Patent ID: 7857458

Claim:
An image display device, comprising: a time-division illumination unit that generates a plurality of different monochromatic light beams sequentially in a time-division manner for time-divisional illumination; a light valve that is operable to form a plurality of sub frames of a target image when each of the monochromatic light beams is illuminating the light valve; a control unit that controls the light valve during illumination of one of the monochromatic light beams so as to form a monochromatic image corresponding to the one of the monochromatic light beams; and a light path shift unit that is operable to shift a light path of an output light beam from the light valve according to a frame period of the target image to form a sub frame of the target image at different positions from the other sub frames formed by the light valve, wherein the time-division illumination unit includes a color-switching unit configured to, in one frame period of the target image, divide at least one of the monochromatic light beams having a predetermined wavelength band into at least two portions in the time-division manner, the light path shift unit shifts the light path of the output light beam from the light valve at least when one or more of the portions of the monochromatic light beam having the predetermined wavelength band is illuminating the light valve, and illumination is performed in the time-division manner according to the timing of the light path shift operation of the light path shift unit.