AMOLED Driving Method Reducing Residual Image via Hierarchical Segmentation
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Solution Overview
Problem
AMOLED displays exhibit residual images due to uneven aging of drive transistors in high contrast static images, leading to noticeable image hierarchy and display quality issues.
Innovation Solution
A driving method that determines if an image is static, performs hierarchical segmentation, and adjusts pixel brightness using a proportional coefficient based on the segmentation results to reduce transistor aging and contrast differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform proportional coefficient is used to reduce drive voltage for eliminating residual images, then the residual image effect is reduced, but the image hierarchy becomes more obvious and display quality deteriorates
Solution Approach 1:
The patent applies different proportional coefficients to different regions of the image based on their brightness characteristics. High brightness regions use smaller coefficients to reduce transistor aging, while low brightness regions use larger coefficients to maintain visibility. This local differentiation resolves the contradiction by allowing region-specific optimization rather than uniform treatment.
Solution Approach 2:
The patent dynamically adjusts the proportional coefficient parameter based on the brightness value of each pixel or region. By changing this parameter adaptively according to local brightness conditions, the system achieves both residual image reduction and maintains image quality, avoiding the fixed coefficient limitation.
2Illumination intensity
If high brightness is applied to high contrast regions, then the display effect is improved, but the drive transistor aging accelerates and residual images occur
Solution Approach 1:
The patent applies a preventive measure by reducing the drive voltage in high brightness regions through smaller proportional coefficients before significant transistor aging occurs. This preliminary action counteracts the aging process proactively, preventing residual image formation while maintaining acceptable display quality.
Solution Approach 2:
The patent introduces dynamic adjustment of brightness levels based on transistor aging compensation. The proportional coefficients are adaptively selected based on image content and display duration, allowing the system to optimize between brightness and transistor protection in real-time rather than using fixed settings.
Data Source
AI summary
Disclosed are a driving method and a driving system for reducing a residual image of AMOLED display. The driving method includes steps of: determining whether an image to be displayed is a static image; performing hierarchical segmentation on the static image if a determination result is yes; regulating an output brightness proportional coefficient of each pixel based on a hierarchical segmentation result; and outputting brightness of each pixel according to a corresponding output brightness proportional coefficient. The driving method can significantly reduce generation of a residual image when a static image is displayed.