Display Substrate Lead Routing for Low-Gray Resistance Compensation
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Solution Overview
Problem
The line resistance difference between signal lines in folding screen displays affects the uniformity of low gray scale, necessitating resistance compensation to improve display uniformity.
Innovation Solution
A display substrate design with obliquely arranged data signal leads, varying line widths, and multiple metal layers to reduce line resistance differences, enhancing display uniformity by minimizing the resistance ratio Rmax/Rmin to below 2.0.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If signal lines are arranged in conventional layouts, then device complexity is reduced, but line resistance difference increases causing poor display uniformity
Solution Approach 1:
The patent applies local quality by varying the line widths of different signal lines based on their specific positions and lengths. Signal lines with longer paths or higher resistance are given larger widths to compensate for resistance, while shorter lines maintain smaller widths. This localized adjustment of geometric parameters achieves resistance uniformity across all signal lines without requiring complex additional structures.
Solution Approach 2:
The patent changes the geometric parameters (line width, line length, winding patterns) of signal lines to adjust their resistance values. By modifying these physical parameters, the patent achieves resistance compensation and uniformity. Specifically, signal lines are designed with different widths and winding configurations to ensure that Rmax/Rmin < 2.0, directly addressing the display uniformity issue through parameter optimization.
2Manufacturing precision
If line resistance difference is reduced through compensation, then display uniformity improves, but signal line design complexity increases
Solution Approach 1:
The patent introduces winding patterns and multi-directional routing for signal lines, transitioning from simple straight-line connections to two-dimensional path optimization. Signal lines are designed to wind or fold within the plane, allowing longer effective lengths or adjusted resistance values without increasing the overall device footprint. This dimensional approach enables resistance compensation while maintaining compact device structure.
Solution Approach 2:
The patent employs asymmetric signal line designs where adjacent signal lines have different widths, lengths, or routing patterns. Rather than using uniform symmetric layouts, the patent deliberately creates asymmetric configurations to balance resistance values. For example, signal lines on opposite sides of the display may have different widths to compensate for their different distances from the source driver.
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes: a base substrate, a display area, and a frame area arranged on a first side of the display area; the display area includes a central display area, a first display area and a second display area; the display substrate includes a plurality of first data lines, a plurality of second data lines; the first data signal lead includes a first lead portion extending along a first direction, and the second data signal lead includes a second lead portion extending along a second direction; a line width of the first lead portion is smaller than a line width of the second lead portion; the extension direction of the first data line and the extension direction of the second data line are a third direction.