DISCHARGE LAMP LIGHTING DEVICE, AND IMAGE DISPLAY DEVICE

摘要

Provided is a discharge lamp lighting device comprising a power converting circuit having a voltage dropping chopper circuit (1) and a polarity inverting circuit (2) for converting the output of the voltage dropping chopper circuit (1) into an alternating voltage of a rectangular wave thereby to apply the voltage to a discharge lamp (La), and a memory unit (41f) for storing the history of the output of the power converting circuit at the previous lighting time. A control circuit (4) controls the ON/OFF of switching elements (Q1 to Q5) of the voltage dropping chopper circuit (1) and the polarity inverting circuit (2), so that the output of the power converting circuit is changed for a predetermined period from the lighting start to the stable lighting, on the basis of the history of the memory unit (41f). Thus, the control circuit (4) can suppress the rise of a lamp voltage (Vla) thereby to elongate the lifetime of a lamp and to suppress the occurrence of an arc jump.