Multi-Layer Touch Sensor Ghost Touch Resolution
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Solution Overview
Problem
Touch sensors in display devices often suffer from 'ghost touch' issues, where incorrect touch locations are detected, leading to inaccurate input recognition.
Innovation Solution
A touch sensor system with a layered structure comprising first and second touch electrodes extending in intersecting directions, and third and fourth touch electrodes, allowing for the differentiation between actual touch points and ghost touch points through capacitance detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional touch sensor with electrodes in two directions (columns and rows) is used, then the device can detect touch locations, but ghost touch occurs where incorrect touch locations are detected
Solution Approach 1:
The touch sensor is divided into multiple independent touch sensor layers, each with its own electrode patterns. The first touch sensor layer has first and second touch electrodes extending in first and second directions, while the second touch sensor layer has third and fourth touch electrodes extending in third and fourth directions. By segmenting the detection function across multiple layers with different electrode orientations, the system can distinguish between actual touches and ghost touches through comparative analysis of detection results from different layers.
2Ease of operation
If touch electrodes are arranged in intersecting directions to detect touch locations, then touch input can be recognized, but the complexity of the electrode arrangement increases
Solution Approach 1:
The patent adds a new dimension to the electrode arrangement by stacking multiple touch sensor layers vertically. Instead of increasing the complexity within a single plane, the solution moves to a three-dimensional configuration where each layer has simplified electrode patterns (extending in two different directions), but the overall system achieves enhanced functionality through the vertical stacking of these simpler layers.
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
Enhances the accuracy of touch detection by discerning between actual touch points and ghost touch points, improving the reliability of user input recognition in display devices.
Implementation Method 1
allowing for the differentiation between actual touch points and ghost touch points through capacitance detection
Data Source
AI summary
A touch sensor has a first touch electrode extending in a first direction, a second touch electrode extending in a second direction intersecting the first direction, a third touch electrode extending in a third direction intersecting between the first direction and the second direction, and a fourth touch electrode extending in a fourth direction intersecting the third direction, the first touch electrode is in the same layer as the second touch electrode.