LED matrix manager

摘要

Circuits for controlling a plurality of LEDs connected in series are disclosed herein. The circuit includes a plurality of switches, wherein each switch is connectable between the anode and cathode of one of the plurality of LEDs. Each of the switches has a first state wherein current does not pass through the switch and a second state wherein current passes through the switch. The circuit also includes an input for receiving data to program the switches and a data line for transferring data between a circuit controlling second LEDs that are connected in parallel with the first LEDs and the circuit. In addition, the circuit includes a data output for transferring data to other circuits controlling third LEDs that are connected in series with the first LEDs.

主权项

1. A circuit for controlling a plurality of first LEDs connected in series, the circuit comprising:
a plurality of switches, wherein each switch is connectable between an anode and a cathode of one of the plurality of first LEDs, each of the switches having a first state wherein current does not pass through the switch and a second state wherein current passes through the switch; a first data input for receiving data to program the switches; a data line for transferring data between a circuit controlling second LEDs that are connected in parallel with the first LEDs and the circuit; a data output for transferring data to other circuits controlling third LEDs that are connected in series with the first LEDs, wherein the data for controlling the switches is in pulse width modulation format and wherein the circuit further comprises a data sorter, wherein the data sorter sorts the pulse width modulated signals based on their on time; and further comprising a charge pump, wherein the charge pump converts the voltage supplied to at least one of the first LEDs to the voltage required to operate the circuit for controlling the first LEDs, wherein a Zener diode is placed in series with the voltage supplied to at least one of the first LEDs, a voltage across the Zener diode being input to the charge pump to generate an operating voltage for the circuit for controlling the first LEDs.