Patent ID: 7924249

Claim:
A display system comprising: multiple pixels arranged in a matrix of rows and columns, each of said pixels having a light emitting device, a drive transistor for driving the light emitting device, and a switch transistor for selecting the pixel; and a power supply line for each of said multiple rows of pixels and coupled to said drive transistor in each of said pixels, multiple select lines for selecting said rows of said pixels in said matrix, multiple data lines for supplying calibration voltages and display data to said columns of pixels in said matrix, a current source for supplying current to the drive transistor of a selected pixel via said power supply line or one of said data lines so that said drive transistor functions as a voltage amplifier to produce an amplified voltage that corresponds to a characteristic of said selected pixel that varies with the age of that pixel, said amplified voltage amplifying any shift in said characteristic of said selected pixel, and circuitry for detecting said amplified voltage and using that detected amplified voltage to determine an adjustment of the calibration voltage for said selected pixel.