LUT Adjustment for Image Display White Balance and Brightness
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Solution Overview
Problem
Image display devices face challenges in achieving appropriate white balance and γ adjustments to match various chromaticity characteristics, particularly with high-grayscale images, as existing methods risk limiting maximum brightness and failing to provide effective chromaticity corrections.
Innovation Solution
An image display device and LUT adjustment method that include an input value adjustment unit, a LUT with a gain or offset, a conforming adjustment value acquisition unit, a LUT extension unit, and a calculation unit to calculate LUT correction data, allowing for appropriate white balance and γ adjustments by normalizing adjustment values and extending LUT output ranges to maximize brightness and correct high-grayscale images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the LUT correction data is calculated and created using one standard panel, then the chromaticity characteristics can be standardized, but the maximum brightness of the display is limited by the maximum output value of the LUT
Solution Approach 1:
The patent extends the LUT output range by introducing a scaling dimension. Instead of being constrained by the fixed maximum output value of the standard LUT, the system scales the LUT output values by a scaling factor that can exceed 1.0, thereby extending the brightness range beyond the original LUT maximum while preserving chromaticity accuracy through the conforming adjustment values.
Solution Approach 2:
The patent changes the parameter of LUT output scaling by introducing conforming adjustment values that scale the LUT output. This allows the system to adjust the maximum brightness parameter independently from the chromaticity correction parameters, enabling both standardization and maximum brightness utilization.
2Adaptability or versatility
If gain adjustment is performed to match dynamic range, then the dynamic range is optimized, but the maximum brightness potential of the display is not fully utilized
Solution Approach 1:
The patent introduces dynamic scaling through conforming adjustment values that can be adjusted based on the specific display panel characteristics. The system dynamically determines the appropriate scaling factor to maximize brightness while maintaining proper dynamic range, allowing adaptation to different panel types and conditions.
Solution Approach 2:
The patent performs preliminary calculation of conforming adjustment values that pre-scale the LUT output to maximize brightness potential. By pre-computing these scaling factors based on panel characteristics, the system prepares the optimal brightness utilization before actual image display, ensuring maximum brightness is achieved without compromising dynamic range.
3Ease of manufacture
If the same LUT and gain value are used for all panels, then manufacturing is simplified, but the chromaticity characteristics differ from standard due to individual panel variations
Solution Approach 1:
The patent applies local quality by calculating panel-specific conforming adjustment values for each display panel based on its individual characteristics. Instead of using a universal LUT for all panels, the system tailors the LUT output scaling to each panel's specific chromaticity properties, ensuring standardization while accounting for individual variations.
Solution Approach 2:
The patent changes the LUT output scaling parameter based on individual panel measurements. By adjusting the conforming adjustment values for each panel, the system maintains manufacturing simplicity while achieving precise chromaticity characteristics specific to each panel's properties.
Data Source
AI summary
An image display device includes a microcomputer and LUTs which are tables of correction data used to correct color balance of images. The microcomputer sets LUT extensions and calculates the LUTs based on: (1) the normalized values GainLn of the L conforming adjustment values GainL and the normalized values GainHn of the H conforming adjustment values GainH; (2) the normalized values Lin of the input values Liref of the image data of the L adjustment image and the normalized values Hin of the input values Hiref of the image data of the H adjustment image; (3) the correction data of the LUTs; and (4) the correction data of the LUT extension units.