Patent ID: 8633873

Claim:
A calibration circuit for calibrating current-biased, voltage-programmed circuits that are used to program pixels of a display panel, the display panel having an active area having a plurality of light emitting devices arranged on a substrate, and a peripheral area separate from the active area, the calibration circuit comprising: a first row of calibration current source or sink circuits, each of the calibration current source or sink circuits of the first row providing a bias current to a bias current line for a corresponding column of current-biased, voltage-programmed (CBVP) pixel circuits in the active area of the display panel, wherein the bias current line is coupled via one or more switches to a first terminal of a storage device in corresponding ones of the CBVP pixel circuits and a voltage data line configured to couple voltage programming data to a second terminal of the storage device; a second row of calibration current source or sink circuits, each of the calibration current source or sink circuits of the second row providing the bias current to the bias current line for the corresponding column of CBVP pixel circuits; a first calibration control line configured to cause the first row of calibration current source or sink circuits to calibrate the display panel with a bias current while the second row of calibration current source or sink circuits is being calibrated by a reference current generated by a reference current source and carried from the reference current source to the second row of calibration current source or sink circuits on a current line; and a second calibration control line configured to cause the second row of calibration current source or sink circuits to calibrate the display panel with the bias current while the first row of calibration current source or sink circuits is being calibrated by the reference current generated by the reference current source and carried on the current line, wherein each of the CBVP pixel circuits is programmed during a programming operation by a corresponding programming voltage stored in each of the CBVP pixel circuits.