Driving method for discharge lamp, driving device for discharge lamp, light source device, and image display apparatus
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United States of America Patent
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Aug 5, 2014
Grant Date -
Jun 10, 2010
app pub date -
Dec 2, 2009
filing date -
Dec 5, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
In at least one embodiment of the disclosure, a driving device for a discharge lamp includes an alternating current supply section and a frequency modulation section. The alternating current supply section supplies two electrodes of the discharge lamp with an alternating current. The alternating current comprises a plurality of modulation periods. The frequency modulation section modulates a frequency of the alternating current so as to provide a plurality of retentive periods within each of the modulation periods. Each retentive period has a constant frequency that is different from a frequency of its temporally adjacent retentive periods. The frequency modulation section shortens a length of at least one of the retentive periods in the modulation period in response to a predetermined condition occurring. The frequency of at least one of the retentive periods is equal to or less than a predetermined reference frequency.
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