Laser projector

Abstract

The invention provides a laser projector which comprises a laser light source, a diffusion plate, a polarizing beam splitter, a quarter-wave plate and a fluorescent pink wheel. The laser light source is used for generating a laser beam which travels along a first optical path. The diffusion plate is arranged on the first optical path to diffuse the laser beam to generate a diffusion beam, and the half-peak half width of the diffusion beam is larger than or equal to 1.5 degrees and is smaller than or equal to 3 degrees. The polarizing beam splitter is used for reflecting the diffusion beam to generate a reflection beam which travels along a second optical path. The quarter-wave plate is arranged on the second optical path and converts the reflection beam into a first circularly polarized beam. The fluorescent pink wheel receives the first circularly polarized beam to generate a second circularly polarized beam and a stimulated light beam with an optical path opposite to the second optical path. The quarter-wave plate also is used for converting the second circularly polarized beam into a P polarized beam, and the polarizing beam splitter allows the penetration of the P polarized beam and the stimulated light beam. By using the laser projector, the probability of a thermal quenching phenomenon of the fluorescent pink wheel is reduced.

Description

technical field [0001] The invention relates to a laser projector, in particular to a polarization splitting laser projector. Background technique [0002] Laser projectors use laser diodes (Laser Diode) as excitation light sources to make phosphors emit light of different wavelengths such as yellow, red, green or blue, which are used as light sources for projectors. At present, the existing laser projectors can be roughly divided into two categories: reflective laser projectors and polarization-splitting laser projectors. The light source shines on the fluorescent pink wheel, so that the fluorescent powder on the fluorescent pink wheel is excited to produce fluorescent light. However, because the energy density of the laser beam is too high, it is easy to cause thermal quenching of the fluorescent pink wheel, causing the excitation efficiency of the fluorescent pink wheel to decrease rapidly with the increase of the laser power, and may even The fluorescent pink wheel was...

AI Technical Summary

Problems solved by technology

Wherein, the wavelength difference between the curve 110 and the curve 120 is called the spectral gap (spectral gap) of the polarization beam splitter, and when the spectral gap is not wide enough, it will limit the laser diode used as the laser light source in the process of manufacturing the laser projector. selectivity

Furthermore, since there is a wavelength tolerance of about ±5nm between laser diodes, if the wavelength deviation of some laser diodes in the laser projector light source is large, it will lead to poor light combining efficiency of the projector, which will affect the projection. machine brightness

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