LCD Column Spacer Seat Structure for Cell Gap Uniformity
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Solution Overview
Problem
In liquid crystal display (LCD) devices, misalignment during substrate bonding can lead to non-uniform cell gaps, causing image quality defects and reducing the aperture ratio due to the need for wider spacer areas.
Innovation Solution
The implementation of a stable seating surface for column spacers, utilizing a first seat part and a second seat part that overlap the seating surface of the column spacer, minimizing the reduction in aperture ratio while ensuring a uniform cell gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the area of the surface on which the column spacer is seated is widened to prevent cell gap difference, then the uniformity of cell gap is improved, but the aperture area of the pixel is reduced
Solution Approach 1:
The patent divides the seating surface into multiple discrete seat parts (first seat part, second seat part, third seat part) instead of using a single continuous seating area. Each seat part is positioned at specific locations relative to the signal lines, providing stable support for the column spacer while minimizing the total area occupied, thus preventing cell gap difference without significantly reducing aperture ratio.
Solution Approach 2:
The patent applies seat parts with different configurations at different locations: the first seat part overlaps the first signal line, the second seat part overlaps the second signal line, and the third seat part is positioned between them. This localized arrangement provides targeted support where needed while preserving aperture area in other regions, resolving the contradiction between cell gap uniformity and aperture ratio.
2Manufacturing precision
If misalignment is prevented during substrate bonding, then cell gap uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent incorporates seat parts into the substrate structure before bonding occurs. These pre-positioned seat parts provide alignment references that guide the bonding process, ensuring that the column spacer is correctly positioned relative to the signal lines. This preliminary arrangement simplifies the bonding process by providing built-in alignment features, reducing manufacturing complexity while maintaining cell gap uniformity.
Solution Approach 2:
The seat parts act as intermediary elements between the substrate and the column spacer, providing a stable interface that facilitates precise alignment during bonding. By introducing these intermediate structures, the patent simplifies the bonding process while ensuring accurate positioning, thus improving cell gap uniformity without significantly increasing manufacturing complexity.
Data Source
AI summary
A liquid crystal display device includes first and second substrates, a liquid crystal layer, a first signal line including a 1-1st signal line and a 1-2nd signal line extending in a first direction, a second signal line extending in a second direction, a pixel electrode in a pixel region of the first substrate, a first seat part on the first substrate and in a first region between the 1-1st signal line and the 1-2nd signal line and at least partially overlapping the second signal line, a second seat part on the first seat part and overlapping at least a part of the first seat part, and a column spacer disposed on the second substrate and including a seating surface at least partially overlapping the second seat part, where the pixel electrode is disposed outside a region between the 1-1st signal line and the 1-2nd signal line.