Electroconductive film, and touch panel and display device provided with same

Patent metadata

Field	Value
Publication number	US-9891657-B2
Application number	US-201514667955-A
Country	US
Kind code	B2
Filing date	Mar 25, 2015
Priority date	Sep 27, 2012
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

An electroconductive film is provided on a display unit and has at least two wiring layers that are disposed on both sides of a transparent substrate or each disposed on either side of each of the at least two transparent substrates in a laminate form and are regularly arranged. A wiring pattern of the wiring layers is superimposed onto a pixel array pattern of the display unit, the wiring pattern of a lower layer being displaced in phase in relation to an upper layer. The electroconductive film satisfies: fm1≦fm2, when a first lowest frequency (fm1) is the lowest frequency of the moire spatial frequency, and a second lowest frequency (fm2) is the lowest frequency of the moire spatial frequency.

First claim

What is claimed is:

1. An electroconductive film installed on a display unit of a display device, comprising:
one or two or more transparent substrates; and
two or more wiring layers that are formed on both surfaces of the one transparent substrate or are each formed on one surface of each of the two or more transparent substrates, are disposed in a form of a laminate, and are regularly arranged,
wherein wiring patterns of the two or more wiring layers are superimposed on a pixel array pattern of the display unit, and a wiring pattern of a wiring layer as a lower layer is disposed at a displaced position in phase relative to a wiring pattern of a wiring layer as an upper layer,
wherein the two or more wiring layers each have a wiring pattern in a form of mesh in which a plurality of openings are arranged,
wherein the pixel array pattern comprises a black matrix pattern of the display unit,
wherein the electroconductive film satisfies:
fm1≦fm2

provided that among spatial frequencies of moire as obtained by convolution of spatial frequency characteristics of the wiring patterns of the two or more wiring layers and spatial frequency characteristics of the pixel array pattern of the display unit, a lowest frequency is set to a first lowest frequency fm1, and among spatial frequencies of moire as obtained by convolution of spatial frequency characteristics of a half of the wiring patterns of the two or more wiring layers and the spatial frequency characteristics of the pixel array pattern of the display unit, a lowest frequency is set to a second lowest frequency fm2,
wherein the spatial frequency characteristics of the wiring patterns of the two or more wiring layers comprise spatial frequency characteristics in a direction perpendicular to the one or two or more transparent substrates, and
wherein the spatial frequency characteristics of a half of the wiring patterns of the two or more wiring layers comprise spatial frequency characteristics in a direction inclined by a predetermined angle with respect to the one or two or more transparent substrates.

2. The electroconductive film according to claim 1 ,
wherein the two or more wiring layers are formed on both surfaces of the one transparent substrate.

3. The electroconductive film according to claim 1 ,
wherein the two or more transparent substrates are laminated on each other, the two or more wiring layers being each formed on one surface of each of the two or more transparent substrates.

4. A touch panel, comprising:
an electroconductive film; and
a detection control portion configured to detect, within a region where two or more wiring layers are formed, a position at which an object makes a contact with the electroconductive film from outside,
wherein the electroconductive film installed on a display unit of a display device, includes:
one or two or more transparent substrates; and
the two or more wiring layers that are formed on both surfaces of the one transparent substrate or are each formed on one surface of each of the two or more transparent substrates, are disposed in a form of a laminate, and are regularly arranged,

wherein wiring patterns of the two or more wiring layers are superimposed on a pixel array pattern of the display unit, and a wiring pattern of a wiring layer as a lower layer is disposed at a displaced position in phase relative to a wiring pattern of a wiring layer as an upper layer,
wherein the two or more wiring layers each have a wiring pattern in a form of mesh in which a plurality of openings are arranged,
wherein the pixel array pattern comprises a black matrix pattern of the display unit,
wherein the electroconductive film satisfies:
fm1≦fm2

provided that among spatial frequencies of moire as obtained by convolution of spatial frequency characteristics of the wiring patterns of the two or more wiring layers and spatial frequency characteristics of the pixel array pattern of the display unit, a lowest frequency is set to a first lowest frequency fm1, and among spatial frequencies of moire as obtained by convolution of spatial frequency characteristics of a half of the wiring patterns of the two or more wiring layers and the spatial frequency characteristic of the pixel array pattern of the display unit, a lowest frequency is set to a second lowest frequency fm2,
wherein the spatial frequency characteristics of the wiring patterns of the two or more wiring layers comprise spatial frequency characteristics in a direction perpendicular to the one or two or more transparent substrates, and
wherein the spatial frequency characteristics of a half of the wiring patterns of the two or more wiring layers comprises spatial frequency characteristics in a direction inclined by a predetermined angle with respect to the one or two or more transparent substrates.

5. A display device, comprising:
a display unit; and
an electroconductive film installed on the display unit,
wherein the electroconductive film includes:
one or two or more transparent substrates; and
two or more wiring layers that are formed on both surfaces of the one transparent substrate or are each formed on one surface of each of the two or more transparent substrates, are disposed in a form of a laminate, and are regularly arranged,

wherein wiring patterns of the two or more wiring layers are superimposed on a pixel array pattern of the display unit, and a wiring pattern of a layer as a lower layer is disposed at a displaced position in phase relative to a wiring pattern of a wiring layer as an upper layer,
wherein the two or more wiring layers each have a wiring pattern in a form of mesh in which a plurality of openings are arranged,
wherein the pixel array pattern comprises a black matrix pattern of the display unit,
wherein the electroconductive film satisfies:
fm1≦fm2

provided that among spatial frequencies of moire as obtained by convolution of spatial frequency characteristics of the wiring patterns of the two or more wiring layers and spatial frequency characterisitics of the pixel array pattern of the display unit, a lowest frequency is set to a first lowest frequency fm1, and among spatial frequencies of moire as obtained by convolution of spatial frequency characteristics of a half of the wiring patterns of the two or more wiring layers and the spatial frequency characteristics of the pixel array pattern of the display unit, a lowest frequency is set to a second lowest frequency fm2,
wherein the spatial frequency characteristics of the wiring patterns of the two or more wiring layers comprise spatial frequency characteristics in a direction perpendicular to the one or two or more transparent substrates, and
wherein the spatial frequency characteristics of a half of the wiring patterns of the two or more wiring layers comprise spatial frequency characteristics in a direction inclined by a predetermined angle with respect to the one or two or more transparent substrates.

Assignees

• Fujifilm Corp

Inventors

• Iwami Kazuchika

Classifications

• 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

• G06F3/041 Primary

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

• G06F3/045

  using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F1/16 Primary

  Constructional details or arrangements · CPC title