JP2021157421A - Touch screen and display device including the touch screen - Google Patents

Abstract

To solve a problem that the number of cases where a near-field communication (NFC) function is added to a display device in order to read/write data by putting a non-contact type IC card over the display device having a touch screen increases and a communication antenna is normally arranged in a back surface of the display device in many cases, and accordingly, the magnetic flux density is reduced by a shield between the antenna and an IC card, so that a communication distance cannot be increased.SOLUTION: A touch screen according to this disclosure is a screen in which an antenna is formed on a touch screen surface by connecting a plurality of conductive patterns formed at the same time when wires forming the touch screen are formed. The touch screen exerts an effect that a communication distance can be increased without adding a space for providing the antenna.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a touch screen having an antenna used for proximity wireless communication and a display device including the touch screen.

Conventionally, a touch panel that detects an input operation by an indicator body such as a finger has been known, and is attracting attention as one of excellent interface means. Such a touch panel includes a touch screen using various methods such as a resistance film method and a capacitance method as an element for detecting the position of touch by a finger or the like. The touch screen includes a plurality of sensors. The touch panel detects a touch on the touch screen by an indicator such as a finger, and specifies coordinates indicating the position where the touch is performed.

The touch panel is often mounted on the display device. As a result, the touch panel provides an excellent user interface of an information processing device that replaces a mechanical keyboard, mouse, or the like.

Commercially available touch panel methods include a resistive film method and a capacitance method. The projected capacitance type touch panel, which is one of the capacitance methods, can detect touch even when the front surface of the touch sensor panel is covered with a protective glass having a thickness of several mm. It has the advantage of having high robustness.

For this reason, the projection type capacitance type touch panel is adopted in the input unit provided in the mobile communication device, the automatic teller machine (ATM) installed in the financial institution, the touch input device provided in the car navigation device, and the like. NS.

On the other hand, in recent years, with the spread of near field communication (NFC), a capacitive touch panel device has been adopted, and a non-contact IC card and a radio frequency identification device (RFID) have been adopted. ) A touch input device that detects a wireless communication device such as a tag and wirelessly communicates with the detected wireless communication device has also been proposed.

The contact type IC card has a loop-shaped antenna coil and an IC chip built in the card, and data can be exchanged by wireless communication by holding the card over a magnetic field generated by an IC card reader / writer. This contactless IC card is used for railway ticket gates and entry / exit management. Further, there are a plurality of types of contactless IC cards depending on the distance at which data can be read and written, the communication method, and the like.

Currently, the mainstream type is that the display device and the IC card reader / writer are located at different positions, but from the viewpoint of space saving, design improvement, and usability improvement, for example, a liquid crystal display device (LCD: Liquid Crystal) is a display device. It has been proposed to incorporate the Near Field Communication (NFC) function inside the Display). (See, for example, Patent Documents 1 and 2)

Japanese Unexamined Patent Publication No. 2012-064123 International Application Publication WO2017 / 069114

In the technology disclosed in Patent Document 1, when the NFC antenna is incorporated in the LCD, the antenna should be arranged on the back surface of the display device or between the reflector of the backlight and the rear frame in order not to affect the display. Can be considered.

In such a case, compared to conventional products in which the display device and the IC card reader / writer are located at different positions, there is a backlight, LCD, touch panel, etc. between the NFC antenna and the non-contact IC card. There is a problem that the magnetic flux is weakened by these shields and the communication distance is lowered. Further, in order to strengthen the magnetic flux with such a structure, it is necessary to increase the size of the NFC antenna, which leads to high cost.

Further, in the technique disclosed in Patent Document 2, the touch panel sensor is divided to form an NFC antenna pattern, but it is conceivable that the touch panel cannot be operated in some parts with such a structure.

This disclosure is made in order to solve the above-mentioned problems, and it is said that the communication distance is shortened due to the weakening of the magnetic flux between the antenna and the non-contact IC card, and the influence on the display of the display device. An object of the present invention is to provide a touch panel and a display device capable of suppressing both problems.

The touch screen according to the present disclosure includes row direction wiring and column direction wiring formed by being laminated on a transparent substrate via an insulating layer, and the same layer as the row direction wiring, which is electrically the same as the row direction wiring. A first floating electrode that is not connected to the first floating electrode, a second floating electrode that is in the same layer as the row direction wiring and is not electrically connected to the row direction wiring, a part of the first floating electrode, and the above. It is a touch screen having an antenna pattern formed by connecting a part of a second floating electrode.

According to the present disclosure, a good communication device can be provided by providing the touch screen itself with an NFC antenna function. Moreover, since it is not necessary to change the manufacturing process of the touch screen, the cost does not increase. Further, since the electrode pattern of the touch screen is not divided, it is possible to provide a touch screen with a built-in NFC antenna that does not affect the touch operation.

It is a perspective view which shows the layer structure of the touch screen which concerns on Embodiment 1. FIG. It is a top view which shows the structure of the touch screen which concerns on Embodiment 1. FIG. It is an enlarged view of the lower electrode of the area A of the touch screen which concerns on Embodiment 1. FIG. It is an enlarged view of the upper electrode of the area A of the touch screen which concerns on Embodiment 1. FIG. It is an enlarged view of the area A of the touch screen which concerns on Embodiment 1. FIG. It is an enlarged view of the lower floating electrode of the A region of the touch screen which concerns on Embodiment 1. FIG. FIG. 5 is an enlarged view of an upper floating electrode in the A region of the touch screen according to the first embodiment. It is an enlarged view of the lower floating electrode and the upper floating electrode of the A region of the touch screen which concerns on Embodiment 1. FIG. It is an enlarged view of the upper electrode of the B region of the touch screen which concerns on Embodiment 1. FIG. It is an enlarged view of the upper electrode of the C region of the touch screen which concerns on Embodiment 1. FIG. It is an enlarged view of the upper electrode and the lower electrode of the D region of the touch screen which concerns on Embodiment 1. FIG. It is sectional drawing of the connection part of the upper electrode and the lower electrode which concerns on Embodiments 1 and 2. It is an enlarged view of the upper electrode of the B region of the touch screen which concerns on Embodiment 2. FIG. It is an enlarged view of the upper electrode of the C region of the touch screen which concerns on Embodiment 2. FIG. It is an enlarged view of the upper electrode and the lower electrode of the D region of the touch screen which concerns on Embodiment 2. FIG. It is a perspective view which shows the layer structure of the touch screen which concerns on Embodiment 3. FIG. It is a top view which shows the structure of the touch screen which concerns on Embodiment 3. FIG.

Embodiment 1
The touch screen 1 according to the first embodiment of the present disclosure will be described with reference to FIGS. 1 to 12. The touch screen 1 according to the first embodiment will be described as a projection type capacitance type touch screen, but the present invention is not limited to this.

FIG. 1 is a perspective view showing a layered structure of the touch screen 1 according to the first embodiment. In FIG. 1, the lowermost layer of the touch screen 1 is a transparent substrate 10 made of a transparent glass material or a transparent resin. A lower electrode 20 is arranged on the transparent substrate 10. As will be described later, the lower electrode 20 is electrically connected to the row direction wiring 21 that contributes to detection as a tat panel, and is in the same layer as the row direction wiring 21, and the row direction wiring 21 is electrically connected. Includes a lower floating electrode 22, which is a first floating electrode that is not connected to.

Further, the interlayer insulating film 11 is arranged so as to cover the lower electrode 20. The interlayer insulating film 11 is a transparent insulating film having a silicon nitride film, a silicon oxide film, or the like. An upper electrode 30 is arranged on the upper surface of the interlayer insulating film 11. As will be described later, the upper electrode 30 is in the same layer as the row direction wiring 31 which is electrically connected and contributes to the detection, and the row direction wiring 31, and is not electrically connected to the row direction wiring 31. The upper floating electrode 32, which is the floating electrode of No. 2, is included.

Further, a protective film 12 is arranged on the upper surface of the interlayer insulating film 11 so as to cover the upper electrode 30. Like the interlayer insulating film 11, the protective film 12 is a translucent insulating film such as a silicon nitride film. An adhesive material 13 is arranged on the upper surface of the protective film 12. Further, in order to protect the touch screen 1, a transparent substrate 14 forming the surface of the touch screen 1 is adhered to the upper surface of the adhesive material 13 by the adhesive material 13. For example, a transparent glass material or a transparent resin is applied to the transparent substrate 14.

The lower electrode 20 includes a plurality of row-direction wirings 21 made of a transparent wiring material such as ITO (Indium Tin Oxide) or a metal wiring material such as aluminum or copper or silver. Further, the upper electrode 30 includes a plurality of row direction wirings 31 made of a transparent wiring material such as ITO or a metal wiring material such as aluminum, copper or silver, similarly to the lower electrode 20.

In the first embodiment, a multilayer structure composed of an aluminum alloy layer and a nitrided layer thereof is applied to each of the column direction wiring 31 and the row direction wiring 21 described above. As a result, the wiring resistance can be reduced, and the reflectance of light in the detectable area can be reduced. Further, in the first embodiment, the column direction wiring 31 is arranged on the row direction wiring 21, but the row direction wiring 21 may be arranged on the column direction wiring 31 by reversing the positional relationship between them. good.

Further, the materials of the column direction wiring 31 and the row direction wiring 21 are unified into a multi-layer structure composed of an aluminum alloy layer and a nitrided layer thereof, but these materials do not have to be unified. For example, the material of the column direction wiring 31 may be a multilayer structure composed of an aluminum alloy layer and a nitrided layer thereof, and the row direction wiring 21 may be a transparent wiring material such as ITO.

Further, in the first embodiment, the column direction wiring 31 is arranged on the row direction wiring 21, but these are arranged on the same layer so that the row direction wiring 21 and the column direction wiring 31 overlap in a plan view. An interlayer insulating film 11 may be provided between the wirings only in the portion to electrically separate the wirings.

The user touches the transparent substrate 14 forming the surface of the touch screen 1 with an indicator such as a finger to perform an operation. When the indicator touches the transparent substrate 14, a capacitive coupling (touch capacitance) is generated between the indicator and at least one of the row direction wiring 21 and the column direction wiring 31 at the lower part of the transparent substrate 14. In the mutual capacitance method, at what position in the detectable area the indicator touches based on the change in mutual capacitance between the row direction wiring 21 and the column direction wiring 31 that occurs in response to the occurrence of the touch capacitance. Is configured to identify.

In FIG. 1, not only the touch screen 1 but also the display element 2 and the adhesive material 3 are shown by virtual lines (dashed-dotted lines). Although not shown, normally, a controller board on which a detection processing circuit is mounted is connected to the touch screen 1 via a flexible board or the like to form a touch panel, and the touch panel is combined with a display element. A liquid crystal display element or a display panel such as an LCD (liquid crystal display) panel is applied to the display element 2. The antenna pattern 100 will be described in detail with reference to FIGS. 2 and 2.

FIG. 2 is a plan view showing the configuration of the touch screen 1 according to the first embodiment. In the area A, which is the detectable area of the touch screen 1, a plurality of row direction wirings 21 extending in the horizontal direction (row direction) and a plurality of column direction wirings 31 extending in the vertical direction (column direction) are formed. It is a matrix region formed by overlapping in a plan view. Hereinafter, it is assumed that the plurality of sensor wirings extending along the predetermined extension direction are the row direction wiring 21, and the detectable area is the arrangement area of the row direction wiring 21. .. However, the present invention is not limited to this, and for example, the column directional wiring 31 may be applied instead of the row directional wiring 21, and both the row directional wiring 21 and the column directional wiring 31 may be applied.

Each of the row direction wirings 21 is connected to the terminal 8 for connecting to the external wiring by the lead-out wirings R1 to R6 (plural lead-out wirings). Similarly, each of the row direction wirings 31 is also connected to the terminal 8 for connecting to the external wiring by the lead-out wirings C1 to C8. A shielded wire 4 is formed between the lead-out wirings R1 to R6 and the lead-out wirings C1 to C8, and is connected to a terminal 8 for connecting to an external wiring. Further, the antenna pattern 100 formed inside the region A is also connected to the terminal 8 for connecting to the external wiring by the lead-out wiring N1. The outermost shielded wiring 5 provided outside these wirings is formed, and is connected to the terminal 8 for connecting to the external wiring.

Although the terminals 8 are collectively shown in FIG. 2, different potentials are input to the row direction wiring 21, the column direction wiring 31, and the antenna pattern 100. Further, in the present embodiment, the embodiment in which there is only one antenna pattern will be described, but a plurality of antenna patterns may be formed.

The lead-out wirings R1 to R6 are connected to the end of the row-direction wiring 21 and extend along the outer periphery of the detectable area. Here, when the lead-out wiring R5 reaches the lead-out wiring R6 in the outer peripheral direction of the detectable area, the lead-out wiring R5 extends to the outside of the lead-out wiring R6 (opposite to the detectable area) along the lead-out wiring R6. The lead-out wirings R1 to R4 are also arranged in the same manner as the lead-out wirings R5.

In the first embodiment, the lead-out wirings R1 to R6 are arranged so as to be packed on the outer peripheral side of the detectable area. Similarly, the lead-out wirings C1 to C8 are also arranged so as to be packed on the outer peripheral side of the detectable area in order from the lead-out wiring closest to the terminal 8. By arranging the lead-out wirings R1 to R6 and C1 to C8 as close to the outer peripheral side of the detectable area as possible in this way, the display element 2 on which the touch screen 1 is mounted and the drawers excluding the lead-out wirings R1 and C1 are removed. The fringe capacitance between the wirings R2 to R6 and C2 to C8 can be suppressed.

Hereinafter, the structure of the antenna pattern 100 will be described with reference to FIGS. 3 to 12. In the embodiment of the present disclosure, the lower electrode 20 includes the row direction wiring 21 and the lower floating electrode 22, and the upper electrode 30 includes the column direction wiring 31 and the upper floating electrode 32, so that the structure is complicated. Therefore, first, the structure of only the lower layer or only the upper layer is illustrated, and then a drawing in which both are laminated is illustrated and described. Alternatively, the description will be given by showing only the floating electrodes.

FIG. 3 is an enlarged view of the lower electrode 20 in the A region of the touch screen 1 according to the first embodiment. The touch screen 1 is formed of a row direction wiring 21 that is electrically connected as described in a known technique (for example, the structure described in Japanese Patent No. 5875693) and a lower electrode that is not electrically connected to the row direction wiring 21. A floating electrode 22 is provided. (The floating electrode formed by the lower electrode is hereinafter referred to as the lower floating electrode.) The B region in the upper right portion is an area to be described in detail later. Further, in FIG. 3, the row direction wiring 21 is shown by a solid line, and the lower floating electrode 22 is shown by a dotted line. The area of the row direction wiring 21 is shaded for easy display.

The row direction wirings 21 extend in four horizontal directions on the left and right on the drawing, each extending as a pattern having a mesh shape, and each wiring is regularly branched in some places (vertical direction in the drawing). Has a part that extends. The tip of the branch-like portion is not connected to the adjacent row direction wiring 21. On the other hand, the lower floating electrode 22 is formed in a region that fills the region in which the row direction wiring 21 is not formed.

The row direction wiring 21 and the lower floating electrode 22 are separated by a boundary having a gap and are not connected to each other. Here, since the row direction wiring 21 extends in the left and right horizontal directions on the drawing, the patterns of the lower floating electrodes 22 are also separated from each other in the vertical direction on the upper and lower sides on the drawing. On the other hand, the lower floating electrodes 22 are integrally connected to each other in the left and right horizontal directions on the drawing via a region in which the row direction wiring 21 is not formed.

The antenna pattern is indicated by a thick dotted line as the antenna pattern region 101. In FIG. 3, when the starting point is the upper left portion in the A region, the antenna pattern extends clockwise from the starting point and ends near the center left side of the A region. As will be described later, in the first embodiment, the terminal portion and the start point can be connected to the terminal 8 shown in FIG.

In FIG. 3, the antenna pattern is drawn so as to include both the lower floating electrode 22 and the row direction wiring 21, but in reality, as will be described later, the antenna pattern includes only a part of each of the lower floating electrode 22 and the upper floating electrode 32. It is configured in. Further, as will be described in detail later, the antenna pattern region 101 is separated from the other patterns by the dividing portion between the lower floating electrodes 22.

FIG. 4 is an enlarged view of the upper electrode in the A region of the touch screen 1 according to the first embodiment. FIG. 4 includes a row direction wiring 31 that is electrically connected and an upper floating electrode 32 that is not electrically connected to the row direction wiring 31. The C region on the upper right is an area to be described in detail later, and is the same as the B region in terms of physical position. Further, in FIG. 4, the row direction wiring 31 is shown by a solid line, and the upper floating electrode 32 is shown by a dotted line. In order to display it in an easy-to-understand manner, the area of the column direction wiring 31 is shaded.

The width of the solid line of the column direction wiring 31 in FIG. 4 is shown to be narrower than the width of the solid line of the row direction wiring 21 in FIG. Similarly, the width of the dotted line of the upper floating electrode 32 is shown to be narrower than the width of the dotted line of the lower floating electrode 22 in FIG.

Six row-direction wirings 31 extend vertically on the drawing, each extending as a pattern having a mesh shape. On the other hand, the upper floating electrode 32 is formed in a region that fills the region in which the row direction wiring 31 is not formed.

The row direction wiring 31 and the upper floating electrode 32 are separated by a boundary having a gap and are not connected to each other. Here, since the row direction wiring 31 extends in the vertical direction in the vertical direction on the drawing, the patterns of the upper floating electrodes 32 are also separated from each other in the horizontal direction on the left and right on the drawing. On the other hand, the upper floating electrodes 32 are connected as a unit in the vertical direction in the vertical direction on the drawing.

The antenna pattern is shown by a thick dotted line as the antenna pattern region 101, as in FIG. In FIG. 4, the antenna pattern is drawn so as to include both the upper floating electrode 32 and the row direction wiring 31, but in reality, as will be described later, the antenna pattern includes only a part of each of the upper floating electrode 32 and the lower floating electrode 22. It is configured in. Further, as will be described in detail later, the antenna pattern region 101 is separated from the other patterns by the dividing portion between the upper floating electrodes 32.

FIG. 5 is an enlarged view of the touch screen 1 according to the first embodiment in the A region. Further, FIG. 5 is also a diagram in which FIGS. 3 and 4 are superimposed. As described with reference to FIGS. 3 and 4, the lower floating electrode 22 is separated from each other in the vertical direction, and the upper floating electrode 32 is separated from each other in the left-right and horizontal directions. The upper right D region is an area to be described in detail later, and is the same as the B region in terms of physical position.

In FIG. 5, the antenna pattern region 101 is shown, which is formed by the lower floating electrode 22 and the upper floating electrode 32 as described above. Specifically, as will be described in detail later, in the region where the lower floating electrode 22 and the upper floating electrode 32 overlap in the antenna pattern region 101, a contact hole (described later) is formed in the interlayer insulating film 11, and the lower floating electrode 22 and the upper portion are formed. By connecting the floating electrode 32, it is possible to form an antenna pattern in the A region without interfering with the column direction wiring 31 and the row direction wiring 21.

In order to further explain the first embodiment in an easy-to-understand manner, in FIG. 6 and below, only the floating electrodes will be described with reference to the drawings. This is because the antenna pattern consists of only a part of each floating electrode.

FIG. 6 is a diagram showing a lower electrode 20 in the A region of the touch screen 1 according to the first embodiment. In this figure, only the lower floating electrode 22 in the antenna pattern region 101 is shown in order to show the relationship with the antenna pattern in an easy-to-understand manner. Each pattern is separated and there are areas that are not connected to each other.

FIG. 7 is a diagram showing an upper electrode 30 in the A region of the touch screen 1 according to the first embodiment. In this figure, only the upper floating electrode 32 in the antenna pattern region 101 is shown in order to show the relationship with the antenna pattern in an easy-to-understand manner. Each pattern is separated and there are areas that are not connected to each other.

FIG. 8 is a diagram showing an area A of the touch screen 1 according to the first embodiment. In this figure, only the lower floating electrode 22 and the upper floating electrode 32 in the antenna pattern region 101 are shown in order to show the relationship with the antenna pattern in an easy-to-understand manner. The region where the network shape is densely present in some places indicates a situation in which the lower floating electrode 22 and the upper floating electrode 32 are superimposed so as to complementarily form a fine mesh shape.

In FIGS. 6 and 7, each pattern was separated and isolated at each floating electrode, but in FIG. 8, there is no separation break, and as described above, an antenna pattern that winds around in the region A is formed. It can be seen that it is formed.

As a result, if the lower floating electrode 22 and the upper floating electrode 32 can be connected, by combining a part of both electrodes, the loop-shaped antenna does not interfere with the column direction wiring 31 and the row direction wiring 21. It is inferred that a pattern can be formed.

Specifically, as will be described in detail later, in the region where the lower floating electrode 22 and the upper floating electrode 32 overlap, a loop-shaped electrically connected loop is formed by forming a contact hole (described later) in the interlayer insulating film 11. It is formed as an antenna pattern. In FIG. 8, the region where the lower floating electrode 22 and the upper floating electrode 32 overlap corresponds to a region where the mesh shape has a high density, as described above.

Next, the formation and division points of the antenna pattern will be described in detail with reference to FIGS. 9 and 9 and below. FIG. 9 is a diagram showing a region B of FIG. 3 according to the first embodiment. FIG. 9 illustrates a situation in which the row direction wiring 21 and the lower floating electrode 22 are separated via the divided portion.

The divided portions in which the electrodes are divided are indicated by four dotted lines 23a, 23b, 23c, and 23d. That is, the mesh-shaped lower floating electrodes are separated from each other on both sides of the dotted line. Here, when viewed locally, the mesh-shaped lower floating electrodes are separated from each other through a gap that straddles the divided portions 23a, 23b, 23c, and 23d.

In other words, the divided portion is also a virtual line obtained by connecting the gaps of the wiring. Further, the divided portion corresponds to the pattern edge of the antenna pattern. Therefore, in FIG. 9, it can be said that the antenna patterns 101a and 101c and the antenna pattern 101b are separated via the dividing portions 23b and 23c.

First, as described with reference to FIGS. 3 and 6, the lower floating electrodes 22a and 22e are separated from the lower floating electrodes 22b, 22c and 22d by the presence of the row direction wiring 21. Further, the lower floating electrodes 22b, 22c, and 22d also have portions that are separated from each other via the dividing portions 23b, 23c.

The lower floating electrodes 22b, 22c, and 22d are usually formed integrally except for the region where the row direction wiring 21 is formed, but in the first embodiment of the present disclosure, the lower floating electrodes 22b corresponding to the antenna pattern region are formed. , 22c are separated from the lower floating electrode 22d corresponding to the outside of the antenna pattern region via the dividing portions 23b and 23c.

Similarly, the lower floating electrodes 22a and 22e are also separated from each other via the dividing portion 23a, and only the lower floating electrode 22a contributes as an antenna pattern.

Further, the lower floating electrodes 22a and 22c are separated from each other on the upper side and the lower right side in the drawing, but these are electrically connected by the upper floating electrode 32 as described later, so that the antenna pattern 101c Contributes to the formation of.

FIG. 10 is a diagram showing a region C in FIG. 4 according to the first embodiment. FIG. 10 illustrates a situation in which the row direction wiring 31 and the upper floating electrode 32 are separated via the divided portion.

The divided portion in which the electrodes are divided is indicated by four dotted lines 33a, 33b, 33c, and 33d, and the mesh-shaped upper floating electrodes are separated from each other on both sides of the dotted line. Here, when viewed locally, the mesh-shaped upper floating electrodes are separated from each other through a gap that straddles the divided portions 33a, 33b, 33c, and 33d.

In other words, the divided portion is also a virtual line obtained by connecting the gaps of the wiring. Further, the divided portion corresponds to the pattern edge of the antenna pattern. Therefore, in FIG. 10, it can be said that the antenna patterns 101a and 101c and the antenna pattern 101b are separated via the dividing portions 33b and 33c.

First, as described with reference to FIGS. 4 and 7, the upper floating electrodes 32a and 32e are separated from the upper floating electrodes 32b, 32c, 32d and 32f by the presence of the row direction wiring 31. Further, the upper floating electrodes 32b, 32c, 32d, and 32f also have portions that are separated from each other via the dividing portions 33a, 33b, and 33c.

Specifically, the upper floating electrodes 32b, 32c, 32d, and 32f are usually formed integrally except for the formation region of the column direction wiring 31, but in the first embodiment of the present disclosure, the upper floating electrodes 32b, 32c, 32d, and 32f are formed in the antenna pattern region. The corresponding upper floating electrodes 32b and 32c are separated from the upper floating electrodes 32d and 32f corresponding to the outside of the antenna pattern region via the dividing portions 33a, 33b and 33c.

Similarly, the upper floating electrodes 32a and 32e are also separated from each other via the dividing portion 33a, and only the upper floating electrodes 32a contribute as an antenna pattern.

Further, the upper floating electrodes 32a and 32b are separated from each other on the right side and the upper left part in the drawing, but they are electrically connected by the lower floating electrode 22a shown in FIG. 9 as described later. Contributes to the formation of the antenna pattern 101a.

FIG. 11 is a diagram showing a D region of FIG. 5 according to the first embodiment. FIG. 11 is a diagram in which FIGS. 9 and 10 are superimposed, and shows the positional relationship between the row direction wiring, the lower floating electrode, the column direction wiring, the upper floating electrode, and the antenna pattern.

In FIG. 11, the divided portions 23a, 23b, 23c shown in FIG. 9 coincide with the divided portions 33a, 33b, 33c shown in FIG. 10, respectively. Further, in each of the divided regions, there is a portion where the forming region of the lower bloating electrode and the forming region of the upper floating electrode overlap. Regions 100A1 to 100A4 shown as such overlapping regions will be described below as an example.

In the region 100A1 in the antenna pattern 101b region, the lower floating electrode 22b and the upper floating electrode 32c overlap each other via the interlayer insulating film 11. Specifically, in FIG. 11, the lower floating electrode 22b and the upper floating electrode 32c intersect each other. Here, by forming a contact hole (described later) in the interlayer insulating film 11, the lower floating electrode 22b and the upper floating electrode 32c in the antenna pattern 101b region are electrically connected. The antenna pattern 101b is formed by this connection.

Further, the lower floating electrodes 22a overlap with the upper floating electrodes 32a and 32b, respectively, in the regions 100A2 and 100A3 in the antenna pattern 101a region via the interlayer insulating film 11. Here, by forming contact holes (not shown) in the interlayer insulating film 11 in the regions 100A2 and 100A3, the lower floating electrodes 22a and the upper floating electrodes 32a and 32b in the antenna pattern 101a region are electrically connected. NS.

By this connection, the upper floating electrodes 32a and 32b separated in the right side and the upper left part in FIG. 10 are electrically connected via the contact holes formed in the regions 100A2 and 100A3 and the lower floating electrode 22a. Will be. The antenna pattern 101a is formed by this connection.

Similarly, the upper floating electrodes 32a overlap with the lower floating electrodes 22a and 22c, respectively, in the regions 100A2 and 100A4 in the antenna pattern 101c region via the interlayer insulating film 11. Here, by forming contact holes (not shown) in the interlayer insulating film 11 in the regions 100A2 and 100A4, the upper floating electrodes 32a and the lower floating electrodes 22a and 22c in the antenna pattern 101c region are electrically connected. NS.

By this connection, the lower floating electrodes 22a and 22c separated on the right side and the lower left side in FIG. 10 are electrically connected via the contact holes formed in the regions 100A2 and 100A4 and the upper floating electrode 32a. Will be. The antenna pattern 101c is formed by this connection.

Since the antenna patterns 101a, 101b, and 101c formed in this way are all formed by the lower floating electrode 22 and the upper floating electrode 32, they do not interfere with the column direction wiring 31 and the row direction wiring 21.

Although the region D, which is a part of the region A, has been described with reference to FIG. 11, the remaining antenna patterns do not interfere with the column direction wiring 31 and the row direction wiring 21 by making the same arrangement and connection, and the lower part The floating electrode 22 and the upper floating electrode 32 make it possible to form the floating electrode 22 in the A region.

FIG. 12A is a cross-sectional view of the overlapping region 100A1 of the lower floating electrode 22 and the upper floating electrode 32 in the antenna pattern region according to the first embodiment. FIG. 12B is a cross-sectional view in a region 100B where the upper electrode 20 and the lower electrode 30 overlap each other in a region other than the antenna pattern region.

As shown in FIG. 12A, a contact hole 15 is formed in the interlayer insulating film 11 in the overlapping region 100A1 of the lower floating electrode 22 and the upper floating electrode 32 in the antenna pattern region, and both electrodes are electrically connected to each other. By connecting, it becomes possible to form an antenna pattern. It should be noted that this cross-sectional view is the same in the regions 100A2 to 100A4.

Further, in the overlapping region other than the antenna pattern region, as shown in FIG. 12B, both electrodes are insulated from each other via the interlayer insulating film 11, and thus function as a touch panel.

The antenna pattern 100 thus formed can be appropriately extended and connected to the terminal 8. The end portion arranged in the central portion of the region A may be connected to, for example, an upper floating electrode, routed in parallel with the row direction wiring 31 and extended outside the region A, and connected to the terminal 8.

Further, as the material of the row direction wiring 21 and the column direction wiring 31, a transparent conductive material such as ITO or graphene, or a metal material such as aluminum, chromium, copper or silver can be used. Alternatively, as these materials, alloys such as aluminum, chromium, copper, and silver, or a multilayer structure in which aluminum nitride or the like is formed on these alloys can be used. However, the conductor width and the mesh spacing are not limited to the above description, and may be appropriately changed depending on the application of the touch screen 1 and the like.

<Summary of Embodiment 1>
According to the touch screen 1 according to the first embodiment as described above, it is possible to form an antenna pattern without changing the touch panel pattern, and it is possible to present a good communication environment without increasing the cost. It becomes.

Embodiment 2
Embodiment 2 of the present disclosure will be described with reference to FIGS. 13 to 15. The description of the same embodiment as that described in the first embodiment will be simplified, and the contents different from the first embodiment will be mainly described.

FIG. 13 is a diagram corresponding to the region B of FIG. 3 according to the first embodiment, and shows the divided portion between the row direction wiring 41 and the lower floating electrode 42.

In FIG. 13, similarly to FIG. 9, the lower floating electrode is divided into the lower floating electrodes 42a, 42b, 42c, 42d, and 42e by the divided portion. The divided portions in which the electrodes are divided are indicated by four dotted lines 43a, 43b, 43c, and 43d. That is, the mesh-shaped lower floating electrodes are separated from each other on both sides of the dotted line. Here, when viewed locally, the mesh-shaped lower floating electrodes are separated from each other through a gap that straddles the divided portions 43a, 43b, 43c, and 43d.

In other words, the divided portion is also a virtual line obtained by connecting the gaps of the wiring. Further, the divided portion corresponds to the pattern edge of the antenna pattern. Therefore, in FIG. 13, it can be said that the antenna patterns 101a and 101c and the antenna pattern 101b are separated via the dividing portions 43b and 43c.

First, as described with reference to FIGS. 3 and 6, the lower floating electrodes 42a and 42e are separated from the lower floating electrodes 42b, 42c and 42d by the presence of the row direction wiring 41. Further, the lower floating electrodes 42b, 42c, and 42d also have portions that are separated from each other via the dividing portions 43b, 43c.

The lower floating electrodes 42b, 42c, and 42d are usually formed integrally except for the region where the row direction wiring 41 is formed, but in the second embodiment of the present disclosure, the lower floating electrodes 42b corresponding to the antenna pattern region are formed. , 42c are separated from the lower floating electrode 42d corresponding to the outside of the antenna pattern region via the dividing portions 43b and 43c.

Similarly, the lower floating electrodes 42a and 42e are also separated from each other via the dividing portion 43a, and only the lower floating electrodes 42a contribute as an antenna pattern.

Further, the lower floating electrodes 42a and 42c are separated from each other on the upper side and the lower right side on the drawing, respectively, but they are electrically connected by the upper floating electrode as in the first embodiment. It contributes to the formation of the antenna pattern 101c.

Up to this point, the same as in the first embodiment, but in the second embodiment, the upper floating electrode 42d is not a mesh shape but is separated as an isolated pattern having a cross shape. By making each of them an isolated pattern, it is possible to adjust the capacitance of the floating electrode pattern.

Further, by forming the shape of each isolated pattern as a cross, a mesh shape is formed complementary to the lower floating electrode superposed on the pattern, so that a visual difference from other regions can be suppressed.

FIG. 14 is a diagram showing a divided portion between the row direction wiring 51 and the upper floating electrode 52, and is a diagram corresponding to FIG. 4 according to the first embodiment.

Similar to the first embodiment, the upper floating electrode 52 is divided into the antenna pattern region and the outside of the antenna pattern region, and the upper floating electrodes 52 in the antenna pattern region are connected to each other.

FIG. 15 is a diagram in which FIGS. 13 and 14 are superimposed, and is a diagram showing the positional relationship between the row direction wiring, the lower floating electrode, the column direction wiring, the upper floating electrode, and the antenna pattern. FIG. 5 is a diagram corresponding to FIG. 5 according to the first embodiment.

Similar to the first embodiment, the overlapping region 100A of the lower floating electrode 42 and the upper floating electrode 52 in the antenna pattern region forms a contact hole in the interlayer insulating film 11, and the lower floating electrode 42 and the upper portion in the antenna pattern region are formed. An antenna pattern is formed by connecting the floating electrodes 52.

<Summary of Embodiment 2>
According to the touch screen according to the second embodiment as described above, it is possible to form an antenna pattern without changing the touch panel pattern, and it is possible to present a good communication environment without increasing the cost. Become. Further, the capacitance can be adjusted by making the floating electrode pattern an isolated pattern instead of a mesh shape.

Embodiment 3
Embodiment 3 of the present disclosure will be described with reference to FIGS. 16 and 17. FIG. 16 is a perspective view of the display device according to the third embodiment, and FIG. 17 is a plan view showing the configuration of the touch screen according to the third embodiment.

In FIG. 16, when the NFC antenna is incorporated in the LCD as disclosed in Patent Document 1, the back surface of the display device or between the reflector of the backlight and the rear frame is used so as not to affect the display. It shows the situation where the antenna 110 is arranged. In this case, since the display element 2 is interposed between the touched portion and the antenna 110, there arises a problem that the magnetic flux is weakened and the communication distance is shortened.

Therefore, as in the first and second embodiments, by providing the antenna pattern 100 inside the touch panel, the effect that the antenna pattern 100 can be used as a resonance antenna with the antenna 110 is obtained. This makes it possible to strengthen the magnetic flux and secure an appropriate communication distance. At this time, since it is not necessary to supply power to the antenna pattern 100, it is not necessary to connect the antenna pattern 100 to the terminal 8 as shown in FIG.

<Summary of Embodiment 3>
According to the touch screen 1 according to the third embodiment as described above, it is possible to form an antenna pattern without changing the touch panel pattern, and the antenna pattern is used as a resonance antenna to strengthen the magnetic flux. It is possible to provide a comfortable communication environment.

1 touch screen, 2 display elements, 3 adhesives,
4 Shielded wiring, 5 Outermost shielded wiring, 8 terminals, 10 transparent board,
11 interlayer insulating film, 12 protective plate, 13 adhesive, 14 transparent substrate,
15 contact holes,
20 lower electrode,
21 line direction wiring, 22 lower floating electrode, 23 dividing part,
30 upper electrode,
31 rows of wiring, 32 upper floating electrodes, 33 breaks,
40 lower electrode,
41 row wiring, 42 lower floating electrode, 43 breaks,
50 upper electrode,
51 row direction wiring, 52 upper floating electrode, 53 dividing part,
100, 101 antenna pattern area, 110 antenna,
R1 to R6, C1 to C6, N1 lead-out wiring

Claims (6)

Row-direction wiring and column-direction wiring formed by being laminated on a transparent substrate via an insulating layer,
A first floating electrode that is in the same layer as the row direction wiring and is not electrically connected to the row direction wiring.
A second floating electrode that is in the same layer as the row direction wiring and is not electrically connected to the row direction wiring.
An antenna pattern formed by connecting a part of the first floating electrode and a part of the second floating electrode, and
Touch screen with. In the first floating electrode,
The region constituting the antenna pattern and
The region that does not form the antenna pattern is
The touch screen according to claim 1, wherein the touch screen is divided at the edge of the antenna pattern. In the second floating electrode,
The region constituting the antenna pattern and
The region that does not form the antenna pattern is
The touch screen according to claim 1 or 2, which is divided at the edge of the antenna pattern. The first floating electrode and the second floating electrode are
The touch screen according to any one of claims 1 to 3, which is connected via a contact hole formed in the insulating film. The touch screen according to any one of claims 1 to 4, further comprising a terminal that is electrically connected to the antenna pattern via the second floating electrode. A display device including the touch screen according to any one of claims 1 to 5.

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