Apparatus and method for driving backlight
AssigneeLG.Philips LCD Co., Ltd.
InventorTae Lee
Life of this patent
Estimating the term…
Abstract
The apparatus for driving a backlight includes a plurality of lamps each of which has first and second electrodes, a transformer for receiving an AC waveform to provide high voltage AC waveform to drive the plurality of lamps, a detection circuit for generating a detection voltage corresponding to the high voltage AC waveform, an accumulation operation unit for accumulating the detection voltage from the detection circuit and generating a shutdown signal voltage, and a controller for receiving an input voltage to provide the AC waveform to the transformer and for receiving the shutdown signal voltage to shutdown the plurality of lamps in response to a shutdown signal.
Claims18
An apparatus for driving a backlight comprising:
- a plurality of lamps each of which has first and second electrodes;
- a transformer for receiving an AC waveform to provide high voltage AC waveform to drive the plurality of lamps;
- a detection circuit for generating a detection voltage corresponding to the high voltage AC waveform;
- an accumulation operation unit for accumulating the detection voltage from the detection circuit and generating a shutdown signal voltage;
- and
- a controller for receiving an input voltage to provide the AC waveform to the transformer and for receiving the shutdown signal voltage to shutdown the plurality of lamps in response to a shutdown signal.
A method for driving a backlight including a plurality of lamps each of which has first and second electrodes, comprising:
- converting an input voltage to an AC waveform;
- converting the AC waveform to a high voltage AC waveform using a transformer and providing the high voltage AC waveform to drive the plurality of lamps;
- generating a detection voltage corresponding to the high voltage AC waveform output from the transformer to the plurality of lamps;
- and
- accumulating the detection voltage during each clock signal and generating a shutdown signal voltage using the accumulated detection voltage.
An apparatus for driving a backlight comprising:
- a plurality of lamps each of which has first and second electrodes;
- a transformer for receiving an AC waveform to provide high voltage AC waveform to drive the plurality of lamps;
- a clock for providing a clock signal;
- a detection circuit for generating a detection voltage corresponding to the high voltage AC waveform;
- an accumulation operation unit for receiving the detection voltage from the detection circuit each clock signal and generating a shutdown signal voltage during each clock signal;
- and
- a controller for receiving an input voltage to provide the AC waveform to the transformer and for receiving the shutdown signal voltage during each clock signal.
Dependencies are inferred from the claim text.