Conductive film and touch panel including the same

Patent metadata

Field	Value
Publication number	US-9459741-B2
Application number	US-201414309481-A
Country	US
Kind code	B2
Filing date	Jun 19, 2014
Priority date	Jun 20, 2013
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

A conductive film may be provided that includes a base member, a first hard coating layer formed on a surface of the base member, and a conductive layer formed on the first hard coating layer. The conductive layer may include conductors composed of a nano-material forming a network structure.

First claim

What is claimed is:

1. A conductive film comprising:
a base member;
a first hard coating layer on a first surface of the base member;
a conductive layer directly on and in contact with the first hard coating layer,
a primer layer provided between the first hard coating layer and the base member, the first hard coating layer provided between the base member and the conductive layer,
the first hard coating layer provided between the base member and the conductive layer,
and the conductive layer includes a plurality of conductors composed of nano-material to form a network structure,
and an over-coating layer on the conductive layer to cover the conductors of the conductive layer,
wherein the plurality of conductors are nanowires,
wherein a surface roughness of the first hard coating layer, adjacent to the conductive layer, is less than a surface roughness of the first surface of the base member,
wherein a thickness of the primer layer is less than a thickness of the first hard coating layer,
wherein the thickness of the first hard coating layer is configured to have a pencil hardness of 1H to 5H,
and wherein the thickness of the primer layer is configured to have a pencil hardness of less than that of the first hard coating layer.

2. The conductive film according to claim 1 , further comprising at least one of a second hard coating layer on a second surface of the base member.

3. The conductive film according to claim 2 , wherein the conductive film includes the second hard coating layer and the primer layer, and
a stack that includes the base member, the primer layer, the first hard coating layer and the second hard coating layer has a haze of 0.1% to 0.4%.

4. The conductive film according to claim 1 , wherein the first hard coating layer includes an acrylic material.

5. The conductive film according to claim 1 , wherein the thickness of the first hard coating layer is less than a thickness of the base member, and the thickness of the first hard coating layer is greater than a thickness of the conductive layer.

6. The conductive film according to claim 1 , wherein the thickness of the first hard coating layer is within a range of 1 μm to 10 μm.

7. The conductive film according to claim 1 , wherein the conductive film includes a conductive region and a non-conductive region, and
the conductive film is provided such that the conductive region includes the conductive layer and the over-coating layer, and the non-conductive region is provided without the conductive layer and the over-coating layer.

8. The conductive film according to claim 1 , further comprising an over-coating layer to cover the conductors of the conductive layer,
wherein the conductive film includes a conductive region and a non-conductive region, and
a void is provided in the non-conductive region based on removal of the conductors in the conductive layer.

9. The conductive film according to claim 1 , further comprising an over-coating to cover the conductors of the conductive layer,
wherein the conductive layer includes a residual portion, and the conductors have a thickness greater than the residual portion and extending or protruding to outside of the residual portion, and
the over-coating layer covers the conductors extending to the outside of the residual portion.

10. The conductive film according to claim 1 , wherein:
a contact angle between the first hard coating layer and water is 40 degrees to 60 degrees,
or a surface tension of water on the first hard coating layer is 20 dyne/cm to 50 dyne/cm.

11. A touch panel including the conductive film according to claim 1 .

12. A touch panel comprising:
a first conductive film comprising a base member,
a primer layer on the base member,
a first hard coating layer on the primer layer,
a first conductive layer directly on and in contact with the first hard coating layer,
and an over-coating layer on the first conductive layer,
the first hard coating layer provided between the base member and the first conductive layer,
the first conductive layer includes a plurality of conductors composed of nano-material to form a network structure,
and the over-coating layer to cover the conductors of the first conductive layer;
a second conductive layer constituting a second electrode that is different from the first conductive layer; and
a cover substrate for covering the first conductive film and the second conductive layer, wherein the cover substrate being a separate member from the first conductive film,
wherein the first conductive layer includes a conductive region,
and the conductive region of the first conductive layer includes a conductive portion in which the conductors are provided and a non-conductive portion in which the conductors are not provided,
wherein the plurality of conductors are nanowires, and
wherein a surface roughness of the first hard coating layer, adjacent to the first conductive layer, is less than a surface roughness of the first surface of the base member
wherein the primer layer is between and in contact with the base member and the first hard coating layer,
wherein a thickness of the primer layer is less than a thickness of the first hard coating layer,
wherein the thickness of the first hard coating layer is configured to have a pencil hardness of 1H to 5H,
and wherein the thickness of the primer layer is configured to have a pencil hardness of less than that of the first hard coating layer.

13. The touch panel according to claim 12 , wherein the first conductive layer has a resistance of 10 Ω/m 2 to 150 Ω/m 2 , and
a ratio of an area of the conductive region to a total area of the conductive region of the first conductive layer is 0.05 to 0.95.

14. The touch panel according to claim 13 , further comprising:
at least one transparent adhesion layer positioned at at least one of a portion between the first conductive layer and the second conductive layer and another portion between the cover substrate and the first conductive layer or the second conductive layer,
wherein the transparent adhesion layer has a thickness of 25 um to 160 um.

15. The touch panel according to claim 12 , wherein a total number of the conductors is at least 20 and a total number of contact points at which the conductors contact is at least 5 in a unit area having a width of 10 μm and a length of 10 μm in the conductive region of the first conductive layer.

16. The touch panel according to claim 15 , wherein the total number of the conductors is within a range of 20 to 1,000, and the total number of contact points is within a range of 5 to 10,000 in the unit area having the width of 10 μm and the length of 10 μm in the conductive region of the first conductive layer.

17. The touch panel according to claim 12 , wherein the first conductive layer has a thickness of 50 nm to 350 nm.

18. The touch panel according to claim 12 , further comprising:
at least one transparent adhesion layer positioned at at least one of a portion between the first conductive layer and the second conductive layer and another portion between the cover substrate and the first conductive layer or the second conductive layer,
wherein a ratio of a thickness of the first conductive layer to a thickness of the transparent adhesion layer is a 0.00033 to 0.014.

Assignees

• Lg Electronics Inc

Inventors

• Kim Yuhee
• Hur Yangwook
• Choi Jinyoung
• Lee Munsu

Classifications

• H05K1/097

  Inks comprising nanoparticles and specially adapted for being sintered at low temperature (H05K1/095 takes precedence) · CPC title

• G06F2203/04112

  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 title

• G06F3/044 Primary

  by capacitive means · CPC title

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• G06F3/0446 Primary

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title