| 主权项 |
1. A light emitting device driver chip for driving a light emitting device circuit, wherein the light emitting device circuit includes a plurality of light emitting devices connected in series and the light emitting device circuit is for receiving a rectified input voltage, the light emitting device driver chip comprising:
a plurality of pins, each of which is electrically connected to a corresponding one or ones of the light emitting devices, respectively, wherein an internal voltage is provided through a predetermined one (predetermined pin) of the pins; a voltage regulation circuit electrically connected to the predetermined pin, for receiving the internal voltage so as to provide an operation voltage, wherein the operation voltage is a power source required for an operation of an internal circuit of the light emitting device driver chip; a switch circuit including a plurality of switch groups, wherein each of the switch groups is electrically connected to a corresponding one of the pins, respectively; a current source circuit electrically connected to the switch circuit, for providing a light emitting device current to at least one light emitting device which is turned ON; and a switch control circuit electrically connected to the switch circuit, for generating an operation signal to control at least one of the switch groups of the switch circuit, so as to determined which light emitting device is turned ON; wherein the light emitting device driver chip does not directly receive the rectified input voltage. |
