Patent ID: 9070326
Filing Date: 2015-06-30
Classification: G09G,H02M,H05B

Abstract:
1. A backlight unit, comprising: an LED array having a plurality of LEDs; a voltage generating unit for generating a driving voltage to drive the plurality of LEDs in response to a switching signal; an amplifying unit for feeding the driving voltage back and amplifying the fed back driving voltage, to output an amplification signal; a stabilizer for stabilizing the amplification signal; a comparator for comparing the amplification signal with a reference waveform to apply the switching signal to the voltage generating unit; a first switching unit for switching a current of the LED array in response to a PWM dimming signal from a timing controller; and a second switching unit for switching the switching signal from the comparator in response to the PWM dimming signal, wherein the amplifying unit distributes the driving voltage according to a resistance ratio of a first resistor and a second resistor of the amplifying unit to amplify the fed back driving voltage supplied to a differential amplifier of the amplifying unit.