According to the present invention, in a liquid crystal display device which intermittently drives (burst driving) a light source device having a discharge tube which is arranged to face a main surface of a liquid crystal display panel in an opposed manner and is turned on in response to an alternating electric field, the resistance between first and second active elements which constitute a resonance circuit at a primary side of a driving circuit of the light source device and the reference potential in the driving circuit is set higher when burst driving of the discharge tube assumes the turn-OFF state than when the burst driving of the discharge tube assumes the turn-ON state. Due to such a constitution, it is possible to lower the luminance when the burst driving is in the turn-OFF state than when the burst driving is in the turn-ON state without extinguishing the discharge tube when the burst driving is off whereby it is possible to suppress blurring of motion pictures whereby blurring of the motion picture can be suppressed and luminance of the image can be increased.