Array of light emitting diodes

(19)

(11)

EP 1 583 399 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	04.10.2006 Bulletin 2006/40

(43)	Date of publication A2:
	05.10.2005 Bulletin 2005/40

(21)	Application number: 05251845.3

(22)	Date of filing: 24.03.2005

(51)

International Patent Classification (IPC):

H05B 33/08^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR LV MK YU

(30)

Priority:

03.04.2004 GB 0407574

(71)	Applicant: Oxley Developments Company Limited
	Ulverston Cumbria LA12 9QG (GB)

(72)	Inventor:
	Latham, Brian Christopher Witherslack, LA11 6RW (GB)

(74)	Representative: W.P. Thompson & Co.
	Coopers Building Church Street Liverpool L1 3AB Liverpool L1 3AB (GB)

(54)	Array of light emitting diodes

(57) The invention concerns LED arrays of the type in which one or more "strings" of LEDs such as 6 are series connected across a potential difference as at 8, 10. To compensate for changes in forward voltage of individual LEDs 4, and/or for supply voltage variations, a switching means (which may be formed as a transistor T2, T3) is provided for selectively removing one or more LEDs from the strings. This can for example be done by selectively shorting the chosen LEDs.

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