Display Dithering Control for Low-Light Noise Reduction
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Solution Overview
Problem
Display devices experience image quality deterioration due to insufficient grayscale representation in low-grayscale regions, leading to noise and false contours, particularly in dark environments where the luminance difference between pixels is significant.
Innovation Solution
A display device and method that incorporates a ditherer, an illumination sensor, and a processor to control dithering based on the grayscale level of video data, where dithering is adjusted or disabled when the illumination is low, using a stored table to match grayscale levels with corresponding dithering values to minimize noise in low-grayscale regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dithering is performed to increase the number of grayscales in low-grayscale regions, then grayscale representation is improved, but luminance difference between surrounding pixels increases causing noise
Solution Approach 1:
The patent dynamically adjusts the dithering strength parameter based on the grayscale level of the image content. By changing the dithering parameter according to the local grayscale value, the system achieves better grayscale representation in dark regions while minimizing noise generation, as lower dithering strength is applied where luminance differences are more perceptible
Solution Approach 2:
The patent implements dynamic control of the dithering process by adjusting dithering parameters in real-time based on the grayscale level of each pixel or region. This dynamic adaptation allows the system to optimize between grayscale representation and noise reduction depending on the local image characteristics, rather than applying a fixed dithering approach
2Loss of information
If dithering is applied in low-grayscale regions, then insufficient color information is expressed through density combination, but luminance difference between pixels becomes greater causing visible noise in dark places
Solution Approach 1:
The system changes the dithering parameter based on the grayscale level, applying weaker dithering in low-grayscale regions where luminance differences are more noticeable. This parameter adaptation allows color information to be preserved through dithering while minimizing the visibility of noise in dark regions
Solution Approach 2:
The patent applies different dithering strengths to different regions of the image based on their grayscale levels. Low-grayscale regions receive reduced dithering strength to minimize visible noise, while other regions may receive full dithering strength to preserve color information, achieving local optimization of image quality
Data Source
AI summary
A display device is provided, which includes a display, a ditherer configured to perform dithering of video data displayed on the display, an illumination sensor configured to sense illumination around the display device, and a processor configured to control driving of the ditherer on the basis of a grayscale level of the video data if or when the sensed illumination is lower than a predetermined value.