Liquid crystal display device including shield electrodes and light shielding films and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9541805-B2
Application number	US-201214116485-A
Country	US
Kind code	B2
Filing date	May 22, 2012
Priority date	May 30, 2011
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

A liquid crystal display device includes a first substrate and a second substrate; a liquid crystal layer disposed between the first and second substrates; gate wirings disposed on the second substrate; source wirings disposed to intersects with the gate wirings; light shielding films provided to cover the source wirings; a first insulating film provided to cover the gate wirings, the source wirings and the light shielding films; signal electrodes provided on the first insulating film, each of which is located in a region surrounded with the gate wirings and the source wirings; a common electrode provided on the first insulating film so as not to be overlapped on the signal electrodes; and shield electrode disposed between each of the signal electrodes and each of the source wirings, the respective shield electrodes being overlapped on the light shielding films.

First claim

What is claimed is:

1. A liquid crystal display device, comprising:
a first substrate and a second substrate disposed, one main surface of the first substrate and one main surface of the second substrate facing each other;
a liquid crystal layer disposed between the first substrate and the second substrate;
a light source disposed below the second substrate;
a plurality of gate wirings disposed on or above the one main surface of the second substrate;
a plurality of source wirings disposed to intersect with the plurality of gate wirings;
light shielding films covering the plurality of source wirings;
a first insulating film covering the plurality of gate wirings, the plurality of source wirings and the light shielding films;
signal electrodes disposed on or above the first insulating film, each of the signal electrodes located in a region surrounded with the plurality of gate wirings and the plurality of source wirings;
a common electrode disposed on or above the first insulating film, not overlapping the signal electrodes; and
shield electrodes disposed between each of the signal electrodes and each of the source wirings, the respective shield electrodes overlapping the light shielding films, the shield electrodes not overlapping the signal electrodes as seen in a plan view, the shield electrodes being disposed above the source wirings with respect to the second substrate and being disposed downstream of the source wirings in a direction in which light emitted from the light source passes through the liquid crystal layer.

2. The liquid crystal display device according to claim 1 , wherein the shield electrodes are located on or above the light shielding film.

3. The liquid crystal display device according to claim 1 , wherein formation regions of the shield electrodes are located within a formation region of the common electrode.

4. The liquid crystal display device according to claim 1 ,
wherein an auxiliary capacity wiring is located on or above the one main surface of the second substrate, facing the signal electrodes through the first insulating film, and
the shield electrodes are connected to the auxiliary capacity wiring.

5. The liquid crystal display device according to claim 1 ,
wherein drain wirings connected to the signal electrodes are located on or above the one main surface of the second substrate, and
parts of the shield electrodes overlap the drain wirings through a second insulating film, respectively.

6. The liquid crystal display device according to claim 1 , wherein the shield electrodes are connected to the common electrode.

7. The liquid crystal display device according to claim 6 ,
wherein the shield electrodes are connected to the common electrode through contact holes, and
the contact holes overlap the light shielding films.

8. The liquid crystal display device according to claim 1 , wherein the respective shield electrodes have opening portions, and the opening portions of the shield electrodes overlap the source wirings, respectively.

9. A method of manufacturing a liquid crystal display device including a first substrate and a second substrate disposed, one main surface of the first substrate and one main surface of the second substrate facing each other, a liquid crystal layer disposed between the first substrate and the second substrate, a plurality of gate wirings disposed on or above the one main surface of the second substrate, a light source disposed below the second substrate, a plurality of source wirings disposed to intersect with the plurality of gate wirings, light shielding films covering the plurality of source wirings, a first insulating film covering the plurality of gate wirings, the plurality of source wirings and the light shielding films, signal electrodes disposed on or above the first insulating film, each of the signal electrodes located in a region surrounded with the plurality of gate wirings and the plurality of source wirings, a common electrode disposed on or above the first insulating film not overlapping the signal electrodes, and shield electrodes disposed between each of the signal electrodes and each of the source wirings, the respective shield electrodes overlapping the light shielding films, the shield electrodes not overlapping the signal electrodes as seen in a plan view, the shield electrodes being disposed above the source wirings with respect to the second substrate and being disposed downstream of the source wirings in a direction in which light emitted from the light source passes through the liquid crystal layer, the method comprising:
a step of forming the plurality of source wirings on or above the one main surface of the second substrate;
a step of forming the light shielding films on or above the one main surface of the second substrate, covering the source wirings;
a step of forming a conductive layer formed of a translucent conductive material above the one main surface of the second substrate where the light shielding films are formed;
a step of forming a resist film formed of a photosensitive material on or above the conductive layer;
a step of exposing the resist film from an opposite main surface side which is located on a side opposite to the one main surface of the second substrate;
a step of exposing a part of the conductive layer by removing an exposed portion of the resist film; and
a step of forming the shield electrodes on or above the light shielding films by removing the exposed part of the conductive layer.

Assignees

• Sakai Hideaki
• Shima Nobuyuki
• Nishide Masahiko
• Kyocera Corp

Inventors

• Sakai Hideaki
• Shima Nobuyuki
• Nishide Masahiko

Classifications

• G02F2001/136295

  Physics · mapped topic

• G02F1/136209 Primary

  Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element · CPC title

• G02F2001/136218

  Physics · mapped topic

• G02F1/134363

  for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS] · CPC title

• G02F2001/13629

  Physics · mapped topic