Triple-lens type projection display with uniform optical path lengths for different color components

Abstract

A triple-lens type projection display includes a source for generating a white primary beam output, a first beam splitter for splitting the white primary beam output into a first color component and a secondary beam output, a second beam splitter for splitting the secondary beam output into a second color component and a third color component, first, second and third light modulators for modulating the first, second and third color components, respectively, a first projection lens for receiving the first color component from the first light modulator, a second projection lens for receiving the second color component from the second light modulator, and a third projection lens for receiving the third color component from the third light modulator. Each of the first, second and third color components has a respective optical path length that is measured from the first beam splitter to a respective one of the first, second and third light modulators. The optical path lengths of the first, second and third color components are equal.