3D Touch Control Device With Pressure-Sensing Layer
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Solution Overview
Problem
Current touch control devices lack the ability to effectively detect the strength and position of touch in three dimensions, limiting their functionality in human-computer interaction.
Innovation Solution
A touch control device comprising a protective cover, a flat touch sensing layer with first and second direction-detection electrodes, and a pressure-sensing layer with pressure-sensing units, where the pressure-sensing layer is positioned between the protective cover and the flat touch sensing layer to detect changes in resistance corresponding to touch strength, enabling 3D touch control by combining 2D sensing with Z-direction detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional 2D touch sensing layer is used, then the device structure is simple, but the touch detection capability is limited to two dimensions
Solution Approach 1:
The patent introduces a pressure-sensing layer positioned between the protective cover and the flat touch sensing layer to add Z-direction pressure detection capability. This transforms the system from 2D touch detection to 3D touch detection by detecting pressure changes in the vertical dimension, enabling the device to sense both touch position and touch strength simultaneously.
2Measurement precision
If a pressure-sensing layer is added to enable 3D detection, then touch strength detection is improved, but the device structure becomes more complex
Solution Approach 1:
The touch control device is divided into functionally independent layers: a protective cover layer for structural protection, a pressure-sensing layer for detecting touch strength through resistance changes, and a flat touch sensing layer for detecting touch position. Each layer performs a specific function, allowing the system to achieve 3D detection capability while maintaining modular structure and ease of manufacturing.
3Measurement precision
If the pressure-sensing units overlap with the flat sensing pattern, then 3D detection accuracy is improved, but signal interference increases
Solution Approach 1:
The patent specifies that the projection of the pressure-sensing unit pattern onto the flat touch sensing layer should have an overlap ratio of no more than 5% with the flat sensing pattern. This local quality control ensures that while the pressure-sensing units are positioned to detect Z-direction pressure changes accurately, their projection onto the XY-plane does not significantly interfere with the touch position detection signals, thus balancing 3D detection accuracy with signal integrity.
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
The solution allows for precise detection of touch strength and position in three dimensions, enhancing the sensitivity and responsiveness of touch control devices, thereby improving human-computer interaction capabilities.
Implementation Method 1
the pressure-sensing layer...comprises at least one pressure-sensing unit constituting a first pattern...to detect changes in resistance corresponding to touch strength
Implementation Method 2
a capacitive detection system utilizes capacitors to serve as detectors. Therefore, when the user touches different positions, the detection system calculates the amount of change in all capacitors and generates output t signals corresponding to the touched position
Data Source
AI summary
A touch control device is provided. A protective cover protects the touch control device and includes a top-surface to sustain a touch action performed by the user. A flat touch sensing layer includes many first direction-detection electrodes second direction-detection electrodes. The fast and second direction-detection electrodes are isolated by a transparent insulating material at the position where the first direction-detection electrodes cross the second direction-detection electrodes. The first and second direction-detection electrodes constitute a flat sensing pattern. A pressure-sensing layer is disposed between the protective cover and the flat touch sensing layer and includes at least one pressure-sensing unit constituting a first pattern. The overlap ratio between the projection of the first pattern onto the flat touch sensing layer and the flat sensing pattern is less than or equal to about 5% of the flat sensing pattern.