H - Electricity – 03 – L
Patent
H - Electricity
03
L
315/27, 375/40,
H03L 1/00 (2006.01) G05F 3/24 (2006.01) G09G 3/14 (2006.01) H03K 3/42 (2006.01)
Patent
CA 1042521
SELF-REGULATING DRIVING CIRCUIT FOR LIGHT-EMITTING DIODES ABSTRACT A self-regulating circuit is disclosed for driving a load, such as an arithmetical calculator display using light-emitting diodes, directly from a single MOS calculator chip. A strobe driver, which may be a field effect transistor switch, has its gate electrode connected to a regulated supply of dc voltage, its drain electrode connected to a supply of voltage subject to variation, and its source electrode connected at a common point to one terminal of each of the light-emitting diodes of the display in order that the light-emitting diodes may be driven thereby. A second field effect transistor switch is also provided and has the conduction path thereof connected between the other terminal of a respective light-emitting diode and a reference potential, e.g. ground, to selectively complete a current path including the respective light-emitting diode. Hence, a light-emitting diode may be illuminated at a particular time and according to a predetermined order as controlled by the application of signals at the gate electrode of the second field effect transistor switch.
235645
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