US Patent No. 10,268,109

PROJECTOR AND IMAGE LIGHT PROJECTION METHOD


Patent No. 10,268,109
Issue Date April 23, 2019
Title Projector And Image Light Projection Method
Inventorship Osamu Wakabayashi, Tokyo (JP)
Assignee NEC DISPLAY SOLUTIONS, LTD., Tokyo (JP)

Claim of US Patent No. 10,268,109

1. A field sequential type projector, comprising:a plurality of light sources that output primary color lights each having a peak wavelength in a primary color wavelength region, the primary color lights having different peak wavelengths in the primary color wavelength region;
an illumination optical system that includes a video image formation device that spatially modulates the primary color lights output from said plurality of light sources to form an image light, and guides the primary color lights output from said plurality of light sources to the video image formation device;
a projection optical system that projects the image light formed by the video image formation device,
wherein among the primary color lights output from said plurality of light sources, a luminance of the primary color light having a longest peak wavelength is the same as that of the primary color light having a shortest peak wavelength,whereinthe primary color light is a blue light; and
a phosphor wheel on which the blue lights output from said plurality of light sources are irradiated, and
said phosphor wheel includes a phosphor region that emits the blue light as an excitation light, and a reflection region that reflects the blue light.