Disclosed is an Organic Light Emitting Diode (OLED) display including pixels and a shift register for driving transistors arranged in the pixels. The pixels include a first group of pixels disposed on a first row, and a second group of pixels disposed on a second row. The shift register applies a first scan signal to the first group of pixels and the second group of pixels simultaneously. In addition, the shift register applies a second scan signal to the first group of pixels and the second group of pixels sequentially.