Display Device Brightness Compensation for Mura Defect Pixels
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Solution Overview
Problem
Flat panel display devices often suffer from mura defects, which result in non-uniform brightness characteristics due to defect pixels with brightness deviations, and existing technologies lack effective methods for compensating these defects.
Innovation Solution
A display device and optical compensation system that detect defect pixels by analyzing brightness data to generate a brightness trend line, determining compensation parameters, and applying these parameters to adjust image data for defect pixels, thereby compensating for brightness deviations and preventing mura defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If brightness compensation is applied to all pixels, then uniformity of brightness is improved, but power consumption and processing load increase
Solution Approach 1:
The patent applies brightness compensation selectively only to detected defect pixels rather than all pixels. The display driving circuit identifies pixels with brightness deviations exceeding a threshold and applies compensation parameters exclusively to those localized regions, thereby maintaining brightness uniformity while minimizing unnecessary power consumption and processing overhead.
Solution Approach 2:
The patent implements partial compensation by targeting only the necessary subset of defect pixels. By detecting and compensating only for pixels that fall outside the acceptable brightness range (using threshold comparisons), the system avoids the excessive action of compensating all pixels, reducing overall power consumption while still achieving the desired uniformity where needed.
2Stability of the object's composition
If defect pixel detection and compensation is implemented, then mura defects are reduced, but device complexity increases
Solution Approach 1:
The patent segments the pixel array into normal pixels and defect pixels based on brightness threshold detection. By dividing the processing into distinct stages (detection, classification, selective compensation), the system manages complexity through modular functional blocks within the display driving circuit rather than requiring a completely complex redesign.
Solution Approach 2:
The display driving circuit performs self-diagnosis and self-compensation by detecting defect pixels and applying correction parameters autonomously. This self-service capability reduces the need for external compensation systems or complex additional hardware, as the existing circuitry is enhanced with detection and compensation functions that operate automatically.
3Measurement precision
If comprehensive brightness measurement and analysis is performed, then detection precision is improved, but processing time increases
Solution Approach 1:
The patent performs comprehensive brightness analysis only on pixels identified as potential defects through initial threshold-based detection. Rather than analyzing all pixels with full measurement precision, the system applies detailed brightness trend line analysis selectively to suspected defect regions, maintaining high detection accuracy while reducing overall processing time through this two-stage approach.
Data Source
AI summary
A display device, and an optical compensation system and an optical compensation method thereof. A display device including a display panel including pixels; and a display driving circuit for driving the display panel and including: a storage unit for storing defect pixel information indicating which of the pixels are detected as defect pixels based on a brightness trend line of the pixels, and for storing compensation parameters regarding the defect pixels; and a brightness compensation unit for converting image data corresponding to the defect pixels according to the defect pixel information and the compensation parameters.