APR plate
By setting support blocks on the APR plate, the vibration problem during the printing process was solved, the uniformity of the alignment film thickness was achieved, and the product quality and yield were improved.
Patent Information
- Application Number
- CN202520111500.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2035-01-17
AI Technical Summary
During the printing process of TFT-LCD liquid crystal panels, the vibration of the APR plate causes uneven thickness of the alignment film, which affects product quality and yield.
Design an APR plate comprising a base layer and an array of photosensitive resin material blocks. Support blocks are provided in the gaps between the photosensitive resin material blocks. The thickness of the support blocks is the same as that of the photosensitive resin material blocks. The base layer is a double-layer PET structure. The width of the support blocks is greater than 2mm, and the cumulative width is greater than 100mm. They are located in non-circuit layout areas.
It effectively reduced vibration during the roll printing process, reduced unevenness in the alignment film thickness, and improved product yield, reducing it from 76% to 0%.
Smart Images
Figure CN223650890U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of liquid crystal display technology, and in particular to an APR version. Background Technology
[0002] Currently, TFT-LCD panels are widely used in electronic products such as mobile phones, tablets, automotive displays, and industrial control systems. In the TFT-LCD manufacturing process, PI (polyimide) printing is an important step in the production of alignment films. PI not only has good insulation properties and hardness, but also withstands high and low temperatures. As an alignment film, it allows liquid crystal molecules to have different pretilt angles.
[0003] Traditional LCD panel manufacturers can be categorized by size into different generations, each with its own manufacturing process. The G6 (1850mm*1500mm) generation typically uses an APR (Adjustable Partial Reflection) plate to print the alignment film—which provides the tilt angle and partial capacitance environment for the liquid crystal—onto the TFTs (Thin Film Transistors) and CFs (Color Filters). In this printing process, only the display area needs alignment film coating. Since the circuitry on the TFT glass is used for conduction and cannot be coated with alignment film, the APR plate requires a cut-out design for the circuitry area, resulting in an APR plate with an array of photosensitive resin material blocks. Figure 2 As shown, this causes the printing plate to vibrate at the printing end when it reaches this point in the rolling print, as... Figure 1 This leads to uneven alignment film thickness, forming transverse unevenness (Mura), which reduces product quality. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide an APR plate to overcome the uneven thickness of the alignment film caused by vibration in the existing rolling printing process, thereby improving the product yield.
[0005] The problem of this utility model is solved as follows: an APR plate, the APR plate comprising: an APR plate base layer and an array of photosensitive resin material blocks disposed on the upper surface of the base layer, wherein a plurality of support blocks are uniformly disposed in the gaps between the photosensitive resin material blocks, and the photosensitive resin material blocks and the support blocks have the same thickness.
[0006] Furthermore, the base layer has a double-layer PET structure.
[0007] Furthermore, the width of the support block is greater than 2mm.
[0008] Furthermore, the thickness of both the photosensitive resin material block and the support block is 780 μm.
[0009] Furthermore, the width of the APR plate is 1500mm, and the cumulative width of the support blocks provided in the width direction of the APR plate is greater than 100mm.
[0010] Furthermore, the gaps between the photosensitive resin material blocks are non-circuit layout areas.
[0011] The advantages of this invention are: adding a support design to the APR plate can effectively reduce horizontal unevenness Mura, reduce the related defect rate from 76% to 0%, significantly improve defects, and improve product quality. Attached Figure Description
[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0013] Figure 1 This diagram illustrates the printing effect and corresponding printing process in the existing G6 printing process.
[0014] Figure 2 This is a schematic diagram of the APR version of the old design.
[0015] Figure 3 This is a schematic diagram of the structure of an APR version of this utility model.
[0016] Figure 4 This is a data analysis table for experiments conducted using the APR version of the old design.
[0017] Figure 5 This is a data analysis table for experiments conducted using the newly designed APR version of this utility model. Detailed Implementation
[0018] like Figure 3 As shown, this utility model discloses an APR plate, comprising: an APR plate base layer 1 and photosensitive resin material blocks 2 arranged in an array on the upper surface of the base layer. A plurality of support blocks 3 are uniformly arranged in the gaps between the photosensitive resin material blocks 2. The photosensitive resin material blocks and the support blocks have the same thickness. The support blocks can be made of the same material as the photosensitive resin material blocks, such as unsaturated polybutadiene resin.
[0019] Preferably, the base layer has a double-layer PET (i.e., terephthalic acid and ethylene glycol polycondensate) structure.
[0020] Preferably, the width of the support block is greater than 2mm. Experiments have shown that when the width of the support block is less than 2mm, it is too narrow and lacks stability, making the support prone to deformation and falling under pressure.
[0021] Preferably, the thickness of both the photosensitive resin material block and the support block is 780 μm.
[0022] Preferably, the width H of the APR plate is 1500mm, and the cumulative width of the 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 also 1850×1500. Through experiments, we found that when the cumulative width of the support blocks in the cutout is greater than 100mm, the effect of supporting and mitigating vibration is better.
[0023] Preferably, the gaps between the photosensitive resin material blocks are non-circuit layout areas; specifically, the support blocks are placed at the cross intersections of the blank positions.
[0024] The specific method for producing the APR version of this utility model is as follows:
[0025] Step S1: Based on the position of the photosensitive resin material block array on the circuit design APR board, define it as the first area. In the blank space outside the first area where there is no corresponding circuit arrangement, evenly set a plurality of support blocks, define it as the second area. The second area is the non-circuit arrangement area.
[0026] Step S2: Coat a photosensitive material onto the APR plate substrate, and expose, develop, and fix the first and second regions to obtain the APR plate. The APR plate contains an array of photosensitive resin material blocks and a plurality of support blocks. The photosensitive resin material is unsaturated polybutadiene resin.
[0027] To verify the effectiveness of the APR version structure of this utility model, corresponding experimental tests were conducted, and the experimental results are as follows: Figure 4 and Figure 5 As shown, Figure 4 The result of printing a traditional, standard APR version (i.e., the old design). Figure 5 The printing results for the APR version of this utility model show that the vibration mura defect is represented by the Hor mura code (i.e., unevenness in the horizontal or vertical direction, specifically related to the product arrangement). Figure 4 and Figure 5In the diagram, "S-grade" and "A-grade" represent good products. The sum of these two grades divided by the corresponding total number of LEDs tested gives the yield rate. We found that in the old design, the "Hor mura" defect reached 76%, while after adopting the APR version of this utility model (i.e., the new design), the "Hor mura" defect code is no longer present in the LED defect list; instead, common defects such as foreign objects are present. The number of LEDs tested refers to the number of boards sampled after production to check for defects. The yield rate represents the percentage of good products produced on that board. Each row under the ranking in the table represents a defect code and its percentage. If we only look at the vibration mura performance, we can see that the yield rate of the APR printing using the old design is 0%, and the defect, which is caused by hor mura (the vibration mentioned in the text), reaches 76%. The yield rate of the APR printing using the new design is 73%. The hor mura caused by vibration mentioned in the text is no longer found in the defect codes of the new APR printing. We tracked the cumulative printing of 10,000 pieces of the new design APR printing and found that the yield rate was stable and without any abnormalities, meeting the design requirements, indicating that this defect has been effectively improved.
[0028] In summary, the advantages of this utility model are as follows: by redesigning the APR plate and evenly distributing support blocks in the cutouts of non-circuit areas, the vibration during the rolling printing process can be greatly reduced, thus mitigating the problem of uneven alignment film thickness caused by vibration and improving product quality.
[0029] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.
Claims
1. An APR version, characterized in that: The APR plate includes: an APR plate base layer and an array of photosensitive resin material blocks arranged on the upper surface of the base layer. A plurality of support blocks are uniformly arranged in the gaps between the photosensitive resin material blocks, and the photosensitive resin material blocks and the support blocks have the same thickness.
2. An APR version according to claim 1, characterized in that: The base layer is a double-layer PET structure.
3. An APR version according to claim 1, characterized in that: The width of the support block is greater than 2mm.
4. An APR version according to claim 1, characterized in that: The thickness of both the photosensitive resin material block and the support block is 780 μm.
5. An APR version according to claim 1, characterized in that: The width of the APR plate is 1500mm, and the cumulative width of the support blocks set in the width direction of the APR plate is greater than 100mm.
6. An APR version according to claim 1, characterized in that: The gaps between the photosensitive resin material blocks are non-circuit layout areas.