Mitsubishi Electric Corporation

Taisuke Murata

Kazuo Kadowaki

Tatsuro Hirose

A rear-projection type display device has a projection device, a transmission type screen, a housing, and input means. The projection device projects a light from a light source, as an optical image. The optical image is projected to the transmission type screen. The housing accommodates the projection device and the transmission type screen. A user operation is inputted to the input means. The rear-projection type display device includes a storage section, a distortion amount detection section, a correction amount calculation section, and a correction section. The storage section stores a distortion detection image to be displayed on the transmission type screen. The distortion amount detection section changes the distortion detection image in accordance with an operation inputted from the input means, and detects a distortion amount of the image based on operations inputted by the input means until the distortion detection image displayed on the transmission type screen is brought into a predetermined state. The correction amount calculation section calculates a correction amount based on the distortion amount. The correction section corrects an image projected by the projection device, based on the calculated correction amount.

Rear-projection type display device for performing distortion detection and distortion correction

A laser light-source apparatus according to the present invention is equipped with: a laser-driving circuit board, thermal insulators that are placed on the laser-driving circuit board; a heat receiving plate that is placed on the thermal insulators and thermally insulated from the laser-driving circuit board, a laser light-source module that is installed on the heat receiving plate so as to be thermally connected to the heat receiving plate and is also electrically connected to the laser-driving circuit board so as to be driven thereby, and a heat sink that is thermally connected to the heat receiving plate via a heat pipe.

Laser light-source apparatus and projector apparatus

An enclosure of a dichroic mirror system that synthesizes a plurality of monochromatic laser beams emitted from a laser light source to output synthesized light is a structure having a dichroic mirror system lower enclosure and a dichroic mirror system upper enclosure joined to each other, and includes a light-leakage protecting structure that is formed by a convex portion formed at an end of the dichroic mirror system lower enclosure and a concave portion formed at an end of the dichroic mirror system upper enclosure engaged with each other at a joint therebetween.

Projection display system

A projection-type image display apparatus that projects an image onto a screen and includes a laser light source, an optical engine, a projection lens, and a control unit. The laser light source includes a plurality of light source units that respectively emit laser beams of different wavelengths. The optical engine combines the laser beams received from the light source and forms an image. An optical sensor is arranged in the optical engine to detect a physical property of a uniformly-scattered laser beam and outputs a physical property signal indicative of the detected physical property to the control unit. The control unit controls output powers of the light source units based on the physical property signal.

Projection-type image display apparatus

A rear projection display includes a projector for projecting light from a light source as an optical image, an exterior cabinet for enclosing the projector, a projection screen provided for the exterior cabinet on which the optical image is projected, and two or more optical sensors provided in a region where the optical image is projected from the projector other than an image display region.

Growing community of inventors

Tokyo, Japan

Taisuke Murata