A method for making APR plates with reduced printing vibration

Abstract

The present invention provides a method for making an APR plate that reduces printing vibration, comprising the following steps: step S1, according to the position of the array arrangement of the photosensitive resin material blocks on the APR plate of the circuit design, defined as the first area, and in the blank space outside the first area and the position where there is no corresponding circuit arrangement, a plurality of supporting small blocks are evenly arranged, defined as the second area; step S2, coating the APR plate substrate with photosensitive material, exposing, developing and fixing the first area and the second area, and obtaining the APR plate, so that the APR plate is arrayed with photosensitive resin material blocks and a plurality of supporting small blocks. The APR plate prepared by the method of the present invention can effectively weaken the vibration in the rolling printing process, reduce the situation causing uneven thickness of the alignment film, and improve the product yield.

Description

Technical Field

[0001] The invention relates to the technical field of liquid crystal display, and in particular to a method for manufacturing an APR plate capable of reducing printing vibration. Background Art

[0002] At present, TFT-LCD panels are widely used in electronic products such as mobile phones, tablets, cars, and industrial control. In the TFT-LCD process, PI (polyimide) printing is an important step in the production of alignment films. PI not only has good insulation performance and hardness, but also is resistant to high and low temperatures. As an alignment film, it can make liquid crystal molecules have different pre-tilt angles.

[0003] Traditional LCD panels can be divided into different generations of factories according to their size, and the production process also varies from generation to generation. Among them, the G6 (1850mm*1500mm) generation factory basically adopts a printing mode that uses an APR plate to print the alignment film used to provide liquid crystal tilt and part of the capacitance environment in the LCD display panel on TFT (stripping transistor) and CF (color filter). In this printing process, only the display area of ​​the panel needs to be coated with an alignment film. Since the circuits on the TFT glass are used for conduction and cannot be coated with an alignment film, the APR plate needs to be designed with a circuit area hollowed out for the product, resulting in an APR plate with an array-arranged photosensitive resin material block. This causes the APR plate to vibrate at the rear printing end when it is rolled to this point, such as Figure 1 As shown, uneven thickness of the alignment film results in lateral uneven Mura, which reduces product quality. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an APR plate manufacturing method that reduces printing vibration, so as to overcome the problem of uneven thickness of the alignment film caused by vibration in the existing rolling printing process and improve the product yield.

[0005] The problem of the present invention is achieved as follows: A method for making an APR plate for reducing printing vibration comprises the following steps:

[0006] Step S1, according to the arrangement position of the photosensitive resin material block array on the circuit design APR board, a first area is defined, and a plurality of supporting small blocks are evenly arranged in the blank area outside the first area and where there is no corresponding circuit arrangement, which is defined as a second area;

[0007] Step S2, coating a photosensitive material on the APR plate substrate, exposing, developing and fixing the first area and the second area to obtain an APR plate, so that the APR plate has photosensitive resin material blocks and a plurality of supporting small blocks arranged in an array.

[0008] Preferably, the substrate is a double-layer PET structure.

[0009] Preferably, the width of the supporting block is greater than 2 mm.

[0010] Preferably, the photosensitive resin material block and the supporting small block are both 780 um thick.

[0011] Preferably, the width of the APR plate is 1500 mm, and the cumulative width of the supporting blocks arranged in the width direction of the APR plate is greater than 100 mm.

[0012] The advantages of the present invention are: adding a support design to the original APR plate can effectively reduce the vibration of the rolling printing process, reduce the lateral uneven Mura caused by the vibration, and reduce the related defect rate from 76% to 0%, thereby greatly improving the defect rate and improving the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0014] Figure 1 It is a schematic diagram of the printing effect and corresponding printing process in the G6 printing process in the existing design.

[0015] Figure 2 The present invention is a flowchart of an APR plate manufacturing method for reducing printing vibration.

[0016] Figure 3 The present invention is a schematic diagram of the structure of an APR plate obtained by adopting a method for manufacturing an APR plate for reducing printing vibration according to the present invention.

[0017] Figure 4 This is a data analysis table for experiments using the old design APR version.

[0018] Figure 5 This is a data analysis table for experiments using the newly designed APR version of the method of the present invention. DETAILED DESCRIPTION

[0019] like Figure 2 and Figure 3 As shown, a method for making an APR plate for reducing printing vibration of the present invention comprises:

[0020] Step S1, according to the arrangement position of the photosensitive resin material blocks on the APR board of the circuit design, a first area is defined, and a plurality of supporting small blocks are evenly arranged in the blank space outside the first area and the position without corresponding circuit arrangement, which is defined as the second area. The second area is a non-circuit arrangement area, generally a cross intersection of the blank position; since the hollowing design is mainly due to the circuit arrangement, most of the blank positions correspond to the circuit arrangement. For the scattered positions without circuit arrangement, we designed supporting small blocks to support the entire hollowing area, and at the same time, the scattered positions in different corners can also achieve a uniform support effect.

[0021] Step S2, coating a photosensitive material on the APR plate substrate 1, exposing, developing and fixing the first area and the second area to obtain an APR plate, so that the APR plate is arrayed with photosensitive resin material blocks 2 and a plurality of supporting small blocks 3. The photosensitive resin material is unsaturated polybutadiene resin.

[0022] Preferably, the bottom layer is a double-layer PET (polyethylene glycol terephthalate) structure.

[0023] Preferably, the width of the support block is greater than 2 mm. Through experiments, we found that when the width of the support block is less than 2 mm, the support object may be deformed and fall due to being too narrow and not stable enough.

[0024] Preferably, the photosensitive resin material block and the supporting small block are both 780 um thick.

[0025] Preferably, the width H of the APR plate is 1500mm, and the cumulative width of the small support blocks arranged in the width direction of the APR plate is greater than 100mm. In the G6 printing process, the glass size is 1850×1500, and the APR plate printing area is 1850×1500. Through experiments, we found that when the cumulative width of the small support blocks at the hollowed-out part is greater than 100mm, the effect of supporting and reducing vibration is better.

[0026] In order to verify the effect of the present invention, corresponding experimental tests were carried out. The experimental results are as follows: Figure 4 and Figure 5 As shown, Figure 4 The result of printing on the traditional conventional APR version (i.e. the old design) is Figure 5 This is the result of printing on the APR plate prepared by the method of the present invention, in which the defect of vibration mura is Hor mura (i.e., lateral unevenness or longitudinal unevenness, which is specifically related to the product arrangement mode). Figure 4 and Figure 5The S and A products in the above represent good products, and the sum of these two divided by the corresponding total number of lightings is the yield. We found that the Hor mura defect in the old design reached 76%, while the APR version (i.e., the new design) made by the method of the present invention no longer has the Hor mura defect code in the lighting defects, but only some conventional foreign matter and other defect codes. The number of lightings above means that after our products are made, we will take out a whole G6 large board to light it to see if there are any defects. The number of lights represents how many pieces are lit. The yield represents the yield of this piece of product. Each row under the ranking in the table represents a defective code and its proportion. If we only look at the vibration mura performance, we will find that the yield rate of the APR version printed with the old design is 0%, and the defective Hor mura (which is caused by the vibration mentioned in the article) reaches 76%. The yield rate of the newly designed APR version is 73%. The Hor mura caused by the vibration mentioned in the article is no longer in the defective codes printed by the newly designed APR version. We tracked the cumulative printing of 10,000 pieces of the newly designed APR version and found that the yield rate was stable without abnormalities, which met the design requirements, indicating that this defect has been effectively improved.

[0027] Since the G6 process is all printed with APR plates, the printing process is the same. Currently, the industry has Mura caused by vibration. We redesigned and produced the APR plate, and added support design to the line Dummy when designing the APR plate, so that the APR plate has support when rolling and printing to the original line hollowing area, slowing down the vibration, thereby achieving the degree of reducing the uneven film thickness, and showing no Mura defects in the product, improving the quality of the product, which can be applied to the improvement of the vibration problem in the industry.

[0028] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A method for making an APR plate for reducing printing vibration, characterized in that: The steps include: Step S1, according to the position of the photosensitive resin material block array arrangement on the circuit design APR board, defined as the first area, and in the blank area outside the first area and where there is no corresponding circuit arrangement, a plurality of supporting small blocks are evenly arranged, defined as the second area; Step S2, coating a photosensitive material on the APR plate substrate, exposing, developing and fixing the first area and the second area to obtain an APR plate, so that the APR plate has photosensitive resin material blocks and a plurality of supporting small blocks arranged in an array.

2. The method for making an APR plate for reducing printing vibration according to claim 1, characterized in that: The substrate is a double-layer PET structure.

3. The method for making an APR plate for reducing printing vibration according to claim 1, characterized in that: The width of the supporting block is greater than 2 mm.

4. The method for making an APR plate for reducing printing vibration according to claim 1, characterized in that: The photosensitive resin material block and the supporting small block are both 780um thick.

5. The method for making an APR plate for reducing printing vibration according to claim 1, characterized in that: The width of the APR plate is 1500 mm, and the cumulative width of the supporting blocks arranged in the width direction of the APR plate is greater than 100 mm.

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