Abstract: A gamma correction device for a liquid crystal display device including LCD panels. The gamma correction device includes a storage device for storing gamma correction data corresponding to chiral directions of LCD panels. A chiral direction data acquisition circuit acquires chirality data on the chiral direction of a LCD panel arranged in the liquid crystal display device. A control circuit sets a gamma correction datum adapted to the chiral directions of the LCD panel arranged in the liquid crystal display device selectively from the stored gamma correction data based on the acquired chirality data. A gamma correction circuit performs a gamma correction process on image signals provided to the LCD panel using the set gamma correction datum.

Abstract: A gamma correction device for a liquid crystal display device including LCD panels. The gamma correction device includes a storage device for storing gamma correction data corresponding to chiral directions of LCD panels. A chiral direction data acquisition circuit acquires chirality data on the chiral direction of a LCD panel arranged in the liquid crystal display device. A control circuit sets a gamma correction datum adapted to the chiral directions of the LCD panel arranged in the liquid crystal display device selectively from the stored gamma correction data based on the acquired chirality data. A gamma correction circuit performs a gamma correction process on image signals provided to the LCD panel using the set gamma correction datum.

Abstract: In a liquid crystal projector provided with a cooling fan, the liquid crystal projector comprises a plurality of temperature sensors for detecting the internal temperature of the liquid crystal projector and a fan control circuit for controlling a driving voltage for the cooling fan on the basis of a temperature detected by each of the temperature sensors, the fan control circuit comprising means for calculating, on the basis of the temperature detected by each of the temperature sensors and a temperature range determined depending on the position where the temperature sensor is mounted, the ratio of the detected temperature to the temperature range for the temperature sensor; and means for controlling the driving voltage for the cooling fan on the basis of the maximum of the ratio of the detected temperature to the temperature range which has been calculated for each of the temperature sensors.

Abstract: In a liquid crystal projector provided with a cooling fan, the liquid crystal projector comprises a plurality of temperature sensors for detecting the internal temperature of the liquid crystal projector and a fan control circuit for controlling a driving voltage for the cooling fan on the basis of a temperature detected by each of the temperature sensors, the fan control circuit comprising means for calculating, on the basis of the temperature detected by each of the temperature sensors and a temperature range determined depending on the position where the temperature sensor is mounted, the ratio of the detected temperature to the temperature range for the temperature sensor; and means for controlling the driving voltage for the cooling fan on the basis of the maximum of the ratio of the detected temperature to the temperature range which has been calculated for each of the temperature sensors.