Patent ID: 9329467
Filing Date: 2016-05-03
CPC Classification: G03B,G06F,H04N,H05B

Claim Text:
1. A projector that includes a discharge tube and projects an image by using a light source including the discharge tube, the projector comprising: a discharge tube drive section that supplies the discharge tube with electric power; and an electric power control section that controls the level of the electric power with which the discharge tube drive section supplies the discharge tube to perform a normal mode in which the discharge tube drive section supplies electric power of a rated electric power level, a power saving mode in which the discharge tube drive section supplies electric power of a first power saving level lower than the rated electric power level when the image is not required to be projected, and a low luminance mode in which the discharge tube drive section supplies electric power of a second power saving level lower than the rated electric power level but higher than the first power saving level, and when the level of the electric power supplied to the discharge tube is changed from a normal mode to a low luminance mode, a speed at which the level of the electric power supplied to the discharge tube is changed is not restricted, but when the level of the electric power supplied to the discharge tube is changed to that in the power saving mode or raised from that in the power saving mode, the speed at which the level of the electric power supplied to the discharge tube is changed is set to a speed slower than a normal speed, and when the level of the electric power supplied to the discharge tube is changed from the first power saving level to an intermediate level which is lower than the rated electric power level and the second power saving level but higher than the first power saving level, a speed at which the level of electric power supplied to the discharge tube is changed is not restricted.