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A Driving Method for Improving Luminous efficacy of a Light Emitting Diode

Summary

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.

Supplementary Information

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

Industry

Optics

Sub Group

LED/OLED

Others

LOO Ka-hong
LUN Wai-keung
LAI Yuk-ming
TAN Siew-chong
TSE Chi-kong, Michael

Country/Region

USA

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