Patent ID: 7471287
Filing Date: 2008-12-30
Classification: H05B,Y02B

Abstract:
1. A light source driving circuit, suitable for driving a first light emitting component, the circuit comprising: a power supply circuit, having an output terminal and a feedback terminal, wherein the output terminal is coupled to one terminal of the first light emitting component for supplying a power supply voltage to the first light emitting component and determining the value of the power supply voltage according to a feedback signal received by the feedback terminal; a first dimming circuit, having a first terminal coupled to another terminal of the first light emitting component and a second terminal coupled to a common level, wherein the first dimming circuit determines the on/off states of the first terminal and the second terminal thereof according to the logic states of a pulse width signal; and a feedback circuit, coupled between the first terminal of the first dimming circuit and the feedback terminal of the power supply circuit, for determining the feedback signal according to the on/off state of the first dimming circuit, wherein the feedback circuit comprises: