| 摘要 |
A device for driving light emitting diode (LED) string, including a DC(direct current)-to-DC converter, a LED string, a switch and a feedback circuit. The DC-to-DC converter includes a first DC-to-DC converter end for outputting a DC voltage according to a feedback signal. The LED string is coupled to the first DC-to-DC converter end. The switch is coupled to the LED string. When the switch is turned on, the LED string is driven by the DC voltage, and then a DC current is flowed through the LED string. The feedback circuit outputs the feedback signal according to the DC current. When the switch is turned on, the LED string is quickly turned on to a predetermined brightness. When the switch is turned off, the LED string is quickly turned off.
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