Liquid crystal display device
View Patent ↗A liquid crystal display device is provided with a thin film transistor which includes a gate electrode film that is provided in a first electrode layer located over a first insulating layer, a semiconductor film that is disposed over the gate electrode film via a second insulating layer, a drain electrode and a source electrode that are provided in a second electrode layer located over the semiconductor film and are in contact with an upper surface of the semiconductor film, and a light blocking film that is disposed under the first insulating layer. At least a part thereof overlaps the semiconductor film and the gate electrode film in a plan view. One of the drain electrode and the source electrode is connected to a gate line, and the light blocking film is electrically connected to the source electrode.
1. A liquid crystal display device comprising:
a pixel;
a pixel transistor;
an image signal line that supplies an image signal to the pixel;
a scanning signal line that supplies a control signal to the pixel; and
an output transistor that outputs the control signal to the scanning signal line,
wherein the output transistor includes
a gate electrode film that is provided in a first electrode layer located over a first insulating layer;
a semiconductor film that is disposed above the gate electrode film via a second insulating layer;
a drain electrode that is provided in a second electrode layer located over the semiconductor film and is in contact with a part of an upper surface of the semiconductor film;
a source electrode that is provided in the second electrode layer and is in contact with a part of the upper surface of the semiconductor film; and
a light blocking film that is disposed under the first insulating layer and is provided so that at least a part thereof overlaps the semiconductor film and the gate electrode film in a plan view,
wherein one of the drain electrode and the source electrode is connected to the scanning signal line, and
wherein the light blocking film is a metal film, and is electrically connected to the source electrode.
2. The liquid crystal display device according to claim 1 , wherein the other of the drain electrode and the source electrode is connected to a clock signal line which supplies a periodic pulse.
3. The liquid crystal display device according to claim 1 , wherein the gate electrode is connected to a wiring in the second electrode layer via a first hole which penetrates through the second insulating layer, and
wherein the light blocking film is connected to the source electrode via a second hole which penetrates through the first and second insulating layers.
4. The liquid crystal display device according to claim 2 , wherein the gate electrode is connected to a wiring in the second electrode layer via a first hole which penetrates through the second insulating layer, and
wherein the light blocking film is connected to the source electrode via a second hole which penetrates through the first and second insulating layers.
5. A liquid crystal display device comprising:
a first substrate;
a pixel formed on the first substrate;
a pixel transistor formed in the pixel;
an image signal line that supplies an image signal to the pixel transistor;
a scanning signal line that supplies a control signal for controlling turning-on and turning-off of the pixel transistor; and
an output transistor that outputs the control signal to the scanning signal line,
wherein the output transistor includes
a light blocking film that is formed on the first substrate;
a first insulating layer that is formed on the light blocking film;
a gate electrode film that is provided in a first electrode layer located over the first insulating layer;
a semiconductor film that is disposed above the gate electrode film via a second insulating layer;
a drain electrode that is provided in a second electrode layer located over the semiconductor film and is in contact with a part of an upper surface of the semiconductor film; and
a source electrode that is provided in the second electrode layer and is in contact with a part of the upper surface of the semiconductor film,
wherein the light blocking film is provided so that at least a part thereof overlaps the semiconductor film and the gate electrode film in a plan view,
wherein one of the drain electrode and the source electrode is connected to the scanning signal line, and
wherein the light blocking film is a metal film, and is electrically connected to the source electrode.
6. The liquid crystal display device according to claim 5 , wherein the other of the drain electrode and the source electrode is connected to a clock signal line which supplies a periodic pulse.
7. The liquid crystal display device according to claim 5 , wherein the gate electrode is connected to a wiring in the second electrode layer via a first hole which penetrates through the second insulating layer, and
wherein the light blocking film is connected to the source electrode via a second hole which penetrates through the first and second insulating layers.
8. The liquid crystal display device according to claim 6 , wherein the gate electrode is connected to a wiring in the second electrode layer via a first hole which penetrates through the second insulating layer, and
wherein the light blocking film is connected to the source electrode via a second hole which penetrates through the first and second insulating layers.