Patent ID: 8902137

Claim:
A light-emitting device comprising: a pixel, a source signal line, a first gate signal line, a second gate signal line, a first power source line, and a second power source line, the pixel comprising: a first switch of which one terminal is connected to the source signal line, another terminal is connected to a drain terminal of a first thin film transistor, and a gate terminal is connected to the first gate signal line; a second switch of which one terminal is connected to the drain terminal of the first thin film transistor, another terminal is connected to a storage means, a gate terminal of the first thin film transistor and a gate terminal of a second thin film transistor, and a gate terminal is connected to the second gate signal line, wherein a drain terminal of the second thin film transistor is connected to the second power source line; a pixel electrode which is connected to a source terminal of the first thin film transistor and a source terminal of the second thin film transistor; a third switch of which one terminal is connected to the pixel electrode, another terminal is connected to the first power source line, and a gate terminal is connected to the first gate signal line; and a light-emitting element of which one electrode comprises the pixel electrode, wherein a potential of the first power source line is kept so as not to turn on the light-emitting element, wherein the another terminal of the second switch extends in contact with a top surface of the gate insulating layer, and wherein the another terminal of the second switch is in contact with the gate terminal of the first thin film transistor via a contact hole opened in the gate insulating layer.