Display device, electronic device including the same, and method of manufacturing the same

A method of manufacturing a display device including a first photo sensor on a first pixel row and a second photo sensor on a second pixel row, the method comprising:

• forming a first semiconductor layer on a substrate, wherein the first semiconductor layer constitutes a semiconductor layer of each of a first sensor transistor and a second sensor transistor of each of the first photo sensor and the second photo sensor;
• forming a first gate electrode layer on the first semiconductor layer, wherein the first gate electrode layer constitutes a gate electrode of each of the first sensor transistor and the second sensor transistor;
• forming a second semiconductor layer on the first gate electrode layer, wherein the second semiconductor layer constitutes a semiconductor layer of a third sensor transistor of each of the first photo sensor and the second photo sensor;
• forming a second gate electrode layer on the second semiconductor layer, wherein the second gate electrode layer constitutes a gate electrode of the third sensor transistor;
• forming a first source drain electrode on the second gate electrode layer, wherein the first source drain electrode includes a power line which extends in a first direction on the second pixel row and is connected to the second semiconductor layer and a power line connection electrode which is located on the first pixel row and is connected to the second semiconductor layer;
• and
• forming a second source drain electrode on the first source drain electrode,
• wherein the second source drain electrode includes a power line extension electrode extending in a second direction different from the first direction, the power line extension electrode being connected to the power line and the power line connection electrode.