Anode Reset Voltage Control for Faster OLED Scene Changes
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Solution Overview
Problem
Display devices experience blurring due to slow gray response times of light emitting elements during scene changes, particularly when there is a large variation in luminance, leading to reduced display quality and increased power consumption.
Innovation Solution
A display device with a reset voltage control circuit that alters the anode reset voltage from a default level only at scene change times where the image gray level variation exceeds a reference value, thereby enhancing the gray response time and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the anode reset voltage is adjusted to increase gray response time at scene change times, then display quality is improved, but power consumption increases
Solution Approach 1:
The anode reset voltage is dynamically adjusted based on scene change detection. The reset voltage control circuit monitors image gray level variations and only applies enhanced reset voltage (different from default level) when scene changes are detected, allowing the system to adapt between normal and scene-change states
Solution Approach 2:
The reset voltage adjustment is applied periodically only at specific moments when scene changes occur, rather than continuously. The timing controller activates the reset voltage control circuit only during frame periods when gray level variation exceeds the reference value, creating periodic rather than continuous operation
2Reliability
If the anode reset voltage is continuously adjusted to maintain fast gray response, then display quality is improved, but power consumption increases
Solution Approach 1:
The system dynamically switches between normal reset voltage and enhanced reset voltage based on scene change conditions. The reset voltage control circuit is activated only when the timing controller detects that image gray level variation exceeds the reference value, creating a dynamic response to actual display needs
Solution Approach 2:
The enhanced reset voltage is applied locally only to pixels in the active area where scene changes are detected, rather than uniformly across the entire display. The timing controller identifies specific regions experiencing scene changes and targets reset voltage adjustment to those areas
Data Source
AI summary
A display device includes a display panel including an active area configured with a plurality of pixels, a source driver configured to divide gamma reference voltages to generate a data voltage for implementing an image gray level and supply the data voltage to the pixels of the active area, and a reset voltage control circuit configured to change an anode reset voltage for discharging light emitting elements of the plurality of pixels to be different from a default level, at a scene change time where the amount of image gray variation is a reference value or more with respect to at least a partial region of the active area, and supply the anode reset voltage to pixels of the at least partial region of the active area.