Liquid Crystal Display Step Compensated Pattern
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Solution Overview
Problem
Liquid crystal displays face issues with uneven substrate surface due to the lower height of the insulating layer in white pixels, leading to a larger cell gap compared to other pixels, which affects the uniformity and aperture ratio.
Innovation Solution
A step compensated pattern is introduced on the white pixel to overlap the domain dividing unit, increasing the flatness and maintaining a uniform cell gap, while also preventing a reduction in the aperture ratio by being separated from neighboring patterns by 40 to 50 μm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the insulating layer height in white pixels is reduced, then the aperture ratio is improved, but the cell gap uniformity deteriorates
Solution Approach 1:
A step compensated pattern is formed in advance in the white pixel region before the color filter formation process. This preliminary structure compensates for the height difference that would otherwise occur, allowing the insulating layer to be thinner while maintaining uniform cell gap across all pixel types.
Solution Approach 2:
The step compensated pattern is applied locally only to white pixels, which have different structural requirements compared to color pixels. This localized modification allows the insulating layer height to be optimized differently for white pixels versus color pixels, improving aperture ratio while maintaining cell gap uniformity.
2Manufacturing precision
If the insulating layer height is increased to maintain cell gap uniformity, then the flatness is improved, but the aperture ratio decreases
Solution Approach 1:
The step compensated pattern is formed beforehand to create a height advantage in white pixels. This allows the insulating layer to be formed thinner overall, increasing aperture ratio while the pre-formed pattern compensates for any height differences to maintain cell gap uniformity.
3Area of stationary object
If the step compensated pattern is positioned closer to neighboring patterns to maximize aperture ratio, then the area is improved, but light leakage increases
Solution Approach 1:
The step compensated pattern acts as an intermediary light-blocking structure positioned between adjacent pixel openings. By placing this pattern at optimized intervals (40-50 μm separation), it provides light blocking functionality while minimizing its impact on the aperture ratio of individual pixels.
Data Source
AI summary
An exemplary embodiment of the present invention provides a liquid crystal display including: a first insulating substrate; a light blocking member positioned on the first insulating substrate and having a frame portion defining openings for pixels; a step compensated pattern positioned on the first insulating substrate and in one of the openings; a second insulating substrate facing the first insulating substrate; a first electrode formed on the first insulating substrate in the same layer as a second domain dividing unit; a second electrode facing the first electrode and disposed in the same layer as the first domain dividing unit; and a liquid crystal layer interposed between the first electrode and the second electrode, wherein the step compensated pattern overlaps the first domain dividing unit or the second domain dividing unit.