Projection-type display apparatus

A projection-type display apparatus, comprising:

• a light source;
• color separating means for separating a white light beam emitted from said light source into three color beams;
• three light valves for modulating said separated color beams;
• light guide means located on an optical path of a color beam having a longest optical path length among said color beams separated by said color separating means and respectively incident on said light valves;
• color synthesizing means for synthesizing a projection beam from said color beams modulated through said light valves;
• a projection lens for projecting said projection beam onto a screen;
• uniform illumination optical means interposed on an optical path between said light source and said color separating means for converting said white light beam emitted from said light source into a uniform rectangular beam and for outputting said uniform rectangular beam toward said color separating means;
• and
• three condenser lenses located respectively in outputting portions of said color separating means for outputting said color beams, said condenser lenses converting said color beams output from said uniform illumination optical means and separated by said color separating means into almost collimated beams, wherein said color synthesizing means is a dichroic prism, said light guide means is provided with an incident side triangular prism located on an incident side for folding an optical path at a right angle, an output side triangular prism located on an output side for folding the optical path at a right angle, and a light guide member located between said triangular prisms.

A projection-type display apparatus, comprising:

• a light source;
• color separating means for separating a white light beam emitted from said light source into three color beams;
• three light valves for modulating said separated color beams;
• light guide means located on an optical path of a color beam having a longest optical path length among said color beams separated by said color separating means and respectively incident on said light valves;
• color synthesizing means for synthesizing a projection beam from said color beams modulated through said light valves;
• a projection lens for projecting said projection beam onto a screen;
• uniform illumination optical means, interposed on an optical path between said light source and said color separating means, for converting said white light beam emitted from said light source into a uniform rectangular beam and for outputting said uniform rectangular beam toward said color separating means;
• three condenser lenses located respectively in outputting portions of said color separating means for outputting said color beams, said condenser lenses converting said color beams emitted from said uniform illumination optical means and separated by said color separating means into almost collimated beams;
• and
• cooling means for cooling said light source, wherein said color synthesizing means is a dichroic prism, said light guide means includes an incident side reflecting mirror, an output side reflecting mirror and at least one lens, an optical path is formed so that the direction of the projection beam from said projection lens is parallel and reverse to the direction of said white light beam emitted from said light source, the cooling means for said light source is located in an apparatus case on an output side of said projection beam, and a vent of said cooling means is formed on a side surface of said apparatus case on the output side of said projection beam.