Touch Display Signal Segmentation for Accurate Touch Sensing
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Solution Overview
Problem
Changes in signal levels for display modules interfere with the accuracy of touch operations in electronic devices, necessitating improved timing distribution to optimize touch operation accuracy.
Innovation Solution
A control circuit provides separate display driving signals during display and touch periods, ensuring they do not overlap, with a second display driving signal during touch periods optimized to a default voltage corresponding to the lowest brightness or grayscale value, reducing power consumption and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If display driving signals are provided continuously to the display module, then the display function is maintained, but signal interference occurs during touch operations reducing touch accuracy
Solution Approach 1:
The patent segments the display driving signal into two distinct types: a first display driving signal provided during display periods, and a second display driving signal provided during touch periods. This segmentation allows the control circuit to optimize signal characteristics for different operational contexts, specifically using a second display driving signal with different parameters (such as lower amplitude or different timing) during touch operations to minimize interference with touch sensing signals while maintaining display functionality.
Solution Approach 2:
The patent implements periodic action by alternating between display periods and touch periods in a cyclic manner. During each cycle, the control circuit switches between providing the first display driving signal (during display periods) and the second display driving signal (during touch periods). This periodic switching ensures that touch operations occur during dedicated time windows where display signal interference is minimized, thereby improving touch detection accuracy while maintaining continuous display functionality.
2Adaptability or versatility
If display and touch operations occur simultaneously, then both functions are available, but signal level changes interfere with touch operation accuracy
Solution Approach 1:
The patent segments the operational timeline into distinct display periods and touch periods, allowing different signal regimes to be applied for each function. During touch periods, the second display driving signal is provided with characteristics optimized to minimize interference, while during display periods, the first display driving signal provides full display functionality. This temporal segmentation enables both functions to operate with optimal performance in their respective time windows.
Solution Approach 2:
The patent implements dynamic switching of display driving signal characteristics based on the operational phase. The control circuit dynamically adjusts the display driving signal parameters (such as amplitude, timing, or waveform) depending on whether the system is in a display period or touch period. This dynamic adaptation allows the system to maintain both display and touch functionality while optimizing touch detection accuracy during touch periods by using a second display driving signal with reduced interference characteristics.
Data Source
AI summary
An electronic device is provided. The electronic device includes a touch module, a display module, and a control circuit. The display module includes multiple light emitting units. The control circuit is coupled to the touch module and the display module. During a display period, the control circuit provides a first display driving signal to the display module according to image data. During a touch period, the control circuit provides a touch driving signal to the touch module according to the image data. During the touch period, the control circuit provides a second display driving signal to the display module according to the image data. The touch period and the display period do not overlap. The first display driving signal is different from the second display driving signal.