Display Substrate Fan-Shaped Wiring Layout to Prevent LCD Yellowing
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Solution Overview
Problem
The issue of yellowing in local areas of LCD panels, particularly at the data pad side, is caused by uneven polyimide (PI) droplet diffusion and aggregation in the fan-shaped metal wiring area, leading to non-uniform cell gaps and display quality degradation.
Innovation Solution
The display substrate design includes a fan-shaped area with interconnected first and second wiring lines forming grid units, where the spacings between these lines are minimized to match the droplet diameter, ensuring uniform droplet distribution and alignment, thereby preventing PI aggregation and yellowing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the spacing between wiring lines in the fan-shaped area is large, then the manufacturing process is easier, but polyimide droplet aggregation occurs leading to yellowing
Solution Approach 1:
The patent changes the spacing parameter of wiring lines in the fan-shaped area to a specific range (50-150 μm) that prevents polyimide droplet aggregation while maintaining manufacturability. This parameter optimization resolves the contradiction by finding the optimal spacing value that avoids yellowing without excessive manufacturing complexity
Solution Approach 2:
The patent applies different wiring line spacing strategies to different regions: the fan-shaped area uses increased spacing (50-150 μm) to prevent aggregation, while other areas may use different spacing. This localized quality adjustment addresses the yellowing problem specifically where it occurs without affecting the entire display panel
2Object-affected harmful factors
If the spacing between wiring lines is reduced to prevent PI aggregation, then yellowing is prevented, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a wiring line spacing range of 50-150 μm in the fan-shaped area, which is larger than conventional spacing. This parameter change reduces the precision requirements for manufacturing while effectively preventing polyimide droplet aggregation and yellowing
Solution Approach 2:
The patent applies excessive spacing (larger than minimum required spacing) in the fan-shaped area to ensure complete prevention of aggregation. This excessive action provides a safety margin that reduces precision requirements during manufacturing
Data Source
AI summary
A display substrate includes a display area and a non-display area surrounding the display area. The non-display area includes a fan-shaped area between the display area and a side edge of the display substrate. The fan-shaped area includes: multiple first wiring lines extending along a direction parallel to an extending direction of the side edge, and multiple second wiring lines extending along a direction perpendicular to the extending direction. The multiple first wiring lines and the multiple second wiring lines are interconnected to form multiple grid units. In each grid unit, a first distance between two first wiring lines and a second distance between two second wiring lines are both less than a preset value.