LCD Color Filter Overlap in Boundary Areas
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Solution Overview
Problem
The challenge in liquid crystal displays (LCDs) is the misalignment of display panels during bending, which leads to image defects and reduced contrast ratio due to light leakage from the boundary areas between pixel regions, especially when a light blocking member overlaps data lines.
Innovation Solution
The solution involves forming two color filters to overlap each other in the boundary areas between green and neighboring pixel areas, with the overlapping portion closer to the green pixel area to prevent light leakage and enhance contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light blocking member overlaps a data line to prevent image defects from panel misalignment, then image quality is improved, but light leakage occurs near the data line deteriorating the contrast ratio
Solution Approach 1:
The patent removes the light blocking member from the boundary area between pixel regions, extracting the harmful light-blocking function from this specific location while maintaining it elsewhere. This eliminates light leakage and improves contrast ratio without compromising overall image quality, as the light blocking member is taken out only from the critical boundary region where it causes more harm than good.
Solution Approach 2:
The patent applies different structural configurations to different regions of the display panel. Specifically, the light blocking member is positioned differently in boundary areas versus pixel areas, with the boundary area configuration optimized to prevent light leakage while the pixel area maintains standard light blocking. This local differentiation resolves the contradiction by addressing the specific needs of each region.
2Manufacturing precision
If the light blocking member is positioned to overlap data lines to prevent texture defects, then manufacturing precision requirements are reduced, but light leakage phenomenon increases reducing contrast ratio
Solution Approach 1:
The patent extracts the light blocking member from the boundary area between pixel regions, removing the source of light leakage that occurs when the member overlaps data lines. This extraction eliminates the harmful effect on contrast ratio while the light blocking member remains in pixel areas to maintain image quality, thereby resolving the contradiction between manufacturing precision and contrast ratio.
3Illumination intensity
If color filters are formed to overlap in boundary areas with the overlapping portion closer to the green pixel area, then light leakage is prevented improving contrast ratio, but device complexity increases
Solution Approach 1:
The patent implements a localized color filter configuration where the overlapping portion of color filters is positioned closer to the green pixel area specifically in boundary regions. This local modification prevents light leakage and improves contrast ratio without requiring a complete redesign of the entire color filter structure, thereby limiting the increase in device complexity to only the necessary boundary area adjustments.
Data Source
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AI summary
A liquid crystal display ("LCD") includes a first color pixel area, a second color pixel area, and a first boundary area disposed between the first color pixel area and the second color pixel area is provided, the LCD including a first substrate and a second substrate facing each other, a first color filter disposed in the first color pixel area and the first boundary area on the first substrate, a second color filter disposed in the second color pixel area and the first boundary area on the first substrate, and a liquid crystal layer disposed between the first substrate and the second substrate, wherein a first overlapping portion where the first color filter overlaps the second color filter in the first boundary area is disposed closer to the second color pixel area than to the first color pixel area.