Display Panel Shielding Layer for Signal-Corner Light Leakage
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Solution Overview
Problem
Current LCD panels suffer from light leakage and low luminance contrast due to insufficient shielding at the sharp corners of data lines, particularly in high PPI and dual-gate designs, leading to poor display effects.
Innovation Solution
The display panel design includes a shielding layer that covers the signal lines with corner portions designed to overlap the signal line corners, where the area of the shielding layer's corner projection exceeds that of the signal line's, ensuring comprehensive coverage and reducing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the shielding layer is designed to cover signal lines with standard corner portions, then the manufacturing process is simple, but light leakage occurs at sharp corners of data lines
Solution Approach 1:
The shielding layer is designed with different corner portion configurations at different locations. Specifically, at least one corner portion of the shielding layer has a larger area than the corresponding corner portion of the data line, creating localized enhanced shielding exactly where light leakage occurs at sharp corners, while other areas maintain standard shielding coverage.
Solution Approach 2:
The shielding layer is divided into multiple functional regions: main body portions that cover the signal lines, corner portions that specifically address sharp corner areas, and optionally auxiliary shielding portions that provide additional coverage. This segmentation allows each region to be optimized for its specific function, with corner portions having larger areas to block light leakage at critical locations.
2Object-affected harmful factors
If the shielding layer corner portions are enlarged to cover signal line corners, then light leakage is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The shielding layer corner portions are designed with asymmetric dimensions relative to the data line corner portions. The shielding layer corner portions have larger areas, with at least one side extending beyond the corresponding data line corner portion. This asymmetric design ensures comprehensive coverage of sharp corner areas while providing clear fabrication guidelines that simplify rather than complicate the manufacturing process.
3Illumination intensity
If standard shielding coverage is used, then the device structure remains simple, but luminance contrast is poor
Solution Approach 1:
The shielding layer implements localized quality enhancement at corner portions, where the area is deliberately increased to provide superior light blocking at sharp corners. This local enhancement improves luminance contrast specifically at these critical areas without requiring comprehensive complexity throughout the entire shielding layer structure.
Solution Approach 2:
Rather than uniformly increasing the shielding layer area throughout, the design applies partial or excessive shielding action only at corner portions where light leakage occurs. The shielding layer corner portions extend beyond the minimum required coverage, providing excessive shielding at critical locations while maintaining standard coverage elsewhere, thus improving luminance contrast without unnecessary complexity.
Data Source
AI summary
Provided is a display panel. The display panel includes: a first substrate and a second substrate disposed opposite to each other, and a liquid crystal layer disposed between the first substrate and the second substrate; wherein the first substrate comprises a first base substrate, a plurality of first signal lines and a plurality of second signal lines disposed on a side, close to the second substrate, of the first substrate; and the second substrate comprises a second base substrate, and a shielding layer disposed on a side, close to the first substrate, of the second base substrate.