Touch Display Panel Force Sensing via Elastic Support
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Solution Overview
Problem
Touch screen devices often fail to accurately sense the amount of touch force or pressure applied, leading to inaccuracies in user input detection.
Innovation Solution
The implementation of a touch display panel with a mutual capacitor structure, comprising a first electrode layer with a mesh pattern and a second electrode layer with touch and force sensing electrodes, along with elastic supporting elements that deform to increase the detectable range of touch forces, and a driving circuit that alternates between display, touch position sensing, and touch force sensing periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional touch screen device is used, then it can display images and receive touch commands, but it does not accurately sense the amount of touch force or pressure applied
Solution Approach 1:
The patent combines touch position sensing and touch force sensing functions into a single mutual capacitor structure. The first electrode layer with mesh pattern and second electrode layer with touch and force sensing electrodes work together to detect both position and force, eliminating the need for separate sensing mechanisms and improving force sensing accuracy without proportionally increasing complexity.
Solution Approach 2:
The patent introduces elastic supporting elements that deform in response to applied touch force. This dynamic mechanical response translates force magnitude into measurable capacitance changes, enabling accurate force sensing. The elastic deformation provides a direct physical mechanism that converts mechanical pressure into electrical signals for precise measurement.
2Adaptability or versatility
If elastic supporting elements are added to increase detectable range of touch forces, then the range of detectable forces is improved, but the device structure becomes more complex
Solution Approach 1:
The elastic supporting elements serve multiple functions simultaneously: they provide mechanical support for the electrode layers, enable force sensing through deformation, and expand the detectable force range. This multi-functionality increases adaptability without adding separate dedicated components for each function, thereby limiting the increase in overall device complexity.
3Measurement precision
If the driving circuit alternates between display, touch position sensing, and touch force sensing periods, then accurate detection of both position and force is achieved, but the time required for complete sensing cycle increases
Solution Approach 1:
The driving circuit uses periodic alternating periods for display, touch position sensing, and touch force sensing. This time-division multiplexing approach allows accurate detection of both position and force by sequentially activating different sensing modes. The periodic switching enables complete sensing cycles while managing time requirements through structured temporal allocation of different sensing functions.
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 solution enables accurate detection of a wider range of touch forces, improving the accuracy of user input by varying capacitance in response to applied pressure, enhancing the overall performance of touch screen devices.
Implementation Method 1
a mutual capacitor C structure configured for detecting the touch force applied on the touch display device. When a touch force is applied on the front cover, the distance between the force sensing electrode and the first electrode layer changes, and a capacitance of the mutual capacitor C changes
Implementation Method 2
Each supporting element 151 is elastic. The supporting elements are configured for elastically resisting against the touch display module
Data Source
AI summary
A touch display device includes a touch display module. The touch display module includes a TFT substrate, a color filtering substrate, and a liquid crystal layer encapsulated between the TFT substrate and the color filtering substrate. A first electrode layer is formed on a surface of the color filtering substrate facing the TFT substrate. A second electrode layer is formed on a surface of the TFT substrate facing the color filtering substrate. The touch display device further includes at least one supporting element on a side of the touch display module. The supporting element is elastic and configured for elastically resisting against the touch display module.