Input-capable display device

• US 9,069,401 B2
• Filed: 12/14/2007
• Issued: 06/30/2015
• Est. Priority Date: 01/30/2007
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Utsunomiya, Sumio, Koshihara, Takeshi, Ushiki, Takeyoshi, Fujikawa, Yoichi
• Primary Examiner(s): Moon, Seokyun
• Application Number:
  US11/957,047
• Publication Number:
  US 20080180407A1
• Time in Patent Office: 2,755 Days
• Field of Search: 345173-179, 349/12, 178 1801- 1806
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133784 by rubbing
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• 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 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/136218 Shield electrodes
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

An input-capable display device includes a first substrate, a second substrate, a detection electrode, a dielectric film, and a detector. A pair of electrodes that drive a liquid crystal layer are provided on the first substrate. The second substrate is opposed to the first substrate through the liquid crystal layer. The detection electrode and the dielectric film are laminated on an outer surface of the second substrate. The detector detects a position at which an electrostatic capacitance is formed with the detection electrode through the dielectric film. The second substrate includes a shield conductor that is formed on a side adjacent to the liquid crystal layer. An electric potential of the shield conductor is fixed.

Claims

1. An input-capable display device comprising:

a first substrate on which a pair of electrodes that drive a liquid crystal layer are provided;

a second substrate that is opposed to the first substrate through the liquid crystal layer, wherein the liquid crystal layer is formed within an inner surface of the second substrate between the first substrate and the second substrate;

a detection electrode and a dielectric film that are laminated on an outer surface of the second substrate;

a detector that detects a position at which an electrostatic capacitance is formed with the detection electrode through the dielectric film;

a shield conductor spaced apart from the detection electrode at a distance so as to be capable of preventing a capacitance component forming between the shield conductor and the detection electrode, the shield conductor formed on the inner surface of the second substrate such that the shield conductor is sandwiched between the second substrate and the liquid crystal layer;

a light shielding film; and

a color filter layer,

wherein the pair of electrodes provided on the first substrate comprises a pixel electrode and a common electrode,

wherein an electric potential of the shield conductor is fixed, and

wherein the shield conductor, the light shielding film, and the color filter layer are laminated on the inner surface of the second substrate in order of the shield conductor, the light shielding film, and the color filter layer from the side of the second substrate toward the liquid crystal layer.

2. The input-capable display device according to claim 1, wherein the shield conductor has translucency.

3. The input-capable display device according to claim 1, wherein the dielectric film constitutes a polarizer.

4. The input-capable display device according to claim 1, wherein the pair of electrodes constitute a horizontal electric field mode structure.

5. The input-capable display device according to claim 1, wherein the pair of electrodes are arranged on different layers of the first substrate.

6. The input-capable display device according to claim 1, wherein the detection electrode is sandwiched directly between the second substrate and the dielectric film.

7. The input-capable display device according to claim 1, wherein a thickness of the second substrate between the inner surface of the second substrate and the outer surface of the second substrate is at least equal to the distance so as to be capable of preventing the capacitance component forming between the shield conductor and the detection electrode.

8. The input cable display device according to claim 1, wherein the shield electrode has a sheet resistance of 1 kΩ

/sq or below.