Intersecting Slender Spacers for LCD Light Leakage Prevention
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Solution Overview
Problem
Liquid crystal display devices face issues with spacers causing damage to alignment films and light leakage due to flexure of the panel, particularly in large-sized panels, leading to reduced aperture ratios and display quality.
Innovation Solution
A liquid crystal display device configuration where slender spacers on opposing substrates intersect, ensuring a uniform contact area and load distribution, preventing spacer contact with pixel portions and minimizing alignment film damage and light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single spacer is disposed on one substrate to hold the gap, then the device complexity is reduced, but the spacer may shift during flexure and cause alignment film damage or light leakage
Solution Approach 1:
The single spacer is divided into two separate spacers, one disposed on each substrate. This segmentation prevents the spacer from shifting during flexure since each spacer is independently positioned on its respective substrate, thereby preventing alignment film damage and light leakage while maintaining structural simplicity.
2Reliability
If the light shielding region is increased to prevent spacer influence during flexure, then the alignment film damage and light leakage are prevented, but the aperture ratio is reduced
Solution Approach 1:
By segmenting the spacer into two separate spacers positioned on opposite substrates, the light shielding region does not need to be increased. Each spacer remains contained within its respective substrate, preventing encroachment on the pixel portion and maintaining a high aperture ratio while ensuring alignment film integrity during flexure.
3Ease of manufacture
If a single spacer is used, then the manufacturing process is simpler, but the contact area with pixel portions is larger causing more damage during flexure
Solution Approach 1:
The single spacer is segmented into two separate spacers, one on each substrate. This reduces the contact area with the pixel portion during flexure since each spacer is independently positioned and cannot shift across the entire pixel area, thereby reducing alignment film damage while maintaining manufacturing simplicity through standard spacer formation processes.
Data Source
AI summary
Provided is a liquid crystal display device which sufficiently prevents a spacer from coming in contact with pixel portions of opposed substrates, and fully inhibits a light leakage from occurring. A liquid crystal display device of the present invention includes a first substrate, a second substrate, a liquid crystal layer interposed between both of the substrates, and a spacer holding a gap between the first substrate and the second substrate, the spacer being configured by laminating a first spacer and a second spacer, the first substrate including the first spacer, the second substrate including the second spacer, each of the first spacer and the second spacer being slender in a plan view of a main surface of each of the substrates, the liquid crystal display device being configured by bonding the first substrate and the second substrate, the first spacer and the second spacer intersecting with each other.