LCD Bubble Trap Sealant Design for Defect Reduction
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Solution Overview
Problem
Bubbles inevitably form during the liquid crystal injection process in LCD device fabrication, leading to defects on the display screen area where images are displayed.
Innovation Solution
The implementation of a liquid crystal display device with a non-display area outside the display screen, featuring a sealant with a concave bubble trap that guides and intercepts bubbles, preventing them from entering the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid crystal material is injected into the display area during fabrication, then the liquid crystal cells can function, but bubbles are inevitably generated and remain on the display screen area causing defects
Solution Approach 1:
The invention extracts the harmful bubbles from the display area by providing a dedicated escape path that leads to a non-display area. The slope structure and opening work together to remove bubbles from the system before they can contaminate the display region, thereby resolving the contradiction between achieving functional liquid crystal injection and preventing bubble defects.
Solution Approach 2:
The invention converts the harmful effect of bubbles into a beneficial outcome by designing a controlled escape mechanism. Instead of trying to prevent bubble formation entirely, the patent utilizes the natural tendency of bubbles to rise and move toward openings, guiding them into a designated non-display area where they can be safely contained, thus transforming a manufacturing defect into a controlled process feature.
2Area of stationary object
If the entire substrate area is used for display, then the display area is maximized, but bubbles cannot be contained without affecting the display quality
Solution Approach 1:
The invention applies local quality by creating a specific region with different structural properties (the non-display area with slope and opening) that serves a specialized function. This localized feature allows bubbles to be contained and redirected without compromising the overall display area, resolving the contradiction between maximizing display size and ensuring display quality.
3Reliability
If a sealant is used to bond substrates and contain liquid crystal, then liquid crystal retention is improved, but bubbles become trapped within the sealed area causing defects
Solution Approach 1:
The invention segments the sealed area by introducing a slope structure with an opening that creates a distinct bubble escape pathway. This segmentation allows the sealant to retain liquid crystal in the display area while simultaneously providing a separate channel for bubbles to escape to the non-display area, resolving the contradiction between retention and bubble prevention.
Data Source
AI summary
A liquid crystal display device includes a liquid crystal display panel having a liquid crystal area defined within a display area by a sealant, and a non-display area formed in an outer part of the display area, and at least one bubble trap arranged in the outer part of the sealant within the non-display area and patterned to have a concave surface facing toward outside of the non-display area.