Method for quickly calculating dominant wavelength of light-emitting diode

Abstract

The invention discloses a method for measuring the dominant wavelength of a light-emitting diode (LED), which is applied to the photoelectric technology field, consisting of the following steps: realizing online measurement and separation of colorimetric parameters of the LED according to the dominant wavelength of the LED, obtaining a series of discrete relative spectral energy distribution curve data P(lambda[i]) of the measure LED through a sensitimeter of a spectrograph, and calculating the chromaticity coordinate of the LED according to the color matching function of CIE-19312 degree, calculating the exact dominant wavelength through a separated section judgment algorithm and a various step length inquest algorithm. The invention reduces the calculation of the dominant wavelength, improves the working efficiency, and is used for the online measurement and the separation of the colorimetric parameters of the LED.

Description

technical field The invention belongs to the field of optoelectronic technology, and mainly relates to a chromaticity parameter testing technology of a light-emitting diode (LED), more specifically, a method for measuring the dominant wavelength of the light-emitting diode. Background technique Light-emitting diode (LED) is a solid light-emitting device that directly converts electrical energy into light energy. Strong and other advantages are widely used in lighting, traffic lights, outdoor advertising display and instrument display and other fields. In the application of light-emitting diodes, as a light source, color is a key factor affecting the display effect, and its wavelength characteristics determine the color. Since the radiant energy distribution of a light-emitting diode is a narrow-band quasi-monochromatic light spectrum, it is particularly important to measure its chromaticity parameters. For convenience, the relative spectral energy distribution P(λ) is usu...

AI Technical Summary

Problems solved by technology

Obviously, the method of finding the dominant wavelength by point-by-point look-up table is very computationally intensive and cannot meet the requirements of fast online measurement in actual production

In addition, if equal-energy white light W E (xe=0.3333, ye=0.3333) is used as a reference light source to calculate the dominant wavelength. Since the slope of the ±90° straight line is ±∞, the result calculated by formula (3) diverges around 554nm and 555nm, and there is a possibility of overflow error ,As shown in Figure 4