Display Signal Processing With Grayscale Pixel Dispersion
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Solution Overview
Problem
The increase in video data frame rate leads to a longer ringing period relative to the horizontal scanning period, exacerbating the deterioration of gradation reproducibility in displays due to ringing, which existing methods fail to adequately address.
Innovation Solution
A signal processing device that generates a stepwise waveform signal with non-selection and selection periods based on a grayscale histogram, transforming pixel values to disperse them across these periods, thereby reducing simultaneous switch-offs and minimizing load fluctuations and ringing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the frame rate of video data is increased, then the display refresh speed is improved, but the ringing period becomes relatively longer with respect to the horizontal scanning period, causing deterioration of gradation reproducibility
Solution Approach 1:
The patent segments the pixels with the same display gradation into multiple groups and assigns different display gradations to each group. This segmentation prevents all pixels with the same gradation from being simultaneously turned off, thereby distributing the load fluctuation events across different time points within the horizontal scanning period. This resolves the contradiction by maintaining high frame rate while preventing the ringing that would otherwise occur due to simultaneous switch-offs.
Solution Approach 2:
The patent performs preliminary processing of the video data before display, specifically transforming the pixel values through grayscale transformation. This preliminary action redistributes pixels with the same original gradation across different display gradations, ensuring that they do not coincide in time during the horizontal scanning period. This pre-distribution prevents the simultaneous switch-off problem that causes ringing, while maintaining the high frame rate capability.
2Ease of operation
If many analog switches are simultaneously turned off within a horizontal scanning period, then the display operation is simplified, but a large load fluctuation occurs in the ramp waveform signal causing ringing
Solution Approach 1:
The patent divides pixels with the same display gradation into multiple groups that are turned off at different time points. This segmentation of the switching operation prevents the simultaneous turn-off of many analog switches, thereby eliminating the large load fluctuation that causes ringing, while still maintaining the overall simplicity of the display operation through systematic control.
Solution Approach 2:
The patent dynamically adjusts the display gradations of different pixel groups based on their temporal distribution within the horizontal scanning period. By making the display gradation assignment dynamic rather than static, the system prevents simultaneous switch-offs and the resulting ringing, while adapting to the specific timing requirements of each pixel group.
Data Source
AI summary
A stepwise waveform generation data generator is configured to generate stepwise waveform generation data having a data value corresponding to each display gradation within each horizontal scanning period, and a time length corresponding to the number of pixels of each of the display gradations for generating a stepwise waveform signal, based on a gradation value of each of the display gradations and start time of the display gradation period for each of the display gradations. A grayscale-transformed video data generator is configured to generate grayscale-transformed video data, which is video data obtained by transforming pixel values of each pixel in the horizontal scanning periods of video data into pixel values that are dispersed so as to correspond to the selection periods corresponding to the display gradations.