Touch Panel Sub-Scan Segmentation for Line Resistance
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Solution Overview
Problem
As touch panels in display devices increase in size, the line resistance of scan signals increases, leading to a reduced signal-to-noise ratio, which affects the touch sensitivity and accuracy.
Innovation Solution
The touch panel design includes odd-numbered and even-numbered touch sensor rows with alternating sensing signal transmission lines, sub-scan signal transmission lines, and a demultiplexing circuit that selectively connects main scan signal transmission lines to either the first or second sub-scan signal transmission lines, reducing line resistance and improving signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of the touch panel is increased to apply to medium-sized display devices, then the coverage area is improved, but the line resistance of scan signal transmission lines increases
Solution Approach 1:
The touch panel is divided into multiple sub-panels, each with its own scan signal transmission lines. This segmentation reduces the length of individual transmission lines within each sub-panel, thereby lowering line resistance while maintaining the overall large coverage area of the touch panel.
2Area of stationary object
If the number of touch sensors and transmission lines is increased to cover larger area, then the coverage is improved, but the signal-to-noise ratio of scan signals is reduced
Solution Approach 1:
By dividing the large touch panel into multiple sub-panels with separate scan signal transmission lines, the signal transmission distance within each sub-panel is reduced. This minimizes signal attenuation and noise accumulation, thereby maintaining a high signal-to-noise ratio across the entire large coverage area.
3Area of stationary object
If the length of scan signal transmission lines is increased to cover more rows, then the coverage is improved, but the line resistance increases
Solution Approach 1:
The touch panel is segmented into multiple sub-panels, each with its own scan signal transmission lines. This reduces the length of individual transmission lines within each sub-panel, thereby lowering line resistance while maintaining the overall large coverage area of the touch panel.
Solution Approach 2:
The patent introduces a sub-panel structure that adds a dimensional organization to the touch panel layout. By arranging sub-panels in a grid pattern with dedicated transmission lines for each, the system achieves long overall coverage while keeping individual line lengths short, effectively resolving the contradiction between coverage and line length.
Data Source
AI summary
A touch panel includes odd-numbered touch sensor rows, even-numbered touch sensor rows, odd-numbered sensing signal transmission lines extending respectively connected to the odd-numbered touch sensor rows, and even-numbered sensing signal transmission lines respectively connected to the even-numbered touch sensor rows. First sub-scan signal transmission lines are connected only to the odd-numbered touch sensor rows, and second sub-scan signal transmission lines are connected only to the even-numbered touch sensor rows. Main scan signal transmission lines are connected to a demultiplexing circuit to selectively connect the main scan signal transmission lines to the first sub-scan signal transmission lines or the second sub-scan signal transmission lines.