LIQUID CRYSTAL DISPLAY DEVICE

• US 20140300852A1
• Filed: 11/16/2012
• Published: 10/09/2014
• Est. Priority Date: 11/25/2011
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Yoshida, Masahiro
• Granted Patent: US 9,703,150 B2
• Time in Patent Office: Days
• US Class Current: 349/143
• CPC Class Codes: G02F 1/133302 Rigid substrates, e.g. inorganic substrates
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• 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 1/1339 Gaskets; Spacers; Sealing of cells
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels
• CPC Class Codes: G02F 1/13456 Cell terminals located on one side of the display only
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/13629 Multilayer wirings
• CPC Class Codes: G02F 1/136295 Materials; Compositions; Manufacture processes
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel

Abstract

The present invention provides a liquid crystal display device which can be miniaturized while preventing display defects such as flicker. The present invention relates to a liquid crystal display device including a wiring connected to an electrode to supply a common signal. The electrode includes a first electrode portion formed in a transparent conductive layer. The wiring is formed outside a display region and includes at least one of the first wiring portion and a second wiring portion and a third wiring portion facing the at least one of the first wiring portion and the second wiring portion. The first wiring portion, the second wiring portion, and the third wiring portion are respectively formed in a first conductive layer, a second conductive layer, and a third conductive layer.

Claims

1. A liquid crystal display device, comprising an active matrix substrate and a plurality of pixels formed in a display region,

the active matrix substrate comprising

a laminated structure comprising a plurality of conductive layers;

an electrode to supply a common signal to the pixels; and

a wiring formed outside the display region and connected to the electrode,

the conductive layers comprising a first conductive layer;

a second conductive layer on the first conductive layer;

a third conductive layer on the second conductive layer; and

a transparent conductive layer,

the electrode comprising a first electrode portion formed in the transparent conductive layer,

the wiring comprising at least one of a first wiring portion and a second wiring portion; and

a third wiring portion facing the at least one of the first wiring portion and the second wiring portion, and

the first wiring portion, the second wiring portion, and the third wiring portion being formed in the first conductive layer, the second conductive layer, and the third conductive layer, respectively.

2. The liquid crystal display device according to claim 1,

wherein the wiring comprises the first wiring portion and the second wiring portion, and

the first wiring portion is connected to the second wiring portion through the third wiring portion.

3. The liquid crystal display device according to claim 1,

wherein the transparent conductive layer and the third conductive layer are adjacent to each other.

4. The liquid crystal display device according to claim 3,

wherein the wiring is connected to the electrode as a result of contact between the third wiring portion and the first electrode portion.

5. The liquid crystal display device according to claim 3,

wherein the electrode further comprises a second electrode portion formed between adjacent pixels, and

the second electrode portion is formed in the third conductive layer and connected to the third wiring portion.

6. The liquid crystal display device according to claim 1,

wherein the third conductive layer has a sheet resistance smaller than the transparent conductive layer.

7. The liquid crystal display device according to claim 1,

wherein the active matrix substrate further comprises a first insulating film formed between the first conductive layer and the second conductive layer, and a second insulating film formed between the second conductive layer and the third conductive layer.

8. The liquid crystal display device according to claim 7,

wherein the wiring comprises the first wiring portion, and

the third wiring portion contacts the first wiring portion through a contact hole penetrating the first insulating film and the second insulating film.

9. The liquid crystal display device according to claim 7,

wherein the wiring comprises the second wiring portion, and

the third wiring portion contacts the second wiring portion through a contact hole penetrating the second insulating film.

10. The liquid crystal display device according to claim 7,

wherein the active matrix substrate further comprises a gate bus line and a source bus line both formed in the display region, and a lead-out wiring formed outside the display region and connected to the gate bus line or the source bus line,

the lead-out wiring intersects the wiring, and

the wiring is constricted at an intersection of the wiring and the lead-out wiring.

11. The liquid crystal display device according to claim 10,

wherein the lead-out wiring is formed in the first conductive layer,

the wiring comprises the second wiring portion, and

the second wiring portion is constricted at an intersection of the second wiring portion and the lead-out wiring.

12. The liquid crystal display device according to claim 10,

wherein the lead-out wiring is formed in the second conductive layer,

the wiring comprises the first wiring portion, and

at least one of the first wiring portion and the third wiring portion is constricted at an intersection of the at least one of the first wiring portion and the third wiring portion and the lead-out wiring.

13. The liquid crystal display device according to claim 12,

wherein a value calculated by dividing the relative permittivity of the second insulating film by the film thickness of the second insulating film is larger than a value calculated by dividing the relative permittivity of the first insulating film by the film thickness of the first insulating film, and

the third wiring portion is constricted at an intersection of the third wiring portion and the lead-out wiring.

14. The liquid crystal display device according to claim 12,

wherein a value calculated by dividing the relative permittivity of the second insulating film by the film thickness of the second insulating film is smaller than a value calculated by dividing the relative permittivity of the first insulating film by the film thickness of the first insulating film, and

the first wiring portion is constricted at an intersection of the first wiring portion and the lead-out wiring.

15. The liquid crystal display device according to claim 1,

wherein the electrode is a common electrode,

the active matrix substrate further comprises a pixel electrode,

the common electrode comprises a plurality of linear parts spaced apart from one another in each pixel, and

the pixel electrode faces the space between the linear parts.