Patent ID: 9431470
Filing Date: 2016-08-30
CPC Classification: H01L

Claim Text:
1. A display device comprising: a first transistor and a second transistor each comprising a gate electrode, a semiconductor film, a gate insulating film between the gate electrode and the semiconductor film, a source electrically connected to the semiconductor film, and a drain electrically connected to the semiconductor film; a capacitor, one electrode of the capacitor electrically connected to the gate electrode of the second transistor; a gate wiring in contact with the gate electrode of the first transistor; a wiring electrically connected to one of the source and the drain of the second transistor; an insulating film over the first transistor and the second transistor; and an electroluminescence element over the insulating film, the electroluminescence element electrically connected to the other of the source and the drain of the second transistor, wherein one of the source and the drain of the first transistor is electrically connected to the gate electrode of the second transistor, wherein the semiconductor film of each of the first transistor and the second transistor includes a LDD region, wherein a length of the LDD region of the first transistor is 0.5 μm to 3.5 μm, wherein a channel length of the first transistor is 0.2 μm to 18 μm, wherein the LDD region of the second transistor includes a first region and a second region, wherein the first region and the gate electrode of the second transistor overlap with each other, wherein the second region and the gate electrode of the second transistor do not overlap with each other, wherein a length of the first region is 0.1 μm to 3 μm, wherein a channel length of the second transistor is 1 μm to 50 μm, wherein a channel width of the second transistor is 0.5 μm to 10 μm, and wherein each of the first transistor and the second transistor has n-type conductivity.