Touch Sensor Control Line Layout for Low-Noise Display Detection
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Solution Overview
Problem
Existing touch detection devices face challenges in reducing noise and degradation of touch detection performance due to overlapping control lines, which can lead to coupling capacitance and interference.
Innovation Solution
The design includes first and second control lines that overlap at specific angles and widths, with the first control lines being thinner and arranged to minimize parallel overlap, using a staggered or inclined layout to equalize overlapping areas and reduce coupling capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control lines are arranged to connect detection electrodes, then electrical connection is achieved, but coupling capacitance and noise increase due to overlapping lines
Solution Approach 1:
The first control lines are designed with a smaller line width than the second control lines. This asymmetric width design reduces the overlapping area between the two sets of control lines, thereby minimizing coupling capacitance while maintaining functional connectivity of the detection electrodes.
Solution Approach 2:
The control lines are arranged in a three-dimensional layered structure where first control lines and second control lines are positioned at different vertical levels. This spatial separation in the vertical dimension reduces parasitic capacitance coupling between the lines while maintaining their respective electrical connections.
2Device complexity
If control lines overlap to route signals, then routing efficiency is improved, but touch detection accuracy degrades due to interference
Solution Approach 1:
By making the first control lines narrower than the second control lines, the overlapping region between the two sets of lines is reduced. This asymmetric design minimizes the parasitic capacitance formed in overlapping regions, thereby reducing noise and interference that would otherwise degrade touch detection accuracy.
Solution Approach 2:
The line width of control lines is optimized locally based on their function and position. First control lines have a smaller width optimized for their specific routing requirements, while second control lines have a different width optimized for their functions. This local optimization reduces unnecessary overlap and improves measurement precision.
Data Source
AI summary
According to one embodiment, a touch detection device includes first detection electrodes in a detection area, second detection electrodes in the detection area, extending to intersect the first detection electrodes, first control lines connected to the first detection electrodes, respectively, and provided in a non-detection area, and second control lines connected to the second detection electrodes, respectively, and provided in the non-detection area. The second control lines overlap the first control lines at a plurality of positions as seen in plan view, such that areas of overlapping portions in which the first control lines overlap the second control lines are substantially equalized.