Touch Panel Pressure Detection Using Dynamic Range Adjustment
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Solution Overview
Problem
Existing touch panel systems that detect pressure and position struggle with accurately measuring pressure due to variations in the contact area by a pointer on the touch panel, leading to dispersed pressure and inaccurate readings.
Innovation Solution
A touch panel system that includes a touch panel with drive, position detection, and pressure detection electrodes, and a controller that determines a touch range based on position detection signals, sets a corresponding pressure detection range, and calculates pressure magnitude from signal values within this range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch panel detects pressure using a fixed detection range, then the detection process is simple, but the pressure detection accuracy deteriorates when contact area varies
Solution Approach 1:
The pressure detection range is dynamically adjusted based on the detected touch range. The controller determines the touch range from position detection electrode signals, then sets the pressure detection range to match this touch range, allowing the detection system to adapt to varying contact areas rather than using a fixed detection range
Solution Approach 2:
The system changes the parameter of detection range based on the detected touch characteristics. By modifying the pressure detection range parameter according to the touch range, the system maintains high detection accuracy across different contact areas without requiring complex additional hardware
2Measurement precision
If a fixed pressure detection range is used, then the system operation is simple, but pressure magnitude accuracy deteriorates with varying contact areas
Solution Approach 1:
The system performs preliminary detection of the touch range using position detection electrodes before conducting pressure detection. This preliminary action allows the system to pre-determine the appropriate pressure detection range, ensuring accurate pressure magnitude measurement while maintaining straightforward operation through automated sequential processing
3Measurement precision
If the pressure detection range is expanded to cover all possible touch areas, then large contact areas are detected accurately, but noise increases for small contact areas
Solution Approach 1:
The pressure detection range is locally optimized to match the actual touch range. By setting the detection range according to the detected touch area, the system concentrates detection resources precisely where needed, achieving high accuracy for both small and large contact areas without introducing noise from unrelated detection zones
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 approach allows for more accurate detection of pressure magnitude by accounting for the contact area, reducing noise and ensuring accurate pressure calculations even with varying contact sizes.
Implementation Method 1
a touch panel including a drive electrode, a position detection electrode, and a pressure detection electrode, and a controller that imparts a drive signal to the drive electrode, and acquires signal values from each of the position detection electrode and the pressure detection electrode
Data Source
AI summary
A touch panel system includes a touch panel including a drive electrode, a position detection electrode, and a pressure detection electrode, and a controller configured to impart a drive signal to the drive electrode and acquire a signal value from each of the position detection electrode and the pressure detection electrode. The controller is configured to detect a touch range by a pointer based on the signal value obtained from the position detection electrode, determine a pressure detection range corresponding to the touch range, of the signal value obtained from the pressure detection electrode, and calculate a magnitude of a pressure by the pointer based on the signal value in the pressure detection range.