Contact sensitive device, display apparatus including the same and method of manufacturing display apparatus

• US 10,133,352 B2
• Filed: 11/18/2016
• Issued: 11/20/2018
• Est. Priority Date: 12/31/2015
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lee, YongWoo, Ham, Yong-Su, Kim, Taeheon, Kho, YuSeon, Lim, MyungJin, Choi, Seulgi
• Primary Examiner(s): Sharifi-Tafreshi, Koosha
• Application Number:
  US15/355,922
• Publication Number:
  US 20170192507A1
• Time in Patent Office: 732 Days
• CPC Class Codes: B29C 65/4845 Radiation curing adhesives, e.g. UV light curing adhesives
• CPC Class Codes: B29L 2031/3475 Displays, monitors, TV-sets, computer screens
• CPC Class Codes: B32B 2038/0076 Curing, vulcanising, cross-linking
• CPC Class Codes: B32B 2307/20 having particular electrical or magnetic properties, e.g. piezoelectric
• CPC Class Codes: B32B 2310/0831 using UV radiation
• CPC Class Codes: B32B 2457/208 Touch screens
• CPC Class Codes: B32B 37/12 characterised by using adhesives
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/016 Input arrangements with force or tactile feedback as computer generated output to the user
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display

Abstract

Provided is a contact sensitive device. The contact sensitive device includes an electroactive layer, a plurality of first electrodes, a plurality of second electrodes, and a bonding layer. The plurality of first electrodes is disposed on one surface of the electroactive layer and the plurality of second electrodes is disposed on the other surface of the electroactive layer. The bonding layer covers one surface of the electroactive layer and consists of a first part corresponding to the plurality of first electrodes and a second part excluding the first part. The first part and the second part of the bonding layer have different elastic moduli.

Claims

1. A contact sensitive device, comprising:

an electroactive layer;

a plurality of first electrodes on one surface of the electroactive layer;

a plurality of second electrodes on another surface of the electroactive layer; and

a bonding layer on the one surface of the electroactive layer, the bonding layer including a first part corresponding to the plurality of first electrodes and a second part excluding the first part,

wherein the first part and the second part have different elastic modulus.

2. The contact sensitive device according to claim 1, wherein the first part and the second part are one continuous layer.

3. The contact sensitive device according to claim 1, wherein an elastic modulus of the first part is higher than an elastic modulus of the second part.

4. The contact sensitive device according to claim 1, wherein an elastic modulus of the first part is 20 to 500 times higher than an elastic modulus of the second part.

5. The contact sensitive device according to claim 1, wherein an elastic modulus of the first part is 10 MPa to 60 MPa.

6. The contact sensitive device according to claim 5, wherein an elastic modulus of the second part is 0.05 MPa to 0.50 MPa.

7. The contact sensitive device according to claim 6, wherein a pencil hardness of the first part is 5B or higher and a pencil hardness of the second part is 3B or lower.

8. The contact sensitive device according to claim 1, wherein the first part of the bonding layer corresponds to an overlapping area where the plurality of first electrodes and the plurality of second electrodes overlap with each other.

9. A display apparatus, comprising:

a display panel;

a contact sensitive device on the display panel, the contact sensitive device including an electroactive layer, a first electrode on one surface of the electroactive layer, and a bonding layer on the first electrode; and

a cover window on the contact sensitive device,

wherein the bonding layer includes a first part between the first electrode and the cover window and a second part between the one surface of the electroactive layer and the cover window, and

wherein the first part and the second part have different elastic moduli.

10. The display apparatus according to claim 9, wherein an elastic modulus of the first part is higher than an elastic modulus of the second part.

11. The display apparatus according to claim 9, wherein an elastic modulus of the first part is 20 to 500 times higher than an elastic modulus of the second part.

12. The display apparatus according to claim 9, wherein an adhesive strength of the bonding layer is 4 N/cm² or higher.

13. The display apparatus according to claim 9, wherein a thickness of the bonding layer is 20 μ

m to 100 μ

m.

14. The display apparatus according to claim 9, further comprising:

a touch device between the contact sensitive device and the cover window, between the contact sensitive device and the display panel, or in the display panel.