Touch Panel Substrate with Wide Conductor Ends
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Solution Overview
Problem
Touch panel devices with electrodes on the same substrate exhibit non-uniform light transmittance due to spaces between conductor lines, leading to visual recognition of patterns and deterioration in display quality.
Innovation Solution
A touch panel substrate with conductor lines arranged in a net-like pattern and divided into electrodes, featuring wide width parts at the ends of the conductor lines to reduce light transmittance variations, ensuring uniformity across the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductor lines are provided as each electrode at regular intervals, then electrodes are electrically insulated from each other, but light transmittance becomes non-uniform causing visual pattern recognition
Solution Approach 1:
The conductor lines are designed with varying width along their length, with wider portions at specific locations and narrower portions at others. This local variation in geometric properties allows the same conductor line structure to simultaneously provide electrical insulation between electrodes while controlling light transmittance to achieve uniform appearance across the touch panel surface.
Solution Approach 2:
The width parameter of the conductor lines is changed along the length of the conductor lines, creating a gradient or varied width profile. This parameter change allows the conductor lines to modulate light transmission locally, compensating for the periodic pattern effect and achieving uniform overall light transmittance while maintaining electrical insulation functionality.
2Reliability
If spaces are left between adjacent electrodes for insulation, then electrical isolation is achieved, but light transmittance difference arises between electrode regions and space regions
Solution Approach 1:
Instead of uniform width throughout, the conductor lines incorporate wider and narrower portions at different locations. The wider portions are positioned to compensate for the high light transmittance spaces between electrodes, while narrower portions are positioned at electrode regions, thereby equalizing the overall light transmittance across the entire structure while preserving electrical isolation.
Solution Approach 2:
The spaces between electrodes, which initially cause non-uniform light transmittance, are compensated for by strategically designing wider portions of conductor lines adjacent to these spaces. The harmful effect of varying light transmittance is converted into a design opportunity where the conductor line width variation serves to balance the optical properties across the entire electrode structure.
Data Source
AI summary
Provided are (i) a touch panel substrate improved in uniformity of in-plane light transmittance and (ii) an electronic device employing the touch panel substrate. A plurality of first sensor electrodes (11) are formed by dividing first conductor lines (13). At least one of a pair of ends of the first conductor lines (13), which pair of ends face each other via a dividing line along which the first conductor lines (13) are divided, has a wide width part (40) which is wider than the other part of the first conductor lines (13), when viewed from above.