Patent ID: 6157419
Filing Date: 2000-12-05
Classification: G02B,H04N

Abstract:
A projector comprising:a light source emitting light of undefined polarization;polarizing means for converting said light into linearly or circularly polarized light;light separating means for separating the light from said polarizing means into first, second and third colored lights having different colors from one another;three modulation means, each receiving one of said colored lights, for converting portions of light having a first linear polarization into portions of a second polarization different from said first linear polarization and for selecting one of said first and second polarizations, each modulation means comprising, disposed in succession along the optical path of the correponding colored light, a nematic type liquid crystal panel for rotating polarization directions of the portions of said first linear polarization, and polarization analyzer means for transmitting only one of said first and second polarizations,combining means for combining the colored lights passed through said nematic type liquid crystal panelsprojection means for projecting said combined lights; andthree polarization converting means each of which is disposed between said light separating means and corresponding one of said three modulation means, for converting said linearly or circularly polarized light into the light having the first linear polarization.