Patent ID: 7661823

Claim:
A prism structure, comprising: a plurality of liquid crystal devices each including a liquid crystal panel and a light emitting-side optical element, and generating an image light through modulation of any of a plurality of color lights in accordance with image information; and a cross dichroic prism that combines the image lights coming from the liquid crystal devices, each of the liquid crystal devices further including: a fixture member that is fixed to the cross dichroic prism; a retention member that keeps hold of the liquid crystal panel, and is fixed to the fixture member, the retention member having a single guiding arc-shaped hole for rotation adjustment of the light emitting-side optical element; a light emitting-side optical element retention member that (1) keeps hold of the light emitting-side optical element, (2) is rotation-adjustable about an illumination axis, (3) is provided with only two pins for insertion into the guiding arc-shaped hole, and (4) is rotation-adjusted about the illumination axis before fixation to the retention member; and a fixing member that fixes the light emitting-side optical element retention member to the retention member.