KR102535513B1 - Display apparatus - Google Patents

Abstract

A display device is disclosed. The display device of the present invention includes a body and a housing having a wireless power transmission unit that is spaced apart from the display unit and transmits power to the display unit, and the body receives power from a display area where a screen is displayed and the transmission coil. A circuit area having a wireless power receiving unit that receives power and transmits power so that a screen is displayed on the display unit, wherein the wireless power transmitting unit includes a transmitting coil, the wireless power receiving unit includes a receiving coil, and the wireless power receiving unit includes a receiving coil. The width of the coil is different from that of the transmitting coil. According to the present invention, since the width of the receiving coil is smaller than the width of the transmitting coil, the area of the circuit area of the body is reduced, so that the user can concentrate more on the screen displayed on the display area.

Description

Display device {DISPLAY APPARATUS}

The present invention relates to a display device, and more particularly, to a display device in which the area of a circuit area of a body is reduced because the width of a receiving coil is smaller than that of a transmitting coil so that a user can concentrate more on a screen displayed on the display area. it's about

As the information society develops, the demand for display devices is also increasing in various forms. Display) has been studied and used for various display devices.

Among them, display devices using organic light emitting diodes (OLEDs) have superior luminance characteristics and viewing angle characteristics compared to liquid crystal display devices, and do not require a backlight unit, so they can be implemented in an ultra-thin type.

The present invention aims to solve the foregoing and other problems. Another object is to provide a display device in which the area of the circuit area of the body is reduced so that the user can focus more on the screen displayed on the display area.

According to one aspect of the present invention in order to achieve the above or other object, it includes a body and a housing having a wireless power transmission unit spaced apart from the display unit and transmitting power to the display unit, wherein the body is a display on which a screen is displayed. and a circuit area having a wireless power receiver that receives power from the transmission coil and transmits the power so that a screen is displayed on the display unit, wherein the wireless power transmitter includes a transmission coil, and the wireless power receiver includes a receiving coil, and the width of the receiving coil is different from that of the transmitting coil.

The transmitting coil and the receiving coil include a cylindrical core containing a magnetic material, a bobbin surrounding the core, and a wire spirally wound on the bobbin a plurality of times, and the bobbin is a portion corresponding to the wire It may include a groove recessed inward.

The grooves may be uniformly formed in a spiral shape on the bobbin.

The groove may include first and second grooves spirally wound in opposite directions on the bobbin.

The first groove is recessed into the bobbin by a first width, the second groove is recessed into the bobbin by a second width, and the first width may be different from the second width.

The wireless power transmission unit further includes a low power transmission unit electrically connected to the transmission coil and transmitting low power to the transmission coil, and a main power transmission unit electrically connected to the transmission coil and transmitting main power to the transmission coil, The low-power transmitter may include a first wireless communication unit for transmitting a communication signal to the wireless power receiver.

The first wireless communication unit may transmit a communication signal using at least one of NFC, Bluetooth, Wi-Fi, and UWB.

When the display device is turned on, power is first transferred to the low power transmitter, and after a communication signal is exchanged between the wireless power transmitter and the wireless power receiver, power can be transmitted to the main power transmitter.

The transmission coil may include a first transmission coil connected to the low power transmission unit and a second transmission coil spaced apart from the first transmission coil and connected to the main power transmission unit.

Effects of the display device according to the present invention are described as follows.

According to at least one of the embodiments of the present invention, since the width of the receiving coil is smaller than that of the transmitting coil, the area of the circuit area of the body is reduced, so that the user can focus more on the screen displayed on the display area.

A further scope of the applicability of the present invention will become apparent from the detailed description that follows. However, since various changes and modifications within the spirit and scope of the present invention can be clearly understood by those skilled in the art, it should be understood that the detailed description and specific examples such as preferred embodiments of the present invention are given as examples only.

1 to 6 are diagrams showing the configuration of a display device related to the present invention.
7 to 10 are diagrams illustrating a receiving coil of a display device.
11 and 12 are block diagrams illustrating a wireless power transmitter and a wireless power receiver according to the present invention.
13 to 15 are block diagrams sequentially illustrating operations of a wireless power transmitter and a wireless power receiver according to the operation of the display device.
16 is a diagram illustrating an embodiment of a method of transmitting low power power and main power power.
17 is a diagram illustrating another embodiment of a method of transmitting low power power and main power power.
18 is a diagram illustrating another embodiment of a method of transmitting low power power and main power power.

Hereinafter, the embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings, but the same or similar elements are given the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "unit" for components used in the following description are given or used together in consideration of ease of writing the specification, and do not have meanings or roles that are distinct from each other by themselves. In addition, in describing the embodiments disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the embodiment disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in this specification, the technical idea disclosed in this specification is not limited by the accompanying drawings, and all changes included in the spirit and technical scope of the present invention , it should be understood to include equivalents or substitutes.

Hereinafter, an organic light emitting display (OLED) will be described as an example of a display panel, but a display panel applicable to the present invention is not limited to an organic display panel, and a liquid crystal panel (liquid crystal display) Device, LCD), plasma display panel (P), field emission display panel (Field Emission Display, FED).

1 to 6 are diagrams showing the configuration of a display device related to the present invention.

As shown in FIG. 1, the display panel 100 below has a first long side (LS1), a second long side (LS2) opposite to the first long side (LS1), and a first long side. It may include a first short side (SS1) adjacent to (LS1) and the second long side (LS2) and a second short side (SS2) opposite to the first short side (SS1).

Here, the first short side area SS1 is referred to as a first side area, and the second short side area SS2 is referred to as a second side area opposing the first side area. One long side area LS1 is referred to as a third side area adjacent to the first side area and the second side area and located between the first side area and the second side area, and the second long side area ( LS2) may be referred to as a fourth side area adjacent to the first side area and the second side area, located between the first side area and the second side area, and opposite to the third side area. .

In addition, although the lengths of the first and second long sides LS1 and LS2 are shown and described as being longer than the lengths of the first and second short sides SS1 and SS2 for convenience of description, the first and second long sides LS1, A case in which the length of LS2 is substantially equal to the lengths of the first and second short sides SS1 and SS2 may also be possible.

In addition, in the following, the first direction (First Direction, DR1) is a direction parallel to the long side (Long Side, LS1, LS2) of the display panel 100, and the second direction (DR2) is the direction of the display panel 100. It may be in a direction parallel to the short side (Short Side, SS1, SS2).

The third direction (DR3) may be a direction perpendicular to the first direction (DR1) and/or the second direction (DR2).

The first direction DR1 and the second direction DR2 may be collectively referred to as a horizontal direction. In addition, the third direction DR3 may be referred to as a vertical direction.

From another point of view, the side on which the display device 10 displays an image may be referred to as the front or front side. When the display device 10 displays an image, the side on which the image cannot be observed may be referred to as the rear or rear side. When viewing the display device 10 from the front or front side, the side of the first long side LS1 may be referred to as an upper side or an upper surface. Similarly, the side of the second long side LS2 may be referred to as a lower side or a lower side. Similarly, the side of the first short side SS1 may be referred to as the left or left side, and the side of the second short side SS2 may be referred to as the right or right side.

In addition, the first long side LS1 , the second long side LS2 , the first short side SS1 , and the second short side SS2 may be referred to as edges of the display device 10 . Also, a point where the first long side LS1 , the second long side LS2 , the first short side SS1 , and the second short side SS2 meet each other may be referred to as a corner. For example, the point where the first long side LS1 and the first short side SS1 meet is the first corner C1, and the point where the first long side LS1 and the second short side SS2 meet is the second corner C2. ), the point where the second short side SS2 and the second long side LS2 meet is the third corner C3, and the point where the second long side LS2 and the first short side SS1 meet is the fourth corner C4. can be

Here, a direction from the first short side SS1 to the second short side SS1 or a direction from the second short side SS2 to the first short side SS1 may be referred to as a left-right direction LR. A direction from the first long side LS1 to the second long side LS2 or from the second long side LS2 to the first long side LS1 may be referred to as a vertical direction UD.

Referring to FIG. 2 , the body 10 of the display device according to the present invention may include a display panel 100 , a module cover 200 and a PCB cover 400 .

The display panel 100 is provided on the front of the body 10 and can display images. The display panel 100 may output an image by dividing an image into a plurality of pixels and controlling each pixel to emit light according to color, brightness, and saturation.

The display panel 100 may have a rectangular shape. However, it is not limited thereto, and the display panel 100 may have a shape having a predetermined curvature at a corner. The display panel 100 may be an organic light emitting diode (OLED) panel. However, it is not limited thereto, and the display panel 100 may be a liquid crystal display panel.

The module cover 200 may be provided on the rear surface of the display panel 100 . The module cover 200 may be directly attached to the display panel 100 . The module cover 200 may support the rear surface of the display panel 100 . That is, the module cover 200 means that the rigidity of the display panel 100 can be reinforced. Accordingly, the module cover 200 may include a material that is lightweight and has high strength. For example, the module cover 200 may include aluminum.

A source PCB 172 may be attached to a lower area of the module cover 200 . A hole may be formed in the area where the source PCB 172 is located in the module cover 200 to secure an area where the source PCB 172 is located. If too many through-holes or holes are formed in the module cover 200, cracks may be formed in the module cover 200 or rigidity may be weakened. Accordingly, it is preferable that the module cover 200 has fewer through holes or holes.

The source PCB 172 may include signal wires for transmitting digital video data and timing control signals transmitted from the timing controller board. The source PCB 171 may be connected to the display panel 100 by a source COF (Chip On Film).

The source COF may be electrically connected to data pads of the source PCB 172 and the display panel 100 . The source COF may be equipped with a data integrated circuit.

The PCB cover 400 may be provided on the rear side of the area where the source PCB 172 is located. The PCB cover 400 may prevent the source PCB 172 from being exposed to the outside. Otherwise, the PCB cover 400 may be opaque so that the source PCB 172 is not exposed to the outside.

The PCB cover 400 may include an insulating material so that the source PCB 172 is not interfered with by other electronic devices. For example, the PCB cover 400 may include a plastic material. Accordingly, the PCB cover 400 may protect the source PCB 172 from leakage current.

The body 10 of the display device according to the present invention can support the display panel 100 only with the module cover 200 . That is, other covers other than the module cover 200 may not be located in the body 10 . Accordingly, the user can feel that the thickness of the body 10 has become very thin, and can focus more on the display screen.

Referring to FIG. 3 , the display panel 100 may include a transparent substrate 110 , an upper electrode 120 , an organic emission layer 130 and a lower electrode 140 . The transparent substrate 110 , the upper electrode 120 , the organic emission layer 130 and the lower electrode 140 may be sequentially formed.

The transparent substrate 110 and the upper electrode 120 may include a transparent material. The lower electrode 140 may include a non-transparent material. However, it is not limited thereto, and the lower electrode 140 may include a transparent material (eg, ITO, etc.). In this case, light may be emitted to one side of the lower electrode 140 .

When a voltage is applied to the upper and lower electrodes 120 and 140 , light emitted from the organic light emitting layer 130 may pass through the upper electrode 120 and the transparent substrate 110 and be emitted to the outside. In this case, a light shielding plate may be further formed behind the lower electrode 140 to emit light emitted from the lower electrode 140 to the front side.

The display device 100 according to the present invention may be an OLED display device. Accordingly, a separate light source is not required, and the volume and weight of the display device 100 can be reduced. In addition, since the response speed of an OLED display device is 1000 times faster than that of a liquid crystal display device, there may be no afterimage left when displaying an image.

Referring to FIG. 4 , in the display device according to the present invention, the display panel 100 and the back cover 200 may be attached through an adhesive sheet 350 . The adhesive sheet 350 may include a double-sided tape capable of bonding both sides.

The adhesive sheet 350 may have a separate thickness. Accordingly, foreign substances or dust may enter between the display panel 100 and the back cover 200 . To prevent this, as shown in (a) of FIG. 4 , at least one side of the adhesive sheet 350 may be side-sealed with the sealing member 183 . The sealing member 183 may simultaneously shield the adhesive sheet 350 and at least one side of the display panel 100 .

As another example, as shown in (b) of FIG. 4 , a frame 187 may be inserted into at least one side of the adhesive sheet 350 . The frame 187 may contact at least one side of the adhesive sheet 350 and may be bent such that one end extends toward the display panel 100 . Accordingly, at least one side of the display panel 100 may be simultaneously shielded.

As another example, as shown in (c) of FIG. 4 , a middle cabinet 193 may be positioned between the display panel 100 and the back cover 200 . The middle cabinet 193 may guide a position where the display panel 100 is coupled. In the middle cabinet 193 , the flange 193a may be inserted between the display panel 100 and the back cover 200 . The body of the middle cabinet 193 may simultaneously shield at least one side of the display panel 100 and the back cover 200 .

The flange 193a of the middle cabinet 193 may be spaced apart from the adhesive sheet 350 . Accordingly, since the adhesive sheet 350 does not have to be positioned entirely on the display panel 100, the amount of the adhesive sheet 350 required when manufacturing the display device can be reduced.

As another example, as shown in (d) of FIG. 4 , an edge portion of the back cover 200 may be bent toward the display panel 100 . Since the edge portion of the back cover 200 is bent, at least one side of the adhesive sheet 350 may be shielded from the outside.

In this case, other materials may not be included between the display panel 100 and the back cover 200 . Accordingly, the manufacturing process of the display device can be simplified and costs can be saved. In addition, the edge of the back cover 200 may be spaced apart from the adhesive sheet 350 . Accordingly, since the adhesive sheet 350 does not have to be positioned entirely on the display panel 100, the amount of the adhesive sheet 350 required when manufacturing the display device can be reduced.

In embodiments to be described later, structures located on the side of the adhesive sheet 350 are omitted for convenience of description. Structures located on the side of the adhesive sheet 350 are also applicable to other embodiments.

Referring to FIG. 5 , in the display device according to the present invention, speakers 117 may be positioned on both sides of the front surface of the housing 500 . The speaker 117 may output and transmit sound to the user. Accordingly, it may be more efficient for the speaker 117 to be located in front of the housing 500 .

As shown in (a) of FIG. 5 , the speaker 117 may be mounted on the front side of the housing 500 while being spaced apart from at least one PCB mounted inside the housing 500 . Alternatively, as shown in (b) of FIG. 5 , the speaker 117 may be spaced apart from the outside of the housing 500 . Since the speaker 117 is located outside the housing 500, the user can position the speaker 117 at a position where sound can be well transmitted to the user. Speakers 117 may be located on both sides of the display device body 10 .

In the display device according to the present invention, the speaker 117 may be located on the front side of the housing 500 or on both sides of the exterior. Accordingly, the user can better receive the sound of the display device.

Referring to FIG. 6 , the display device according to the present invention may include a housing 500 electrically connected to the body 10 .

The housing 500 may transmit power and signals to the body 10 . The housing 500 may be spaced apart from the body 10 . That is, the housing 500 may exchange electrical signals with the body 10 wirelessly. In this case, the user may feel that the appearance is cleaner than when the housing 500 and the body 10 are connected through a cable.

The body 10 and the housing 500 may exchange electrical signals through coils. In detail, electrical signals may be exchanged through the transmission coil 371 located inside the housing 500 and the reception coil 471 located inside one end of the body 10 . The receiving coil 471 may be located inside the circuit area RA instead of the display area DA of the body 10 . Accordingly, the receiving coil 471 may not affect the display screen.

The transmitting coil 371 and the receiving coil 471 may be formed by winding a wire around a cylindrical core a plurality of times. However, it is not limited thereto, and the transmitting coil 371 and the receiving coil 471 may have a columnar shape having an angle. The transmitting coil 371 and the receiving coil 471 may extend in the first direction of the display device. The transmitting coil 371 and the receiving coil 471 may be positioned at corresponding portions. That is, the transmitting coil 371 and the receiving coil 471 may be spaced apart and face each other. If the transmitting coil 371 and the receiving coil 471 are not located at corresponding parts, electrical signal exchange becomes difficult and exchange efficiency may decrease. However, it is not limited thereto, and the receiving coil 471 may be located in various parts capable of receiving electrical signals from the transmitting coil 371 .

The width CD1 of the receiving coil 471 in the second direction may be different from the width CD2 of the transmitting coil 371 in the second direction. A width CD1 of the receiving coil 471 in the second direction may be smaller than a width CD2 of the transmitting coil 371 in the second direction. Accordingly, the area of the circuit area RA where the receiving coil 471 is formed is reduced, so that the user can focus more on the screen displayed in the display area DA.

7 to 10 are diagrams illustrating a receiving coil of a display device.

Although these figures show a receiving coil, it is obvious that the transmitting coil also has the same or similar structure.

Referring to FIG. 7 , the receiving coil 471 may include a bobbin 347 and a core 326 .

The bobbin 347 may have a hollow cylindrical shape. The bobbin 347 may include a plastic material. A wire may be wound in one direction multiple times on the bobbin 347 . Depending on the number of times the wire is wound on the bobbin 347, the induced electromotive force obtained by the receiving coil 471 may increase.

The core 326 may have a cylindrical shape. The core 326 may include a magnetic material. For example, core 326 may include ferrite. The diameter of the core 326 may be smaller than the diameter of the bobbin 347 . Accordingly, the core 326 can be easily coupled to the inside of the bobbin 347. The magnetic core 326 may be inserted into the bobbin 347 to increase inductance and induced electromotive force of the receiving coil 471 .

Referring to (a) of FIG. 8, when the wire is not uniformly wound on the bobbin 347, the first magnetic flux Φ1 and the second magnetic flux Φ2 overlap between the wires wound on the bobbin 347. Quantities may vary. Accordingly, magnetic flux can escape between the parts where the wire on the bobbin 347 is wound. Therefore, the sum of the magnetic fluxes (φT1) is reduced, so that the length over which power can be transmitted wirelessly can be very short.

On the other hand, referring to (b) of FIG. 8, when the wire is uniformly wound on the bobbin, the first magnetic flux Φ1 and the second magnetic flux Φ1 overlap each other between the wires wound on the bobbin 347. It can be. Accordingly, magnetic flux may not escape between the parts where the wire on the bobbin 347 is wound. Therefore, the sum of the magnetic fluxes (ΦT2) is large, and the length at which power can be transmitted wirelessly may be longer than when the length is non-uniform.

Referring to FIG. 9 , a groove 245 having a spiral shape may be formed on the bobbin 347 . The groove 245 may be recessed toward the inside of the bobbin 347 by the first thickness PW1. The groove 245 may have a shape that is uniformly wound on the bobbin 347 in a spiral shape. Accordingly, when viewed from one side, the distance PD between adjacent grooves 245 may be constant. At least a portion of the wire may be inserted into the groove 245 located on the bobbin 347 and wound. The groove 245 may guide a position where the wire is wound.

In the display device according to the present invention, the groove 245 may be located on the bobbin 347. Accordingly, the wire can be uniformly wound on the bobbin 347.

Referring to FIG. 10 , first and second grooves 245a and 245b having a spiral shape may be formed on the bobbin 347 . The first groove 245a and the second groove 245b may have shapes that are uniformly wound in opposite directions. For example, the first groove 245a may have a spiral shape in a clockwise direction, and the second groove 245b may have a spiral shape in a counterclockwise direction.

At least a portion of the first groove 245a and the second groove 245b may overlap. Accordingly, the widths PW1 and PW2 of the first and second grooves 245a and 245b may be different from each other. For example, the width PW1 of the first groove may be smaller than the width PW2 of the second groove. A difference between the width of the first groove (PW1) and the width of the second groove (PW2) may be greater than the diameter of the wire. Accordingly, when at least some of the wires are inserted into and wound in the first and second grooves 245a, they may not come into contact with each other.

In the display device according to the present invention, first and second grooves 245a and 245b overlapping each other may be formed on the bobbin 347 . Accordingly, since the number of windings of the wire is increased, a wireless power transmission distance may be longer, and wireless power transmission efficiency may be increased.

11 and 12 are block diagrams illustrating a wireless power transmitter and a wireless power receiver according to the present invention.

Referring to FIG. 11 , a display device according to the present invention may include a wireless power transmitter 310 and a wireless power receiver 410 .

The wireless power transmitter 310 may transmit power to the wireless power receiver 410 in a state in which they do not contact each other. The wireless power transmitter 310 may operate or be charged using power received from the wireless power receiver 410 .

The wireless power transmitter 310 may transmit power to the wireless power receiver 410 through at least one wireless power transmission method. For example, the wireless power transmitter 310 uses an inductive coupling method based on a magnetic induction phenomenon by a wireless power signal and a magnetic resonance coupling method based on an electromagnetic resonance phenomenon by a wireless power signal of a specific frequency. Power may be transmitted to the wireless power receiver 410 through at least one of the methods.

Referring to FIG. 12 , in the display device according to the present invention, the wireless power transmitter 310 may include a transmit power controller 315, a low power transmitter 348, a main power transmitter 351, and a transmit coil 371. there is.

The transmission power control unit 315 may adjust whether or not to transmit power supplied from the outside or the transmission amount of power. In addition, the transmission power controller 315 may determine at least one characteristic of frequency, voltage, and current to be transmitted to the wireless power receiver 410 .

The low power transmission unit 348 may transmit low power to the transmission coil 371 . The low power transmission unit 348 may be electrically connected to the transmission power control unit 315 . The low power transmitter 348 may operate even when the display device is turned off. Accordingly, the wireless power transmitter 310 may operate immediately when the display device is turned on. That is, the wireless power transmitter 310 may be in a standby state.

The low power transmission unit 348 may include a first wireless communication unit 364 . The first wireless communication unit 364 and the second wireless communication unit 464 may transmit communication signals to each other. The first wireless communication unit 364 communicates using at least one of, for example, Near Field Communication (NFC), Bluetooth, Wi-Fi, Zigbee, and Ultra Wide Band (UWB). signal can be transmitted.

The main power transmission unit 351 may transmit high power to the transmission coil 371 . The main power transmission unit 348 may be electrically connected to the transmission power control unit 315 . The main power transmitter 348 may not operate when the display device is turned off. In addition, the main power transmission unit 348 may not operate unless a certain amount of power is transmitted from the transmission power control unit 315 even when the display device is turned on.

The transmission coil 371 may transmit power to the wireless power receiver 410 . The transmission power control unit 371 may change the magnetic field passing through the transmission coil 371 by changing the strength of the current flowing through the wire wound on the bobbin.

The wireless power receiver 410 may include a receive power controller 415 , a low power receiver 448 , a main power receiver 451 , and a receive coil 471 .

The receiving coil 471 may be a part that receives power from the wireless power transmitter 310 . Depending on the change in the magnetic field passing through the transmitting coil 371, the receiving coil 471 may generate an induced electromotive force. The receiving coil 471 may supply power to the low power receiving unit 448 and/or the main power receiving unit 451 using the induced electromotive force.

The low power receiving unit 448 may be a part that receives low power from the receiving coil 471 . The low power receiving unit 448 may be electrically connected to the receiving coil 471 . The low power receiver 448 may operate when low power is transmitted from the wireless power transmitter 310 .

The low power receiver 448 may include a second wireless communication unit 464 . The second wireless communication unit 464 may transfer communication signals to and from the first wireless communication unit 364 . The second wireless communication unit 464 may transmit a communication signal using, for example, at least one of NFC (Near Field Communication), Bluetooth, Wi-Fi, and UWB (Ultra Wide Band). .

The main power receiving unit 451 may be a part that receives high power from the receiving coil 471 . The main power receiving unit 448 may be electrically connected to the receiving coil 471 . The main power receiver 448 may operate when high power is transmitted from the wireless power transmitter 310 . For example, the main power receiving unit 451 has a relay switch located at a portion connected to the receiving coil 471 so that power can be transmitted toward the main power receiving unit 451 only when more than a certain amount of power is transmitted.

The reception power controller 415 may be a part instructing the wireless power transmitter 310 to convert or terminate wireless power transmission. For example, the reception power controller 415 may control the wireless power to be transmitted by the wireless power transmitter 310 to be adjusted or terminated through the second wireless communication unit 464 of the low power receiver 448 . In addition, the received power controller 415 may determine at least one characteristic of frequency, voltage, and current to be transmitted by the wireless power transmitter 310 .

In the display device according to the present invention, the wireless power transmitter 310 and the wireless power receiver 410 may include a low power transmitter 348 and a low power receiver 448 . Accordingly, the wireless power transmitter 310 and the wireless power receiver 410 can be mutually recognized and confirmed through wireless communication before main power transmission, so energy can be saved.

13 to 15 are block diagrams sequentially illustrating operations of a wireless power transmitter and a wireless power receiver according to the operation of the display device.

In these drawings, a portion marked with a solid line may represent a portion through which power is transmitted, and a portion marked with a dotted line may represent a portion to which power is not transmitted.

Referring to FIG. 13 , when the display device is turned off, only the low power transmission unit 348 may be in an operating state. The low power transmission unit 348 may be in a standby state so that it can immediately respond when the display device is turned on. That is, only a small amount of control power can flow through the low power transmitter 348 . In this case, since the display device is turned off, the first wireless communication unit 364 of the low power transmission unit 348 may be in a non-operating state.

In this case, all parts of the wireless power receiver 410 may be in a non-operating state. Accordingly, in order to react immediately when the display device is turned on, the remote control receiver or the on switch of the display device may be located in the wireless power transmitter 310.

Referring to FIG. 14 , when the user turns on the display device next, the low power transmitted from the low power transmission unit 348 may be transferred to the low power reception unit 448 through the transmission coil 371 . The display device may be turned on by an on signal of a remote controller or an on switch of a housing.

As described above, since low power is transmitted to the receiving coil 471, power may not be transmitted to the main power receiver 451 by the relay switch. In this case, a method of transmitting low power from the transmission power controller 315 will be described later.

Since power is transmitted to the low power receiver 448, the reception power control unit 415 may control the second wireless communication unit 464 to transmit a signal to the first wireless communication unit 364. The first wireless communication unit 364 may establish a communication channel with the second wireless communication unit 464 so that feedback and control signals can be transmitted.

Referring to FIG. 15, finally, when the wireless power receiver 410 confirms that the feedback and control signals are in a transmittable state, the transmission power controller 315 transmits high power to the main power transmitter 351 there is. In this case, since high power is transmitted to the receiving coil 471, power may be received by the main power receiver 451 by the relay switch. The power received by the main power receiver 451 may be used to drive the display screen.

The reception power control unit 415 may control to transmit a required amount of power according to the display screen. That is, the reception power controller 415 may transmit a feedback signal to the first wireless communication unit 364 through the second wireless communication unit 464 .

16 is a diagram illustrating an embodiment of a method of transmitting low power power and main power power.

Referring to FIG. 16, the amount of current when the transmission power control unit transfers main power to the transmission coil is indicated by a solid line, and the amount of current when the transmission power control unit transfers low power to the transmission coil is indicated by a dotted line. As shown in the drawing, the peak value of the current (I _LA ) transmitted through the low-power transmission unit may be much smaller than the peak value (I _MA ) of the current transmitted through the main power transmission unit. Accordingly, when main power is delivered to the wireless power receiver, the peak value of the current flowing through the wire of the transmitting coil is greater than when transmitting low power, so the electromotive force induced in the receiving coil may be greater than when transmitting low power.

17 is a diagram illustrating another embodiment of a method of transmitting low power power and main power power.

Referring to FIG. 17, (a) of FIG. 17 shows Pulse Width Modulation (PWM) of the transmit power controller when the transmit power controller transfers main power to the transmit coil, and FIG. When the power control unit transmits low power to the transmission coil, it indicates pulse width modulation (PWM) of the transmission power control unit. For example, the width of the pulse may be controlled by adjusting the on/off time of the switch element located in the transmission power controller.

When the transmission power control unit transmits main power, the duty ratio t1/T may be much greater than the duty ratio t2/T when the transmission power control unit transmits low power. That is, the time t1 for turning on the switch when transmitting main power may be longer than the time t2 for turning on the switch when transmitting low power. For example, the time t2 for turning on the switch when the transmission power control unit transmits low power may be 10% or less of the time t1 for turning on the switch when transmitting main power. In this case, the power transmitted to the transmission coil in the low power state may be 10% or less of the power transmitted to the transmission coil in the main power state.

18 is a diagram illustrating another embodiment of a method of transmitting low power power and main power power.

Referring to FIG. 18 , the wireless power transmission unit 310 may include a first transmission coil 371a and a second transmission coil 371b. That is, in the wireless power receiver 410, power may be transmitted by a plurality of transmission coils.

The first transmission coil 371a may be electrically connected to the low power transmission unit 348, and the second transmission coil 371b may be electrically connected to the main power transmission unit 351. That is, the first transmission coil 371a may be a part that transmits low power to the wireless power receiver 410, and the second transmission coil 371b may be a part that transmits main power to the wireless power receiver 410. In this case, the power transmitted to the first transmission coil 371a may be smaller than the power transmitted to the second transmission coil 371b.

In the display device according to the present invention, the first transmission coil 371a for transmitting low power and the second transmission coil 371b for transmitting main power may be separated. Accordingly, the transmit power control unit 315 may not require other circuit configurations for transmitting low power.

The above detailed description should not be construed as limiting in all respects and should be considered illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

Claims (9)

body; and
It includes a housing spaced apart from the body and having a wireless power transmitter for transmitting power to the body,
the body,
a display area where the screen is displayed; and
A circuit area having a wireless power receiver that receives power from the wireless power transmitter and transmits power so that a screen is displayed on the display area,
The wireless power transmitter includes a transmitting coil, and the wireless power receiver includes a receiving coil,
The width of the receiving coil is different from the width of the transmitting coil,
The transmitting coil and the receiving coil,
A cylindrical core containing a magnetic material;
a bobbin surrounding the core; and
A wire wound spirally on the bobbin a plurality of times,
The bobbin,
A display device comprising a groove in which a portion corresponding to the wire is depressed inward.
delete According to claim 1,
the home,
A display device uniformly formed in a spiral shape on the bobbin.
According to claim 3,
the home,
A display device comprising first and second grooves spirally wound in opposite directions on the bobbin.
According to claim 4,
The first groove is recessed into the bobbin by a first width,
The second groove is recessed into the bobbin by a second width,
The first width is different from the second width.
According to claim 1,
The wireless power transmitter,
a low power transmission unit electrically connected to the transmission coil to transmit low power to the transmission coil; and
Further comprising a main power transmission unit electrically connected to the transmission coil to transmit main power to the transmission coil,
The low-power transmission unit includes a first wireless communication unit for transmitting a communication signal with the wireless power reception unit.
According to claim 6,
The first wireless communication unit,
A display device that transmits a communication signal using at least one of NFC, Bluetooth, Wi-Fi, ZigBee, and UWB.
According to claim 6,
When the display device is turned on,
Power is first transmitted to the low-power transmitter,
A display device in which power is transmitted to the main power transmitter after a communication signal is exchanged between the wireless power transmitter and the wireless power receiver.
According to claim 6,
The transmitting coil,
a first transmission coil connected to the low power transmission unit;
A display device comprising a second transmission coil spaced apart from the first transmission coil and connected to the main power transmission unit.

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