since it is a processing of a whole plate, the integrated molding can effectively improve the production efficiency.

[0037] It should be noted that, in some embodiments of the present invention, the step of preparing the substrate 107 includes using a flexible second plate material for mask lithography processing, and the processed second protrusion 109 is also flexible. Therefore, when the substrate 107 is pressed onto the back plate 101, even if the block 111 is not exactly located between two adjacent baffles 105, the flexibility of the block 111 can be used to squeeze it into the groove 106, or it can be directly pressed tightly, so that the back plate 101 and the substrate 107 can be fitted together.

[0038] In some embodiments of the present invention, processing the second plate into the substrate 107 includes the following steps: processing the second plate into the second body portion 108, coating the second reference surface 110 with thermoplastic plastic, and using a hot pressing mold to hot press the plastic so that the plastic is cooled to form a second protrusion 109 on the second reference surface 110. Such a design can meet the need to use different materials for the second body portion 108 and the second protrusion 109. The second body portion 108 is first processed, and then the plastic is processed by coating and hot pressing to form the second protrusion 109 on the second body portion 108 to make the substrate 107. The hard plastic as the stopper 111 can improve the structural stability of the pixel grid 701 after molding, and improve the structural strength of the electrophoretic display module 100.

[0039] refer to Figures 3 to 5 In some embodiments of the present invention, the second body portion 108 is flexible, and the electrophoretic ink 501 is arranged in the groove 106, including the following steps: dropping the electrophoretic ink 501 on one end of the groove 106 along the second direction; taking the end of the groove 106 where the electrophoretic ink 501 is dropped as the starting end 302, pressing one end of the substrate 107 on the starting end 302; gradually pressing the substrate 107 on the back plate 101 along the second direction, so that the electrophoretic ink 501 flows from the starting end 302 to the other end of the groove 106. Such pressing can realize the process of squeezing the electrophoretic ink 501 from the starting end 302 to the other end during the pressing process, and the electrophoretic ink 501 is also smoothly laid in the groove 106 when the pressing is completed, and the bubbles in the electrophoretic ink 501 can also be discharged during the squeezing process. Reducing the residual bubbles in the electrophoretic ink 501 and dropping the electrophoretic ink 501 in the groove 106 and squeezing it can also avoid the problem of the electrophoretic ink 501 overflowing from the upper surface of the groove 106 in the traditional spin coating method, thereby causing lateral movement and causing uneven color distribution in the displayed image.

[0040] It should be noted that, in some embodiments of the present invention, before pressing the substrate 107 onto the back panel 101, it is also necessary to position the substrate 107 and the back panel 101. Specifically, positioning points may be marked on both the back panel 101 and the substrate 107, or mechanical positioning may be performed using mechanical limits. The purpose is to ensure that the block 111 is located vertically between two adjacent baffles 105 before pressing, thereby improving the quality of the pressed pixel grid 701.

[0041] refer to Figure 3 and Figure 4In some embodiments of the present invention, gradually pressing the substrate 107 onto the back plate 101 along the second direction further comprises the following steps: placing a pressing roller 301 on the surface of the substrate 107 opposite to the back plate 101, the length of the pressing roller 301 along the first direction is greater than the length of the substrate 107, and the pressing roller 301 is placed at the end of the substrate 107 that is first pressed onto the back plate 101; driving the pressing roller 301 to roll the pressing roller 301 along the second direction. Rolling can ensure the uniformity of the pressing degree of each part, improve the pressing efficiency, maintain the flatness of the pressed surface, and reduce damage to the substrate 107.

[0042] In some embodiments of the present invention, after the substrate 107 is pressed onto the back plate 101, the preparation method further includes the following steps: erasing the electrophoretic ink 501 overflowing from the back plate 101 and the substrate 107, and applying sealant to the edge of the substrate 107 to seal the substrate 107 and the back plate 101. Erasing the back plate 101 to improve the overall cleanliness of the electrophoretic display module 100, and then applying the sealant can further prevent the substrate 107 and the back plate 101 from loosening and ink leakage, thereby improving product quality.

[0043] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. An electrophoretic display module, characterized in that: include: A back plate, the back plate comprising a first main body portion and a first protruding portion connected to each other, the first main body portion comprising a first reference surface, the first protruding portion being connected to the first reference surface, the first protruding portion comprising a plurality of blocking bars spaced apart along a first direction, two adjacent blocking bars and the first reference surface jointly defining a groove, the blocking bars extending along a second direction, any two of the first direction, the second direction and the vertical direction being perpendicular to each other; A substrate, the substrate is arranged above the back plate, the substrate comprises a second main body portion and a second protruding portion connected to each other, the second main body portion comprises a second reference surface, the second protruding portion is connected to the second reference surface, the second protruding portion comprises a stopper, a plurality of the stoppers are arranged in each groove, and the plurality of the stoppers arranged in the same groove are spaced apart along the second direction, the groove, two adjacent stoppers arranged in the same groove and the second reference surface jointly define a pixel grid; Electrophoretic ink, the electrophoretic ink is arranged in the pixel grid.

2. The electrophoretic display module according to claim 1, characterized in that: The first main body portion is provided with a receiving groove, the bottom wall of the receiving groove is the first reference surface, and along the second direction, the length of the receiving groove is greater than the length of the blocking bar.

3. The electrophoretic display module according to claim 1, characterized in that: The distance between two adjacent baffles is L1, 0.1mm≤L1≤0.5mm; And / or, along the second direction, the distance between two adjacent blocks is L2, 0.1≤L2≤0.5 mm.

4. The electrophoretic display module according to claim 1, characterized in that: The material of the backplane is a thin film transistor, and / or the material of the substrate is indium tin oxide.

5. The electrophoretic display module according to claim 1, characterized in that: The blocking bar extends straightly along the second direction, the side surface of the blocking bar is a plane, and the shape of the blocking block is a cuboid or a cube.

6. A method for preparing an electrophoretic display module, characterized in that: The preparation method comprises the following steps: Processing the first plate into a back plate, the back plate comprising a first main body portion and a first protruding portion connected to each other, the first main body portion comprising a first reference surface, the first protruding portion being connected to the first reference surface, the first protruding portion comprising a plurality of blocking bars spaced apart along a first direction, adjacent blocking bars and the first reference surface forming a groove together, the blocking bars extending along a second direction, any two of the first direction, the second direction and the vertical direction being perpendicular to each other; Processing the second plate into a base plate, the base plate comprising a second main body portion and a second protruding portion connected to each other, the second main body portion comprising a second reference surface, the second protruding portion being connected to the second reference surface, and the second protruding portion comprising a stopper; placing electrophoretic ink in the groove; The substrate is pressed onto the backplane so that: the block is arranged in the groove, and a plurality of the blocks arranged in the same groove are spaced apart along the second direction, and the groove, two adjacent blocks arranged in the same groove and the second reference plane jointly define a pixel grid, so that the pixel grid contains the electrophoretic ink.

7. The preparation method according to claim 6, characterized in that: Processing the first plate into the back plate comprises the following steps: Spin-coating photoresist on the upper surface of the first plate, and etching a plurality of blocking strips spaced apart along the first direction and extending along the second direction on the upper surface of the first plate using a mask photolithography process to form the first protrusion; and / or, Processing the second plate into a substrate comprises the following steps: Spin-coat photoresist on the lower surface of the second plate, and use a mask photolithography process to etch a plurality of stoppers spaced apart along the first direction and the second direction on the lower surface of the second plate to form the second protrusion.

8. The preparation method according to claim 6, characterized in that: Processing the second plate into the substrate comprises the following steps: The second plate is processed into the second main body, thermoplastic plastic is coated on the second reference surface, and the plastic is hot-pressed using a hot-pressing mold to form the second protrusion on the second reference surface after the plastic is cooled.

9. The preparation method according to claim 6, characterized in that: The second body portion is flexible, and the step of placing the electrophoretic ink in the groove comprises the following steps: Dropping the electrophoretic ink on one end of the groove along the second direction; Taking the end of the groove dripping with the electrophoretic ink as the starting end, one end of the substrate is pressed against the starting end; The substrate is gradually pressed onto the back plate along the second direction so that the electrophoretic ink flows from the starting end to the other end of the groove.

10. The preparation method according to claim 6, characterized in that: Gradually pressing the substrate onto the backplane along the second direction further comprises the following steps: Placing a pressing roller on the surface of the substrate opposite to the back plate, wherein the length of the pressing roller along the first direction is greater than the length of the substrate, and the pressing roller is placed at the end of the substrate that is first pressed onto the back plate; The pressing roller is driven to roll along the second direction.

11. The preparation method according to claim 6, characterized in that: After the substrate is pressed onto the backplane, the preparation method further comprises the following steps: The electrophoretic ink overflowing from the back plate and the substrate is wiped off, and a sealant is applied to the edge of the substrate to seal the substrate and the back plate.

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