BACKGROUND

1. Field of the Invention

The present invention relates to an antenna laminate and an image display device including the same, and more specifically, to an antenna laminate including an antenna electrode layer and ground layers, and an image display device including the antenna laminate.

2. Description of the Related Art

Recently, according to development of the information-oriented society, wireless communication techniques such as Wi-Fi, Bluetooth, and the like are implemented, for example, in a form of smartphones by combining with image display devices. In this case, an antenna may be coupled to the image display device to perform a communication function.

With the recent development of mobile communication technology, an antenna for performing communication in ultra-high frequency bands (e.g., 3G to 5G) has been applied to various objects such as display devices, vehicles, and buildings.

Meanwhile, electronic devices, in which a touch panel or a touch sensor of an input device for inputting commands of a user by selecting instructions displayed on a screen with a user's finger or an object is combined with the image display device to implement image display and information input functions, are being developed. For example, as disclosed in Korean Patent Laid-Open Publication No. 2014-0092366, a touch screen panel, in which a touch sensor is coupled to various image display devices, has been developed.

By combining the antenna and the touch sensor in one image display device, it may be difficult to secure an appropriate mounting space. Further, electrical characteristics in the antenna, the touch sensor, and the display panel may be disturbed due to a mutual interference between signals.

For example, Korean Patent Laid-Open Publication No. 2003-0095557 discloses an antenna structure embedded in a portable terminal, but the consistency with other electrical elements such as a touch sensor has not been considered.

SUMMARY

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

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

To achieve the above objects, the following technical solutions are adopted in the present invention.

1. An antenna laminate including: 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 below the first ground layer; and a second dielectric layer disposed between the first ground layer and the second ground layer.

2. The antenna laminate according to the above 1, wherein the antenna electrode layer includes a radiation electrode.

3. The antenna laminate according to the above 2, the first ground layer includes a touch sensor electrode.

4. The antenna laminate according to the above 3, wherein the touch sensor electrode comprises a transparent conductive oxide.

5. The antenna laminate according to the above 2, wherein the second ground layer includes a low resistance ground electrode comprising a material having a lower resistance than the first ground layer; and the low resistance ground electrode is overlapped with or fully covered by the radiation electrode of the antenna electrode layer.

6. The antenna laminate according to the above 5, wherein the low resistance ground electrode is fully covered by the radiation electrode.

7. The antenna laminate 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 end of the transmission line.

8. The antenna laminate according to the above 7, further including a ground pad around the signal pad, the ground pad electrically separated from the signal pad and the transmission line.

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

10. The antenna laminate according to the above 1, wherein the second dielectric layer has a thickness of 1 to 500 μm.

11. The antenna laminate according to the above 1, wherein the first dielectric layer has a thickness of 200 μm or more.

12. The antenna laminate according to the above 1, wherein the antenna electrode layer has a mesh structure.

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

14. The antenna laminate according to the above 1, further including 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.

15. An image display device including: the antenna laminate according to the above 1; and a display panel comprising an electrode structure and an encapsulation layer formed on the electrode structure, wherein the electrode structure of the display panel is provided as the second ground layer of the antenna laminate; and the encapsulation layer is the second dielectric layer of the antenna laminate.

16. The antenna laminate according to claim3, wherein the second ground layer comprises a low resistance ground electrode comprising a material having a lower resistance than the touch sensor electrode.

17. The antenna laminate according to claim16, wherein the low resistance ground electrode is overlapped with or fully covered by the radiation electrode of the antenna electrode layer.

18. An image display device comprising: a first ground layer; a first dielectric layer disposed on the first ground layer; an antenna electrode layer disposed on the first dielectric layer; and a display panel comprising: an electrode structure comprising a second ground layer disposed below the first ground layer; and an encapsulation layer comprising a second dielectric layer disposed between the first ground layer and the second ground layer.

In the antenna laminate according to embodiments of the present invention, the antenna electrode layer, the first ground layer, and the second ground layer may be respectively disposed with the first dielectric layer and the second dielectric layer interposed therebetween. The second ground layer may form a ground composite together with the first ground layer, thus to improve signal characteristics of the antenna (antenna gain and efficiency).

According to exemplary embodiments, the first ground layer may include a touch sensor electrode. In this case, the antenna laminate may simultaneously perform functions of the antenna and the touch sensor. Thereby, space utilization may be improved and needs for decreasing a thickness of the antenna may be achieved.

According to exemplary embodiments, the touch sensor electrode may include a transparent conductive oxide. Therefore, visibility of an image may be improved when laminating the antenna laminate on the image display device.

According to exemplary embodiments, the second ground layer may include 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. Thereby, the signal characteristics of the antenna may be improved.

According to exemplary embodiments, the antenna electrode layer may have a mesh structure. Thereby, when disposing the antenna laminate on the display panel, a deterioration in visibility of an image may be prevented.

