Touch Window Electrode Mesh Design for Visibility
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Solution Overview
Problem
Conventional touch windows face challenges in improving visibility and efficiency due to the visibility of wire electrodes extending from active to non-active areas and differences in light intensity between sensing and wire electrode areas, which affect the reliability and performance of the touch interface.
Innovation Solution
A touch window design featuring a substrate with distinct areas for sensing and wire electrodes, where the wire electrode has a larger mesh size and area ratio compared to the sensing electrode, reducing sheet and line resistance and preventing visibility issues by adjusting light transmittance and mesh line sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire electrodes are provided on the active area including metal, then electrical connectivity is ensured, but the wire electrode becomes visible from outside degrading visibility
Solution Approach 1:
The patent applies different closing ratios to different areas: the sensing electrode area uses a first closing ratio optimized for touch detection, while the wire electrode area uses a second closing ratio that reduces visibility. This local differentiation allows the wire electrode region to have lower visual impact while maintaining electrical connectivity, and the sensing region to maintain optimal sensing performance.
2Illumination intensity
If the wire electrode mesh size is increased to reduce visibility, then visibility improves, but sheet resistance and line resistance increase reducing efficiency
Solution Approach 1:
The patent changes the closing ratio parameter specifically for the wire electrode area to be different from the sensing electrode area. By adjusting this parameter, the patent achieves a balance where the wire electrode area has reduced visibility (improved illumination characteristics) while maintaining sufficient electrical conductivity through optimized mesh configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the visibility and reliability of the touch window by reducing the visibility of wire electrodes and improving efficiency through controlled light transmittance and resistance reduction, ensuring better performance and user experience.
Implementation Method 1
the position of the touch point is detected by detecting the variation in capacitance when a finger of the user is touched on the capacitive touch window between electrodes
Implementation Method 2
the wire electrode has a larger mesh size and area ratio compared to the sensing electrode, reducing sheet and line resistance
Data Source
AI summary
Disclosed is a touch window including a substrate, and a sensing electrode provided on the substrate and a wire electrode connected with the sensing electrode. The substrate includes a first area having the sensing electrode and a second area having the wire electrode. The first area has the sensing electrode by a first closing ratio, the second area has the wire electrode by a second closing ratio, and a size of the first closing ratio is equal to or different from a size of the second closing ratio.