DRIVING CIRCUIT AND METHOD OF LIGHT EMITTING DIODE
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United States of America Patent
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Issued Date -
May 12, 2011
app pub date -
Nov 12, 2009
filing date -
Nov 12, 2009
priority date (Note) -
Abandoned
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Abstract
A driving circuit and a driving method of an light emitting diode (LED) are provided. The driving circuit includes a current source, a voltage source, a voltage detecting unit, a memory unit, and a control unit. The voltage detecting unit detects a present voltage value of the LED. The memory unit records a previous voltage value of the LED. The control unit controls the voltage source to provide a pre-charge voltage to the LED in a driving period, and to cease providing the pre-charge voltage when the present voltage value is no longer less than the previous voltage value. The voltage level of the pre-charge voltage is determined by the previous voltage value. The control unit controls the current source to provide a driving current to the LED in the driving period.
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