Interdigitatable Electrode Design for Touch Panel Sensitivity
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Solution Overview
Problem
Current touch sensors face challenges in achieving accurate touch sensing due to limitations in electrode design, leading to inconsistent sensitivity and signal strength across the touch-sensitive area.
Innovation Solution
The design incorporates a plurality of arms with digits extending from each arm, forming a specific pattern of electrodes that interdigitate and capacitively couple, enhancing the uniformity of sensitivity and signal strength by filling spaces between electrodes, thereby improving accuracy and sensitivity across the touch panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrode designs are used, then manufacturing simplicity is maintained, but touch sensing accuracy and sensitivity uniformity deteriorate
Solution Approach 1:
The electrode is divided into multiple arms with digits extending from each arm, creating a segmented structure that fills spaces between adjacent electrodes. This segmentation increases the number of capacitive nodes and improves touch sensing accuracy while maintaining a systematic manufacturing approach.
Solution Approach 2:
The electrode design extends from a simple linear or planar structure to a multi-dimensional configuration with arms and digits protruding in multiple directions. This dimensional expansion creates additional capacitive coupling points and fills previously empty spaces, enhancing sensitivity uniformity across the touch panel.
2Reliability
If simple electrode patterns are used, then manufacturing cost is reduced, but signal strength and sensitivity uniformity deteriorate
Solution Approach 1:
The electrode structure implements local quality variations by adding digits to specific regions where enhanced capacitive coupling is needed. This localized enhancement improves signal strength consistency in critical areas without requiring complex structures throughout the entire electrode, balancing manufacturing ease with performance reliability.
Solution Approach 2:
The digit structures are nested within or between the arm structures, creating a compact hierarchical configuration. This nesting approach maximizes the capacitive node density within the available space without proportionally increasing manufacturing complexity, as the digits and arms can be formed in integrated processing steps.
3Measurement precision
If densely packed electrodes are used, then sensitivity coverage is improved, but manufacturing precision requirements increase
Solution Approach 1:
The electrode design incorporates pre-calculated arm and digit configurations that are optimized to achieve uniform sensitivity coverage. By establishing the arm and digit positions, lengths, and orientations in advance during the design phase, the manufacturing process benefits from predetermined spacing requirements rather than requiring real-time precision adjustments.
Solution Approach 2:
The electrode structure combines multiple functional elements (arms, digits, and inter-arm spaces) into a composite configuration that achieves enhanced sensitivity coverage. This composite design distributes the sensitivity enhancement across multiple structural components rather than requiring uniformly dense electrode packing throughout, reducing the overall manufacturing precision burden.
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 results in improved accuracy and uniform sensitivity, increased signal size from capacitive nodes, and enhanced performance in detecting touch or proximity inputs, while maintaining thinness, transparency, and low manufacturing costs.
Implementation Method 1
each of the arms includes at least one digit protruding therefrom in a direction substantially parallel to the longitudinal direction of the electrode. The plurality of arms and digits interdigitate and capacitively couple to one another, thereby filling spaces between adjacent electrodes or interdigitatable electrodes.
Data Source
AI summary
Disclosed is an interdigitatable electrode for a touch panel, a touch panel including the same, and a terminal device with the touch panel, the electrode including a plurality of arms, each of at least one of which further includes at least one digit extending therefrom. A significantly improved accuracy performance of touch sensing would be expected.