Display Device Power Supply Voltage Variation for Flicker Reduction
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Solution Overview
Problem
Display devices with low refresh rates experience flicker phenomena due to decreased brightness over time, affecting user perception and display quality.
Innovation Solution
A display device with a power supply system that varies the power source voltage between different voltage levels for different scan lines, maintaining a constant change rate of driving current to mitigate brightness changes and prevent flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device operates at a low refresh rate to reduce power consumption, then power consumption is reduced, but brightness decreases over time and flicker phenomenon occurs
Solution Approach 1:
The power supply voltage is varied periodically between a first voltage level and a second voltage level during the display of a single frame image. This periodic voltage variation causes periodic changes in pixel brightness that synchronize with the scan signal timing, preventing visible flicker while maintaining low refresh rate operation and reduced power consumption.
Solution Approach 2:
The power supply dynamically adjusts the voltage level provided to pixels during the display period. Instead of maintaining a constant voltage, the system transitions between different voltage levels (first voltage level for some scan lines, second voltage level for others) based on the scan signal timing, thereby dynamically controlling brightness to eliminate flicker perception.
2Illumination intensity
If the power source voltage is varied between different voltage levels for different scan lines, then brightness changes are minimized and flicker is prevented, but device complexity increases
Solution Approach 1:
The display panel is divided into multiple display areas corresponding to different scan line groups. Each display area receives a different voltage level (first or second voltage level) from the power supply. This segmentation allows the system to manage complexity by organizing the voltage variation pattern according to the scan signal structure, making the control more systematic and less complex.
Solution Approach 2:
The power supply unit performs multiple functions: it provides different voltage levels to different display areas, synchronizes with the scan driver timing, and eliminates flicker all through a single integrated control mechanism. The scan signal timing information is reused to control both the scanning operation and the power supply voltage switching, reducing the need for separate control circuits.
Data Source
AI summary
A display device includes a display unit. The display unit includes a first display area and a second display area. A first scan line, a first power line, and first pixels connected to the first scan line and the first power line are in the first display area. A second scan line, a second power line, and second pixels connected to the second scan line and the second power line are in the second display area. A scan driver is configured to sequentially provide a scan signal to the first scan line and the second scan line. A power supply is configured to provide a power source voltage that is varied independently to the first power line and the second power line.