Conductive Sheet Lattice for Capacitive Touch Panel
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Solution Overview
Problem
Conventional capacitive touch panels with ITO electrodes exhibit high resistance and low response speed due to their electrode structure, leading to potential complete disconnection issues and reduced detection accuracy when used in large devices.
Innovation Solution
A conductive sheet with a substrate featuring multiple conductive patterns connected via multiple connection paths and auxiliary patterns, enhancing the visibility and detection sensitivity by reducing the probability of complete disconnection and lowering surface resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If ITO electrodes are used to make the electrode matrix less visible, then visibility is improved, but resistance increases to several hundred ohm/sq leading to low response speed
Solution Approach 1:
The patent combines transparent substrate materials with conductive wire materials to create a composite electrode structure. The conductive wires are arranged in lattice patterns on transparent substrates, forming a composite material that simultaneously achieves low surface resistance and high transparency for improved visibility and response speed
Solution Approach 2:
The patent changes the physical parameters of the electrode by using thin conductive wires with specific diameter ranges (1-10 μm) and arranging them in specific lattice patterns. By adjusting wire diameter, spacing, and pattern geometry, the surface resistance is optimized to balance visibility and response speed requirements
2Area of stationary object
If conventional ITO electrodes are used in large devices, then device size increases, but current transfer rate decreases leading to lower detection accuracy
Solution Approach 1:
The electrode is divided into multiple lattice segments across the large device area, with each segment maintaining optimal wire density and spacing. This segmentation allows the electrode to cover large areas while preserving the current transfer characteristics needed for accurate touch detection, preventing signal degradation over distance
Data Source
AI summary
First conductive patterns, which each contain two or more first large lattices electrically connected by a first connection in series in a first direction, are formed on a first transparent substrate, and second conductive patterns, which each contain two or more second large lattices electrically connected by a second connection in series in a second direction perpendicular to the first direction, are formed on a second transparent substrate. As viewed from above, the first conductive patterns and the second conductive patterns are arranged adjacent to each other, and the first connection and the second connection are arranged facing each other. The first large lattices are electrically connected via three or more connection paths in the first connection, and the second large lattices are electrically connected via three or more connection paths in the second connection.