Asymmetric Bridge Pattern Touch Sensor for Signal Delay Reduction
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Solution Overview
Problem
Touch sensors suffer from image quality degradation due to unnecessary recognition of bridge patterns, unstable connection between sensing electrode patterns, increased channel resistance, and signal delay, as well as disconnection under high voltage environments, which impede their operating speed and electrical characteristics.
Innovation Solution
A touch sensor design featuring asymmetric bridge pattern portions with narrower connecting portions and multiple contact areas, formed in a winding curve shape using materials like silver or silver alloys, to stabilize connections and prevent recognition issues, thereby reducing channel resistance and signal delay while maintaining electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bridge patterns are provided to electrically connect adjacent sensing electrode patterns, then electrical connection is achieved, but the bridge patterns are unnecessarily recognized by the user causing image quality degradation
Solution Approach 1:
The bridge pattern is designed with different width characteristics in different regions: a first width in the region corresponding to the touch-sensitive area and a second width in other regions. This local variation allows the bridge to maintain electrical connection functionality while minimizing visual impact in the touch-sensitive area where users are most likely to notice it.
Solution Approach 2:
The bridge pattern employs asymmetric width design where the width varies along its length rather than being uniform. Specifically, the width is narrower in the touch-sensitive area region and wider in non-sensitive regions, creating an asymmetric structure that optimizes both electrical performance and visual invisibility.
2Ease of manufacture
If the connection between sensing electrode pattern and bridge patterns is unstable, then manufacturing is simplified, but channel resistance and signal delay time increase reducing operating speed
Solution Approach 1:
The bridge pattern width is optimized to specific ranges: 1-5 μm in the touch-sensitive area and 5-10 μm in other regions. These parameter specifications ensure stable electrical connection while controlling channel resistance and signal delay time, thereby maintaining high operating speed despite the simplified manufacturing process.
3Reliability
If bridge patterns are used in conventional design, then electrical connection is provided, but disconnection occurs under high voltage environment
Solution Approach 1:
The bridge pattern is designed with enhanced width in regions subjected to high voltage stress to prevent disconnection. By making the bridge wider in non-touch areas where voltage stress is concentrated, the design maintains stable electrical connection under high voltage conditions while keeping the touch-sensitive area narrow for visual invisibility.
Data Source
AI summary
The present invention relates to a touch sensor comprising: a plurality of first sensing electrode patterns formed in a way that they are connected to each other along a first direction on a substrate; a plurality of second sensing electrode patterns formed in a way that they are separated from each other along a second direction on the substrate; insulating portions electrically insulating the first sensing electrode patterns and the second sensing electrode patterns; and bridge pattern portions electrically connecting the adjacent second sensing electrode patterns, wherein the bridge pattern portions comprise: contact portions which are respectively contacted to the adjacent second sensing electrode patterns, and connecting portions connecting the contact portions and having a narrower width than the contact portions.