Variable-Pattern Micro-Wire Electrodes for Touch Screens
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Solution Overview
Problem
Current transparent conductors in capacitive touch screens face limitations in conductivity and transparency, with existing materials like indium tin oxide being inadequate for high-performance applications, and previous methods to enhance conductivity often compromise transparency or durability.
Innovation Solution
The development of a touch-responsive capacitive apparatus featuring a transparent substrate with electrically connected pad and interstitial micro-wires in distinct micro-patterns, which form touch-responsive capacitors, improving conductivity and transparency without affecting the overall transparency of the touch screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thicker layers of metal oxides or metals are used to increase conductivity, then conductivity is improved, but transparency is reduced
Solution Approach 1:
The electrode is divided into multiple separate metal wire segments arranged in a grid pattern, with each wire being thin and transparent. This segmentation allows the electrode to achieve sufficient conductivity through the network of wires while maintaining transparency because individual thin wires do not block light significantly.
Solution Approach 2:
Different regions of the electrode have different wire densities and configurations. The grid pattern provides higher conductivity in areas requiring it while using sparser wire arrangements in other areas to maintain transparency, optimizing the local balance between conductivity and transparency requirements.
2Reliability
If more metal wires are added to increase conductivity, then conductivity is improved, but transparency is reduced
Solution Approach 1:
The electrode consists of numerous thin metal wire segments arranged in a grid pattern rather than a single thick wire. This segmentation enables the system to achieve adequate conductivity through the collective effect of many thin wires while maintaining transparency because each individual wire is thin enough to be substantially transparent.
3Reliability
If auxiliary electrodes are added to improve conductivity, then conductivity is improved, but device complexity is increased
Solution Approach 1:
The conductive function is merged into the transparent substrate itself by embedding metal wires within or on the substrate. This integration eliminates the need for separate auxiliary electrodes and reduces overall device complexity while achieving the desired conductivity enhancement.
Data Source
AI summary
A touch-responsive capacitive apparatus includes a transparent substrate having electrically connected first pad micro-wires and electrically connected first interstitial micro-wires formed in a first micro-wire layer. The first pad micro-wires are electrically connected to the first interstitial wires. Electrically connected second pad micro-wires and electrically connected second interstitial micro-wires are formed in a second micro-wire layer. The second pad micro-wires are electrically connected to the second interstitial wires. The first or second micro-wire layers are supported by the transparent substrate and pairs of first and second pad areas define corresponding touch-responsive capacitors. A first interstitial micro-pattern is dissimilar from a first pad micro-pattern or a second interstitial micro-pattern is dissimilar from a second pad micro-pattern.