Patent ID: 9224337
Filing Date: 2015-12-29
Classification: G09G

Abstract:
1. An organic light emitting diode display device comprising a plurality of pixels arranged in a matrix form, each of the pixels comprising: a driving thin film transistor (TFT) including a gate electrode coupled to a first node, a source electrode coupled to a second node, and a drain electrode coupled to a high-potential voltage line; an organic light emitting diode between the second node and a low-potential voltage line; a first TFT configured to connect a data line to the first node during a data voltage supply period of a frame period; an initialization control circuit coupled between the first node and a first reference voltage line supplying a first reference voltage, the initialization control circuit further connected to a second node, a third node and a second reference voltage line supplying a second reference voltage, the initialization control circuit configured to initialize the first node to the first reference voltage, and the second and third nodes to a second reference voltage during an initialization period of the frame period preceding the data voltage supply period, and configured to initialize the second and third nodes to a second reference voltage during the initialization period; and a first capacitor coupled between the first node and the third node, the first capacitor configured to store a voltage difference between the first node and the third node during the initialization period, and change a voltage level of the first node based on a voltage level of the third node in a threshold voltage sensing period between the initialization period and the data voltage supply period, wherein the initialization control circuit includes: a second TFT including gate electrode coupled to an emission line, a source electrode coupled to the third node, and a drain electrode coupled to the second node; a third TFT including a gate electrode coupled to an initialization line for carrying an initialization signal to indicate the initialization period, a source electrode coupled to the first reference voltage, and a drain coupled to the first node; a fourth TFT including a gate electrode coupled to the initialization line, a source electrode coupled to the second reference voltage line, and a drain electrode coupled to the second node or third node, the third TFT and fourth TFT receiving the initialization signal simultaneously.