Degradation Compensation for OLED Regions with Varying Resolution
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Solution Overview
Problem
In organic light emitting diode displays, pixels in regions with different resolutions experience accelerated degradation due to varying luminance, leading to ineffective compensation and potential image sticking issues.
Innovation Solution
A degradation compensation device that uses separate degradation curves and lookup tables for pixels in regions with different resolutions, adjusting grayscale values based on accumulated usage time and light transmittance to compensate for luminance differences and accelerate degradation in lower resolution areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a relatively high current is provided to pixels in a relatively low resolution region to compensate for luminance difference, then the luminance uniformity is improved, but the degradation of pixels in the low resolution region is accelerated
Solution Approach 1:
The display panel is divided into multiple regions (first region and second region) with different resolutions. Each region is assigned its own degradation curve and lookup table, allowing independent degradation compensation strategies for each region, thus preventing uniform degradation compensation from accelerating degradation in low resolution regions
Solution Approach 2:
Different degradation compensation parameters are applied to different regions based on their specific characteristics. The first region uses a first degradation curve and first lookup table, while the second region uses a second degradation curve and second lookup table, tailoring the compensation to local needs and avoiding excessive compensation in low resolution regions
2Device complexity
If a single degradation curve is used for all pixels, then the device complexity is reduced, but the compensation accuracy for pixels in different resolution regions deteriorates
Solution Approach 1:
The degradation compensation system is segmented into multiple independent components: first degradation curve and first lookup table for the first region, and second degradation curve and second lookup table for the second region. This segmentation enables region-specific compensation accuracy without requiring a single overly complex universal system
Solution Approach 2:
Different parameters (degradation curves and lookup tables) are used for different regions based on their resolution characteristics. The system changes the compensation parameters according to the region type, allowing accurate compensation for each region while keeping each individual parameter set relatively simple
Data Source
AI summary
A display device includes a display unit, a degradation compensator and a data driver. The display unit includes first and second pixels disposed in first and second regions, respectively. The degradation compensator generates a first compensated grayscale value by compensating a first grayscale value for the first pixel based on a first degradation curve and generates a second compensated grayscale value by compensating a second grayscale value for the second pixel based on a second degradation curve, where the first and second degradation curves define luminance reduction rates according to accumulated usage time of the first and second pixels, respectively. A data driver generates first and second data signals based on the first and second compensated grayscale values, respectively, and supplies the first and second data signals to the first and second pixels, respectively. A transmittance of the second region is greater than a transmittance of the first region.