Color Temperature Compensation for Multi-Primary Displays
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Solution Overview
Problem
Multi-primary-color displays experience 'color shift' due to poor blue weight distortion after color temperature compensation, as the blue gamma curve differs from the standard gamma curve, leading to inaccurate white color temperature maintenance.
Innovation Solution
A color temperature compensation method that determines the intensities of red, green, and blue colors in a three-dimensional color signal, using lookup tables and digital gamma correction to adjust the weights of blue color differently for pure and impure white frames, ensuring the blue color maintains appropriate brightness and aligns with the standard gamma curve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the brightness of blue color weights is reduced to maintain white color temperature in multi-primary-color display, then the white color temperature can be kept at specific range, but the blue gamma curve deviates from standard gamma curve causing poor blue display and color shift
Solution Approach 1:
The patent applies dynamics by making the blue color weight adjustment conditional rather than fixed. The system dynamically determines whether to reduce blue color brightness based on whether the frame contains pure white content, using frame detection mechanisms to switch between different processing modes (pure white frame mode vs. non-pure white frame mode), thereby adapting the color temperature compensation strategy to different display scenarios
Solution Approach 2:
The patent changes the parameter of blue color weight dynamically. In pure white frames, the blue color weight is reduced to maintain color temperature; in non-pure white frames, the blue color weight is restored or enhanced to maintain accurate blue color display. This parameter change is implemented through gamma correction curves that are selectively applied based on frame content detection
2Temperature
If uniform gamma correction is applied to all frames for color temperature compensation, then white color temperature can be maintained, but blue color distortion occurs in non-pure white frames
Solution Approach 1:
The patent segments the video content into two distinct categories: pure white frames and non-pure white frames. This segmentation is achieved through frame detection mechanisms that analyze the content of each frame. Different gamma correction strategies are then applied to each segment: one strategy for pure white frames (reducing blue color weight) and another strategy for non-pure white frames (maintaining or enhancing blue color weight), thereby avoiding blue color distortion in non-pure white frames while still maintaining color temperature in pure white frames
Data Source
AI summary
A color-temperature-compensation (CTC) method and applications thereof are provided, and which includes determining intensities of weights of three colors in an inputted three-dimension color signal; if yes, performing a lookup table mechanism to find-out a first set of multi-primary-color (MPC) signal corresponding to the three colors with the same weights, and performing a digital-gamma-correction (DGC) to the first set of MPC signal for providing a first set of CTC signal accordingly; if no, performing the lookup table mechanism to find-out a second set of MPC signal corresponding to the three colors with different weights, and performing the DGC to the second set of MPC signal for providing a second set of CTC signal accordingly; and making at least one same color with the same intensity in the three colors with the same weights and in the three colors with different weights displaying on an MPC display have different brightness.