PULSE CONTROLLED LIGHT EMITTING DIODE DRIVER

摘要

To avoid clock signals and to separate power wiring from control wiring in a driver, and to avoid three-terminal light emitting diodes with control electrodes, a driver for driving light emitting diode circuits (10, 20, 30) is provided with first and second terminals (1, 2) for receiving a voltage signal from a source (5) and with a first switching circuit (11, 2) coupled to the second terminal (2) and to a third terminal (3). The first and the third 5 terminal (1, 3) are to be coupled to electrodes of a first light emitting diode circuit (10). The first switching circuit (11, 12) comprises a first switch (11) and a first timing circuit (12) for, in response to a first pulse signal as added to the voltage signal, activating the first switch (11) to switch on the first light emitting diode circuit (10). Sequential pulse signals may be used to sequentially switch on light emitting diode circuits (10, 20).

主权项

1. A driver for driving light emitting diode circuits, comprising
first and second terminals for receiving a voltage signal from a source, and a first switching circuit coupled to the second terminal and to a third terminal, the first and the third terminal being arranged to be coupled to electrodes of a first light emitting diode circuit, and the first switching circuit comprising a first switch and a first timing circuit for, in response to a first pulse signal added to the voltage signal, activating the first switch, the first switch, when activated, being in a conductive mode and then staying in that conductive mode independently of the first pulse signal.