Touch Detection Period Extension in Display Devices
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Solution Overview
Problem
Display devices with touch detection functions face challenges in maintaining touch detection accuracy due to the reduction in touch detection period length, which is compromised by the increasing frequency of display operations, leading to insufficient detection of touch signals.
Innovation Solution
Implementing a display device with a touch detection function that performs display and touch detection operations in a time-division manner, where the touch detection period is longer than the display period, utilizing a clock generator and counters to synchronize and extend the detection period, ensuring accurate touch detection despite increased display operation frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frequency of display operation is increased, then the display refresh rate is improved, but the touch detection period length is reduced leading to decreased touch detection accuracy
Solution Approach 1:
The patent implements dynamic time-division multiplexing where the display period and touch detection period are dynamically adjusted based on operational requirements. The touch detection period is set to be longer than the display period, allowing sufficient time for accurate touch signal detection while maintaining high display refresh rates. This dynamic allocation of time resources resolves the contradiction by making the system adaptable to both high-speed display updates and precise touch detection needs.
Solution Approach 2:
The patent employs periodic alternating operations between display mode and touch detection mode. During each frame period, the system periodically switches between performing display operations and performing touch detection operations. This periodic action allows the system to maintain high display refresh rates while ensuring that touch detection occurs in dedicated time slots with sufficient duration to achieve accurate detection, thus resolving the time resource conflict.
2Measurement precision
If the touch detection period is extended to improve detection accuracy, then the touch detection accuracy is improved, but the display operation frequency is reduced
Solution Approach 1:
The patent segments the frame period into distinct display operation intervals and touch detection intervals. By dividing the time resource into separate segments, the system can allocate sufficient time to touch detection operations without compromising the overall display refresh rate. This segmentation allows touch detection to occur in dedicated time slots with adequate duration, ensuring detection accuracy while maintaining high display operation frequency through efficient time utilization.
Solution Approach 2:
The patent ensures continuous operation by overlapping or sequentially arranging display and touch detection operations within each frame period. The system maintains continuous useful action by ensuring that touch detection operations are performed without interruption in their allocated time slots, while display operations continue in their allocated slots. This continuous operation approach maximizes the utilization of time resources, allowing both functions to operate at high frequencies without mutual interference.
Data Source
AI summary
Each of frame display periods is for performing a display operation based on image information on one frame and each of detection surface touch detection periods is from when touch detection is started to when the detection is completed on the entire detection surface. At least one frame display period of the frame display periods and at least one detection surface touch detection period of the detection surface touch detection periods are started based on a display synchronization signal. The display operation and the touch detection operation are performed in a time-division manner in the one frame display period. The length of the one detection surface touch detection period is longer than the one length of the frame display period.