LED driving circuit
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United States of America Patent
Stats
-
Dec 4, 2012
Grant Date -
Mar 25, 2010
app pub date -
Oct 17, 2007
filing date -
Oct 18, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An LED driving circuit is provided for making it possible to economically drive a serially connected LED circuit by means of a switching device with a relatively low withstanding voltage even if the number of serially connected LED devices increases. In an LED driving circuit provided with a serially connected LED circuit (11) in which many LED devices are serially connected and a switching device (13) serially connected with the serially connected LED circuit (11) to control that an electrical current flowing through the serially connected LED circuit (11) is turned on or off, wherein a circuit device (15), which comprises a resistor, a constant voltage diode, a constant current diode, or the like, is connected in parallel with the switching device to make a minute current flow through the serially connected LED circuit (11) to the extent that the LED devices are not turned on when the switching device is turned off.
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