Display Substrate Trace Layout for Low-Gray Uniformity
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Solution Overview
Problem
Display substrates with special shapes, such as notched or triangular displays, face issues with uneven low gray scale images due to resistance-capacitance (RC) load differences between regions, leading to white deviations in low gray level displays.
Innovation Solution
The display substrate incorporates a base substrate with a first region and a second region, featuring sub-pixels and signal lines, along with overlapping traces in the second region, where the orthographic projection of signal line connection lines is completely within the overlapping traces, maximizing overlap area while ensuring light transmittance, thus compensating the RC load to prevent uneven low gray scale images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display substrate has a special shape with notches or openings to improve screen ratio and appearance, then the screen ratio and appearance are improved, but the RC load varies across different regions causing mura issues
Solution Approach 1:
The patent applies local quality by configuring different trace arrangements in different regions of the display substrate. Specifically, first traces are arranged in a first region while second traces are arranged in a second region with different geometric characteristics. This regional differentiation allows the RC load to be locally optimized for each area, compensating for the non-uniformity introduced by the notch or opening shape, thereby maintaining display uniformity across the entire substrate.
Solution Approach 2:
The patent employs parameter changes by modifying the geometric parameters of the traces (such as width, length, and spacing) in different regions. The first traces and second traces have different configurations tailored to their respective regions' RC load characteristics. By adjusting these physical parameters, the patent compensates for the varying RC loads caused by the special shape, ensuring consistent charging times and preventing mura while preserving the high screen ratio design.
2Reliability
If traces are added to compensate for RC load in regions with notches, then display uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the display substrate into distinct regions (first region and second region) and configuring separate trace arrangements for each. The first traces are confined to the first region while the second traces are confined to the second region. This segmented approach simplifies the overall design by creating modular, region-specific solutions rather than requiring a complex unified trace pattern across the entire substrate, thereby reducing device complexity while maintaining display uniformity.
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes a base substrate, sub-pixels, signal lines and signal line connection lines. The base substrate includes a first region and a second region, and a number of the sub-pixels along a first direction in the first region is larger than a number of the sub-pixels along the first direction in the second region. The signal line connection lines are electrically connected with the signal lines located in the second region. The display substrate further includes overlapping traces disposed at intervals and located in a layer different from that of the signal line connection lines. An orthographic projection of at least one of the signal line connection lines on the base substrate is completely within an orthographic projection of at least one of the overlapping traces on the base substrate.