Multilayer Touch Sensor Lines With Variable Width for Signal Accuracy
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Solution Overview
Problem
In touch sensors, differences in line resistance between sensing lines due to varying lengths distort touch event signals, leading to inaccurate detection.
Innovation Solution
The sensing lines are formed as multilayer structures with varying widths to equalize line resistance, using a first electrically conductive layer connected via contact holes in an insulating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sensing lines have the same line width, then manufacturing is simple, but line resistance differences occur due to different line lengths causing signal distortion
Solution Approach 1:
The patent applies local quality by making each sensing line have a different line width according to its specific length requirements. Longer sensing lines are given greater widths to compensate for their length, while shorter lines have smaller widths. This localized differentiation in geometric parameters ensures that all sensing lines achieve substantially equal resistance values despite having different lengths, thereby eliminating signal distortion without requiring complex manufacturing processes.
2Measurement precision
If sensing lines have different line widths to equalize resistance, then touch recognition accuracy improves, but manufacturing complexity increases
Solution Approach 1:
The patent implements parameter changes by systematically varying the line width parameter of sensing lines based on their length characteristics. Each sensing line's width is adjusted as a function of its length to achieve uniform resistance across all lines. This parameter optimization approach equalizes the electrical properties of sensing lines with different geometries, improving touch recognition accuracy while maintaining a relatively simple manufacturing process that only requires precise control of line width during fabrication.
Data Source
AI summary
A touch sensor includes a substrate, an insulating layer, a sensor, and sensing lines. The substrate includes: a sensing region, and a peripheral region at a periphery of the sensing region. The insulating layer is on the substrate. The insulating layer includes contact holes. The sensor is on the substrate and overlaps the sensing region. The sensing lines are on the substrate and overlap the peripheral region. The sensing lines are connected to the sensor. Each of the sensing lines is formed as a multilayer structure. The multilayer structure includes a first electrically conductive layer on the substrate, and a second electrically conductive layer connected to the first electrically conductive layer via a contact hole among the contact holes. Widths of the sensing lines are different from one another.