LED Chromaticity Measurement Using Spectral Trajectory Interpolation
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Solution Overview
Problem
Current methods for measuring dominant wavelength and color purity of LED lamps are inefficient and inaccurate, often requiring complex calculations and cumbersome processes, such as partitioning and curve fitting, which reduce calculation efficiency and precision.
Innovation Solution
A method involving the acquisition of standard data on the CIE 1931 contour line, calculation of included angles, and interpolation to determine the dominant wavelength and color purity of LED lamps, eliminating the need for partitioning and curve fitting, and allowing for rapid and accurate calculations using a one-to-one correspondence of wavelength and chromaticity coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the mapping method is used to calculate dominant wavelength from chromaticity coordinates, then the calculation process is simple and intuitive, but the measurement precision is poor and cannot obtain accurate results
Solution Approach 1:
The patent introduces a spectral trajectory as an intermediary element between the chromaticity coordinates and the dominant wavelength. By establishing a one-to-one correspondence relationship between the spectral trajectory and the CIE 1931 contour line, the method enables accurate determination of dominant wavelength through interpolation along the spectral trajectory, resolving the contradiction between simplicity and precision.
2Measurement precision
If the slope-calculation look-up table method is used, then the measurement precision can be improved, but the calculation operation becomes complicated and calculation efficiency is reduced
Solution Approach 1:
The patent performs preliminary action by pre-establishing the one-to-one correspondence relationship between the spectral trajectory and the CIE 1931 contour line. This pre-computed relationship allows for rapid interpolation and calculation of dominant wavelength without requiring complex real-time calculations, thus improving both precision and efficiency.
3Measurement precision
If the partition method is used to determine dominant wavelength, then the measurement precision can be improved, but the calculation process becomes very cumbersome due to many partitions
Solution Approach 1:
The patent merges the spectral trajectory with the CIE 1931 contour line into a unified one-to-one correspondence relationship. This merging eliminates the need for separate partitioning steps and complex calculation processes, while maintaining high measurement precision through the integrated interpolation approach.
4Ease of operation
If the function fitting method is used to calculate dominant wavelength, then the calculation process is simpler, but the measurement precision is relatively poor causing larger errors
Solution Approach 1:
The patent replaces the mechanical curve fitting process with a direct geometric interpolation approach along the spectral trajectory. By using the one-to-one correspondence relationship between the spectral trajectory and the CIE 1931 contour line, the method achieves both simplicity and high precision without requiring complex function fitting calculations.
Data Source
AI summary
A method and device for measuring dominant wavelength and color purity of LED lamp, and an electronic equipment. The method includes: establishing standard data; calculating difference and distance between chromaticity coordinate in the standard data and the chromaticity coordinate of equal-energy white light; calculating an included angle between a vector formed by the chromaticity coordinate of equal-energy white light to each standard chromaticity coordinate and a positive direction of x axis; performing a one-way processing on the included angle to form included angle data; calculating an included angle intermediate value; determining minimum and maximum values of the included angle intermediate value; calculating a dominant wavelength coefficient and a measured included angle intermediate value; calculating a wavelength interval corresponding to the included angle intermediate value; calculating a dominant wavelength intermediate value and x difference by interpolation calculation; and obtaining dominant wavelength and color purity of the LED lamp.