A projection-type display apparatus of the invention aiming at solving the problem of heat generation caused by absorption of light by a polarizing means of a liquid crystal light valve. To overcome this problem, the projection-type display apparatus of the invention includes a light source, a light valve for modulating the light from the light source, and a projection optical means for projecting the light modulated by the light valve, with the light valve including a liquid crystal panel and a...

A projector prevents deterioration in optical characteristics of liquid crystal panels caused by heat generated by polarizers, and sticking of dirt onto the light-outgoing surface of the liquid crystal panels. Polarizers are disposed adjacent to the light-outgoing surfaces of liquid crystal panels, while other polarizers are disposed adjacent to the light-incoming surfaces of the liquid crystal panels. The liquid crystal panels and the two polarizers disposed adjacent to the light-incoming and l...

The distance between reflection surfaces of a light guide is set in such a manner as to gradually decrease toward an exit end surface from an incidence end surface. Thus, the equation is satisfied, where SX designates the arrangement intervals of light source images in the direction along the X-axis, SY denotes the arrangement intervals of the light source images in the direction along the Y-axis, MX designates the length of the incidence end surface of the light guide in the direction along the...

In a rear projector for projecting an image from behind a screen, its screen size is variable. In order to permit flexible adaptation to the variation in the screen size, the projector is constructed to permit easy adjustment of a detection device for detecting an image display position or a position indicated on the screen.

A projector includes a duct having a connecting end for connection to an air inlet provided in a housing, and an air intake end for drawing in outside air for cooling the interior of the projector. The duct is made of a soft or flexible material and is capable of altering its shape. Thus, the duct can change the position of the air intake end in space, for example, to different positions. Further, the duct is pivotable on a pivot axis, and thus can change the opening direction of the air intake ...

The invention provides a projector capable of cooling a light-source lamp efficiently and suppressing noises as well. In a first cooling system, the base side of a light-source lamp, which reaches a high temperature, is intensively cooled by a first sirocco fan. An axial-flow exhaust fan is provided close to the light-source lamp so that cooling air is allowed to quickly flow while cooling the light-source lamp. Therefore, even when the first sirocco fan, in which the air pressure of cooling air...

The invention concerns achieving an increase in illumination efficiency of an illumination optical system in a projector using an optical modulation device. A projector may include an optical modulation device for controlling a direction of emission of illumination light applied to a substantially rectangular light application surface, including a plurality of pixels, for each pixel according to image information to thereby emit image light representing an image, an illuminating optical system f...

The present invention provides a technique that reduces color non-uniformity in a color image projected and displayed by a projector. The projector that projects and displays the color image includes an illumination optical system, a color light separation optical system, first through third electro-optical devices, a color light synthesizing optical system, and a projection optical system. The projector generally has one or a plurality of light bundle adjustment optical systems provided in one ...

All of optical elements constituting a projecting optical system 10 are reflection mirrors 1 to 4. The reflection mirrors 1 to 4 are arranged in a plate-shaped support member 6 with a relative positional relation between the reflection mirrors being fixed. A position of the whole projecting optical system 10 with respect to an image-forming component 5 is adjust by moving the support member 6.

An aspect of the invention provides a duct capable of cooling optical modulation systems with high efficiency while realizing miniaturization and reduction of the mounted number of cooling fans. The duct can be used for a projector including plural optical modulation systems, a dichroic prism, and a projection lens, and the respective optical modulation systems include liquid crystal panels, entrance side polarization plates, viewing angle correction plates, and exit side polarization plates. Th...