Patent ID: 7915689

Claim:
A display device comprising: a first thin film transistor comprises a first control electrode, a first semiconductor which overlaps the first control electrode, and a first input electrode and a first output electrode opposite to each other adjacent to the first semiconductor; a second thin film transistor comprises a second control electrode, a second semiconductor which overlaps the second control electrode, and a second input electrode and a second output electrode opposite to each other on or under the second semiconductor; and a gate insulating layer disposed between the first control electrode and the second control electrode and the first semiconductor and the second semiconductor; wherein the first semiconductor comprises a first portion disposed between the first input electrode and the first output electrode, and having a first crystallinity, and a second portion which overlaps the first input electrode or the first output electrode and having a second crystallinity, wherein the first crystallinity is higher than the second crystallinity, wherein the gate insulating layer comprises a third portion disposed under the first semiconductor and the second semiconductor; and a fourth portion except for the third portion, wherein the fourth portion is thinner than the third portion.