Pixel circuit, display device using the same and manufacturing method thereof

A display device comprising a pixel circuit including a light-emitting diode, wherein:

• the pixel circuit includes a switching transistor connected to a node at which a scan line and a signal line intersect each other;
• a driving transistor which receives a data voltage in the signal line through the switching transistor and converts the data voltage to a current to be supplied to the light-emitting diode;
• and
• a storage capacitor which maintains a voltage applied by the switching transistor, and
• at least one of the driving transistor and the storage capacitor includes a layer formed of a ferroelectric.

A method of manufacturing a display device, comprising:

• preparing a substrate;
• forming a first thin film transistor (TFT), a second TFT, and a storage electrode on the substrate;
• forming a metal bus on the second TFT and the storage electrode, and dividing the metal bus to form a first metal bus and a second metal bus;
• forming a ferroelectric layer on the second metal bus to form a storage capacitor in which the storage electrode serves as one electrode and the ferroelectric layer serves as a dielectric material layer;
• and
• forming a light-emitting element including a light-emitting layer on the first metal bus.