Touch-Synchronized Display Scanning for Faster Image Updates
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Solution Overview
Problem
Existing reflective display devices, such as electronic paper, struggle to match the update speed of the display with the input speed of user signals, particularly in touch input scenarios, leading to delayed real-time display of changes.
Innovation Solution
The driving circuit divides scan lines into multiple groups and selectively scans different parts of the display panel in alternating frames to synchronize the display update with touch input signals, allowing for faster response times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the display device scans all scan lines in each display frame to update the entire display panel, then the display completeness is maintained, but the update speed cannot match the touch input speed
Solution Approach 1:
The patent divides the scan lines into multiple groups (first group, second group, third group, etc.) and updates different groups in alternating display frames. Instead of scanning all scan lines in each frame, the system selectively scans only one group per frame, thereby halving the effective scanning interval for each group and improving the display update speed to match touch input responsiveness.
2Speed
If the display device increases the scanning frequency to match touch input speed, then the responsiveness improves, but the power consumption increases
Solution Approach 1:
The patent implements periodic scanning where different groups of scan lines are activated in alternating periods (display frames). Each group is scanned at a reduced frequency, but the effective response time is improved because each group gets updated more frequently than if all lines were scanned together. This periodic selective scanning reduces overall power consumption while maintaining touch responsiveness.
3Speed
If the display device scans only part of the scan lines in each frame to improve update speed, then the responsiveness improves, but the display completeness may be compromised
Solution Approach 1:
The patent ensures display completeness by systematically rotating through different groups of scan lines across consecutive display frames. Each group is guaranteed to be updated periodically, ensuring that the entire display panel remains complete and accurate. The alternating frame structure ensures no area is permanently neglected, maintaining reliability while improving speed.
Data Source
AI summary
An image processing device, comprising a touch circuit and a driving circuit. The touch circuit is configured to obtain a plurality of touch signals in a plurality of touch frames. The driving circuit is coupled to the touch circuit to obtain the plurality of touch signals, and is coupled to a display panel through a plurality of scan lines. The driving circuit is configured to scan a first part of the plurality of scan lines in a first display frame according to the plurality of touch signals to update a first image in a first area of the display panel. The driving circuit is configured to scan a second part of the plurality of scan lines in a second display frame according to the plurality of touch signals to update the first image in a second area of the display panel.