Force Touch Display Device Using Optical Deformation Detection
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Solution Overview
Problem
Conventional force touch technologies in electronic devices, such as capacitive and resistive types, suffer from low touch accuracy and sensitivity.
Innovation Solution
A force touch display device equipped with a force touch detecting module that measures the deformation of the display panel to determine the force level of a touch, allowing for accurate differentiation between light touch and pressing operations without interference from surrounding electric signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive type force touch is used, then the device can detect touch force, but the touch accuracy and sensitivity are not high
Solution Approach 1:
The patent replaces capacitive sensing (electrical field-based) with optical sensing. A light source emits light through the display panel, and a sensor detects light intensity changes caused by panel deformation under touch force. This optical substitution eliminates interference from surrounding electric signals and provides higher measurement precision and detection sensitivity.
Solution Approach 2:
The patent changes the detection parameter from electrical capacitance to optical light intensity. By measuring the intensity of light transmitted through or reflected from the display panel, the system can accurately detect panel deformation and corresponding touch force levels without the limitations of capacitive sensing.
2Measurement precision
If resistive type force touch is used, then the device can detect touch force, but the touch accuracy and sensitivity are not high
Solution Approach 1:
The patent replaces resistive sensing (mechanical contact-based) with optical sensing. Instead of measuring electrical resistance changes from panel deformation, the system uses light intensity detection to measure the same deformation, achieving higher accuracy and sensitivity without the limitations of resistive technology.
3Measurement precision
If optical detection method is used to detect light intensity, then the force level can be accurately determined, but the device complexity increases
Solution Approach 1:
The patent makes the display panel serve dual functions: both displaying visual information and acting as an optical transmission medium for force touch detection. The same panel structure that displays images also transmits light from the light source to the sensor, enabling force detection without adding separate dedicated optical components.
Solution Approach 2:
The display panel itself serves the detection function by transmitting light and allowing the sensor to detect intensity changes. The panel's inherent optical properties are utilized for sensing, eliminating the need for separate sensing structures and reducing overall device complexity despite the sophisticated detection capability.
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 enhances detection accuracy and sensitivity, enabling precise operation differentiation based on touch force levels, improving user interaction with electronic devices like smartphones and smart watches.
Implementation Method 1
measuring a distance between the force touch detecting module substrate and the display panel so as to determine the amount of deformation of the force touch display device
Implementation Method 2
the force touch detecting module is configured to detect an amount of deformation of the force touch display device so as to determine a force level of a touch force applied on the display panel
Data Source
AI summary
A force touch display device, comprising a display panel and a force touch detecting module, wherein the force touch detecting module is arranged opposite to the display panel, and the force touch detecting module is configured to detect an amount of deformation of the force touch display device so as to determine a force level of a touch force. A force touch control method is also disclosed.