Patent ID: 9638926
Date: 2017-05-02
CPC Classifications: G02B,H04N

Claim:
1. A stereo projection apparatus with low throw ratio and high light efficiency, comprising: a polarized beam splitter assembly configured to split a projecting light beam of a projector into a transmitted light beam, a first reflective light beam and a second reflective light beam, the polarization direction of the transmitted light beam being orthogonal to the polarization direction of the first reflective light beam and the second reflective light beam; a polarization state transforming assembly configured to adjust the polarization state of the transmitted light beam or the polarization state of the first reflective light beam and the second reflective beam, such that the adjusted transmitted light beam, first reflective light beam and second reflective light beam have the same polarization state; a light path direction adjustment assembly configured to adjust a travel direction of the transmitted light beam or a travel direction of the first reflective light beam and the second reflective light beam, such that the adjusted transmitted light beam, first reflective light beam and second reflective light beam have the same travel direction; a light beam size adjustment assembly configured to adjust a coverage range of the transmitted light beam or a coverage range of the first reflective light beam and the second reflective light beam, such that projecting images of the adjusted transmitted light beam, first reflective light beam and second reflective light beam have the same size; and one of a light modulator and a quarter wavelength retardation film, the light modulator configured to modulate the adjusted transmitted light beam, first reflective light beam and second reflective light beam to left-circularly polarized light and right-circularly polarized light in accordance with a frame sequence, the quarter wavelength retardation film configured to transform the transmitted light beam, first reflective light beam and second reflective light beam into a 45-degree left-circularly polarized light and a 135-degree right-circularly polarized light.