OLED Power Management Circuit for Burn-in Mitigation
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Solution Overview
Problem
OLED displays suffer from burn-in issues and increasing power consumption, especially when displaying high-brightness images, which affects display quality and user experience.
Innovation Solution
A power management circuit that outputs a direct-current voltage and an alternating-current voltage to an OLED pixel circuit, with adjustable levels based on a control signal, using switches and a capacitor to manage power consumption and reduce burn-in.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED displays operate at high brightness continuously, then display quality is improved, but power consumption increases and burn-in occurs
Solution Approach 1:
The patent applies periodic action by switching the OLED pixel between ON and OFF states in a time-division multiplexing manner. During the ON period, the pixel displays high brightness; during the OFF period, reverse voltage is applied to clear trapped charges. This periodic operation reduces average power consumption while preventing burn-in, resolving the contradiction between continuous high brightness operation and power consumption/burn-in prevention.
Solution Approach 2:
The patent changes the voltage parameter dynamically by applying different voltages during different time periods: forward voltage during ON period for high brightness display, and reverse voltage during OFF period for charge clearing. This parameter change enables the OLED to operate at high brightness when needed while consuming less average power and preventing burn-in accumulation.
2Illumination intensity
If OLED displays operate at high brightness continuously, then display quality is improved, but burn-in occurs
Solution Approach 1:
The patent applies preliminary anti-action by proactively applying reverse voltage during the OFF period to clear trapped charges before they can cause burn-in damage. This preventive measure counteracts the harmful effect of charge accumulation that would otherwise lead to burn-in, allowing the display to maintain high brightness without suffering from burn-in issues.
Solution Approach 2:
By implementing periodic switching between ON and OFF states with reverse voltage application during OFF periods, the patent prevents burn-in accumulation while maintaining high display brightness during ON periods. The periodic reverse voltage clears trapped charges before they can cause permanent damage, resolving the contradiction between high brightness operation and burn-in prevention.
3Manufacturing precision
If resolution increases, then display quality is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by time-division multiplexing the OLED pixels, switching them between ON and OFF states. During OFF periods, reverse voltage clears trapped charges. This reduces the average power consumption per pixel, which becomes significant when resolution increases and the total number of pixels increases, thereby resolving the contradiction between high resolution and power consumption.
Data Source
AI summary
A power management device including a power management circuit is provided. The power management circuit is configured to output a first power signal and a second power signal to a pixel circuit of a display panel. The pixel circuit includes an organic light-emitting diode. The organic light-emitting diode includes an anode terminal and a cathode terminal. The anode terminal is coupled to the first power signal. The cathode terminal is coupled to the second power signal. The second power signal is an alternating-current voltage. In addition, a pixel circuit of a display panel, and a power management method for the pixel circuit of the display panel are also provided.