DMD Spectral Matching for Low Metameric Color Reproduction
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Solution Overview
Problem
Current systems for representing device-dependent colors struggle with accurate color matching, particularly in reducing metamerism and expanding color gamut, despite advancements in using multiple primaries.
Innovation Solution
A digital micromirror device (DMD) is employed to spectrally match device-independent colors by modulating a full visible electromagnetic spectrum, utilizing thousands of primary color channels to minimize metamerism and achieve precise color representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional RGB or CMYK color systems are used, then device complexity is low, but color gamut is limited and metamerism cannot be reduced
Solution Approach 1:
The invention segments the visible spectrum into multiple discrete wavelength bands, with each band represented by a separate LED primary. Instead of using only three broad-spectrum primaries (RGB), the system divides the spectrum into numerous narrow bands (e.g., 380-780 nm divided into multiple segments), allowing precise control over spectral composition and dramatically expanding color gamut while reducing metamerism.
Solution Approach 2:
The invention applies local quality by assigning specific spectral characteristics to each primary color channel. Each LED primary is selected to emit at a specific wavelength or narrow band, creating localized spectral purity. This allows different regions of the spectrum to be independently controlled, enabling accurate reproduction of spectral power distributions across the entire visible range.
2Measurement precision
If the number of color primaries is increased to reduce metamerism, then color matching accuracy improves, but device complexity increases
Solution Approach 1:
The invention changes the fundamental parameters of the color system by transitioning from three broad-spectrum primaries to numerous narrow-band LED primaries. Each primary is characterized by its specific peak wavelength and spectral width, allowing the system to match spectral power distributions with high precision. This parameter change enables accurate color matching under various illuminants while providing the flexibility to reduce metamerism.
3Adaptability or versatility
If multiple LED primaries are used to expand color gamut, then color representation improves, but control complexity increases
Solution Approach 1:
The invention achieves universality by creating a color system that can function under multiple illuminants and reproduce diverse spectral power distributions using the same set of LED primaries. The system can adapt to different viewing conditions and color matching requirements by adjusting the intensity of each primary, providing a universal solution for accurate color representation across various applications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides a two-orders-of-magnitude improvement in color matching accuracy, significantly reducing metamerism and expanding the color gamut, allowing for more accurate representation of device-independent colors across different illuminations.
Implementation Method 1
A digital micromirror device (DMD) is employed to spectrally match device-independent colors by modulating a full visible electromagnetic spectrum
Data Source
AI summary
The present invention is directed to a method of utilizing a digital micromirror device (DMD) to spectrally matching a standard or device-independent color. DMD can be fitted on an integrated chip and can provide more than one thousand (1,000) color primary channels for low metameric color matching producing a spectrally matched batch color. This represents a two orders of magnitude improvement in color matching.