Touch Sensing Unit Bent-Line Routing for High-Density Connectivity
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Solution Overview
Problem
Touch signal lines in touch sensing units disconnect 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 a bent portion at their intersection, along with first and second touch electrodes arranged in different columns, and a connection line in a separate layer, to prevent disconnection and enhance 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 patent introduces a third dimension (vertical stacking) by forming touch signal lines in multiple layers. First touch signal lines are formed in a first layer, and second touch signal lines are formed in a second layer above it. This multi-layer approach allows high-density signal routing in the horizontal plane while maintaining reliability through vertical separation and redundancy, preventing disconnection issues that occur in single-layer high-density configurations
Solution Approach 2:
The patent changes the structural parameters of touch signal lines by introducing bent portions at intersection regions. The second touch signal line includes a bent portion that changes its geometric configuration where it intersects with the first touch signal line. This parameter change reduces stress concentration and improves manufacturing yield, preventing disconnection while maintaining high-density routing capability
2Measurement precision
If touch signal lines are formed at high density, then the touch sensing unit can detect finer touch positions, but the manufacturing precision required increases leading to disconnection
Solution Approach 1:
By distributing touch signal lines across multiple vertical layers, the patent reduces the manufacturing precision requirements for each individual line. The multi-layer structure allows for greater spacing between lines in the same layer, making fabrication more reliable while still achieving high-density overall routing capability for precise touch detection
Solution Approach 2:
The patent introduces bent portions in the second touch signal line at intersection regions, replacing straight-line configurations with curved paths. This curvature design reduces stress concentration points and improves manufacturing yield, making the high-density signal routing more reliable and less prone to disconnection during fabrication
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.