Projection device and projection-type video display device

摘要

Provided are a projection device and a projection-type video display device capable of displaying a plurality of videos, allowing speckles to be inconspicuous, and miniaturizing an optical system. A projection device includes an optical element including light diffusion elements capable of diffusing light, an irradiation device configured to irradiate the optical element with illumination light beams, each illumination light beam scanning the corresponding light diffusion element, spatial light modulators, each spatial light modulator being illuminated with illumination light beam which is incident from the irradiation device to each light diffusion element to be diffused, and projection optical systems, each projection optical system projecting modulation image obtained on each spatial light modulator on corresponding screen. The illumination light beam, which is incident to each position of each light diffusion element to be diffused, overlappedly illuminates on corresponding spatial light modulator.

主权项

1. A projection device displaying video corresponding to each screen on a plurality of the screens, comprising:
an optical element comprising a plurality of light diffusion elements capable of diffusing light; an irradiation device configured to irradiate the optical element with a plurality of illumination light beams, each illumination light beam scanning the corresponding light diffusion element; spatial light modulators, each spatial light modulator being illuminated with illumination light beam which is incident from the irradiation device to each light diffusion element to be diffused; and projection optical systems, each projection optical system projecting modulation image obtained on each spatial light modulator on corresponding screen, wherein the illumination light beam, which is incident to each position of each light diffusion element to be diffused, overlappedly illuminates on corresponding spatial light modulator, and wherein the irradiation device comprises: a light source configured to generate a coherent light beam; a light division unit configured to divide the coherent light beam from the light source to generate a plurality of divided light beams; optical fibers, each optical fiber transmitting each divided light beam from the light division unit; and a scan device configured to change propagation direction of each divided light beam transmitted by the optical fibers and allow each divided light beam as each illumination light beam to scan the corresponding light diffusion element.