Patent ID: 6525785
Filing Date: 2003-02-25
Classification: G02B,H04N

Abstract:
A transmission-type liquid crystal projection display, comprisingan incident light source for providing a single polarized light; a light-separating unit separating said polarized light into three colored light beams, each one of three primary wavelengths; three transmission-type liquid crystal displays respectively corresponding to said three colored light beams; an L-shaped dichroic polarizing prism set for synthesizing said three colored light beams into a single output light beam, said L-shaped dichroic polarizing prism set including two adjacent dichroic polarizing prisms and a cubically shaped equivalent optical path glass block, a light beam incident onto said cubically shaped equivalent optical path glass block passing therethrough free of change of direction and undergoing a reflection in a respective one of said dichroic polarizing prisms being in juxtaposition to said cubically shaped equivalent optical path glass block; optical path adjusting means for guiding said three colored light beams to travel from said light-separating unit through said corresponding liquid crystal displays to said L-shaped dichroic polarizing prism set; and a projection lens for projecting out said output light beam.