Patent ID: 8998423
Filing Date: 2015-04-07
Classification: G02B,G03B,H04N

Abstract:
1. An image projection apparatus, comprising: a light source formed with a discharge lamp; a display device which displays blue, green, and red images by modulating illumination light from the light source at pixels; and a projection lens which projects the blue, green, and red images which are displayed at the display device, wherein the display device is formed with a digital micromirror device which reflects the illumination light with mirrors functioning as the pixels such that, as ON-light, light representing the image is directed to the projection lens, and, as OFF-light, light not representing the image is directed to an outside of the projection lens; and the following conditional expression is satisfied: where β γ denotes an angle that is, when a beam of the illumination light incident on the display device is specularly reflected by the mirrors of the display device which output the ON-light, formed between a direction in which the specularly reflected beam of the illumination light is outputted and a normal line of the image display surface, γ satisfying the following equation: γ=α−2·θ; d denotes a pixel pitch of the display device; α denotes an incidence angle of a beam of the illumination light incident on the display device with respect to the normal line of the image display surface; θ denotes a tilt angle of a normal line of the mirrors of the display device which output the ON-light with respect to the normal line of the image display surface; λ denotes a wavelength, the wavelength being 480 nm in a case of blue image display, 550 nm in a case of green image display, and 620 nm in a case of red image display; m denotes a positive integer; and k denotes a negative integer.