CN212675532U - Electrode member for touch panel, and image display device - Google Patents

Abstract

The utility model provides an electrode part, touch panel and image display device for touch panel. The electrode member for a touch panel has, in a plan view, a plurality of cell mesh patterns (MP3) which are laid over by a plurality of 1 st metal thin lines (MW1, MW3) extending in a 1 st direction (D1) intersecting a plurality of 2 nd metal thin lines (MW2, MW4) extending in a 2 nd direction, a straight line (L1) connecting center points (C1, C2) of the 2 unit mesh patterns (MP3) adjacent in the 1 st direction (D1) extends in a direction (D3) intersecting the 1 st direction (D1), and a straight line connecting center points of the 2 unit mesh patterns (MP3) adjacent in the 2 nd direction extends in a direction intersecting the 2 nd direction.

Description

Electrode member for touch panel, and image display device

Technical Field

The present invention relates to an electrode member for a touch panel used as an electrode of a touch sensor or a touch panel.

The present invention also relates to a touch panel including the electrode member for a touch panel.

Further, the present invention relates to an image display device including a touch panel.

Background

In recent years, in various electronic devices including mobile information devices such as tablet computers and smartphones, touch panels are becoming popular which are used in combination with display devices such as liquid crystal display devices and perform input operations to the electronic devices by bringing a finger, a stylus pen, and the like into contact with or close to a screen.

A touch panel uses a conductive member in which a detection portion for detecting a touch operation by a contact or an approach of a finger, a stylus pen, or the like is formed on a transparent substrate.

The detecting part is formed of a transparent conductive Oxide such as ITO (Indium Tin Oxide), but may be formed of a metal other than the transparent conductive Oxide. Metals have advantages such as easier patterning, more excellent flexibility, and lower resistance than the transparent conductive oxides, and therefore metals such as copper and silver are used for conductive thin lines in touch panels and the like.

Patent document 1 describes a touch panel in which a detection electrode composed of a plurality of thin metal wires is disposed on a transparent substrate. The detection electrode has a plurality of 1 st metal thin lines extending in a 1 st direction and a plurality of 2 nd metal thin lines extending in a 2 nd direction different from the 1 st direction, and a plurality of diamond-shaped mesh patterns are formed by the plurality of 1 st metal thin lines and the plurality of 2 nd metal thin lines. The 1 st metal thin wires are arranged so as to be shifted in the 2 nd direction on both sides of the intersection with the 2 nd metal thin wires.

Patent document 1: U.S. patent application publication No. 2014/0216783 specification

When a touch panel having a plurality of regular grid patterns formed of fine metal wires is used as an image display device by being disposed on a liquid crystal display or the like for displaying an image, so-called moire is conspicuous and visually recognized due to interference between the plurality of regular grid patterns and a pixel pattern of the liquid crystal display or the like.

In the touch panel of patent document 1, since the plurality of 1 st fine metal wires are arranged so as to be shifted in the 2 nd direction, which is a direction in which the plurality of 2 nd fine metal wires extend, disorder is given to the arrangement of the plurality of grid patterns of the detection electrodes, and reduction in moire can be expected. However, since the 2 nd fine metal wires are arranged at equal intervals in the 1 st direction, which is the direction in which the 1 st fine metal wires extend, the mesh patterns are arranged orderly and regularly in the 2 nd direction, and the mesh patterns of the detection electrode and the pixel pattern of the liquid crystal display or the like still easily interfere with each other. Therefore, when the touch panel of patent document 1 is used in an image display device, the moire may be conspicuous and visually recognized, and there is room for improvement.

SUMMERY OF THE UTILITY MODEL

The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide an electrode member for a touch panel, which can suppress the occurrence of moire patterns when used in an image display device.

Another object of the present invention is to provide a touch panel using the electrode member for a touch panel.

Another object of the present invention is to provide an image display device using such a touch panel.

The utility model relates to an electrode part for touch panel has a plurality of unit grid patterns that cross and fill up through a plurality of 1 st metallic thin lines that respectively extend along the 1 st direction and a plurality of 2 nd metallic thin lines that respectively extend along the 2 nd direction that intersects with the 1 st direction under overlooking, this electrode part for touch panel's characterized in that, the straight line that links the respective central point of 2 adjacent unit grid patterns along the 1 st direction extends along the direction that intersects for the 1 st direction, the straight line that links the respective central point of 2 adjacent unit grid patterns along the 2 nd direction extends along the direction that intersects for the 2 nd direction.

Preferably, straight lines connecting the center points of the 2 unit cell patterns adjacent to each other in the 1 st direction intersect with each other at an angle of 0.1 degrees or more and 2.9 degrees or less with respect to the 1 st direction, and straight lines connecting the center points of the 2 unit cell patterns adjacent to each other in the 2 nd direction intersect with each other at an angle of 0.1 degrees or more and 2.9 degrees or less with respect to the 2 nd direction.

Also, the unit cell pattern preferably has a diamond shape.

In this case, the length of 1 side of the cell grid pattern is preferably 150 μm or more and 350 μm or less.

The 1 st and 2 nd fine metal wires preferably have a line width of 1 μm or more and 10 μm or less.

The 1 st and 2 nd thin metal wires are preferably made of copper.

In this case, the 1 st metal fine wire and the 2 nd metal wire may be disposed on both surfaces of the transparent insulating member.

In this case, the transparent insulating member can be formed of a resin substrate.

In addition, the electrode member for a touch panel may further include a resin substrate, and in this case, the 1 st fine metal wire, the 2 nd fine metal wire, and the transparent insulating member may be disposed on one surface of the resin substrate.

In addition, the electrode member for a touch panel may further include a glass substrate, and in this case, the 1 st fine metal wire, the 2 nd fine metal wire, and the transparent insulating member may be disposed on one surface of the glass substrate.

The present invention is a touch panel including the above-described electrode member for a touch panel.

The image display device according to the present invention includes the touch panel.

Effect of the utility model

According to the present invention, the straight line connecting the respective center points of the 2 unit mesh patterns adjacent to each other in the 1 st direction extends in the direction intersecting with the 1 st direction, and the straight line connecting the respective center points of the 2 unit mesh patterns adjacent to each other in the 2 nd direction extends in the direction intersecting with the 2 nd direction, so that the generation of moire patterns when used in the image display device can be suppressed.

Drawings

Fig. 1 is a partial cross-sectional view of a touch panel according to embodiment 1 of the present invention.

Fig. 2 is a plan view of the electrode member for a touch panel according to embodiment 1.

Fig. 3 is a partially enlarged plan view of the 1 st electrode in embodiment 1.

Fig. 4 is a partially enlarged plan view of the 2 nd electrode in embodiment 1.

Fig. 5 is a partially enlarged plan view of the electrode member for a touch panel according to embodiment 1.

Fig. 6 is a partially enlarged top view of 23 rd unit cell patterns adjacent in the 1 st direction.

Fig. 7 is a partially enlarged top view of 23 rd unit cell patterns adjacent in the 2 nd direction.

Fig. 8 is a partial sectional view of the image display device according to embodiment 1.

Fig. 9 is a partial sectional view of the touch panel in embodiment 2.

Fig. 10 is a partial cross-sectional view of the touch panel electrode member according to embodiment 3.

Description of the symbols

1-touch panel, 1A, 41A, 51A-surface, 1B, 41B-back surface, 2-cover panel, 2A, 2B, 43A, 43B-surface, 3, 42-electrode part for touch panel, 4A-adhesive, 5-transparent insulating substrate, 6A-1 st electrode layer, 6B-2 nd electrode layer, 7A, 7B, 43-transparent insulating part, 8-display module, 9-image display device, 11-1 st electrode, 12-1 st pad, 13-1 st peripheral wiring, 14-1 st external connection terminal, 21-2 nd electrode, 22-2 nd pad, 23-2 nd peripheral wiring, 24-2 nd external connection terminal, B1, B2-cross angle, BP1, BP 25-1 st bend 3, BP2, BP 4-2 nd bend, C1, C2, C3, C4-center point, CP1, CP2, CP 3-intersection point, D1-1 st direction, D2-2 nd direction, D3, D4-direction, K1-length, L1, L2, L3, L4-straight line, MP 1-1 st unit mesh pattern, MP 2-2 nd unit mesh pattern, MP 3-3 rd unit mesh pattern, MW1, MW 3-1 st metallic thin line, MW2, MW 4-2 nd metallic thin line, R-intersection region, S1-transmission region, S2-peripheral region, SP1, SP 3-1 st side part, SP2, SP 4-2 nd side part, W-line width.

Detailed Description

Hereinafter, the electrode member for a touch panel, the touch panel, and the image display device according to the present invention will be described in detail with reference to preferred embodiments shown in the drawings.

In the following, the symbols "to" indicating the numerical range are assumed to include numerical values described on both sides. For example, "s is a number from t1 to t 2" means that the range of s includes the number t1 and the number t2, and that t 1. ltoreq. s.ltoreq.t 2 when expressed as mathematical symbols.

Angles including "orthogonal" and "parallel" are assumed to include an error range that is generally allowable in the technical field unless otherwise specified.

"transparent" means that the light transmittance is at least 40% or more, preferably 75% or more, more preferably 80% or more, and even more preferably 90% or more in the visible light wavelength region of wavelengths 400nm to 800 nm. Light transmittance was measured according to JIS K7375: 2008, the total light transmittance and total reflectance of the plastic.

Embodiment mode 1

Fig. 1 shows a structure of a touch panel 1 according to embodiment 1 of the present invention.

The touch panel 1 has a front surface 1A and a back surface 1B, and is used in a state where a display module, not shown, having a liquid crystal display or the like is disposed on the back surface 1B side. The surface 1A of the touch panel 1 is a touch detection surface, and serves as a visual side through which an operator of the touch panel 1 observes an image displayed on the display module via the touch panel 1.

The touch panel 1 has a transparent insulating cover panel 2 disposed on the surface 1A side, and a touch panel electrode member 3 is bonded to the surface of the cover panel 2 opposite to the surface 1A with a transparent adhesive 4.

The touch panel electrode member 3 includes a transparent insulating substrate 5, a 2 nd electrode layer 6B formed on the transparent insulating substrate 5 and patterned, a transparent insulating member 7B formed on the 2 nd electrode layer 6B, and a 1 st electrode layer 6A arranged to overlap the 2 nd electrode layer 6B with the transparent insulating member 7B interposed therebetween and patterned. As the transparent insulating substrate 5, a resin substrate, a glass substrate, or the like can be used. The transparent insulating member 7B functions as an insulating layer for electrically insulating the 1 st electrode layer 6A and the 2 nd electrode layer 6B from each other. As shown in fig. 1, the transparent insulating member 7A may be disposed so as to cover the 1 st electrode layer 6A in order to planarize or protect the patterned 1 st electrode layer 6A.

Fig. 2 is a plan view of the touch panel electrode member 3. The touch panel electrode member 3 is divided into a transmissive region S1 for detecting a touch operation by a finger, a stylus pen, or the like, and a peripheral region S2 which is a region outside the transmissive region S1 for arranging peripheral wiring or the like connected to a display module, not shown, to the touch panel electrode member 3. In fig. 2, the transparent insulating member 7A is omitted to clearly show the structure of the touch panel electrode member 3.

Electrodes for detecting touch operations, peripheral wirings connected to the electrodes, and the like are patterned in the 1 st electrode layer 6A and the 2 nd electrode layer 6B. Of the 1 st electrode layer 6A and the 2 nd electrode layer 6B, the 1 st electrode layer 6A located on the cover panel 2 side, i.e., on the viewing side, has a plurality of 1 st electrodes 11 extending in a predetermined direction and arranged at intervals in a direction orthogonal thereto. These 1 st electrodes 11 each have a 1 st pad 12 at an end portion.

The 1 st electrode layer 6A includes a plurality of 1 st peripheral wires 13 extending from the plurality of 1 st pads 12 of the plurality of 1 st electrodes 11, and a plurality of 1 st external connection terminals 14 connected to the plurality of 1 st peripheral wires 13, respectively.

The 2 nd electrode layer 6B on the display module side, not shown, has a plurality of 2 nd electrodes 21 extending in a direction orthogonal to the direction in which the plurality of 1 st electrodes 11 extend and arranged at intervals in the direction orthogonal thereto, that is, in the direction in which the plurality of 1 st electrodes 11 extend. These plurality of 2 nd electrodes 21 have 2 nd pads 22 at the end portions, respectively.

The 2 nd electrode layer 6B includes a plurality of 2 nd peripheral wires 23 drawn out from the plurality of 2 nd pads 22 of the plurality of 2 nd electrodes 21, and a plurality of 2 nd external connection terminals 24 connected to the plurality of 2 nd peripheral wires 23, respectively.

Here, the plurality of 1 st electrodes 11 in the 1 st electrode layer 6A and the plurality of 2 nd electrodes 21 in the 2 nd electrode layer 6B are disposed in the transmissive region S1 defined in the touch panel electrode member 3.

The plurality of 1 st pads 12 of the 1 st electrode layer 6A, the plurality of 1 st peripheral wires 13, the plurality of 1 st external connection terminals 14, the plurality of 2 nd pads 22 of the 2 nd electrode layer 6B, the plurality of 2 nd peripheral wires 23, and the plurality of 2 nd external connection terminals 24 are disposed in the peripheral region S2 defined in the touch panel electrode member 3.

Fig. 3 is a partially enlarged plan view of the 1 st electrode 11 in the intersection region R where the 1 st electrode 11 and the 2 nd electrode 21 overlap each other.

The 1 st electrode 11 has a plurality of 1 st metallic thin wires MW1 extending in the 1 st direction D1 and a plurality of 2 nd metallic thin wires MW2 extending in the 2 nd direction D2 intersecting the 1 st direction D1 in a plan view. The 1 st thin metal wires MW1 extend in the 1 st direction D1, and are connected to the adjacent 1 st thin metal wires MW1 while being displaced in a fixed direction different from the 1 st direction D1 through the 1 st bent portion BP1 in this order.

On the other hand, the plurality of 2 nd thin metal wires MW2 extend in the 2 nd direction D2 and are connected to the adjacent 2 nd thin metal wires MW2 while being displaced in a constant direction different from the 2 nd direction D2 through the 2 nd bent portion BP2 in order.

The 1 st bent portion BP1 and the 2 nd bent portion BP2 are overlapped and integrated at the intersection CP1, whereby the plurality of 1 st thin metal wires MW1 and the plurality of 2 nd thin metal wires MW2 are crossed at the intersection CP1 to be electrically conducted to each other, and a plurality of 1 st unit mesh patterns MP1 having a substantially rhombic shape surrounded by 4 intersection CP1 are formed.

The 1 st cell mesh pattern MP1 has 21 st side pieces SP1 facing in the direction orthogonal to the 1 st direction D1 and 2 nd side pieces SP2 facing in the direction orthogonal to the 2 nd direction D2, and these 21 st side pieces SP1 and 2 nd side pieces SP2 are connected to each other at 4 intersections CP1, respectively.

Each of the 1 st side members SP1 has 21 st thin metal wires MW1 adjacent to each other and connected to each other via the 1 st bent portion BP1, and each of the 2 nd side members SP2 has 2 nd thin metal wires MW2 adjacent to each other and connected to each other via the 2 nd bent portion BP 2.

Fig. 4 is a partially enlarged plan view of the 2 nd electrode 21 in the intersection region R.

The 2 nd electrode 21 has a plurality of 1 st fine metal wires MW3 extending in the 1 st direction D1 and a plurality of 2 nd fine metal wires MW4 extending in the 2 nd direction D2 in a plan view. In fig. 4, the 1 st metallic thin wire MW3 and the 2 nd metallic thin wire MW4 are drawn by dotted lines for the sake of clarity, but are actually made of continuous metallic thin wires in the same manner as the 1 st metallic thin wire MW1 and the 2 nd metallic thin wire MW2 in the 1 st electrode 11. The 1 st thin metal wires MW3 extend in the 1 st direction D1, and are connected to the adjacent 1 st thin metal wires MW3 while being displaced in a fixed direction different from the 1 st direction D1 through the 1 st bent portion BP3 in this order.

On the other hand, the plurality of 2 nd thin metal wires MW4 extend in the 2 nd direction D2 and are connected to the adjacent 2 nd thin metal wires MW4 while being displaced in a constant direction different from the 2 nd direction D2 through the 2 nd bent portion BP2 in order.

The 1 st bent portion BP3 and the 2 nd bent portion BP4 are overlapped and integrated at the intersection CP2, whereby the plurality of 1 st thin metal wires MW3 and the plurality of 2 nd thin metal wires MW4 are crossed at the intersection CP2 to be electrically conducted to each other, and a plurality of 2 nd unit mesh patterns MP2 having a substantially rhombic shape surrounded by 4 intersection CP2 are formed.

The 2 nd cell mesh pattern MP2 has 21 st side parts SP3 facing in the direction orthogonal to the 1 st direction D1 and 2 nd side parts SP4 facing in the direction orthogonal to the 2 nd direction D2, and these 21 st side parts SP3 and 2 nd side parts SP4 are connected to each other at 4 intersections CP2, respectively.

Each of the 1 st side members SP3 has 21 st thin metal wires MW3 adjacent to each other and connected to each other via the 1 st bent portion BP3, and each of the 2 nd side members SP4 has 2 nd thin metal wires MW4 adjacent to each other and connected to each other via the 2 nd bent portion BP 2.

Fig. 5 is a partially enlarged plan view of the touch panel electrode member 3 in the intersection region R.

In the touch panel electrode part 3, the 1 st electrode 11 and the 2 nd electrode 21 are combined with each other to form a plurality of 3 rd cell mesh patterns MP 3. In fig. 5, the 2 nd electrode 21 is drawn by dotted lines for the sake of clarity, but is actually formed of a continuous thin metal wire as in the 1 st electrode 11.

Here, as an example of embodiment 1, in fig. 5, the 1 st cell mesh pattern MP1 and the 2 nd cell mesh pattern MP2 have the same shape as each other, and the 1 st cell mesh pattern MP1 and the 2 nd cell mesh pattern MP2 are arranged to be shifted from each other so that the intersection CP1 of the 1 st cell mesh pattern MP1 overlaps the center of gravity of the 2 nd cell mesh pattern MP2 and the intersection CP2 of the 2 nd cell mesh pattern MP2 overlaps the center of gravity of the 1 st cell mesh pattern MP 1.

Thereby, the 1 st bend BP1 in the 1 st electrode 11 and the 2 nd bend BP4 in the 2 nd electrode 21 overlap each other, and the 2 nd bend BP2 in the 1 st electrode 11 and the 1 st bend BP3 in the 2 nd electrode 21 overlap each other. The 1 st thin metal wire MW1 of the 1 st electrode 11 and the 2 nd thin metal wire MW4 of the 2 nd electrode 21 overlap at the intersection CP3, and the 2 nd thin metal wire MW2 of the 1 st electrode 11 and the 1 st thin metal wire MW3 of the 2 nd electrode 21 overlap with each other at the intersection CP 4.

In this way, since the 1 st cell mesh pattern MP1 and the 2 nd cell mesh pattern MP2 overlap each other at the intersections CP3 and CP4, the 3 rd cell mesh pattern MP3 is composed of the 1 st and 2 nd fine metal wires MW1 and MW2 of the 1 st electrode 11 and the 1 st and 2 nd fine metal wires MW3 and MW4 of the 2 nd electrode 21, and has a diamond shape surrounded by the intersection CP1 of the 1 st electrode 11, the intersection CP2 of the 2 nd electrode 21, and the 2 intersections CP3 and CP4 formed by the overlapping of the 1 st and 2 nd electrodes 11 and 21. The intersections CP1 to CP4 are disposed at the positions of 4 vertices of the diamond. In the example of fig. 5, the 3 rd cell mesh pattern MP3 has an area of about 1/4 of the 1 st cell mesh pattern MP1 and the 2 nd cell mesh pattern MP 2.

A partially enlarged top view of 23 rd unit cell patterns MP3 adjacent in the 1 st direction D1 is shown in fig. 6.

A straight line L1 connecting the center points C1 and C2 of the respective 23 rd unit cell patterns MP3 adjacent in the 1 st direction D1 extends in a direction D3 crossing the 1 st direction D1 at a crossing angle B1. Here, the center points C1 and C2 of the 3 rd unit mesh pattern MP3 can be defined as, for example, intersections of line segments connecting the midpoints of the 1 st wires MW1 and MW3 facing each other and line segments connecting the midpoints of the 2 nd wires MW2 and MW4 facing each other, among the 1 st wires MW1, MW3 and 2 nd wires MW2 and MW4 corresponding to the 4 th side of the 3 rd unit mesh pattern MP3, respectively.

As described above, since the straight line L1 connecting the center points C1 and C2 of the 23 rd cell mesh patterns MP3 adjacent in the 1 st direction D1 extends in the direction D3 intersecting the 1 st direction D1, for example, as shown in fig. 6, the 23 rd cell mesh patterns MP3 adjacent in the 1 st direction D1 are arranged to be shifted from each other by a predetermined distance in a direction different from the 1 st direction D1.

The 1 st and 2 nd thin metal wires MW1 and MW2 of the 1 st electrode 11 and the 1 st and 2 nd thin metal wires MW3 and MW4 of the 2 nd electrode 21 have a line width W. The line width W is preferably 1 μm or more and 10 μm or less from the viewpoint of making the 1 st metallic thin lines MW1 and MW3 and the 2 nd metallic thin lines MW2 and MW4 less visible to an observer of the touch panel electrode member 3.

Further, from the viewpoint of making the 3 rd unit mesh pattern MP3 less visible to the observer of the touch panel electrode member 3, the lengths K1 of the 1 st metal thin wires MW1 and MW3 and the 2 nd metal thin wires MW2 and MW4 corresponding to the 4 th side of the 3 rd unit mesh pattern MP3 are preferably 150 μm to 350 μm.

The line widths W and the lengths K1 of the 1 st metal thin lines MW1, MW3 and the 2 nd metal thin lines MW2, MW4 were measured by using an optical microscope (digital microscope VHX-7000, manufactured by KEYENCE CORPORATION).

A partially enlarged top view of 23 rd unit cell patterns MP3 adjacent in the 2 nd direction D2 is shown in fig. 7.

A straight line L3 connecting the center points C3 and C4 of the respective 23 rd unit cell patterns MP3 adjacent in the 2 nd direction D2 extends in a direction D4 crossing the 2 nd direction D2 at a crossing angle B2. Here, like the center points C1 and C2, the center points C3 and C4 of the 3 rd cell mesh pattern MP3 can be defined as intersections of a line segment connecting the middle points of the 1 st thin metal wires MW1 and MW3 facing each other and a line segment connecting the middle points of the 2 nd thin metal wires MW2 and MW4 facing each other, among the 1 st thin metal wires MW1, MW3, MW2 and MW4 corresponding to the 4 sides of the 3 rd cell mesh pattern MP3, respectively.

As described above, since the straight line L3 connecting the center points C3 and C4 of the 23 rd cell mesh patterns MP3 adjacent in the 2 nd direction D2 extends in the direction D4 intersecting the 2 nd direction D2, for example, as shown in fig. 7, the 23 rd cell mesh patterns MP3 adjacent in the 2 nd direction D2 are arranged to be shifted from each other by a predetermined distance in a direction different from the 1 st direction D1.

Therefore, in the touch panel electrode member 3 according to embodiment 1, the plurality of 3 rd cell mesh patterns MP3 are arranged in a disordered manner not along the 1 st direction D1 and the 2 nd direction D2.

Here, for example, as shown in fig. 8, the image display device 9 is configured such that the touch panel 1 including the touch panel electrode member 3 of embodiment 1 is disposed on a display module 8 for displaying an image. In fig. 8, the display module 8 is bonded to the back surface 1B of the touch panel 1 with a transparent adhesive 4A. Although not shown in detail, the display module 8 includes a display screen such as a liquid crystal display, a controller for controlling display of an image on the display screen, and the like. The operator of the image display device 9 visually recognizes the image displayed on the display module 8 through the touch panel 1, and performs a touch operation through the touch panel 1 based on the visually recognized image.

In general, in such an image display device, moire may occur due to interference between a pixel pattern of a display module and a plurality of mesh patterns formed by thin metal wires constituting a sensor of a touch panel. In the conventional technology, for example, moire fringes are reduced by reducing the size of a plurality of grid patterns, but the sensitivity to touch operation tends to be reduced as the parasitic capacitance in the sensor increases as the size of the grid patterns is reduced.

In the touch panel electrode member 3 according to embodiment 1, since the straight line L1 connecting the center points C1 and C2 of the 23 rd unit mesh patterns MP3 adjacent to each other in the 1 st direction D1 extends in the direction D3 intersecting the 1 st direction D1, and the straight line L3 connecting the center points C3 and C4 of the 2 rd unit mesh patterns MP3 adjacent to each other in the 2 nd direction D2 extends in the direction D3 intersecting the 2 nd direction D2, the arrangement of the plurality of 3 rd unit mesh patterns MP3 has disorder. By this disorder, for example, without reducing the size of the 1 st cell mesh pattern MP1 in the 1 st electrode 11 and the 2 nd cell mesh pattern MP2 in the 2 nd electrode 21, the moire generated when the touch panel electrode member 3 is used in the image display device 9 can be reduced.

From the viewpoint of reducing moire, the intersection angle B1 between the 1 st direction D1 and the straight line L1 connecting the center points C1 and C2 of the 2 rd 3-unit cell patterns MP3 adjacent to each other in the 1 st direction D1 is preferably 0.1 degrees or more and 2.9 degrees or less. From the same viewpoint, the intersection angle B2 between the 2 nd direction D2 and the straight line L3 connecting the center points C3 and C4 of the 2 rd 3-unit cell patterns MP3 adjacent to each other in the 2 nd direction D2 is preferably 0.1 degrees or more and 2.9 degrees or less. The intersection angles B1 and B2 were measured with an optical microscope (digital microscope VHX-7000, KEYENCE CORPORATION).

As shown in fig. 3, the 1 st electrode 11 is composed of a continuous 1 st fine metal wire MW1 and a continuous 2 nd fine metal wire MW2, but if both ends of the 1 st electrode 11 are electrically connected to each other in the direction in which the 1 st electrode 11 extends, the 1 st fine metal wire MW1 and the 2 nd fine metal wire MW2 can have a broken portion at a position overlapping with the 1 st fine metal wire MW3 and the 2 nd fine metal wire MW4 of the 2 nd electrode 21. This makes it possible to make the intersections of the 1 st thin metal wire MW1 and the 2 nd thin metal wire MW2 of the 1 st electrode 11 and the 1 st thin metal wire MW3 and the 2 nd thin metal wire MW4 of the 2 nd electrode 21 less visible.

For the same reason, if both ends of the 2 nd electrode 21 are electrically connected to each other in the direction in which the 2 nd electrode 21 extends, the 1 st thin metal wire MW3 and the 2 nd thin metal wire MW4 of the 2 nd electrode 21 can have a broken portion at a position overlapping with the 1 st thin metal wire MW1 and the 2 nd thin metal wire MW2 of the 1 st electrode 11.

Embodiment mode 2

In embodiment 1, the 1 st electrode layer 6A and the 2 nd electrode layer 6B are both disposed on the side of the transparent insulating substrate 5 that is the side of the cover panel 2, but the positions where the 1 st electrode layer 6A and the 2 nd electrode layer 6B are disposed are not limited to this.

Fig. 9 shows a structure of a touch panel 41 according to embodiment 3 of the present invention.

The touch panel 41 has a front surface 41A and a back surface 41B, and is used in a state where the display module 8 is disposed on the back surface 41B side. The surface 41A of the touch panel 41 is a touch detection surface and is viewed by an observer of the touch panel 41.

As shown in fig. 9, the touch panel 41 includes the cover panel 2 disposed on the viewing side and the touch panel electrode member 42 bonded to the cover panel 2 with an adhesive on the side opposite to the viewing side. The touch panel electrode member 42 includes a transparent insulating member 43, a 1 st electrode layer 6A formed on a surface 43A of the transparent insulating member 43 on the viewing side, and a 2 nd electrode layer 6B formed on a surface 43B of the transparent insulating member 43 on the opposite side to the surface 43A. The transparent insulating member 43 functions as a substrate for supporting the 1 st electrode layer 6A and the 2 nd electrode layer 6B, and a resin substrate, a glass substrate, or the like can be used as the transparent insulating member 43. As shown in fig. 9, the transparent insulating member 7A may be disposed on the 1 st electrode layer 6A for the purpose of planarizing and protecting the 1 st electrode layer 6A. In order to protect the 2 nd electrode layer 6B, the transparent insulating member 7B may be disposed on the 2 nd electrode layer 6B.

As described above, even when the 1 st electrode layer 6A is disposed on the first surface 43A side of the transparent insulating member 43 and the 2 nd electrode layer 6B is disposed on the second surface 43B side of the transparent insulating member 43, as in the touch panel electrode member 3 according to embodiment 1, the moire generated when the touch panel electrode member 3 is used in the image display device 9 can be reduced in the same manner as in the case where both the 1 st electrode layer 6A and the 2 nd electrode layer 6B are disposed on the first surface side of the transparent insulating substrate 5.

Embodiment 3

In the electrode member 3 for a touch panel of embodiment 1, the 1 st electrode layer 6A and the 2 nd electrode layer 6B are supported by the transparent insulating substrate 5, but the electrode member for a touch panel may be configured such that the 1 st electrode layer 6A and the 2 nd electrode layer 6B are supported by the cover panel 2.

Fig. 10 shows a structure of an electrode member 51 for a touch panel according to embodiment 4 of the present invention.

The touch panel electrode member 51 has a front surface 51A and a rear surface 51B, and is used in a state where the display module 8 is disposed on the rear surface 51B side. The surface 51A of the touch panel electrode member 51 serves as a touch detection surface and serves as a visual side for an observer of the touch panel electrode member 51.

As shown in fig. 10, the touch panel electrode member 51 includes the cover panel 2, the 1 st electrode layer 6A formed on the surface 2B of the cover panel 2 opposite to the viewing side, the transparent insulating member 7A formed on the 1 st electrode layer 6A, the 2 nd electrode layer 6B formed on the transparent insulating member 7A, and the transparent insulating member 7B formed on the 2 nd electrode layer 6B. The surface 2A of the cover panel 2 on the viewing side is open to the outside. As described above, the cover panel 2 in embodiment 4 functions as a substrate for supporting the 1 st electrode layer 6A, and a glass substrate or the like can be used as the cover panel 2, for example. The touch panel electrode member 51 has the cover panel 2 and can be used as a touch panel.

As described above, even when the 1 st electrode layer 6A is formed on the cover panel 2 without the transparent insulating substrate 5, like the touch panel electrode component 3 of embodiment 1, the moire generated when the touch panel electrode component 3 is used in the image display device 9 can be reduced in the same manner as in the case where both the 1 st electrode layer 6A and the 2 nd electrode layer 6B are arranged on the one surface side of the transparent insulating substrate 5.

Hereinafter, each member constituting the electrode member 3 for a touch panel of embodiment 1 will be described. The members constituting the electrode member 42 for a touch panel of embodiment 2 and the electrode member 51 for a touch panel of embodiment 3 are also standardized with respect to the members constituting the electrode member 3 for a touch panel of embodiment 1.

< transparent insulating Member >

The material constituting the transparent insulating members 7A and 7B is not particularly limited as long as it is transparent and has electrical insulation properties and can insulate the 1 st electrode layer 6A and the 2 nd electrode layer 6B, but for example, an insulating layer and a transparent insulating substrate described later can be used. As a material constituting the insulating layer, for example, an inorganic film such as silicon oxide, silicon nitride, silicon oxynitride, or aluminum oxide, an acrylic resin, a urethane resin, or a polyimide resin can be used. The insulating layer is preferably an organic film, and particularly preferably an acrylic resin. The thickness of the transparent insulating member is, for example, preferably 0.05 to 700.00. mu.m, and more preferably 0.10 to 100.00. mu.m. Particularly, when the transparent insulating member is an insulating layer of an organic film, the thickness is preferably 1.00 to 10.00. mu.m, more preferably 1.00 to 3.00. mu.m.

< transparent insulating substrate >

The transparent insulating substrate 5 is not particularly limited as long as it is transparent and has electrical insulation properties and can support the 1 st electrode layer 6A and the 2 nd electrode layer 6B, but for example, a resin substrate, a glass substrate, or the like can be used. More specifically, as a material constituting the transparent insulating substrate 5, glass, tempered glass, alkali-free glass, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), cycloolefin polymer (COP), Cyclic Olefin Copolymer (COC), Polycarbonate (PC), acrylic resin, Polyethylene (PE), polypropylene (PP), Polystyrene (PS), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), and triacetyl cellulose (TAC) can be used. The thickness of the transparent insulating substrate 5 is, for example, preferably 20 μm to 1100 μm, and more preferably 20 μm to 500 μm. Particularly, in the case of an organic resin substrate such as PET, the thickness is preferably 20 to 200. mu.m, more preferably 30 to 100. mu.m.

The light transmittance of the transparent insulating substrate 5 is preferably 40% to 100%. The light transmittance is measured, for example, in accordance with JIS K7375: 2008, the total light transmittance and total reflectance of the plastic.

As one of preferred embodiments of the transparent insulating substrate 5, a treated substrate subjected to at least one treatment selected from the group consisting of an atmospheric pressure plasma treatment, a corona discharge treatment, and an ultraviolet irradiation treatment is cited. By performing the above treatment, hydrophilic groups such as OH groups are introduced into the surface of the treated transparent insulating substrate 5, and the adhesion between the transparent insulating substrate 5 and the 1 st electrode layer 6A is improved. Among the above treatments, the atmospheric pressure plasma treatment is preferable in terms of further improving the adhesion to the 1 st electrode layer 6A and the 2 nd electrode layer 6B.

< undercoat layer >

In order to improve the adhesion between the transparent insulating substrate 5 and the 2 nd electrode layer 6B, an undercoat layer may be disposed between the transparent insulating substrate 5 and the 2 nd electrode layer 6B. The undercoat layer contains a polymer, and further improves adhesion between the transparent insulating substrate 5 and the 2 nd electrode layer 6B.

The method of forming the undercoat layer is not particularly limited, and examples thereof include a method of applying a composition for forming an undercoat layer containing a polymer onto a substrate and, if necessary, performing a heat treatment. As the composition for forming an undercoat layer containing a polymer, gelatin, acrylic resin, polyurethane resin, acrylic styrene latex containing inorganic or polymer fine particles, or the like can be used.

In addition, the touch panel electrode member 3 may be provided with, for example, a refractive index adjustment layer as another layer in addition to the undercoat layer, between the transparent insulating substrate 5 and the 2 nd electrode layer 6B, as necessary. As the refractive index adjustment layer, for example, an organic layer to which metal oxide particles such as zirconia for adjusting the refractive index are added can be used.

< metallic thin wire >

The thicknesses of the 1 st fine metal wire MW1 and the 2 nd fine metal wire MW2 of the 1 st electrode 11 and the 1 st fine metal wire MW3 and the 2 nd fine metal wire MW4 of the 2 nd electrode 21 are not particularly limited, but are preferably 0.01 μm to 10.00. mu.m, more preferably 2.00 μm or less, particularly preferably 0.02 μm to 1.00. mu.m, and most preferably 0.02 μm to 0.60. mu.m. This makes it possible to easily improve the durability of the 1 st electrode 11 and the 2 nd electrode 21.

The 1 st fine metal wires MW1 and MW3 and the 2 nd fine metal wires MW2 and MW4 can be made of, for example, copper, aluminum or silver, as a metal or an alloy. The 1 st and 2 nd fine metallic wires MW1, MW3, MW2, MW4 preferably contain copper, but may contain metals other than copper, such as gold, silver, and the like. The 1 st and 2 nd thin metal wires MW1, MW3, MW2, MW4 may contain a metal silver suitable for grid pattern formation, and a polymer binder such as gelatin or acrylic styrene latex. Other preferred metals are metals of aluminum, silver, molybdenum, titanium and alloys thereof. Further, a laminated structure of these elements is also possible, and for example, a thin metal wire having a laminated structure of molybdenum/copper/molybdenum, molybdenum/aluminum/molybdenum, or the like can be used.

The 1 st and 2 nd thin metal wires MW1, MW3, MW2, and MW4 may include, for example, metal oxide particles, metal pastes such as silver paste and copper paste, and metal nanowire particles such as silver nanowire and copper nanowire.

In order to improve visibility of the 1 st metal thin wires MW1 and MW3 and the 2 nd metal thin wires MW2 and MW4, a blackened layer may be formed on at least the visibility side of the 1 st metal thin wires MW1 and MW3 and the visibility side of the 2 nd metal thin wires MW2 and MW 4. As the blackening layer, a metal oxide, a metal nitride, a metal oxynitride, a metal sulfide, or the like can be used, and typically, copper oxynitride, copper nitride, copper oxide, molybdenum oxide, or the like can be used.

Next, a method of forming the 1 st fine metal wires MW1 and MW3 and the 2 nd fine metal wires MW2 and MW4 will be described. As a method for forming these 1 st and 2 nd thin metal wires MW1, MW3, MW2, MW4, for example, a sputtering method, an electroplating method, a silver salt method, a printing method, and the like can be suitably used.

A method of forming the 1 st fine metal wires MW1 and MW3 and the 2 nd fine metal wires MW2 and MW4 by the sputtering method will be described. First, a copper foil layer is formed by sputtering, and copper wiring is formed from the copper foil layer by photolithography, whereby the 1 st fine metal wires MW1 and MW3 and the 2 nd fine metal wires MW2 and MW4 can be formed. Instead of sputtering, the copper foil layer may be formed by so-called vapor deposition. The copper foil layer can be an electrolytic copper foil in addition to a sputtered copper foil or a deposited copper foil. More specifically, the step of forming copper wiring described in japanese patent application laid-open No. 2014-029614 can be used.

The following describes a method of forming the 1 st fine metal wires MW1 and MW3 and the 2 nd fine metal wires MW2 and MW4 by the electroplating method. For example, the 1 st fine metal wires MW1 and MW3 and the 2 nd fine metal wires MW2 and MW4 can be formed using a metal plating film formed on an electroless plating base layer by electroless plating. In this case, the metal plating film is formed by immersing the base material in an electroless plating bath after forming the catalytic ink containing the metal fine particles at least on the base material in a pattern, whereby the 1 st fine metal wires MW1 and MW3 and the 2 nd fine metal wires MW2 and MW4 can be formed. More specifically, the method for producing a metal-coated substrate described in japanese patent application laid-open No. 2014-159620 can be used.

Then, a resin composition having a functional group capable of interacting with the metal catalyst precursor is formed at least on the base material in a pattern, a catalyst or a catalyst precursor is applied thereto, and the base material is immersed in an electroless plating bath to form a metal plating film, whereby the 1 st fine metal wires MW1 and MW3 and the 2 nd fine metal wires MW2 and MW4 can be formed. More specifically, the method for producing a metal-coated substrate described in japanese patent application laid-open No. 2012-144761 can be applied.

The formation method of the 1 st fine metal wires MW1 and MW3 and the 2 nd fine metal wires MW2 and MW4 by the silver salt method will be described. First, a silver salt emulsion layer containing silver halide is subjected to exposure treatment using an exposure pattern of the 1 st fine metal wires MW1 and MW3 and the 2 nd fine metal wires MW2 and MW4, and then development treatment is performed, whereby the 1 st fine metal wires MW1 and MW3 and the 2 nd fine metal wires MW2 and MW4 can be formed. More specifically, the methods for producing a metal thin wire described in japanese patent laid-open nos. 2012 and 006377, 2014 and 112512, 2014 and 209332, 2015 and 022397, 2016 and 192200, and 2016/157585 can be used.

A method of forming the 1 st and 2 nd thin metal wires MW1, MW3, MW2, MW4 by a printing method will be described. First, a conductive paste containing a conductive powder is applied to a substrate so as to form a pattern similar to that of the 1 st fine metal wires MW1 and MW3 and the 2 nd fine metal wires MW2 and MW4, and then, a heat treatment is performed, thereby forming the 1 st fine metal wires MW1 and MW3 and the 2 nd fine metal wires MW2 and MW 4. The pattern formation using the conductive paste is performed by, for example, an ink jet method or a screen printing method. More specifically, the conductive paste described in japanese patent application laid-open publication No. 2011-028985 can be used.

< covering panel >

The cover panel 2 may be made of tempered glass, polycarbonate, polyethylene terephthalate, polymethyl methacrylate (PMMA), or the like, and the thickness of the cover panel 2 is preferably 0.1mm to 1.5 mm.

< Binder >

As the Adhesive 4 for bonding the cover panel 2 and the electrode member 3 for a touch panel to each other, an optically transparent Adhesive sheet (OCA) or an optically transparent Adhesive Resin (OCR) can be used, and the film thickness is preferably 10 μm or more and 200 μm or less. For example, 8146 series manufactured by 3M Company can be used as the optically transparent pressure-sensitive adhesive sheet.

Examples

Hereinafter, the present invention will be described in further detail with reference to examples. The materials, the amounts used, the ratios, the contents of the treatments, and the treatment steps shown in the following examples can be appropriately modified without departing from the spirit of the present invention, and the scope of the present invention should not be construed as being limited to the following examples.

< example 1 >

First, a PET film having a thickness of 100.0 μm was prepared as a transparent insulating substrate.

Next, an undercoat layer was formed on the PET film with an acrylic resin. The thickness of the primer layer was 10.0. mu.m.

Next, a 2 nd electrode layer having been patterned was formed on the undercoat layer. First, a metal layer was obtained by sequentially performing sputtering deposition on an undercoat layer so that molybdenum was 20nm thick, copper was 300nm thick, and molybdenum was 20nm thick.

Next, a resist composition is applied to the metal layer, prebaked, pattern-exposed, and alkali-developed. Then, post baking is performed to form a resist film having a pattern corresponding to the plurality of 2 nd electrodes 21, the plurality of 2 nd pads 22, the plurality of 2 nd peripheral wirings 23, and the plurality of 2 nd external connection terminals 24 shown in fig. 2. Then, the metal layer was etched using an etching solution (pH (hydrogen ion concentration index) of 5.23) prepared with 10 mass% of ammonium dihydrogen phosphate, 10 mass% of ammonium acetate, 6 mass% of hydrogen peroxide, and the balance of water, and then the resist film was peeled off with a peeling solution. Thereby, the 2 nd electrode layer is formed in a pattern.

The 2 nd electrode layer is formed to have a plurality of 2 nd cell mesh patterns MP2 shown in fig. 5. In the 2 nd electrode layer, the 1 st fine metal wire MW3 and the 2 nd fine metal wire MW4 of the 2 nd electrode 21 have a line width of 5.0 μm and a thickness of 0.34 μm.

Next, a transparent insulating member made of an acrylic resin and having a thickness of 3.0 μm was formed so as to cover the 2 nd electrode layer. Next, a metal layer made of molybdenum/copper/molybdenum was formed on the transparent insulating member by a sputtering method. Next, by performing the steps of resist coating, pattern exposure, development, etching, and resist stripping, a 1 st electrode layer having the 1 st electrode 11, the 1 st pad 12, the 1 st peripheral wiring 13, and the 1 st external connection terminal 14 shown in fig. 2 is formed in a patterned manner.

The 1 st electrode layer is formed to have a plurality of 1 st unit cell patterns MP1 shown in fig. 3. In the 1 st electrode layer, the 1 st fine metal wires MW1 and 2 nd fine metal wires MW2 of the 1 st electrode 11 have a line width of 5.0 μm and a thickness of 0.34. mu.m.

Finally, a transparent insulating member made of acrylic resin and having a thickness of 3.0 μm was formed so as to cover the 1 st electrode layer for the purpose of protecting the 1 st electrode layer. Thus, the electrode member for a touch panel of example 1 was obtained.

In order to cover the 1 st peripheral wiring 13, the 1 st external connection terminal 14, the 2 nd peripheral wiring 23, and the 2 nd external connection terminal 24, an opaque decorative layer having a thickness of 1.5 μm may be formed on a portion corresponding to a peripheral region on the transparent insulating member covering the 1 st electrode layer.

The electrode member for a touch panel thus obtained had a plurality of 3 rd cell mesh patterns MP3 shown in fig. 7, and an intersection angle B1 of a straight line L1 connecting center points C1 and C2 of 23 rd cell mesh patterns MP3 adjacent to each other in the 1 st direction D1 and the 1 st direction D1, and an intersection angle B2 of a straight line L3 connecting center points C3 and C4 of 23 rd cell mesh patterns MP3 adjacent to each other in the 2 nd direction D2 and the 2 nd direction D2 were 1.4 degrees.

< example 2 >

The touch panel electrode member of example 2 was produced in the same manner as in example 1 except that the intersection points CP1, CP2, and CP3 were increased in size as compared with example 1, and thus the angle of intersection B1 between the 1 st direction D1 and a straight line L1 connecting the center points C1 and C2 of the 23 rd unit cell patterns MP3 adjacent to each other in the 1 st direction D1 and the angle of intersection B2 between the 2 nd direction D2 and a straight line L3 connecting the center points C3 and C4 of the 23 rd unit cell patterns MP3 adjacent to each other in the 2 nd direction D2 were set to 2.9 degrees.

< example 3 >

The touch panel electrode member of example 3 was fabricated in the same manner as example 1 except that the intersection points CP1, CP2, and CP3 were increased in size as compared to example 1, and thus the intersection angle B1 between the 1 st direction D1 and the straight line L1 connecting the center points C1 and C2 of the 23 rd unit cell patterns MP3 adjacent to each other in the 1 st direction D1 and the intersection angle B2 between the 2 nd direction D2 and the straight line L3 connecting the center points C3 and C4 of the 23 rd unit cell patterns MP3 adjacent to each other in the 2 nd direction D2 were set to 2.7 degrees.

< example 4 >

The touch panel electrode member of example 4 was produced in the same manner as in example 1 except that the intersection points CP1, CP2, and CP3 were increased in size as compared with example 1, and thus the angle of intersection B1 between the 1 st direction D1 and a straight line L1 connecting the center points C1 and C2 of the 23 rd unit cell patterns MP3 adjacent to each other in the 1 st direction D1 and the angle of intersection B2 between the 2 nd direction D2 and a straight line L3 connecting the center points C3 and C4 of the 23 rd unit cell patterns MP3 adjacent to each other in the 2 nd direction D2 were set to 2.2 degrees.

< example 5 >

The touch panel electrode member of example 5 was produced in the same manner as in example 1 except that the sizes of the intersections CP1, CP2, and CP3 were reduced from example 1, and thereby the intersection angle B1 between the 1 st direction D1 and the straight line L1 connecting the center points C1 and C2 of the 23 rd cell mesh patterns MP3 adjacent to each other in the 1 st direction D1 and the intersection angle B2 between the 2 nd direction D2 and the straight line L3 connecting the center points C3 and C4 of the 23 rd cell mesh patterns MP3 adjacent to each other in the 2 nd direction D2 were set to 0.7 degrees.

< example 6 >

The touch panel electrode member of example 6 was fabricated in the same manner as example 1 except that the intersection points CP1, CP2, and CP3 were reduced in size as compared with example 1, and thereby the intersection angle B1 between the 1 st direction D1 and the straight line L1 connecting the center points C1 and C2 of the 23 rd cell mesh patterns MP3 adjacent to each other in the 1 st direction D1 and the intersection angle B2 between the 2 nd direction D2 and the straight line L3 connecting the center points C3 and C4 of the 23 rd cell mesh patterns MP3 adjacent to each other in the 2 nd direction D2 were set to 0.3 degrees.

< example 7 >

The touch panel electrode member of example 7 was fabricated in the same manner as in example 1 except that the intersection points CP1, CP2, and CP3 were reduced in size as compared with example 1, and thereby the intersection angle B1 between the 1 st direction D1 and the straight line L1 connecting the center points C1 and C2 of the 23 rd cell mesh patterns MP3 adjacent to each other in the 1 st direction D1 and the intersection angle B2 between the 2 nd direction D2 and the straight line L3 connecting the center points C3 and C4 of the 23 rd cell mesh patterns MP3 adjacent to each other in the 2 nd direction D2 were set to 0.1 degrees.

< example 8 >

The touch panel electrode member of example 8 was fabricated in the same manner as in example 1 except that the intersection points CP1, CP2, and CP3 were increased in size as compared with example 1, and thus the intersection angle B1 between the 1 st direction D1 and the straight line L1 connecting the center points C1 and C2 of the 23 rd cell mesh patterns MP3 adjacent to each other in the 1 st direction D1 and the intersection angle B2 between the 2 nd direction D2 and the straight line L3 connecting the center points C3 and C4 of the 23 rd cell mesh patterns MP3 adjacent to each other in the 2 nd direction D2 were set to 3.0 degrees.

< comparative example 1 >

An electrode part for a touch panel of comparative example 1 was fabricated in the same manner as in example 1, except that a plurality of the 3 rd unit cell patterns MP3 were orderly and regularly arranged in the 1 st direction D1 and the 2 nd direction D2. In comparative example 1, the intersection angle B1 between the straight line L1 connecting the center points C1 and C2 of the 23 rd unit cell patterns MP3 adjacent to each other in the 1 st direction D1 and the 1 st direction D1, and the intersection angle B2 between the straight line L3 connecting the center points C3 and C4 of the 2 rd unit cell patterns MP3 adjacent to each other in the 2 nd direction D2 and the 2 nd direction D2 are both 0.0 degrees.

The electrode members for touch panels of examples 1 to 8 and comparative example 1 thus produced were subjected to the following molar texture evaluation.

[ Moire evaluation ]

The electrode members for touch panels of examples 1 to 8 and comparative example 1 were disposed on a liquid crystal display module including a liquid crystal display and a controller for controlling display of an image on the liquid crystal display. Next, in a state where the entire surface of the liquid crystal display in the liquid crystal display module is lit up in green, the evaluator of moire evaluation observed the electrode member for the touch panel disposed on the liquid crystal display module and evaluated whether moire was visually recognized. The evaluation was 20, and the criteria for the Moire pattern evaluation were as follows.

"A": in 20, no one identified the moire pattern.

"B": among 20, moire was recognized between 1 and 3.

"C": among 20, the moire was recognized from 4 to 7.

"D": among 20, 8 or more and 9 or less recognized moire patterns.

"E": of the 20, 10 or more recognized moire patterns.

Note that the evaluation "E" is a level having practical problems, the evaluation "D" or more is a level having no practical problems, the evaluation "C" is a more favorable level, the evaluation "B" is an excellent level, and the evaluation "a" is a very excellent level.

The results of the evaluation of the moire patterns of examples 1 to 8 and comparative example 1 are shown in table 1.

[ Table 1]

	Cross angle [ degree ]]	Moire evaluation
			Example 1	1.4	A
Example 2	2.9	C
			Example 3	2.7	B
Example 4	2.2	A
			Example 5	0.7	A
Example 6	0.3	B
			Example 7	0.1	C
Example 8	3.0	D
			Comparative example 1	0.0	E

As shown in table 1, the molar variation evaluation of examples 1 to 8 was all "C" or more, and the molar variation could be reduced to a level that had no practical problem. Specifically, the moire patterns of examples 1, 4 and 5 were evaluated as "a" and were particularly excellent, the moire patterns of examples 3 and 6 were evaluated as "B", the moire patterns of examples 2 and 7 were evaluated as "C", and the moire pattern of example 8 was evaluated as "D".

The moire pattern of comparative example 1 was evaluated as "E".

It is considered that since the plurality of 3 rd cell mesh patterns MP3 of the electrode member for a touch panel of comparative example 1 are arranged orderly and regularly in the 1 st direction D1 and the 2 nd direction D2, the plurality of 3 rd cell mesh patterns MP3 and the orderly and orderly pixel patterns of the liquid crystal display module are likely to interfere with each other, and moire fringes are likely to be visually recognized.

As is clear from the results of the moire evaluation, the intersection angle R1 between the straight line L1 connecting the center points C1 and C2 of the 23 rd cell patterns MP3 adjacent to each other in the 1 st direction D1 and the 1 st direction D1 and the intersection angle B2 between the straight line L3 connecting the center points C3 and C4 of the 23 rd cell patterns MP3 adjacent to each other in the 2 nd direction D2 and the 2 nd direction D2 are preferably 0.1 degrees or more and 2.9 degrees or less, more preferably 0.3 degrees or more and 2.7 degrees or less, and still more preferably 0.7 degrees or more and 2.2 degrees or less. It is found that the moire was not easily visually recognized since the intersection angles R1 and B2 were within these ranges.

Claims (16)

1. An electrode member for a touch panel, which has a plurality of cell patterns that are laid over by intersecting, in a plan view, a plurality of 1 st metal thin wires that extend in a 1 st direction and a plurality of 2 nd metal thin wires that extend in a 2 nd direction that intersects the 1 st direction,

it is characterized in that the preparation method is characterized in that,

a straight line connecting respective center points of 2 unit cell patterns adjacent in the 1 st direction extends in a direction intersecting the 1 st direction,

a straight line connecting center points of 2 unit cell patterns adjacent in the 2 nd direction extends in a direction intersecting the 2 nd direction.

2. The electrode member for a touch panel according to claim 1,

the straight lines connecting the center points of 2 unit cell patterns adjacent in the 1 st direction intersect at an angle of 0.1 degrees or more and 2.9 degrees or less with respect to the 1 st direction,

the straight lines connecting the center points of the 2 unit cell patterns adjacent in the 2 nd direction intersect at an angle of 0.1 degrees or more and 2.9 degrees or less with respect to the 2 nd direction.

3. The electrode member for a touch panel according to claim 1 or 2,

the unit cell pattern has a diamond shape.

4. The electrode member for a touch panel according to claim 3,

the length of 1 side of the unit grid pattern is more than 150 μm and less than 350 μm.

5. The electrode member for a touch panel according to claim 1 or 2,

the 1 st fine metal wire and the 2 nd fine metal wire have a line width of 1 μm or more and 10 μm or less.

6. The electrode member for a touch panel according to claim 1 or 2,

the 1 st and 2 nd fine metal wires are made of copper.

7. The electrode member for a touch panel according to claim 1 or 2,

and a transparent insulating member is also provided,

the 1 st fine metal wire and the 2 nd fine metal wire are disposed on both surfaces of the transparent insulating member, respectively.

8. The electrode member for a touch panel according to claim 5,

and a transparent insulating member is also provided,

the 1 st fine metal wire and the 2 nd fine metal wire are disposed on both surfaces of the transparent insulating member, respectively.

9. The electrode member for a touch panel according to claim 7,

the transparent insulating member is composed of a resin substrate.

10. The electrode member for a touch panel according to claim 8,

the transparent insulating member is composed of a resin substrate.

11. The electrode member for a touch panel according to claim 7,

further comprises a resin substrate, and a resin substrate,

the 1 st fine metal wire, the 2 nd fine metal wire, and the transparent insulating member are disposed on one surface of the resin substrate.

12. The electrode member for a touch panel according to claim 8,

further comprises a resin substrate, and a resin substrate,

the 1 st fine metal wire, the 2 nd fine metal wire, and the transparent insulating member are disposed on one surface of the resin substrate.

13. The electrode member for a touch panel according to claim 7,

further comprises a glass substrate,

the 1 st fine metal wire, the 2 nd fine metal wire, and the transparent insulating member are disposed on one surface of the glass substrate.

14. The electrode member for a touch panel according to claim 8,

further comprises a glass substrate,

the 1 st fine metal wire, the 2 nd fine metal wire, and the transparent insulating member are disposed on one surface of the glass substrate.

15. A touch panel comprising the electrode member for a touch panel according to any one of claims 1 to 14.

16. An image display device comprising the touch panel according to claim 15.

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