LCD Color Filter Substrate Alignment Mark Readability
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Solution Overview
Problem
Conventional LCD manufacturing processes face low success ratios in reading alignment marks due to the lack of optical differences between the alignment marks and their peripheral domains, resulting in inaccurate location, low equipment utilization, and reduced manufacturing efficiency.
Innovation Solution
The transparent conducting layer is patterned to create distinct optical features between the alignment marks and their peripheral domains, allowing for improved visibility and reading by CCD optical lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transparent conducting layer covers both the alignment mark and its peripheral domain completely, then the structural integrity and uniformity are maintained, but the alignment mark cannot be read by CCD optical reading lens due to lack of optical differences
Solution Approach 1:
The transparent conducting layer is patterned to create different coverage characteristics in different regions: the alignment mark region has complete coverage while the peripheral domain has partial or no coverage. This local differentiation creates optical contrast that enables CCD reading while maintaining structural integrity where needed.
Solution Approach 2:
The transparent conducting layer is segmented into distinct regions with different coverage patterns. The alignment mark area is separated from the peripheral domain in terms of layer coverage, creating distinguishable optical features that allow for successful alignment mark detection by CCD lenses.
2Ease of manufacture
If the alignment mark and peripheral domain have the same coverage feature, then the manufacturing process is simple, but the location accuracy and equipment utilization rate decrease
Solution Approach 1:
Different coverage features are assigned to different regions: the alignment mark has complete transparent conducting layer coverage while the peripheral domain has differentiated coverage. This local quality differentiation enables accurate location detection without significantly complicating the overall manufacturing process.
3Difficulty of detecting and measuring
If the transparent conducting layer is patterned to expose the alignment mark, then the alignment mark reading success ratio increases, but the manufacturing complexity increases
Solution Approach 1:
The transparent conducting layer is segmented into covered and exposed regions to create optical contrast. This segmentation enables the alignment mark to be read by CCD lenses while the patterning process remains integrated into existing manufacturing workflows.
Solution Approach 2:
The patterning creates optical contrast similar to color changes - regions with different coverage have different optical properties. This allows the alignment mark to be distinguished from its surroundings optically, enabling successful reading without requiring complex additional structures.
Data Source
AI summary
A liquid crystal display (LCD) panel, a color filter (CF) substrate, and a method of manufacturing the CF substrate are proposed. The method includes forming a black matrix pattern on an invalid pixel domain on a transparent substrate for forming an alignment mark, coating a transparent conducting layer on the invalid pixel domain for covering the alignment mark, and patterning the transparent conducting layer so that the alignment mark and the peripheral domain of the alignment mark could have a different feature of coverage. The alignment mark and the peripheral domain of the alignment mark show optics differences obviously through a CCD (charge-coupled device) optical reading lens, which increases the success ratio of reading the alignment mark and improves manufacturing efficiency.