OLED Degradation Compensation via Edge-Based Gain Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing organic light emitting displays face issues with luminance uniformity due to varying degradation speeds of organic light emitting diodes (OLEDs), leading to accelerated degradation and reduced lifespan, as they compensate for luminance by increasing current to degraded areas, which exacerbates the degradation problem.
Innovation Solution
An organic light emitting display system that identifies excessively degraded areas and applies a compensation gain to compensation blocks based on edge information from input images, reducing the compensation luminance and slowing down the degradation process by differentially calculating compensation gains within a range less than '1' for complex and flat images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If current is increased to compensate for luminance degradation in degraded areas, then luminance uniformity is improved, but degradation speed is accelerated and lifespan is reduced
Solution Approach 1:
The patent applies different compensation gains to different image regions based on their complexity. For complex regions (edges, textures), a lower compensation gain is used, while for flat regions, a higher compensation gain is used. This local differentiation allows luminance compensation without uniformly increasing current across all areas, thereby reducing accelerated degradation while maintaining perceived luminance uniformity.
Solution Approach 2:
The compensation gain is dynamically adjusted based on image complexity analysis. The system analyzes edge information and texture density to determine the appropriate compensation level for each region, making the compensation adaptive rather than static. This dynamic approach prevents excessive current application to already degraded areas while maintaining image quality.
2Illumination intensity
If uniform luminance compensation is applied across the entire display, then image quality is maintained, but stress on degraded areas increases and degradation accelerates
Solution Approach 1:
The patent implements local quality by analyzing image complexity at different spatial locations and applying region-specific compensation gains. Complex regions with edges and textures receive lower compensation gains, while flat regions receive higher gains. This localized approach maintains overall display luminance while reducing stress concentration on degraded areas.
Solution Approach 2:
The system changes the compensation parameter (gain value) based on local image characteristics. By calculating edge information density and texture complexity, the system dynamically adjusts the compensation gain parameter for each region, transforming a uniform compensation approach into a spatially varying compensation strategy that reduces degradation stress.
3Illumination intensity
If compensation gain is increased to counteract degradation, then luminance is restored, but current consumption increases and degradation is accelerated
Solution Approach 1:
The patent applies partial compensation rather than full compensation across the entire display. By analyzing image complexity, the system determines that full compensation is unnecessary for complex regions where edge information provides natural luminance variation. This partial action approach reduces overall current consumption while maintaining acceptable image quality.
Solution Approach 2:
Different compensation levels are applied to different regions based on their visual importance and complexity. Flat regions receive higher compensation gains, while complex regions with natural luminance variation receive lower gains. This local differentiation reduces total current consumption while maintaining perceived image quality.
Data Source
AI summary
An organic light emitting display includes a display panel including a plurality of pixels, a compensation area setting unit for selecting an additional compensation requirement area, that is more excessively degraded than an average degradation, based on degradation detection data indicating a degradation degree of organic light emitting diodes formed in the pixels, an edge information extraction unit that analyzes input image data corresponding to the additional compensation requirement area and obtains edge information of an input image, a compensation gain calculation unit for differentially calculating a compensation gain to be applied to compensation data in each of the compensation blocks belonging to the additional compensation requirement area based upon an amount of edge information; and a data modulation unit producing modulation image data to be displayed on the display panel.