Dimming Method of White Light Emitting Diode

Abstract

The invention provides a dimming method of a white light emitting diode, the method comprising: separately measuring the spectral power of the red light emitting diode, the yellow light emitting diode, the blue light emitting diode and the green light emitting diode in the working state of the rated current; The relative light mixing ratio of the red light emitting diode, the yellow light emitting diode, the blue light emitting diode and the green light emitting diode; according to the relative light mixing ratio, the red light emitting diode, the yellow light emitting diode The light emitting diode, the blue light emitting diode and the green light emitting diode output control signals with different duty ratios; wherein, the peak wavelength of the red light emitting diode is between 670nm and 700nm. The white light emitting diode prepared by the invention has high color rendering property, low blue light hazard, and adjustable color temperature, so that the white light emitting diode with high color rendering property and low blue light harm can be obtained at any color temperature.

Description

technical field [0001] The invention relates to the technical field of light-emitting diodes, in particular to a dimming method for white light-emitting diodes. Background technique [0002] Light Emitting Diode (LED for short) is a component made of semiconductor materials. Because it can convert electrical energy into light, it is a tiny solid-state light source. It not only has small size, long life, and low driving voltage. , fast response rate and excellent shock resistance, and can meet the design requirements of light, thin, short, and small, and are widely used in various products in daily life. Among them, white light-emitting diodes are very common in daily life, but the blue light hazard and color rendering of white light-emitting diodes are difficult to realize simultaneously in the existing market. According to the national standard "Standards for Photobiological Safety of Lamps and Lamp Systems" (GB / T20145-2006), short-wavelength (about 410nm-480nm) light is m...

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Problems solved by technology

Among them, white light-emitting diodes are very common in daily life, but the blue light hazard and color rendering of white light-emitting diodes are difficult to realize simultaneously in the existing market

According to the national standard "Standards for Photobiological Safety of Lamps and Lamp Systems" (GB / T20145-2006), short-wavelength (about 410nm-480nm) light is more harmful to the human retina, among which blue light with a wavelength of 435nm-440nm The harm to the retina is the greatest, so the mainstream LED white light source technology has caused the hidden danger of blue light hazards. In addition, filtering the blue light component in the spectrum is a common method to reduce the harm of blue light, but this will affect the color reproduction of white light to blue, reducing the Color rendering of lighting white light

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