Organic light emitting display and method for making the same

An organic light emitting display comprising:

• a substrate;
• a display region on the substrate, the display region comprising a plurality of pixels;
• and
• a signal transfer unit on the substrate for transferring lighting test signals to the plurality of pixels,
• wherein the signal transfer unit comprises a plurality of transistors for transferring the lighting test signals, and a resistor coupled to drains and gates of the plurality of transistors for protecting the plurality of transistors, the plurality of transistors comprising:
• channel regions on the substrate, the channel regions comprising a semiconductor layer;
• a first insulating film on the channel regions and the substrate;
• gate metals on the first insulating film, the gate metals comprising a first metal layer, wherein the gate metals are coupled to an end of the resistor;
• a second insulating film on the gate metals and the first insulating film;
• and
• source-drain metals on the second insulating film, the source-drain metals comprising a second metal layer, wherein the source-drain metals are coupled to the channel regions and coupled to another end of the resistor.