Patent ID: 9418593
Filing Date: 2016-08-16
CPC Classification: G09G

Claim Text:
1. An organic light emitting display device, comprising: pixels arranged in an area defined by data lines, scan lines, and control lines, each pixel comprising an organic light emitting diode and a driving transistor, the driving transistor comprising a gate electrode and a drain electrode; a scan driver configured to drive the scan lines; a data driver configured to drive the data lines; a control line driver configured to drive the control lines; and a compensation unit configured to extract threshold voltage information of each driving transistor during a sensing period, wherein: for each period, the compensation unit is configured to supply a preset voltage to the gate electrode such that a first current flows through the driving transistor during the sensing period, and to supply a reference voltage to the drain electrode during the sensing period in which the first current flows; the reference voltage is produced when a second current flows through the organic light emitting diode; the compensation unit is configured to control the voltage value of the preset voltage such that the second current is equal to the first current during the sensing period; and the organic light emitting display device is configured to change bits of data supplied from outside the organic light emitting display device based on the preset voltage at which the second current is equal to the first current.