Projection-type Image Display Device

摘要

An image projecting unit of a projector includes a light source; a polarization control element which controls a polarization direction of light emitted from the light source; and a projecting unit which projects the image light that passed through the optical modulation element. The control unit detects a deterioration state of the polarization control element based on the projected image which is taken by an image-taking unit when a test image representing a single color throughout a screen is projected.