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Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/4849

Title: Driving method for improving luminous efficacy of a light emitting diode
Authors: Loo, Ka-hong
Lun, Wai Keung
Lai, Yuk Ming
Tan, Siew-chong
Tse, C. K. Michael
Issue Date: 10-Jan-2012
Citation: US Patent 8,093,821 B2. Washington, DC: US Patent and Trademark Office, 2012.
Abstract: A driving method for improving luminous efficacy of a light emitting diode (LED), the method comprising: periodically switching a DC current supplied to the LED between a high current level l [sub H] and a low current level l [sub L], the low current level l [sub L] being fixed at zero or raised above zero to produce a DC offset; and maintaining an average current at a first value I [sub f] by adjusting the duty cycle acting on the high current level l [sub H] and any one from the grouping consisting of: adjusting the high current level l [sub H] and adjusting the low current level l [sub L], and adjusting the high current level l [sub H] or adjusting the low current level l [sub L].
Rights: Assignee: The Hong Kong Polytechnic University.
Type: Patent
URI: http://hdl.handle.net/10397/4849
Appears in Collections:EIE Patents

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