OLED Pixel Compensation via Regional Stress Data Compression
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Solution Overview
Problem
Organic light-emitting display devices experience deterioration in pixel brightness over time, leading to reduced luminescent efficiency and image quality degradation, with varying brightness reduction across pixels causing image sticking issues, necessitating effective compensation methods.
Innovation Solution
A display device and compensation method that utilize a timing controller to convert grayscale values into stress data, accumulate and compress data for each pixel, and determine compensation values through lossless and lossy compression techniques to address pixel deterioration and image sticking, using a data accumulator, average data processor, and deterioration and compensation value determiner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If lossless compression is applied to average data in regular region, then compensation precision is improved, but memory capacity is increased
Solution Approach 1:
The patent applies different compression methods to different regions: lossless compression for regular regions where precision is critical, and lossy compression for irregular regions where some precision loss is acceptable. This local differentiation resolves the contradiction by optimizing both precision and memory usage in their respective contexts.
Solution Approach 2:
The display panel is divided into regular regions and irregular regions, allowing independent compression strategies for each segment. This segmentation enables the system to maintain high compensation precision where needed while reducing overall memory capacity requirements through lossy compression in less critical areas.
2Measurement precision
If average data is accumulated for each pixel, then compensation accuracy is improved, but data processing complexity is increased
Solution Approach 1:
The patent transforms grayscale values into stress data representing pixel deterioration, changing the parameter representation to enable more efficient accumulation and compensation. This parameter transformation simplifies the processing of accumulated data while maintaining compensation accuracy.
Solution Approach 2:
The system pre-calculates and accumulates average stress data for each pixel over time, performing the compensation preparation in advance. This preliminary accumulation reduces real-time processing complexity while maintaining high compensation accuracy when needed.
3Reliability
If stress data is accumulated for each pixel, then image sticking compensation is improved, but storage requirement is increased
Solution Approach 1:
Different compression strategies are applied based on region characteristics: lossless compression for regular regions requiring high compensation reliability, and lossy compression for irregular regions where moderate reliability is sufficient. This resolves the contradiction between compensation reliability and storage requirements.
Solution Approach 2:
The patent accumulates stress data for accumulation periods shorter than the full OLED lifetime, providing sufficient compensation for practical usage without storing data for the entire device lifespan. This partial accumulation approach improves image sticking compensation while limiting storage requirements to practical needs.
Data Source
AI summary
Disclosed are a display device and a compensation method thereof for preventing and compensating for deterioration of pixels using average data of stress for each pixel. The display device includes a display panel comprising a plurality of pixels provided thereon and configured to display an image, a display driver configured to output a driving signal for driving the display panel, a timing controller configured to generate stress data by converting grayscale values included in image data into stress values, to accumulate the stress data for each pixel, to calculate average data for each pixel corresponding to an accumulated number of times, to determine a compensation value by performing lossless and lossy compression and restoration on the average data in a regular region and an irregular region, respectively, and to provide the compensation value to the display driver.