Conductive sheet, touch panel, display device, method for producing conductive sheet, and recording medium
First Claim
1. A conductive sheet, comprising:
- a base; and
a conductive portion that is formed on at least one main surface of the base and is formed from a plurality of thin metal wires, whereina mesh pattern in which different mesh shapes are arrayed in plan view is formed by the conductive portion, andthe mesh pattern is configured sothat a two-dimensional power spectrum of a centroid position distribution of the mesh shapes is given, such that an average intensity on a spatial frequency band side higher than a predetermined spatial frequency is larger than an average intensity on a spatial frequency band side lower than the predetermined spatial frequency, andthat a centroid position distribution of the mesh shapes is given such that, a root mean square deviation of each centroid positions of the mesh shapes which are disposed along a predetermined direction with respect to a direction perpendicular to the predetermined direction is equal to or greater than 15 μ
m and equal to or less than 65 μ
m.
1 Assignment
0 Petitions
Accused Products
Abstract
The conductive sheet according to the present invention includes a base and a conductive portion that is formed on at least one main surface of the base and is formed from a plurality of thin metal wires, where a mesh pattern in which different mesh shapes are arrayed in plan view is formed by the conductive portion, and the mesh pattern is configured such that, in a power spectrum of a two-dimensional distribution of centroid positions of the mesh shapes, an average intensity on a higher spatial frequency band side than a predetermined spatial frequency is larger than an average intensity on a lower spatial frequency band side than the predetermined spatial frequency. The conductive sheet can reduce the granular feeling of noise due to pattern which the conductive sheet has and greatly improve the visibility of an object for observation.
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Citations
19 Claims
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1. A conductive sheet, comprising:
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a base; and a conductive portion that is formed on at least one main surface of the base and is formed from a plurality of thin metal wires, wherein a mesh pattern in which different mesh shapes are arrayed in plan view is formed by the conductive portion, and the mesh pattern is configured so that a two-dimensional power spectrum of a centroid position distribution of the mesh shapes is given, such that an average intensity on a spatial frequency band side higher than a predetermined spatial frequency is larger than an average intensity on a spatial frequency band side lower than the predetermined spatial frequency, and that a centroid position distribution of the mesh shapes is given such that, a root mean square deviation of each centroid positions of the mesh shapes which are disposed along a predetermined direction with respect to a direction perpendicular to the predetermined direction is equal to or greater than 15 μ
m and equal to or less than 65 μ
m. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for producing a conductive sheet, comprising:
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a generation step of generating image data representing a design of a mesh pattern in which different mesh shapes are arrayed; a calculation step of calculating an evaluation value, which quantifies a degree of variation of centroid positions of the mesh shapes, based on the generated image data; a determination step of determining a piece of the image data as output image data based on the calculated evaluation value and predetermined evaluation conditions; and an output step of obtaining a conductive sheet, in which the mesh pattern is formed on a base in plan view, by outputting and forming a conductive wire on the base based on the determined output image data, wherein, in the calculation step, a predetermined spatial frequency is set, an average intensity on a spatial frequency band side higher than the predetermined spatial frequency and an average intensity on a spatial frequency band side lower than the predetermined spatial frequency are calculated based on the two-dimensional power spectrum of a centroid position distribution of the mesh shapes obtained based on the generated image data, and a trail to calculate a root mean square deviation (RMS) of each centroid positions of the mesh shapes and arbitrarily selected which are disposed along a predetermined direction with respect to a direction perpendicular to the predetermined direction based on the generated image data is repeated to obtain the RMS in each trial and the average value (RMSave) thereof and the evaluation value (EV) is calculated by using the RMS and the RMSave, and wherein, in the determining step, a piece of the image data is determined such that, the average intensity on the spatial frequency band side higher than the predetermined spatial frequency is larger than the average intensity on the spatial frequency band side lower than the predetermined spatial frequency, and the evaluation value (EV) is equal to or greater than 15 μ
m and equal to or less than 65 μ
m. - View Dependent Claims (18)
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17. A non-transitory computer-readable recording medium that records a program causing a computer to execute as a procedure:
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a generation step of generating image data representing a design of a mesh pattern in which different mesh shapes are arrayed; a calculation step of calculating an evaluation value, which quantifies a degree of variation of centroid positions of the mesh shapes, based on the generated image data; and a determination step of determining a piece of the image data as output image data based on the calculated evaluation value and predetermined evaluation conditions, wherein, in the calculation step, a predetermined spatial frequency is set, an average intensity on a spatial frequency band side higher than the predetermined spatial frequency and an average intensity on a spatial frequency band side lower than the predetermined spatial frequency are calculated based on the two-dimensional power spectrum of a centroid position distribution of the mesh shapes obtained based on the generated image data, and a trail to calculate a root mean square deviation (RMS) of each centroid positions of the mesh shapes and arbitrarily selected which are disposed along a predetermined direction with respect to a direction perpendicular to the predetermined direction based on the generated image data is repeated to obtain the RMS in each trial and the average value (RMSave) thereof and the evaluation value (EV) is calculated by using the RMS and the RMSave, and wherein, in the determining step, a piece of the image data is determined such that, the average intensity on the spatial frequency band side higher than the predetermined spatial frequency is larger than the average intensity on the spatial frequency band side lower than the predetermined spatial frequency, and the evaluation value (EV) is equal to or greater than 15 μ
m and equal to or less than 65 μ
m. - View Dependent Claims (19)
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Specification