Color Filter Overlap for Liquid Crystal on Silicon Display Light Leakage
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Solution Overview
Problem
High sub-pixel density in liquid crystal on silicon display devices leads to fringe field effects, causing light leakage between adjacent sub-pixels, which results in unexpected color light leakage and detrimental display performance.
Innovation Solution
The color filter layer is configured such that each color area is partially overlapped with two adjacent sub-pixel electrodes, with the shape of the color areas conforming to the fringe field distribution range of the corresponding sub-pixel electrodes, allowing the area of sub-pixel electrodes to be maximized without reducing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the density of sub-pixels is increased to improve display resolution, then the display resolution is improved, but light leakage between adjacent sub-pixels occurs due to fringe field effects
Solution Approach 1:
The color filter layer is designed with different overlap configurations in different regions. Specifically, color filter regions are configured to overlap with adjacent sub-pixel electrodes in areas where fringe field effects are present, while maintaining precise alignment in central regions. This local differentiation allows the filter to block light leakage caused by fringe fields without compromising the overall display resolution
Solution Approach 2:
The color filter layer serves as an intermediary element between the sub-pixel electrodes and the liquid crystal layer. By strategically positioning color filter regions to overlap with adjacent sub-pixel electrodes, the filter acts as a mediator that blocks the fringe field-induced light leakage while allowing the primary light modulation function to remain effective
2Object-generated harmful factors
If the area of sub-pixel electrodes is reduced to minimize fringe field effects, then light leakage is reduced, but the aperture ratio decreases
Solution Approach 1:
The color filter layer is segmented into multiple functional regions: regions that align with sub-pixel electrodes for primary light modulation, and regions that overlap with adjacent sub-pixel electrodes for light leakage prevention. This segmentation allows the system to simultaneously achieve high aperture ratio through large electrode areas and effective light leakage control through strategically positioned filter segments
Solution Approach 2:
The solution moves from a one-dimensional approach (reducing electrode area) to a two-dimensional approach (strategically positioning color filter regions). By utilizing the spatial dimension of the color filter layer, the invention achieves light leakage control without compromising electrode area or aperture ratio
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively prevents color light leakage, improving display performance and color saturation while maintaining a high aperture ratio.
Implementation Method 1
The color filter layer is configured on the substrate. The color filter layer defines a plurality of color areas corresponding to the sub-pixel electrodes. Each of the color areas is partially overlapped with two of the sub-pixel electrodes adjacent to each other... effectively prevents color light leakage
Data Source
AI summary
A display device and a method for manufacturing the display device are provided. The display device includes a substrate and a color filter layer. A plurality of sub-pixel electrodes are formed on the substrate. The color filter layer is configured on the substrate. The color filter layer defines a plurality of color areas corresponding to the sub-pixel electrodes. Here, each of the color areas is partially overlapped with two of the sub-pixel electrodes adjacent to each other.