JP2013115838A - Display unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for a display unit that checks an electric power distribution efficiency to allow an electric current to be flowed in only a coil having high electric power distribution efficiency without interrupting the distribution of the electric power even with the unit having no built-in battery.SOLUTION: A television 10 includes a television body 20, and a speaker unit 70 separated from the television body 20. The speaker unit 70 is set at a user desired place on the outer periphery of the television body 20. An electric power and an audio-signal are wirelessly transmitted from the television body 20 to the speaker unit 70. A plurality of coils having smaller diameters are disposed over a frame 21 (television side coil part 62) entirely on the television body 20 so as to distribute the electric power in a wide range. In terms of electric power distribution, a magnetic field resonance technique is employed between the television side coil part 62 of the television body 20 and the electric power reception side coil set 80 of the speaker unit 70.

Description

  The present invention relates to a display device, and more particularly to a display device capable of wirelessly supplying power from a display device body to a separate device.

  As a non-contact power supply technique, a technique using electromagnetic induction or magnetic field resonance (electromagnetic resonance) is known. These technologies are used for charging cordless phones, electric toothbrushes, etc., and charging systems for mobile phones, and are commercialized. When these technologies are applied to a display device such as a television to supply power to a separate speaker or the like, a coil with a large outer diameter is used or a small outer diameter is used in order to realize power supply over a wide range. It is necessary to use a plurality of coils. Since it is difficult to secure a space for a coil having a large outer diameter in a thin television or a speaker portion thereof, a plurality of coils having a small outer diameter are used. However, if a current is passed through all of the plurality of power supply coils, the power consumption becomes very large. Thus, in a system for supplying power by electromagnetic induction, a technique is disclosed in which when a plurality of coils are used, a state of power supply efficiency is detected and current is supplied only to the necessary coils (see, for example, Patent Document 1). .

Special table 2009-525715

  By the way, in the technique disclosed in Patent Document 1, since electromagnetic induction is used for power supply, it is necessary to strictly match the positions of the power supply side and the supplied coil. Therefore, when there is only one coil on the power receiving side, the coupling process cannot be performed if the coil is used for power supply. In other words, power cannot be supplied when used for the coupling process. Therefore, in order to operate in a state in which no power supply is received, it is necessary to separately secure a power source such as a battery. However, in a speaker unit system in which it is difficult to secure a sufficient space for a battery due to a reduction in thickness, there is a state where power cannot be temporarily received when detecting a coupling coil. There was a problem that the operation of the.

  This invention is made | formed in view of the above situations, Comprising: It aims at solving the said subject.

The present invention is a display device capable of supplying power from a display device body to a separate receiving device, wherein the display device body includes a power supply coil for supplying power by magnetic field resonance and a transmission coupling coil. A main body side coil set group in which a plurality of trust coil sets are arranged, and a main body side control unit that controls the main body side coil group, and the main body side control unit is connected to the transmission coupling coil and the receiving device. Coupling the provided reception coupling coil to identify the transmission coupling coil with good transmission efficiency for the reception coupling coil, driving the identified transmission coupling coil; Electric power is supplied to the power receiving coil paired with the receiving coupling coil.
The receiving device may be a speaker set, and the main body side coil set group may be disposed inside an outer peripheral cabinet of a display unit of the display device main body, and the receiving device may be attached to the outer peripheral cabinet.
The receiving device may include a charging device and charge the charging device with the power received using the power receiving coil.

  According to the present invention, even if a battery is not built in, the power supply efficiency state is detected without stopping the power supply, and control is performed so that a current is supplied only to a coil with good power supply efficiency. Can be provided.

It is a figure which shows typically the external appearance of the television based on Embodiment. It is a functional block diagram of a television main body and a speaker unit according to the embodiment. It is a flowchart which shows the detection control flow of the speaker unit at the time of starting of the television based on Embodiment. It is a flowchart which shows the control flow after detecting the coil with sufficient electric power supply efficiency which concerns on embodiment once. It is a flowchart which shows the control flow at the time of adding the new speaker unit based on embodiment. It is a figure which shows typically the external appearance of the television which can charge a remote control based on the modification of embodiment. It is a functional block diagram of the television main body and remote control of the television according to the embodiment.

  Next, modes for carrying out the present invention (hereinafter, simply referred to as “embodiments”) will be specifically described with reference to the drawings. FIG. 1 is a diagram schematically illustrating the front of the television 10 according to the present embodiment. The television 10 is a thin display device such as a liquid crystal television or an organic EL television. As shown in the figure, the television body 20 and the speaker unit 70 are separated. The speaker unit 70 is disposed on the outer periphery of the television main body 20 at a place desired by the user. The television main body 20 and the speaker unit 70 can be fixed by fixing with a magnet or by providing a fixing structure for each.

  The power supply from the television body 20 to the speaker unit 70 and the transmission of the audio signal are performed in a cordless manner. In a thin television such as the television 10 of the present embodiment and its speaker device, it is difficult to secure a space using a coil with a large radius. Therefore, as shown in FIG. 1, a plurality of coils with a small radius (TV side coil portion 62) are provided on the entire frame 21 of the TV main body 20, more specifically, inside the front cabinet at the outer peripheral portion of the display panel of the TV main body 20. Power is supplied in a wide range by arranging.

  Further, regarding the power supply, the magnetic field resonance technique is adopted in the television side coil unit 62 of the television body 20 and the power receiving side coil set 80 of the speaker unit 70. In the magnetic field resonance technique, a coil with high power supply efficiency can be detected and coupled, and it is not necessary to strictly align the positions of the power supply coils. In order to detect the state of power supply efficiency, a coupling coil having a resonance frequency different from that of the power supply coil is provided. As a result, the power supply efficiency state is detected by the coupling coil without stopping the power supply, and control is performed so that the current flows only through the coil having a good power supply efficiency.

Here, power transmission by magnetic field resonance will be described. The transmission distance of electric power by magnetic resonance can be transmitted with high efficiency up to twice the coil diameter, and the efficiency tends to gradually decrease when the distance is longer than that. As shown in FIG. 1, when a coil (television side coil portion 62) is provided in the frame 21 of the television main body 20, if the diameter of the coil used is about 5 cm, transmission of power up to about 10 cm is efficient. Is possible. The resonance frequency f is determined by the following equation (1) from the coil inductance L and capacitor capacitance C.
f = (2π × (LC) ^1/2 ) ⁻¹ ... (1)
Since magnetic field resonance is a technique for supplying power between coils having the same resonance frequency, even if a process for detecting the efficiency of power supply is performed by a coupling coil having a resonance frequency different from that of the power supply coil. There is no impact on power supply.

  Hereinafter, a specific configuration will be described. The power supply to the speaker unit 70 that is characteristic of the present embodiment will be mainly described, and description of other general configurations will be omitted as appropriate.

  FIG. 2 is a functional block diagram showing a configuration of the television 10 according to the present embodiment. The television main body 20 includes a power supply unit 22, a display unit 24, a content unit 30, a content processing unit 40, a power supply control unit 50, a coil driving unit 60, and a television side coil unit 62.

  The content unit 30 includes a tuner 32, a decoder 34, and an HDMI receiver 36. The content processing unit 40 includes a video processing unit 42 and an audio processing unit 44.

  The video processing unit 42 processes the video signal input from the content unit 30 and outputs the processed video signal to the display unit 24. The audio processing unit 44 processes the audio signal input from the content unit 30. The signal processed by the audio processing unit 44 is transmitted to the audio signal transmission unit 56.

  The power supply control unit 50 includes a power distribution unit 52, an audio transmission control unit 54, an audio signal transmission unit 56, and a detection signal reception unit 58.

  The power distribution unit 52 supplies the coil drive unit 60 with power converted from alternating current to direct current by the power supply unit 22. The audio transmission control unit 54 performs transmission control of audio signals from the television body 20 to the speaker unit 70. The audio signal transmission unit 56 transmits an audio signal to the speaker unit 70. The transmission method is, for example, infrared communication or wireless communication using a predetermined modulation method. The detection signal receiving unit 58 wirelessly receives the signal detected by the speaker unit 70.

  The coil drive unit 60 includes first to n-th coil drive circuits 61_1 to 61_n that drive the television-side coil unit 62. As described above, the television-side coil unit 62 includes first to n-th power supply coil sets 63_1 to 63_n arranged in the frame 21. The first to n-th coil driving circuits 61_1 to 61_n drive the first to n-th power feeding coil sets 63_1 to 63_n, respectively. Note that the first to nth power supply coil sets 63_1 to 63_n are referred to as power supply coil sets 63 unless otherwise distinguished. Moreover, it may be settable that only a part of the first to n-th power supply coil sets 63_1 to 63_n functions. For example, depending on the user, it may be assumed that the speaker unit 70 is not disposed at a specific location in the frame 21 of the television body 20. In consideration of such a situation, the first to nth power supply coil sets 63_1 to 63_n and the corresponding first to nth coil drives arranged on a specific edge in the vertical and horizontal units of the frame 21 on a predetermined setting screen The circuit 61_1 to 61_n may be set not to function. This is effective from the viewpoint of reducing power consumption.

  Each of the first to nth power supply coil sets 63_1 to 63_n includes a power supply coil 64 and a coupling coil 66 as one set. The power supply coil 64 and the coupling coil 66 have different resonance frequencies. The power supply coil 64 transmits power to the power receiving coil 81 of the speaker unit 70. The coupling coil 66 performs coupling with the coupling coil 82 of the speaker unit 70.

  The speaker unit 70 includes a power supply unit 72, an amplifier unit 74, a power receiving side coil set 80, a current / voltage detection circuit 86, an audio signal receiving unit 91, an output signal processing unit 92, and a power reception control unit 93. And a detection signal transmission unit 94.

  The power receiving side coil set 80 includes a power receiving coil 81 and a coupling coil 82. The power receiving coil 81 receives power supply from the power supply coil 64. The coupling coil 82 performs coupling with the coupling coil 66 of the television side coil section 62 as described above.

  The audio signal receiving unit 91 receives an audio signal transmitted from the television body. The output signal processing unit 92 processes the audio signal received by the audio signal receiving unit 91 and outputs it to the amplifier unit 74. The signal amplified by the amplifier unit 74 is output to the speaker 76, and the speaker 76 is driven.

  The current / voltage detection circuit 86 detects the current level / power level of the coupling coil 82. The power reception control unit 93 controls processing of each element in the speaker unit 70. The detection signal transmission unit 94 transmits a signal (detection signal) for detecting the coupling state to the television main body 20 at a predetermined timing, for example, every second. This timing is set in consideration of power consumption, accuracy desired by the user, and the like, and may be set by the user himself / herself.

  A power supply process by the television 10 having the above configuration will be described. Here, a description will be given focusing on a method of detecting a coil (television side coil unit 62) with particularly high power supply efficiency.

  FIG. 3 shows a detection control flow of the speaker unit 70 when the television 10 is activated. When the power is turned on and activated (S10), since the position of the speaker unit 70 is unknown, the audio transmission control unit 54 once drives all the coil driving units 60 and the power supply coil 64 of the television side coil unit 62. (S12). As a result, the circuit of the speaker unit 70 can be driven as long as it is within the power supply range. In consideration of the time until the circuit of the speaker unit 70 operates stably, waiting processing (Wait processing) is performed for a certain period of time (S14). Thereafter, the power supply level of the coupling coil 66 is compared to detect the coupling coil 66 having a high power supply efficiency.

  Specifically, first, as an initialization process, a flag Max_Index indicating the most efficient coil number is set to “0”, and a flag Max_Level indicating the supply level is set to “0” (S16). Subsequently, the coupling coil i (66) is driven in order from i = 1 (S18). That is, the first coil driving circuit 61_1 is driven in order to perform the coupling process between the coupling coil 66 and the coupling coil 82 of the power receiving side coil set 80. The coupling coil i (66) means the coupling coil 66 provided in the i-th coil drive unit 60_i (i; integer, 1 ≦ i ≦ n). When the coupling is performed, in the speaker unit 70, the current / voltage detection circuit 86 detects the current and the power level, and notifies the power reception control unit 93 to that effect. The power reception control unit 93 transmits the detection result from the detection signal transmission unit 94 to the detection signal reception unit 58 of the television main body 20. The detection signal receiving unit 58 notifies the voice transmission control unit 54 of the received detection result.

  When there is the detection signal from the speaker unit 70 (Y in S20), the voice transmission control unit 54 compares Max_Level with the detected current and power level (S22). The detection result by the coupling coil 66 driven by the i-th coil driving unit 60_i is referred to as a detection level i. When the detection level i is greater than Max_Level (Y in S22), the voice transmission control unit 54 rewrites both the Max_Index and Max_Level flags. In the case of immediately after initialization (i = 1), both flags are always rewritten.

  After the processing of S24 or when the detection level i is equal to or lower than Max_Level (N of S22), the voice transmission control unit 54 increments “i” (S26), and determines whether “i” exceeds “n” or not. Confirm (S28). When “i” does not exceed n (N in S28), the process returns to the process of S18, and the processes of S18 to S28 are continued.

  When “i” exceeds n (Y of S28), the voice transmission control unit 54 drives the i-th coil drive circuit 61_i corresponding to “i” of Max_Index (S30). For example, if “i = 2”, the second coil drive circuit 61_2 is driven, and power supply is started from the power supply coil 64 of the second power supply coil set 63_2.

  Note that the above processing assumes a case where the number of speaker units 70 is one, but in the case of a plurality of cases, when the detection signal transmitting unit 94 transmits the detection result to the detection signal receiving unit 58 of the television body 20. The unique ID is transmitted together. When a plurality of unique IDs appear during processing, the television main body 20 manages Max_Index and Max_Level for each ID. Then, the voice transmission control unit 54 drives the first to nth coil drive circuits 61_1 to 61_n and the first to nth power feeding coil sets 63_1 to 63_n corresponding to the appearing ID. Further, the voice transmission control unit 54 may adjust (correct) the output characteristics of the speaker unit 70 according to which power supply coil set 63 is driven. That is, since the voice transmission control unit 54 can grasp the arrangement of the speaker units 70, the voice transmission control unit 54 can instruct the voice processing unit 44 to achieve an optimum output balance.

  FIG. 4 shows a control flow after once detecting a coil (power supply coil set 63) with high power supply efficiency. The voice transmission control unit 54 monitors the power supply level from the coupled power supply coil 64 to the power reception coil 81 at a certain interval (S12a). When the power level when the coupling is determined falls below a certain threshold value (Y in 14a), the audio transmission control unit 54 changes the position of the speaker unit 70 or disturbs the magnetic field resonance. It is determined that the unit 70 may exist, and the coupling process shown in S16 to S28 is started again. When the coupling is completed, the voice transmission control unit 54 switches to the coil drive circuit 61 corresponding to Max_Index (S30a).

  FIG. 5 shows a control flow when a new speaker unit 70 is added. An item for recoupling is provided on the setting menu of the television 10, or a button for recoupling is provided on the remote control. Then, when the speaker unit 70 is added (S10b) and the item is selected or the recoupling function is selected by pressing the button (S10c), the voice transmission control unit 54 is newly It is checked whether there is a detection signal from the additional speaker unit 70 (S10d). If there is a detection signal (Y in S10d), the processing of S16 to S30 shown in the flow of FIG. 3 is performed, and the power supply level from each coupling coil 64 is compared, and a coil with good power supply efficiency is obtained. To detect.

  If there is no detection signal from the newly added speaker unit 70 (N in S10d), the audio transmission control unit 54 has no built-in battery and the circuit of the speaker unit 70 is not operating or has a built-in battery. Even if it has been done, it is determined that there is a possibility of being out of charge, and all the power supply coils 64 are operated once to supply power to the circuit of the speaker unit 70 (S12), and a waiting process is performed until the circuit is stabilized (S12). S14). Thereafter, the voice transmission control unit 54 checks again whether or not there is a detection signal (S15), and if there is a detection signal (Y in S15), performs a recoupling process (S16 to S28). If there is no detection signal (N in S15), the audio transmission control unit 54 determines that there is no speaker unit 70 to which power can be supplied, operates only the coil driving unit 60 before performing the speaker addition process (S30), and restarts. The coupling process is terminated.

  As described above, according to the present embodiment, the state of power supply efficiency is detected while constantly supplying power without a built-in battery, and control is performed so that power is supplied only to the TV-side coil unit 62 with good power supply efficiency. it can. In addition, when a new speaker unit 70 or the like is connected, it is also possible to detect the television-side coil unit 62 (power supply coil 64) that is driven in a state where power is constantly supplied. Furthermore, by not driving the unnecessary TV side coil unit 62 (power supply coil 64) having poor power supply efficiency, power consumption is reduced and current is passed through the unnecessary TV side coil unit 62 (power supply coil 64). This can also improve the problem of heat generation.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it is understood by those skilled in the art that various modifications can be made to combinations and processes of the respective components, and such modifications are within the scope of the present invention.

  For example, it can be used when charging the remote control of the TV 10 or a mobile phone. FIG. 6 is a diagram schematically illustrating charging of the remote controller 100 by the television body 20. FIG. 7 is a functional block diagram showing the configuration of the television main body 20 and the remote controller 100 configured to perform such processing. The television main body 20 has the same configuration as that of the above-described embodiment.

  The remote controller 100 has a configuration similar to that of the speaker unit 70 with respect to power reception. That is, the remote controller 100 includes a power supply unit 72, a power receiving side coil set 80, a current / voltage detection circuit 86, a power reception control unit 193, and a detection signal transmission unit 194. A different point is that a battery 175, a charging circuit 174, an operation unit 120, and a transmission control unit 110 are provided. The signal transmitter 194 can use an infrared function mounted on the remote controller 100 or the like.

  If the remote controller 100 or a mobile phone (not shown) is within a distance C1 capable of magnetic field resonance with the TV side coil unit 62 (power supply coil 64) built in the TV main body 20, it is non-contact and power is supplied. Electric power can be supplied even if there is a space between the coils for use 64. As a result, there is no need to provide a dedicated mounting portion or the like, and charging can be performed simply by placing the remote controller 100 or the like in a place where magnetic field resonance is possible.

10 TV 20 TV body 22 Power supply unit 24 Display unit 30 Content unit 32 Tuner 34 Decoder 36 HDMI receiver 40 Content processing unit 42 Video processing unit 44 Audio processing unit 50 Power supply control unit 52 Power distribution unit 54 Audio transmission control unit 56 Audio signal transmission Unit 58 detection signal receiving unit 60 coil driving unit 61 coil driving circuit 61_1 first coil driving circuit 61_2 second coil driving circuit 61_n n coil driving circuit 62 TV side coil unit 63 feeding coil set 63_1 first feeding coil set 63_2 2nd power supply coil set 63_n nth power supply coil set 64 power supply coil 66 coupling coil 70 speaker unit 72 power supply unit 74 amplifier unit 76 speaker 80 power receiving side coil set 81 power receiving coil 82 coupling coil 86 current-voltage detecting circuit 91 the audio signal receiving unit 92 output signal processing unit 93 power receiver controller 94 detects the signal transmission unit 100 remote control 110 transmits control unit 120 operation unit 174 charging circuit 175 battery 193 power reception control unit 194 signal transmission unit

Claims (3)

A display device capable of supplying power from a display device body to a separate receiving device,
The display device body includes a body-side coil set group in which a plurality of transmission coil sets including a power supply coil and a transmission coupling coil configured to supply power by magnetic field resonance are arranged;
A main body side control unit for controlling the main body side coil set group;
With
The main body-side control unit couples the transmission coupling coil to a reception coupling coil provided in the reception device, so that the transmission coupling with respect to the reception coupling coil has good transmission efficiency. A display device characterized in that a coil is specified, the specified transmission coupling coil is driven, and power is supplied to a power reception coil paired with the reception coupling coil.
The receiving device is a speaker set,
The display device according to claim 1, wherein the main body side coil set group is disposed inside an outer peripheral cabinet of a display unit of the display device main body, and the receiving device is attached to the outer peripheral cabinet.
  The display device according to claim 2, wherein the receiving device includes a charging device and charges the charging device with the power received using the power receiving coil.

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