OLED Pixel Grouping for Brightness Deviation Compensation
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Solution Overview
Problem
Existing display devices with organic light emitting diodes (OLEDs) face brightness deviations due to pixel deterioration over time, leading to image quality degradation, as current compensation methods rely on lifespan model formulas that do not accurately account for individual pixel characteristics.
Innovation Solution
A display device and driving method that group pixels into deterioration and reference groups, sense current flow through OLEDs, and adjust compensation data using a compensation prediction curve to accurately correct for brightness deviations, ensuring precise compensation for each pixel group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a lifespan model formula is used to compensate for pixel deterioration, then compensation can be performed, but the compensation accuracy deteriorates when panel or pixel characteristics differ from the general model
Solution Approach 1:
The patent divides pixels into multiple groups (first pixel group, second pixel group, third pixel group) based on their deterioration characteristics. Each group is compensated using separate prediction curves tailored to their specific aging patterns, rather than using a single universal model for all pixels. This segmentation enables accurate compensation for pixels with different characteristics while maintaining system simplicity.
2Reliability
If individual pixel compensation is performed using general lifespan model, then compensation can be applied, but brightness deviation between pixels increases due to model inaccuracy
Solution Approach 1:
The patent applies different compensation strategies to different pixel groups based on their local deterioration characteristics. Each pixel group receives customized prediction curves that match its specific aging behavior, ensuring that compensation values are locally optimized for accuracy while maintaining overall brightness uniformity across the display panel.
3Device complexity
If compensation is performed without grouping pixels, then the process is simple, but brightness bruising occurs due to uneven compensation
Solution Approach 1:
The patent segments pixels into distinct groups (first, second, and third pixel groups) with different deterioration characteristics. By applying separate prediction curves to each group, the system achieves uniform compensation across all pixels, eliminating brightness bruising while maintaining relatively simple processing through structured grouping.
Data Source
AI summary
Exemplary embodiments of the present invention disclose a display device, and a method of driving the same. The display device includes a display unit including pixels included in one or more deterioration region groups and pixels included in one or more reference groups corresponding to the deterioration region groups, a sensing unit configured to sense a current flowing through an organic light emitting diode of each of the deterioration region groups and each of the reference groups and provide current information about the deterioration region group and current information about the reference group. Exemplary embodiments of the present invention also provide a compensation circuit configured to convert first data supplied from the outside into second data by using compensation data corresponding to a compensation prediction curve and output the second data, and compare the current information about the deterioration region group and the current information about the reference group and correct the compensation prediction curve for the deterioration region group; and a data driver configured to supply the second data to the display unit through data lines as data signals.