Substrate for use in manufacturing display device and method for forming element on substrate

A display device comprising:

• a first pixel electrode and a second pixel electrode disposed on a substrate;
• a first light emission layer disposed on the first pixel electrode;
• a second light emission layer disposed on the second pixel electrode and emitting a different color from the first light emission layer;
• a plurality of first marks on the substrate, wherein a first virtual line corresponds to one of the plurality of first marks and a third virtual line corresponds to another of the plurality of first marks;
• a second mark disposed on the substrate and spaced from the plurality of first marks, wherein a second virtual line corresponds to the second mark and intersects the first virtual line and the third virtual line;
• a first indicator comprising a same material as the first light emission layer and disposed at an intersection point of the first virtual line and the second virtual line;
• and
• a second indicator comprising a same material as the second light emission layer and disposed at an intersection point of the third virtual line and the second virtual line,
• wherein the plurality of first marks do not comprise the same material as the first light emission layer and the same material as the second light emission layer.