Projection-type display apparatus

An illumination optical system for use in a projection-type display apparatus that directs light from a light source through the illumination optical system to a display panel so that an image displayed on the display panel illuminated by the light directed thereto is projected through a projection optical system onto a screen, comprising:

• a light intensity uniformizing device of which an entrance surface is located at a first conjugate position that is substantially conjugate with the light source and of which an exit surface has a shape geometrically similar to a panel surface of the display panel;
• and
• a reflection optical system for forming an image of the exit surface of the light intensity uniformizing device on the panel surface of the display panel, the reflection optical system including:
• a first concave reflective surface for forming between the display panel and the light intensity uniformizing device a second conjugate position that is conjugate with the first conjugate position of the light source;
• and
• a second concave reflective surface for making the second conjugate position substantially conjugate with an entrance pupil of the projection optical system.

A projection-type display apparatus comprising:

• a light source for emitting light;
• a display panel for displaying an image;
• a condenser optical system for condensing light from the light source at a first conjugate position;
• a light intensity uniformizing device of which an entrance surface is located at the first conjugate position and of which an exit surface has a shape geometrically similar to a panel surface of the display panel;
• a reflection optical system for forming an image of the exit surface of the light intensity uniformizing device on the panel surface of the display panel;
• and
• a projection optical system for projecting the image displayed by the display panel onto a predetermined surface,
• wherein, each of at least two elements having an optical power, which is disposed between the exit surface of the light intensity uniformizing device and the display panel, is a reflective surface.

A projection-type display apparatus comprising:

• a light source for emitting light;
• a display panel for displaying an image;
• a condenser optical system for condensing light from the light source at a first conjugate position;
• a light intensity uniformizing device of which an entrance surface is located at the first conjugate position and of which an exit surface has a shape geometrically similar to a panel surface of the display panel;
• a projection optical system for projecting the image displayed by the display panel onto a predetermined surface;
• and
• a reflection optical system for forming an image of the exit surface of the light intensity uniformizing device on the panel surface of the display panel, the reflection optical system including:
• a first concave reflective surface for forming between the display panel and the light intensity uniformizing device a second conjugate position that is conjugate with the first conjugate position;
• and
• a second concave reflective surface for making the second conjugate position substantially conjugate with an entrance pupil of the projection optical system;
• system.

A rear projection apparatus comprising:

• a light source for emitting light;
• a display panel for displaying an image;
• a condenser optical system for condensing light from the light source at a first conjugate position;
• a light intensity uniformizing device of which an entrance surface is located at the first conjugate position and of which an exit surface has a shape geometrically similar to a panel surface of the display panel;
• a color filter, disposed near the entrance surface or exit surface of the light intensity uniformizing device, for changing colors of light exiting from the light intensity uniformizing device on a time-division basis to achieve color display;
• a reflection optical system for forming an image of the exit surface of the light intensity uniformizing device on the panel surface of the display panel, the reflection optical system including at least two elements;
• a projection optical system for projecting the image displayed by the display panel onto a predetermined surface;
• and
• a transmission-type screen onto which the projection optical system projects the image,
• wherein, each of the at least two elements of the reflection optical system having an optical power, which is disposed between the exit surface of the light intensity uniformizing device and the display panel, is a reflective surface.