Patent ID: 8427512

Claim:
A method of controlling a drive to a pixel of an OLED display having a test pixel and display pixels, the method comprising determining a drive current for the pixel to be controlled by first calculating a value of η/η 0 using: V now test = V now other - 2 ⁢ V 1 ⁡ ( 1 - η η 0 ) where V now test is the voltage drop measured across the test pixel at a test drive current, η 0 is the luminance efficiency of said test pixel at said test drive current at an initial time; V now other is the voltage drop measured across at least one other pixel to be controlled at said test drive current, and V 1 is the end of life voltage increase in said voltage drive for said test drive current; and scaling the drive current to the pixel to be controlled by multiplying the drive current requested by the value η 0 /η.