Patent ID: 7304633
Filing Date: 2007-12-04
Classification: H05B

Abstract:
1. An inverter device for a liquid crystal display, comprising: a transformer for receiving an inverter drive voltage, converting the received drive voltage into an AC lamp drive voltage and supplying the AC lamp drive voltage to a high path of one of a plurality of backlight lamps; a low path switching part connecting or disconnecting a low paths of the backlight lamps with a ground voltage source in response to an external inverter ON/OFF signal, wherein the low path switching part includes a first driver selectively supplying the inverter drive voltage to the low paths of the backlight lamps in response to the inverter ON/OFF signal, and a first switching part connecting the low paths of the backlight lamps to the ground voltage source in response to an output signal of the first driver; and a shutdown circuit for receiving a voltage input through the low paths of the backlight lamps to monitor for a malfunction of the backlight lamps in response to an external shutdown ON/OFF signal, wherein the first driver includes a first switch being switched in response to the inverter ON/OFF signal, and a second switch supplying the inverter drive voltage to the first switching part in response to a state of the first switch, wherein the first switching part includes first and second transistors connected in series between the low path of the backlight lamp and the ground voltage source for connecting the low path of the backlight lamp to the ground voltage source in response to an output signal of the second switch, and a resistor connected between the low path of the backlight lamp and the first transistor.