Display Substrate Color Filter Overlap for Liquid Crystal Uniformity
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Solution Overview
Problem
In liquid crystal display (LCD) fabrication, non-uniform spread of liquid crystal material between substrates can lead to display defects, reducing the quality of the display device.
Innovation Solution
A display device array substrate design featuring first and second substrates with a display area and a dummy area around the periphery, where color filters on the first substrate include overlapping and non-overlapping configurations to ensure uniform liquid crystal application, with a dummy color filter extending around the display area and a black matrix to prevent light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid crystal material is applied between substrates, then the display device can function, but non-uniform spread occurs causing display defects
Solution Approach 1:
The color filters are configured to overlap in the display area before liquid crystal application, creating a preliminary structural arrangement that guides uniform liquid crystal spread. This pre-arranged overlapping structure prevents non-uniform spread by ensuring consistent spacing and alignment across the display area.
Solution Approach 2:
The color filters have different configurations in different areas: overlapping in the display area for uniform liquid crystal application, and non-overlapping in the dummy area to prevent defects. This local differentiation of filter arrangement optimizes performance for each specific region's requirements.
2Manufacturing precision
If color filters are arranged to overlap in the display area, then liquid crystal application becomes uniform, but device complexity increases
Solution Approach 1:
The color filter structure serves multiple functions: it provides color filtering, creates overlapping regions for uniform liquid crystal application, defines display and dummy areas, and prevents defect formation. By making the filter configuration multi-functional, the patent reduces overall device complexity while achieving uniform liquid crystal application.
3Manufacturing precision
If dummy color filter is added around the display area, then liquid crystal spread is improved, but manufacturing complexity increases
Solution Approach 1:
The dummy color filter is formed using the same material and formation process as the regular color filters, merging the dummy area fabrication with the display area fabrication. This integration allows uniform manufacturing processes while achieving improved liquid crystal spread through the extended filter structure.
Data Source
AI summary
A display device array substrate comprising first and second substrates that comprise a display area and a dummy area around the periphery of the display area, and that face each other; a color filter disposed on the first substrate; and a liquid crystal layer disposed on the color filter. The color filter comprises at least one or more first color filters and adjacent second color filters, and the first color filters and the second color filters overlap each other in the display area and do not overlap each other in the dummy area.