OLED Driving Time Difference Optimization for Afterimage and Brightness
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Solution Overview
Problem
Organic light emitting diode (OLED) display panels face issues with threshold voltage shift and mobility variation, leading to afterimages, which necessitate a method to balance brightness and afterimage problems effectively.
Innovation Solution
A method and device for determining a driving time difference by testing candidate time differences based on the highest brightness threshold of sub-pixels, using a test picture to evaluate picture display quality through brightness uniformity, highest brightness, afterimage level, and mura, to optimize the driving time difference for improved display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a driving time difference is applied to sub-pixels, then afterimage problems are reduced, but brightness uniformity deteriorates
Solution Approach 1:
The patent applies parameter changes by systematically varying the driving time difference parameter across different sub-pixels. By adjusting the turn-off timing of the second switch relative to the first switch, the patent optimizes the balance between afterimage reduction and brightness uniformity. Different time differences (e.g., 0.5ms, 1ms, 1.5ms) are tested to find the optimal parameter setting that resolves the contradiction.
2Reliability
If the second switch is turned off earlier than the first switch, then threshold voltage shift compensation is improved, but picture display quality deteriorates
Solution Approach 1:
The patent implements preliminary action by turning off the second switch before the first switch during the data writing period. This early turn-off action compensates for threshold voltage shift and mobility variation in the driving element before the data writing completes, thereby improving reliability while managing picture display quality through controlled timing.
3Device complexity
If a fixed driving time difference is used, then circuit operation is simplified, but adaptability to different brightness requirements deteriorates
Solution Approach 1:
The patent applies dynamics by making the driving time difference adjustable rather than fixed. The system can dynamically select different time difference values (first, second, third time differences) based on brightness thresholds and display conditions, enhancing adaptability while maintaining manageable circuit complexity through a systematic selection method.
Data Source
AI summary
The present disclosure provides a method and a device for driving a display panel. The method of the present disclosure includes: determining a plurality of candidate time differences according to a highest brightness threshold of the sub-pixels of each color; for each candidate time difference, displaying, by the display panel, a same test picture using the candidate time difference, and detecting picture display quality of the display panel when the test picture is displayed by the display panel using the candidate time difference; and determining a candidate time difference corresponding to an optimal picture display quality as the time difference.