Patent ID: 7145529

Claim:
A method for color correction in an organic electroluminescent device ( 1 ) having at least one pixel ( 6 ) comprising an electroluminescent material layer ( 5 ), which is sandwiched between a first and a second electrode ( 2 , 3 ), the pixel constituting a first and a second light-emitting element ( 6 R, 6 G), wherein said method comprises the steps of: inputting a data signal (S) comprising information to be displayed by said light-emitting elements ( 6 R, 6 G), generating a correction factor for each light-emitting element ( 6 R, 6 G), said correction factors being based on: (i) a measured shift in a voltage (V) across a light-emitting element ( 6 R, 6 G) at a predetermined current (I s ) through said light-emitting element, and a relation between the measured shift in the voltage and a color point wavelength shift Δλ of said light-emitting element, or (ii) a measured shift in a current (I) through a light-emitting element ( 6 R, 6 G) at a predetermined voltage (V s ) across said light-emitting element, and a relation between the measured shift in the current and a color point wavelength shift Δλ of said light-emitting element, applying said correction factor to said data signal (S); and supplying the corrected data signal (S) to the light-emitting elements ( 6 R, 6 G).