LIQUID CRYSTAL DISPLAY DEVICE

• US 20140285732A1
• Filed: 03/18/2014
• Published: 09/25/2014
• Est. Priority Date: 03/22/2013
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Tanabe, Toru, Fukutome, Takahiro, Moriya, Koji, Kurosaki, Daisuke, Ohno, Masakatsu
• Granted Patent: US 9,581,849 B2
• Time in Patent Office: Days
• US Class Current: 349/12
• CPC Class Codes: G02F 1/133334 Electromagnetic shields
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/1337 Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 1/137 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A liquid crystal display device that is not influenced by a noise in obtaining positional information can be provided. The liquid crystal display device includes a first substrate provided with a pixel electrode and a common electrode with a first insulating film interposed therebetween. The pixel electrode and the common electrode partly overlap with each other. The liquid crystal display device further includes a second substrate provided with a pair of electrodes, a resin film covering the pair of electrodes, and a conductive film on the resin film. The pair of electrodes partly overlap with each other with a second insulating film interposed therebetween. The liquid crystal display device further includes a liquid crystal layer between the conductive film on the second substrate side and the pixel electrode and the common electrode on the first substrate side. A predetermined potential is supplied to the conductive film.

Claims

1. A liquid crystal display device comprising:

a first substrate;

an element layer over the first substrate;

a common electrode over the element layer;

a first insulating film over the common electrode;

a pixel electrode over the first insulating film;

a liquid crystal layer over the pixel electrode;

a conductive film over the liquid crystal layer;

a resin film over the conductive film;

a first electrode over the resin film;

a second insulating film over the first electrode;

a second electrode over the second insulating film; and

a second substrate over the second electrode.

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

wherein the conductive film comprises at least one of indium oxide containing tungsten oxide, indium zinc oxide containing tungsten oxide, indium oxide containing titanium oxide, indium tin oxide containing titanium oxide, indium tin oxide, indium zinc oxide, zinc oxide, zinc oxide containing gallium, and indium tin oxide containing silicon oxide.

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

wherein the second substrate is a glass substrate or a plastic substrate.

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

wherein the element layer comprises a transistor including an oxide semiconductor.

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

wherein the oxide semiconductor comprises indium, gallium, and zinc.

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

wherein the conductive film is electrically connected to the common electrode.

7. The liquid crystal display device according to claim 1, further comprising an alignment film over the liquid crystal layer,

wherein the alignment film is in direct contact with the conductive film.

8. A liquid crystal display device comprising:

a first substrate provided with a pixel electrode and a common electrode;

a second substrate provided with a pair of electrodes, a resin film covering the pair of electrodes, and a conductive film; and

a liquid crystal layer between the pixel electrode and the conductive film,

wherein the resin film is between the conductive film and the pair of electrodes,

wherein the pixel electrode and the common electrode partly overlap with each other with a first insulating film interposed therebetween, and

wherein the pair of electrodes partly overlap with each other with a second insulating film interposed therebetween.

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

wherein the conductive film comprises at least one of indium oxide containing tungsten oxide, indium zinc oxide containing tungsten oxide, indium oxide containing titanium oxide, indium tin oxide containing titanium oxide, indium tin oxide, indium zinc oxide, zinc oxide, zinc oxide containing gallium, and indium tin oxide containing silicon oxide.

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

wherein the second substrate is a glass substrate or a plastic substrate.

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

wherein the first substrate is provided with a transistor including an oxide semiconductor, and

wherein the common electrode is over the transistor.

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

wherein the oxide semiconductor comprises indium, gallium, and zinc.

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

wherein a potential is supplied to the conductive film.

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

wherein the conductive film is electrically connected to the common electrode.

15. The liquid crystal display device according to claim 8, further comprising an alignment film between the liquid crystal layer and the conductive film,

wherein the alignment film is in direct contact with the conductive film.

16. A display device comprising:

a liquid crystal element comprising;

a pixel electrode;

a common electrode; and

a liquid crystal layer over the pixel electrode and the common electrode;

a touch panel over the liquid crystal element; and

a conductive film between the liquid crystal element and the touch panel.

17. The display device according to claim 16,

wherein the conductive film comprises at least one of indium oxide containing tungsten oxide, indium zinc oxide containing tungsten oxide, indium oxide containing titanium oxide, indium tin oxide containing titanium oxide, indium tin oxide, indium zinc oxide, zinc oxide, zinc oxide containing gallium, and indium tin oxide containing silicon oxide.

18. The display device according to claim 16,

wherein the conductive film is electrically connected to the common electrode.

19. The display device according to claim 16, further comprising an alignment film between the liquid crystal layer and the conductive film,

wherein the alignment film is in direct contact with the conductive film.