Display device and manufacturing method thereof

A method for manufacturing a display device, the method comprising:

• preparing a substrate that includes a first substrate portion, a second substrate portion, and a third substrate portion positioned between the first substrate portion and the second substrate portion;
• forming a first transistor that overlaps the third substrate portion;
• forming a first common electrode portion that overlaps the first substrate portion;
• after the first common electrode portion has been formed, forming a first sub-pixel electrode that overlaps the first common electrode portion and is electrically connected to the first transistor;
• forming a first roof layer and a second roof layer substantially simultaneously, wherein the first roof layer overlaps the first substrate portion, and wherein the second roof layer overlaps the second substrate portion and is spaced from the first roof layer;
• and
• providing a first liquid crystal set between the first common electrode portion and the first sub-pixel electrode, such that the first common electrode portion is positioned between the first substrate portion and the first liquid crystal set, and such that the first sub-pixel electrode is positioned between the first liquid crystal set and the first roof layer.