Patent ID: 9176369
Filing Date: 2015-11-03
Classification: G03B,H04N,H05B

Abstract:
1. A projector comprising: a discharge lamp configured to emit light; a discharge-lamp driving unit configured to supply a driving current for driving the discharge lamp to the discharge lamp; a control unit configured to control the discharge-lamp driving unit; a light modulating element configured to modulate, according to a video signal, the light emitted from the discharge lamp; and a projection optical system configured to project the light modulated by the light modulating element on a projection surface, wherein the control unit is a control waveform unit configured to alternately repeat a high luminance period in which the driving current having a relatively large absolute value is supplied to the discharge lamp and a low luminance period in which the driving current having a relatively small absolute value is supplied to the discharge lamp, the control unit controlling the discharge-lamp driving unit according to a driving current waveform formed by the control waveform unit including a direct-current waveform pattern in which the driving current in a first high luminance period, the driving current in a first low luminance period immediately after the first high luminance period, and the driving current in a second high luminance period immediately after the first low luminance period have the same first polarity.