Display Device Scan Driver Timing Control for Image Quality
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Solution Overview
Problem
Display devices face challenges in maintaining image quality and preventing characteristic differences between pixel regions when switching between display modes, particularly in high-speed driving scenarios, leading to issues like image sticking and light leakage.
Innovation Solution
A display device with multiple pixel regions and dedicated scan drivers, where the timing controller manages distinct start signals and scan signal durations to ensure synchronized and efficient operation across regions, even during high-speed driving, thereby minimizing characteristic differences and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the display device drives scan lines at high speed to improve productivity, then the frame rate increases, but image sticking and light leakage occur due to insufficient scanning time for all pixel regions
Solution Approach 1:
The display device divides the pixel regions into multiple groups and assigns different scanning strategies to each group. Some pixel regions receive multiple scan signals while others receive fewer scans, segmenting the scanning resource allocation to prevent image sticking in regions that need it while maintaining high speed overall
Solution Approach 2:
The scanning system dynamically adjusts the number of scan signals supplied to different pixel regions based on their specific needs. The scan driver can vary scanning parameters in real-time, providing more scans to regions prone to image sticking and fewer scans to regions that can keep up with high-speed scanning
2Device complexity
If the display device uses a single scanning strategy for all pixel regions, then the device complexity is reduced, but characteristic differences between pixel regions cause image quality degradation
Solution Approach 1:
Different pixel regions are assigned different scanning characteristics and parameters. The scan driver provides customized scanning patterns to different regions based on their specific requirements, with some regions receiving more scan signals or different timing parameters to compensate for their susceptibility to image sticking
3Ease of operation
If the display device supplies equal number of scan signals to all pixel regions, then the ease of operation is improved, but regions with different scanning requirements exhibit characteristic differences
Solution Approach 1:
The scan driver changes scanning parameters such as the number of scan signals, scanning frequency, and timing characteristics for different pixel regions. This parameter differentiation allows each region to be optimized for its specific characteristics while maintaining overall system operation
Data Source
AI summary
A display device includes: first and second pixel regions, wherein the display device displays an effective image in the first and second pixel regions, corresponding to a first mode, and displays an effective image in the second pixel region, corresponding to a second mode; first pixels and first scan lines in the first pixel region; second pixels and second scan lines in the second pixel region; a first scan driver comprising first scan stages configured to drive at least some of the first scan lines; a second scan driver comprising second scan stages configured to drive the second scan lines; and a timing controller configured to supply first and second start signals to the first and second scan drivers, wherein, when the display device is driven in the second mode, a width of the second start signal is set wider than a width of the first start signal.