KR102238605B1 - Portable device and near field communication chip - Google Patents

Abstract

The portable device is a display panel, a case that supports the display panel, includes a conductive material, and has first and second terminals spaced apart from each other, and is connected to at least one of the first and second terminals of the case, A near field communication (NFC) chip for supplying an electric signal to the case so that the case radiates a first magnetic field, and a near field communication (NFC) chip located in the case spaced apart from the case, and magnetically coupled to the case And a loop antenna that forms a second magnetic field in response to the first magnetic field formed in the case. Accordingly, the mobile device can perform NFC communication using the case and the loop antenna.

Description

Portable device and short-range wireless communication chip {PORTABLE DEVICE AND NEAR FIELD COMMUNICATION CHIP}

The present invention relates to an electronic device, and more particularly, to a portable device, and a short-range wireless communication chip embedded in the portable device.

Portable devices such as smart phones are widely used due to their high portability. In addition, as a type of portable device, the use of wearable electronic devices that are worn while worn on a human body, such as a wrist, a neck, or a head, is gradually increasing. However, a portable device such as a conventional wearable electronic device cannot provide near field communication (NFC), or NFC communication is performed on the opposite side of the side on which the display of the wearable electronic device is located, so that the wearable electronic device is connected. It is inconvenient to take off NFC communication.

In order to solve the above problems, an object of the present invention is to provide a portable device capable of performing near field communication (NFC) using a case and a loop antenna.

In addition, another object of the present invention is to provide an NFC chip capable of performing short-range wireless communication using a case and a loop antenna of a portable device.

However, the problem to be solved of the present invention is not limited to the above-mentioned problems, and may be variously expanded without departing from the spirit and scope of the present invention.

In order to achieve the above object, a portable device according to embodiments of the present invention includes a display panel, a case supporting the display panel, including a conductive material, and having first and second terminals spaced apart from each other. Near field communication (NFC) chip connected to at least one of the first and second terminals of the case and supplying an electric signal to the case so that the case radiates a first magnetic field, and in the case And a loop antenna positioned apart from the case and magnetically coupled to the case to form a second magnetic field in response to the first magnetic field formed in the case.

In one embodiment, a side edge portion of the case may have an integrated structure without a slit.

In an embodiment, the first and second terminals of the case may be spaced apart from each other so that the loop antenna is disposed between the first and second terminals.

In one embodiment, a side edge portion of the case may have a circular, oval, or polygonal shape.

In one embodiment, the case may be a metal case including a metal material.

In one embodiment, the loop antenna may be physically disconnected from the NFC chip.

In one embodiment, the loop antenna is positioned in the case to be spaced apart from the case, formed of a metal material, a loop coil having a first end and a second end, and the first end and the second end of the loop coil It may include a capacitor connected between the stages.

In one embodiment, the loop coil may have a circular, elliptical, or polygonal shape.

In one embodiment, the loop coil may have a multilayer structure.

In one embodiment, the capacitor may be a chip capacitor.

In one embodiment, the capacitor may be formed by metal patterns extending from the first end and the second end of the loop coil.

In one embodiment, the case and the loop antenna may have the same resonance frequency.

In one embodiment, the portable device further comprises a main board located in the case and on which a processor for controlling an operation of the portable device is disposed, and the roof antenna may be positioned between the display panel and the main board. have.

In an embodiment, the loop antenna may radiate the second magnetic field in a direction passing through the display panel.

In an embodiment, a magnetic sheet disposed between the roof antenna and the main board may be further included.

In one embodiment, the portable device further comprises a main board located in the case and on which a processor for controlling the operation of the portable device is disposed, and the case includes a side edge portion formed of the conductive material, and a non-conductive It may include a rear cover part formed of a material, and the roof antenna may be located between the main board and the rear cover part of the case.

In one embodiment, the loop antenna may radiate the second magnetic field in a direction passing through the rear cover part of the case.

In an embodiment, the portable device may further include a magnetic sheet disposed between the main board and the roof antenna.

In an embodiment, the portable device may further include a main board positioned in the case and on which a processor for controlling an operation of the portable device is disposed. The case may include a side edge portion formed of the conductive material and a rear cover portion formed of a non-conductive material. The roof antenna may include a first loop antenna disposed between the display panel and the main board, and a second roof antenna disposed between the main board and the rear cover portion of the case.

In one embodiment, the first loop antenna may radiate the second magnetic field in a direction passing through the display panel, and the second loop antenna may radiate the second magnetic field in a direction passing through the rear cover portion of the case. Can radiate.

In an embodiment, the portable device may further include a loop coil connected to the NFC chip in parallel with the case and disposed to surround the loop antenna.

In one embodiment, the loop coil may additionally radiate the first magnetic field based on the electric signal supplied from the NFC chip.

In an embodiment, the portable device may further include a matching circuit connected between the NFC chip and the case and performing impedance matching between the NFC chip and the case.

In an embodiment, the NFC chip may output a differential electrical signal as the electrical signal, and the first and second terminals of the case may receive the differential electrical signal through the matching circuit.

In one embodiment, the NFC chip may output a single-ended electrical signal as the electrical signal, and one of the first and second terminals of the case is the single-ended electrical signal through the matching circuit. An end-type electrical signal may be received, and the other one of the first and second terminals of the case may be grounded.

In one embodiment, the NFC chip may output a differential electrical signal as the electrical signal, the matching circuit may include a transformer (transformer) for converting the differential electrical signal into a single-ended electrical signal, the One of the first and second terminals of the case may receive the single-ended electrical signal from the transformer, and the other of the first and second terminals of the case may be grounded.

In one embodiment, the portable device may further include an inductor connected between the matching circuit and the case.

In an embodiment, the portable device may further include a low pass filter connected between the matching circuit and the case.

In one embodiment, the portable device may further include a wireless charging circuit connected to the loop antenna and receiving power wirelessly through the loop antenna.

In an embodiment, the portable device may further include a magnetic secure transmission circuit connected to the loop antenna and performing magnetic secure transmission through the loop antenna.

In an embodiment, the portable device may be a wearable electronic device worn on a human body.

In an embodiment, the wearable electronic device may perform pairing with an external device, electronic payment, or data transmission by radiating the first and second magnetic fields while worn on the human body.

In order to achieve the above object, a portable device according to embodiments of the present invention includes a display panel, a near field communication (NFC) chip that outputs a differential electric signal, and is connected to the NFC chip, and the NFC A matching circuit for converting the differential electrical signal received from a chip into a single-ended electrical signal and performing impedance matching, a first terminal supporting the display panel, including a conductive material, and connected to the matching circuit, and A case that is spaced apart from the first terminal and has a second terminal connected to a ground voltage, and radiates a first magnetic field in response to the single-ended electrical signal received from the matching circuit, and is located in the case and spaced apart from the case. And a loop antenna magnetically coupled to the case to form a second magnetic field in response to the first magnetic field formed in the case.

In an embodiment, the matching circuit includes first and second input terminals respectively connected to the first and second transmission terminals of the NFC chip, a first output terminal connected to the first terminal of the case, and the A transformer having a second output terminal connected to a ground voltage and converting the differential electrical signal into the single-ended electrical signal may be included.

In an embodiment, the matching circuit includes a first inductor connected between the first transmission terminal of the NFC chip and the first input terminal of the transformer, the second transmission terminal of the NFC chip, and the first inductor of the transformer. 2 A second inductor connected between input terminals, a first capacitor connected between the first terminal of the case and the ground voltage, a second capacitor connected between the first output terminal of the transformer and the first terminal of the case And a third capacitor connected between the first input terminal and the second input terminal of the transformer.

In order to achieve the other object, a near field communication (NFC) chip according to embodiments of the present invention supports a display panel, the display panel, and has first and second terminals spaced apart from each other. It is embedded in a portable device including a case, and a loop antenna positioned in the case and spaced apart from the case, and magnetically coupled to the case. The NFC chip is connected to at least one of the first and second terminals of the case, the case radiates a first magnetic field, and the loop antenna forms a second magnetic field in response to the first magnetic field. It includes an NFC controller that supplies electrical signals to the case.

In an embodiment, the NFC chip may further include a secure storage device connected to the NFC controller and storing information transmitted to an external device using the first and second magnetic fields.

Near field communication (NFC) chips and portable devices according to embodiments of the present invention use a case including a conductive material and a loop antenna magnetically coupled to the case. Communication can be performed.

In addition, the NFC chip and the portable device according to the embodiments of the present invention may improve the waterproof function and design aesthetics of the case by performing NFC communication using a case having an integrated structure without a slit.

However, the effects of the present invention are not limited to the above-mentioned effects, and may be variously extended without departing from the spirit and scope of the present invention.

1 is a diagram illustrating an example of a portable device according to embodiments of the present invention.
2 is a diagram illustrating a configuration of a portable device according to embodiments of the present invention.
3 is a diagram illustrating an example of a case used in a portable device according to embodiments of the present invention.
4 is a diagram illustrating an example of a loop antenna used in a portable device according to embodiments of the present invention.
5 is a diagram illustrating another example of a loop antenna used in a portable device according to embodiments of the present invention.
6A to 6D are diagrams for explaining examples of capacitors included in a loop antenna of a portable device according to embodiments of the present invention.
7 is a diagram illustrating a portable device according to an embodiment of the present invention.
8 is a diagram illustrating a configuration of a portable device according to an embodiment of the present invention.
9 is a diagram illustrating a portable device according to another embodiment of the present invention.
10 is a diagram for describing a configuration of a portable device according to another embodiment of the present invention.
11 is a diagram illustrating a portable device according to another embodiment of the present invention.
12 is a diagram for describing a configuration of a portable device according to another embodiment of the present invention.
13A is a view for explaining the configuration of a portable device according to another embodiment of the present invention, and FIG. 13B is a diagram for explaining a connection relationship between a case, a loop coil, and a near field communication (NFC) chip to be.
14 is a diagram illustrating an example of a connection relationship between an NFC chip, a matching circuit, a case, and a loop antenna in a portable device according to embodiments of the present invention.
15 is a diagram illustrating another example of a connection relationship between an NFC chip, a matching circuit, a case, and a loop antenna in a portable device according to embodiments of the present invention.
16 is a diagram for describing another example of a connection relationship between an NFC chip, a matching circuit, a case, and a loop antenna in a portable device according to embodiments of the present invention.
17 is a diagram for describing a portable device further including an inductor between a matching circuit and a case according to embodiments of the present invention.
18 is a diagram for describing a portable device further including a low pass filter between a matching circuit and a case according to example embodiments.
FIG. 19 is a diagram for describing a portable device that performs NFC communication, wireless charging, and/or magnetic secure transmission according to embodiments of the present invention.
20 is a diagram for describing a configuration of a portable device according to other embodiments of the present invention.
21 is a diagram illustrating an example in which a mobile device performs NFC communication according to embodiments of the present invention.
22 is a diagram illustrating another example in which a mobile device performs NFC communication according to embodiments of the present invention.

With respect to the embodiments of the present invention disclosed in the text, specific structural or functional descriptions have been exemplified for the purpose of describing the embodiments of the present invention only, and the embodiments of the present invention may be implemented in various forms. It should not be construed as being limited to the embodiments described in.

Since the present invention can be modified in various ways and has various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific form disclosed, it should be understood to include all changes, equivalents, or substitutes included in the spirit and scope of the present invention.

Terms such as first and second may be used to describe various constituent elements, but the constituent elements should not be limited by the terms. The terms may be used for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it is directly connected to or may be connected to the other component, but other components may exist in the middle. It should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle. Other expressions describing the relationship between components, such as "between" and "directly between" or "adjacent to" and "directly adjacent to" should be interpreted as well.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the existence of a specified feature, number, step, action, component, part, or combination thereof, but one or more other features or numbers. It is to be understood that it does not preclude the possibility of the presence or addition of, steps, actions, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein including technical or scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in the present application. .

Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The same or similar reference numerals are used for the same components in the drawings.

1 is a view showing an example of a portable device according to embodiments of the present invention, FIG. 2 is a diagram for explaining a configuration of a portable device according to embodiments of the present invention, and FIG. 3 is an exemplary embodiment of the present invention. A diagram showing an example of a case employed in a portable device according to the examples, FIG. 4 is a diagram showing an example of a loop antenna employed in a portable device according to embodiments of the present invention, and FIG. 5 is A diagram showing another example of a loop antenna used in a portable device according to embodiments, and FIGS. 6A to 6D are diagrams for explaining examples of capacitors included in a loop antenna of a portable device according to embodiments of the present invention admit.

Referring to FIG. 1, a portable device 100 according to embodiments of the present invention may be any electronic device that can be carried by a user. For example, the portable device 100 includes a cellular phone, a smart phone, a tablet PC, a laptop computer, a personal digital assistant (PDA), and a portable multimedia player. Portable multimedia player (PMP), digital camera (Digital Camera), music player (Music Player), portable game console (portable game console), may be any portable device such as navigation (Navigation).

In one embodiment, the portable device 100 may be a wearable electronic device 100 that can be worn and used on a human body such as a user's wrist, neck, or head, as shown in FIG. 1. In one example, the portable device 100 is a wrist-worn electronic device 100 such as a smart watch or a wrist band electronic device, as shown in FIG. 1. I can. In another example, the portable device 100 may be any wearable electronic device such as a necklace type electronic device, a glasses type electronic device, or the like.

In one embodiment, the external appearance of the portable device 100 may be formed by a display panel 120, a case 140, and a band portion 160, as shown in FIG. 1. The display panel 120 may display an image. Depending on the embodiment, the display panel 120 may be an organic light emitting diode (OLED) display panel or a liquid crystal display (LCD) panel, but is not limited thereto. In addition, according to an embodiment, the display panel 120 may be a curved display panel having a curved shape or a flat panel display having a flat shape, but is not limited thereto. In addition, the display panel 120 may have various shapes such as a circle, an oval, and a polygon. In addition, in one embodiment, the display panel 120 is of various types such as an add-on type, an on-cell type, an in-cell type, etc. It may include a touch sensor.

The band unit 160 may be configured to be easily worn by a user, and according to an embodiment, rubber, silicone, plastic, mylar, vinyl, metal ) And the like.

The case 140 may support the display panel 120 and define an inner space together with the display panel 120. Depending on the embodiment, the case 140 may expose a button, a camera lens, an infrared module, or the like. The case 140 may include a conductive material. In one embodiment, the case 140 may be a metal case including a metal material, and at least a portion of the metal case may be formed of any metal material having a predetermined strength and electrical conductivity. In one embodiment, the case 140 has a side edge portion and a rear cover portion, the side edge portion of the case 140 is formed of a conductive material or a metal material, and the rear cover portion of the case 140 is formed of a non-conductive material. Can be formed. In another embodiment, the case 140 may have a unitary structure in which both the side edge portion and the rear cover portion are integrally formed of a conductive material or a metal material. For example, the side edge portion and/or the rear cover portion of the case 140 is copper (Cu), aluminum (Al), iron (Fe), titanium (Ti), silver (Ag), palladium (Pd), platinum It may contain at least one of (Pt), gold (Au), or nickel (Ni). Since at least a part of the case 140 is formed of a metal material, the strength of the portable device 100 can be improved, and the portable device 100 can have a beautiful appearance.

A main board in which various electrical components are disposed may be accommodated in the inner space defined by the case 140. For example, a processor that controls the operation of the portable device 100 may be disposed on the main board. For example, the processor may be an arbitrary processor such as an application processor (AP), a central processing unit (CPU), a microcontroller (MCU), or the like. Further, a memory for storing data necessary for the operation of the portable device 100 may be further disposed on the main board. For example, the memory may store a boot image for booting the portable device 100 and may store data transmitted/received to an external device. For example, the memory is a volatile memory such as DRAM (Dynamic Random Access Memory), SRAM (Static Random Access Memory), mobile DRAM, DDR SDRAM, LPDDR SDRAM, GDDR SDRAM, RDRAM, and/or EEPROM (Electrically Erasable Programmable Read). -Only Memory), Flash Memory, PRAM (Phase Change Random Access Memory), RRAM (Resistance Random Access Memory), NFGM (Nano Floating Gate Memory), PoRAM (Polymer Random Access Memory), MRAM (Magnetic Random Access) Memory), ferroelectric random access memory (FRAM), and the like. In an embodiment, the processor and the memory may be packaged in a PoP (Package on Package) method. In another embodiment, the processor and the memory may be mounted using various types of packages, for example, BGAs (Ball grid arrays), CSPs (Chip scale packages), PLCC (Plastic Leaded Chip Carrier), PDIP (Plastic Dual In-Line Package), Die in Waffle Pack, Die in Wafer Form, COB(Chip On Board), CERDIP(Ceramic Dual In-Line Package), MQFP(Plastic Metric Quad Flat Pack), TQFP(Thin Quad Flat) -Pack), SOIC(Small Outline Integrated Circuit), SSOP(Shrink Small Outline Package), TSOP(Thin Small Outline Package), TQFP(Thin Quad Flat-Pack), SIP(System In Package), MCP(Multi Chip Package) , Wafer-level Fabricated Package (WFP), Wafer-Level Processed Stack Package (WSP), and the like may be implemented.

In addition, according to an embodiment, a power management integrated circuit (PMIC), a sensor, an audio codec, a Bluetooth controller, and the like may be further disposed on the main board. For example, the sensor may include an accelerometer, a gyroscope, a heart rate sensor, and the like. In addition, according to an embodiment, the processor, the memory, the PMIC, the sensor, and the like may be disposed on one surface of the main board or may be disposed on both surfaces of the main board.

The portable device 100 may include a near field communication (NFC) chip connected to the case 140. In one embodiment, the NFC chip may be disposed in the inner space defined by the case 140. In another embodiment, the NFC chip may be disposed inside the band unit 160. The NFC chip may include an NFC controller connected to the case 140. The NFC controller may perform NFC communication by providing an electric signal to the case 140. In addition, in an embodiment, the NFC chip may further include a secure storage device connected to the NFC controller. The secure storage device may store information transmitted to an external device through the NFC communication. For example, the secure storage device may store payment information (eg, credit card information), an encryption key, and the like. Also, for example, the secure storage device may be an embedded secure element (eSE). In addition, in an embodiment, the NFC controller and the secure storage device may be packaged as a single chip in a SIP (System In Package) method.

The case 140 has first and second terminals spaced apart from each other, and the NFC chip may be connected to at least one of the first and second terminals of the case 140. In one embodiment, the NFC chip may output a differential electrical signal, and the first and second terminals of the case 140 may be connected to the NFC chip to receive the differential electrical signal. In another embodiment, the NFC chip outputs a single-ended electrical signal, and one of the first and second terminals of the case 140 receives the single-ended electrical signal. It is connected to the chip, and the other one of the first and second terminals of the case 140 may be grounded. In another embodiment, the NFC chip outputs a differential electrical signal, and the differential electrical signal is converted into a single-ended electrical signal by a transformer (e.g., a balun, balanced-to-unbalanced). , One of the first and second terminals of the case 140 is connected to the NFC chip through the transformer to receive the single-ended electrical signal, and the first and second terminals of the case 140 The other one can be grounded.

The NFC chip may supply an electric signal to the case 140, and the case 140 may emit a first magnetic field based on the electric signal. For example, as shown in FIG. 2, the cases 140 and 240 of the portable devices 100 and 200 have a first terminal T1 and a second terminal T2 spaced apart from each other, and the NFC chip is The electric signal may be applied to the first terminal T1 and/or the second terminal T2 of the cases 140 and 240. Meanwhile, in the cases 140 and 240, a current path 250 may be formed between the first terminal T1 and the second terminal T2. Depending on the embodiment, the current path 250 is formed in the direction from the first terminal T1 to the second terminal T2, from the second terminal T2 to the first terminal T1, or The direction of the path 250 may be dynamically changed. Meanwhile, the first terminal T1 and the second terminal T2 may be spaced apart from each other so that the length of the current path 250 is sufficiently secured. In an embodiment, as shown in FIG. 2, the first and second terminals T1 and T2 of the cases 140 and 240 are loop antennas between the first and second terminals T1 and T2. (280, C) can be spaced apart from each other so that they are placed. For example, the second terminal T2 may be disposed close to a line 265 connecting the center point of the inner space 260 defined by the first terminal T1 and the cases 140 and 240. In this case, the current path 250 is a region having a relatively short length among regions of the cases 140 and 240 between the first terminal T1 and the second terminal T2 (in the example of FIG. 2, the case ( 140, 240). On the other hand, when the electric signal is applied from the NFC chip to the first terminal T1 and/or the second terminal T2, the electric signal (eg, current) is transferred to the current path ( 250), and accordingly, the cases 140 and 240 may emit a first magnetic field. Meanwhile, the cases 140 and 240 may radiate the first magnetic field not only to the outside of the portable devices 100 and 200 but also to the inner space 260.

Meanwhile, FIG. 2 shows an example in which the side rim portions of the cases 140 and 240 have a circular shape. I can have it. For example, as shown in FIG. 3, a side edge portion of the case 240a defining the inner space 260a may have a rectangular shape. In this case, so that the length of the current path 250a is sufficiently secured, the case 240a is spaced apart from each other and arranged to be adjacent to the line 265a bisecting the case 240a. T2).

Meanwhile, in a conventional portable device using a case or a side edge portion of the case as an antenna, a slit is formed on the side edge portion of the case, and terminals to which an electric signal is applied are sandwiched between the slit (or an insulator filled in the slit). They were placed adjacent to each other. However, in the portable devices 100 and 200 according to embodiments of the present invention, the cases 140 and 240 or side edges of the cases 140 and 240 may have an integrated structure without a slit. Accordingly, compared to a conventional portable device in which a slit (or an insulator filled in the slit) is formed on the side edge of the case, the cases 140 and 240 of the mobile devices 100 and 200 according to the embodiments of the present invention are The waterproof function can be improved, and the design aesthetics can be improved.

In addition, as shown in FIG. 2, in the inner space 260 defined by the cases 140 and 240 of the portable devices 100 and 200, a loop antenna 280 spaced apart from the cases 140 and 240 is located. C) can be further deployed. Further, the loop antennas 280 and C may be physically disconnected from the NFC chip without receiving the electric signal from the loop antenna. The loop antennas 280 and C may be inductively coupled, that is, magnetically coupled, with the cases 140 and 240. Accordingly, based on the first magnetic field radiated from the cases 140 and 240, the loop antennas 280 and C have the same direction as the current path 250 of the cases 140 and 240 (in the example of FIG. 2, A current may flow through the current path 290 (counterclockwise), and a second magnetic field may be radiated from the loop antennas 280 and C by this current flow. On the other hand, the portable devices 100 and 200 according to the embodiments of the present invention are relatively short compared to the conventional portable devices in which terminals are formed with a slit (or an insulator filled in the slit) interposed at the side edge of the case. Even if the magnetic field radiation efficiency of the cases 140 and 240 is reduced by having the current path 250, the magnetic field is additionally radiated by using the loop antennas 280 and C magnetically coupled to the cases 140 and 240. It can have high magnetic field radiation efficiency. Accordingly, the portable devices 100 and 200 according to embodiments of the present invention may efficiently perform NFC communication using the cases 140 and 240 and the loop antennas 280 and C. In one embodiment, so that the loop antennas 280 and C efficiently receive power by the first magnetic field radiated from the cases 140 and 240, the cases 140 and 240 and the loop antennas 280 and C are It may have substantially the same resonant frequency. For example, each of the cases 140 and 240 and the loop antennas 280 and C may have a resonant frequency of about 13.56 MHz.

In one embodiment, the loop antennas 280 and C are located in the inner space 260 defined by the cases 140 and 240 and have a first end E1 and a second end E2. ), and a capacitor C connected between the first end E1 and the second end E2 of the loop coil 280. The loop coil 280 may be formed of any metal material having high conductivity such as copper, silver, aluminum, or the like. Depending on the embodiment, the loop coil 280 may have a suitable number of turns to have a predetermined inductance. For example, the loop coil 280 may have 1 or 2 or more turns. Meanwhile, although an example in which the loop coil 280 has a circular shape is shown in FIG. 2, the loop coil 280 may have an arbitrary shape such as a circle, an ellipse, or a polygon. For example, as shown in FIG. 4, the loop coil 280a may have a rectangular shape. In addition, according to an embodiment, the loop coil 280 may be formed on a single layer or may have a multilayer structure formed from two or more layers. For example, as shown in FIG. 5, the loop antenna 300 is connected to the first loop coil 380a and the first loop coil 380a formed on the first layer L1, and is connected to the second layer L2. ) May include loop coils 380a and 380b having a multilayer structure including a second loop coil 380b formed in ). In addition, the loop antenna 300 may include a capacitor C connected between the first end E1 and the second end E2 of the multilayered loop coils 380a and 380b. Meanwhile, according to an embodiment, the first and second loop coils 380a and 380b are formed on different surfaces of the same substrate (or film) so that the loop coils 380a and 380b having a multilayer structure are formed, or It can be formed on other substrates (or films).

The capacitor (C) connected between the first end (E1) and the second end (E2) of the loop coil 280, the loop antennas (280, C) predetermined resonant frequency (for example, about 13.56 MHz) In order to have a resonant frequency of (for example, about 13.56 MHz), it may have a suitable capacitance. Depending on the embodiment, the capacitor C may be implemented in various forms. In one embodiment, as shown in FIG. 6A, the loop antenna 400a may include a chip capacitor 490a implemented in the form of an integrated circuit as a capacitor C. The chip capacitor 490a may be connected between the first and second terminals E1 and E2 of the loop coil 480a of the loop antenna 400a. In another embodiment, the capacitor C may be formed by metal patterns extending from the first end E1 and the second end E2 of the loop coil 280. In one example, as shown in FIG. 6B, the loop antenna 400b may include a Metal-Insulator-Metal (MIM) capacitor 490b. The MIM capacitor 490b extends from the first end E1 and the second end E2 of the loop coil 480b, and may be formed by metal patterns disposed on different layers. In another example, as shown in FIG. 6C, the loop antenna 400c may include an edge-coupled capacitor 490c. The edge couple capacitor 490c extends from the first end E1 and the second end E2 of the loop coil 480c, and may be formed by metal patterns disposed adjacent to each other. In another example, as shown in FIG. 6D, the loop antenna 400d may include an interdigital capacitor 490d. The interdigital capacitor 490d extends from the first end E1 and the second end E2 of the loop coil 480d and may be formed by metal patterns having a comb tooth shape.

The portable devices 100 and 200 according to the embodiments of the present invention radiate a first magnetic field using the cases 140 and 240 connected to the NFC chip, and are magnetically coupled to the cases 140 and 240. NFC communication may be performed by radiating a second magnetic field using the loop antennas 280 and C. In addition, in the portable devices 100 and 200 according to the embodiments of the present invention, the cases 140 and 240 (or the side edges of the cases 140 and 240) have an integrated structure without a slit, so that the case ( 140 and 240) and the portable devices 100 and 200 may have a waterproof function and improved design aesthetics. In addition, in the portable devices 100 and 200 according to the embodiments of the present invention, the loop antennas 280 and C magnetically coupled to the cases 140 and 240 are formed in the cases 140 and 240. By forming the second magnetic field in response to the first magnetic field, the magnetic field radiation efficiency of the portable devices 100 and 200 may be improved.

7 is a diagram illustrating a portable device according to an embodiment of the present invention, and FIG. 8 is a diagram illustrating a configuration of a portable device according to an embodiment of the present invention.

7 and 8, the portable device 500 includes a display panel 520, a case 540 supporting the display panel 520 and defining an internal space, and the internal space defined by the case 540. A main board 530 positioned at, a band unit 560 configured to be easily worn by a user, and a roof antenna 580 positioned between the display panel 520 and the main board 530 may be included.

The main board 530 is located in the case 540, and a processor that controls the operation of the portable device 500 may be disposed on the main board 530. Further, according to an embodiment, a memory, a PMIC, a sensor, etc. may be further disposed on the main board 530. In one embodiment, an NFC chip for performing NFC communication may be further disposed on the main board 530, and the NFC chip may be connected to the case 540.

The case 540 may define a side edge and a rear side of the portable device 500. In one embodiment, the case 540 may have a single structure. In another embodiment, the case 540 may have a side edge portion defining a side edge of the portable device 500, and a rear cover portion defining a rear surface of the portable device 500, and the side edge portion and the rear surface thereof The cover portions may be coupled to each other.

The case 540 may include a conductive material (eg, a metal material), and may emit a first magnetic field based on an electric signal applied from the NFC chip. That is, the portable device 500 may perform NFC communication by radiating the first magnetic field in all directions using the case 540. In addition, the first magnetic field radiated by the case 540 may be transmitted not only to the outside of the portable device 500 but also to the inside of the case 540. Accordingly, the first magnetic field radiated by the case 540 may be transmitted to the loop antenna 580 magnetically coupled to the case 540.

The roof antenna 580 may be disposed between the display panel 520 and the main board 530 in the case 540. The loop antenna 580 may be magnetically coupled to the case 540 to form a second magnetic field in response to the first magnetic field formed in the case 540. That is, when the NFC chip applies the electric signal to the terminals of the case 540, current flows through the case 540 between the terminals of the case 540, and accordingly, the first Magnetic fields can be radiated. The first magnetic field radiated from the case 540 is transmitted to the loop antenna 580, and a current is induced from the loop antenna 580 in the same direction as the case 540. Accordingly, the loop antenna 580 A second magnetic field may be emitted. Meanwhile, even if the second magnetic field radiated by the loop antenna 580 is shielded by the main board 530, it may pass through the display panel 520. Therefore, since the loop antenna 580 is disposed between the display panel 520 and the main board 530, the loop antenna 580 passes through the display panel 520, that is, in the front direction of the portable device 500. As a result, the second magnetic field may be radiated. Accordingly, the mobile device 500 may perform NFC communication with an external device located in the front direction of the mobile device 500.

On the other hand, in a conventional portable device in which the NFC antenna is located on the surface opposite to the surface on which the display panel is located, or on the battery, NFC communication with an external device located close to the front surface of the mobile device (the surface on which the display panel is located) This was impossible. In particular, when the wearable electronic device performs NFC communication in the rear direction of the wearable electronic device, the wearable electronic device has an inconvenience in that NFC communication is possible only when the wearable electronic device is removed. However, in the portable device 500 according to an embodiment of the present invention, since the case 540 and the magnetically coupled loop antenna 580 are disposed between the display panel 520 and the main board 530, The loop antenna 580 may radiate a magnetic field in a direction passing through the display panel 520, and the mobile device 500 may perform NFC communication with an external device located in the front direction of the mobile device 500. Accordingly, when the portable device 500 is the wearable electronic device 500, the user may perform NFC communication while wearing the wearable electronic device 500.

In one embodiment, the portable device 500 may further include a magnetic sheet disposed on the rear surface of the roof antenna 580, that is, disposed between the roof antenna 580 and the main board 530. The magnetic sheet prevents attenuation of a magnetic field for NFC communication by generating an eddy current due to a change in a magnetic field in the main board 530, thereby improving the magnetic field radiation efficiency of the loop antenna 580. Meanwhile, according to an embodiment, the magnetic sheet may be a ferrite sheet, a magneto-dielectric material (MDM) sheet, or the like.

9 is a diagram illustrating a portable device according to another embodiment of the present invention, and FIG. 10 is a diagram illustrating a configuration of a portable device according to another embodiment of the present invention.

9 and 10, the portable device 600 includes a display panel 620, a case 640 that supports the display panel 620 and defines an internal space, and the internal space defined by the case 640 The main board 630 located at, a band part 660 configured to be easily worn by a user, and a roof antenna 680 located between the main board 630 and the rear cover part 640b of the case 640 Can include. The portable device 600 of FIGS. 9 and 10 may have a configuration similar to the portable device 500 of FIGS. 7 and 8 except for the location of the loop antenna 680.

The case 640 may have a side edge portion 640a defining a side edge of the portable device 600 and a rear cover portion 640b defining a rear side of the portable device 600. In one embodiment, the side edge portion 640a is formed of a conductive material (eg, a metallic material), and the rear cover portion 640b is formed of a non-conductive material (eg, a non-metallic material or an insulating material). I can. The side edge portion 640a and the rear cover portion 640b may be coupled to each other. First and second terminals spaced apart from each other are formed on the side edge portion 640a of the case 640, and the NFC chip may be connected to at least one of the first and second terminals. On the other hand, the side edge portion 640a of the case 640 may have an integrated structure without a slit, and thus, the waterproof function and design aesthetics of the case 640 or the side edge portion 640a of the case 640 are improved. It can be improved. The NFC chip may apply an electrical signal to the case 640 (or the side edge portion 640a), and the case 640 (or the side edge portion 640a) may emit a first magnetic field.

The roof antenna 680 may be disposed in the case 640 between the main board 630 and the rear cover part 640b of the case 640. The loop antenna 680 may be magnetically coupled to the case 640 to form a second magnetic field in response to the first magnetic field formed in the case 640. Meanwhile, even if the second magnetic field radiated by the roof antenna 680 is shielded by the main board 630, it may pass through the rear cover part 640b formed of a non-conductive material. Therefore, since the roof antenna 680 is disposed between the main board 630 and the rear cover portion 640b of the case 640, the roof antenna 680 passes through the rear cover portion 640b of the case 640. The second magnetic field may be radiated in a direction. Accordingly, the mobile device 600 may perform NFC communication with an external device located in the rear direction of the mobile device 600. In one embodiment, the portable device 600 may further include a magnetic sheet disposed between the main board 630 and the loop antenna 680 on a surface opposite to the direction in which the loop antenna 680 radiates a magnetic field. . The magnetic sheet may improve the magnetic field radiation efficiency of the loop antenna 680.

11 is a diagram illustrating a portable device according to another embodiment of the present invention, and FIG. 12 is a diagram illustrating a configuration of a portable device according to another embodiment of the present invention.

11 and 12, the portable device 700 includes a display panel 720, a case 740 that supports the display panel 720 and defines an internal space, and the internal space defined by the case 740 The main board 730 positioned at, a band portion 760 configured to be easily worn by a user, a first roof antenna 780 positioned between the display panel 720 and the main board 730, and the main board 730 ) And a second loop antenna 785 positioned between the rear cover portion 740b of the case 740. The portable device 700 of FIGS. 11 and 12 is a configuration similar to the portable device 500 of FIGS. 7 and 8 or the portable device 600 of FIGS. 9 and 10 except for the loop antennas 780 and 785. Can have.

The case 740 may have a side edge portion 740a defining a side edge of the portable device 700 and a rear cover portion 740b defining a rear surface of the portable device 700. In one embodiment, the side edge portion 740a is formed of a conductive material (eg, a metallic material), and the rear cover portion 740b is formed of a non-conductive material (eg, a non-metallic material or an insulating material). I can. First and second terminals spaced apart from each other are formed on the side edge portion 740a of the case 740, and the NFC chip may be connected to at least one of the first and second terminals. The NFC chip may apply an electric signal to the case 740 (or the side edge portion 740a), and the case 740 (or the side edge portion 740a) may emit a first magnetic field.

The first loop antenna 780 is disposed between the display panel 720 and the main board 730 in the case 740, and the second roof antenna 785 is disposed in the case 740. It may be disposed between the rear cover portion 740b of the 740. Each of the first loop antenna 780 and the second loop antenna 785 may be magnetically coupled to the case 740 to form a second magnetic field in response to the first magnetic field formed in the case 740. Meanwhile, the second magnetic field radiated by the first loop antenna 780 may pass through the display panel 720, and the second magnetic field radiated by the second loop antenna 785 is the rear cover part 740b. ) Can pass. Accordingly, the first loop antenna 780 can radiate the second magnetic field in a direction passing through the display panel 720, and the second loop antenna 785 covers the rear cover portion 740b of the case 740. The second magnetic field may be radiated in a passing direction. Accordingly, the portable device 700 may perform NFC communication with an external device at an arbitrary location. In one embodiment, the portable device 700 includes a magnetic sheet positioned between the first loop antenna 780 and the main board 730, and/or a magnetic sheet positioned between the main board 730 and the second loop antenna 785. It may further include a sheet.

13A is a view for explaining the configuration of a portable device according to another embodiment of the present invention, and FIG. 13B is a diagram for explaining a connection relationship between a case, a loop coil, and a near field communication (NFC) chip to be.

13A and 13B, the portable device 800 may further include a loop coil 830 disposed to surround the loop antenna 880 compared to the portable device 200 illustrated in FIG. 2. .

The case 840 may have first and second terminals T1 and T2 spaced apart from each other, and the NFC chip 870 may be connected to the first and second terminals T1 and T2 of the case 840. I can. The NFC chip 870 may apply an electric signal to the first and second terminals T1 and T2 of the case 840, and the electric signal (eg, current) is the first and second terminals. It may flow through the current path 850 of the case 840 between (T1, T2). Accordingly, the case 840 may radiate the first magnetic field.

The loop coil 830 may be connected to the NFC chip 870 in parallel with the case 840. For example, one end (E3) of the loop coil 830 is connected to the terminal of the NFC chip 870 to which the first terminal (T1) of the case 840 is connected, and the other end (E4) of the loop coil 830 ) May be connected to a terminal of the NFC chip 870 to which the second terminal T2 of the case 840 is connected. Accordingly, the loop coil 830 may receive the electric signal supplied from the NFC chip 870 and further emit the first magnetic field based on the electric signal. Accordingly, the first magnetic field provided to the loop antenna 880 may be amplified. Current may flow from the loop antenna 880 along the current path 890 in response to the first magnetic field radiated by the case 840 and the loop coil 830, and accordingly, the loop antenna 880 It can radiate a magnetic field.

As described above, in the portable device 800 according to an embodiment of the present invention, a loop coil 830 connected to the NFC chip 870 in parallel with the case 840 and disposed to surround the loop antenna 880 ), the first magnetic field may be efficiently transmitted to the loop antenna 880. Accordingly, even if the distance between the case 840 and the loop antenna 880 is far apart, or the magnetic field radiation efficiency of the case 840 is low, the first magnetic field can be efficiently transmitted to the loop antenna 880, and , The mobile device 800 may accurately perform NFC communication.

14 is a diagram illustrating an example of a connection relationship between an NFC chip, a matching circuit, a case, and a loop antenna in a portable device according to embodiments of the present invention.

Referring to FIG. 14, a portable device 900 according to embodiments of the present invention includes a display panel, a case 950 supporting the display panel, and having first and second terminals T1 and T2 spaced apart from each other. ), and a loop antenna 970 positioned in the case 950 to be spaced apart from the case 950 and magnetically coupled to the case 950. In addition, the NFC chip 910 may be embedded in the portable device 900.

The NFC chip 910 may include an NFC controller 912 that provides an electrical signal to the case 950 to perform NFC communication. The NFC controller 912 is connected to at least one of the first and second terminals T1 and T2 of the case 950 and may supply an electric signal to the case 950. Accordingly, the case 950 may radiate a first magnetic field based on the electric signal, and the loop antenna 970 magnetically coupled to the case 950 may generate a second magnetic field in response to the first magnetic field. Can be formed. In one embodiment, the NFC chip 910 may operate in an NFC card mode. The NFC controller 912 may perform a transmission operation (and/or a reception operation) through the first transmission terminal TX1 and the second transmission terminal TX2 of the NFC chip 910 in the NFC card mode. . In another embodiment, the NFC chip 910 may operate in an NFC reader mode, and may have terminals for transmitting and receiving electrical signals in the NFC reader mode. In one embodiment, the NFC chip 910 is connected to the NFC controller 912, a secure storage device 914 for storing information transmitted to an external device through NFC communication using the first and second magnetic fields. It may contain more. For example, the secure storage device 914 may store payment information (eg, credit card information), an encryption key, and the like. Also, for example, the secure storage device 914 may be an embedded secure element (eSE). In addition, in an embodiment, the NFC controller 912 and the secure storage device 914 may be packaged as a single chip 910 in a SIP (System In Package) method.

In one embodiment, the case 950 may be a metal case formed of a metal material. The case 950 may have first and second terminals T1 and T2 spaced apart from each other. Further, the case 950 is an equivalent circuit and may be expressed as an inductor L1.

In one embodiment, the matching circuit 930 may be connected between the NFC chip 910 and the case 950 of the portable device 900. The matching circuit 930 may perform impedance matching between the NFC chip 910 and the case 950. For example, the matching circuit 930 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first inductor I1, and a second inductor. I2) may be included. The first capacitor C1 may be connected between the terminals T1 and T2 of the case 950. The first capacitor C1 is connected to the case 950 represented by the inductor L1, and the resonant frequency of the case 950 can be adjusted to a desired frequency (eg, about 13.56 MHz). The second capacitor C2 may be connected between the first terminal T1 of the case 950 and the first node, and the third capacitor C3 is the second terminal T2 and the second node of the case 950 The fourth capacitor C4 may be connected between the first node and the second node. The first inductor I1 is connected between the first node and the first transmission terminal TX1 of the NFC chip 910, and the second inductor I2 is connected to the second node and the second It may be connected between the transmission terminals TX2. However, the configuration of the matching circuit 930 is only an example, and the matching circuit 930 may be implemented in various configurations for impedance matching between the NFC chip 910 and the case 950.

In one embodiment, the NFC chip 910 (or the NFC controller 912) outputs a differential electrical signal through the first and second transmission terminals TX1 and TX2, and the first and the first of the case 950 The two terminals T1 and T2 may receive the differential electric signal through the matching circuit 930. The case 950 may emit a first magnetic field based on the differential electric signal. Meanwhile, the loop antenna 970 disposed in the case 950 may be magnetically coupled to the case 950, and may be expressed as an inductor L2 and a capacitor C connected to each other as an equivalent circuit. Since the loop antenna 970 is magnetically coupled to the case 950, the loop antenna 970 may form a second magnetic field in response to the first magnetic field radiated from the case 950. Accordingly, the magnetic field radiation efficiency of the portable device 900 can be improved, and the portable device 900 can accurately perform NFC communication.

15 is a diagram illustrating another example of a connection relationship between an NFC chip, a matching circuit, a case, and a loop antenna in a portable device according to embodiments of the present invention.

Referring to FIG. 15, in the portable device 900a, a matching circuit 930a may be connected between the NFC chip 910a and the case 950 of the portable device 900a. The matching circuit 930a includes a first capacitor C1 connected between the first and second terminals T1 and T2 of the case 950, and between the first terminal T1 and the first node of the case 950. A connected second capacitor C2, a fourth capacitor C4 connected between the first node and a ground voltage, and a first node connected between the first node and at least one transmission terminal TX of the NFC chip 910a It may include an inductor I1. The portable device 900a is the portable device of FIG. 14 except that the NFC chip 910a outputs a single-ended electrical signal and the case 950 receives the single-ended electrical signal. It may have a configuration similar to 900.

The NFC chip 910a outputs a single-ended electrical signal through at least one transmission terminal TX, and one of the first and second terminals T1 and T2 of the case 950 is The single-ended electrical signal may be received through the matching circuit 930a. The other one of the first and second terminals T1 and T2 of the case 950 may be grounded. The case 950 may radiate a first magnetic field based on the single-ended electrical signal. Meanwhile, the loop antenna 970 disposed in the case 950 may be magnetically coupled to the case 950, and may form a second magnetic field in response to the first magnetic field radiated from the case 950. have.

16 is a view for explaining another example of a connection relationship between an NFC chip, a matching circuit, a case, and a loop antenna in a portable device according to embodiments of the present invention.

Referring to FIG. 16, a portable device 900b according to embodiments of the present invention includes a display panel, an NFC chip 910b that outputs a differential electric signal, a matching circuit 930b connected to the NFC chip 910b, and the display. A case 950 that supports the panel and is connected to the matching circuit 930b, and a loop antenna 970 positioned in the case 950 to be spaced apart from the case 950 may be included. The case 950 may include a conductive material. For example, the case 950 may be a metal case including a metal material. In addition, the case 950 may have a first terminal T1 connected to the matching circuit 930b and a second terminal T2 spaced apart from the first terminal T1 and connected to a ground voltage.

The matching circuit 930b may be connected between the NFC chip 910b and the case 950 of the portable device 900b, and may perform impedance matching between the NFC chip 910b and the case 950. In addition, the matching circuit 930b may receive the differential electrical signal from the NFC chip 910b, convert the differential electrical signal into a single-ended electrical signal, and transmit the single-ended electrical signal to the case 950. have. In one embodiment, to convert the differential electrical signal into the single-ended electrical signal, the matching circuit 930b is connected to the first and second transmission terminals TX1 and TX2 of the NFC chip 910b, respectively. Having first and second input terminals IN1 and IN2, a first output terminal OUT1 connected to the first terminal T1 of the case 950, and a second output terminal OUT2 connected to the ground voltage, A transformer 940 for converting the differential electrical signal into the single-ended electrical signal may be included. For example, the transformer 940 may be a balun (balanced-to-unbalanced) circuit or a balun transformer.

In one embodiment, the matching circuit 930b includes a first capacitor C1 connected between the first terminal T1 of the case 950 and the ground voltage, the first terminal T1 of the case 950, and a transformer ( A second capacitor C2 connected between the first output terminal OUT1 of the 940, a fourth capacitor C4 connected between the first and second input terminals IN1 and IN2 of the transformer 940, and a transformer ( The first inductor I1 connected between the first input terminal IN1 of the 940 and the first transmission terminal TX1 of the NFC chip 910b, the second input terminal IN2 of the transformer 940 and the NFC chip ( A second inductor I2 connected between the second transmission terminal TX2 of 910b) may be further included. Meanwhile, the configurations of the capacitors C1, C2, and C4 included in the matching circuit 930b and the inductors I1 and I2 may be variously modified or changed according to exemplary embodiments.

The NFC chip 910b outputs the differential electrical signal through the first and second transmission terminals TX1 and TX2, and the differential electrical signal can be converted into the single-ended electrical signal by the transformer 940. have. One of the first and second terminals T1 and T2 of the case 950 (eg, the first terminal T1) may receive the single-ended electrical signal from the transformer 940. The other of the first and second terminals T1 and T2 of the case 950 (eg, the second terminal T2) may be grounded. The case 950 may radiate a first magnetic field in response to the single-ended electrical signal. Meanwhile, the loop antenna 970 disposed in the case 950 may be magnetically coupled to the case 950, and may form a second magnetic field in response to the first magnetic field radiated from the case 950. have.

As described above, in the portable device 900b according to the embodiments of the present invention, the differential electric signal output from the NFC chip 910b is applied to the single-ended electric signal by the matching circuit 930b or the transformer 940. It may be converted into a signal and applied to the case 950. Accordingly, when the NFC chip 910b outputs the differential electric signal, but it is not easy for the matching circuit 930b to be connected to the two terminals T1 and T2 of the case 950, or the case 950 Even when it is not easy to form two feeding points in ), the first magnetic field may be radiated using the case 950. In addition, since the loop antenna 970 magnetically coupled to the case 950 radiates the second magnetic field in response to the first magnetic field, the magnetic field radiation efficiency of the portable device 900b may be further improved.

17 is a diagram for describing a portable device further including an inductor between a matching circuit and a case according to embodiments of the present invention.

Referring to FIG. 17, in the mobile device 1000, a matching circuit 1030 is connected between the NFC chip 1010 and the case 1050 of the mobile device 1000, and at least one inductor 1040 is a matching circuit. It may be connected between the 1030 and at least one terminal of the case 1050. The case 1050 radiates a first magnetic field MF1, and the loop antenna 1070 magnetically coupled to the case 1050 radiates a second magnetic field MF2 in response to the first magnetic field MF1. I can. The portable device 1000 may further include at least one inductor 1040 compared to the portable device 900 of FIG. 14.

The inductor 1040 may be disposed in a current loop formed by the case 1050 and the first capacitor C1 of FIG. 14, and a frequency different from the operating frequency of NFC (eg, about 13.56 MHz) in the current loop. By blocking the signal component of (for example, high frequency), NFC communication uses the case 1050 as an antenna, and other wireless communication (for example, LTE (Long Term Evolution) communication, WCDMA (Wideband Code Division Multiple Access) communication) Cellular telephone communication, such as cellular telephone communication, wireless local area network (WLAN) communication, global positioning system (GPS) communication, Bluetooth communication, or similar communication) can be prevented from interfering.

18 is a diagram for describing a portable device further including a low pass filter between a matching circuit and a case according to example embodiments.

Referring to FIG. 18, in the mobile device 1100, a matching circuit 1140 is connected between the NFC chip 1110 and the case 1150 of the mobile device 1100, and at least one low pass filter 1140 is It may be connected between the matching circuit 1130 and at least one terminal of the case 1150. The case 1150 radiates a first magnetic field MF1, and the loop antenna 1170 magnetically coupled with the case 1150 radiates a second magnetic field MF2 in response to the first magnetic field MF1. I can. Compared to the portable device 1000 of FIG. 13, the portable device 1100 may include a low pass filter 1140 in place of the inductor 1040.

The low pass filter 1140 may be disposed in a current loop formed by the case 1150 and the first capacitor C1 of FIG. 14, and the operating frequency of NFC (for example, about 13.56 MHz) in the current loop By blocking signal components of other frequencies (eg, high frequency), NFC communication can be prevented from interfering with other wireless communication using the case 1050 as an antenna. For example, the low pass filter 1140 may include an inductor 1142 and a capacitor 1144.

FIG. 19 is a diagram for describing a portable device that performs NFC communication, wireless charging, and/or magnetic secure transmission according to embodiments of the present invention.

Referring to FIG. 19, a mobile device according to embodiments of the present invention includes an NFC chip 1210, a case connected to the NFC chip 1210 (in one embodiment, a metal case) 1230, and a case 1230. A magnetically coupled loop antenna 1250 may be included. The NFC chip 1210 may perform NFC communication using the case 1230 and the loop antenna 1250.

In one embodiment, the portable device may further include a wireless charging circuit 1270 connected to the loop antenna 1250. The wireless charging circuit 1270 may charge power for the portable device by receiving power wirelessly through the loop antenna 1250. Accordingly, the loop antenna 1250 may be used not only to perform NFC communication, but also as a loop antenna for wireless charging.

In an embodiment, the portable device may further include a magnetic secure transmission (MST) circuit 1290 connected to the loop antenna 1250. The MST circuit 1290 may perform magnetic security transmission through the loop antenna 1250. Accordingly, the loop antenna 1250 may be used not only to perform NFC communication, but also as a loop antenna for magnetic security transmission.

20 is a diagram illustrating an example in which a mobile device performs NFC communication according to embodiments of the present invention.

Referring to FIG. 20, in the portable device 1300, a case 1340 defining an inner space 1360 and a loop antenna 1380 disposed in the inner space 1360 may be connected in series. For example, the first terminal T1 of the case 1340 and the first end E1 of the loop antenna 1380 (or loop coil) may be connected, and the NFC chip 1390 is the first terminal T1 of the case 1340. The second terminal T2 may be connected to the second terminal E2 of the loop antenna 1380. That is, in the NFC antenna including the case 1340 and the loop antenna 1380, the second terminal T2 of the case 1340 and the second end E2 of the loop antenna 1380 are feeding points. Can play a role as a field. The NFC chip 1390 may perform NFC communication using the case 1340 and the loop antenna 1380 connected in series with each other. Meanwhile, the case 1340 may have an integrated structure without a slit, and the waterproof function and design aesthetics of the case 1340 may be improved.

21 is a diagram for explaining an example in which a mobile device performs NFC communication according to embodiments of the present invention, and FIG. 22 is a diagram illustrating another example in which a mobile device performs NFC communication according to embodiments of the present invention. It is a drawing for explanation.

As shown in FIG. 21, the portable device 1410 according to embodiments of the present invention may be a wearable electronic device 1410 such as a wrist-worn electronic device. The wearable electronic device 1410 may perform pairing or data transmission with the external device 1430 through NFC communication while being worn on the human body. For example, the wearable electronic device 1410 may perform pairing with the external device 1430 for other predetermined wireless communication (eg, Bluetooth or Wi-Fi). Through the pairing, the wearable electronic device 1410 and the external device 1430 may be paired or bonded by sharing a shared key (or a link key). In addition, according to an embodiment, the wearable electronic device 1410 and the external device 1430 perform data transmission through the NFC communication, or some other wireless communication paired by the NFC communication (for example, Bluetooth or Data transmission can be performed through Wi-Fi).

In addition, as shown in FIG. 22, the wearable electronic device 1510 according to the embodiments of the present invention transmits payment information (eg, credit card information) to a payment terminal through NFC communication while being worn on the human body. By transmitting to 1530, electronic payment can be performed.

As described above, the mobile devices 1410 and 1510 according to the embodiments of the present invention perform NFC communication using the cases of the mobile devices 1410 and 1510 and a loop antenna magnetically coupled to the case. I can. In the portable devices 1410 and 1510 according to the embodiments of the present invention, a slit may not be formed in the case, and thus the waterproof function and design aesthetics of the case may be improved. In one embodiment, the portable devices 1410 and 1510 may be wearable electronic devices 1410 and 1510, and the wearable electronic devices 1410 and 1510 are worn on the human body and are worn on the human body through NFC communication for pairing, electronic payment, and data. Transfer, etc. can be performed.

The present invention can be applied to any portable device such as a smart phone or a tablet PC. In addition, the present invention can be applied to any wearable electronic device such as a smart watch, a wrist band electronic device, a necklace type electronic device, a glasses type electronic device, and the like.

Although described above with reference to embodiments of the present invention, those of ordinary skill in the art will variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the following claims. You will understand that you can do it.

100: mobile device
120: display panel
140, 240: case
910: NFC chip
280: loop antenna

Claims (20)

Display panel;
A case supporting the display panel, including a conductive material, and having first and second terminals spaced apart from each other;
A near field communication (NFC) chip connected to at least one of the first and second terminals of the case and supplying an electric signal to the case so that the case radiates a first magnetic field;
A loop antenna located in the case and spaced apart from the case, magnetically coupled to the case to form a second magnetic field in response to the first magnetic field formed in the case; And
It is connected to the NFC chip in parallel with the case, is physically not connected to the loop antenna, is disposed to surround the loop antenna, and additionally radiates the first magnetic field based on the electric signal supplied from the NFC chip. A portable device including a first loop coil. The portable device of claim 1, wherein a side edge portion of the case has an integrated structure without a slit. The portable device of claim 1, wherein the first and second terminals of the case are spaced apart from each other so that the loop antenna is disposed between the first and second terminals. The portable device of claim 1, wherein the case is a metal case containing a metal material. The portable device of claim 1, wherein the loop antenna is physically disconnected from the NFC chip. The method of claim 1, wherein the loop antenna
A second loop coil positioned in the case to be spaced apart from the case, formed of a metal material, and having a first end and a second end; And
A portable device comprising a capacitor connected between the first end and the second end of the second loop coil. The portable device of claim 6, wherein the capacitor is a chip capacitor. The portable device of claim 6, wherein the capacitor is formed by metal patterns extending from the first end and the second end of the second loop coil. The method of claim 1,
Further comprising a main board located in the case and on which a processor for controlling an operation of the portable device is disposed,
The roof antenna is a portable device positioned between the display panel and the main board. The portable device of claim 9, wherein the loop antenna radiates the second magnetic field in a direction passing through the display panel. The method of claim 9,
A portable device further comprising a magnetic sheet disposed between the roof antenna and the main board. The method of claim 1,
Further comprising a main board located in the case and on which a processor for controlling an operation of the portable device is disposed,
The case includes a side edge portion formed of the conductive material, and a rear cover portion formed of a non-conductive material,
The roof antenna is a portable device positioned between the main board and the rear cover part of the case. The portable device of claim 12, wherein the loop antenna radiates the second magnetic field in a direction passing through the rear cover part of the case. The method of claim 1,
Further comprising a main board located in the case and on which a processor for controlling an operation of the portable device is disposed,
The case includes a side edge portion formed of the conductive material, and a rear cover portion formed of a non-conductive material,
The roof antenna includes a first loop antenna disposed between the display panel and the main board, and a second roof antenna disposed between the main board and the rear cover portion of the case. The method of claim 14, wherein the first loop antenna radiates the second magnetic field in a direction passing through the display panel,
The second roof antenna radiates the second magnetic field in a direction passing through the rear cover part of the case. delete The method of claim 1,
The portable device further comprises a matching circuit connected between the NFC chip and the case and performing impedance matching between the NFC chip and the case. The method of claim 17,
A portable device further comprising an inductor or a low pass filter connected between the matching circuit and the case. Display panel;
Near Field Communication (NFC) chip for outputting a differential electrical signal;
A matching circuit connected to the NFC chip, converting the differential electrical signal received from the NFC chip into a single-ended electrical signal, and performing impedance matching;
The single end, which supports the display panel, includes a conductive material, has a first terminal connected to the matching circuit, and a second terminal spaced apart from the first terminal and connected to a ground voltage, and received from the matching circuit A case radiating a first magnetic field in response to a type electrical signal;
A loop antenna located in the case and spaced apart from the case, magnetically coupled to the case to form a second magnetic field in response to the first magnetic field formed in the case; And
It is connected to the NFC chip in parallel with the case, is physically not connected to the loop antenna, is disposed to surround the loop antenna, and additionally radiates the first magnetic field based on the electric signal supplied from the NFC chip. A portable device that includes a loop coil. A portable device including a display panel, a case supporting the display panel and having first and second terminals spaced apart from each other, and a loop antenna located in the case and spaced apart from the case and magnetically coupled to the case In the near field communication (NFC) chip embedded in the,
An electrical signal to the case such that the case is connected to at least one of the first and second terminals of the case, the case radiates a first magnetic field, and the loop antenna forms a second magnetic field in response to the first magnetic field Including an NFC controller to supply,
The portable device is connected to the NFC chip in parallel with the case, is physically not connected to the loop antenna, is disposed to surround the loop antenna, and based on the electric signal supplied from the NFC chip, the first Further comprising a loop coil that additionally radiates a magnetic field,
The NFC controller is an NFC chip that supplies the electrical signal to the loop coil.

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