Circular Touch Panel Electrode Design for Signal Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In touch panels with circular touch regions, the size and capacitance differences between central and peripheral touch electrodes lead to poor uniformity in touch signals, as central electrodes are typically square while peripheral ones are larger and differently sized.
Innovation Solution
A touch panel design with a circular touch region featuring triangular central electrodes and fan-shaped distribution of electrodes around a central point, reducing size and capacitance differences, and using non-linear side edges and uniform electrode areas to enhance signal uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If square touch electrodes are used in the center of a circular touch region, then the manufacturing process is simple, but the size and capacitance differences between central and peripheral electrodes lead to poor uniformity in touch signals
Solution Approach 1:
The patent applies local quality by making touch electrodes at different positions have different shapes: central electrodes are square while peripheral electrodes are trapezoidal. This local differentiation allows each electrode to be optimized for its specific position, achieving uniform capacitance and touch signal uniformity across the entire circular touch region while maintaining manufacturing simplicity through a systematic design approach.
2Adaptability or versatility
If different sized electrodes are used at different positions, then the electrode distribution adapts to the circular shape, but the capacitance differences cause poor uniformity in touch signals
Solution Approach 1:
The patent applies parameter changes by systematically varying the shape parameters of touch electrodes based on their radial position. Central electrodes maintain a square shape while peripheral electrodes transition to trapezoidal shapes with adjusted dimensions. This controlled parameter variation adapts the electrode distribution to the circular geometry while maintaining uniform capacitance values, thereby achieving both adaptability and signal uniformity.
3Area of stationary object
If peripheral electrodes are made larger to fit the circular region, then the circular touch region is fully utilized, but the capacitance difference between central and peripheral electrodes increases
Solution Approach 1:
The patent applies local quality by giving peripheral electrodes a trapezoidal shape with optimized dimensions that differ from central square electrodes. This local differentiation allows peripheral electrodes to effectively utilize the circular touch region area while their specific geometric parameters are adjusted to maintain uniform capacitance values, preventing capacitance imbalance between central and peripheral regions.
Data Source
AI summary
Provided is a touch panel. The touch panel includes a back plate and a touch electrode layer disposed on a side of the back plate, wherein the touch electrode layer has a circular touch region and includes a plurality of touch electrodes, the plurality of touch electrodes are distributed in the touch region, and any touch electrode distal from a periphery of the touch region has three side edges sequentially connected end to end.