Patent ID: 8004202
Filing Date: 2011-08-23
Classification: H05B,Y02B

Abstract:
1. An apparatus for driving a backlight, comprising: a controller for providing a pulse signal and a control signal having a first time interval; a FET for converting the pulse signal from the controller; a transformer for boosting the converted pulse signal into a lamp driving signal to drive a lamp; a first means outputting an enabling signal to the controller in response to the lamp driving signal; and a second means for preventing the first means from outputting of the enabling signal during the first time interval, wherein the second means is connected to an output of the transformer to monitor an output voltage of the transformer, wherein the control signal is a square waveform with alternating low and high levels, the control signal has a low level during the first time interval corresponding a startup time of the backlight, wherein the second means responds to the control signal to prevent the first means from supplying the enabling signal to the controller during the startup time of the backlight, when the transformer output voltage is still rising in a range of about 0V to about a predetermined voltage level.