Sanyo Electric Co., Ltd.

Satoshi Hosoda

Kenji Yamauchi

Kouji Terami

Yoshihiko Yano

A liquid crystal projector includes a reference temperature sensor, a comparison temperature sensor, and a shut-off unit for shutting off the power to a light source lamp for backlight when the difference between a temperature sensed by the reference temperature sensor and a temperature sensed by the comparison temperature sensor is more than a predetermined value. Used as the reference temperature sensor is a temperature sensor for sensing the ambient temperature of the main body of the liquid crystal projector, and used as the comparison temperature sensor is a temperature sensor for sensing the ambient temperature of a liquid crystal panel. Alternately, used as the reference temperature sensor is a temperature sensor for sensing the ambient temperature of the main body of the liquid crystal projector, and used as the comparison temperature sensor is a temperature sensor for sensing the ambient temperature of the light source lamp for backlight.

Liquid crystal projector

A liquid crystal projector provided with one or a plurality of cooling fans comprises a temperature sensor for sensing the internal temperature of the liquid crystal projector, and a driving control circuit for controlling the driving voltage of the cooling fan on the basis of the temperature sensed by the temperature sensor. A driving control circuit controls the driving voltage of the cooling fan in proportion to the temperature sensed by the temperature sensor in a case where the temperature sensed by the temperature sensor is within a predetermined range.

Growing community of inventors

Gifu, Japan

Satoshi Hosoda