Touch Sensor Line Widths for Uniform Recognition Signals
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Solution Overview
Problem
In touch sensors, varying line lengths of sensing lines lead to differences in line resistance, which distort touch event signals and hinder accurate detection.
Innovation Solution
The sensing lines are formed as multilayer structures with varying widths to maintain uniform touch recognition rates, 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 simplified, but line resistance differences occur due to different line lengths
Solution Approach 1:
The patent applies local quality by making each sensing line have a different width according to its specific length requirements. Longer sensing lines are made wider to compensate for their increased resistance, while shorter lines are made narrower. This localized adjustment of the width parameter for each sensing line ensures uniform resistance characteristics across all lines, resolving the contradiction between manufacturing simplicity and touch recognition uniformity.
2Reliability
If sensing lines have different line widths, then line resistance uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs parameter changes by systematically varying the width parameter of sensing lines based on their length. Each sensing line's width is adjusted as a function of its length to achieve uniform resistance. This parameter adjustment approach allows for uniform touch recognition performance while maintaining a relatively simple manufacturing process through automated patterning techniques.
3Measurement precision
If line resistance differences increase, then signal distortion occurs, but adjusting line widths increases design complexity
Solution Approach 1:
The patent applies local quality by tailoring the width of each sensing line to its specific position and length requirements. This localized optimization ensures that each line has the appropriate resistance characteristics for accurate signal transmission, minimizing signal distortion while maintaining manageable design complexity through systematic width assignment.
Solution Approach 2:
The patent uses parameter changes by adjusting the width parameter of sensing lines to compensate for length variations. This systematic parameter adjustment optimizes the resistance characteristics of each line, reducing signal distortion and improving touch detection accuracy without requiring overly complex design methodologies.
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.