Patent ID: 8272742
Filing Date: 2012-09-25
Classification: G03B

Abstract:
1. A single projection display device comprising: a light source; a reflective light valve that is illuminated with illumination light emitted from the light source and emits modulated light corresponding to an image signal; a polarized light separation plane that reflects the illumination light, which is in a predetermined linear polarization state, in a direction perpendicular to a traveling direction of the illumination light being incident on the polarized light separation plane and reflects the modulated light, which is caused by the reflective light valve to be in the predetermined linear polarization state, in a direction perpendicular to a traveling direction of the modulation light being incident on the polarized light separation plane; a reflection optical unit that reflects the linearly polarized illumination light, which is reflected by the polarized light separation plane, toward the reflective light valve, which is provided opposite to the reflection optical unit across the polarized light separation plane, while rotating a phase of the linearly polarized illumination light by 180 degrees; and a projection lens that enlarges and projects image information carried on the modulated light from the polarized light separation plane, wherein the projection lens satisfies the following conditional expressions: where S indicates a maximum length (inch) of a magnification-side image, OBJ indicates a magnification-side projection distance (m), and β indicates a magnifying power.