Display Scan Driver Signal Width Control for Variable Refresh Rates
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Solution Overview
Problem
Display devices face issues with high power consumption and decreased visibility due to frequent frame conversion and the use of various refresh rates, particularly when displaying images for movies or electronic games.
Innovation Solution
A display device with a scan driver and timing controller that supplies enable scan and initialization signals with varying widths to different areas of the display panel during an active frame, optimizing signal distribution to enhance visibility and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequent frame conversion is performed to display images for movies or electronic games, then the display can keep up with dynamic content, but power consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the scan signal width adjustable based on the display mode. In full refresh mode, all scan lines receive full-width scan signals for complete image refresh. In partial refresh mode, only specific scan lines receiving initialization signals get extended scan signals, while others use reduced width signals. This dynamic adjustment of scan signal parameters based on operational needs resolves the contradiction between maintaining high frame conversion capability and reducing power consumption.
Solution Approach 2:
The patent implements local quality by differentiating the treatment of different scan line regions. Scan lines that receive initialization signals during the blank period are provided with extended width scan signals during the active period, while other scan lines use standard width signals. This localized differentiation allows the display to maintain image quality in critical regions while reducing overall power consumption by not uniformly applying high-resource operations across the entire display panel.
2Adaptability or versatility
If various refresh rates are used to adapt to different display needs, then the display can optimize performance for different content types, but visibility decreases
Solution Approach 1:
The patent applies preliminary action by supplying initialization signals to specific scan lines during the blank period before the active period begins. This preliminary initialization ensures that these scan lines are prepared and stable before receiving data signals, which maintains image quality and visibility even when operating at variable refresh rates. The initialization occurs in advance, allowing the display to adapt to different refresh rates without compromising the visibility of the displayed content.
3Device complexity
If enable scan signals with uniform width are supplied to all scan lines, then the circuit design is simple, but power consumption increases and image quality may be compromised in certain regions
Solution Approach 1:
The patent implements local quality by differentiating the treatment of different scan line regions. Scan lines that receive initialization signals during the blank period are provided with extended width scan signals during the active period, while other scan lines use standard width signals. This localized differentiation allows the display to maintain image quality in critical regions while reducing overall power consumption by not uniformly applying high-resource operations across the entire display panel.
Data Source
AI summary
A display device includes a display panel, a scan driver, and a timing controller. The display panel includes pixels connected to scan lines and initialization lines. The scan driver includes first stages configured to supply enable scan signals to the scan lines during an active period of one frame, and second stages configured to supply enable initialization signals to the initialization lines during the active period and a blank period of the one frame. The timing controller is configured to supply scan clock signals and initialization clock signals to the scan driver. When the enable initialization signals are supplied in an overlapping manner to two of the initialization lines during the active period of a current frame, the enable scan signals having different widths are supplied to respective areas of the display panel.