Display device

• US 9,337,214 B2
• Filed: 09/08/2014
• Issued: 05/10/2016
• Est. Priority Date: 09/13/2013
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kubota, Daisuke, Hatsumi, Ryo
• Primary Examiner(s): Potter, Roy
• Assistant Examiner(s): PATTON, PAUL E
• Application Number:
  US14/479,684
• Publication Number:
  US 20150076492A1
• Time in Patent Office: 610 Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133707 Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/13606 having means for reducing parasitic capacitance
• CPC Class Codes: G02F 1/1362 Active matrix addressed cells G02F1/134336, G02F1/134363 take precedence
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: H01L 27/1225 with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
• CPC Class Codes: H01L 27/1229 with different crystal properties within a device or between different devices
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/1248 with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement
• CPC Class Codes: H01L 27/1255 integrated with passive devices, e.g. auxiliary capacitors
• CPC Class Codes: H01L 29/045 by their particular orientation of crystalline planes
• CPC Class Codes: H01L 29/7869 having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate

Abstract

To provide a display device with excellent display quality, in a display device including a signal line, a scan line, a transistor, a pixel electrode, and a common electrode in a pixel, the common electrode is included in which an extending direction of a region overlapping with the signal line differs from an extending direction of a region overlapping with the pixel electrode in a planar shape and the extending directions intersect with each other between the signal line and the pixel electrode. Thus, a change in transmittance of the pixel can be suppressed; accordingly, flickers can be reduced.

Claims

1. A display device comprising:

a signal line;

a scan line;

a transistor;

a pixel electrode; and

a common electrode having a zigzag shape so that the common electrode crosses the signal line,

wherein the transistor is electrically connected to the signal line, the scan line, and the pixel electrode,

wherein the common electrode comprises a first region overlapping with the signal line and a second region overlapping with the pixel electrode,

wherein an extending direction of the first region differs from an extending direction of the second region, and

wherein a connection portion of the first region and the second region is located between the signal line and the pixel electrode in a planar shape.

2. The display device according to claim 1,

wherein an inner angle formed by the first region and the second region in a planar shape has a first angle,

wherein an angle formed by the extending direction of the first region and a perpendicular of the signal line in a planar shape has a second angle,

wherein the first angle is greater than 90°

and less than 180°

,

wherein the second angle is greater than 0° and

less than 90°

, and

wherein the sum of the first angle and the second angle is greater than 135° and

less than 180°

.

3. The display device according to claim 1, further comprising:

a liquid crystal element, a first terminal of the liquid crystal element electrically connected to the pixel electrode, and a second terminal of the liquid crystal element electrically connected to the common electrode.

4. A display device comprising:

a first insulating film over a gate electrode;

a semiconductor film over the first insulating film, the semiconductor film overlapping with the gate electrode;

a pixel electrode over the first insulating film, the pixel electrode electrically connected to the semiconductor film;

a signal line electrically connected to the semiconductor film;

a second insulating film over the pixel electrode; and

a common electrode over the second insulating film, the common electrode having a zigzag shape so that the common electrode crosses the signal line,

wherein the common electrode comprises a first region overlapping with the signal line and a second region overlapping with the pixel electrode,

wherein an extending direction of the first region differs from an extending direction of the second region, and

wherein a connection portion of the first region and the second region is located between the signal line and the pixel electrode in a planar shape.

5. The display device according to claim 4,

wherein an inner angle formed by the first region and the second region in a planar shape has a first angle,

wherein an angle formed by the extending direction of the first region and a perpendicular of the signal line in a planar shape has a second angle,

wherein the first angle is greater than 90°

and less than 180°

,

wherein the second angle is greater than 0° and

less than 90°

, and

wherein the sum of the first angle and the second angle is greater than 135° and

less than 180°

.

6. The display device according to claim 4, further comprising:

a third insulating film over the semiconductor film, the pixel electrode, and the signal line; and

a liquid crystal layer over the third insulating film.

7. The display device according to claim 4, further comprising:

a scan line including the gate electrode.

8. The display device according to claim 4, further comprising:

an oxide insulating film between the semiconductor film and the second insulating film, the oxide insulating film overlapping with the semiconductor film,

wherein the oxide insulating film has an opening through which part of the pixel electrode is exposed.

9. The display device according to claim 4,

wherein the semiconductor film is in contact with a surface of the first insulating film, and

wherein the pixel electrode is in contact with the surface of the first insulating film.

10. The display device according to claim 4, wherein the semiconductor film and the pixel electrode have a multilayer structure.

11. A display device comprising:

a first insulating film over a gate electrode;

an oxide semiconductor film over the first insulating film, the oxide semiconductor film overlapping with the gate electrode;

a pixel electrode over the first insulating film, the pixel electrode electrically connected to the oxide semiconductor film;

a signal line electrically connected to the oxide semiconductor film;

a second insulating film over the pixel electrode; and

a common electrode over the second insulating film, the common electrode having a zigzag shape so that the common electrode crosses the signal line,

wherein the common electrode comprises a first region overlapping with the signal line and a second region overlapping with the pixel electrode,

wherein an extending direction of the first region differs from an extending direction of the second region, and

wherein a connection portion of the first region and the second region is located between the signal line and the pixel electrode in a planar shape.

12. The display device according to claim 11,

wherein an inner angle formed by the first region and the second region in a planar shape has a first angle,

wherein an angle formed by the extending direction of the first region and a perpendicular of the signal line in a planar shape has a second angle,

wherein the first angle is greater than 90°

and less than 180°

,

wherein the second angle is greater than 0° and

less than 90°

, and

wherein the sum of the first angle and the second angle is greater than 135° and

less than 180°

.

13. The display device according to claim 11, further comprising:

a third insulating film over the oxide semiconductor film, the pixel electrode, and the signal line; and

a liquid crystal layer over the third insulating film.

14. The display device according to claim 11, further comprising:

a scan line including the gate electrode.

15. The display device according to claim 11, further comprising:

an oxide insulating film between the oxide semiconductor film and the second insulating film, the oxide insulating film overlapping with the oxide semiconductor film,

wherein the oxide insulating film has an opening through which part of the pixel electrode is exposed.

16. The display device according to claim 11,

wherein the oxide semiconductor film is in contact with a surface of the first insulating film, and

wherein the pixel electrode is in contact with the surface of the first insulating film.

17. The display device according to claim 11, wherein the oxide semiconductor film and the pixel electrode have a multilayer structure.

18. The display device according to claim 11, wherein the oxide semiconductor film and the pixel electrode each comprise indium and zinc.