Discharge lamp lighting device, projector, and driving method of discharge lamp

摘要

In at least one embodiment of the disclosure, a discharge lamp lighting device includes a discharge lamp driving section that drives a discharge lamp and a control unit that controls the discharge lamp driving section. The control unit alternately performs a first-interval DC driving process and a first-interval AC driving process in a first interval, alternately performs a second-interval DC driving process and a second-interval AC driving process in a second interval other than the first interval, and changes a length of at least one of a period during which the first-interval DC driving process is performed and a period during which the second-interval DC driving process is performed so as to be shortened in a stepped manner within a predetermined sub-interval.

主权项

1. A discharge lamp lighting device comprising:
a discharge lamp driving section that drives a discharge lamp by supplying a driving current to the discharge lamp; and a control unit that controls the discharge lamp driving section, wherein the control unit
alternately performs a first-interval DC driving process and a first-interval AC driving process in a first interval,alternately performs a second-interval DC driving process and a second-interval AC driving process in a second interval other than the first interval,controls a first DC current that is configured by a first polarity component starting from a first polarity so as to be supplied as the driving current in the first-interval DC driving process,controls a first AC current that repeats the first polarity component and a second polarity component so as to be supplied as the driving current in the first-interval AC driving process,controls a second DC current that is configured by the second polarity component starting from a second polarity so as to be supplied as the driving current in the second-interval DC driving process,controls a second AC current that repeats the first polarity component and the second polarity component so as to be supplied as the driving current in the second-interval AC driving process, andchanges a length of at least one of a period during which the first-interval DC driving process is performed and a period during which the second-interval DC driving process is performed, so as to be shortened in a stepped manner within a predetermined sub-interval.