Image Sticking Compensation in OLED Displays via Regional Degradation Analysis
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Solution Overview
Problem
Existing display devices, particularly organic light-emitting display devices, suffer from image sticking (or mura) due to burn-in of organic light-emitting diodes, and current compensation methods are not effective across different devices due to varying driving environments and panel distributions.
Innovation Solution
A method for compensating image sticking in display devices that involves storing image-sticking compensation data, performing a compensation operation on test data, displaying a test image, and receiving user inputs to identify miscompensation regions. Based on these inputs, an additional compensation value is determined for each pixel in the miscompensation region to adjust the gray level and improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same image-sticking compensation data is applied to different display devices, then the compensation process is simple and efficient, but image sticking may be overcompensated or undercompensated in at least a portion of the display devices due to varying driving environments and panel distributions
Solution Approach 1:
The patent divides the display panel into multiple regions (first region, second region, third region) with different degradation characteristics. Each region has its own degradation amount calculation and compensation value determination, allowing localized compensation strategies that account for spatial variations in pixel degradation patterns across the display panel.
Solution Approach 2:
The patent implements a dynamic compensation approach where compensation values are not fixed but are determined based on real-time degradation amounts calculated from current image data and region-specific characteristics. The system continuously adapts compensation parameters according to the actual degradation state of each pixel and region, making the compensation process responsive to changing conditions.
2Ease of operation
If image-sticking compensation is performed using fixed compensation data, then the compensation method is simple to implement, but it cannot adapt to variations in driving environment such as temperature and ambient light
Solution Approach 1:
The patent pre-divides the display panel into multiple regions with different degradation characteristics before actual image display. This preliminary regional classification allows the system to prepare region-specific compensation strategies in advance, so when image sticking occurs, the appropriate compensation can be quickly applied without complex real-time analysis of environmental conditions.
Solution Approach 2:
The patent changes compensation parameters (compensation values) based on degradation amounts that vary by region and pixel location. By adjusting compensation parameters according to the specific degradation state of each region rather than using fixed values, the system adapts to varying driving conditions while maintaining a relatively simple implementation framework.
3Device complexity
If uniform compensation is applied to all pixels, then the compensation process is straightforward, but it fails to account for different degradation amounts in different regions of the display panel
Solution Approach 1:
The patent segments the display panel into multiple distinct regions (first region, second region, third region) based on degradation characteristics. Each segment is treated independently with its own degradation calculation and compensation application, allowing the system to handle spatial variations in pixel degradation while maintaining a structured and manageable compensation framework.
Solution Approach 2:
The patent applies different compensation values to different regions based on their specific degradation amounts. Each pixel's compensation is determined by its location-specific degradation characteristics rather than applying a uniform compensation value across the entire panel, achieving precise localized compensation while keeping the overall system relatively simple through region-based classification.
Data Source
AI summary
A method of compensating image sticking in a display device includes storing image-sticking compensation data representing a compensation value according to a degradation amount of a pixel, performing an image-sticking compensation operation on test data based on the image-sticking compensation data, displaying a test image based on the test data, receiving a miscompensation region input representing a miscompensation region in the test image, receiving a relative brightness input representing whether the miscompensation region is brighter or darker than a remaining region of the test image that is other than the miscompensation region, and determining an additional compensation value for the pixel in the miscompensation region based on the degradation amount of the pixel in the miscompensation region, based on the miscompensation region input, and based on the relative brightness input.