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公开(公告)号：EP2845443A1
公开(公告)日：2015-03-11
申请号：EP13724342.4
申请日：2013-04-29
发明人： HALL, Simon Richard Geoffrey , CRUTCHLEY, Benjamin, G. , PRINS, Andrew, D. , SWEENEY, Stephen, J. , LOCK, Darren
CPC分类号： H05B33/0866 , H01L25/167 , H01L2924/0002 , H05B33/0848 , H05B33/089 , H01L2924/00
摘要： An LED assembly (50) includes a plurality of LEDs including a first LED (52, 56, 60) of a first colour and a second LED (54, 58, 62) of a second colour. The assembly also includes a driver(53). The driver (53) includes a monitor (55) for monitoring a response of an LED, the absorption spectrum of which at least partially overlaps the emission spectrum of the first LED,and thereby obtaining an indication of the light output of the first LED. The assembly also includes a current supply (57). The driver(53)is configured to control the current supply to supply current to at least one LED of the plurality of LEDs in dependence upon the indication of the light output of the first LED whereby to maintain a desired colour mix of output light from the LED assembly(50).
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公开(公告)号：EP2845226A1
公开(公告)日：2015-03-11
申请号：EP13724341.6
申请日：2013-04-29
发明人： HALL, Simon Richard Geoffrey , CRUTCHLEY, Benjamin, G. , LOCK, Darren, Dr. , PRINS, Andrew, D., Dr. , SWEENEY, Stephen, J.
CPC分类号： H05B33/089 , H01L25/167 , H01L2924/0002 , H05B33/0842 , H05B33/0866 , H01L2924/00
摘要： A method of measuring the efficiency of an LED (10) includes illuminating the LED with light and measuring a response of the LED (10) to the absorption of light in order to measure the quantum efficiency of the LED(10). The spectrum of the light at least partially overlaps the absorption spectrum of the LED. An LED assembly (40) includes first (42) and second (44) LEDs, and a driver(43). An absorption spectrum of the first LED at least partially overlaps an emission spectrum of the second LED. The driver includes a monitor(45)for monitoring a response of the first LED to the absorption of light emitted by the second LED; a current supply (47) for supplying current to the first LED;and a switch (49) for switching between (a) operating the first LED in an absorbing mode and the second LED in an emitting mode, and (b) operating the first LED in an emitting mode.
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