| 摘要 |
PROBLEM TO BE SOLVED: To light a plurality of discharge lamps so that luminance deviation due to unevenness in stray capacity of load does not occur. SOLUTION: A discharge lamp lighting device is provided with a plurality of discharge tubes 1a, 1b, connected in series, and an electromagnetic transformer T having a common primary winding 11 and two secondary windings 12(1), 12(2). One vacant electrode of the plurality of discharge tubes connected in series is connected to a high voltage terminal of one secondary winding of the electromagnetic transformer. The other vacant electrode of the discharge tubes connected in series is connected to a high voltage terminal of the other secondary winding of the electromagnetic transformer. Low voltage terminals of the two second windings are grounded respectively. Each of the high voltage terminals of the two secondary windings are applied with a voltage of an inverted phase respectively. The lighting device is characterised in that, by making magnetic circuit one, luminance deviation (lamp current) can be prevented, even if unevenness in stray capacity of load exists, thus eliminating luminance unevenness on screen, when used as a backlight arranged on the back side of pannel. COPYRIGHT: (C)2005,JPO&NCIPI |
