Patent ID: 8890777
Filing Date: 2014-11-18
Classification: G09G

Abstract:
1. An organic light emitting display, comprising: a scan driver adapted to drive scan lines; a data driver adapted to drive data lines; pixels positioned between the scan lines and the data lines, each of the pixels including an organic light emitting diode (OLED) and a driving transistor, the driving transistor to control an amount of current that flows from a first power source to a second power source at a low level via the OLED; an initial power source unit adapted to supply a first voltage different from the voltage of the first power source, the first voltage being a voltage, which when supplied to the driving transistors, turns the driving transistors on; a switching unit between the data driver and the data lines, the switching unit being adapted to selectively couple the initial power source unit and the data driver to the data lines, the switching unit to couple the first voltage to the data lines during a sensing period and to couple the data driver to the data lines during a driving period; a timing controller adapted to transmit externally supplied first data to the data driver; and a compensating unit adapted to compensate for variations in threshold voltages of the driving transistors of the pixels, wherein for each pixel: the compensating unit is to determine the threshold voltage of the driving transistor based on a voltage received from the data line of the pixel during the sensing period, and to store second data corresponding to a threshold voltage of the driving transistor and to transmit the stored second data to the data driver, and wherein the timing controller is adapted to control the scan driver, the data driver, and the compensating unit, and the data driver is adapted to generate a third data signal supplied to the pixels using the first data and the second data.