Transparent laminate, capacitance type input device, and image display device

• US 9,632,639 B2
• Filed: 12/30/2014
• Issued: 04/25/2017
• Est. Priority Date: 07/03/2012
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Kanna, Shinichi, Saneto, Ryuji
• Primary Examiner(s): Sasinowski, Andrew
• Application Number:
  US14/585,298
• Publication Number:
  US 20150109252A1
• Time in Patent Office: 847 Days
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• 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 3/03547 Touch pads, in which fingers can move on a surface
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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

Abstract

Provided is a transparent laminate which does not have a problem in which a transparent electrode pattern is visually recognized, a capacitance type input device having the transparent laminate, and an image display device provided with the capacitance type input device as a constituent element. The transparent laminate of the invention includes a region where a transparent substrate, a first transparent film having a refractive index of 1.6 to 1.78 and a film thickness of 55 nm to 110 nm, a transparent electrode pattern, and a second transparent film having a refractive index of 1.6 to 1.78 and a film thickness of 55 nm to 110 nm are laminated in this order in a plane.

Claims

1. A transparent laminate,

wherein a region where a transparent substrate, a first transparent film which has a refractive index of 1.6 to 1.78 and a film thickness of 55 nm to 110 nm, a transparent electrode pattern, and a second transparent film which has a refractive index of 1.6 to 1.78 and a film thickness of 55 nm to 110 nm are laminated in this order is included in a plane,

wherein the first transparent film and the transparent electrode pattern are directly adjacent to each other, and

wherein the transparent electrode pattern and the second transparent film are directly adjacent to each other.

2. The transparent laminate according to claim 1,

wherein both of the transparent electrode pattern and a non-pattern region where the transparent electrode pattern is not formed are continuously covered with the first transparent film and the second transparent film directly or via another layer.

3. The transparent laminate according to claim 1,

wherein at least a part of the non-pattern region where the transparent electrode pattern is not formed includes a region where the transparent substrate, the first transparent film, and the second transparent film are laminated in this order in a plane.

4. The transparent laminate according to claim 3,

wherein the first transparent film and the second transparent film are adjacent to each other in the region where the transparent substrate, the first transparent film, and the second transparent film are laminated in this order.

5. The transparent laminate according to claim 1,

wherein a transparent protective film having a refractive index of 1.5 to 1.55 is further formed on a surface of the second transparent film opposite a surface on which the transparent electrode pattern is formed.

6. The transparent laminate according to claim 5,

wherein the thickness of the transparent protective film is 0.1 μ

m to 10 μ

m.

7. The transparent laminate according to claim 1,

wherein the first transparent film and the second transparent film are made of the same material.

8. The transparent laminate according to claim 1,

wherein the transparent substrate is a glass substrate having a refractive index of 1.5 to 1.55.

9. The transparent laminate according to claim 1,

wherein the transparent electrode pattern is an ITO film having a refractive index of 1.75 to 2.1.

10. The transparent laminate according to claim 1,

wherein at least one of the first transparent film and the second transparent film is a transparent resin film.

11. The transparent laminate according to claim 10,

wherein the transparent resin film has at least one of ZrO₂ particles and TiO₂ particles.

12. The transparent laminate according to claim 1,

wherein at least one of the first transparent film and the second transparent film is formed by transferring a transparent curable resin film formed on a temporary support onto the transparent substrate.

13. The transparent laminate according to claim 1,

wherein at least one of the first transparent film and the second transparent film is formed by sputtering.

14. The transparent laminate according to claim 1,

wherein at least one of the first transparent film and the second transparent film is a mixed film of SiO₂ and Nb₂O₅ formed by sputtering.

15. The transparent laminate according to claim 1,

wherein an end portion of the transparent electrode pattern has a tapered shape having an angle of 30°

or smaller.

16. The transparent laminate according to claim 1,

wherein a third transparent film having a refractive index of 1.5 to 1.52 is included between the transparent substrate and the first transparent film.

17. A capacitance type input device comprising:

the transparent laminate according to claim 1.

18. An image display device comprising:

the capacitance type input device according to claim 17 as a constituent element.

19. The transparent laminate according to claim 1,

wherein the transparent substrate and the first transparent film are directly adjacent to each other.

20. A transparent laminate,

wherein a region where a transparent substrate, a first transparent film which has a refractive index of 1.6 to 1.78 and a film thickness of 55 nm to 110 nm, a transparent electrode pattern, and a second transparent film which has a refractive index of 1.6 to 1.78 and a film thickness of 55 nm to 110 nm are laminated in this order is included in a plane,

wherein a transparent protective film is formed on a surface of the second transparent film opposite a surface on which the transparent electrode pattern is formed,

wherein the transparent protective film is obtained by curing a photosensitive layer,

wherein a thickness of the transparent protective film is 0.1 μ

m to 10 μ

m, and

wherein the second transparent film and the transparent protective film are directly adjacent to each other.