Display Grayscale Compensation for OLED Degradation Drift
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Solution Overview
Problem
Display devices experience degradation over time, requiring increased driving current to maintain luminance, and existing technologies fail to accurately compensate for process variations and deviations among display panels.
Innovation Solution
A display device with a degradation compensator that determines compensation values based on cumulative usage time and degradation values, adjusting the compensation gain according to the dynamic range, emission efficiency, and emission surface area of the light emitting element to maintain accurate luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the driving current is increased to maintain luminance, then the luminance is maintained, but the light emitting element degrades faster
Solution Approach 1:
The system performs preliminary compensation by calculating and applying degradation compensation values before the luminance drift becomes noticeable. The degradation compensator continuously monitors cumulative usage time and applies pre-calculated compensation gains to maintain luminance without requiring excessive driving current, thus preventing accelerated degradation.
Solution Approach 2:
The system dynamically changes the compensation gain parameter based on cumulative usage time. As the light emitting element ages, the degradation compensator adjusts the compensation gain to account for degradation, allowing the driving current to remain optimized while maintaining luminance. This parameter adjustment prevents both over-compensation (which would waste energy) and under-compensation (which would allow luminance drift).
2Device complexity
If a simple degradation compensation method is used, then the device complexity is low, but the compensation accuracy is insufficient
Solution Approach 1:
The system implements feedback by continuously monitoring cumulative usage time and adjusting compensation based on actual degradation patterns. The degradation compensator uses feedback from usage data to refine compensation accuracy over time, ensuring that compensation remains accurate without requiring complex real-time measurement systems.
Solution Approach 2:
The system performs preliminary compensation calculations based on cumulative usage time before actual luminance drift occurs. By pre-calculating compensation values and storing them in lookup tables or applying them through predetermined algorithms, the system achieves high compensation accuracy without requiring complex real-time analysis, thus keeping device complexity manageable.
Data Source
AI summary
A display device includes: a pixel including a light emitting element; and a degradation compensator to determine a compensation value for an input grayscale value of the pixel, based on the input grayscale value and at least one of a cumulative usage time or a cumulative degradation value of the light emitting element. The degradation compensator is to determine a compensation gain, based on a dynamic range of a driving transistor of the pixel and at least one of the cumulative usage time or the cumulative degradation value. The degradation compensator is to determine an output grayscale value of the pixel, based on the compensation value and the compensation gain.