Color Filter Substrate Peripheral Spacing for Light Leakage
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Solution Overview
Problem
The existing color filter substrates face issues with light leakage due to significant height differences between the display region and the peripheral region, caused by the uniform spacing and thickness of color filter units and dummy color filter units, which affect the rubbing process and display quality.
Innovation Solution
Widening the spacing between adjacent dummy color filter units or between a color filter unit and a dummy color filter unit, relative to the spacing between adjacent color filter units, to reduce the height difference and flatten the over-coating layer, thereby optimizing the contour and preventing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform spacing between color filter units and dummy color filter units is used, then manufacturing process is simplified and production cost is reduced, but significant height difference occurs between display region and peripheral region causing light leakage
Solution Approach 1:
The patent applies different spacing to different regions: smaller spacing between adjacent color filter units in the display region, and larger spacing between dummy color filter units or between color filter units and dummy color filter units in the peripheral region. This local differentiation allows the over-coating layer to be sufficiently thick in the peripheral region to prevent light leakage, while maintaining manufacturing simplicity through standardized processes.
2Reliability
If larger spacing between dummy color filter units is used, then height difference between regions is reduced and light leakage is prevented, but manufacturing complexity increases
Solution Approach 1:
The patent changes the spacing parameter selectively in different regions. By increasing the spacing between dummy color filter units and between color filter units and dummy color filter units in the peripheral region, the over-coating layer can achieve sufficient thickness to prevent light leakage. This parameter change is implemented through standard photolithography processes, maintaining manufacturing feasibility.
3Ease of manufacture
If uniform thickness of color filter units and dummy color filter units is used, then production cost is reduced, but height difference causes rubbing process defects
Solution Approach 1:
The patent maintains uniform thickness for all color filter units and dummy color filter units to simplify manufacturing and reduce costs. The height difference issue is resolved not by changing thickness parameters, but by adjusting the spacing between units, which allows the over-coating layer to achieve sufficient thickness in the peripheral region for proper rubbing process execution.
Data Source
AI summary
A color filter substrate includes a transparent substrate, a patterned light-shielding layer, a plurality of color filter units, and a plurality of dummy color filter units. The transparent substrate has a display region and a peripheral region surrounding the display region. The patterned light-shielding layer is disposed on the transparent substrate, and the patterned light-shielding layer includes a first light-shielding pattern disposed on the display region and a second light-shielding pattern disposed on the peripheral region. The first light-shielding pattern defines a plurality of sub-pixel regions. The color filter units are disposed on the display region. The dummy color filter units are disposed on the peripheral region. Spacing between two adjacent dummy color filter units or spacing between the color filter unit and the adjacent dummy color filter unit is wider than spacing between two adjacent color filter units.