Patent ID: 8469525

Claim:
A projection-type display apparatus that projects an image onto a screen to perform image display, the projection-type display apparatus comprising: at least one light source that emits a coherent light; an illuminating optics that propagates a light flux emitted from the light source on a predetermined optical path to guide the light flux to the screen; a light valve that forms the image to be displayed on the screen in an illuminated area that is illuminated by the light flux guided by the illuminating optics; and a projection optics that magnifies and projects the image, which is formed in the illuminated area of the light valve, onto the screen, wherein the illuminating optics comprising a first diffusion unit that diffuses the propagated light flux and is arranged on the optical path near a conjugated position with the light valve, and a light intensity equalizing device that equalizes intensity distribution of the light flux emitted from the light source, and a conjugated position with the light valve is near an exit surface of the light intensity equalizing device.