Display Pixel Compensation Circuit for Under-Display Camera Uniformity
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Solution Overview
Problem
Existing OLED panels with under-display cameras face challenges in improving transmittance and reducing visibility of the normal region border while maintaining resolution and addressing uneven brightness issues.
Innovation Solution
A driver circuit with a controller circuit that performs image compensating operations using compensating values based on pixel location, utilizing lookup tables to determine weight values and adjust pixel values in image and non-image sensing regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the size or number of light emitting pixels is decreased to improve transmittance of the CUD region, then the transmittance is improved, but the resolution decreases and the normal region border becomes more visible
Solution Approach 1:
The patent applies local quality by implementing different compensating strategies for different regions of the display panel. The controller circuit identifies pixels located in the CUD region versus the normal display region, and applies region-specific compensation algorithms. For CUD region pixels, the system compensates for reduced light emission caused by the camera layer, while for normal region pixels, standard compensation is applied. This regional differentiation resolves the contradiction by maintaining high transmittance in the CUD region while preserving overall display resolution and uniformity.
2Illumination intensity
If the size or number of light emitting pixels is decreased to improve transmittance of the CUD region, then the transmittance is improved, but the visibility of the normal region border increases
Solution Approach 1:
The patent implements local quality by applying different compensation algorithms to different regions. For pixels at the boundary between CUD and normal regions, the system applies transitional compensation values that gradually adjust between the two region types. This prevents abrupt brightness transitions that would make the border visible, while still maintaining high transmittance in the CUD region.
Solution Approach 2:
The patent applies preliminary action by pre-calculating and storing compensation values for different pixel locations in lookup tables before display operation. The compensation values are determined in advance based on pixel location relative to the CUD region, allowing the controller circuit to quickly apply appropriate compensation without real-time calculation delays. This ensures smooth transitions across region boundaries and prevents border visibility issues.
3Illumination intensity
If the size or number of light emitting pixels is decreased to improve transmittance of the CUD region, then the transmittance is improved, but demura becomes more difficult
Solution Approach 1:
The patent simplifies demura by implementing local quality through region-specific compensation algorithms. Instead of applying a single complex demura algorithm to the entire display panel, the system divides the panel into CUD region pixels and normal region pixels, applying simplified compensation tailored to each region's characteristics. This reduces the overall complexity of the demura process while maintaining effective brightness uniformity.
Solution Approach 2:
The patent applies segmentation by dividing the display panel into distinct regions (CUD region and normal region) with different compensation requirements. The controller circuit segments the pixel array and applies different compensation strategies to each segment. This segmentation simplifies the demura process by breaking down the complex uniformity issue into manageable regional components, each with its own optimized compensation algorithm.
Data Source
AI summary
A driver circuit including a controller circuit is provided. The controller circuit is configured to perform an image compensating operation on a display pixel of an image sensing region of a display panel to compensate a pixel value of the display pixel using a first compensating value. The image sensing region is a circular area comprising image sensors. The controller circuit determines the first compensating value according to a location of the display pixel in the image sensing region. A method for compensating pixel values of display pixels is also provided.