Patent ID: 7423617

Claim:
A method for sensing a light emissive element ( 25 ) in an active matrix display pixel cell ( 20 ; 20 ′), further comprising a data line ( 21 ) connectable to a drive element ( 24 ) and to a first electrode ( 29 ) of the emissive element ( 25 ), said method comprising: during repeated output periods, connecting the data line ( 21 ) to the drive element ( 24 ), and providing on the data line ( 21 ) a drive signal (V) to cause the emissive element ( 25 ) to generate light, and during a sensing period, between two output periods, connecting the data line ( 21 ) to the first electrode ( 29 ) of the emissive element ( 25 ), providing on the data line ( 21 ) a sensing voltage (V 1 ) to reverse bias the emissive element ( 25 ), and detecting any leakage current (IL) flowing through the emissive element ( 25 ).