| 摘要 |
A black insertion dimming PWM generation portion ( 32 ) outputs a black insertion PWM pulse VBL to drive a fluorescent lamp ( 43 ) in such a manner that a black insertion period during which the fluorescent lamp ( 43 ) is lit OFF and a light-ON period during which the fluorescent lamp ( 43 ) is lit ON are provided within one vertical period. A luminance dimming PWM generation portion ( 31 ) outputs a dimming PWM pulse Vpwm 1 to PWM-drive the fluorescent lamp ( 43 ) so as to be lit ON and lit OFF repetitively during the light-ON period. An AND circuit ( 33 ) outputs an inverter driving signal Vout 1 generated by superimposing the dimming PWM pulse Vpwm 1 and the black insertion PWM pulse VBL. An inverter ( 42 ) drives the fluorescent lamp ( 43 ) by applying a voltage corresponding to the inverter driving signal Vout 1 to the fluorescent lamp ( 43 ).
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