Organic light emitting diode display device capable of compensating a threshold voltage of a driving TFT

摘要

This embodiments herein relate to an organic light emitting diode display device comprising: a display panel configured to include a plurality of pixels disposed in a matrix form, wherein each of the pixels including: a driving TFT, an organic light emitting diode, a control circuit including first to fourth TFTs, capacitors. The embodiments described herein may improve accuracy of sensing a threshold voltage of the driving TFT even though the organic light emitting diode display device drives high frequency such as 240 Hz because sensing periods are long enough to sense the threshold voltage of the driving TFT. Also, the embodiments described herein may compensate a drop of a high potential voltage due to compensating the current between a drain electrode and a source electrode of the driving TFT by using the high potential voltage dropped.

主权项

1. An organic light emitting diode display device comprising:
a display panel configured to include data lines, first scan lines, second scan lines, control lines, emission lines, and a plurality of pixels disposed in a matrix form, each of the pixels including:
a driving TFT configured to have a gate electrode coupled to a first node and a source electrode coupled to a second node;an organic light emitting diode configured to have an anode electrode a drain electrode of the driving TFT and a cathode electrode coupled to a first level voltage supply source supplying a first level voltage;a first TFT configured to supply a data voltage of the data line to the first node in response to a first scan signal of the first scan line;a second TFT configured to supply a reference voltage to the first node in response to a second scan signal of the second scan line;a third TFT configured to supply a second level voltage higher than the first level voltage to the second node in response to an emission signal of the emission line;a fourth TFT configured to couple the second node to a third node in response to a control signal of the control line;a first capacitor coupled between the first node and the third node; anda second capacitor coupled between the third node and a second voltage supply source supplying the second level voltage, wherein the control signal is inverted to a second logic level voltage from a first logic level voltage after the emission signal is inverted to the second logic level voltage from the first logic level voltage during a fourth period for emitting the organic light emitting diode.