OLED Pixel Deterioration Compensation via Dynamic Gamma Adjustment
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Solution Overview
Problem
Organic light emitting displays (OLEDs) deteriorate over time, leading to changes in threshold voltage, luminous efficacy, and resulting in afterimages and non-uniform luminance, which reduces the lifespan of display devices.
Innovation Solution
A display device and method that includes a deterioration compensation device to generate compensated image data by adjusting input image data based on accumulated deterioration data of pixels, using gamma values that change according to the degree of deterioration of each pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fixed gamma values are used for compensation, then the device complexity is reduced, but the manufacturing precision of compensation data deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting gamma values based on accumulated deterioration data. Instead of using fixed gamma values, the system changes the gamma parameter according to the deterioration level of each pixel, thereby improving compensation accuracy while managing complexity through algorithmic adaptation.
Solution Approach 2:
The patent implements dynamics by transitioning from static gamma values to dynamic gamma values that adapt over time. The gamma values are updated based on accumulated deterioration data, allowing the compensation system to evolve and improve accuracy as the display ages, rather than relying on predetermined fixed values.
2Manufacturing precision
If pixel-specific gamma values are used, then the manufacturing precision of compensation data is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the compensation process into pixel-level operations. Each pixel receives individualized compensation based on its specific deterioration characteristics, allowing precise targeted correction rather than blanket compensation, thereby improving accuracy while managing complexity through modular processing.
Solution Approach 2:
The patent implements local quality by applying different gamma values to different pixels based on their individual deterioration levels. This localized approach ensures that each pixel is compensated according to its specific needs, improving overall compensation accuracy while allowing the system to focus computational resources where they are most needed.
3Reliability
If dynamic gamma adjustment is implemented, then the reliability of display performance over time is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent applies self-service by enabling the display system to automatically adjust gamma values based on its own accumulated deterioration data. The system monitors its own performance degradation and autonomously compensates without requiring external intervention or manual calibration, thereby improving reliability while maintaining ease of operation through automated self-adjustment.
Solution Approach 2:
The patent implements feedback by using accumulated deterioration data to continuously adjust gamma values. The system monitors performance changes over time and uses this feedback to optimize compensation parameters, ensuring consistent display reliability while automating the adjustment process to maintain ease of operation.
Data Source
AI summary
A display device according to an embodiment of the present disclosure includes a display panel including a plurality of pixels, a data driver configured to generate an image data voltage based on compensated image data generated by compensating for input image data and to apply the generated image data voltage to the display panel, and a deterioration compensation device configured to generate compensated image data by compensating for the input image data in response to an accumulated amount of deterioration data of the pixels and to apply the compensated image data to the data driver, wherein the deterioration compensation device compensates for the input image data on the basis of gamma values changed according to degrees of deterioration of the pixels.