Video Display White Balance Adjustment via LUT Recalculation
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Solution Overview
Problem
Existing video display apparatuses require time and effort for users to set conversion data for gamma correction and white balance adjustment, particularly needing three points for gamma correction and additional settings for R, G, and B data, which is inconvenient.
Innovation Solution
A video display apparatus with a video processor that adjusts white balance using LUTs for red, green, and blue luminance levels, allowing users to intuitively adjust correction data through a controller that recalculates and rewrites LUTs based on user-selected adjustment points, enabling flexible and convenient white balance adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gamma correction uses three-point adjustment (maximum point, minimum point, and arbitrary adjustment point), then luminance correction accuracy is improved, but operation complexity and time required increase
Solution Approach 1:
The patent divides the gamma correction operation into two independent parts: luminance correction (using only minimum and maximum points) and chromaticity correction (white balance adjustment). This segmentation allows users to perform luminance correction with simpler two-point adjustment while maintaining accuracy, and separately handle chromaticity adjustment, thereby reducing overall operation complexity.
Solution Approach 2:
The patent extracts the white balance adjustment function from the gamma correction process. By separating chromaticity correction from luminance correction, users no longer need to set three points for gamma correction and additional points for white balance. The extracted white balance function can be adjusted independently with fewer parameters, reducing the total number of settings required.
2Measurement precision
If white balance adjustment requires setting conversion data for R, G, and B data separately, then chromaticity correction accuracy is improved, but operation time and complexity increase
Solution Approach 1:
The patent merges the white balance adjustment controls for R, G, and B channels into a unified interface. Users can adjust chromaticity parameters (such as color temperature or preset modes) that automatically update all three color channels simultaneously. This combining approach maintains accurate chromaticity correction across all channels while reducing operation time by eliminating the need to adjust each channel separately.
3Manufacturing precision
If multiple adjustment points are used for LUT correction, then correction accuracy is improved, but device complexity and calculation load increase
Solution Approach 1:
The patent applies partial action by using only the necessary adjustment points (minimum and maximum) for luminance correction in the LUT, rather than requiring three or more points. This partial approach achieves sufficient correction accuracy for most practical applications while significantly reducing calculation load and simplifying the adjustment interface. The system performs adequate correction without the excessive complexity of multi-point adjustments.
Data Source
AI summary
In a video display apparatus A, a controller 9, while displaying video processed by a video processor 4 on a video display 3, displays LUTs 45R, 45G, and 45B which are tables of correction data for correcting luminance levels of red, green, and blue respectively. The controller 9 re-calculates and rewrites the correction data based on one adjustment point or two or more adjustment points P1 and P2 adjusted by the user.