Sanyo Electric Co., Ltd.

Takahiro Totani

Hideyuki Kanayama

Hiroki Koba

Katsumi Terada

Syoichi Yoshii

Kazunobu Oketani

Kenji Tateishi

A liquid crystal projector device of the present invention includes, on an optical axis of a lamp unit, first and second integrator lenses having a plurality of cells arranged in the form of a matrix, a polarization beam splitter, and a slit plate having a plurality of slit apertures that allow light incidence on the polarization beam splitter. A concave lens for collimating light emitted from the lamp unit is arranged on a front of the lamp unit. The concave lens has a light incidence surface thereof formed with a concavity. The concavity is formed such that the slit apertures of the slit plate allow passage of a larger amount of light than that in the case of using a concave lens without any concavity formed thereon.

Projector device

A video signal processing circuit inputs a video signal to perform processing such as frequency conversion as well as processing for generating data representing the APL (Average Picture Level) of a frame video for each frame period. A microcomputer functions as a dimmer arithmetic block to perform processing for generating dimmer data upon receipt of APL data, and functions as a lamp driver control block to perform processing for sending out a dimmer command to a lamp driver. The lamp driver receives the dimmer command, to control an amount of light emitted from a light source (a lamp).

Projection type video display

A rear projection display device capable of reducing the depth of a display device itself, comprising an optical engine, first, second, third reflective mirrors arranged at such positions as to be easily held integrally with each other, a fourth reflective mirror, a plane reflective mirror for turn-back of light flux, and a screen.

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Daito, Japan

Takahiro Totani