Patent ID: 7633577

Claim:
A light emitting diode (LED) backlight unit comprising: a first printed circuit board, wherein the first printed circuit board is constructed as an metal core printed circuit board (MCPCB) in which an aluminum layer is laminated at a lower surface; a plurality of light emitting diodes (LEDs) mounted on the first printed circuit board; a second printed circuit board operatively coupled with the first printed circuit board with a connector, the second printed circuit board having a plurality of drive components mounted thereon for driving the light emitting diodes; and a control unit mounted on a third printed circuit board to output a signal which controls the plurality of drive components, wherein the third printed circuit board is electrically connected with the second printed circuit board, wherein the control unit transmits a pulse width modulation (PWM) signal for controlling the LEDs to the drive components to thereby duty control electric currents of the LEDs, and wherein the control unit supplies different signals and individually controlled currents to each of the LEDs, thereby controlling brightness respectively.