OLED Degradation Compensation via Digital and Analog Voltage Adjustment
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Solution Overview
Problem
Organic light emitting diode (OLED) displays experience luminance degradation over time, leading to uneven deterioration between channels and devices, resulting in decreased image quality, color shift, and non-uniformity.
Innovation Solution
A degradation compensation device that includes a degradation rate acquisition unit estimating degradation rates using a stretched exponential decay model, a digital compensation unit lowering digital gradation based on maximum degradation rates, and an analog compensation unit increasing luminance by adjusting analog voltage supplied to the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OLED displays operate continuously, then productivity is improved, but luminance degradation occurs leading to decreased image quality
Solution Approach 1:
The patent applies preliminary action by performing degradation compensation before visible image quality deterioration occurs. The system continuously monitors pixel degradation rates and pre-adjusts driving currents to compensate for anticipated luminance decay, thereby maintaining image quality during continuous operation without waiting for actual degradation to manifest
Solution Approach 2:
The patent implements feedback mechanisms by measuring actual pixel luminance output, calculating degradation rates based on these measurements, and using this information to dynamically adjust driving currents. This closed-loop feedback system enables continuous operation while automatically correcting for degradation to maintain consistent image quality
2Reliability
If degradation compensation is performed for all pixels, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing pixel-level degradation compensation rather than uniform compensation across the entire display. Each pixel's degradation rate is calculated individually based on its specific luminance output and usage history, allowing targeted compensation that addresses local variations in degradation while simplifying the overall system compared to comprehensive pixel-level control
Solution Approach 2:
The patent utilizes parameter changes by adjusting driving current parameters dynamically based on measured degradation rates. The system modifies electrical parameters (current magnitude and timing) to compensate for degradation, providing an efficient software-based compensation mechanism that avoids complex hardware modifications while maintaining image quality
Data Source
AI summary
A degradation compensation device and an organic light emitting display device including the same are provided. The degradation compensation device includes a degradation rate acquisition unit acquiring estimated degradation rates, estimated with respect to a plurality of respective pixels, based on panel usage information, a digital compensation unit performing digital compensation to lower a digital gradation of each pixel, based on a luminance of a pixel having a maximum degradation rate, among the estimated degradation rates, and an analog compensation unit performing analog compensation to increase luminance of the plurality of pixels by changing an analog voltage supplied to a panel, after performing the digital compensation.