Patent ID: 7566134

Claim:
A projection-type display device, comprising: a light source; a spatial light modulation element that modulates incident light according to an applied image signal and emits the modulated light; an illumination optical system that condenses light emitted by the light source and illuminates the spatial light modulation element with the condensed light; a projection lens that projects light emitted from the spatial light modulation element; a shielding unit, positioned on either an illumination optical system side of the spatial light modulation element or a projection lens side of the spatial light modulation element, that varies an amount of shielding of light transmitted through the shielding unit to change an angular distribution of light emitted by the spatial light modulation element; an image signal correction unit that divides a picture plane of the spatial light modulation element into a plurality of areas and performs, for each of the plurality of areas, uniformity correction on the image signal applied to the spatial light modulation element in accordance with a current level of shielding by the shielding unit; and a three-dimensional correction unit that supplies, to the image signal correction unit, three-dimensional interpolation data C (X, Y, Z) for a level Z image signal at an arbitrary pixel G (X, Y) of the spatial light modulation element, the image signal correction unit performing the uniformity correction using the three-dimensional interpolation data C (X, Y, Z), the three-dimensional correction unit including: a position computation unit that determines, based on coordinates (X, Y) of the arbitrary pixel G (X, Y), an address of the arbitrary pixel G (X, Y) and a position block in which the arbitrary pixel G (X, Y) is located and outputs address data (Xb, Yb), and a three-dimensional interpolation unit that interpolates output levels for the level Z image signals at arbitrary coordinates based on the address data (Xb, Yb) received from the position computation unit and correction data Cc (Xc, Yc, Zc) associated with the current level of shielding to generate the three-dimensional interpolation data C (X, Y, Z).