Display device with capacitive touch panel, capacitive touch panel

• US 10,353,520 B2
• Filed: 11/07/2012
• Issued: 07/16/2019
• Est. Priority Date: 11/07/2011
• Status: Active Grant

• Current Assignee: Oji Holdings Corporation
• Original Assignee: Oji Holdings Corporation
• Inventors: Takakusagi, Emi, Miyazaki, Sakura, Matsubayashi, Satoru
• Primary Examiner(s): Sitta, Grant
• Application Number:
  US14/364,042
• Publication Number:
  US 20150015812A1
• Time in Patent Office: 2,442 Days
• Field of Search: 345173-175
• CPC Class Codes: B32B 2307/202 Conductive
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: B32B 2457/20 Displays, e.g. liquid crystal displays, plasma displays
• CPC Class Codes: B32B 2457/202 LCD, i.e. liquid crystal displays
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0444 using a single conductive element covering the whole sensing surface, e.g. by sensing the electrical current flowing at the corners

Abstract

A display device with a capacitive touch panel including a liquid crystal display having a polarizing plate disposed on a top surface thereof; and a capacitive touch panel which is disposed in front of the liquid crystal display such that a gap is provided between the touch panel and the polarizing plate, and has an outer edge which is fixed to the liquid crystal display via an adhesive layer therebetween. The touch panel includes a transparent substrate, a conductive layer which is provided on the side of the liquid crystal display of the transparent substrate, and a protective sheet which is laminated on the conductive layer via an adhesive layer, and a surface of the protective sheet opposed to the liquid crystal display is an irregular surface having minute irregularities, and the irregular surface has a surface roughness of 1.5 nm to 400 nm.

Claims

1. A display device with a capacitive touch panel comprising:

a display unit; and

a capacitive touch panel which is disposed in front of the display unit such that a gap is provided between the capacitive touch panel and the display unit,

wherein the capacitive touch panel has an outer edge which is fixed to the display unit via an adhesive layer therebetween,

wherein the capacitive touch panel is configured to contact the display unit when pressed by a finger,

wherein the capacitive touch panel comprises one transparent substrate made of glass, a conductive film which is formed on the transparent substrate on a side facing the display, and a protective sheet which is laminated on the conductive film via an adhesive layer,

wherein the protective sheet comprises a base material and a hard coating layer which has a haze of less than 1% as measured in accordance with JIS-K7136 and is provided on the base material on its side facing the display, and the hard coating layer has a surface having a surface roughness of 1.5 nm to 400 nm, thereby preventing the capacitive touch panel from staying adhered to the display unit when the finger pressing the display unit is released from the display unit, and

wherein the surface is opposed to the display unit.

4. The display device with a capacitive touch panel according to claim 1, wherein the hard coating layer has a surface having a surface roughness of 3 nm to 400 nm.

6. The display device with a capacitive touch panel according to claim 1, wherein the hard coating layer has a surface having a surface roughness of 50 nm to 400 nm.

8. The display device with a capacitive touch panel according to claim 1, further comprising a protective film on the conductive layer for preventing oxidation of the conductive layer.

11. The display device with a capacitive touch panel according to claim 4, further comprising a protective film on the conductive layer for preventing oxidation of the conductive layer.

13. The display device with a capacitive touch panel according to claim 6, further comprising a protective film on the conductive layer for preventing oxidation of the conductive layer.

15. The display device with a capacitive touch panel according to claim 1, wherein the hard coating layer is a cured form of a hard coating layer forming composition containing a multifunctional (meth)acrylic monomer and particles.

17. The display device with a capacitive touch panel according to claim 1, wherein the hard coating layer is a cured form of a hard coating layer forming composition containing two or more resin components having different solubility parameter (SP) values.

19. The display device according to claim 1, wherein the transparent substrate is made of tempered glass.

2. A capacitive touch panel which is disposed in front of a display unit such that a gap is provided between the capacitive touch panel and the display unit, and has an outer edge which is fixed to the display unit via an adhesive layer therebetween, and is configured to contact the display unit when pressed by a finger, and the capacitive touch panel comprising:

one transparent substrate;

a conductive film which is formed on the transparent substrate; and

a protective sheet which is laminated on the conductive film via an adhesive layer,

wherein the protective sheet comprises a base material and a hard coating layer which has a haze of less than 1% as measured in accordance with JIS-K7136 and is provided on the base material on its side facing the display, and the hard coating layer has a surface having a surface roughness of 1.5 nm to 400 nm thereby preventing the capacitive touch panel from staying adhered to the display unit when the finger pressing the display unit is released from the display unit, and

wherein the surface is opposed to the display unit.

3. The capacitive touch panel according to claim 2, further comprising:

a second conductive layer which is opposed to the display unit side of the transparent substrate; and

a protective sheet which is laminated on the second conductive layer via an adhesive layer.

5. The capacitive touch panel according to claim 2, wherein the hard coating layer has a surface having a surface roughness of 3 nm to 400 nm.

7. The capacitive touch panel according to claim 2, wherein the surface of the hard coating layer has a surface having a surface roughness of 50 nm to 400 nm.

9. The capacitive touch panel according to claim 2, further comprising a protective film on the conductive layer for preventing oxidation of the conductive layer.

10. The capacitive touch panel according to claim 3, further comprising a protective film on the conductive layer for preventing oxidation the conductive layer.

12. The capacitive touch panel according to claim 5, further comprising a film firm on the conductive layer for preventing oxidation of the conductive layer.

14. The capacitive touch panel according to claim 7, further comprising a protective film on the conductive layer for preventing oxidation of the conductive layer.

16. The capacitive touch panel according to claim 2, wherein the hard coating layer is a cured form of a hard coating layer forming composition containing a multifunctional (meth)acrylic monomer and particles.

18. The capacitive touch panel according to claim 2, wherein the hard coating layer is a cured form of a hard coating layer forming composition containing two or more resin components having different solubility parameter (SP) values.