COA Substrate DBS Line Routing to Prevent Pixel Through-Hole Short-Circuiting
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Solution Overview
Problem
In large-sized liquid crystal display panels, the data line black matrix (DBS) lines often short-circuit with pixel through-holes due to the accumulation of the color resist layer, preventing a closed pixel through-hole structure and reducing transmittance.
Innovation Solution
A COA substrate design with crisscrossed data and scan lines, where the DBS common electrode line is strategically positioned in a non-opening region to bypass the pixel through-hole, preventing contact with the pixel electrode, using various shapes such as Z-shaped, zigzag, or arc-shaped configurations to avoid short-circuiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the color resist layer is thick to ensure proper color filtration, then the color resist layer accumulates during photoresist irradiation, causing the DBS line to remain in the pixel through-hole and short-circuit with the pixel electrode
Solution Approach 1:
The harmful DBS line segment that causes short-circuiting is extracted and removed from the pixel through-hole region. The DBS line is designed to bypass the pixel through-hole completely, separating the color resist layer processing from the DBS line structure, thus eliminating the short-circuiting problem while maintaining thick color resist for proper color filtration
Solution Approach 2:
A non-opening region is introduced as an intermediary zone between the pixel through-hole and the DBS line. This non-opening region allows the DBS line to pass through without intersecting the pixel electrode, serving as a mediator that prevents direct contact between the DBS line and pixel electrode while still allowing the color resist layer to function properly
2Productivity
If the pixel size is reduced to increase pixel density, then a closed pixel through-hole structure cannot be realized, resulting in a semi-opening shape where the pixel electrode and DBS line coexist in the same hole
Solution Approach 1:
The DBS line is redirected into a different spatial dimension by routing it through the non-opening region alongside the pixel through-hole rather than through the hole itself. This dimensional separation allows small pixel sizes with high density while maintaining closed pixel through-hole structures and preventing DBS line-pixel electrode contact
3Reliability
If the DBS line passes through the pixel through-hole to maintain electrical connection, then the pixel electrode contacts the DBS line causing short-circuiting, but if the DBS line bypasses the pixel through-hole, then the electrical connection path is lengthened
Solution Approach 1:
The pixel unit is segmented into an opening region and a non-opening region, allowing the DBS line to be divided into segments that pass through the non-opening region while maintaining electrical connection. This segmentation prevents short-circuiting in the opening region while keeping the overall path length manageable through efficient routing in the non-opening region
Data Source
AI summary
The present disclosure provides a COA substrate and a liquid crystal display panel, the COA substrate comprises a plurality of crisscrossed data lines and scan lines, and a pixel unit composed of the data lines and the scan lines. The pixel unit is divided into an opening region of the pixel unit and a non-opening region of the pixel unit. The data lines, the scan lines, transistor units, a data line black matrix less (DBS) common electrode line, and a pixel through-hole are electrically connected to the transistor unit, which are disposed in the non-opening region. The DBS common electrode line in the non-opening region of the pixel unit bypasses the pixel through-hole.