Asymmetric Auxiliary Electrode Layout for Low-Visibility Touch Sensors
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Solution Overview
Problem
Existing electronic devices face challenges in achieving high touch sensitivity and maintaining low visibility, particularly due to the visibility of sensor structures and interference from external light reflections.
Innovation Solution
The electronic device incorporates a touch structure with asymmetrically designed auxiliary electrodes between sensor electrodes, which are electrically disconnected and do not receive additional signals, enhancing touch sensitivity while minimizing visibility and reducing sensor recognition through external light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor structures are added to improve touch sensitivity, then touch sensitivity is improved, but visibility deteriorates due to sensor recognition through external light reflection
Solution Approach 1:
The patent applies asymmetry by designing auxiliary electrodes with different shapes on opposite sides. The first auxiliary electrode has a first shape facing the first sensor electrode and a second shape facing the second sensor electrode, where the first shape and second shape are different. This asymmetric design creates different capacitance values for adjacent sensor electrodes, enabling the sensor to distinguish between touch input and auxiliary electrode interference, thereby improving touch sensitivity while maintaining visibility by allowing the auxiliary electrodes to be positioned without compromising aesthetic appearance
2Measurement precision
If auxiliary electrodes are added between sensor electrodes to enhance sensitivity, then touch sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent merges the auxiliary electrode function with the existing electrode structure by positioning auxiliary electrodes between sensor electrodes and integrating them into the same capacitive sensing system. The auxiliary electrodes share the same basic structure and material properties as the sensor electrodes, combining multiple functions (sensing and interference cancellation) within a unified electrode architecture rather than adding separate complex components
Solution Approach 2:
The patent applies local quality by making each auxiliary electrode have different shapes on different sides (first shape facing first sensor electrode, second shape facing second sensor electrode). This localized variation in geometry allows each auxiliary electrode to be optimally configured for its specific position and function, improving overall system performance without requiring complete redesign of all electrodes
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 improves touch sensitivity and reduces the visibility of sensor structures, providing a more pleasant user experience by maintaining high sensitivity and reducing external light interference.
Implementation Method 1
the touch structure includes a plurality of first sensor electrodes SP1, a plurality of second sensor electrodes SP2, and a plurality of auxiliary electrodes IMP
Data Source
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AI summary
An electronic device includes a first electrode, a second electrode, and a third electrode. The first electrode includes a first boundary side extending in a direction. The second electrode includes a second boundary side extending in the direction. The third electrode is disposed between and spaced apart from the first electrode and the second electrode. The third electrode includes a first side facing the first boundary side and a second side facing the second boundary. The first side and the second side have shapes that are asymmetric to each other with respect to a center axis extending in the direction.