Colour-sequential projection system

摘要

An image display device includes a light source unit (100) which successively emits illumination lights of different colors which have wavelength bands different from one another in accordance with color information of an image signal, an image modulating unit (200) which successively modulates the illumination lights of different colors in accordance with the color information of the image signal and generates modulated lights, a light path shift unit (300) capable of shifting a light path of the modulated lights, and a projection optical unit (400) which projects the modulated lights, wherein the light path shift unit includes a first wavelength selectable polarization rotation device (310) configured to carry out rotation control on polarization directions of the modulated lights modulated by the image modulating unit in accordance with colors and a first birefringent plate (320) to which the modulated lights from the first wavelength selectable polarization rotation device are applied.