Abstract: A circuit for driving a light emitting diode (LED) comprises a plurality of current supply level circuits wherein each current supply level circuit is configured to control a different amount of electric current flowing through the LED. Each current supply level circuit includes a circuit enable transistor, a drive current transistor, and a gain control transistor. The circuit enable transistor is configured to enable current flow through the current supply level circuit. The drive current transistor is configured to control an amount of electric current flowing through the current supply level circuit. The gain control transistor is configured to control a range of the amount of electric current flowing through the current supply level circuit.

Abstract: A circuit for driving a light emitting diode (LED) comprises a plurality of current supply level circuits wherein each current supply level circuit is configured to control a different amount of electric current flowing through the LED. Each current supply level circuit includes a circuit enable transistor, a drive current transistor, and a gain control transistor. The circuit enable transistor is configured to enable current flow through the current supply level circuit. The drive current transistor is configured to control an amount of electric current flowing through the current supply level circuit. The gain control transistor is configured to control a range of the amount of electric current flowing through the current supply level circuit.