Method for improving calculation accuracy of dominant wavelength of light emitting diode

Abstract

The invention discloses a method for improving calculation accuracy of dominant wavelength in light emitting diode (LED) colourometry parameter measurement. The method comprises the following steps: acquiring a relative spectral energy distribution curve datum P (lambda i) of an LED to be measured by a charge coupled device (CCD) of a spectrograph, and calculating chromatic coordinates according to color matching functions of CIE-1931 2 DEG *(lambda), *(lambda) and *(lambda); and taking isoenergetic white light WE(xe=0.3333, ye=0.3333) as a reference light source, performing Lagrange interpolation through combination of multipoint slopes and slope reciprocals on the basis of calculating a slope d k of a link between a chromatic point of the isoenergetic white light WE on a CIE 1931 chromatic diagram and a chromatic point of luminescent color of the LED to be measured by segmentation and quick lookup algorithms and calculating the dominant wavelength with the accuracy of 1 nm lambda d, and calculating the dominant wavelength of radiant light of the LED to be measured with the accuracy less than 0.1 nm. The method improves the calculation accuracy greatly on the basis of increasing little calculation complexity, and has high practical value.

Description

Technical field: [0001] The invention belongs to the field of optoelectronic technology, and mainly relates to the chromaticity parameter test of a light-emitting diode (LED), in particular to a method for improving the calculation accuracy of the dominant wavelength of the light-emitting diode. 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 chromaticity parameters. [0003] For convenience, the relative ...

AI Technical Summary

Problems solved by technology

This brings difficulties to the high-precision calculation of the dominant wavelength of light-emitting diodes

Even if the relative spectral energy P(λ) distribution function is sampled by integer wavelengths, the accuracy of the dominant wavelength calculated through the chromaticity coordinate look-up table can only be accurate to 1nm

Images