Light source driving circuit for driving light emitting...

Details Light source driving circuit for driving light emitting... Light source driving circuit for driving light emitting...

2006-12-29

2008-12-30

Vo, Tuyet (Department: 2821)

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

C345S102000, C345S211000, C345S204000, C345S082000, C315S291000, C315S308000, C315S312000, C315S360000

Reexamination Certificate

active

07471287

ABSTRACT:
A light source driving circuit is adapted for driving a light-emitted component. The light source driving circuit includes a power supply, a dimming circuit, and a feedback circuit. An output terminal of the power supply is coupled to one terminal of the light-emitted component to supply a power to the light-emitted component, and determine the power value according to a feedback signal received by a feedback terminal of the power supply. A first terminal of the dimming circuit is coupled to another terminal of the light-emitted component. A second terminal of the dimming circuit is coupled to a common voltage. According to a logic state of a pulse width signal, the dimming circuit determines the conduction of the first terminal and the second terminal. The feedback circuit is coupled between the first terminal and the feedback terminal, and determines the feedback signal according to on/off state of the dimming circuit.

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