OLED Degradation Compensation Circuit for Luminous Uniformity
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Solution Overview
Problem
OLED display panels experience decreased image quality due to degradation of electrical characteristics in driving transistors, leading to inefficiencies in degradation modeling and characteristic sensing methods, which either underestimate or overestimate degradation, affecting luminous uniformity and image quality.
Innovation Solution
A display driving circuit with a data driver and degradation compensation circuit that accumulates and corrects degradation values for pixel blocks, using a degradation model to compensate for pixel degradation, allowing for improved data compensation without real-time characteristic sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If degradation model method is used to estimate pixel degradation, then productivity is improved by avoiding real-time sensing, but measurement precision deteriorates as degradation values are underestimated
Solution Approach 1:
The patent performs degradation modeling in advance based on driving history data before actual display operation. The degradation values for different gray levels are pre-calculated and stored in a lookup table, allowing the display device to compensate for pixel degradation without real-time sensing during operation. This preliminary action resolves the contradiction by achieving both efficient data compensation and improved degradation estimation accuracy through iterative refinement of the degradation model.
Solution Approach 2:
The patent implements a feedback mechanism where actual display data is compared with compensated display data, and the difference is used to update and refine the degradation model. The degradation values are iteratively adjusted based on the correlation between original and compensated images, improving measurement precision while maintaining productivity through efficient computational feedback loops.
2Measurement precision
If characteristic sensing method is used to calculate degradation based on electrical characteristics, then measurement precision is improved, but device complexity increases due to real-time sensing requirements
Solution Approach 1:
The patent extracts only the essential degradation information from complex electrical characteristic sensing by using pre-established degradation models based on driving history. Instead of implementing full real-time electrical characteristic sensing, the system extracts degradation values from stored driving data and gray level information, significantly reducing device complexity while maintaining adequate measurement precision through model-based estimation.
Solution Approach 2:
The patent creates a simplified computational model that copies the essential degradation behavior observed from electrical characteristics without implementing the full sensing hardware. The degradation model replicates the degradation patterns based on driving history and gray level data, providing accurate enough measurements while avoiding the complexity of real-time electrical characteristic sensing systems.
3Device complexity
If degradation values are not corrected for different gray levels, then device complexity is reduced, but manufacturing precision deteriorates as luminous uniformity decreases
Solution Approach 1:
The patent segments the degradation compensation into different gray level categories, creating separate degradation values for each gray level (e.g., first gray level, second gray level, third gray level). This segmentation allows the system to account for the fact that different gray levels experience different degradation rates, improving luminous uniformity while maintaining manageable device complexity through structured organization of degradation data.
Solution Approach 2:
The patent applies local quality by assigning different degradation compensation values to different gray levels based on their specific degradation characteristics. Each gray level receives tailored compensation rather than a uniform approach, improving manufacturing precision and luminous uniformity. The degradation model stores and applies gray-level-specific degradation values to achieve localized optimization of display quality.
Data Source
AI summary
A display driving circuit including: a data driver configured to supply driving signals to a plurality of pixels of a display panel and sense electrical characteristics of each of the plurality of pixels; and a degradation compensation circuit configured to generate and store an accumulated degradation value by, accumulating degradation values for each of a plurality of pixel blocks for a unit time, based on driving data corresponding to the driving signals, correct the accumulated degradation value of a first pixel block, based on sensing data received from the data driver, and perform data compensation to compensate for pixel degradation, based on the accumulated degradation values and a degradation model, wherein each pixel block includes at least one pixel.