Patent ID: 8922722

Claim:
A projection apparatus for providing multiple viewing angle images, comprising: a light source module for sequentially providing a first light beam and a second light beam having a light path different from that of the first light beam; a polarizing light splitting element, having a light incident surface, a first light exiting surface and a second light exiting surface, the light incident surface optically coupling with the light source module, the polarizing light splitting element being used to split the first light beam into a first polarized light beam and a second polarized light beam and to split the second light beam into a third polarized light beam and a fourth polarized light beam, the first polarized light beam and the third polarized light beams being in a first polarized direction, and the second polarized light beam and the fourth polarized light beams being in a second polarized direction; a first reflective light valve, being optically coupled with the first light exiting surface to reflect the first and the third polarized light beams; a second reflective light valve, being optically coupled with the second light exiting surface to reflect the second and the fourth polarized light beams; and a light combining element, being optically coupled with the first and the second reflective light valves to reflect at least a portion of the first and the third polarized light beams that are reflected by the first reflective light valve, and to allow at least a portion of the second and the fourth polarized light beams that are reflected by the second reflective light valve to transmit therethrough; wherein, the projection apparatus further comprise: a first transmissive light valve unit and a second transmissive light valve unit, the first transmissive light valve unit being disposed between the first light exiting surface of the polarizing light splitting element and the first reflective light valve, and the second transmissive light valve unit being disposed between the second light exiting surface of the polarizing light splitting element and the second reflective light valve; wherein the first transmissive light valve unit converts at least a portion of the first or the third polarized light beam into the first or the third polarized light beam in the second polarized direction, the second transmissive light valve unit converts at least a portion of the second or the fourth polarized light beam into the second or the fourth polarized light beam in the first polarized direction, and the light combining element is a polarizing light combining element.