US Patent 9601052 Pixel circuit of organic light-emitting display

A pixel of an OLED display is disclosed. A gate voltage of a driving transistor can be precisely adjusted using a second gate electrode that can supply DC power easily securing an operation range of an OLED. Further, by only adding one power line that can precisely adjust a gate voltage of a driving transistor to an OLED display, an operation range of the OLED can be easily secured and thus a drain current can be reduced without increasing a channel length of the driving transistor resulting in a narrower pixel area. According to various embodiments, the pixel can secure an operation range of the OLED by reducing a magnitude of a drain current by adjusting a gate voltage of a driving transistor.