Patent ID: 6404558
Filing Date: 2002-06-11
Classification: G02B

Abstract:
A projection display comprising:a light source for generating a beam output that contains first, second and third color components; a color separation/synthesizing prism unit having a color separation part for separating the beam output from said light source into the first, second and third color components that exit said prism unit in three different directions; first, second and third light modulator means, disposed adjacent to said prism unit, for modulating the first, second and third color components that exit from said color separation part of said prism unit; said prism unit further having a color synthesizing part that receives the modulated first, second and third color components from said first, second and third light modulator means and that synthesizes the modulated first, second and third color components so as to form an output beam; and a projection lens for receiving the output beam from said color synthesizing part of said prism unit, and for projecting a color image; wherein the first, second and third color components have equal optical path lengths measured from said light source to the respective one of said first, second and third light modulator means; and wherein the first, second and third color components have equal optical path lengths measured from the respective one of said first, second and third light modulator means to said projection lens.