Patent ID: 9500935
Filing Date: 2016-11-22
CPC Classification: G02B,G03B,H04N

Claim Text:
1. A projection image display device comprising: a laser light source; a phosphor excited by excitation laser light emitted from at least one laser light source to emit light; a reflector into which at least one of laser light from the laser light sources and fluorescent light from the phosphor enters and which reflects light of a specific wavelength band while transmitting light of the other wavelength band; a plurality of diffusion plates that diffuse the laser light; at least one diffusion plate driver which moves the diffusion plates; and a spatial light modulation element that modulates the light output from the reflector, the diffusion plates being disposed on an optical path of the excitation laser light applied from the laser light source to the phosphor, wherein the excitation laser light applied to the phosphor from at least one of the laser light sources and light source laser light from the laser light source other than said laser light source pass through different optical paths before entering the reflector; and the diffusion plates are respectively arranged on the optical path of the excitation laser light before entering the reflector and on the optical path of the light source laser light before entering the reflector.