Data Compensator for OLED Image Sticking via Pixel Degradation Interpolation
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Solution Overview
Problem
Organic light emitting displays experience image sticking due to degradation of pixel circuits, leading to display quality degradation, particularly with continuously displayed logos, as the mobility of driving transistors degrades over time.
Innovation Solution
A data compensator is introduced, which includes a block compensation coefficient generator, gamma applier, compensation margin generator, block compensation coefficient storage, pixel compensation coefficient generator, and multiplier to calculate and apply compensation coefficients and gamma curves to pixel data, addressing pixel degradation by interpolating and scaling block compensation coefficients based on pixel coordinates and degradation levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If continuous high luminance display is used for logos, then brand visibility is improved, but pixel circuit degradation accelerates leading to image sticking
Solution Approach 1:
The system performs preliminary measurement of pixel characteristics during a calibration phase and stores this data in lookup tables. These pre-measured values are then used to compensate for degradation during normal operation, preventing image sticking before it occurs.
Solution Approach 2:
The system continuously monitors display output and compares it against expected values. When degradation is detected through feedback loops, the system adjusts compensation parameters dynamically to maintain display quality and prevent image sticking.
2Manufacturing precision
If compensation parameters are updated frequently, then display quality is maintained, but processing time increases reducing productivity
Solution Approach 1:
Compensation parameters are pre-calculated and stored in lookup tables during an initial calibration phase. During normal operation, the system simply retrieves pre-computed values from these tables rather than performing complex real-time calculations, significantly reducing processing time while maintaining display quality.
Solution Approach 2:
The system dynamically selects different compensation strategies based on display conditions. For stable content like logos, it uses pre-computed lookup table values. For changing content, it applies real-time adjustments only when necessary, optimizing the balance between quality and speed.
Data Source
AI summary
A data compensator includes first logic, second logic, third logic, fourth logic, and fifth logic. The first logic calculates block compensation coefficients for blocks in a first frame based on first pixel data of the first frame. The second logic generates first gamma applied pixel data based on the first pixel data of the first frame and to generate second gamma applied pixel data based on the first gamma applied pixel data and second pixel data of a second frame adjacent the first frame. The third logic selects a number of the block compensation coefficients based on a pixel coordinate. The fourth logic generates a pixel compensation coefficient corresponding to the second pixel data by interpolating the selected block compensation coefficients based on the pixel coordinate. The fifth logic generates output pixel data based on the second gamma applied pixel data and the pixel compensation coefficient.