Patent ID: 7959298

Claim:
A projection display apparatus, comprising: a light source that radiates white light; light-emitting-surface-forming optical elements that condense light emitted from the light source so as to form a light-emitting surface; a rotary color filter that is disposed in a vicinity of the light-emitting surface and has plural types of color filters for selectively transmitting or reflecting, in a predetermined order, particular colors of light of white light emitted from the light-emitting surface; a spatial light modulator that is disposed so as to be in substantially a conjugate relationship with the light-emitting surface, and modulates incident light in accordance with a video signal, so as to display an image; an illumination optical element that condenses light emitted from the rotary color filter to form illumination light for illuminating the spatial light modulator; a projection lens that projects an image formed by the spatial light modulator; and a control device that controls rotation of the rotary color filter so as to be in synchronization with the image display by the spatial light modulator, wherein the control device performs divisional driving for switching a state of displaying an image with respect to each of a plurality of partial display regions of the spatial light modulator that correspond respectively to a plurality of partial light-emitting regions defined by dividing the light-emitting surface in a rotation direction of the rotary color filter, so that each of the partial display regions is switched between a normal image display state and an OFF state for cutting off light, in synchronization with passing of a boundary line between each pair of adjacent ones of the color filters of the rotary color filter over each of the partial light-emitting regions.