Control circuit for light emitting diode arrangements
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United States of America Patent
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Jan 7, 2014
Grant Date -
Aug 30, 2012
app pub date -
Feb 14, 2012
filing date -
Feb 28, 2011
priority date (Note) -
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Abstract
A control circuit (1) for light emitting diode arrangements (11), used particularly for backlighting LC flat screens. The circuit has a plurality of control channels (5, 5′) in each of which one or more light emitting diode arrangements (11) are disposed. The circuit has a balancing device (23) which allows currents in the individual control channels (5, 5′) to be balanced. Each control channel (5, 5′) has a separate dimming device (13) through which a brightness of the light emitting diode arrangements (11) in this control channel (5, 5′) can be changed separately from the other control channels (5, 5′). For this purpose, the control circuit has a compensation device (16) which allows a flow of current in the individual control channels (5, 5′) to be balanced when the light emitting diodes have different brightnesses.
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