Bent Touch Signal Line Layout for Dense Display Sensors
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Solution Overview
Problem
Touch signal lines in touch sensing units are prone to disconnection when formed at high density, disrupting the functionality of touch sensing units in display devices.
Innovation Solution
The implementation of first and second touch signal lines with bent portions and overlapping connections in the intersection regions, along with varying widths and lengths, reduces the likelihood of disconnection, and the use of guard lines and ground voltage application enhances signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch signal lines are formed at high density to improve touch sensing resolution, then measurement precision is improved, but the reliability of the signal lines deteriorates due to disconnection
Solution Approach 1:
The signal lines are designed with bent portions instead of straight configurations. The bent portions increase the path length and surface area of the signal lines without occupying additional horizontal space, thereby maintaining high density while improving connection reliability through enhanced mechanical strength and stress distribution
Solution Approach 2:
The signal lines utilize vertical stacking (different layers) to resolve intersections and overlapping regions. By moving connections to different vertical planes, the design maintains high horizontal density while ensuring reliable electrical connections without physical interference between lines
2Measurement precision
If touch signal lines are formed at high density to improve touch sensing resolution, then measurement precision is improved, but manufacturing precision deteriorates due to difficulty in maintaining continuous connections
Solution Approach 1:
The bent portions of the signal lines are designed with specific curvature radii that are optimized for manufacturing. The curved configurations distribute stress more evenly during fabrication processes, reducing the likelihood of breakage and improving manufacturing yield while maintaining the ability to form high-density patterns
Solution Approach 2:
The signal line design incorporates redundant path length and structural flexibility in bent portions to compensate for manufacturing variations. This cushioning effect allows the signal lines to absorb stress and deformation during manufacturing without losing electrical continuity
Data Source
AI summary
A touch sensing unit includes first touch electrodes, a first touch signal line, and a second touch signal line. The first touch electrodes are disposed in a touch sensor area. The first touch signal line is electrically connected to some of the first touch electrodes arranged in a first column. The second touch signal line is electrically connected to some of the first touch electrodes arranged in a second column different from the first column. The second touch signal line includes a first bent portion bent at least once in an intersection region of the first touch signal line and the second touch signal line.