Color Filter Structure with Curved Surface for Viewing Angle Color Shift
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Solution Overview
Problem
Conventional color filters exhibit color shift phenomenon due to varying film thickness at different viewing angles, affecting color conversion ability and brightness.
Innovation Solution
A novel color filter structure with a plurality of color filter units in circular or polygonal arc shapes, fabricated using methods like inkjet printing or blade coating, ensuring uniform film thickness ranging from 0.1 um to 10 um in a radial direction, and featuring black matrices between units, is developed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional color filter with uniform vertical thickness is used, then the manufacturing process is simple, but the film thickness varies at different viewing angles causing color shift
Solution Approach 1:
The color filter is designed with a convex curved surface (circular arc or polygonal arc shape) instead of a flat surface. This curvature ensures that the film thickness remains substantially uniform when viewed from different angles, eliminating the color shift phenomenon while maintaining manufacturability through standard coating processes.
2Reliability
If the color filter film thickness is increased to improve color conversion, then color conversion ability improves, but transmission spectrum varies significantly causing color shift
Solution Approach 1:
By forming the color filter with a convex curved surface, the optical path length through the filter remains consistent across different viewing angles. This allows the filter to maintain uniform color conversion ability and transmission spectrum characteristics regardless of viewing angle, eliminating color shift while preserving color accuracy.
3Device complexity
If a flat color filter structure is used, then the device complexity is low, but color shift occurs at different viewing angles
Solution Approach 1:
The invention introduces a convex curved surface geometry to the color filter, which is a relatively simple structural modification that effectively eliminates color shift at different viewing angles. This curved structure maintains uniform optical properties across the viewing cone without requiring complex multi-layer designs or additional components.
Data Source
AI summary
The invention provides a color filter structure and a method of fabricating the same, the color filter structure including: a plurality of color filter units, wherein each of the plurality of color filter units has a longitudinal section of a circular arc shape or a polygonal arc shape.