Integrated Touch Sensing Device with Strain Gauge Electrodes
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Solution Overview
Problem
Current display devices lack an integrated solution for detecting both touch position and touch pressure effectively, requiring separate modules and increasing device thickness.
Innovation Solution
A touch sensing device with a specific configuration of sensing electrodes and Wheatstone bridge circuits that allows for the detection of touch position and pressure through a single module, utilizing strain gauges and capacitance changes to sense pressure and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate modules are used for detecting touch position and pressure, then detection functionality is complete, but device thickness increases
Solution Approach 1:
The patent combines touch position sensing electrodes and pressure sensing electrodes into a single integrated touch sensing panel. The position sensing electrodes are arranged in a first direction while pressure sensing electrodes are arranged in a second direction perpendicular to the first direction, allowing both position and pressure detection functions to be merged in one layer structure, thereby reducing device thickness while maintaining complete detection functionality.
2Measurement precision
If multiple sensing electrodes are directly connected to form strain gauges, then pressure sensing capability is improved, but device complexity increases
Solution Approach 1:
The patent divides the sensing electrode structure into distinct functional segments: position sensing electrodes arranged in rows and pressure sensing electrodes arranged in columns. By segmenting the electrode connections into separate strain gauge units (with at least two electrodes connected in series to form a resistance sensing element), the patent achieves precise pressure sensing while maintaining manageable structural complexity through modular organization.
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
Enables simultaneous detection of touch position and pressure, reducing device thickness and enhancing user convenience by integrating touch sensing into a single panel, minimizing noise and improving sensing accuracy through time-division driving.
Implementation Method 1
a Wheatstone bridge circuit unit electrically connected to a first strain gauge, and the at least two directly connected second sensing electrodes form the first strain gauge
Implementation Method 2
detect a touch pressure through a resistance sensing method
Implementation Method 3
a first sensing electrode and a fourth sensing electrode that overlap the first sensing electrode, the second sensing electrode and a third sensing electrode that overlap the second sensing electrode
Data Source
AI summary
A touch sensing device includes a first base layer, a plurality of first sensing electrodes disposed on the first base layer and spaced apart in a first direction, a plurality of second sensing electrodes disposed on a same layer as the first sensing electrodes and arranged in different rows from the first sensing electrodes, a plurality of third sensing electrodes on the second sensing electrodes that are spaced apart along a second direction different from the first direction and that overlap the second sensing electrodes, and a plurality of fourth sensing electrodes on the first sensing electrodes that are spaced apart along the second direction and that overlap the first sensing electrodes. At least two of the second sensing electrodes are directly connected to each other.