Liquid crystal display device and electronic device
View Patent ↗To provide a semiconductor device, a liquid crystal display device, and an electronic device which have a wide viewing angle and in which the number of manufacturing steps, the number of masks, and manufacturing cost are reduced compared with a conventional one. The liquid crystal display device includes a first electrode formed over an entire surface of one side of a substrate; a first insulating film formed over the first electrode; a thin film transistor formed over the first insulating film; a second insulating film formed over the thin film transistor; a second electrode formed over the second insulating film and having a plurality of openings; and a liquid crystal over the second electrode. The liquid crystal is controlled by an electric field between the first electrode and the second electrode.
1. A liquid crystal display device comprising:
a first electrode formed over an entire surface of one side of a substrate;
a first insulating film formed over the first electrode;
a thin film transistor formed over the first insulating film;
a second insulating film formed over the thin film transistor, wherein the second insulating film has an opening;
a third insulating film formed over the second insulating film and in the opening of the second insulating film;
a second electrode formed over the third insulating film, wherein the second electrode has a plurality of openings over the opening of the second insulating film and is electrically connected to the thin film transistor; and
a liquid crystal over the second electrode,
wherein the liquid crystal is controlled by an electric field between the first electrode and the second electrode.
2. The liquid crystal display device according to claim 1 , wherein the first electrode and the second electrode are light-transmitting conductive films.
3. The liquid crystal display device according to claim 1 ,
wherein one of the first electrode and the second electrode is a light-transmitting conductive film; and
the other of the first electrode and the second electrode is a reflective conductive film.
4. An electronic device provided with the liquid crystal display device according to claim 1 .
5. A liquid crystal display device comprising:
a first electrode formed over an entire surface of one side of a substrate;
a first insulating film formed over the first electrode;
a thin film transistor formed over the first insulating film;
the thin film transistor comprising:
a semiconductor film formed over the first electrode;
a gate insulating film formed over the semiconductor film;
a gate electrode formed over the gate insulating film;
a second insulating film formed over the gate electrode, wherein the second insulating film has an opening;
a third insulating film formed over the second insulating film and in the opening of the second insulating film;
a second electrode formed over the third insulating film, wherein the second electrode has a plurality of openings over the opening of the second insulating film and is electrically connected to the thin film transistor; and
a liquid crystal over the second electrode,
wherein the liquid crystal is controlled by an electric field between the first electrode and the second electrode.
6. The liquid crystal display device according to claim 5 , wherein the first electrode and the second electrode are light-transmitting conductive films.
7. The liquid crystal display device according to claim 5 ,
wherein one of the first electrode and the second electrode is a light-transmitting conductive film; and
the other of the first electrode and the second electrode is a reflective conductive film.
8. An electronic device provided with the liquid crystal display device according to claim 5 .
9. A liquid crystal display device comprising:
a first electrode formed over an entire surface of one side of a substrate;
a first insulating film formed over the first electrode;
a thin film transistor formed over the first insulating film;
the thin film transistor comprising:
a gate electrode formed over the first electrode;
a gate insulating film formed over the gate electrode;
a semiconductor film formed over the gate insulating film;
a second insulating film formed over the semiconductor film, wherein the second insulating film has an opening;
a third insulating film formed over the second insulating film and in the opening of the second insulating film;
a second electrode formed over the third insulating film, wherein the second electrode has a plurality of openings over the opening of the second insulating film and is electrically connected to the thin film transistor; and
a liquid crystal over the second electrode,
wherein the liquid crystal is controlled by an electric field between the first electrode and the second electrode.
10. The liquid crystal display device according to claim 9 , wherein the first electrode and the second electrode are light-transmitting conductive films.
11. The liquid crystal display device according to claim 9 ,
wherein one of the first electrode and the second electrode is a light-transmitting conductive film; and
the other of the first electrode and the second electrode is a reflective conductive film.
12. An electronic device provided with the liquid crystal display device according to claim 9 .
13. A liquid crystal display device comprising:
a first electrode formed over an entire surface of one side of a substrate;
a first insulating film formed over the first electrode;
a thin film transistor formed over the first insulating film, the thin film transistor comprising a semiconductor film;
a second insulating film formed over the thin film transistor;
a second electrode formed over the second insulating film, wherein the second electrode has a plurality of openings and is directly connected to the semiconductor film; and
a liquid crystal over the second electrode,
wherein the liquid crystal is controlled by an electric field between the first electrode and the second electrode.
14. The liquid crystal display device according to claim 13 , wherein the first electrode and the second electrode are light-transmitting conductive films.
15. The liquid crystal display device according to claim 13 ,
wherein one of the first electrode and the second electrode is a light-transmitting conductive film; and
the other of the first electrode and the second electrode is a reflective conductive film.
16. An electronic device provided with the liquid crystal display device according to claim 13 .
17. The liquid crystal display device according to claim 13 , wherein the thin film transistor is a top-gate thin film transistor.
18. A method for manufacturing a liquid crystal display device, comprising the steps of:
forming a first electrode over a first substrate;
forming a first insulating film over the first electrode without patterning the first electrode;
forming a thin film transistor over the first insulating film;
forming a second insulating film over the thin film transistor, wherein the second insulating film has an opening;
forming a third insulating film over the second insulating film and in the opening of the second insulating film;
forming a second electrode electrically connected to the thin film transistor over the third insulating film, wherein the second electrode has a plurality of openings over the opening of the second insulating film; and
attaching a second substrate to the first substrate with a liquid crystal therebetween.
19. The method according to claim 18 , wherein the first electrode and the second electrode are light-transmitting conductive films.
20. The method according to claim 18 ,
wherein one of the first electrode and the second electrode is a light-transmitting conductive film; and
the other of the first electrode and the second electrode is a reflective conductive film.
21. The method according to claim 18 , wherein the liquid crystal display device is provided for an electronic device.
22. A liquid crystal display device comprising:
a first electrode formed over an entire surface of one side of a substrate;
a first insulating film formed over the first electrode;
a thin film transistor formed over the first insulating film;
a second insulating film formed over the thin film transistor;
a second electrode formed over the second insulating film, wherein the second electrode has a plurality of openings and is electrically connected to the thin film transistor; and
a liquid crystal over the second electrode,
wherein the liquid crystal is controlled by an electric field between the first electrode and the second electrode, and
wherein a distance between the first electrode and the second electrode in a first region is smaller than that in a second region.
23. The liquid crystal display device according to claim 22 , wherein the first electrode and the second electrode are light-transmitting conductive films.
24. The liquid crystal display device according to claim 22 ,
wherein one of the first electrode and the second electrode is a light-transmitting conductive film; and
the other of the first electrode and the second electrode is a reflective conductive film.
25. An electronic device provided with the liquid crystal display device according to claim 22 .
26. The liquid crystal display device according to claim 22 , wherein the thin film transistor is located in the second region.
27. The liquid crystal display device according to claim 22 , wherein the second insulating film has an opening in the first region.