Patent ID: 7787080

Claim:
A projection system comprising: a projector that emits imaging light, a polarization screen that selectively reflects, of the imaging light emitted from the projector, only light in a specified state of polarization to display an image, and a reflecting element placed on an optical path between the projector and the polarization screen to reflect the imaging light, emitted from the projector and to project the same onto the polarization screen, the reflecting element comprising: a first reflective layer that selectively reflects only light in a specified wave range and transmits light in other wave ranges, and a second reflective layer that reflects light in another wave range covering at least one wave range other than the specified wave range of the light reflected by the first reflective layer, wherein either the first or the second reflective layer is a polarization-maintaining reflective layer that reflects circularly polarized light while maintaining the state of polarization of the circularly polarized light, and the other reflective layer is a polarization-reversing reflective layer that reflects circularly polarized light while reversing the state of polarization of the circularly polarized light, wherein the projector emits imaging light containing circularly polarized light whose state of polarization varies according to the wave range of the light, and the first and the second reflective layers in the reflecting element have polarization characteristics and reflection wave ranges corresponding to the state of polarization and the wave range of the circularly polarized light contained in the imaging light emitted from the projector in such a manner that the state of polarization of the circularly polarized light, after being reflected from the first and the second reflective layers, is uniform irrespective of the wave range of the light.