Patent ID: 9351368
Filing Date: 2016-05-24
CPC Classification: G09G,H05B

Claim Text:
1. A method of determining the current effective voltage V OLED of a light-emitting device in a selected pixel in an array of pixels in a display in which each pixel includes a drive transistor for supplying current to said light-emitting device, said method comprising supplying a programming voltage to said drive transistor in said selected pixel to supply a first current to said light-emitting device in said selected pixel, said first current being independent of the effective voltage V measuring said first current, supplying a second programming voltage to said drive transistor in said selected pixel to supply a second current to said light-emitting device in said selected pixel, said second current being a function of the current effective voltage V measuring said second current and comparing said first and second current measurements, adjusting said second programming voltage to make said second current substantially the same as said first current, extracting the value of the current effective voltage V