Flexible Touch Panel Electrode Spacing for Curved Display Precision
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Solution Overview
Problem
Flexible touch panels face challenges in precisely determining touch coordinates due to variance in capacitance caused by different curvature degrees, leading to inaccurate touch point detection.
Innovation Solution
The flexible touch panel design includes driving and detection electrode patterns with varying distances between them, configured such that the difference in mutual capacitance changes in opposite directions across the panel, minimizing variance and ensuring precise touch event detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flexible touch panel is curved to satisfy consumer demand for flexible displays, then the adaptability and versatility of the touch panel is improved, but the measurement precision of touch coordinates deteriorates due to variance in mutual capacitance caused by different curvature degrees
Solution Approach 1:
The patent applies local quality by configuring different distances between driving and detection electrode patterns in different regions of the touch panel. Specifically, the distance is set to be smaller than a predetermined distance in first regions and larger than the predetermined distance in second regions. This non-uniform distribution compensates for the curvature-induced capacitance variance, allowing the panel to maintain measurement precision when curved while preserving flexibility.
2Manufacturing precision
If the distance between driving and detection electrode patterns is made uniform, then the manufacturing precision is improved, but the reliability of touch detection deteriorates when the panel is curved due to capacitance variance
Solution Approach 1:
The patent deliberately introduces local variations in electrode spacing to compensate for curvature effects. By setting specific distances in different regions rather than using a uniform distance, the design achieves reliable touch detection under curved conditions while maintaining manufacturability through clear distance specifications.
Solution Approach 2:
The patent changes the spatial parameter (distance between electrodes) as a function of position on the panel. The distance parameter is adjusted based on the expected curvature profile, with smaller distances in regions that will experience greater curvature-induced capacitance changes. This parameter optimization ensures reliable touch detection across the entire curved surface.
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 configuration reduces the variance in mutual capacitance, enabling accurate determination of touch coordinates even when the panel is curved, thereby enhancing the reliability of touch event detection.
Implementation Method 1
The capacitive touch panels are more popular as being capable of implementing multiple touches, which mainly relates to detecting sensing current of human body. The sensing capacitive touch panels includes a plurality of horizontal and vertical electrodes. When fingers have touched the touch panel, the capacitance between the electrodes may change
Data Source
AI summary
A flexible touch panel is disclosed. The flexible touch panel includes a plurality of driving electrode patterns and detection electrode patterns. A distance between the driving electrode patterns and detection electrode patterns is configured such that a difference of mutual capacitance between the driving electrode pattern and detection electrode pattern in different areas of the flexible touch panel has been changed in an opposite direction when the flexible touch panel has been curved. The difference of the mutual capacitance is the difference of the mutual capacitance before a touch event and after the touch event. In this way, the difference of the mutual capacitance caused by curved flexible touch panel may be decreased.