Patent ID: 8282216
Filing Date: 2012-10-09
Classification: G02B,H04N

Abstract:
1. A single-imager projection engine assembly, comprising: a light source adapted to induce illumination light in a first direction, the illumination light comprising a first polarized illumination light in a first polarization state and a second polarized illumination light in a second polarization state perpendicular to the first polarization state; a polarization beam splitter (PBS) assembly comprising: a first polarization beam splitting film adapted to receive the illumination light at a first incident angle, reflect the first polarized illumination light in the first polarization state as a first polarization reflected light in the first polarization state in a second direction, and transmit the second polarized illumination light in the second polarization state, a second polarization beam splitting film adapted to receive and transmit the second polarized illumination light in the second polarization state passing through the first polarization beam splitting film at a second incident angle; and a first 3-sided prism comprising a first side face, a second side face and a third side face, the first polarization beam splitting film and the second polarization beam splitting film are adherently attached to the first side face and the second side face while the third side face is facing the projection lens system; a reflective quarter wave composite plate adapted to reflect the second polarized illumination light in the second polarization state passing first through the first polarization beam splitting film and secondly through the second polarization beam splitting film, while the second polarized illumination light in the second polarization state is polarization rotating by 90 degree as a third polarization illumination light in the first polarization state in opposition to the first direction, wherein the second polarization beam splitting film receives and reflects the third polarization illumination light in the first polarization state as a second polarization reflected light in first polarization state in a second direction; a reflective polarization modulation imager, adapted to receive, 90-degree polarization modulate and reflect: the first polarization reflected light in the second direction as a first modulated light in the second polarization state, and the second polarization reflected light in the second direction as a second modulated light in the second polarization state; and a projection lens system adapted to receive and project the first modulated light and the second modulated light in opposition to the second direction.