Color Temperature Curve Adjustment for Display Devices
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Solution Overview
Problem
Conventional color temperature adjustment methods for display devices using Planckian locus or CIE daylight locus in CIE 1931 color space result in display colors that do not align with user visual preferences, leading to reduced viewing quality due to color leaning issues towards purple, pink, blue, or yellow.
Innovation Solution
A method that generates a new color temperature curve in CIE 1931 color space based on a color temperature range, Planckian locus, and CIE daylight locus, calculates a target color coordinate, and adjusts the brightness ratios and coefficients of red, green, and blue to align the display device's color temperature with user preferences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If color coordinate is set on Planckian locus or CIE daylight locus in CIE 1931 color space, then color temperature adjustment is achieved, but display color leans towards purple/pink at high temperature or red at low temperature which does not conform to user visual feel
Solution Approach 1:
The patent changes the color coordinate parameters by defining a new color temperature curve that deviates from the conventional Planckian locus and CIE daylight locus. This curve adjustment modifies the relationship between color temperature and color coordinates, enabling the display to achieve accurate color temperature while maintaining natural color perception that aligns with user visual expectations across different temperature ranges.
Solution Approach 2:
Instead of following the conventional approach of setting color coordinates directly on the Planckian or daylight locus, the patent inverts the problem by first establishing user-expected color characteristics and then deriving the appropriate color temperature curve. This reverse engineering approach ensures that color temperature adjustment does not compromise visual comfort.
2Temperature
If conventional color temperature adjustment is used, then color temperature can be changed, but watching quality is reduced due to color leaning issues
Solution Approach 1:
The patent modifies the color coordinate parameters along a newly defined temperature curve, adjusting the chromaticity coordinates at each color temperature point. This parameter transformation ensures that while color temperature varies as expected, the color leanings are corrected to maintain natural appearance and high watching quality across the entire temperature range.
Data Source
AI summary
A color temperature adjusting method of a display device includes follow steps: generating a color temperature curve in CIE 1931 color space according to a color temperature range, a Planckian locus and a CIE daylight locus in the CIE 1931 color space; calculating a target color coordinate at the color temperature curve corresponding to target color temperature; generating a new brightness ratio of red, green and blue, respectively, according to the target color coordinate and tristimulus values of the brightest red, the brightest green and the brightest blue of the display device; generating a coefficient of red, green and blue, respectively, according to the new brightness ratios of red, green and blue and the tristimulus values of red, green and blue; and adjusting the color temperature of the display device according to the coefficients of red, green and blue.