TFT Device And Method For Sensing Threshold Voltage Of Driving TFT included in Organic Light Emitting Display

摘要

The present invention relates to a threshold voltage sensing device and a sensing method of a driving TFT provided in an organic light emitting display device that reduces the sensing time so that a change in the threshold voltage of the driving TFT can be sensed during real-time driving. The present invention obtains the first and second sensing voltage values through high-speed sensing in the TFT linear section, and derives the threshold voltage change value of the driving TFT based on the sensing ratio value between the sensing voltages. A series of processes for , that is, programming, source node initialization, sensing and sampling, etc. can be performed in the vertical blank period. That is, according to the present invention, it is possible to sense the threshold voltage change of the driving TFT (DT) during real-time driving without separately providing a predetermined time during the power-on process or a predetermined time during the power-off process to sense the threshold voltage change. , the compensation performance can be improved.