Method for quickly calculating dominant wavelength of light-emitting diode

Abstract

The invention discloses a method for quickly calculating the dominant wavelength in the measurement of colorimetric parameters of a light-emitting diode (LED), which consists of a sectionalized judgment algorithm and a variable step size inquiry algorithm. The method is to acquire relative spectral energy distribution curve data P(lambda[i]) of the LED to be measured through a sensitimeter (CCD) of a spectrograph, calculate the chromaticity coordinate of the LED according to the color matching function of CIE 19312 degree *(lambda), *(lambda), *(lambda), take equal-energy white light WE(xe=0.3333, ye=0.3333) as a reference light source, sectionalize data with the wavelength range between 360 and 780 nanometers in a CIE1931 chromaticity diagram, judge the section with the dominant wavelength according to the chromaticity coordinate, and quickly calculate the dominant wavelength of radiant light of the LED to be measured by the variable step size inquiry algorithm, wherein the precision is 1 nanometer. The method 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 [0001] The invention belongs to the field of optoelectronic technology, and mainly relates to a chromaticity parameter testing technology of a light-emitting diode (LED), and more specifically relates to a method for quickly calculating a dominant wavelength in the measurement of a chromaticity parameter of a light-emitting diode (LED). Background technique [0002] 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 chromati...

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Problems solved by technology

[0018] 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 ,like Figure 4 shown

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