Patent ID: 9532439
Filing Date: 2016-12-27
CPC Classification: H04N,H05B

Claim Text:
1. A discharge lamp driving device comprising: a discharge lamp driving unit which supplies drive power to a discharge lamp; and a control unit which controls the discharge lamp driving unit according to a waveform of the drive power; wherein the waveform has n (n being a natural number equal to or above 2) launching periods and a low-power mode lighting period, the n launching periods include: the control unit, in an x-th (x being a natural number equal to or above 2 and equal to or below n) launching period, supplies the discharge lamp with a drive current having a drive frequency equal to or below a drive frequency of a drive current supplied to the discharge lamp in an (x−1)th launching period, and the control unit adjusts at least the drive frequency that is a part of the drive frequencies in the plural launching periods according to a degree of deterioration of the discharge lamp.