Method for modulating color temperature in visible band

摘要

A color temperature modulating method involves: computing blackbody spectrums including a target color temperature, and performing normalization at a benchmark wavelength to define a common color-temperature area; selecting a white LED containing phosphor; adjusting the white LED's intensity such that the primary-peak wavelength is close to a maximum relative intensity in the common color-temperature area accordingly; using a blue LED, a green LED, and at least two red LEDs, wherein peak wavelengths of the blue and green LEDs are located between the primary and the secondary wavelength of the white LED, and peak wavelengths of the red LEDs are greater than the primary-peak wavelength; and adjusting relative intensities of the blue, green, and red LEDs to make a relative intensity of a combination of these LEDs and the white LED close to the target color temperature.

主权项

1. A method for modulating color temperature in visible band, comprising the following steps:
selecting a benchmark wavelength, and computing a plurality of blackbody spectrums for different color temperatures and performing normalization at the benchmark wavelength so as to define a common color-temperature area, wherein the blackbody spectrums include a target color temperature; selecting a white LED containing phosphor, wherein the white LED has a spectral curve including a primary-peak wavelength and a secondary-peak wavelength; adjusting the white LED in terms of relative intensity so as to make a relative intensity of the primary-peak wavelength and a relative intensity of the secondary-peak wavelength close to maximums of the common color-temperature area corresponding to the relative intensities of the primary-peak wavelength and of the secondary-peak wavelength respectively; using a first blue LED, a second blue LED, at least one green LED and at least two red LEDs, wherein peak wavelengths of spectral curves of the first blue LED, the second blue LED, and the at least one green LED are located between the primary-peak wavelength and the secondary-peak wavelength, and peak wavelengths of spectral curves of the at least two red LEDs are greater than the primary-peak wavelength; and adjusting relative intensities of the first blue LED, the second blue LED, the at least one green LED, and the at least two red LEDs, so as to make a color-temperature curve of a combination of these LEDs and the white LED close to the target color temperature.