Blending Circuit for LED Display Flicker Reduction
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Solution Overview
Problem
Traditional dither computing methods used to increase color depth in LED displays result in a flicker phenomenon, especially noticeable at low refresh rates, due to the truncation of grayscale data and addition of dithering values.
Innovation Solution
An image processing circuit and method that includes a dither computing circuit and a blending circuit, where the blending circuit generates a blending weight based on input grayscale data and a threshold, allowing for a blending computation that reduces the dither ratio and minimizes flicker by adjusting the output between input and dithered grayscale data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If dither computing is applied to increase color depth and eliminate contour phenomenon, then the gradient continuity is improved, but a flicker phenomenon occurs due to periodic display of zero and non-zero grayscale data
Solution Approach 1:
The patent introduces a blending circuit as an intermediary between the dither computing circuit and the display output. This blending circuit mixes the original grayscale data with the dithered grayscale data according to a calculated blending weight, thereby mediating the harmful flicker effect while preserving the gradient continuity benefit. The blending weight is determined by comparing the original grayscale data with a threshold value, allowing dynamic adjustment of the mixing ratio to eliminate flicker in low grayscale regions while maintaining dithering benefits in higher grayscale regions.
2Measurement precision
If dither computing truncates lower bits of grayscale data and adds dithering values, then color depth is visually increased, but low grayscale values display as zero most of the time causing severe flicker at refresh rates below 60 frames/second
Solution Approach 1:
The patent dynamically changes the blending weight parameter based on the input grayscale data value. When the grayscale data is below a threshold, the blending weight is set to minimize or eliminate dithered data contribution, thereby stabilizing the display output and preventing flicker. This parameter adjustment allows the system to maintain high color depth precision through dithering when needed, while ensuring display stability when grayscale values are low and flicker would be problematic.
Data Source
AI summary
An image processing circuit is provided. The image processing circuit includes a dither computing circuit and a blending circuit. The dither computing circuit performs a dither computing on the input grayscale data to generate a dithered grayscale data. The blending circuit receives the input grayscale data and the dithered grayscale data, generates a blending weight by comparing the input grayscale data with a first threshold, and performs a blending computing on the input grayscale data and the dithered grayscale data based on the blending weight to output an output grayscale data.