Display device with contact between an electrode of a thin film transistor and a pixel electrode
View Patent ↗There is provided an excellent contact between an electrode of a thin film transistor and a pixel electrode. A display device includes: an organic planarization film including a first contact hole opened on an electrode of a thin film transistor; an interlayer insulating film including a second contact hole opened on the electrode of the thin film transistor and on the organic planarization film; a base electrode that covers a portion where an end of the second contact hole overlaps a side wall of the first contact hole; and a pixel electrode contacted with the electrode of the thin film transistor.
1. A display device comprising:
an array substrate; and
a counter substrate,
wherein: the array substrate includes:
a thin film transistor including a semiconductor film;
an interlayer film that covers the semiconductor film, and that includes a contact hole;
an electrode connected with the semiconductor film via the contact hole;
a first interlayer film that covers the electrode;
a common electrode provided on the first interlayer film;
a first electrode provided on a same layer as the common electrode and isolated from the common electrode;
a second interlayer film that covers the common electrode; and
a pixel electrode provided on the second interlayer film;
the first interlayer film includes a first contact hole opened on the electrode;
the second interlayer film includes a second contact hole opened on the electrode and on the first interlayer film;
the first electrode covers a portion of the first interlayer film from an end of the second contact hole extending toward an end of the first contact hole; and
the pixel electrode is directly contacted with the electrode at a bottom of the first contact hole.
2. The display device according to claim 1 , wherein the pixel electrode is contacted with the first electrode.
3. The display device according to claim 1 , wherein the first electrode and the second interlayer film cover a part of the electrode.
4. The display device according to claim 1 , wherein the second interlayer film covers a part of the first electrode.
5. The display device according to claim 4 , wherein the pixel electrode extends over a portion where the second interlayer film covers the first electrode.
6. The display device according to claim 1 , wherein the first interlayer film covers a part of the electrode.
7. The display device according to claim 1 , wherein the first interlayer film is an organic film.
8. The display device according to claim 1 , wherein the first interlayer film is formed of a photosensitive resin.
9. The display device according to claim 1 , wherein the first interlayer film is a planarization film.
10. The display device according to claim 1 , wherein the second interlayer film is a silicon nitride film (SiN).
11. The display device according to claim 1 , wherein the second interlayer film is an interlayer insulating film.
12. The display device according to claim 1 ,
wherein: a liquid crystal layer sandwiched between the array substrate and the counter substrate is included;
the array substrate includes an alignment film that covers the pixel electrode; and
the counter substrate includes an alignment film.
13. A display device comprising:
a thin film transistor including a semiconductor film;
an interlayer film that covers the semiconductor film, and that includes a contact hole;
a drain electrode connected with the semiconductor film via the contact hole;
an organic planarization film that covers the drain electrode;
a common electrode provided on the organic planarization film;
a base electrode provided on a same layer as the common electrode and isolated from the common electrode;
an interlayer insulating film that covers the common electrode; and
a pixel electrode provided on the organic planarization film,
wherein: the organic planarization film includes a first contact hole opened on the drain electrode;
the interlayer insulating film includes a second contact hole opened on the drain electrode and on the organic planarization film;
the base electrode covers a portion of the organic planarization film from an end of the second contact hole extending toward an end of the first contact hole; and
the pixel electrode is directly contacted with the drain electrode at a bottom of the first contact hole.
14. The display device according to claim 13 , wherein the pixel electrode is contacted with the base electrode.
15. The display device according to claim 13 , wherein the base electrode and the interlayer insulating film cover a part of the drain electrode.
16. The display device according to claim 13 , wherein the interlayer insulating film covers a part of the base electrode.
17. The display device according to claim 16 , wherein the pixel electrode extends over a portion where the interlayer insulating film covers the base electrode.
18. The display device according to claim 13 , wherein the organic planarization film covers a part of the drain electrode.
19. The display device according to claim 13 , wherein the organic planarization film is formed of a photosensitive resin.
20. The display device according to claim 13 , wherein the interlayer insulating film is a silicon nitride film (SiN).