| 摘要 |
An“LED”driving circuit comprises an“LED”driving voltage generator which generates an“LED”driving voltage, a pulse width modulation (“PWM”) control unit which outputs a“PWM”signal having a predetermined duty ratio, and a main switching unit which controls the driving voltage applied to the“LEDs”in accordance with the“PWM”signal. Further, the“PWM”control unit comprises a controller including an error amplifier which detects an error between a reference voltage and a driving voltage and amplifies the detected error, an oscillator which outputs a pulse signal having a predetermined oscillation frequency, and a comparator which compares the pulse signal output from the oscillator with an output voltage from the error amplifier to generate a“PWM”signal; and a high frequency damper connected to the main switching unit to prevent malfunction of the controller due to noise. A backlight unit and liquid crystal display incorporate the“LED”driving circuit. |
