Patent ID: 7728798
Filing Date: 2010-06-01
Classification: G09G,H04N,H05B,Y02B

Abstract:
1. An LED driver for driving a plurality of light emitting diodes (LEDs), used as light sources corresponding to red, green and blue (RGB), comprising: a current controller to control a power supply of a predetermined power source unit to make a current flowing in the plurality of LEDs reach a predetermined target current value which value sequentially changes corresponding to an emitting order of the RGB LEDs; a plurality of divergence switches to prevent or permit current to flow through each of the plurality of LEDs; a bypass switch being connected parallel to the plurality of divergence switches and the plurality of LEDs to bypass the current supplied to the plurality of LEDs by being closed; and a switch controller to sequentially open and close the plurality of divergence switches corresponding to a change of the target current value and control the bypass switch to be short-circuited during a predetermined interval corresponding to the rise of the predetermined target current value, wherein the switch controller opens the bypass switch when the current flowing in the bypass switch reaches the target current value.