VA display capable of eliminating high-temperature white spots and production process thereof

Abstract

The invention discloses a VA display capable of eliminating high-temperature white spots and a production process thereof, the structure of the VA display sequentially comprises an upper polaroid, upper ITO glass, a TOP layer, an upper PI layer, a liquid crystal layer, a lower PI layer, a lower TOP layer, lower ITO glass and a lower polaroid from top to bottom, the upper polaroid and the lower polaroid are provided with pressure-sensitive adhesive to be attached to the glass, the PI layer and the TOP layer are cured on each layer through printing, and the liquid crystal layer is arranged on the liquid crystal layer. The upper glass and the lower glass are bonded together through peripheral frame glue to form a cavity, liquid crystal is poured into the cavity in a vacuum mode, and finally a crystal pouring opening is sealed through sealing glue. The VA display prepared by the invention does not have a white spot phenomenon when working at a high temperature, and the production efficiency is improved compared with the VA display in the market.

Description

Technical Field

[0001] This invention relates to the improvement of high-temperature white spots on products and to the improvement of the friction strength of AV products, specifically a method for eliminating high-temperature white spots on VA products. Background Art

[0002] As the temperature of liquid crystal increases, it will change towards a liquid state. When the temperature reaches the clearing point of the liquid crystal, the liquid crystal will completely turn into a liquid and lose its original properties. This is a characteristic of liquid crystal and cannot be improved.

[0003] The current friction intensity meets the performance requirements of liquid crystal at room temperature. When the temperature rises, the liquid crystal undergoes slight changes, which cannot meet the directional requirements of the liquid crystal and the liquid crystal is not sufficiently twisted. Summary of the invention

[0004] In view of the defects existing in the above-mentioned prior art, the present invention discloses a VA display and a production process thereof for eliminating high-temperature white spots. The VA display prepared by the present invention does not have white spots when working at high temperatures, and has improved production efficiency compared with VA displays available on the market.

[0005] The present invention is implemented as follows: a VA display that eliminates high-temperature white spots, the structure is an upper polarizer, an upper ITO glass, a TOP layer, an upper PI layer, a liquid crystal layer, a lower PI layer, a lower TOP layer, a lower ITO glass, and a lower polarizer (wherein the upper and lower polarizers themselves have pressure-sensitive adhesives attached to the glass, the PI layer and the TOP layer are printed and solidified on each layer, the upper and lower glasses are bonded together by frame glue around to form a cavity, the liquid crystal is vacuum-infused in the cavity, and finally the crystal injection port is sealed with sealing glue). The production process of the VA display that eliminates high-temperature white spots is specifically as follows:

[0006] Step 1: The upper TOP layer is solidified on the upper ITO glass by printing;

[0007] Step 2: The upper PI layer is solidified on the upper TOP layer by printing;

[0008] Step 3: Place the upper ITO glass on a moving platform, and press down the roller covered with flannel cloth to rub the upper PI layer;

[0009] Step 4: attach the upper polarizer to the upper ITO glass to obtain an upper structure;

[0010] Step 5: Solidify the lower TOP layer on the lower ITO glass by printing;

[0011] Step 6: Curing the lower PI layer on the lower TOP layer by printing;

[0012] Step 7: Place the lower ITO glass on the moving platform, and press down the roller covered with flannel cloth to rub the lower PI layer;

[0013] Step 8: Attach the lower polarizer to the lower ITO glass to obtain the lower structure;

[0014] Step 9: Bond the upper ITO glass and the lower ITO glass to the upper structure and the lower structure through the surrounding frame glue to form a cavity, vacuum-infuse liquid crystal into the cavity, and finally seal the crystal injection port with sealing glue to obtain a VA display.

[0015] Furthermore, in step 3, the rotation speed of the roller is set to 800 rpm, the moving speed of the moving platform is set to 60 mm / s, and the gap between the roller and the upper ITO glass and the lower ITO glass (8) is set according to the pressing amount of 0.3 mm.

[0016] Further, in step 3, the friction strength formula is: Ni = D·M·(π·ω·d / v-1);

[0017] Among them, D is the amount of indentation, which affects the depth of the friction groove; M is the number of friction times; ω is the rotation speed of the friction roller, d is the diameter of the friction roller, and v is the friction speed (the roller moving speed or the platform moving speed); the M·(π·ω·d / v-1) affects the density of the friction groove, that is, the number of grooves rubbed out per unit area.

[0018] Furthermore, the production line layout in the process: two friction machines are arranged in series. Under normal production process, the product is directly rubbed twice. Without changing any process, the friction density is directly doubled; selecting the condition of v=60mm / s, the friction cycle is reduced from 35S to 30s, and the production efficiency is increased by 15%; the process selection: D=0.3mm, M=2, ω=800rpm, D=130mm, v=60mm / s, friction strength Ni=53.8, when the v value is selected at 60mm / s, the friction density is increased from 135 to 179.4.

[0019] Furthermore, the upper ITO glass and the lower ITO glass are respectively provided with ITO wiring, an upper TOP layer is printed below the upper ITO glass, an upper PI layer is printed below the upper TOP layer, a lower TOP layer 7 is printed above the lower ITO glass, and a lower PI layer is printed above the lower TOP layer. When the friction position is produced, Y-25-C flannel cloth is used for production, and the gap between the roller and the upper ITO glass and the lower ITO glass is set according to the pressing amount of 0.3mm, the rotation speed of the roller is set to 800rpm, the moving speed of the platform is set to 60mm / s, and friction is performed twice.

[0020] A VA display for eliminating high-temperature white spots of the present invention comprises, from top to bottom, an upper polarizer, an upper ITO glass, an upper TOP layer, an upper PI layer, a liquid crystal layer, a lower PI layer, a lower TOP layer, a lower ITO glass, and a lower polarizer; the upper polarizer is attached to the upper part of the upper ITO glass by a pressure-sensitive adhesive, the lower polarizer is attached to the lower part of the lower ITO glass by a pressure-sensitive adhesive, the upper PI layer is solidified below the upper ITO glass by printing, the upper TOP layer is solidified between the upper PI layer and the upper ITO glass by printing; the lower TOP layer is solidified above the lower ITO glass by printing, the lower PI layer is solidified above the lower TOP layer by printing, and the liquid crystal layer is arranged between the lower PI layer and the upper TOP layer; the upper polarizer absorption axis and the VA display transverse reference side have an angle of +45° or -45°; the lower polarizer absorption axis and the VA display transverse reference side have an angle of -45° or +45°;

[0021] The upper PI layer is a vertically oriented PI with a rubbing direction of 90° or -90°; the lower PI layer is a vertically oriented PI with a rubbing direction of 90° or -90°; the upper ITO glass and the lower ITO glass are bonded together with the surrounding frame glue to form a cavity, and the liquid crystal is vacuum-infused in the cavity, and finally the crystal filling port is sealed with sealing glue.

[0022] Furthermore, ITO wiring is arranged on the upper ITO glass and the lower ITO glass, and the overlapping part of the upper and lower ITO wiring is the display pattern.

[0023] Furthermore, the liquid crystal layer is a negative liquid crystal, Δε<0.

[0024] Furthermore, the upper polarizer and the lower polarizer are attached to the upper ITO glass and the lower ITO glass with pressure-sensitive adhesive, and the upper PI layer and the lower PI layer are respectively printed and solidified on the upper TOP layer and the lower TOP layer.

[0025] The beneficial effects of the present invention compared with the prior art are:

[0026] The friction of the present invention is to use a roller with flannel cloth attached to it, and rotate it at high speed on the glass on which the PI orientation layer has been printed on a moving platform, so that the fluff on the flannel cloth rubs out fine grooves with the same direction on the PI orientation layer, and the liquid crystal molecules are arranged and distributed in the grooves. Since the density of the fluff on the flannel cloth currently used is relatively low, and the length error of the fluff is relatively large, the friction strength will be uneven. To improve high-temperature white spots, it is necessary to strengthen the friction, which is generally achieved by reducing the moving speed during friction or reducing the gap between the roller and the glass. Reducing the speed will affect the production efficiency, and reducing the gap will produce relatively clear friction marks. The present invention can improve the friction strength without affecting the production efficiency or reducing the product quality.

[0027] The production process of the VA display of the present invention adopts a double friction method to improve the friction density. The VA display provided by the present invention does not have white spots at high temperatures. The friction is strengthened without affecting the production efficiency. The VA display product of the present invention does not have white spots when working at high temperatures, and the production efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of a VA display for eliminating high-temperature white spots;

[0029] Figure 2 A schematic diagram of a production process for a VA display that eliminates high-temperature white spots;

[0030] Among them, 1-upper polarizer, 2-upper ITO glass, 3-upper TOP layer, 4-upper PI layer, 5-liquid crystal layer, 6-lower PI layer, 7-lower TOP layer, 8-lower ITO glass, 9-lower polarizer, 10-frame, 11-roller. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail by enumerating examples below. It should be noted that the specific implementation described here is only used to explain the present invention and is not used to limit the present invention.

[0032] like Figure 1 As shown, the present invention discloses a VA display for eliminating high-temperature white spots, wherein the VA display comprises, from top to bottom, an upper polarizer 1, an upper ITO glass 2, an upper TOP layer 3, an upper PI layer 4, a liquid crystal layer 5, a lower PI layer 6, a lower TOP layer 7, a lower ITO glass 8, and a lower polarizer 9; the upper polarizer 1 is attached to the upper part of the upper ITO glass 2 by a pressure-sensitive adhesive, the lower polarizer 9 is attached to the lower part of the lower ITO glass 8 by a pressure-sensitive adhesive, the upper TOP layer 3 is solidified by printing on the lower part of the upper ITO glass 2, and the upper PI layer 4 is solidified by printing on the lower part of the upper TOP 3; the lower TOP layer 7 is solidified by printing on the upper part of the lower ITO glass 8, the lower PI layer 6 is solidified by printing on the upper part of the lower TOP layer 7, and the liquid crystal layer 5 is arranged between the lower PI layer 6 and the upper PI layer 4.

[0033] In the present invention, ITO wiring is arranged on the upper ITO glass 2 and the lower ITO glass 8, and the overlapping part of the upper and lower ITO wiring is the display pattern; regarding the upper polarizer 1, the angle between the absorption axis of the polarizer and the horizontal reference edge of the VA display is +45° or -45°; regarding the lower polarizer 9, the angle between the absorption axis of the polarizer and the horizontal reference edge of the VA display is -45° or +45°; the upper PI layer 4 is a vertically oriented PI, and its rubbing direction is 90° or -90°; the lower PI layer 6 is a vertically oriented PI, and its rubbing direction is 90° or -90°; the liquid crystal layer is a negative liquid crystal, △ε<0.

[0034] When the VA display of the present invention is produced, the upper and lower polarizers are attached to the glass with pressure-sensitive adhesive, the PI layer and the TOP layer are solidified on each layer by printing, the upper and lower glasses are bonded together by the surrounding frames 10 to form a cavity, the liquid crystal is vacuum-infused in the cavity, and finally the crystal filling port is sealed with sealing glue.

[0035] The production process of the VA display for eliminating high-temperature white spots of the present invention is specifically as follows:

[0036] Step 1: The upper TOP layer 3 is solidified on the upper ITO glass 2 by printing;

[0037] Step 2: The upper PI layer 4 is solidified on the upper TOP layer 3 by printing;

[0038] Step 3: Place the upper ITO glass 2 on the mobile platform, and press down the roller with a flannel cloth on the upper part to rub the upper PI layer 4; the rotation speed of the roller 11 is set to 800 rpm, the moving speed of the mobile platform is set to 60 mm / s, and the gap between the roller and the ITO glass is set according to the pressing amount of 0.3 mm; Figure 2 As shown;

[0039] Step 4: attaching the upper polarizer 1 to the upper ITO glass 2 to obtain an upper structure;

[0040] Step 5: solidify the lower TOP layer 7 on the lower ITO glass 8 by printing;

[0041] Step 6: Curing the lower PI layer 6 on the lower TOP layer 7 by printing;

[0042] Step 7: Place the lower ITO glass 8 on a moving platform, and press down a roller covered with flannel cloth on the upper part to rub the lower PI layer 6;

[0043] Step 8: attaching the lower polarizer 9 to the lower ITO glass 8 to obtain a lower layer structure;

[0044] Step 9: Bond the upper ITO glass 8 and the lower ITO glass 2 together by surrounding frame glue to form a cavity, vacuum-infuse liquid crystal into the cavity, and finally seal the crystal injection port with sealing glue to obtain a VA display.

[0045] The friction strength formula of the present invention is Ni=D·M·(π·ω·d / v-1), including D pressing amount, which mainly affects the depth of the friction groove, M is the number of friction times, ω is the rotation speed of the friction roller, d is the diameter of the friction roller, v is the friction speed (the roller moving speed or the platform moving speed), and M·(π·ω·d / v-1) mainly affects the density of the friction groove, that is, the number of grooves rubbed out per unit area. The production line layout adopts two friction machines arranged in series. Under the normal production process, the product will be directly rubbed twice. Without changing any process, the friction density is directly doubled. Selecting the condition of v=60mm / s, the friction beat is also reduced from 35S to 30s, and the production efficiency is increased by about 15%. Process selection: D=0.3mm, M=2, ω=800rpm, D=130mm, v=60mm / s, friction strength Ni=53.8. When the v value is selected as 60mm / s, the friction density is also increased from the original 135 to the current 179.4.

[0046] The upper and lower glass are respectively provided with ITO lines, the TOP layer is printed above the ITO lines, and the PI layer is printed above the TOP layer. When producing at the friction station, Y-25-C flannel is used. At the same time, the gap between the roller and the ITO glass is set according to the pressing amount of 0.3mm, the rotation speed of the roller is set to 800rpm, the moving speed of the platform is set to 60mm / s, and friction is performed twice.

[0047] The present invention provides a fast-response VA display and a production process thereof. There are many methods and approaches to implement the technical solution. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. A production process for a VA display for eliminating high-temperature white spots, characterized in that: The process is specifically as follows: Step 1: The upper TOP layer (3) is solidified on the upper ITO glass (2) by printing; Step 2: curing the upper PI layer (4) on the upper TOP layer (3) by printing; Step 3: placing the upper ITO glass (2) on a moving platform, and pressing down a roller covered with flannel cloth on the upper portion to rub the upper PI layer (4); Step 4: attaching the upper polarizer (1) to the upper ITO glass (2) to obtain an upper structure; Step 5: solidifying the lower TOP layer (7) on the lower ITO glass (8) by printing; Step 6: solidifying the lower PI layer (6) on the lower TOP layer (7) by printing; Step 7: Place the lower ITO glass (8) on a moving platform, and press down a roller covered with flannel cloth to rub the lower PI layer (6); Step 8: attaching the lower polarizer (9) to the lower ITO glass (8) to obtain a lower layer structure; Step 9: The upper ITO glass (2) and the lower ITO glass (8) are bonded together with the upper structure and the lower structure by using the surrounding frame glue to form a cavity, and the liquid crystal is vacuum-filled into the cavity. Finally, the crystal filling port is sealed with sealing glue to obtain a VA display.

2. The production process of a VA display for eliminating high-temperature white spots according to claim 1, characterized in that: In step 3, the rotation speed of the roller (11) is set to 800 rpm, the moving speed of the moving platform is set to 60 mm / s, and the gap between the roller and the upper ITO glass (2) and the lower ITO glass (8) is set according to the pressing amount of 0.3 mm.

3. The production process of a VA display for eliminating high-temperature white spots according to claim 1, characterized in that: In step 3, the friction strength formula is: Ni = D·M·(π·ω·d / v-1); Among them, D is the amount of indentation, which affects the depth of the friction groove; M is the number of friction times; ω is the rotation speed of the friction roller, d is the diameter of the friction roller, and v is the friction speed (the roller moving speed or the platform moving speed); the M·(π·ω·d / v-1) affects the density of the friction groove, that is, the number of grooves rubbed out per unit area.

4. The production process of a VA display for eliminating high-temperature white spots according to claim 3, characterized in that: Production line layout in the process: two friction machines are arranged in series. Under normal production process, the product is directly rubbed twice. Without changing any process, the friction density is directly doubled; when v=60mm / s is selected, the friction cycle is reduced from 35S to 30s, and the production efficiency is increased by 15%; process selection: D=0.3mm, M=2, ω=800rpm, D=130mm, v=60mm / s, friction strength Ni=53.8, when the v value is selected at 60mm / s, the friction density is increased from 135 to 179.

4.

5. The production process of a VA display for eliminating high-temperature white spots according to claim 1, characterized in that: The upper ITO glass (2) and the lower ITO glass (8) are respectively provided with ITO wiring, an upper TOP layer (3) is printed below the upper ITO glass (2), an upper PI layer (4) is printed below the upper TOP layer (3), a lower TOP layer 7 is printed above the lower ITO glass (8), and a lower PI layer (6) is printed above the lower TOP layer (7). During the production at the friction station, Y-25-C flannel is used for production, and at the same time, the gap between the roller and the upper ITO glass (2) and the lower ITO glass (8) is set according to the pressing amount of 0.3 mm, the rotation speed of the roller is set to 800 rpm, the moving speed of the platform is set to 60 mm / s, and the friction is performed twice.

6. A VA display prepared by the production process of a VA display for eliminating high-temperature white spots as claimed in any one of claims 1 to 5.

7. A VA display for eliminating high-temperature white spots according to claim 6, characterized in that: The VA display comprises, from top to bottom, an upper polarizer (1), an upper ITO glass (2), an upper TOP layer (3), an upper PI layer (4), a liquid crystal layer (5), a lower PI layer (6), a lower TOP layer (7), a lower ITO glass (8), and a lower polarizer (9); the upper polarizer (1) is attached to the upper part of the upper ITO glass (2) by means of a pressure-sensitive adhesive, the lower polarizer (9) is attached to the lower part of the lower ITO glass (8) by means of a pressure-sensitive adhesive, the upper PI layer (4) is printed and solidified on the lower part of the upper ITO glass (2), and the upper PI layer (6) is attached to the lower part of the lower ITO glass (8) by means of a pressure-sensitive adhesive. The OP layer (3) is solidified between the upper PI layer (4) and the upper ITO glass (2) by printing; the lower TOP layer (7) is solidified on the upper side of the lower ITO glass (8) by printing; the lower PI layer (6) is solidified on the upper side of the lower TOP layer (7) by printing; the liquid crystal layer (5) is arranged between the lower PI layer (6) and the upper TOP layer (3); the angle between the absorption axis of the upper polarizer (1) and the horizontal reference side of the VA display is +45° or -45°; the angle between the absorption axis of the lower polarizer (9) and the horizontal reference side of the VA display is -45° or +45°; The upper PI layer (4) is a vertically oriented PI, and its rubbing direction is 90° or -90°; the lower PI layer (6) is a vertically oriented PI, and its rubbing direction is 90° or -90°; The upper ITO glass (2) and the lower ITO glass (8) are glued together by the surrounding frames (10) to form a cavity, and the liquid crystal is vacuum-injected into the cavity, and finally the injection port is sealed with sealing glue.

8. The VA display for eliminating high temperature white spots according to claim 1, characterized in that: ITO wiring is arranged on the upper ITO glass (2) and the lower ITO glass (8), and the portion where the upper and lower ITO wiring overlap is the display pattern.

9. The VA display for eliminating high temperature white spots according to claim 1, characterized in that: The liquid crystal layer (5) is a negative liquid crystal, Δε<0.

10. The VA display for eliminating high-temperature white spots according to claim 1, characterized in that: The upper polarizer (1) and the lower polarizer (9) are attached to the upper ITO glass (2) and the lower ITO glass (8) with pressure-sensitive adhesive, and the upper PI layer (4) and the lower PI layer (6) are respectively printed and solidified on the upper TOP layer (3) and the lower TOP layer (7).

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