Dynamic Image Shift Range for OLED Pixel Degradation
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Solution Overview
Problem
Display devices, such as OLEDs, face pixel degradation and image sticking issues when continuously showing specific images or characters, leading to burn-in and distortion, which existing compensation methods like regular image shifting fail to fully address.
Innovation Solution
A display device with an image shifter that adjusts the image shift range based on pixel age data and an image sticking compensator that calculates and applies grayscale compensation values to prevent pixel degradation, reducing the shift range and minimizing distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image shifting is performed continuously to prevent pixel degradation, then pixel stress is reduced, but image distortion increases
Solution Approach 1:
The patent applies dynamics by making the image shift range adjustable rather than fixed. The image shifter dynamically changes the shift range based on pixel age data, transitioning from larger shifts when pixels are younger to smaller shifts when pixels are older, thereby preventing degradation while minimizing distortion.
Solution Approach 2:
The patent changes the parameter of shift range based on pixel age. By monitoring age data and using threshold values to determine appropriate shift ranges, the system adapts the shifting behavior to match pixel condition, reducing distortion for older pixels while maintaining protection for younger ones.
2Device complexity
If fixed image shifting pattern is used, then implementation is simple, but image distortion occurs due to repeated patterns
Solution Approach 1:
The system transitions from a fixed shifting pattern to a dynamic one that adapts to pixel age. The image shifter receives age data and adjusts the shift range accordingly, creating a variable pattern that prevents the repetition-induced distortion while remaining implementable through standard processing units.
3Reliability
If larger image shift range is used, then pixel degradation is prevented more effectively, but image distortion increases
Solution Approach 1:
The patent changes the shift range parameter based on pixel age conditions. For pixels with lower age values, larger shift ranges are applied to maximize protection. For pixels with higher age values, smaller shift ranges are used to minimize distortion, optimizing both protection and visual quality.
Solution Approach 2:
The system applies different shift ranges to different regions based on their pixel age characteristics. By segmenting the display into regions with different age profiles and applying age-appropriate shift ranges to each, the system achieves localized optimization of both degradation prevention and distortion minimization.
Data Source
AI summary
A display device according to an exemplary embodiment includes a display panel that includes a plurality of pixels, and an image shifter that corrects an image corresponding to input image data to be shifted based on age data with respect to the plurality of pixels and an input grayscale of input image data and outputs corrected image data, wherein a shift range of the image is reduced when an age value of the age data exceeds a threshold value.