OLED Burn-In Compensation via Zone-Based Luminance Adjustment
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Solution Overview
Problem
OLED displays suffer from burn-in, a degradation in visible intensity over time, causing more-used pixels to appear darker than less-used pixels, which can lead to residual images and reduced pixel efficiency, and existing methods do not effectively compensate for this issue.
Innovation Solution
The method involves estimating burn-in factors for zones in an OLED display, determining a limiting burn-in factor, adjusting significantly different burn-in factors, updating these factors in memory, and controlling the driver IC to minimize burn-in effects by adjusting driving signals for pixels based on updated burn-in factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED pixels are driven continuously to maintain brightness, then initial luminance is achieved, but burn-in degradation occurs over time causing non-uniform display
Solution Approach 1:
The system performs preliminary characterization of each pixel's burn-in behavior during manufacturing or initial use, storing burn-in factors that predict future degradation. This preliminary action enables proactive compensation before visible burn-in occurs, maintaining display uniformity throughout the OLED's lifespan
Solution Approach 2:
The system dynamically adjusts driving parameters (current, voltage, or sub-frame timing) based on stored burn-in factors and measured luminance deviations. By changing these parameters in response to degradation, the system compensates for burn-in effects and maintains uniform luminance across all pixels
2Reliability
If burn-in compensation is applied to all pixels uniformly, then overall display uniformity improves, but pixels with different usage patterns cannot be compensated differently
Solution Approach 1:
The display is divided into multiple zones, and burn-in compensation is applied independently to each zone based on its specific degradation characteristics. This segmentation allows different compensation strategies for different areas of the display, improving overall uniformity while adapting to local variations in pixel usage and aging
Solution Approach 2:
Each pixel or zone is assigned individual burn-in factors that reflect its specific degradation behavior. This local quality approach enables tailored compensation for each region, allowing the system to address non-uniform aging patterns across different areas of the display rather than applying a single global correction
3Measurement precision
If burn-in factors are frequently updated to track degradation, then compensation accuracy improves, but computational overhead and processing time increase
Solution Approach 1:
Burn-in factor updates are performed periodically at predetermined intervals rather than continuously. This periodic action maintains sufficient compensation accuracy while significantly reducing computational overhead and processing time compared to continuous monitoring and adjustment
Solution Approach 2:
The system updates burn-in factors for only those pixels or zones that show significant degradation beyond a threshold, rather than recalculating all factors. This partial action approach maintains compensation accuracy for affected areas while minimizing unnecessary processing
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces the effects of burn-in across different pixel density areas of an OLED display, maintaining uniform luminance and minimizing residual images, thereby extending the display's lifespan and maintaining image quality over time.
Implementation Method 1
OLED displays include pixels that emit light when in response to an applied current. Each pixel may include an electroluminescent layer (e.g., organic thin film) disposed between an anode electrode and a cathode electrode.
Data Source
AI summary
A burn-in compensation method and a computing device configured for burn-in compensation is disclosed. The burn-in compensation can minimize or eliminate a burn-in of an OLED display having areas with different pixel densities. Each area of the OLED display may be divided into zones that include one or more pixels and a burn-in factor may be computed for the zones. A limiting burn-in factor may be determined from a limiting zone that exhibits the highest burn-in. Other zones with burn-in factors that area significantly different from the limiting burn-in factor can be adjusted so that the pixels in the adjusted zones can be driven to radiate similar light at a power similar to the liming zone. The burn-in compensation may be performed for each area and a transition region may be created between areas to minimize light artifacts after burn-in compensation.