Light emitting device
First Claim
1. A light-emitting device including a pixel portion, the pixel portion comprising:
- a first transistor including a channel formation region, a source region, a drain region, and a gate;
a first insulating film over the first transistor;
a first wiring over the first insulating film, the first wiring electrically connected to one of the source region and the drain region;
a second insulating film over the first wiring;
a pixel electrode over and in contact with the second insulating film; and
a second wiring over and in contact with the second insulating film,wherein the channel formation region includes a first region,wherein the second wiring includes a second region,wherein the gate includes a third region, andwherein the first region, the second region, and the third region overlap with one another.
1 Assignment
0 Petitions
Accused Products
Abstract
A light emitting device is provided which can prevent a change in gate voltage due to leakage or other causes and at the same time can prevent the aperture ratio from lowering. A capacitor storage is formed from a connection wiring line, an insulating film, and a capacitance wiring line. The connection wiring line is formed over a gate electrode and an active layer of a TFT of a pixel, and is connected to the active layer. The insulating film is formed on the connection wiring line. The capacitance wiring line is formed on the insulating film. This structure enables the capacitor storage to overlap the TFT, thereby increasing the capacity of the capacitor storage while keeping the aperture ratio from lowering. Accordingly, a change in gate voltage due to leakage or other causes can be avoided to prevent a change in luminance of an OLED and flickering of screen in analog driving.
-
Citations
19 Claims
-
1. A light-emitting device including a pixel portion, the pixel portion comprising:
-
a first transistor including a channel formation region, a source region, a drain region, and a gate; a first insulating film over the first transistor; a first wiring over the first insulating film, the first wiring electrically connected to one of the source region and the drain region; a second insulating film over the first wiring; a pixel electrode over and in contact with the second insulating film; and a second wiring over and in contact with the second insulating film, wherein the channel formation region includes a first region, wherein the second wiring includes a second region, wherein the gate includes a third region, and wherein the first region, the second region, and the third region overlap with one another. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A light-emitting device including a pixel portion, the pixel portion comprising:
-
a first transistor and a second transistor each including a channel formation region, a source region, a drain region, and a gate; a first wiring electrically connected to the gate of the first transistor and the gate of the second transistor; a first insulating film over the first transistor and the second transistor; a second wiring over the first insulating film, the second wiring electrically connected to one of the source region and the drain region of the first transistor, a third wiring over the first insulating film, the third wiring electrically connected to one of the source region and the drain region of the second transistor; a second insulating film over the second wiring and the third wiring; a pixel electrode over and in contact with the second insulating film; and a fourth wiring over and in contact with the second insulating film, wherein the channel formation region of the first transistor includes a first region, wherein the channel formation region of the second transistor includes a second region, wherein the fourth wiring includes a third region and a fourth region, wherein the gate of the first transistor includes a fifth region, wherein the gate of the second transistor includes a sixth region, wherein the first region, the third region, and the fifth region overlap with one another, and wherein the second region, the fourth region, and the sixth region overlap with one another. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
-
Specification