Driving method for discharge lamp, driving device for discharge lamp, light source device, and image display apparatus

摘要

A driving device for a discharge lamp includes: an alternating current supply section adapted to supply an alternating current between two electrodes of the discharge lamp; and a frequency modulation section adapted to modulate a frequency of the alternating current by providing a plurality of periods with frequencies of the alternating current different from each other within a period of modulation, wherein the frequency modulation section makes at least one period of the plurality of periods with the frequency one of equal to and lower than a predetermined reference frequency shorter than before a predetermined condition is satisfied in response to the predetermined condition being satisfied.