Display device

• US 10,559,602 B2
• Filed: 08/24/2017
• Issued: 02/11/2020
• 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): Abdelaziez, Yasser A
• Application Number:
  US15/685,287
• Publication Number:
  US 20170352686A1
• Time in Patent Office: 901 Days
• 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 having a plurality of pixels, at least one of the plurality of pixels comprising:

a transistor;

a pixel electrode;

a first insulating layer over the transistor and the pixel electrode, the first insulating layer having an opening through which part of the pixel electrode is exposed;

a second insulating layer on the first insulating layer and the part of the pixel electrode; and

a common electrode over the pixel electrode,

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

wherein the common electrode comprises;

a plurality of first regions provided parallel to each other, each of the plurality of first regions having a stripe pattern including a first bent portion and a second bent portion;

a second region being connected to ends of the plurality of first regions; and

a third region intersecting with the scan line and being connected to a common electrode in an adjacent pixel, and

wherein the third region does not overlap with the signal line.

2. The display device according to claim 1, wherein the transistor comprises a gate electrode, a gate insulating film over the gate electrode, and a semiconductor layer over the gate insulating film.

3. The display device according to claim 1, wherein extending directions of the plurality of first regions and an extending direction of the signal line make, a first angle.

4. The display device according to claim 1, wherein extending directions of the second region and the third region are parallel to the extending direction of the signal line.

5. The display device according to claim 1, wherein a channel formation region of the transistor comprises an oxide semiconductor.

6. The display device according to claim 1, further comprising a liquid crystal layer over the pixel electrode and the common electrode.

7. A display device having a plurality of pixels, at least one of the plurality of pixels comprising:

a transistor;

a pixel electrode;

a first insulating layer over the transistor and the pixel electrode, the first insulating layer having an opening through which part of the pixel electrode is exposed;

a second insulating layer on the first insulating layer and the part of the pixel electrode; and

a common electrode over the pixel electrode,

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

wherein the common electrode comprises;

a first end portion being parallel to the scan line;

a second end portion being adjacent to the first end portion, the second end portion being parallel to the signal line;

a third end portion facing to the first end portion;

a plurality of slits provided between the first end portion and the third end portion, each of the plurality of slits having a stripe pattern including a first bent portion and a second bent portion; and

a connection portion intersecting with the scan line and being connected to the first end portion of the common electrode and a third end portion of a common electrode in an adjacent pixel,

wherein the second end portion is adjacent to end portions of the plurality of slits, and

wherein the connection portion does not overlap with the signal line.

8. The display device according to claim 7, wherein the transistor comprises a gate electrode, a gate insulating film over the gate electrode, and a semiconductor layer over the gate insulating film.

9. The display device according to claim 7, wherein the common electrode further comprises a region between adjacent two of the plurality of slits, the region having zigzag stripe shape and extending in a direction parallel to the plurality of slits.

10. The display device according to claim 7, wherein an extending direction of the connection portion of the common electrode is parallel to an extending direction of the signal line.

11. The display device according to claim 7, wherein a channel formation region of the transistor comprises an oxide semiconductor.

12. The display device according to claim 7, further comprising a liquid crystal layer over the pixel electrode and the common electrode.