Abnormal Pixel Brightness Compensation Using Adjacent Normal Pixels
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Solution Overview
Problem
Display devices often suffer from uneven brightness due to abnormal pixels, which result in defective spots and a poor user experience, necessitating an effective method to compensate for brightness uniformity.
Innovation Solution
A method that enhances the brightness of adjacent normal pixels with the same color as the abnormal pixel by generating an updated image signal with an escalated grey level, using a weight ratio to adjust the original grey level, ensuring the sum of weight ratios falls within specific ranges to effectively compensate for the abnormal pixel's brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness of abnormal pixels is directly compensated by increasing the brightness of adjacent normal pixels, then brightness uniformity is improved, but the risk of over-compensation and loss of image detail increases
Solution Approach 1:
The patent applies local quality by differentiating compensation strategies based on the spatial relationship between abnormal and normal pixels. Adjacent normal pixels receive different weight ratios depending on their distance from the abnormal pixel, with closer pixels receiving higher weights. This localized differentiation allows precise control over compensation intensity, improving brightness uniformity while preserving image details through gradient-based weight distribution.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the weight ratio parameter based on multiple factors including the grey level of the abnormal pixel, the position relationship between pixels, and the specific compensation needs. The weight ratio serves as a controllable parameter that balances compensation intensity against image detail preservation, allowing the system to adapt to different abnormal pixel scenarios and maintain optimal brightness uniformity without excessive detail loss.
2Device complexity
If a simple brightness enhancement method is used for abnormal pixels, then the device complexity is reduced, but the effectiveness of brightness compensation deteriorates
Solution Approach 1:
The patent implements self-service by enabling the display device to automatically detect abnormal pixels and perform compensation without external intervention. The system autonomously identifies abnormal pixels, calculates appropriate weight ratios based on their characteristics and positions, and applies compensation through image signal processing. This self-service mechanism maintains low device complexity while ensuring reliable brightness compensation through automated multi-factor analysis and adaptive parameter adjustment.
3Illumination intensity
If the weight ratio for brightness enhancement is increased to improve compensation effectiveness, then brightness uniformity is improved, but the likelihood of over-compensation and image distortion increases
Solution Approach 1:
The patent applies dynamics by making the weight ratio a dynamic parameter that automatically adjusts based on real-time conditions including the abnormal pixel's grey level, its position relative to normal pixels, and the specific compensation requirements. This dynamic adjustment mechanism ensures optimal compensation effectiveness while preventing over-compensation, as the weight ratio adapts to each scenario rather than using fixed values, thereby maintaining good image quality control across varying conditions.
Data Source
AI summary
A method for compensating for a brightness of an abnormal pixel of a display device is provided. The display device includes a plurality of normal pixels. The method includes: enhancing a brightness of at least one of the normal pixels to compensate for the brightness of the abnormal pixel. The at least one of the normal pixels has a same color as the abnormal pixel, and is adjacent to the abnormal pixel.