Pixel Degradation Compensation Using Dual Coefficients
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Solution Overview
Problem
Display devices experience degradation in luminance and display quality over time due to the degradation of light emitting elements, especially in pixels with defects such as short-circuit defects.
Innovation Solution
A display device and method that include a display panel with pixels having multiple stages of light emitting elements, a storage component to store location information of defective pixels, and a compensation component that generates data to compensate for grayscale values based on different degradation coefficients for normal and defective pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single degradation coefficient is used for all pixels, then the device complexity is reduced, but the display quality and luminance uniformity deteriorate due to defective pixels
Solution Approach 1:
The patent applies local quality by using different degradation coefficients for different pixel types. Normal pixels use a first degradation coefficient while defective pixels use a second degradation coefficient. This allows the compensation to be tailored to the specific condition of each pixel, improving display quality without requiring overly complex universal compensation mechanisms.
Solution Approach 2:
The patent changes the degradation coefficient parameter based on pixel defect status. By detecting defective pixels and assigning them a different degradation coefficient (second coefficient) compared to normal pixels (first coefficient), the system adapts the compensation parameters to match the actual degradation characteristics of each pixel type, thereby maintaining high display quality.
2Manufacturing precision
If different degradation coefficients are used for normal and defective pixels, then the display quality is improved, but the device complexity increases
Solution Approach 1:
The patent segments the pixel population into two distinct groups: normal pixels and defective pixels. Each segment is assigned a specific degradation coefficient (first coefficient for normal pixels, second coefficient for defective pixels). This segmentation allows the compensation mechanism to handle each group appropriately without requiring a completely different approach for each pixel, thus managing complexity while improving quality.
Solution Approach 2:
The system performs self-service by automatically detecting defective pixels and assigning appropriate degradation coefficients without requiring manual intervention. The compensation component identifies which pixels are defective and applies the correct coefficient automatically, reducing the operational complexity while maintaining high display quality through precise compensation.
3Device complexity
If defective pixels are not compensated, then the device complexity is reduced, but the luminance uniformity and display quality deteriorate
Solution Approach 1:
The patent addresses luminance uniformity by applying local quality compensation to defective pixels. By detecting which pixels are defective and applying a specific second degradation coefficient to them, the system ensures that these pixels receive appropriate compensation tailored to their degraded state, thereby maintaining overall luminance uniformity across the display without requiring uniform compensation for all pixels.
Data Source
AI summary
A display device may include a plurality of pixels. Each of the plurality of pixels may include a plurality of stages electrically connected in series. Each of the plurality of stages may include a plurality of light emitting elements. A storage component may store location information of a defective pixel having a defect in the plurality of stages. A compensation component may generate compensated data by compensating for a grayscale value in image data of a normal pixel based on a first degradation coefficient, and by compensating for a grayscale value of the defective pixel corresponding to the location information based on a second degradation coefficient different from the first degradation coefficient, and thus generate compensated data. A data driver may generate data voltages based on the compensated data, and provide the data voltages to the plurality of pixels.