Peripheral Comb Electrode Layout for Accurate Touch Detection
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Solution Overview
Problem
Wearable devices with touch detection functions face challenges in achieving both high display quality and operability, particularly in efficiently detecting touch inputs using capacitive sensing.
Innovation Solution
The display device incorporates detection electrodes with body and comb tooth portions or tapered portions, arranged in specific configurations to allow precise touch detection by analyzing signal ratios from these electrodes, reducing the number of electrodes required and enhancing touch detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of detection electrodes is increased to improve touch detection accuracy, then measurement precision is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The detection electrode is divided into multiple independent sensing regions (first sensing region, second sensing region, third sensing region) with different shapes and orientations. Each region detects touch inputs in specific zones, allowing comprehensive coverage and accurate localization without requiring multiple separate electrodes. The segmented design enables precise touch detection while maintaining a single electrode structure.
Solution Approach 2:
The patent uses comb-shaped electrode patterns where teeth extend in perpendicular directions (first direction and second direction). By analyzing signal ratios between electrodes oriented in different directions, the system determines touch position in two dimensions. This dimensional approach allows accurate touch localization without increasing the number of electrodes.
2Reliability
If more detection electrodes are added to enhance touch sensitivity, then touch detection capability is improved, but ease of manufacture deteriorates
Solution Approach 1:
Multiple sensing functions are merged into a single detection electrode structure. The electrode contains first, second, and third sensing regions with different orientations that collectively provide comprehensive touch detection. This merging reduces manufacturing complexity compared to using separate electrodes for each sensing direction while maintaining high touch sensitivity through the combined signal analysis.
3Measurement precision
If detection electrodes are arranged densely to improve touch detection precision, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensing regions are designed with asymmetric shapes and orientations - first sensing regions extend in a first direction, second sensing regions in a second direction, and third sensing regions in a third direction. This asymmetric arrangement allows the electrode to detect touch positions accurately by comparing signal ratios from differently oriented regions, achieving precise localization without requiring symmetric or densely packed electrode patterns.
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 enables efficient and accurate touch detection, improving the overall operability and display quality of wearable devices by minimizing the number of detection electrodes and associated wiring, while maintaining effective touch sensitivity.
Implementation Method 1
wearable devices with a touch detection function... efficient and accurate touch detection... analyzing signal ratios from these electrodes
Data Source
AI summary
According to one embodiment, a display device includes a display area, a first sensor electrode, a second sensor electrode and a detector. The display area displays an image. The first sensor electrode is disposed in a peripheral area surrounding the display area. The second sensor electrode is disposed in the peripheral area and disposed adjacent to the first sensor electrode. The detector is electrically connected to the first sensor electrode and the second sensor electrode. The first sensor electrode and the second sensor electrode both have a body portion and a comb tooth portion having a plurality of linear electrodes. A comb tooth portion of the first sensor electrode and a comb tooth portion of the second sensor electrode are disposed at mutually different locations.