Method for manufacturing an anti-halo cover plate

Abstract

The application discloses a manufacturing method of an anti-halo cover plate, and comprises the following steps: forming an auxiliary processing layer in a display area of a cover plate substrate, printing at least two ink layers in a frame decoration area, covering an overprint offset area in the inner edge of the ink layer on the auxiliary processing layer, and then removing the part of the ink to realize zero overprint tolerance alignment of the inner edge of the ink layer. The auxiliary processing layer can be a peelable adhesive layer, a removable photoresist layer or a low surface energy transparent film layer; or the inner edge of the ink layer can be directly trimmed by laser. The application effectively eliminates the halo phenomenon generated by the overprint offset of the frame ink of the cover plate under front light irradiation, improves the display visual quality, and has strong process compatibility and controllable cost.

Description

Technical Field

[0001] This invention relates to the field of reflective display device technology, and in particular to a method for manufacturing an anti-halo cover plate. Background Technology

[0002] Currently, various consumer e-book or e-paper products on the market use reflective display devices to display images. These devices use incident light from above to illuminate the display screen and achieve the display purpose. Reflective display devices can rely on external light sources in bright environments, but in environments with weak external light sources, they cannot display images clearly. Therefore, a front light module needs to be installed above the display panel of the reflective display device to provide sufficient light to the display panel so that users can easily view the screen.

[0003] Existing front light module display devices, such as Figure 1-3 As shown, the cross-sectional view A-A' includes a reflective display, a light guide plate, a light source, and a light-transmitting protective cover with a decorative border area. Optical adhesive is used to bond the light guide plate to the light-transmitting protective cover with the decorative border area. It can also be combined with a touch module, such as... Figure 3 As shown, the positions of the light guide plate and the touch module can be interchanged due to design requirements.

[0004] The surface of the light guide plate includes at least one light-emitting area and an edge area surrounding the light-emitting area. The light source is used to illuminate the light guide plate, and the light is transmitted through the dot microstructure of the light guide plate, so that the light is evenly distributed on the light guide plate. When the light passes through the light-transmitting protective cover, the ink thickness of the edge ink printing offset area is insufficient and the light-blocking effect is poor, which will produce a halo. Summary of the Invention

[0005] The purpose of this invention is to provide a method for manufacturing an anti-halo cover plate, which performs zero-tolerance processing on the ink in the overprinting offset area, solves the halo problem generated when the light guide plate and the light-transmitting protective cover plate are combined, and improves the visual quality of the display.

[0006] The technical solution adopted in this invention is:

[0007] A method for manufacturing an anti-halo cover includes the following steps:

[0008] A cover plate substrate is provided, the cover plate substrate having a display area and a border decorative area surrounding the display area;

[0009] An auxiliary processing layer is formed in the display area on one surface of the cover plate substrate;

[0010] At least two ink layers are printed on the border decoration area of ​​one surface of the cover plate substrate, wherein the two ink layers form a printing offset area at the inner edge of the adjacent display area, and the ink of the printing offset area covers the auxiliary processing layer.

[0011] Remove the ink covering the auxiliary processing layer so that the inner edges of at least two ink layers are aligned to form zero overprint tolerance.

[0012] Furthermore, the auxiliary processing layer is a removable layer; the step of removing the ink covering the auxiliary processing layer specifically involves removing the auxiliary processing layer and removing the ink covering it.

[0013] Furthermore, the removable layer is a peelable adhesive layer or a photoresist layer;

[0014] The peelable adhesive layer is formed by screen printing, coating or pasting, and can be removed by peeling, alkaline solution dissolution or hot water dissolution.

[0015] The photoresist layer is formed in the display area by screen printing, slot coating or spin coating. Then, the photoresist in the border decoration area is removed by exposure and development, leaving only the photoresist layer in the display area. After the ink layer is printed, the photoresist layer in the display area is removed by dissolving it with an alkaline solution, and the ink covering it is also removed.

[0016] Furthermore, the auxiliary processing layer is a low surface energy transparent film layer; the step of removing the ink covering the auxiliary processing layer specifically involves: using the low adhesion of ink to the surface of the low surface energy transparent film layer to remove the ink covering it.

[0017] Furthermore, the surface energy of the low surface energy transparent film layer is less than 30 dynes, or its contact angle with water is greater than 40 degrees.

[0018] Furthermore, the main material components of the low surface energy transparent film layer include any one of fluorinated compounds, organosilicon compounds, silicone, parylene, polypropylene, polyethylene, and polyurethane.

[0019] Furthermore, the auxiliary processing layer is formed on the front or back of the cover plate substrate;

[0020] When the auxiliary treatment layer is formed on the front side of the cover plate substrate, after the step of removing the ink covering the auxiliary treatment layer, the method further includes: forming an optical planarization layer on the ink layer.

[0021] Furthermore, the cover plate substrate is a transparent sheet, which is a glass plate or a plastic plate. The plastic plate is made of any one of PMMA, PET, PC, PS, PMMA / PC blend, MS, TAC, PE, PP, PVC, ABS, AS, CA, TPX, ADC, and PU; or a composite material of plastic and glass fiber. The thickness of the cover plate substrate is 0.01 mm to 10 mm.

[0022] A method for manufacturing an anti-halo cover includes the following steps:

[0023] A cover plate substrate is provided, the cover plate substrate having a display area and a border decorative area surrounding the display area;

[0024] At least two ink layers are printed on the border decoration area of ​​a surface of the cover plate substrate, wherein the at least two ink layers form a set of offset areas adjacent to the inner edge of the display area;

[0025] Laser is used to remove ink from the misregistration area, so that the inner edges of at least two ink layers are aligned, forming zero misregistration tolerance.

[0026] Furthermore, the laser is any one of CO2 laser, fiber laser, UV violet laser, green laser, or infrared laser.

[0027] The present invention adopts the above technical solution and has the following beneficial technical effects:

[0028] By performing zero-overprint tolerance processing on the ink layer of the decorative area of ​​the cover plate frame, the uneven ink thickness caused by overprinting misalignment at the edge of the display area due to multi-layer ink printing is completely eliminated. This effectively solves the problem of halo effect in this area under front light module illumination, which interferes with vision and significantly improves the display quality and user comfort of the reflective display device. Attached Figure Description

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments;

[0030] Figure 1 This is a plan view of a front-light display device in the prior art;

[0031] Figure 2 This is a cross-sectional view of a front-light display device in the prior art;

[0032] Figure 3 This is a cross-sectional view of a front-light display device with a touch module in the prior art;

[0033] Figure 4 This is a schematic diagram of Embodiment 1 of the anti-halo cover manufacturing method of the present invention;

[0034] Figure 5 This is a schematic diagram of Embodiment 2 of the anti-halo cover manufacturing method of the present invention;

[0035] Figure 6 This is a schematic diagram of Embodiment 3 of the anti-halo cover manufacturing method of the present invention;

[0036] Figure 7 This is a schematic diagram of Embodiment 4 of the anti-halo cover manufacturing method of the present invention;

[0037] Figure 8 This is a schematic diagram of Embodiment 5 of the anti-halo cover manufacturing method of the present invention;

[0038] Figure 9 This is a schematic diagram of Embodiment 6 of the anti-halo cover manufacturing method of the present invention;

[0039] Figure 10 This is a schematic diagram of the present invention applied to a front-light display device, embodiment 1;

[0040] Figure 11 This is a schematic diagram of the present invention applied to a front-light display device in embodiment 2 (with a low surface energy transparent film layer);

[0041] Figure 12 This is a schematic diagram of the present invention applied to a front-light display device, embodiment 3;

[0042] Figure 13 This is a schematic diagram of the present invention applied to a front-light display device in embodiment 4 (with a low surface energy transparent film layer);

[0043] Figure 14 This is a schematic diagram of the present invention applied to a front-light display device, embodiment 5;

[0044] Figure 15 This is a schematic diagram of the present invention applied to a front-light display device, embodiment 6 (with a low surface energy transparent film layer);

[0045] Figure 16 This is a schematic diagram of the present invention applied to a front-light display device, embodiment 7;

[0046] Figure 17 This is a schematic diagram of the present invention applied to an embodiment 8 of a front-light display device (with a low surface energy transparent film layer);

[0047] Figure 18 This is a schematic diagram of the present invention applied to a front-light display device, embodiment 9;

[0048] Figure 19 This is a schematic diagram of the present invention applied to a front-light display device embodiment 10 (with a low surface energy transparent film layer);

[0049] Figure 20 This is a schematic diagram of the present invention applied to an embodiment 11 of a front-light display device;

[0050] Figure 21 This is a schematic diagram of the present invention applied to a front-light display device embodiment 12 (with a low surface energy transparent film layer);

[0051] Figure 22 This is a schematic diagram of the present invention applied to a front-light display device, embodiment 13;

[0052] Figure 23 This is a schematic diagram of the present invention applied to a front light display device embodiment 14 (with a low surface energy transparent film layer). Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0054] Example 1, please refer to Figure 4 This embodiment provides a method for manufacturing an anti-halo cover, including the following steps:

[0055] First, a cover plate substrate is provided. The cover plate substrate is a transparent sheet, such as a glass plate or a plastic plate, with a thickness between 0.01 mm and 10 mm. The cover plate substrate has a display area and a border decorative area surrounding the display area. In this embodiment, the process is performed on the back side of the cover plate substrate.

[0056] On the back of the cover plate substrate, an auxiliary treatment layer is formed within the display area by screen printing, coating, or attachment. This auxiliary treatment layer is removable, specifically a peelable adhesive layer. The material of the peelable adhesive layer can be acrylic copolymer, polyurethane, rubber, or silicone, etc.

[0057] Then, at least two ink layers are sequentially printed in the bezel decoration area on the back of the cover plate substrate, for example, first printing the bezel decoration ink and then printing the light-shielding ink. During the printing process, due to the existence of registration tolerance, each ink layer will form a registration offset area at the inner edge of the adjacent display area. The ink in the registration offset area covers the peelable adhesive layer formed in the previous step.

[0058] Next, the peelable adhesive layer is removed from the cover plate substrate manually or mechanically, or dissolved and removed using an alkaline solution of 0.1% or higher or hot water above 40°C. During the removal of the peelable adhesive layer, the ink covering it (i.e., the ink in the misregistration area) is also removed. Thus, the inner edge of the ink layer remaining on the border decoration area no longer has any misregistration residue, resulting in a perfectly aligned and flat state, achieving zero misregistration tolerance.

[0059] Example 2, please refer to Figure 5 The main difference between this embodiment and Embodiment 1 is that the auxiliary processing layer is formed on the front side of the cover plate substrate, and an optical planarization layer is added on the ink layer after removing the ink in the overprinting offset area.

[0060] The specific steps are as follows: A cover plate substrate is provided, and a peelable adhesive layer is formed within the display area on its front side. Then, border decoration ink and light-blocking ink are printed in the front border decoration area, so that the ink in the misalignment area covers the peelable adhesive layer. After removing the peelable adhesive layer and the ink on it, an ink layer with aligned inner edges is obtained. Since the ink layer is located on the front side of the cover plate substrate and is directly in contact with the user, to avoid ink steps affecting the feel or appearance, an optically planarizing layer is coated on the ink layer in the border decoration area to form an overall smooth surface on the cover plate.

[0061] When a photoresist layer is selected as the auxiliary processing layer, the photoresist layer is formed in the display area by screen printing, slot coating, or spin coating. The photoresist outside the display area is removed by exposure and development, leaving only the photoresist layer in the display area. After the ink printing is completed, the photoresist layer in the display area is removed by dissolving it with an alkaline solution of 0.1% or higher, while also removing the ink covering it.

[0062] Example 3, please refer to Figure 6 In this embodiment, a low surface energy transparent film layer is used as an auxiliary processing layer, and this film layer is not removed; only the ink covering it is removed. This embodiment specifically includes the following steps:

[0063] A cover plate substrate is provided, and a low surface energy transparent film layer is formed in the display area on its back side. The surface energy of the low surface energy transparent film layer is less than 30 dynes, or its contact angle with water is greater than 40 degrees. The main components of the material can be selected from fluorinated compounds, organosilicon compounds, silicone, parylene, polypropylene, polyethylene, polyurethane, etc. The formation method can be vapor deposition, coating, or plasma treatment, etc.

[0064] Then, a border decoration ink layer and a light-shielding ink layer are printed on the border decoration area on the back of the cover plate substrate. Due to the low surface energy of the display area, the ink adhesion on it is extremely weak.

[0065] The removal process then proceeds: the ink covering the low surface energy transparent film layer is easily removed using liquid rinsing (such as water or alcohol solvents) or adhesive methods (such as tape removal). The low surface energy transparent film layer itself remains on the cover plate substrate, as part of the cover plate. After removal, the inner edge of the ink layer in the border decoration area is aligned with the boundary of the display area, forming zero registration tolerance.

[0066] Example 4, please refer to Figure 7 In this embodiment, a low surface energy transparent film layer is formed on the front display area of ​​the cover plate substrate, then ink is printed in the front bezel decoration area, the ink covering the low surface energy transparent film layer is removed, and finally an optical planarization layer is formed on the ink layer in the bezel decoration area. Other steps are the same as in Embodiment 3.

[0067] Example 5, please refer to Figure 8This embodiment does not use an auxiliary processing layer, but directly uses a laser to remove the ink from the overprinting misalignment area. This embodiment specifically includes the following steps:

[0068] A cover plate substrate is provided, on which at least two ink layers are directly printed on the border decoration area on the back side. Due to printing tolerances, there is an overprinting offset area at the inner edge of each ink layer extending into the display area.

[0069] Then, a laser is used to scan along the boundary between the display area and the bezel decoration area to precisely remove ink from the misaligned areas. The laser type can be any of CO2 laser, fiber laser, UV laser, green laser, or infrared laser, depending on the ink material. By controlling the laser power and focus, it is ensured that only excess ink is removed without damaging the cover plate substrate.

[0070] After laser treatment, the inner edges of the ink layer become aligned and flat, achieving zero overprinting tolerance.

[0071] Example 6, please refer to Figure 9 The only difference between this embodiment and Embodiment 5 is that: the ink layer is printed on the front border decorative area of ​​the cover plate substrate, and after the ink in the misaligned area is removed by laser, an optical planarization layer is formed on the ink layer to provide a smooth surface for use. The laser removal step is the same as in Embodiment 5.

[0072] In any of the above embodiments, the material of the cover plate substrate may be selected from any of the following: glass, polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polycarbonate (PC), polystyrene (PS), PMMA / PC blend, MS resin, cellulose triacetate (TAC), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene copolymer (ABS), acrylonitrile-styrene copolymer (AS), cellulose acetate (CA), poly-4-methyl-1-pentene (TPX), allyl diethylene glycol carbonate (ADC), polyurethane (PU), and composite materials of plastics and glass fibers.

[0073] The anti-halo cover plate manufactured by this invention can be applied to front-light display devices, and specific embodiments are as follows:

[0074] like Figure 10 As shown in Embodiment 1 of the front-light display device, in this embodiment, an ink layer (i.e., a border decorative ink layer and a light-shielding ink layer) is disposed on the back side of the cover plate substrate. A light guide plate and a reflective display are sequentially connected to the back side of the cover plate substrate by optical adhesive.

[0075] like Figure 11As shown in Embodiment 2 of the front-light display device, this embodiment has an ink layer (i.e., a border decorative ink layer and a light-shielding ink layer) and a low surface energy transparent film layer disposed on the back of the cover plate substrate. A light guide plate and a reflective display are sequentially connected to the back of the cover plate substrate by optical adhesive.

[0076] like Figure 12 As shown, in Embodiment 3 of the front light display device, this embodiment... Figure 10 A touch module has been added to the existing embodiment, and the touch module is connected between the cover plate substrate and the light guide plate by optical adhesive.

[0077] like Figure 13 As shown, in Embodiment 4 of the front light display device, this embodiment... Figure 11 A touch module has been added to the existing embodiment, and the touch module is connected between the cover plate substrate and the light guide plate by optical adhesive.

[0078] like Figure 14 As shown in Embodiment 5 of the front-light display device, this embodiment also includes a touch module, but the contact position of the touch module is different from that of the front-light display device. Figure 12 Unlike other touch modules, the touch module is connected between the light guide plate and the reflective display via optical adhesive.

[0079] like Figure 15 As shown in Embodiment 6 of the front-light display device, this embodiment also includes a touch module, but the contact position of the touch module is different from that of the front-light display device. Figure 13 Unlike other touch modules, the touch module is connected between the light guide plate and the reflective display via optical adhesive.

[0080] like Figure 16 As shown in Embodiment 7 of the front-light display device, an ink layer is disposed on the front side of the cover plate substrate, and an optical planarization layer is formed on the ink layer. A light guide plate and a reflective display are sequentially connected to the back side of the cover plate substrate by optical adhesive.

[0081] like Figure 17 As shown in Embodiment 8 of the front-light display device, an ink layer and a low surface energy transparent film layer are disposed on the front side of the cover plate substrate, and an optical planarization layer is formed on the ink layer and the low surface energy transparent film layer. A light guide plate and a reflective display are sequentially connected to the back side of the cover plate substrate by optical adhesive.

[0082] like Figure 18 As shown, in Embodiment 9 of the front light display device, this embodiment... Figure 16 A touch module has been added to the existing embodiment, and the touch module is connected between the cover plate substrate and the light guide plate by optical adhesive.

[0083] like Figure 19 As shown, in Embodiment 10 of the front light display device, this embodiment... Figure 17A touch module has been added to the existing embodiment, and the touch module is connected between the cover plate substrate and the light guide plate by optical adhesive.

[0084] like Figure 20 As shown, in Embodiment 11 of the front light display device, this embodiment... Figure 16 A touch module is added to the existing embodiment, but the touch module is connected between the light guide plate and the reflective display via optical adhesive.

[0085] like Figure 21 As shown, in Embodiment 12 of the front light display device, this embodiment... Figure 17 A touch module is added to the existing embodiment, but the touch module is connected between the light guide plate and the reflective display via optical adhesive.

[0086] like Figure 22 As shown, in Embodiment 13 of the front light display device, this embodiment... Figure 16 Based on the previous embodiment, a touch module has been added. In this embodiment, the touch circuitry is directly fabricated on the back of the cover plate substrate to form the touch module.

[0087] like Figure 23 As shown, in embodiment 14 of the front light display device, this embodiment... Figure 17 Based on the previous embodiment, a touch module has been added. In this embodiment, the touch circuitry is directly fabricated on the back of the cover plate substrate to form the touch module.

[0088] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Without conflict, the embodiments and features described and illustrated herein can be combined with each other. The components of the embodiments of the present invention generally described and illustrated in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A method for manufacturing an anti-halo cover, characterized in that: Includes the following steps: A cover plate substrate is provided, the cover plate substrate having a display area and a border decorative area surrounding the display area; An auxiliary processing layer is formed in the display area on one surface of the cover plate substrate; At least two ink layers are printed in the border decoration area on one surface of the cover plate substrate, wherein the ink layers form a printing offset area on the inner edge of the adjacent display area, and the ink of the printing offset area covers the auxiliary processing layer. Remove the ink covering the auxiliary processing layer so that the inner edges of at least two ink layers are aligned to form zero overprint tolerance.

2. The method for manufacturing an anti-halo cover plate according to claim 1, characterized in that: The auxiliary processing layer is a removable layer; the specific steps for removing the ink covering the auxiliary processing layer are: removing the auxiliary processing layer and removing the ink covering it.

3. The method for manufacturing an anti-halo cover plate according to claim 2, characterized in that: The removable layer is a peelable adhesive layer or a photoresist layer; The peelable adhesive layer is formed by screen printing, coating or pasting, and can be removed by peeling, alkaline solution dissolution or hot water dissolution. The photoresist layer is formed in the display area by screen printing, slot coating or spin coating. Then, the photoresist in the border decoration area is removed by exposure and development, leaving only the photoresist layer in the display area. After the ink layer is printed, the photoresist layer in the display area is removed by dissolving it with an alkaline solution, and the ink covering it is also removed.

4. The method for manufacturing an anti-halo cover plate according to claim 1, characterized in that: The auxiliary processing layer is a low surface energy transparent film layer; The specific steps for removing the ink covering the auxiliary treatment layer are as follows: the ink is removed by utilizing the low adhesion of the ink to the surface of the low surface energy transparent film layer.

5. The method for manufacturing an anti-halo cover plate according to claim 4, characterized in that: The surface energy of the low surface energy transparent film is less than 30 dynes, or its contact angle with water is greater than 40 degrees.

6. The method for manufacturing an anti-halo cover plate according to claim 5, characterized in that: The main components of the low surface energy transparent film layer include any one of fluorine-containing compounds, organosilicon compounds, silicone, parylene, polypropylene, polyethylene, and polyurethane.

7. A method for manufacturing an anti-halo cover according to any one of claims 1 to 6, characterized in that: The auxiliary treatment layer is formed on the front or back of the cover plate substrate; When the auxiliary treatment layer is formed on the front side of the cover plate substrate, after the step of removing the ink covering the auxiliary treatment layer, the method further includes: forming an optical planarization layer on the ink layer.

8. The method for manufacturing an anti-halo cover plate according to claim 1, characterized in that: The cover plate substrate is a transparent sheet, which is a glass plate or a plastic plate. The plastic plate is made of any one of PMMA, PET, PC, PS, PMMA / PC blend, MS, TAC, PE, PP, PVC, ABS, AS, CA, TPX, ADC, and PU; or a composite material of plastic and glass fiber. The thickness of the cover plate substrate is 0.01 mm to 10 mm.

9. A method for manufacturing an anti-halo cover, characterized in that: Includes the following steps: A cover plate substrate is provided, the cover plate substrate having a display area and a border decorative area surrounding the display area; At least two ink layers are printed on the border decoration area of ​​one surface of the cover plate substrate, wherein the ink layers form a set of offset areas on the inner edge of the adjacent display area; Laser is used to remove ink from the misregistration area, so that the inner edges of at least two ink layers are aligned, forming zero misregistration tolerance.

10. A method for manufacturing an anti-halo cover plate according to claim 9, characterized in that: The laser is any one of CO2 laser, fiber laser, UV violet laser, green laser, or infrared laser.

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