JP2011018194A - Sensor panel for large-size display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sensor panel for a large-size display, allowing increase of size of the display by reducing a resistance value of electroconductive pattern layers.SOLUTION: In the sensor panel for the large-size display, a pair of laminated sheets 1, 1A facing each other are adhered by a light-transmissive insulating adhesive layer 2. Each laminated layer 1, 1A is formed from an insulating transparent sheet 3 having optical transparency, and a plurality of electroconductive pattern layers 5 bonded to the opposite face of the transparent sheet 3 and to be bonded to the insulating adhesive layer 2. The plurality of electroconductive pattern layers 5 are arranged on the opposite face of the transparent sheet 3, and each electroconductive pattern layer 5 has a metal mesh structure. Because using the electroconductive pattern layers 5 each of the metal mesh structure having a low resistance value, the resistance value of each electroconductive pattern layer 5 is reduced even if the size of the display increases to contribute to the increase of the size of the display.

Description

  The present invention relates to a sensor panel for a large display that enables input operations such as the Internet and mail.

  In recent years, monitors have been developed and manufactured that give a touch panel function to a display and can easily obtain information desired by a touch operation. Although not shown, this type of monitor includes an insulating transparent sheet and a conductive pattern layer formed on the surface of the transparent sheet, and the transparent sheet is formed of light-transmitting polyethylene terephthalate. Is formed of a transparent ITO film, and realizes a predetermined function by a change in capacitance accompanying a finger touch operation (see Patent Documents 1 and 2).

JP 2008-140327 A JP-A-8-83684

  The conventional monitor is configured as described above, and the conductive pattern layer is simply formed of the ITO film. Therefore, when the monitor is enlarged (for example, 30 inches or more), the resistance value of the conductive pattern layer increases. (For example, about 10 kΩ) is invited, and as a result, it is difficult to increase the size of the monitor.

  The present invention has been made in view of the above, and an object of the present invention is to provide a sensor panel for a large display that can reduce the resistance value of a conductive pattern layer and can increase the size of the display.

In the present invention, in order to solve the above problems, a pair of opposed laminated sheets are bonded via a light-transmitting insulating adhesive layer,
The laminated sheet includes an insulating transparent sheet and a plurality of conductive pattern layers that are arranged on the opposite surface of the transparent sheet and adhere to the insulating adhesive layer, and the conductive pattern layer has a metal mesh structure. It is characterized by that.

Note that the insulating adhesive layer can contain transparent spacer particles having insulating properties.
Further, among the pair of laminated sheets, the plurality of conductive pattern layers of one laminated sheet are directed in the X direction, the plurality of conductive pattern layers of other laminated sheets are directed in the Y direction, and each conductive pattern layer is substantially planar. It can be formed in a diamond pattern in which rhombic electrodes are arranged in a line.
Furthermore, the conductive pattern layer can be formed by laminating a metal foil on a light-transmitting base material and partially removing the metal foil to form a mesh structure of a plurality of fine metal wires.

  Here, the pair of opposed laminated sheets in the claims may have the same size or different sizes. Flexibility can be appropriately imparted to the laminated sheet. A plurality of conductive pattern layers can be bonded to the opposite surface of the transparent sheet forming the laminated sheet with a transparent adhesive layer. Moreover, as an insulating adhesive layer, a transparent adhesive, an adhesive, a double-sided adhesive tape, etc. can be used.

  The conductive pattern layer can be appropriately formed in, for example, a straight line, a diagonal line, a continuous chevron or groove pattern, a diamond pattern, or the like. When forming this conductive pattern layer, instead of printing the conductive pattern layer on a transparent sheet, a metal foil is laminated on a transparent substrate, and then this metal foil is etched to form a conductive pattern layer. By doing so, a highly accurate conductive pattern layer with little thickness variation can be obtained.

  When producing a sensor panel for a large display according to the present invention, a plurality of conductive pattern layers are respectively disposed on one side of a pair of transparent sheets to produce a pair of laminated sheets. An adhesive for an insulating adhesive layer is provided on the opposite surface of one of the laminated sheets, and a pair of conductive pattern layers in one laminated sheet and a plurality of conductive pattern layers in the other laminated sheet intersect. If the laminated sheets are stacked and bonded, a sensor panel for a large display can be manufactured.

  According to the present invention, since the conductive pattern layer having a metal mesh structure having a low resistance value is used, the resistance value of the conductive pattern layer can be reduced even if the display is enlarged.

  According to the present invention, it is possible to reduce the resistance value of the conductive pattern layer while maintaining transparency. Therefore, there is an effect that the display can be enlarged.

In addition, if the insulating adhesive layer contains transparent spacer particles having insulating properties, the spacer particles are interposed between the pair of laminated sheets, so that it is possible to prevent damage due to contact between the opposing conductive pattern layers. it can.
Further, if each conductive pattern layer is formed in a diamond pattern in which substantially rhombic electrodes in a plane are arranged in a line, the overlapping area of the conductive pattern layers is small, and the light transmittance of the sensor panel can be improved.

  Furthermore, if the conductive pattern layer is formed by laminating a metal foil on a light-transmitting substrate and partially removing the metal foil to form a mesh structure of a plurality of fine metal wires, for example, the conductive pattern layer Even if a part is damaged, electrical continuity can be ensured by a fine metal wire that is not damaged, and the operation of the sensor panel is hardly hindered.

It is side explanatory drawing which shows typically embodiment of the sensor panel for large sized displays which concerns on this invention. It is a perspective explanatory view showing typically the lamination sheet in the embodiment of the sensor panel for large-sized displays concerning the present invention. It is a perspective explanatory view showing typically the other lamination sheet in the embodiment of the sensor panel for large displays concerning the present invention. It is a perspective explanatory view showing typically a conductive pattern layer in an embodiment of a sensor panel for a large display according to the present invention. It is a fragmentary sectional view showing typically a 2nd embodiment of a sensor panel for large displays concerning the present invention. It is an expansion explanatory view showing typically the conductive pattern layer in the 3rd embodiment of the sensor panel for large-sized displays concerning the present invention, and its metal fine line. It is a plane explanatory view showing typically a plurality of conductive pattern layers of a lamination sheet in a 3rd embodiment of a sensor panel for large displays concerning the present invention. It is plane explanatory drawing which shows typically the some conductive pattern layer of the other laminated sheet in 3rd Embodiment of the sensor panel for large sized displays which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 4, a sensor panel for a large display according to the present embodiment includes a pair of laminated sheets 1 and 1A as an insulating adhesive layer. 2 is formed by arranging a plurality of conductive pattern layers 5 bonded to the insulating adhesive layer 2 on the transparent sheet 3 and arranging each conductive pattern layer 5 as a metal. The mesh structure is made of, and a predetermined function is realized by a change in capacitance accompanying a finger touch operation as a conductor.

  As shown in FIGS. 1 to 3, the pair of laminated sheets 1 and 1A are both formed to have the same size and thickness, and are bonded to each other. It is installed in the plasma display. In the pair of laminated sheets 1 and 1A, a coat layer and a protective noise layer (not shown) are appropriately laminated, and the laminated sheet 1 or the laminated sheet 1A is touched with a finger.

  As shown in FIG. 1, the insulating adhesive layer 2 is made of, for example, a light-transmitting acrylic adhesive or silicone-based adhesive, and one laminated sheet 1 at the time of bonding the pair of laminated sheets 1 and 1A. Is thinly screen-printed or coated on the opposite surface, and is adjusted to a thickness of about 15 μm after drying and curing.

  As shown in FIG. 1 to FIG. 3, each laminated sheet 1, 1 </ b> A is transparent on an insulating transparent sheet 3 having optical transparency and a flat opposing surface facing the other transparent sheet 3. And a plurality of conductive pattern layers 5 bonded to the insulating adhesive layer 2 through the adhesive layer 4.

  The transparent sheet 3 is formed into a transparent planar rectangle having a thickness of about 125 μm using, for example, a material such as polyethylene terephthalate (PET) or acrylic that is stable to light and heat, and flexibility is selectively imparted. The adhesive layer 4 for the conductive pattern layer 5 is laminated on the opposite surface. This adhesive layer 4 is made of a light-transmitting acrylic adhesive, silicone adhesive, etc., like the insulating adhesive layer 2, and is thinly screen-printed or applied to the opposite surface of the transparent sheet 3, The thickness is about 15 μm after drying and curing.

  The plurality of conductive pattern layers 5 are oriented in the X direction when formed on one laminated sheet 1 out of the pair of laminated sheets 1 and 1A, and in the Y direction when formed on the other laminated sheet 1A. Directed to. The plurality of conductive pattern layers 5 are formed by being arranged in a line at a predetermined interval on the opposing surface of the transparent sheet 3, and are electrically connected to a controller (not shown) so that a predetermined voltage is uniformly applied. As a result, a uniform electric field is formed.

  Each conductive pattern layer 5 is not particularly limited as long as it does not hinder the viewing of a large display. For example, a metal foil having a low resistance value is bonded to the surface of an insulating base material 6 having optical transparency. By laminating and bonding via an agent, the metal foil is partially etched to form a mesh structure of a plurality of fine metal wires 7 (see FIG. 4). The substrate 6 is finally processed into an elongated straight line having a thickness of about 125 μm using a sheet material such as polyethylene terephthalate.

  Although it does not restrict | limit especially as metal foil, For example, the foil film | membrane about 10 micrometers in thickness which consists of gold | metal | money, silver, copper, aluminum etc. is used. The adhesive is made of an acrylic adhesive, a silicone adhesive, or the like, like the insulating adhesive layer 2, and is thinly screen-printed or applied to the substrate 6, and has a thickness of about 15 μm after drying and curing. The

  Such a conductive pattern layer 5 is formed by laminating and bonding a metal foil to the surface of the base sheet, and chemically etching an unnecessary portion of the metal foil to form a mesh structure with a plurality of fine metal wires 7, Then, it manufactures by cut | disconnecting the sheet | seat for base materials to predetermined magnitude | size and length, and obtaining the base material 6 of a metal mesh structure.

  In the above, when manufacturing a sensor panel for a large display, in order to manufacture a pair of laminated sheets 1 and 1A, first, a metal foil is laminated and bonded to the surface of the base sheet, and the unnecessary portion is chemically treated. Etching is performed to form a mesh structure with a plurality of fine metal wires 7, and the base sheet is cut into a predetermined size and length to produce a plurality of conductive pattern layers 5.

  When the plurality of conductive pattern layers 5 are manufactured in this way, two transparent sheets 3 cut to the same size are prepared, and the adhesive for the adhesive layer 4 is applied to one side which is the opposite surface of each transparent sheet 3. A plurality of conductive pattern layers 5 are laminated and adhered to the adhesive in the X direction or the Y direction, and the adhesive sheet 4 and the plurality of conductive pattern layers 5 are integrated by drying and curing the adhesive to form the laminated sheets 1 and 1A. Make a pair.

  When a pair of laminated sheets 1 and 1A is obtained, an adhesive for the insulating adhesive layer 2 is applied to the opposing surface of either one of the pair of laminated sheets 1 and 1A to entrain air. Carefully, a pair of laminated sheets 1 and 1A are stacked and firmly bonded, and the conductive pattern layer 5 in the XY direction is laminated and crossed through the insulating adhesive layer 2, and then the insulating bonding is performed by drying and curing the adhesive. If the layer 2 is formed, a sensor panel for a large display can be manufactured.

  According to the above configuration, instead of using a conductive pattern layer made of an ITO film which has a high resistance value and is easy to break, a metal conductive pattern layer 5 having a low resistance value is used. The resistance value of the conductive pattern layer 5 can be remarkably reduced (for example, about 5 to 8Ω), and as a result, not only the display can be reduced in size but also greatly increased in size (for example, 50 inches or more).

  Even if a crack occurs in a part of the elongated conductive pattern layer 5, each conductive pattern layer 5 is not a simple mesh structure, but a mesh structure with a plurality of fine metal wires 7. Conduction can be ensured by the fine metal wires 7 that do not reach, and there is no hindrance to the touch operation.

  In addition, by forming the conductive pattern layer 5 in a mesh structure of a plurality of fine metal wires 7, the resistance becomes low, there is no problem even if the wires are partially disconnected, and the aperture ratio is increased, and the visibility and transmittance are increased. improves. Further, when the sensor panel is manufactured, the adhesive for the insulating adhesive layer 2 is filled between the plurality of conductive pattern layers 5 without any gaps, so that air entrainment is prevented to prevent hot spots and adhesive force is increased. Can be improved.

  In addition, the conductive pattern layer 5 is not directly printed on the opposing surface of the transparent sheet 3 but is formed by laminating a metal foil on a light-transmitting base material sheet and performing an etching process, thereby conducting a conductive mesh structure. Since the pattern layer 5 is obtained, the variation in the thickness of the conductive pattern layer 5 is very small compared to printing. Furthermore, the detection accuracy can be remarkably improved by manufacturing the conductive pattern layer 5 with high accuracy.

Next, FIG. 5 shows a second embodiment of the present invention. In this case, the insulating adhesive layer 2 for bonding the pair of laminated sheets 1 and 1A contains transparent spacer beads 10, When the conductive pattern layer 5 in the XY direction is stacked, the contact between the conductive pattern layer 5 in the X direction and the conductive pattern layer 5 in the Y direction is suppressed and prevented.
The spacer beads 10 are formed using, for example, an insulating resin, and are mixed in a large number with the adhesive for the insulating adhesive layer 2. The other parts are substantially the same as those in the above embodiment, and thus description thereof is omitted.

  In the present embodiment, the same effect as the above embodiment can be expected, and the spacer beads 10 are interposed between the pair of opposed laminated sheets 1 and 1A to secure the distance. It is clear that short circuit of the conductive pattern layer 5 in the direction can be prevented. Moreover, since the spacer beads 10 are blended in the adhesive for the insulating adhesive layer 2, even if the viscosity of the adhesive is low and the fluidity is high, it can be expected to prevent a short circuit of the conductive pattern layer 5 in the XY direction.

Next, FIGS. 6 to 8 show a third embodiment of the present invention. In this case, each conductive pattern layer 5 is arranged in a line through a conductive line 12 having a short rhombic electrode 11. It is formed in a diamond pattern, and the overlapping of the conductive pattern layer 5 in the X direction and the conductive pattern layer 5 in the Y direction is suppressed at the intersection of the conductive pattern layers 5 in the XY direction.
The conductive pattern layer 5 is formed in a mesh structure with a plurality of fine metal wires 7 having a low resistance value, as in the above embodiment. The other parts are substantially the same as those in the above embodiment, and thus description thereof is omitted.

  Also in this embodiment, the same effect as the above embodiment can be expected, and each conductive pattern layer 5 is formed not in a straight line but in a diamond pattern, so that the electrode 11 of the conductive pattern layer 5 in the X direction is formed in the Y direction. The electrodes 11 of the conductive pattern layer 5 are adjacent to each other without overlapping. Therefore, it is clear that the overlapping area of the conductive pattern layers 5 in the XY directions is extremely small, and a significant improvement in the light transmittance of the sensor panel can be expected. Further, the detection accuracy of the conductive pattern layer 5 can be remarkably improved.

  In addition, the insulating adhesive layer 2 of the said embodiment is good also as a double-sided adhesive tape etc. which have a light transmittance. Moreover, you may apply | coat an adhesive agent to the back surface of each conductive pattern layer 5, and may adhere | attach, without apply | coating the adhesive agent for adhesive bond layers 4 to the single side | surface of the transparent sheet 3. FIG. In the above-described embodiment, the plurality of conductive pattern layers 5 are each formed in a straight line. However, at least a part of the plurality of conductive pattern layers 5 is bent or curved, and a region where the plurality of conductive pattern layers 5 and the fingers are opposed to each other. May be expanded to improve detection accuracy.

  In the mesh structure of the above embodiment, the eyes can be circular, triangular, rectangular, polygonal, or the like. Moreover, in the said embodiment, although the transparent spacer bead 10 was contained in the insulating adhesive layer 2 which adhere | attaches a pair of lamination sheet 1 * 1A, as an alternative, the conductive pattern layer 5 which is an electrode part is previously coated, Spacers can also be printed in a dot shape. Further, the sensor panel for a large display may have a straight flat plate structure or an arc-shaped curved structure, and is not intended for home use or business use.

  Furthermore, the sensor panel of the large display can be formed not by the pair of laminated sheets 1 and 1A but by the single transparent sheet 3. In this case, a plurality of conductive pattern layers 5 are arranged on both the front and back surfaces of the transparent sheet 3 via the light-transmitting insulating adhesive layer 2, and the plurality of conductive pattern layers 5 on the surface are directed in the X direction or the Y direction. The plurality of conductive pattern layers 5 on the back surface may be oriented in the Y direction or X direction, and each conductive pattern layer 5 may be formed in a metal mesh structure. By doing so, the sensor panel of the large display can be formed thin.

Next, examples of the present invention will be described together with comparative examples.
〔Example〕
First, in order to produce a conductive pattern layer, a sheet made of polyethylene terephthalate having a thickness of 125 μm is prepared as a sheet for a substrate, and a copper foil having a thickness of 10 μm is bonded to the surface of the transparent sheet with an adhesive. Then, the unnecessary portion was chemically etched to form a mesh structure with a plurality of fine metal wires. The thickness of the adhesive after drying and curing was adjusted to 15 μm. Moreover, the mesh structure by a metal fine wire made the distance between patterns 0.3 mm, and made the line | wire width of the metal fine wire 15 micrometers.

  After forming a metal mesh structure in this way, the sheet was cut into a predetermined size and length to produce a plurality of transparent conductive pattern layers (surface resistance value <0.1Ω / □). For the plurality of conductive pattern layers, five types for the X direction were manufactured with a size of 660 × 6 mm, and five types for the Y direction were manufactured with a size of 370 × 6 mm.

  Next, two transparent sheets of the same size are prepared, an adhesive for the adhesive layer is laminated on one side of each transparent sheet, and a plurality of conductive pattern layers are lined up in this adhesive in the X or Y direction. A pair of laminated sheets was produced by laminating and adhering to each other and integrating the adhesive layer and the plurality of conductive pattern layers by drying and curing the adhesive.

  After manufacturing a pair of laminated sheets, an adhesive for an insulating adhesive layer is applied to the facing surface of one of the laminated sheets, and the pair of laminated sheets are stacked and firmly bonded together, and XY The conductive pattern layer in the direction is orthogonally crossed through the insulating adhesive layer, and then the adhesive is dried and cured to form a transparent insulating adhesive layer having a thickness of 15 μm. Manufactured.

[Comparative Example]
A polyethylene terephthalate film having a thickness of 100 μm was prepared, and ITO, which is a mixed oxide of indium oxide and tin oxide, was formed on one side of the film by a direct current magnetron sputtering method to obtain a transparent conductive thin film. The transparent conductive thin film had a thickness of 40 nm and a surface resistance value of 150Ω / □.

  When a transparent conductive thin film was obtained, the conductive thin film was etched to form a conductive pattern layer. Otherwise, a sensor panel for a large display for 30 inches was manufactured in the same manner as in the example.

When the resistance value of the manufactured sensor panel for a large display was measured, in the case of the conductive pattern layer of the example, the X direction was 660 × 6 mm and 8Ω, and the Y direction was 370 × 6 mm and 5Ω, indicating a low value. It was.
On the other hand, in the case of the conductive pattern layer of the comparative example, it was 16.5 kΩ at 660 × 6 mm, showing a really high numerical value.

DESCRIPTION OF SYMBOLS 1 Laminated sheet 1A Laminated sheet 2 Insulating adhesive layer 3 Transparent sheet 4 Adhesive layer 5 Conductive pattern layer 6 Base material 7 Metal fine wire 10 Spacer beads (spacer particles)
11 electrodes

Claims (4)

A sensor panel for a large display in which a pair of opposed laminated sheets are bonded via a light-transmitting insulating adhesive layer,
The laminated sheet includes an insulating transparent sheet and a plurality of conductive pattern layers that are arranged on the opposite surface of the transparent sheet and adhere to the insulating adhesive layer, and the conductive pattern layer has a metal mesh structure. A sensor panel for large displays.   The sensor panel for a large display according to claim 1, wherein the insulating adhesive layer contains transparent spacer particles having insulating properties.   Of the pair of laminated sheets, a plurality of conductive pattern layers of one laminated sheet are directed in the X direction, a plurality of conductive pattern layers of other laminated sheets are oriented in the Y direction, The sensor panel for a large display according to claim 1 or 2, wherein the electrodes are formed in a diamond pattern arranged in a line.   4. The conductive pattern layer is formed by laminating a metal foil on a light-transmitting substrate and partially removing the metal foil to form a mesh structure of a plurality of fine metal wires. Sensor panel for large displays.

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