KR20200112755A - Antenna laminate and image display device including the same - Google Patents

Abstract

Embodiments of the present invention provide an antenna laminate, in which a first dielectric layer and an antenna electrode layer are disposed on a first ground layer and a second dielectric layer and a second ground layer are disposed under the first ground layer. The first ground layer and the second ground layer may form a ground composite to improve signal characteristics of an antenna.

Description

An antenna stack and an image display device including the same TECHNICAL FIELD

The present invention relates to an antenna stack and an image display device including the same. More particularly, it relates to an antenna stack including an antenna electrode layer and a ground layer, and an image display device including the same.

With the recent development of the information society, wireless communication technologies such as Wi-Fi and Bluetooth are combined with an image display device and implemented in the form of, for example, a smartphone. In this case, an antenna may be coupled to the image display device to perform a communication function.

With the recent evolution of mobile communication technology, an antenna for performing communication in an ultra-high frequency band corresponding to, for example, 3G to 5G needs to be coupled to the image display device.

On the other hand, a touch panel or a touch sensor, which is an input device that allows the user's command to be input by selecting the instruction content displayed on the screen with a person's hand or object, is combined with the image display device to implement an image display function and information input function together Electronic devices are being developed. For example, as in Korean Patent Publication No. 2014-0092366, a touch screen panel in which a touch sensor is combined with various image display devices has been developed.

As the antenna and the touch sensor are combined in one image display device, it may be difficult to secure an appropriate mounting space, and electrical characteristics of the antenna, the touch sensor, and the display panel may be disturbed by mutual signal interference.

For example, Korean Patent Application Publication No. 2003-0095557 discloses an antenna structure embedded in a portable terminal, but does not consider the compatibility with other electric devices such as a touch sensor.

Korean Patent Application Publication No. 2014-0092366 Korean Patent Application Publication No. 2003-0095557

An object of the present invention is to provide an antenna stack having improved structural efficiency and signal efficiency.

An object of the present invention is to provide an image display device having improved structural efficiency and operational reliability.

1. a first ground layer; A first dielectric layer disposed on the first ground layer; An antenna electrode layer disposed on the first dielectric layer; A second ground layer disposed under the first ground layer; And a second dielectric layer disposed between the first ground layer and the second ground layer.

2. The antenna stack according to the above 1, wherein the antenna electrode layer includes a radiation electrode, and the first ground layer includes a touch sensor electrode.

3. In the above 2, the touch sensor electrode comprises a transparent conductive oxide, the antenna laminate.

4. The antenna stack according to 2 above, wherein the second ground layer includes a low resistance ground electrode, and the low resistance ground electrode at least partially overlaps the radiation electrode of the antenna electrode layer.

5. The antenna stack according to the above 2, wherein the low-resistance ground electrode is entirely overlapped with the radiation electrode.

6. The antenna stack according to the above 2, wherein the antenna electrode layer further includes a transmission line branched from the radiation electrode and a signal pad connected to one end of the transmission line.

7. The antenna stack according to the above 6, further comprising a ground pad electrically separated from the signal pad and the transmission line around the signal pad.

8. The antenna stack according to the above 1, wherein the second ground layer includes a metal having a lower resistance than the first ground layer.

9. In the above 1, the thickness of the second dielectric layer is 1 to 500㎛, the antenna laminate.

10. The antenna stack according to the above 1, wherein the thickness of the first dielectric layer is 200 μm or more.

11. The antenna stack according to the above 1, wherein the antenna electrode layer includes a mesh structure.

12. The antenna stack according to the above 1, wherein the first dielectric layer includes an adhesive layer.

13. The antenna stack according to the above 1, further comprising a first adhesive layer disposed between the antenna electrode layer and the first dielectric layer, and a second adhesive layer disposed between the first dielectric layer and the first ground layer sieve.

14. Any one of the above 1 to 13 antenna stack; And a display panel including an electrode structure and an encapsulation layer formed on the electrode structure, wherein the electrode structure is provided as the second ground layer of the antenna stack, and the encapsulation layer is the second An image display device provided as a dielectric layer.

In the antenna stack according to embodiments of the present invention, the antenna electrode layer, the first ground layer, and the second ground layer may be disposed with the first dielectric layer and the second dielectric layer interposed therebetween. The second ground layer forms a ground complex together with the first ground layer, thereby improving signal characteristics (antenna gain and efficiency) of the antenna.

According to example embodiments, the first ground layer may include a touch sensor electrode. In this case, the antenna stack can simultaneously perform the functions of the antenna and the touch sensor. Therefore, it is possible to improve the space utilization and achieve the thin film requirements.

According to example embodiments, the touch sensor electrode may include a transparent conductive oxide. Accordingly, when the antenna stack is stacked on the image display device, the visibility of the image can be improved.

According to example embodiments, the second ground layer may include a metal having a lower resistance than the first ground layer. In this case, the second ground layer may supplement and improve the performance of the first ground layer as a ground layer. Therefore, the signal characteristics of the antenna can be improved.

According to exemplary embodiments, the antenna electrode layer may include a mesh structure. Therefore, when the antenna stack is disposed on the display panel, it is possible to prevent deterioration in visibility of the image.

1 is a schematic cross-sectional view illustrating an antenna stack according to exemplary embodiments.
2 and 3 are schematic plan and cross-sectional views illustrating touch sensor electrodes according to some embodiments.
4 and 5 are schematic plan views illustrating an antenna electrode layer according to some embodiments.
6 is a schematic plan view illustrating an antenna stack according to exemplary embodiments.
7 is a schematic cross-sectional view illustrating an image display device according to exemplary embodiments.

Embodiments of the present invention provide an antenna stack in which a first dielectric layer and an antenna electrode layer are disposed on a first ground layer, and a second dielectric layer and a second ground layer are disposed under the first ground layer, and an image display device including the same. to provide. The first ground layer and the second ground layer may form a ground composite to improve signal characteristics of the antenna.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. However, the following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention together with the contents of the present invention, so the present invention is described in such drawings. It is limited to matters and should not be interpreted.

1 is a schematic cross-sectional view illustrating an antenna stack according to exemplary embodiments.

Referring to FIG. 1, the antenna stack may include a first ground layer 200, a first dielectric layer 290, an antenna electrode layer 300, a second dielectric layer 190, and a second ground layer 100. .

The first ground layer 200 may be coupled with the antenna electrode layer 300 with the first dielectric layer 290 interposed therebetween to form a capacitance or inductance. In this case, the vertical radiation characteristic can be implemented.

The first ground layer 200 may include, for example, a metal, a metal alloy, or a metal oxide having a predetermined conductivity.

The first dielectric layer 290 may be disposed on the first ground layer 200. For example, the first dielectric layer 290 may contact the first ground layer 200, or another member may be interposed between the first dielectric layer 290 and the first ground layer 200.

The first dielectric layer 290 may include, for example, a transparent resin material. For example, the first dielectric layer 290 may include polyester resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polybutylene terephthalate; Cellulose resins such as diacetyl cellulose and triacetyl cellulose; Polycarbonate resin; Acrylic resins such as polymethyl (meth)acrylate and polyethyl (meth)acrylate; Styrene resins such as polystyrene and acrylonitrile-styrene copolymer; Polyolefin resins such as polyethylene, polypropylene, polyolefin having a cyclo-based or norbornene structure, and ethylene-propylene copolymer; Vinyl chloride resin; Amide resins such as nylon and aromatic polyamide; Imide resin; Polyethersulfone resin; Sulfone resin; Polyether ether ketone resin; Sulfide polyphenylene resin; Vinyl alcohol resin; Vinylidene chloride resin; Vinyl butyral resin; Allylate resin; Polyoxymethylene resin; It may contain a thermoplastic resin such as an epoxy resin. These may be used alone or in combination of two or more.

In addition, a transparent film made of a thermosetting resin such as (meth)acrylic, urethane, acrylic urethane, epoxy, silicone, or an ultraviolet curable resin may be used as the first dielectric layer 290.

In some embodiments, an adhesive layer such as an optically clear adhesive (OCA) or an optically clear resin (OCR) may be included in the first dielectric layer 290.

In some embodiments, the first dielectric layer 290 may include an inorganic insulating material such as silicon oxide, silicon nitride, silicon oxynitride, glass, or the like.

In one embodiment, the first dielectric layer 290 may be provided as a substantially single layer. In an embodiment, the first dielectric layer 290 may include at least two or more layers of a multilayer structure.

Capacitance or inductance is formed between the antenna electrode layer 300 and/or the first ground layer 200 by the first dielectric layer 290, and the frequency at which the antenna structure can be driven or sensed The band can be adjusted. In some embodiments, the dielectric constant of the first dielectric layer 290 may be adjusted in the range of about 2 to 12. When the dielectric constant exceeds about 12, the driving frequency is excessively reduced, so that driving in a desired high frequency band may not be implemented.

In example embodiments, the thickness of the first dielectric layer 290 may be 200 μm or more. When the thickness of the first dielectric layer 290 is less than 200 μm, the distance between the antenna electrode layer 300 and the first ground layer 200 may be excessively close. In this case, the gain and efficiency of the antenna may decrease. Preferably, the thickness of the first dielectric layer 290 may be 300 μm or more. In this case, the gain and efficiency of the antenna can be improved to 5dB or more and 60% or more, respectively. More preferably, the thickness of the first dielectric layer 290 may be 400 μm or more.

The antenna electrode layer 300 may be disposed on the first dielectric layer 290. For example, the antenna electrode layer 300 may contact the first dielectric layer 290, or another member may be interposed between the antenna electrode layer 300 and the first dielectric layer 290.

4 is a schematic plan view illustrating an antenna electrode layer according to some embodiments.

Referring to FIG. 4, the antenna electrode layer 300 may include a radiation electrode 312, a transmission line 320, and a pad 330. The pad 330 may include a signal pad 332 and a ground pad 334.

The radiation electrode 312 may have, for example, a polygonal plate shape, and the transmission line 320 may extend from the central portion of the radiation electrode 312 to be electrically connected to the signal pad 332. The transmission line 320 may be formed as a single member substantially integral with the radiation electrode 312.

In some embodiments, a pair of ground pads 334 may be disposed with the signal pad 332 interposed therebetween. The ground pads 334 may be electrically separated from the signal pad 332 and the transmission line 320.

The antenna electrode layer 300 may overlap the first ground layer 200 in the thickness direction of the antenna stack. For example, the radiation electrode 312 of the antenna electrode layer 300 may at least partially overlap the electrode structure included in the first ground layer 200.

The antenna electrode layer 300 is silver (Ag), gold (Au), copper (Cu), aluminum (Al), platinum (Pt), palladium (Pd), chromium (Cr), titanium (Ti), tungsten (W). , Niobium (Nb), Tantalum (Ta), Vanadium (V), Iron (Fe), Manganese (Mn), Cobalt (Co), Nickel (Ni), Zinc (Zn), Tin (Sn), Molybdenum (Mo) Or it may include an alloy thereof. These may be used alone or in combination of two or more. For example, silver (Ag) or a silver alloy (for example, silver-palladium-copper (APC) alloy) may be used to implement low resistance.

In some embodiments, the antenna electrode layer may include a transparent metal oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (ITZO), and zinc oxide (ZnOx).

5 is a schematic plan view illustrating an antenna electrode layer according to some embodiments.

Referring to FIG. 5, the radiation electrode 312 may include a mesh structure. In this case, the transmittance of the radiation electrode 312 is improved, and when the antenna structure is mounted on a display device, the radiation electrode 312 may be suppressed from being visually recognized by a user. In one embodiment, the transmission line 320 may also include a mesh structure by being patterned together with the radiation electrode 312.

In some embodiments, a dummy pattern 345 having a mesh structure may be formed around the radiation electrode 312. In one embodiment, the radiation electrode 312 may also include a mesh structure that is substantially the same as or similar to the dummy pattern 345.

For example, the radiation electrode 312 and the dummy pattern 345 may be separated and insulated from each other by the separation region 340 formed along the edge of the radiation electrode 312.

By forming the radiation electrode 312 and the dummy pattern 345 to have substantially the same or similar mesh structure, the transmittance of the antenna electrode layer 300 is improved and the visibility of the radiation electrode 312 due to the difference in pattern shape is prevented. can do.

In some embodiments, the transmission line 320 branching from the radiation electrode 312 may also include a mesh structure. In one embodiment, the pad 330 illustrated in FIG. 4 may have a solid pattern structure to improve signal speed and reduce resistance.

In example embodiments, the first ground layer 200 may include a touch sensor electrode.

2 and 3 are schematic plan and cross-sectional views illustrating the touch sensor electrode according to some embodiments. For example, FIG. 3 is a cross-sectional view taken along line II′ of FIG. 2.

2 and 3, the touch sensor electrode may include sensing electrodes arranged on the support layer 210.

The support layer 210 is, for example, a cyclic olefin polymer (COP), polyethylene terephthalate (PET), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyphenylene sulfide (PPS). ), polyallylate, polyimide (PI), cellulose acetate propionate (CAP), polyethersulfone (PES), cellulose triacetate (TAC), polycarbonate (PC), cyclic olefin copolymer (COC) ), polymethyl methacrylate (PMMA), and the like.

In some embodiments, the support layer 210 may include an inorganic insulating material such as silicon oxide, silicon nitride, silicon oxynitride, glass, or the like.

In example embodiments, the second dielectric layer 190 may be provided as the support layer 210.

The sensing electrodes may include sensing electrodes arranged in different directions on a plane. The sensing electrodes may include first sensing electrodes 220 and second sensing electrodes 230 arranged to cross each other.

The first sensing electrodes 220 may be arranged along a row direction (eg, an X direction), for example. The second sensing electrodes 230 may be arranged along a column direction (eg, a Y direction), for example.

The first sensing electrode 220 and the second sensing electrode 230 may each provide information on the X coordinate and Y coordinate of the touched point. For example, when a human hand or object is input onto the touch sensor stack, an electrical signal may be generated by a change in capacitance through the first sensing electrode 220 and the second sensing electrode 230. The electrical signal may be transmitted to the driving circuit through, for example, a position detection line.

Each of the second sensing electrodes 230 may have a spaced island shape. Meanwhile, the first sensing electrodes 220 may be integrally connected to each other through the connection part 225 along the row direction (eg, the X direction).

When the first sensing electrode 220 and the second sensing electrode 230 are disposed on the same level, the second sensing electrode 230 is insulated from the first sensing electrode 220 and a bridge is connected to each other. An electrode 235 may be further formed. The bridge electrode 235 may electrically connect the second sensing electrodes 230 adjacent to each other in a column direction (eg, y direction) to each other.

As shown in FIG. 3, the insulating layer 240 may at least partially cover the sensing electrodes 220 and 230. In some embodiments, the insulating layer 240 may cover the first sensing electrode 220 or the connection portion 225 and may partially cover the second sensing electrodes 230. For example, the insulating layer 240 may include a contact hole partially exposing the upper surface of the second sensing electrode 230.

The insulating layer 240 may be formed of a transparent insulating material. For example, the insulating layer 240 may be formed using an inorganic insulating material such as silicon oxide or a transparent organic material such as an acrylic resin.

The bridge electrode 235 may be disposed on the insulating layer 240 to electrically connect a pair of adjacent second sensing electrodes 230 to each other. For example, the bridge electrode 235 may cross each other with the connection part 225 on the insulating layer 240. The bridge electrode 235 may fill the contact holes formed in the insulating layer 240.

The sensing electrodes 220 and 230 and the bridge electrode 235 may include a transparent conductive oxide or metal. The transparent conductive oxide may include, for example, indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium zinc tin oxide (IZTO), cadmium tin oxide (CTO), and the like. The metal is, for example, silver (Ag), gold (Au), copper (Cu), aluminum (Al), platinum (Pt), palladium (Pd), chromium (Cr), titanium (Ti), tungsten (W ), niobium (Nb), tantalum (Ta), vanadium (V), iron (Fe), manganese (Mn), cobalt (Co), nickel (Ni), zinc (Zn), tin (Sn), molybdenum (Mo ) Or an alloy thereof.

Preferably, the touch sensor electrode may be formed of a transparent conductive oxide. In this case, when the antenna stack is stacked on the display device, it is possible to effectively suppress a decrease in image visibility.

In some embodiments, the sensing electrodes 220 and 230 and/or the bridge electrode 235 may have a multilayer structure. For example, the sensing electrodes 220 and 230 and/or the bridge electrode 235 may have a structure in which a transparent oxide layer and a metal layer are stacked.

In some embodiments, the first sensing electrode 220 and the second sensing electrode 230 may be formed at different levels. For example, one of the first sensing electrode 220 and the second sensing electrode 230 may be formed on the insulating layer 240 and the other under the insulating layer 240. In this case, the bridge electrode 235 may be omitted, and both the first sensing electrode 220 and the second sensing electrode 230 may include a connection part.

In some embodiments, each of the sensing electrodes may be formed in an independent island pattern and may be provided as individual sensing domains.

In example embodiments, the touch sensor electrode may be covered with a passivation layer 250. The passivation layer 250 may include an inorganic insulating material, an organic insulating material, or an organic-inorganic hybrid film. The passivation layer 250 may be provided as a sealing layer protecting the touch sensor electrode.

In example embodiments, the touch sensor electrode may at least partially overlap the radiation electrode 312 in a vertical direction or a height (thickness) direction of the antenna stack. Accordingly, the touch sensor electrode may be provided as a ground of the antenna electrode layer 300. For example, the radiation electrode 312 and the touch sensor electrode are coupled to each other to transmit and receive antenna signals. In some embodiments, the radiation electrode 312 may entirely overlap the touch sensor electrode. In this case, a coupling area between the radiation electrode 312 and the touch sensor electrode may increase, and gain and efficiency of the antenna may increase.

The second ground layer 100 may be disposed under the first ground layer 200. The second ground layer 100 may form a ground composite with the first ground layer 200. The ground composite may act as one ground layer to improve performance (grounding performance) of the ground layer.

For example, when the grounding performance of the first ground layer 200 is insufficient (for example, if the resistance of the ground layer is high, the radiation efficiency decreases due to electrical loss), the second ground layer 100 By supplementing and increasing it, the grounding performance of the entire ground composite may be improved.

The second ground layer 100 may include, for example, a metal, a metal alloy, or a metal oxide having a predetermined conductivity.

For example, when the first ground layer 200 and the touch sensor electrode include a transparent conductive oxide, the resistance (sheet resistance) of the transparent conductive oxide may be greater than that of a metal or a metal alloy. Accordingly, the grounding performance of the first ground layer 200 is reduced, so that gain and efficiency of the antenna may be reduced.

According to exemplary embodiments, the second ground layer 100 is disposed under the first ground layer 200 so that the second ground layer 100 and the first ground layer 200 form the ground composite. I can. Accordingly, the second ground layer 100 may compensate for the insufficient grounding performance of the first ground layer 200. In this case, the grounding performance of the entire ground composite coupled to the antenna electrode layer 300 may be improved. Accordingly, by using a transparent conductive oxide as the first ground layer 200, it is possible to improve the visibility of an image while improving the gain and efficiency of the antenna.

In example embodiments, the second ground layer 100 may include a metal having a lower resistance than the first ground layer 200. Accordingly, when forming the ground composite, it is possible to effectively improve the grounding performance of the first ground layer 200.

In example embodiments, the second ground layer 100 may include a low resistance ground electrode. The low resistance ground electrode may be formed of a material having a lower resistance than the touch sensor electrode. The low resistance ground electrode may include, for example, an electrode structure of a display panel. The electrode structure may include a gate electrode, a source electrode, a drain electrode, and/or a pixel electrode of the display panel.

In example embodiments, the low-resistance ground electrode may at least partially overlap the radiation electrode 312 in a vertical direction or a height (thickness) direction of the antenna stack. Accordingly, the low-resistance ground electrode may be provided as a ground of the antenna electrode layer 300. For example, the radiation electrode 312 and the low resistance ground electrode are coupled to each other to transmit and receive antenna signals. Grounding performance resulting from the second ground layer 100 may be improved by the overlapping structure.

In some embodiments, the radiation electrode 312 may entirely overlap the low-resistance ground electrode. In this case, a coupling area between the radiation electrode 312 and the low-resistance ground electrode may increase, and gain and efficiency of the antenna may increase.

The second dielectric layer 190 may be disposed between the first ground layer 200 and the second ground layer 100. For example, the second dielectric layer 190 may contact the first ground layer 200 and the second ground layer 100, or the second dielectric layer 190 and the first ground layer 200 and the second ground layer ( Another member may be interposed between 100).

The second dielectric layer 190 may include, for example, a transparent resin material. For example, the second dielectric layer 190 may include polyester resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polybutylene terephthalate; Cellulose resins such as diacetyl cellulose and triacetyl cellulose; Polycarbonate resin; Acrylic resins such as polymethyl (meth)acrylate and polyethyl (meth)acrylate; Styrene resins such as polystyrene and acrylonitrile-styrene copolymer; Polyolefin resins such as polyethylene, polypropylene, polyolefin having a cyclo-based or norbornene structure, and ethylene-propylene copolymer; Vinyl chloride resin; Amide resins such as nylon and aromatic polyamide; Imide resin; Polyethersulfone resin; Sulfone resin; Polyether ether ketone resin; Sulfide polyphenylene resin; Vinyl alcohol resin; Vinylidene chloride resin; Vinyl butyral resin; Allylate resin; Polyoxymethylene resin; It may contain a thermoplastic resin such as an epoxy resin. These may be used alone or in combination of two or more.

In addition, a transparent film made of a thermosetting resin such as (meth)acrylic-based, urethane-based, acrylic-urethane-based, epoxy-based, silicone-based or ultraviolet-curable resin may be used as the second dielectric layer 190. In some embodiments, an adhesive film such as an optically clear adhesive (OCA), an optically clear resin (OCR), or the like may be included in the second dielectric layer 190.

In some embodiments, the second dielectric layer 190 may include an inorganic insulating material such as silicon oxide, silicon nitride, silicon oxynitride, glass, or the like.

In one embodiment, the second dielectric layer 190 may be provided as a substantially single layer. In an embodiment, the second dielectric layer 190 may include at least two or more layers of a multilayer structure.

Capacitance or inductance is formed between the first ground layer 200 and/or the second ground layer 100 by the second dielectric layer 190, so that the ground composite may be formed. A frequency band in which the antenna stack can be driven or sensed may be adjusted by the second dielectric layer 190. In some embodiments, the dielectric constant of the second dielectric layer 190 may be adjusted in the range of about 2 to 12. When the dielectric constant exceeds about 12, the driving frequency is excessively reduced, so that driving in a desired high frequency band may not be implemented.

In example embodiments, the thickness of the second dielectric layer 190 may be 1 to 500 μm. When the thickness of the second dielectric layer 190 is more than 500 μm, the effect of improving the grounding performance due to the formation of the ground composite may not be substantially realized. Preferably, the thickness of the second dielectric layer 190 may be 1 to 400 μm, more preferably 1 to 150 μm.

6 is a schematic plan view illustrating an antenna stack according to exemplary embodiments. Description of the configuration substantially the same as the configuration described with reference to FIG. 1 may be omitted.

Referring to FIG. 6, a first adhesive layer 295 is disposed between the antenna electrode layer 300 and the first dielectric layer 290, and a second point is disposed between the first dielectric layer 290 and the first ground layer 200. An adhesive layer 285 may be disposed.

The first adhesive layer 295 and the second adhesive layer 285 may include an adhesive film such as an optically clear adhesive (OCA) or an optically clear resin (OCR).

In example embodiments, the antenna electrode layer 300 and the first ground layer 200 may be electrically and physically separated by the first dielectric layer 290. In addition, they may be connected to each other by a via or a contact penetrating the first dielectric layer 290.

In example embodiments, the first ground layer 200 and the second ground layer 100 may be electrically and physically separated by the second dielectric layer 190. In addition, they may be connected to each other by a via or a contact passing through the second dielectric layer 190.

7 is a schematic cross-sectional view illustrating an image display device according to exemplary embodiments.

Referring to FIG. 7, the image display device may include an antenna electrode layer 300, a first dielectric layer 290, and a display panel 400.

The display panel 400 includes, for example, a TFT array substrate or a back-plane substrate of a display device such as an organic light emitting diode (OLED) display device or a liquid crystal display (LCD). can do.

The display panel 400 may include an electrode structure 410 and an encapsulation layer 420.

The electrode structure 410 may include a gate electrode, a source electrode, and a drain electrode included in the thin film transistor (TFT) array of the display panel 400. Further, the electrode structure 410 may include a pixel electrode of the display panel 400.

For example, the gate electrode, the source electrode, the drain electrode, and the pixel electrode are silver (Ag), gold (Au), copper (Cu), molybdenum (Mo), aluminum (Al), platinum (Pt), palladium (Pd), respectively. ), chromium (Cr), titanium (Ti), tungsten (W), niobium (Nb), tantalum (Ta), vanadium (V), iron (Fe), manganese (Mn), cobalt (Co), nickel (Ni ), zinc (Zn), tin (Sn), molybdenum (Mo), or a low resistance metal such as an alloy thereof.

The encapsulation layer 420 may include an inorganic insulating material, an organic insulating material, or an organic-inorganic hybrid film. The encapsulation layer 420 may be provided as a sealing layer that protects the thin film transistor TFT, the electrode, and the display layer included in the display panel 400. In an embodiment, the encapsulation layer 420 may be manufactured together as a component or member included in the display panel 400.

In example embodiments, the electrode structure 410 may be provided as the second ground layer 100. In addition, the encapsulation layer 420 may be provided as the second dielectric layer 190. In this case, by disposing the display panel 400 under the first ground layer 200 without additionally forming a second dielectric layer and a second ground layer, the antenna stack having the ground composite may be implemented. . Accordingly, a thin image display device including a touch sensor and an antenna function can be simply formed, and operation interference of the image display device due to a separate ground layer can be prevented.

Hereinafter, preferred embodiments are presented to aid the understanding of the present invention, but these examples are only illustrative of the present invention and do not limit the scope of the appended claims, and examples within the scope and spirit of the present invention It is obvious to those skilled in the art that various changes and modifications are possible, and it is natural that such modifications and modifications fall within the scope of the appended claims.

Examples 1 to 8

An antenna electrode layer was formed on the upper surface of the polyimide dielectric layer using a silver-palladium-copper (APC) alloy.

A touch electrode layer including sensing electrodes formed of indium tin oxide (ITO) having a thickness of 3 to 4 μm was bonded under the dielectric layer.

The distance between the antenna electrode layer and the touch electrode layer was adjusted to 400 μm.

An image display device was manufactured by bonding the bottom of the touch electrode layer with an OLED panel.

The distance between the touch electrode layer and the electrode structure (TFT electrode and pixel electrode) of the OLED panel was adjusted as shown in Table 1 below.

Comparative example

An antenna electrode layer was formed on the upper surface of the polyimide dielectric layer using a silver-palladium-copper (APC) alloy.

A touch electrode layer including sensing electrodes formed of indium tin oxide (ITO) having a thickness of 3 to 4 μm was bonded under the dielectric layer.

The antenna laminate of Comparative Example was manufactured by adjusting the distance between the antenna electrode layer and the touch electrode layer to 400 μm.

Experimental Example-Evaluation of signal characteristics of antenna

For the image display devices and antenna stacks of Examples and Comparative Examples, the S-parameter (S11, return loss) and antenna efficiency were extracted at a frequency of about 27.5 to 28.5 GHz with an impedance of 50 Ω using a network analyzer and shown in Table 1 below. Done.

Distance between the touch electrode layer and the OLED electrode structure (㎛) S11(dB) efficiency(%) Example 1 10 -9.08 87.1 Example 2 25 -9.10 87.2 Example 3 50 -9.47 88.7 Example 4 100 -7.82 83.5 Example 5 150 -7.02 80.2 Example 6 240 -4.53 64.8 Example 7 380 -4.01 60.3 Example 8 480 -3.41 54.4 Comparative example No OLED -3.40 53.3

Referring to Table 1, the antenna performance of the examples was improved compared to the comparative example in which the OLED was not used as the second ground layer.

Reference example

An antenna electrode layer formed of APC was disposed on the polyimide dielectric layer, and an APC ground layer having a thickness of 2400 Å was formed under the dielectric layer. The resistance of the APC ground layer was 0.15Ω.

While adjusting the thickness of the dielectric layer as shown in Table 2 below, antenna characteristics were evaluated in the same manner as in the experimental example.

Dielectric layer thickness (㎛) Radiation efficiency (%) Gain (dBi) Directivity(dBi) Reference Example 1 10 0.13 -28.23 7.72 Reference Example 2 50 0.45 -15.48 8.04 Reference Example 3 100 18 0.14 7.54 Reference Example 4 200 43.7 3.2 7.32 Reference Example 5 300 64.3 5.35 7.27 Reference Example 6 400 78.0 5.6 7.18 Reference Example 7 500 80.3 6.18 7.14 Reference Example 8 700 85 6.35 7.07 Reference Example 9 1000 87.8 6.15 6.8

Referring to Table 2, as the thickness of the dielectric layer increases, the efficiency and gain of the antenna increase. When the thickness of the dielectric layer is 200㎛ or more, the efficiency and gain were found to be at the level usable as an antenna. Excellent efficiency and gain were observed when the thickness of the dielectric layer was 300 μm or more, and the efficiency and gain were substantially saturated in the section where the thickness of the dielectric layer was 400 μm or more.

100: second ground layer 190: second dielectric layer
200: first ground layer
210: support layer 220: first sensing electrode
225: connection part 230: second sensing electrode
235: bridge electrode 240: insulating layer
250: passivation layer 285: second adhesive layer
290: first dielectric layer 295: first adhesive layer
300: antenna electrode layer
312: radiation electrode 320: transmission line
330: pad 332: signal pad
334: ground pad 340: separation area
345: dummy pattern
400: display panel
410: electrode structure 420: encapsulation layer

Claims (1)

A first ground layer;
A first dielectric layer disposed on the first ground layer;
An antenna electrode layer disposed on the first dielectric layer;
A second ground layer disposed under the first ground layer; And
An antenna stack comprising a second dielectric layer disposed between the first ground layer and the second ground layer.

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