Liquid Crystal Display Corner Pixel Sealant Separation
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Solution Overview
Problem
In narrow bezel liquid crystal displays, the difficulty in perpendicularly forming sealants at corners leads to overlapping with pixels, causing pixel failures due to the limitations of sealant coating devices.
Innovation Solution
The design includes corner pixels with differently sized pixel electrodes that do not overlap with the sealant, and the use of corner and edge sealants that are separated from the pixel electrodes, with dams on both substrates to prevent sealant spread into the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealant is coated in narrow bezel corners, then sealing function is achieved, but pixel overlap occurs causing pixel failure
Solution Approach 1:
The pixel array is segmented into normal pixels and corner pixels, where corner pixels have different electrode configurations to avoid overlap with sealant. The sealant path is also segmented into edge sealant regions and corner sealant regions with different formation approaches.
Solution Approach 2:
Corner pixels are given different local characteristics compared to normal pixels, specifically in the pixel electrode size and shape near the corner region, allowing the sealant to be formed without overlapping active pixel areas while maintaining proper sealing function.
2Reliability
If corner pixel electrode size is reduced, then sealant overlap is avoided, but pixel display area is reduced
Solution Approach 1:
The pixel electrode is segmented into different regions, with the corner portion having reduced area to avoid sealant overlap while the main pixel area maintains full size for proper display function.
Solution Approach 2:
The pixel electrode exhibits local quality variation where the corner region has different dimensions compared to the central region, optimizing both sealant compatibility and display area utilization.
3Reliability
If sealant is formed with curved lines in corners, then pixel overlap is avoided, but sealing uniformity deteriorates
Solution Approach 1:
The sealant structure is segmented into edge sealant portions that can be perpendicularly formed and corner sealant portions that are rounded, with each segment optimized for its specific formation method and functional requirements.
Solution Approach 2:
The corner sealant is formed with a rounded shape instead of a perpendicular angle, allowing the sealant to smoothly navigate the corner region without overlapping pixels while maintaining structural integrity and uniformity.
4Ease of manufacture
If perpendicularly formed sealant coating device is used, then manufacturing complexity is reduced, but corner sealant formation becomes difficult
Solution Approach 1:
The corner sealant is designed with a rounded profile that can be formed by a perpendicularly moving coating device, eliminating the need for complex corner-handling mechanisms while achieving proper sealant formation in corner regions.
Solution Approach 2:
The pixel electrode patterns are preliminarily designed to accommodate the sealant path, creating sufficient clearance in corner regions before sealant formation, which enables simple perpendicular coating without subsequent adjustments.
Data Source
AI summary
A liquid crystal display according to an exemplary embodiment includes a display substrate including a display area for displaying an image and a non-display area enclosing the display area; a plurality of normal pixels formed in an edge region among a center region of the display area and a peripheral area of the display area, and a plurality of corner pixels formed in a corner region of the peripheral area of the display area; and a sealant formed in the non-display area. A corner pixel of the plurality of corner pixels and the sealant are separated from each other.