Patent ID: 9152027
Filing Date: 2015-10-06
Classification: G03B,H05B,Y02B

Abstract:
1. A projector that switches and alternately outputs a first image and a second image at a predetermined timing, comprising: a discharge lamp that includes a first electrode and a second electrode; a discharge lamp drive section that supplies electric current for driving the discharge lamp to the discharge lamp; a state detecting section that detects a state of deterioration of the discharge lamp; and a control section that controls the discharge lamp drive section, wherein a period interposed between switching timings which are temporally adjacent to each other starts in a first period and ends in a second period, wherein the control section controls the discharge lamp drive section so that an absolute value of the electric current is relatively decreased in the first period and is relatively increased in the second period, wherein in the second period, the control section performs a first control for controlling the discharge lamp drive section to supply an alternating current to the discharge lamp, a second control for controlling the discharge lamp drive section to supply, to the discharge lamp, an electric current in which a maximum value of a time when a first polarity in which the first electrode becomes the anode is continued is longer than a maximum value of a time when the first polarity is continued in the first control, and a third control for controlling the discharge lamp drive section to supply, to the discharge lamp, an electric current in which a maximum value of a time when a second polarity in which the second electrode becomes the anode is continued is longer than a maximum value of a time when the second polarity is continued in the first control, and wherein as the state of deterioration proceeds, the control section decreases at least one of the maximum value of the time when the first polarity is continued in the second control and the maximum value of the time when the second polarity is continued in the third control.