Patent ID: 7252384

Claim:
A projection display apparatus comprising: a light source for emitting white light; a first color separating optical system for reflecting blue light and passing green light and red light from the white light emitted from said light source; a second color separating optical system for reflecting the green light and passing the red light from the green light and the red light which have passed through said first color separating optical system; first modulating means for modulating the blue light reflected by said first color separating optical system; second modulating means for modulating the green light reflected by said second color separating optical system; third modulating means for modulating the red light having passed through said second color separating optical system; a color combining optical system for combining the blue light, the green light, and the red light which have been modulated by said first modulating means, said second modulating means, and said third modulating means, respectively; a first lens disposed in a blue light path between said first color separating optical system and said first modulating means; and a second lens disposed in a green light path between said second color separating optical system and said second modulating means; wherein a length of the blue light path from said first color separating optical system to said first modulating means is equal to the length of the green light path from said second color separating optical system to said second modulating means; wherein a distance between said first lens and said first modulating means in the blue light path is shorter than the distance between said second lens and said second modulating means in the green light path.