Conductive film, display device having the same, and method of evaluating conductive film

Patent metadata

Field	Value
Publication number	US-10101854-B2
Application number	US-201615331972-A
Country	US
Kind code	B2
Filing date	Oct 24, 2016
Priority date	May 2, 2014
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

In a conductive film, a wiring pattern is formed such that an indicator of evaluation of moirés is equal to or less than a predetermined value. In frequencies and intensities of moirés of the respective colors calculated from peak frequencies and peak intensities of respective two-dimensional Fourier spectra of transmittance image data and luminance image data of the sub-pixel array patterns of the respective colors, the indicator of evaluation is calculated from evaluation values of moirés obtained by applying human visual response characteristics in accordance with an observation distance to intensities of moirés at frequencies of moirés equal to or less than the maximum frequency of the moirés prescribed on the basis of a display resolution of the display unit.

First claim

What is claimed is:

1. A conductive film that is provided on a display unit of a display device, the conductive film comprising:
a transparent substrate; and
a conductive portion that is formed on at least one surface of the transparent substrate and has a plurality of thin metal lines,
wherein the plurality of thin metal lines has a wiring pattern formed in a mesh shape, and a plurality of opening portions is arrayed on the conductive portion,
wherein in the display unit, pixels, which include a plurality of sub-pixels emitting light with a plurality of colors that are at least three colors different from each other, are arrayed in pixel array patterns which are repeated in a certain direction and a direction perpendicular to the certain direction,
wherein the display unit satisfies at least any one of a condition in which forms of the sub-pixels for at least two colors different from each other among the plurality of colors are different, a condition in which cycles of sub-pixel array patterns formed by arrays of the sub-pixels having respective colors of the plurality of colors are different, or a condition in which at least one of barycenters of the plurality of sub-pixels within a single pixel of the pixels is at a position different from that of a straight line connecting at least two of the barycenters of the other sub-pixels,
wherein the conductive film is provided on the display unit such that the wiring pattern of the conductive portion overlaps the pixel array patterns of the display unit, and
wherein from at least one point of view, the wiring pattern is formed such that an indicator of evaluation of moirés is equal to or less than an evaluation threshold value, where in frequencies and intensities of the moirés of the respective colors calculated from a first peak frequency and a first peak intensity of a plurality of first spectrum peaks of two-dimensional Fourier spectra of transmittance image data of the wiring pattern and a second peak frequency and a second peak intensity of a plurality of second spectrum peaks of two-dimensional Fourier spectra of luminance image data of the sub-pixel array patterns of the respective colors of the plurality of colors, the indicator of evaluation is calculated from evaluation values of the moirés of the respective colors obtained by applying human visual response characteristics in accordance with an observation distance to intensities of the moirés equal to or greater than a first intensity threshold value among intensities of the moirés at frequencies of the moirés equal to or less than a frequency threshold value prescribed on the basis of a display resolution of the display unit.

2. The conductive film according to claim 1 ,
wherein the evaluation threshold value is −2.70, and
wherein the indicator of evaluation is equal to or less than −2.70 as a common logarithm.

3. The conductive film according to claim 1 , wherein the condition, in which the forms of the sub-pixels are different, includes a condition in which sizes or areas of the sub-pixels are different.

4. The conductive film according to claim 1 , wherein the condition, in which the cycles of the sub-pixel array patterns are different, includes a condition in which, assuming that, in a display screen of the display unit, the certain direction is a horizontal direction, the horizontal direction is an x direction, and a direction perpendicular to the x direction is a y direction, cycles of the sub-pixels for at least two colors different from each other do not coincide in at least one direction of the x direction or the y direction.

5. The conductive film according to claim 1 , wherein satisfying the at least any one condition is
satisfying any one of a condition in which, regarding any two colors of the plurality of colors, a difference between a position of a barycenter of the sub-pixel for one color and a position of a barycenter of the sub-pixel for the other color in the certain direction is less than 3P/10, a condition in which the difference is greater than 11P/30 and less than 3P/5, and a condition in which the difference is greater than 11P/15, where P is a pixel pitch of the pixel array patterns, or
satisfying any one of a condition in which, regarding any single color of the plurality of colors, a difference between a position of a barycenter of the sub-pixel for the single color and a position of a barycenter of the sub-pixel for the single color of an adjacent pixel in the direction perpendicular to the certain direction is less than 9P/10, and a condition in which the difference is greater than 11P/10.

6. The conductive film according to claim 1 , wherein the luminance image data of the sub-pixel array pattern of each color of the plurality of colors is normalized luminance data that is obtained by normalizing the luminance image data obtained by converting captured image data, which is obtained by capturing an image of the sub-pixel array pattern of a color displayed on the display screen of the display unit for each color, into luminance values.

7. The conductive film according to claim 6 ,
wherein the plurality of colors is three colors such as red, green, and blue,
wherein the image of the sub-pixel array pattern of the color displayed on the display screen of the display unit is displayed at a maximum luminance which can be set in the display unit, and
wherein the normalized luminance data of each color is normalized by a maximum luminance value of green.

8. The conductive film according to claim 7 ,
wherein the captured image data of the image of the sub-pixel array pattern of each color of red, green, and blue is image data that is obtained by imaging after adjusting white balance to a white color of a Macbeth chart,
wherein assuming that image data of red is R, image data of green is G, image data of blue is B, and a luminance value is Y, the image data R, G, and B of red, green, and blue is converted into a luminance value Y through the following Expression (1),
Y= 0.300 R+ 0.590 G+ 0.110 B   (1), and

wherein the luminance image data of each color is obtained by normalizing the maximum luminance value of green to 1.0.

9. The conductive film according to claim 7 ,
wherein the luminance image data of the image of the sub-pixel array pattern of each color of red, green, and blue is data that is obtained by setting an integral value, which is calculated by performing integration of a luminance of each XYZ color matching function on spectrum data of each color of red, green, and blue, as a value of mask data created from captured image data which is obtained by displaying each color of red, green, and blue on the sub-pixel of the color and by imaging the color through a microscope, where the spectrum data of each color of red, green, and blue is acquired by displaying each color of red, green, and blue on the sub-pixel of the color and measuring the color by a spectrometer, and
wherein the luminance image data of each color is obtained by normalizing the luminance image data of the maximum of green to 1.0.

10. The conductive film according to claim 1 ,
wherein the plurality of first spectrum peaks has a peak intensity that is equal to or greater than a first threshold value which is selected from a plurality of spectrum peaks obtained by performing two-dimensional Fourier transform on transmittance image data of the wiring pattern, and
wherein for each of the plurality of colors, the plurality of second spectrum peaks has a peak intensity that is equal to or greater than a second threshold value which is selected from a plurality of spectrum peaks obtained by performing two-dimensional Fourier transform on the luminance image data of the sub-pixel array pattern.

Assignees

• Fujifilm Corp

Inventors

• Iwami Kazuchika

Classifications

• G02F2203/69

  Arrangements or methods for testing or calibrating a device · CPC title

• G02F2201/52

  RGB geometrical arrangements · CPC title

• G02F2201/14

  asymmetric · CPC title

• H05K9/00

  Screening of apparatus or components against electric or magnetic fields (devices for absorbing radiation from an antenna H01Q17/00) · CPC title

• H01B5/14 Primary

  comprising conductive layers or films on insulating-supports · CPC title