CN215418586U

CN215418586U - Antenna device and display device

Info

Publication number: CN215418586U
Application number: CN202121324964.3U
Authority: CN
Inventors: 金瀯宙; 朴喜俊; 李元熙
Original assignee: Dongwoo Fine Chem Co Ltd
Current assignee: Dongwoo Fine Chem Co Ltd
Priority date: 2020-06-15
Filing date: 2021-06-15
Publication date: 2022-01-04
Anticipated expiration: 2031-06-15
Also published as: WO2021256774A1; CN113809527A; KR20210155210A

Abstract

An antenna device and a display device are provided. The antenna device includes a power feeding line, a dielectric interlayer provided on the power feeding line, and an antenna sheet detachably combined with the dielectric interlayer. The antenna sheet includes a protective sheet and a radiation pattern formed on a surface of the protective sheet. An antenna having a locally applicable frequency may be combined with a display device using an antenna sheet.

Description

Antenna device and display device

Cross Reference to Related Applications

This application claims priority from korean patent application No. 10-2020-.

Technical Field

The present invention relates to an antenna device and a display device. More particularly, the present invention relates to an antenna device including an electrode and a dielectric layer and a display device including the antenna device.

Background

With the development of information technology, wireless communication technologies such as Wi-Fi, bluetooth, etc. are combined with display devices such as in the form of smart phones. In this case, the antenna may be combined with the display device to provide a communication function.

In addition, as high frequency and ultra high frequency mobile communication functions are applied to display devices, an antenna capable of realizing high frequency or ultra high frequency radiation characteristics is required in the display devices.

However, even in high frequency and ultra high frequency mobile communications, different countries may use different frequency bands. Further, the display device equipped with the antenna becomes thinner while having a relatively large display area. Therefore, it may not be possible to include antennas corresponding to different frequency bands of different countries in one display device.

When the antenna is inserted into the display device, radiation characteristics of the antenna may be shielded by various electrodes and wirings of the display device. Therefore, sufficient gain and broadband characteristics may not be achieved using high or ultra-high frequency antennas, which may be susceptible to signal loss.

For example, korean patent laid-open application No. 2003-0095557 discloses an antenna structure embedded in a portable terminal, but the antenna structure disclosed therein cannot sufficiently satisfy the above-mentioned recent requirements.

SUMMERY OF THE UTILITY MODEL

According to an aspect of the present invention, there is provided an antenna device having improved radiation coverage and gain characteristics.

According to an aspect of the present invention, there is provided a display device including an antenna device having improved radiation coverage and gain characteristics.

(1) An antenna device, comprising: a feed line; a dielectric interlayer disposed on the feeder line; and an antenna sheet detachably combined with the dielectric interlayer, the antenna sheet including a protective sheet and a radiation pattern formed on a surface of the protective sheet.

(2) The antenna device according to the above (1), wherein the radiation pattern overlaps with one end portion of the power feeding line in the thickness direction.

(3) The antenna device according to the above (2), wherein the radiation pattern is physically separated from the power feeding line with a dielectric interlayer interposed therebetween.

(4) The antenna device according to the above (2), further comprising a via structure that penetrates the dielectric interlayer and connects one end portion of the feed line and the radiation pattern to each other.

(5) The antenna device according to the above (2), further comprising a via structure connected to one end portion of the feed line and partially penetrating the dielectric interlayer.

(6) The antenna device according to the above (5), wherein the via structure is physically separated from the radiation pattern.

(7) The antenna device according to the above (6), wherein the dielectric interlayer includes a first dielectric interlayer and a second dielectric interlayer stacked in this order from the feed line, and the via structure is formed in the first dielectric interlayer and does not extend into the second dielectric interlayer.

(8) The antenna device according to the above (7), wherein the first dielectric interlayer includes an adhesive layer, and the second dielectric interlayer includes a window sheet.

(9) The antenna device according to the above (1), further comprising a base dielectric layer on which the power feed line is formed.

(10) The antenna device according to the above (9), further comprising an internal antenna element provided on the base dielectric layer.

(11) The antenna device according to the above (10), wherein the internal antenna element includes an internal radiation pattern and a transmission line extending from the internal radiation pattern.

(12) The antenna device according to the above (11), wherein the internal antenna element and the feed line are separated from each other at the same level or the same layer.

(13) The antenna device according to the above (1), wherein the antenna sheet further includes an alignment pattern formed around the radiation pattern on the protective sheet.

(14) A display device, comprising: a display panel; and the antenna device according to the above embodiment stacked on the display panel.

(15) The display device according to the above (14), wherein the dielectric interlayer comprises a window sheet, and the antenna sheet is attached to the window sheet.

The antenna device according to an embodiment of the present invention may include an antenna sheet including a radiation pattern formed on a detachable protective sheet. The antenna sheet may be attached on the dielectric interlayer to overlap the power feeding line with the dielectric interlayer interposed therebetween.

Therefore, even when the frequency environment of each region (or each country) changes, the antenna sheet including the radiation pattern suitable for the frequency environment can be easily replaced.

For example, the antenna sheet may be detachably attached to a window surface of a display device such as a smart phone. Accordingly, radiation interference caused by a conductive structure included in the display device can be reduced, and a multiband or broadband communication function can be easily applied to the display device.

Drawings

Fig. 1 and 2 are a schematic cross-sectional view and a schematic top plan view, respectively, illustrating an antenna device according to an exemplary embodiment.

Fig. 3 and 4 are schematic cross-sectional views illustrating antenna devices according to some exemplary embodiments.

Fig. 5 is a schematic top plan view illustrating an antenna apparatus according to some example embodiments.

Fig. 6 and 7 are a schematic cross-sectional view and a schematic top plan view, respectively, illustrating a display device according to an exemplary embodiment.

Detailed Description

According to an exemplary embodiment of the present invention, there is provided an antenna device including a detachable antenna sheet. According to an exemplary embodiment of the present invention, there is also provided a display device including the antenna device and capable of providing a broadband communication function. The application of the antenna device is not limited to the display device, and the antenna device may be applied to various objects or structures, such as vehicles, home appliances, buildings, and the like.

The antenna device may be, for example, a microstrip patch antenna made in the form of a transparent film. The antenna device can be applied to, for example, a communication device for high-band or ultra-high-band mobile communication corresponding to 3G, 4G, 5G, or higher mobile communication. For example, the antenna device may be driven in a high or ultra high frequency band of about 1GHz or higher, and in one embodiment about 20GHz to 60 GHz. The antenna device may also operate in a frequency band of, for example, 1GHz or lower.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. However, those skilled in the art will appreciate that the embodiments described with reference to the drawings are provided for further understanding of the spirit of the utility model and are not meant to limit the claimed subject matter disclosed in the detailed description and the appended claims.

Fig. 1 and 2 are a schematic cross-sectional view and a schematic top plan view, respectively, illustrating an antenna device according to an exemplary embodiment. Specifically, fig. 2 is a top plan view showing the antenna sheet 150 of the antenna device.

Referring to fig. 1 and 2, the antenna device may include a detachable antenna sheet 150 including a protective sheet 140 and a radiation pattern 130.

The protective sheet 140 may be used, for example, as a substrate or base film for forming the radiation pattern 130, and may be used as an upper dielectric layer of the radiation pattern 130. The protective sheet 140 may include an organic resin material having a detachable adhesive property. In some embodiments, the protective sheet 140 may include a laminate structure of a base sheet and an adhesive layer.

For example, the substrate may include a transparent resin material such as acrylic resin, olefin resin, polyimide-based resin, and polyurethane-based resin. The substrate may comprise an inorganic insulating material such as glass, silicon oxide and silicon nitride.

The radiation pattern 130 may be formed on one surface of the protective sheet 140. In some embodiments, the radiation pattern 130 may be formed on a substrate, and an adhesive layer may be formed on one surface of the protective sheet 140 to cover the radiation pattern 130. In one embodiment, a release film may be formed on the adhesive layer.

For example, as shown in fig. 2, the radiation pattern 130 may be formed on the outer circumferential portion of the protective sheet 140. As will be described later, when the antenna sheet 150 is attached to a visible surface or a window surface of the display device, the radiation pattern 130 may be provided on the peripheral portion to prevent image degradation achieved by the display device.

The radiation pattern 130 may include 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), calcium (Ca), or an alloy containing at least one of them. They may be used alone or in combination.

For example, the radiation pattern 130 may include silver (Ag) or a silver alloy (e.g., silver-palladium-copper (APC)) or copper (Cu) or a copper alloy (e.g., (copper-calcium (CuCa)) to achieve a low resistance and fine line width pattern.

In one embodiment, the radiation pattern 130 may include a transparent conductive oxide, such as Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), zinc oxide (ZnOx), Indium Zinc Tin Oxide (IZTO), and the like.

In some embodiments, the radiation pattern 130 may include a stacked structure of a transparent conductive oxide layer and a metal layer. For example, the radiation pattern 130 may include a double-layer structure of a transparent conductive oxide layer-metal layer, or a triple-layer structure of a transparent conductive oxide layer-metal layer-transparent conductive oxide layer. In this case, flexibility can be improved by the metal layer, and the signal transmission speed can be improved by the low resistance of the metal layer. The corrosion resistance and transparency can be improved by the transparent conductive oxide layer.

In some embodiments, the radiation pattern 130 may have a mesh pattern structure. Accordingly, even when the antenna sheet 150 is attached to the visible surface of the display device, the radiation pattern 130 may have improved light transmittance and may be prevented from being visually recognized by a user.

As shown in fig. 2, the radiation pattern 130 may have a polygonal flat plate shape. However, the shape of the radiation pattern 130 may be appropriately changed in consideration of the design and radiation characteristics of the display device. For example, the radiation pattern 130 may have a shape such as a circle or an ellipse.

The antenna sheet 150 may be attached on the dielectric interlayer 110 to be coupled to the feeding line 120. The power feed line 120 may be formed on the base dielectric layer 100.

The base dielectric layer 100 and/or the dielectric interlayer 110 may include, for example, a transparent resin material. For example, the base dielectric layer 100 and/or the dielectric interlayer 110 may include polyester-based resins such as polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, and polybutylene terephthalate; cellulose-based resins such as diacetyl cellulose and triacetyl cellulose; a polycarbonate-series resin; acrylic resins such as polymethyl (meth) acrylate and polyethyl (meth) acrylate; styrenic resins such as polystyrene and acrylonitrile-styrene copolymer; polyolefin-based resins such as polyethylene, polypropylene, cycloolefin or polyolefin having a norbornene structure and ethylene-propylene copolymer; vinyl chloride-based resins; amide-based resins such as nylon and aramid; an imide resin; polyether sulfone resins; sulfone resins; polyether ether ketone resin; polyphenylene sulfide resin; a vinyl alcohol resin; vinylidene chloride resin; vinyl butyral resins; an allylic resin; a polyoxymethylene resin; an epoxy resin; polyurethane or acrylic urethane resins; silicone resins, and the like. They may be used alone or in combination of two or more.

In some embodiments, an adhesive film such as Optically Clear Adhesive (OCA) or Optically Clear Resin (OCR) may be included in the base dielectric layer 100 and/or the dielectric interlayer 110. In some embodiments, the base dielectric layer 100 and/or the dielectric interlayer 110 may include an inorganic insulating material such as silicon oxide, silicon nitride, silicon oxynitride, glass, or the like.

In some embodiments, the dielectric constant of the base dielectric layer 100 and/or the dielectric interlayer 110 may be adjusted to be in the range of about 1.5 to about 12. When the dielectric constant exceeds about 12, the driving frequency realized by the radiation pattern 130 may be excessively lowered, so that the desired driving at the high frequency band or the ultra high frequency band may not be realized.

The power feeding line 120 may be disposed on the base dielectric layer 100, and the dielectric interlayer 110 may be stacked on the base dielectric layer 100 and the power feeding line 120.

The feed line 120 may include the above-described metal or alloy. The power feeding line 120 may be formed as a solid metal pattern to reduce the power feeding resistance and facilitate signal transmission.

In an exemplary embodiment, the feeding line 120 may be physically spaced apart from the radiation pattern 130 with the dielectric interlayer 110 interposed therebetween. For example, the radiation pattern 130 may be a floating electrode separated from the feeding line 120 by the dielectric interlayer 110.

In some embodiments, one end of the power feeding line 120 may overlap with the radiation pattern 130 in a thickness direction of the antenna device, and an opposite end of the power feeding line 120 may be joined to the circuit board 160.

The circuit board 160 may include, for example, a Flexible Printed Circuit Board (FPCB). For example, a conductive bonding structure such as an Anisotropic Conductive Film (ACF) may be bonded on the opposite ends of the power feeding line 120, and then the circuit board 160 may be heated and pressed on the conductive bonding structure.

An antenna driving Integrated Circuit (IC) chip may be mounted on the circuit board 160. In one embodiment, an intermediate circuit board such as a rigid printed circuit board may be disposed between the circuit board 160 and the antenna driving IC chip. In one embodiment, the antenna driving IC chip may be directly mounted on the circuit board 160.

Power may be supplied from the antenna driving IC chip to the power supply line 120 via the circuit board 160, and an electric field may be generated between the radiation pattern 130 and the power supply line 120 in the dielectric interlayer 110. Therefore, antenna radiation can be achieved by coupling of the radiation pattern 130 and the power feeding line 120.

In some embodiments, a ground layer 90 may be formed on the bottom surface of the base dielectric layer 100. The generation of an electric field in the power feeding line 120 can be facilitated by the ground layer 90, and the electric noise around the power feeding line 120 can be absorbed or shielded.

In some embodiments, ground plane 90 may be included as a separate element of the antenna device. In some embodiments, the conductive member of the display device on which the antenna device is mounted may be used as a ground layer.

The conductive member may include, for example, a gate electrode of a Thin Film Transistor (TFT) included in the display panel, various wirings such as a scan line or a data line, or various electrodes such as a pixel electrode and a common electrode.

In one embodiment, various structures including conductive materials disposed under the display panel may be used as the ground layer 90. For example, a metal plate (e.g., a stainless steel plate such as a SUS plate), a pressure sensor, a fingerprint sensor, an electromagnetic wave shielding layer, a heat sink, a digitizer, or the like may be used as the ground layer 90.

According to the above-described exemplary embodiment, the detachable antenna sheet 150 may be attached on the dielectric interlayer 110 to be coupled to the feeding line 120, so that antenna radiation driving may be achieved. Therefore, the antenna sheet 150 formed with the radiation pattern 130 can be easily replaced according to the frequency environment of each region (or each country).

Therefore, even if radiation patterns for all frequencies are not inserted into the display device, a desired communication function can be achieved by attaching and detaching the antenna sheet 150.

The antenna sheet 150 may be attached to or detached from a window surface of the display device. Accordingly, radiation interference caused by a conductive structure included in the display device can be reduced, and a multiband or broadband communication function can be easily applied to the display device.

In some embodiments, as shown in fig. 2, an alignment pattern 135 may be further formed around the radiation pattern 130 on the protective sheet 140. When the antenna sheet 135 is attached and detached with respect to the window surface using the alignment pattern 135, the antenna sheet 150 can be easily aligned and attached to overlap the one end portion of the power feeding line 120.

Referring to fig. 3, the radiation pattern 130 included in the antenna sheet 150 may be connected to the feeder line 120 through the via structure 125. For example, the via structure 125 may be formed through the dielectric interlayer 110 and may be in contact with the one end portion of the feed line 120 and the bottom surface of the radiation pattern 130.

The via structure 125 may include the metals or alloys described above to reduce the feed resistance. The efficiency of power supply from the power feeding line 120 to the radiation pattern 130 can be further improved by the via structure 125.

Referring to fig. 4, the dielectric interlayer 110 may have a multi-layer structure. For example, the dielectric interlayer 110 may include a first dielectric interlayer 112 and a second dielectric interlayer 115.

In some embodiments, first dielectric interlayer 112 may include an adhesive layer such as an OCA film. The second dielectric interlayer 115 may be stacked on the first dielectric interlayer 112 and may include a window sheet of a display device. The window sheet may include, for example, a window film of a display device or a hard coating film or glass (e.g., ultra-thin glass (UTG)) for a window substrate.

In an exemplary embodiment, the via structure 125 may partially extend through the dielectric interlayer 110. For example, the via structure 125 may be formed in the first dielectric interlayer 112 and may not extend into the second dielectric interlayer 115. Accordingly, the radiation pattern 130 may not contact the feeder line 120 and the via structure 125, and may be a suspended pattern on the second dielectric interlayer 115.

As described with reference to fig. 1, the antenna radiation may be realized by generating an electric field through coupling between the power feeding line 120 and the radiation pattern 130. The via structure 125 may serve as a radiation guiding pattern that may facilitate coupling or electric field generation.

Fig. 5 is a schematic top plan view illustrating an antenna apparatus according to some example embodiments. For convenience of description, illustration of the dielectric interlayer 110 and the protective sheet 140 is omitted in fig. 5.

Referring to fig. 5, the antenna device may further include an internal antenna element 170 in addition to the radiation pattern 130 included in the antenna sheet 150 described with reference to fig. 1 to 4. In an exemplary embodiment, the internal antenna element 170 and the radiation pattern 130 may be located at different layers or at different levels.

For example, the internal antenna unit 170 may be formed on the base dielectric layer 100 together with the power feed line 120 and may be inserted into the display device in the form of a patch antenna. As described above, the radiation pattern 130 may be formed on the protective sheet 140 and disposed on the dielectric interlayer 110.

The internal antenna element 170 may include an internal radiation pattern 172 and a transmission line 174. The inner radiation pattern 172 may have, for example, a polygonal plate shape, and the transmission line 174 may protrude from one side of the inner radiation pattern 172. The transmission line 174 may be formed as a single member substantially integral with the internal radiation pattern 172.

The internal antenna element 170 may also include a signal pad 176. The signal pad 176 may be connected to one end of the transmission line 174. In one embodiment, the signal pad 176 may be formed as a substantially integral member with the transmission line 174, and the one end of the transmission line 174 may be provided as the signal pad 176.

In some embodiments, ground pad 178 may be disposed around signal pad 176. For example, a pair of ground pads 178 may face each other with the signal pads 178 interposed therebetween. Ground pad 178 may be electrically and physically separated from transmission line 174 around signal pad 176.

The internal antenna element 170 may include the above-described metal or alloy (e.g., APC alloy or CuCa alloy). The internal antenna unit 170 may include a transparent conductive oxide, such as Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), zinc oxide (ZnO), Indium Zinc Tin Oxide (IZTO), Cadmium Tin Oxide (CTO), and the like.

In some embodiments, the internal antenna element 170 may include a multilayer structure of transparent conductive oxide layers and metal layers. For example, the internal antenna element 170 may have a double-layer structure of a transparent conductive oxide layer-metal layer, or a triple-layer structure of a transparent conductive oxide layer-metal layer-transparent conductive oxide layer.

The internal radiation pattern 172 may be disposed in a display area of the display device. In some embodiments, a portion of the transmission line 174 may also be disposed in the display area.

Accordingly, the radiation pattern 172 and the transmission line 174 may be formed to include a mesh pattern structure to prevent the light transmittance in the display region from being lowered.

The signal pads 176 and the ground pads 178 may be formed as a solid metal pattern to reduce the feed resistance through the circuit board 160 and prevent signal loss. In one embodiment, transmission line 174 may partially comprise a solid metal pattern.

The circuit board 160 shown in fig. 1 may be joined together with the opposite ends of the power feeding lines 120 on the signal pads 176. The ground pad 178 may be disposed around the signal pad 176, so that the bonding stability of the circuit board 160 may be further improved.

For example, the internal antenna unit 170 may be an antenna that can be basically applied to a display device as a single product. Predetermined antenna radiation may be provided through the internal antenna unit 170, and the detachable antenna sheet 150 may be used to further expand radiation coverage according to a local frequency environment.

Fig. 6 and 7 are a schematic cross-sectional view and a schematic top plan view, respectively, illustrating a display device according to an exemplary embodiment. For example, fig. 7 illustrates a window or front side of a display device manufactured in the form of a smart phone.

Referring to fig. 6, the display device 200 may include a display panel 230 and the above-described antenna device stacked on the display panel 230.

The display panel 230 may include a panel substrate, a TFT circuit structure formed on the panel substrate, a pixel electrode connected to the TFT circuit structure, a display layer (e.g., an organic light emitting layer or a liquid crystal layer) formed on the pixel electrode, a common electrode covering the display layer, an encapsulation layer covering the common electrode, and the like. For example, the display panel 230 may be an Organic Light Emitting Diode (OLED) panel.

The antenna device may be stacked on the display panel 230. For example, the detachable antenna sheet 150 may be stacked on the dielectric interlayer 110. The dielectric interlayer 110 may include a window sheet providing a window side of a display device as described above. In one embodiment, a window sheet may be stacked on the dielectric interlayer 110, and the antenna sheet 150 may be attached on the window sheet.

A touch sensor layer 240 and a polarization layer 250 may also be included between the display panel 230 and the antenna device. For example, the touch sensor layer 240, the polarizing layer 250, and the antenna device may be sequentially stacked from the display panel 230. In this case, the sensing electrodes included in the touch sensor layer 240 can be effectively prevented from being visually recognized by a user. In addition, the polarization layer 250 may be included as a lower dielectric layer of the antenna device.

Referring to fig. 7, the display device 200 may include a display area 210 and a peripheral area 220. For example, the peripheral region 220 may be located on both lateral portions and/or both end portions of the display region 210.

In some embodiments, the power feeding line 120 of the antenna device may be disposed in a peripheral region of the display device, and the radiation pattern 130 included in the antenna sheet 150 may be at least partially disposed on the display region 210.

The outer peripheral region 220 may correspond to, for example, a light shielding portion or a frame portion of the image display device. In addition, a driving circuit such as a driving Integrated Circuit (IC) chip for the display device 200 and/or the antenna may be disposed in the peripheral region 220.

The circuit board 160 may be disposed in the outer circumferential region 220, and may be bent toward the rear of the display device 200 so as to be electrically connected with the main board or the antenna driving IC chip.

Claims

1. An antenna device, characterized in that it comprises:

a feed line;

a dielectric interlayer disposed on the feed line; and

an antenna sheet detachably combined with the dielectric interlayer, the antenna sheet including a protective sheet and a radiation pattern formed on a surface of the protective sheet.

2. The antenna device according to claim 1, wherein the radiation pattern overlaps with one end portion of the power feed line in a thickness direction.

3. The antenna device according to claim 2, characterized in that the radiation pattern is physically separated from the feed line with the dielectric interlayer interposed therebetween.

4. The antenna device according to claim 2, characterized by further comprising a via structure that penetrates the dielectric interlayer and connects the one end portion of the feed line and the radiation pattern to each other.

5. The antenna device according to claim 2, characterized in that it further comprises a via structure connected to said one end of the feed line and partially penetrating the dielectric interlayer.

6. The antenna device of claim 5, wherein the via structure is physically separated from the radiation pattern.

7. The antenna device according to claim 6, wherein the dielectric interlayer includes a first dielectric interlayer and a second dielectric interlayer stacked in order from the feed line, and

the via structure is formed in the first dielectric interlayer and does not extend into the second dielectric interlayer.

8. The antenna device of claim 7, wherein the first dielectric interlayer comprises an adhesive layer and the second dielectric interlayer comprises a window sheet.

9. The antenna device according to claim 1, characterized in that it further comprises a base dielectric layer on which the feed line is formed.

10. The antenna device according to claim 9, further comprising an internal antenna element disposed on the base dielectric layer.

11. The antenna device according to claim 10, wherein the internal antenna element comprises an internal radiation pattern and a transmission line extending from the internal radiation pattern.

12. The antenna device according to claim 11, characterized in that the internal antenna element and the feed line are separated from each other at the same level or layer.

13. The antenna device according to claim 1, wherein the antenna sheet further comprises an alignment pattern formed on the protective sheet around the radiation pattern.

14. A display device, characterized in that it comprises:

a display panel; and

the antenna device according to claim 1 stacked on the display panel.

15. The display device according to claim 14, wherein the dielectric interlayer comprises a window sheet, and wherein the antenna sheet is attached to the window sheet.