A Driving Method for Improving Luminous efficacy of a Light Emitting Diode
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 lH and a low current level lL, the low current level lLbeing fixed at zero or raised above zero to produce a DC offset; and maintaining an average current at a first value If by adjusting the duty cycle acting on the high current level lH and any one from the grouping consisting of: adjusting the high current level lH and adjusting the low current level lL, and adjusting the high current level lH or adjusting the low current level lL.
Patent Number: US8093821B2
Application Number: US2009366304A
Inventor: Loo, Ka Hong | Lun, Wai Keung | Lai, Yuk Ming | Tan, Siew Chong | Tse, Chi Kong Michael
Priority Date: 5 Feb 2009
Priority Number: US8093821B2
Application Date: 5 Feb 2009
Publication Date: 10 Jan 2012
IPC Current: H05B003702
US Class: 315209R | 315170
Assignee Applicant: The Hong Kong Polytechnic University
Title: Driving method for improving luminous efficacy of a light emitting diode
Usefulness: Driving method for improving luminous efficacy of a light emitting diode
Summary: Driving method for improving luminous efficacy of LED used in residential, commercial and industrial field.
Novelty: Driving method for improving luminous efficacy of LED for residential field, involves maintaining average current at preset value by adjusting duty cycle on high current level and adjusting high and/or low current level supplied to LED
光学
发光二极管/有机发光二极管
LOO Ka-hong
LUN Wai-keung
LAI Yuk-ming
TAN Siew-chong
TSE Chi-kong, Michael
美国
