Multi-Area Display Refresh Control for Lower Power and Bandwidth
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Solution Overview
Problem
Conventional display panels waste power and bandwidth by transmitting full frame data to all areas, including those that do not require frequent screen refreshes, leading to inefficient power consumption and visual artifacts.
Innovation Solution
Implement a multi-area multi-frame-rate mode where a host transmits partial frame image data and selectively feeds back additional area refresh requests to the display driving device, allowing for partial or full frame data transmission based on display area needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If full frame data is transmitted to all display areas, then all areas can be refreshed at high frame rate, but power consumption and transmission bandwidth are wasted in areas that do not require frequent refreshes
Solution Approach 1:
The display panel is divided into multiple display areas with different refresh rate requirements. The driving device segments the incoming full frame data into area-specific data streams, allowing each area to receive only the data it needs for its specific refresh rate, thereby eliminating unnecessary power consumption and bandwidth usage in low-refresh areas
Solution Approach 2:
Different display areas are assigned different quality characteristics (refresh rates) based on their specific requirements. High-motion areas receive high frame rate data while static areas receive low frame rate data, optimizing the balance between visual quality and power consumption across different regions of the display
2Reliability
If the entire display panel operates at high frame rate, then visual quality is improved, but power consumption increases significantly
Solution Approach 1:
The system dynamically adjusts the refresh rate of different display areas based on their content requirements and user interaction states. Areas with static content automatically transition to lower refresh rates to save power, while areas with dynamic content maintain higher refresh rates to preserve visual quality
Solution Approach 2:
The refresh rate parameter is changed independently for different display areas based on their specific requirements. This allows the system to optimize power consumption by using lower refresh rates (e.g., 1Hz, 10Hz) for static areas while maintaining high refresh rates (e.g., 60Hz, 120Hz) for areas requiring smooth visual updates
3Use of energy by moving object
If mask signal is used to block scan lines for low frame rate areas, then power consumption is reduced, but full frame data transmission still wastes bandwidth
Solution Approach 1:
The system extracts only the necessary data portions for each display area from the incoming full frame data stream. By taking out only the relevant data for low-refresh areas and discarding unnecessary data, the system eliminates bandwidth waste while maintaining the power-saving benefits of selective refresh
Data Source
AI summary
The disclosure provides a display device, a display driving device, and an operation method thereof. The display device includes a host, a display panel, and the display driving device. In a multi-area multi-frame-rate mode, the host transmits partial frame image data to the display driving device in each of frame periods until the multi-area multi-frame-rate mode ends. In the multi-area multi-frame-rate mode, the display driving device selectively feeds back an additional area refresh request to the host. In the multi-area multi-frame-rate mode, in response to the additional area refresh request, the host transmits at least one additional display area image data to the display driving device in addition to transmitting the partial frame image data during at least one corresponding frame period corresponding to the additional area refresh request.