DISCHARGE LAMP LIGHTING DEVICE AND IMAGE DISPLAY APPARATUS

摘要

A discharge lamp lighting device includes: a power converting circuit including a step-down chopper circuit (1) and a polarity inversion circuit (2) configured to convert an output from the step-down chopper circuit (1) to a rectangular-wave alternating-current voltage, and thus to apply the rectangular-wave alternating-current voltage to a discharge lamp (La); and a memory (41f) configured to store a history of an output from the power converting circuit in a previous stable lighting mode. A control circuit (4) controls the on and off of each of switching elements (Q1 to Q5) in the step-down chopper circuit (1) and the polarity inversion circuit (2), and thereby changes the output from the power converting circuit in a predetermined time period after the lamp starts lighting until reaching a stable lighting state on the basis of the history stored in the memory (41f), so that a rise of a lamp voltage Vla is suppressed. This enables extension of the lifespan of the lamp and suppression of the occurrence of arc jump.