Abstract: A xenon lamp drive unit of the present invention comprises: a charging circuit; and a current control circuit adapted to supply a current to a xenon lamp by using a charged voltage of the charging circuit as a power source, wherein the current control circuit is adapted to supply, in a first period after a lamp ignition, a high output lamp current having a higher current value than a steady output lamp current to the xenon lamp by constant current control and supply, in a second period after the first period, the steady output lamp current to the xenon lamp by constant current control.

Abstract: A xenon lamp drive unit of the present invention comprises: a charging circuit; and a current control circuit adapted to supply a current to a xenon lamp by using a charged voltage of the charging circuit as a power source, wherein the current control circuit is adapted to supply, in a first period after a lamp ignition, a high output lamp current having a higher current value than a steady output lamp current to the xenon lamp by constant current control and supply, in a second period after the first period, the steady output lamp current to the xenon lamp by constant current control.

Abstract: According to one embodiment, a projection type display apparatus, which modulates a laser beam generated from a laser beam generating element according to an input video signal and projects the modulated laser beam onto a screen via a projection lens so as to display a video, sets a light quantity of the laser beam based on information representing a size of the screen so that an optical power of the laser beam per unit area on the screen falls within a range conforming to predetermined safety standards and brightness on the screen can be secured at a maximum, and controls the laser beam generating element so that the laser beam of the set light quantity is generated.

Abstract: A projection type display device of the invention includes a lamp unit (4) having a lamp holder (44) for holding a lamp, a power source cooling fan (6) for cooling a power source unit (3), and a duct (8) through which air caused to circulate by driving of the power source cooling fan (6) is guided, and which has at least a part of a wall portion defined by the lamp holder (44), so that heat exchange is performed between the air sent out by the power source cooling fan (6) and the lamp holder (44).

Abstract: Each of a power source unit for a projection type display device, and the projection type display device having the same of the present invention includes a box (91) for accommodating therein a substrate (92) having heating elements (92b) mounted thereto, a fan (94) for a lamp power source which causes air to flow into the box (91), a partitioning portion (95b) for partitioning the inside of the box (91), and discharge holes (95d) which are formed in the partitioning portion (95b) and through which the air is blown to the heating elements (92b).

Abstract: A selector selects a video signal from video signals input via any of a plurality of video input terminals, and outputs the thus-selected video signal. A plurality of video signal detection sections determine whether or not video signals are being supplied from the plurality of video input terminals. When a video signal is newly detected, a plurality of video signal determination sections determine a format of the video signal. A signal processing section performs, on the video signal output from the selector, signal processing in accordance with a result of the determination output from the signal determination sections. When the video signal is newly detected during a period in which no video signal is being supplied to the plurality of video input terminals, control means causes the selector to select the thus-detected video signal.