Multi-Area Display Scanning With Variable Scan Rates for Lower Power
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Solution Overview
Problem
Existing display devices with multiple display areas face challenges in efficiently managing power consumption and display efficiency, particularly when only some areas are actively driven.
Innovation Solution
The display device employs a segmented driving approach with different scan and clock frequencies for different display areas, using multiple sub-frames within a frame duration to selectively activate specific areas, reducing unnecessary image driving and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If all display areas are driven at the same scan rate, then display consistency is maintained, but power consumption increases unnecessarily when only some areas are active
Solution Approach 1:
The display panel is divided into multiple independent display areas (first display area and second display area), each capable of being driven independently at different scan rates. The scan driving circuit sequentially activates different display areas based on operation mode, allowing the first display area to be driven at a first scan rate while the second display area is driven at a second scan rate, thereby reducing power consumption when only certain areas are needed.
2Use of energy by moving object
If scan rate is reduced to lower power consumption, then energy efficiency improves, but display responsiveness and operating speed deteriorate
Solution Approach 1:
Different display areas are assigned different scan rates based on their specific requirements. The first display area can operate at a higher scan rate for better responsiveness when needed, while the second display area operates at a lower scan rate to reduce power consumption. This localized differentiation allows each area to have optimal performance characteristics suited to its function.
Solution Approach 2:
The scan driving circuit dynamically adjusts the scan rate for different display areas based on the operation mode. In a first operation mode, both areas are driven at a first scan rate; in a second operation mode, the second display area is driven at a lower second scan rate. This dynamic adaptation allows the system to optimize between power consumption and display performance in real-time.
3Adaptability or versatility
If multiple display areas are activated simultaneously, then functionality and versatility improve, but power consumption and processing complexity increase
Solution Approach 1:
The display is segmented into multiple independent areas that can be activated selectively. The scan driving circuit is configured to sequentially activate different display areas based on the operation mode, allowing the system to drive only the necessary areas at any given time. This segmentation enables versatile multi-area functionality while consuming power only for the active areas.
Solution Approach 2:
The scan driving circuit uses periodic scanning to activate different display areas in sequence rather than simultaneously. By controlling the timing and sequence of activation for the first and second display areas, the system achieves multi-area functionality while reducing peak power consumption and processing requirements compared to simultaneous activation of all areas.
Data Source
AI summary
A display device includes a plurality of pixels connected to scan lines and data lines, a data driving circuit that outputs data signals to the pixels via the data lines, a scan driving circuit that sequentially activates at least some pixels via the scan lines, and a driving controller that controls both circuits. The display panel includes a first display area with first pixels and a second display area with second pixels. The scan driving circuit activates both display areas at a first scan rate in a first operation mode and activates the second display area at a second scan rate in a second operation mode, where the second scan rate is lower than the first scan rate.