LED Color Calibration Viewer with D65 Spectrum Matching
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Solution Overview
Problem
Current color calibration systems for imaging devices face challenges in achieving accurate color calibration due to the limited gamut of traditional color charts and viewers, particularly with the use of fluorescent lights that do not closely match the CIE standard light source D65, leading to inadequate color rendering and increased color differences in high saturation and broad color gamut applications.
Innovation Solution
A color calibration viewer with specific spectrum characteristics, including relative intensities at 505 nm and 620 nm, and a ratio of optical intensities at these wavelengths, is developed, utilizing LEDs and a transmittance adjusting layer to closely mimic the CIE standard light source D65, and a color chart with a broad color gamut is designed to include color bars with peak wavelengths and half-widths optimized for accurate color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluorescent light is used as the color calibration viewer, then the device is simple and inexpensive, but the color rendering is inadequate and does not closely match the CIE standard light source D65
Solution Approach 1:
The patent changes the spectral parameters of the light source by using LEDs with specific peak wavelengths (450-470nm for blue, 530-550nm for green, 610-650nm for red) and controlling their intensity ratios to match the CIE D65 standard. This parameter optimization enables accurate color rendering while maintaining device simplicity
Solution Approach 2:
The patent employs a composite lighting system combining multiple LED types with different spectral characteristics. By integrating blue LEDs, green LEDs, and red LEDs in specific combinations with controlled intensity ratios, the system achieves D65 standard compliance while keeping the structural design straightforward
2Measurement precision
If a color chart with broad color gamut is used, then the color calibration accuracy is improved, but a corresponding viewer with matching spectral characteristics is required which increases system complexity
Solution Approach 1:
The patent optimizes the spectral parameters of the LED-based viewer to match the broad color gamut color chart. By adjusting the peak wavelengths and intensity ratios of the LED components, the system achieves precise color calibration without requiring complex spectral control mechanisms
Solution Approach 2:
The patent designs a universal LED-based viewer that can work with both traditional color charts and broad color gamut color charts. The multi-functional lighting system maintains compatibility across different color calibration standards while achieving high measurement precision
3Manufacturing precision
If the relative intensity at 505 nm is increased to match CIE D65 standard, then color rendering in the green region is improved, but the ratio with 620 nm intensity must be precisely controlled which complicates manufacturing
Solution Approach 1:
The patent establishes specific parameter ranges for LED intensity ratios (505nm intensity: 0.80-0.95, 620nm intensity: 0.65-0.80, ratio A/B: 1.00-1.46) that are optimized to match CIE D65 standard. These parameter specifications enable precise spectral control while simplifying the manufacturing process by providing clear target ranges
Solution Approach 2:
The patent applies local quality optimization by specifically tuning the spectral characteristics at critical wavelengths (505nm and 620nm) while maintaining overall system simplicity. The localized parameter control at these key wavelengths achieves D65 compliance without requiring complex control across the entire spectrum
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
The solution enables accurate color calibration of imaging devices by providing a viewer that closely matches the CIE standard light source D65, reducing color differences and improving color rendering, especially in high saturation and broad color gamut scenarios, thereby enhancing the precision of color reproduction.
Implementation Method 1
the light source is an LED
Implementation Method 2
a transmittance adjusting layer disposed at a surface from which the light of the LED emits
Data Source
AI summary
A color calibration viewer used in color calibration, wherein: the relative intensity at a wavelength of 505 nm is 0.80 or more and 0.95 or less, and the relative intensity at a wavelength of 620 nm is 0.65 or more and 0.80 or less, where 1 designates the optical intensity of a peak top in a first wavelength region at a wavelength of 440 nm or more and 470 nm or less; and the ratio (A/B) of A and B is 1.00 or more and 1.46 or less, where A designates the optical intensity at a wavelength of 505 nm, and B designates the optical intensity at a wavelength of 620 nm.