Patent ID: 8310167

Claim:
A control arrangement for controlling light emitting diodes ( 1 ) (LEDs) which are combined to a display board ( 4 ), said control arrangement comprising: at least one driver ( 2 ) connected to a voltage source ( 3 ) and having current outputs ( 2 A) via which current can be supplied to the LEDs ( 1 ) as well as at least one control input ( 2 E) by way of which the current which can be supplied to the LEDs ( 1 ) is controllable, and a counter element ( 28 ) for determining the number of LEDs ( 1 ) which are to be supplied with current at the same time, said counter element ( 28 ) being connected via a control unit ( 29 ) to the at least one control input ( 2 E) for supplying to the at least one driver ( 2 ) a signal which is indicative of the number of LEDs determined by the counter element ( 28 ) as being energized for limiting the current supplied to the LEDs depending on the number of LEDs being energized so as to avoid exceeding the maximally admissible output capacity of the voltage source.