Patent ID: 7019721

Claim:
Organic light-emitting diode drive circuit for a display application, said display comprising a plurality of organic light-emitting diodes (OLEDs) ( 120 ) having an anode and a cathode, said organic light-emitting diodes (OLEDs) ( 120 ) being connected to anode lines ( 1 - 2 - 3 ) and cathode lines ( 4 - 5 - 6 ), and at least one drive circuit ( 200 - 300 ), characterized in that the organic light-emitting diodes are arranged in a common anode configuration, whereas said drive circuit ( 200 - 300 ) is configured as a common anode drive device, wherein each said cathode line by means of a respective first switch ( 220 a - 220 b - 220 c ) is arranged to be connected to a current source ( 150 a - 150 b - 150 c ) and wherein each said anode line by means of a respective second switch ( 210 a - 210 b - 210 c ) is arranged to be connected to a positive power supply; and in that the respective first switches ( 220 a - 220 b - 220 c ) are configured such that, when a cathode line is in use, a direct connection is made between the cathodes of the organic light emitting diodes (OLEDs) ( 120 ) in use and the respective current source ( 150 a - 150 b - 150 c ) and, when said cathode line is unused, each of the cathodes of the unused organic light emitting diodes (OLEDs) ( 120 ) is directly connected to a positive power supply.