OLED Display Sub-Pixel Stress Dispersion via Color Combination Switching
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Solution Overview
Problem
Active matrix organic light emitting diode (OLED) displays experience pixel deterioration and afterimages due to uneven electrical characteristics of driving elements, leading to reduced lifespan and luminance, especially when displaying fixed patterns for extended periods.
Innovation Solution
A display device with a display panel comprising pixels made of three sub-pixels that change color combinations over time to disperse stress, using an image processing unit to render sub-pixel data in color combinations with low average current levels, and a sensing unit to detect pixel deterioration, thereby maintaining resolution and luminance without user recognition of pattern movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the screen is moved to prevent afterimage, then pixel stress is dispersed, but the bezel area appears enlarged and the screen movement is recognized by the user
Solution Approach 1:
The pixel is segmented into multiple sub-pixels (red, green, blue, yellow) that can be independently controlled. By selectively activating different sub-pixel combinations, the patent disperses stress at the sub-pixel level rather than moving the entire screen, thus preventing afterimages without affecting the displayed image position or bezel appearance.
Solution Approach 2:
Different sub-pixels within a pixel are assigned different functions and activation patterns. The patent applies local quality by making each sub-pixel independently controllable with different luminance characteristics, allowing stress dispersion while maintaining overall image quality and position.
2Reliability
If the screen is moved to prevent afterimage, then pixel stress is dispersed, but the screen movement is recognized by the user
Solution Approach 1:
The pixel is segmented into multiple sub-pixels (red, green, blue, yellow) that can be independently controlled. By selectively activating different sub-pixel combinations, the patent disperses stress at the sub-pixel level rather than moving the entire screen, thus preventing afterimages without affecting the displayed image position or bezel appearance.
Solution Approach 2:
The patent utilizes different color sub-pixels (red, green, blue, yellow) with different luminance characteristics to achieve stress dispersion. By changing which color sub-pixels are activated rather than moving the image, the patent prevents afterimages while maintaining image stability and avoiding user perception of movement.
3Illumination intensity
If fixed pattern is displayed for long time, then resolution and luminance are maintained, but pixel deterioration occurs due to long-time current flow
Solution Approach 1:
The patent implements periodic action by alternately activating different sub-pixel combinations over time. When displaying a fixed pattern, the system periodically switches between different sub-pixel sets (e.g., RGB vs. YGB combinations), ensuring that no single sub-pixel group experiences continuous stress, thus extending pixel lifespan while maintaining luminance.
Solution Approach 2:
The patent changes the activation parameters of sub-pixels over time. By dynamically adjusting which sub-pixels are active and their luminance levels, the system disperses cumulative stress while maintaining the perceived image quality and luminance, thereby preventing pixel deterioration.
4Duration of action of stationary object
If color combination is changed to disperse stress, then pixel lifespan is extended, but color accuracy may be affected
Solution Approach 1:
The patent implements periodic action by alternately activating different sub-pixel combinations over time. When displaying a fixed pattern, the system periodically switches between different sub-pixel sets (e.g., RGB vs. YGB combinations), ensuring that no single sub-pixel group experiences continuous stress, thus extending pixel lifespan while maintaining luminance.
Solution Approach 2:
The patent employs feedback mechanisms to monitor and adjust sub-pixel activation patterns. By continuously adapting the color combination based on stress accumulation and luminance requirements, the system maintains color accuracy while dispersing stress to extend pixel lifespan.
Data Source
AI summary
A display device and a driving method of the display device are disclosed. The display device includes a display panel including a plurality of pixels, wherein each of the pixels is composed of three sub-pixels among a first color sub-pixel, a second color sub-pixel, a third color sub-pixel, and a fourth color sub-pixel, an image processing unit configured to change a color combination on a time axis in at least one of the pixels, and render sub-pixel data of an input image in the color combination, and a display panel driving circuit configured to write data received from the image processing unit to the pixels.