Patent ID: 8210685

Claim:
A projection display apparatus comprising: a red imager configured to modulate a red component light according to a red input signal; a green imager configured to modulate a green component light according to a green input signal; a blue imager configured to modulate a blue component light according to a blue input signal; a polarization adjusting element configured to adjust polarization of a fourth color component light; a color combining unit configured to combine lights emitted respectively from the red imager, the green imager, and the blue imager; and a controller configured to control a voltage to be applied to the polarization adjusting element, wherein a superimposed component light, which is any one of the red component light, the green component light, and the blue component light, enters the polarization adjusting element together with the fourth color component light, the polarization adjusting element transmits the superimposed component light, whereas transmitting the fourth color component light by adjusting the polarization of the fourth color component light in accordance with switching between a low voltage applied state and a high voltage applied state of the polarization adjusting element, and the controller controls re-orienting operation of applying a high voltage to the polarization adjusting element, wherein the superimposed component light and the fourth color component light emitted from the polarization adjusting element enter a specific imager which is one of the red imager, the green imager, and the blue imager corresponding to the superimposed component light, in the high voltage applied state, the polarization of the fourth color component light entering the specific imager is aligned with the polarization of the superimposed component light, and when the low voltage applied state lasts more than a predetermined period of time, the controller performs the re-orienting operation in a frame where luminance should take precedence over color reproducibility.