Array of light emitting diodes
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Issued Date -
Oct 5, 2006
app pub date -
Apr 5, 2005
filing date -
Apr 5, 2005
priority date (Note) -
Abandoned
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Abstract
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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