Display device

Patent metadata

Field	Value
Publication number	US-2018019291-A1
Application number	US-201715496043-A
Country	US
Kind code	A1
Filing date	Apr 25, 2017
Priority date	Jul 15, 2016
Publication date	Jan 18, 2018
Grant date	—

Abstract

Provided is a display device including a plurality of pixels at least one of which has a first transistor and a light-emitting element. The first transistor includes a gate electrode, a gate insulating film over the gate electrode, an oxide semiconductor film over the gate insulating film, and a first terminal and a second terminal electrically connected to the semiconductor film. The second terminal is electrically connected to the light-emitting element. A region in which the first terminal overlaps with the gate electrode can be smaller than a region in which the second terminal overlaps with the gate electrode.

First claim

What is claimed is:

1 . A display device comprising:
a plurality of pixels, at least one of the plurality of pixels including:
a first transistor comprising:
a gate electrode;
a gate insulating film over the gate electrode;
an oxide semiconductor film over the gate insulating film; and
a first terminal and a second terminal electrically connected to the oxide semiconductor film; and

a light-emitting element electrically connected to the second terminal,
wherein a region of the first terminal overlapping with the gate electrode is smaller than a region of the second terminal overlapping with the gate electrode.

2 . The display device according to claim 1 ,
wherein the oxide semiconductor film has a first side and a second side opposing each other, and wherein a portion of the first side overlapping with the first terminal is shorter than a portion of the second side overlapping with the second terminal.

3 . The display device according to claim 1 ,
wherein the second terminal has an open shape, and wherein the first terminal is arranged so as to intersect an opening of the open shape.

4 . The display device according to claim 1 ,
wherein the first transistor is configured so that current flows from the first terminal to the second terminal.

5 . The display device according to claim 1 , further comprising a capacitor under the first transistor, the capacitor including:
a first electrode; an insulating film over the first electrode; and the gate electrode over the insulating film.

6 . The display device according to claim 5 ,
wherein the gate electrode is shared by the first transistor and the capacitor.

7 . The display device according to claim 5 ,
wherein the first electrode overlaps with the oxide semiconductor film.

8 . The display device according to claim 5 , further comprising a second transistor including:
a gate electrode; a semiconductor film; the insulating film sandwiched between the gate electrode and the semiconductor film; and a first terminal and a second terminal electrically connected to the semiconductor film, wherein the second terminal of the second transistor is electrically connected to the gate electrode of the first transistor.

9 . The display device according to claim 8 ,
wherein the semiconductor film includes silicon.

10 . The display device according to claim 8 ,
wherein the semiconductor film includes an oxide semiconductor.

11 . The display device according to claim 8 ,
wherein, in the second transistor, a region of the first terminal of the second transistor-overlapping with the gate electrode of the second transistor is larger than a region of the second terminal of the second transistor overlapping with the gate electrode of the second transistor.

12 . The display device according to claim 10 ,
wherein the semiconductor film has a first side and a second side opposing each other, and wherein, in the second transistor, a portion of the first side of the second transistor overlapping with the first terminal of the second transistor is longer than a portion of the second side of the second transistor-overlapping with the second terminal of the second transistor.

13 . The display device according to claim 10 ,
wherein, in the second transistor, the first terminal of the second transistor has an open shape, and the second terminal of the second transistor-is arranged so as to intersect an opening of the open shape of the second transistor.

14 . The display device according to claim 1 ,
wherein the at least one of the pixels further comprises a second transistor including:
a second gate electrode existing in the same layer as the gate electrode;
a second gate insulating film arranged under the second gate electrode; and
a semiconductor film arranged under the second gate insulating film.

15 . The display device according to claim 14 ,
wherein at least one of the pixels further comprises a capacitor including:
the gate electrode;
the second gate insulating film; and
an electrode existing in the same layer as the semiconductor film.

16 . The display device according to claim 15 ,
wherein the semiconductor film and the electrode are each a polycrystalline semiconductor film.

Assignees

• Japan Display Inc

Inventors

• Morita Tetsuo
• Kimura Hiroyuki
• Shibusawa Makoto
• Tabatake Hiroshi
• Ogawa Yasuhiro

Classifications

• H10D30/6757

  characterised by the structure of the channel, e.g. transverse or longitudinal shape or doping profile (TFTs having channel structures for preventing kink or snapback effects H10D30/6708; TFTs having lightly-doped source or drain extensions H10D30/6715) · CPC title

• H01L27/3265

  Electricity · mapped topic

• H01L29/7869

  Electricity · mapped topic

• H01L29/78675

  Electricity · mapped topic

• H01L29/78696

  Electricity · mapped topic