Display device, touch detection device and electronic apparatus

• US 9,158,421 B2
• Filed: 10/09/2012
• Issued: 10/13/2015
• Est. Priority Date: 10/14/2011
• Status: Active Grant

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Japan Display Incorporated
• Inventors: Kurasawa, Hayato, Ishizaki, Koji, Azumi, Kohei
• Primary Examiner(s): HALEY, JOSEPH R
• Application Number:
  US13/647,988
• Publication Number:
  US 20130093706A1
• Time in Patent Office: 1,099 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• 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
• CPC Class Codes: G06T 5/20 using local operators
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 3/2074 using sub-pixels
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A display device includes: a display layer; plural first electrodes formed to be arranged above the display layer; a shield electrode formed apart from the plural first electrodes so as to surround the whole plural first electrodes along an arrangement surface; an insulating layer; and a semiconductive layer formed opposite to the first electrodes and the shield electrode so as to sandwich the insulating layer, wherein the difference between an average potential of the first electrodes and an average potential of the shield electrode is equal to or less than 0.5V.

Claims

1. A display device comprising:

a display layer;

a transparent substrate arranged above the display layer;

plural first electrodes arranged on the transparent substrate;

a shield electrode arranged on the transparent substrate, the shield electrode being apart from the plural first electrodes so as to surround the whole plural first electrodes along an arrangement surface,

an insulating layer arranged on the plural first electrodes and the shield electrode; and

a semiconductive layer arranged on the insulating layer,

wherein the insulating layer is arranged between the semiconductive layer and a layer including the plural first electrodes and the shield electrode, and

the difference between an average potential of the first electrodes and an average potential of the shield electrode is equal to or less than 0.5V.

2. The display device according to claim 1,

wherein the average potential of the shield electrode is equal to or higher than the average potential of the first electrodes.

3. The display device according to claim 2,

wherein the average potential of the shield electrode is approximately the same as the average potential of the first electrodes.

4. The display device according to claim 2,

wherein an arrangement area of the shield electrode is smaller than an arrangement area of the first electrodes.

5. The display device according to claim 1,

wherein the semiconductive layer is an electrostatic prevention layer.

6. The display device according to claim 1,

wherein the semiconductive layer is a polarizing plate.

7. The display device according to claim 1, further comprising:

second electrodes formed at the same position as the first electrode or a position farther from the semiconductive layer so as to sandwich the insulating layer.

8. The display device according to claim 7,

wherein the first electrodes are touch detection electrodes transmitting signals corresponding to contact/non-contact and the second electrodes are drive electrodes forming capacitance between the second electrodes and the touch detection electrodes.

9. The display device described according to claim 7,

wherein the second electrodes are touch detection electrodes transmitting signals corresponding to contact/non-contact and the first electrodes are drive electrodes forming capacitance between the first electrodes and the touch detection electrodes.

10. The display device according to claim 7,

wherein the difference between an average potential of the second electrodes and an average potential of the shield electrode is equal to or less than 0.5V.

11. The display device according to claim 8,

wherein the display section has

a liquid crystal layer,

pixel electrodes formed between the liquid crystal layer and the drive electrodes, or arranged opposite to the liquid crystal layer so as to sandwich the drive electrodes.

12. The display device according to claim 8,

wherein the display section has

a liquid crystal layer and

pixel electrodes arranged opposite to the drive electrode so as to sandwich the liquid crystal layer.

13. The display device according to claim 1,

wherein the first electrodes are touch detection electrodes transmitting signals corresponding to contact/non-contact.

14. A display device comprising:

a display layer;

a transparent substrate arranged above the display layer;

plural first electrodes arranged on the transparent substrate;

a shield electrode arranged on the transparent substrate, the shield electrode being apart from the plural first electrodes so as to surround the whole plural first electrodes along an arrangement surface;

an insulating layer arranged on the plural first electrode and the shield electrode; and

a semiconductive layer arranged on the insulating layer,

wherein the insulating layer is arranged between the semiconductive layer and a layer including the plural first electrode and the shield electrode, and

an average potential of the shield electrode is equal to or higher than an average potential the first electrodes.

15. A touch detection device comprising:

a transparent substrate arranged above the display layer;

plural first electrodes arranged on the transparent substrate;

a shield electrode arranged on the transparent substrate, the shield electrode being apart from the plural first electrodes so as to surround the whole plural first electrodes along an arrangement surface;

an insulating layer arranged on the plural first electrode and the shield electrode; and

a semiconductive layer arranged on the insulating layer,

wherein the insulating layer is arranged between the semiconductive layer and a layer including the plural first electrodes and the shield electrode, and

the difference between an average potential of the first electrodes and an average potential of the shield electrode is equal to or less than 0.5V.

16. An electronic apparatus comprising:

a display device; and

a control unit performing operation control using the display device,

wherein the display device includes

a display layer,

a transparent substrate arranged above the display layer;

plural first electrodes arranged on the transparent substrate,

a shield electrode arranged on the transparent substrate, the shield electrode being apart from the plural first electrodes so as to surround the whole plural first electrodes along an arrangement surface,

an insulating layer arranged on the plural first electrodes and the shield electrode, and

a semiconductive layer arranged on the insulating layer,

the insulating layer is arranged between the semiconductive layer and a layer including the plural first electrodes and the shield electrode, and

the difference between an average potential of the first electrodes and an average potential of the shield electrode is equal to or less than 0.5V.