Illumination system and projector adopting the same

摘要

An illumination system which realizes a color image by using a light emitting device or a light emitting device array without a color wheel, and a projector adopting the illumination system, are disclosed. An illumination system includes at least one light emitting device (10) for emitting a light beam having a predetermined wavelength, and a holographic optical element (18) arranged on an optical path, for reducing the cross section of the light beam emitted from the light emitting device. A projector includes an illumination system including at least one light emitting device for emitting a light beam having a predetermined wavelength, the illumination system further comprising a holographic optical element arranged on an optical path for reducing the cross section of the light beam emitted from the light emitting device, a display device for forming an image by processing a light beam emitted from the illumination system according to an input image signal, and a projection lens unit for magnifying the image formed by the display device and projecting the magnified image onto a screen.