Display Device Scan Pause Mode for Touch Detection
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Solution Overview
Problem
The existing display devices face challenges in improving detection accuracy and frequency due to the influence of drive signals, particularly during scanning periods, which limits the operation of touch panels in achieving handwriting input at required frequencies.
Innovation Solution
A display device configuration that alternately repeats scan and pause modes multiple times per frame, allowing for increased pause periods where detection command signals are sent to external detection devices, enabling more frequent and accurate detection operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the display device operates in continuous scanning mode, then the display refresh is maintained at 60 Hz, but the touch panel detection frequency cannot reach the required 100 Hz for handwriting input
Solution Approach 1:
The display device alternates between scan modes and pause modes in periodic cycles. During pause modes, the display scanning is temporarily suspended to allow the touch panel detection to operate without interference from drive signals. This periodic switching enables the detection frequency to reach 100 Hz while maintaining display refresh at 60 Hz, as the pause modes provide clean detection windows approximately every 10 milliseconds.
2Productivity
If the display device increases the number of pause modes for detection, then the detection frequency increases, but the display refresh may be affected
Solution Approach 1:
The system dynamically adjusts the scanning operation by introducing pause modes at specific intervals during the frame period. The pause modes are strategically positioned to allow detection operations without disrupting the overall display refresh cycle. The scan modes continue to operate normally between pause modes, ensuring that the display refresh stability is maintained while enabling high-frequency detection.
3Duration of action of moving object
If the scanning period is extended to maintain display quality, then the non-scanning period becomes too short for adequate detection, but shortening the scanning period may affect display refresh quality
Solution Approach 1:
The frame period is segmented into multiple scan modes and pause modes rather than a single continuous scan. This segmentation creates multiple opportunities for detection within each frame period, effectively increasing the total non-scanning time available for detection. The pause modes are distributed throughout the frame period, providing adequate detection windows without extending the overall scanning duration, thus maintaining both detection accuracy and display refresh quality.
Data Source
AI summary
A display device includes: a display element for displaying an image on a screen; and driving means for driving the display element so that a scan mode for carrying out scanning and a pause mode for pausing the scanning are alternately repeated. The driving means drives, by transmitting a pause and drive control signal to the display element, the display element so that scanning of a single frame is carried out by going through the scan mode twice and the pause mode twice. During the pause mode, the driving means outputs, to a touch panel, a detection command signal which commands that detection be carried out.