JP2009135843A - Indicator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an indicator in a novel structure that reduces a risk of physical damage, can also advantageously cope with the model change of a display device or a control unit. <P>SOLUTION: A display device 14 having a display element 24, and display control units 16, 18 for transmitting power and a display control signal to the display device 14 are formed separately while they are independent mutually. A pair of coil members 46, 120 that can be separated mutually are connected to core members 48, 122 in a state of electromagnetic coupling. As a result, in an interface for transmission for transmitting and receiving at least one of power and a signal by utilizing electromagnetic induction, the coil member 46 is attached to the display device 14, and the coil member 120 is attached to the display control unit 18. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a display device including a display element that displays various numbers, characters, figures, and the like.

  2. Description of the Related Art Conventionally, display devices including LEDs and liquid crystals are known as display elements that display various numbers, characters, figures, and the like. Since these display devices can be formed in a plate shape and can be made thinner, smaller and lighter than a cathode ray tube or the like, for example, LEDs are applied to signboards and electric bulletin boards in trains, and liquid crystals are televisions. Not only is it being used for station advertisements, timetables, supermarket price tags, and hospital room name tags.

  By the way, a display device provided with such a display element is connected to a display control device that controls the operation of the display device, for example, as described in Patent Document 1 and Patent Document 2, for example, In general, power is supplied to the display element, and the operation of the display element is controlled by transmitting a control command as a signal to the display element drive circuit using serial communication or the like. Is.

  As described above, in order to control the operation of the display element, the display device and the display control device are generally connected to each other by a connector. In such a connector connection, when the connector is inserted and removed, the connector is connected to the connector. There was a risk that the connector could be physically damaged due to excessive force. Especially in the manufacturing stage of a display device, in order to inspect whether or not the display element operates normally, the connector is often inserted and removed frequently, and there is a high risk of damaging the connector in such an inspection stage. It was.

  Furthermore, in connector connection, if a change in the connector shape occurs due to a model change or the like in either the display device or the display control device, the other connector must also be exchanged, and the connector shape can be flexibly dealt with. It was difficult.

JP 7-128680 A JP-A-8-166590

  Here, the present invention has been made in the background as described above, and the problem to be solved is to reduce the risk of physical damage and to change the model of the display device or the control device. It is another object of the present invention to provide a display device having a novel structure that can be advantageously handled.

  Hereinafter, embodiments of the present invention made to solve the above-described problems will be described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  That is, a first aspect of the present invention includes a display device configured to include a display element and a display element drive circuit, and a control circuit that transmits and receives a display control signal between the display device and the drive circuit of the display device. A display control device configured to include a power supply circuit that supplies power is formed separately and independently from each other, and a pair of coil members that can be separated from each other are electromagnetically coupled to the core member. By connecting, a transmission interface that transmits and receives at least one of electric power and signals using electromagnetic induction is configured, and one of the pair of coil members in the transmission interface is attached to the display device and the other is The display is characterized by being mounted on a display control device.

  In the display device having the structure according to this aspect, the display device and the display control device are separately formed separately from each other, and the pair of coil members constituting the transmission interface can be separated from each other. Electromagnetic induction is used to transmit at least one of electric power and signals. Thereby, a display apparatus and a display control apparatus can be electrically connected without having a contact. Therefore, for example, a strong fitting such as connector connection is not required, so that the possibility of physical damage due to insertion / removal can be avoided.

  In addition, since connection by fitting is not required, the shape change of the coil member and the core member can be dealt with more flexibly than the shape change when the connector connection is adopted. Even when a model change occurs in the display control device, it can be dealt with more flexibly. Furthermore, since the connection by fitting is not required, the mechanical freedom in connecting the display device and the display control device can be increased, and the connection between the display device and the display control device can be made easier. It can also be done.

  In addition, the display element in this aspect is not specifically limited, For example, a conventionally well-known liquid crystal, LED, etc. can be employ | adopted suitably. Moreover, the number of core members is not necessarily limited to one, and may be plural. For example, a pair of coil members are provided on a single core member in a detachable manner, and a pair of coil heads are provided to form a magnetic path by providing a core member on each of the pair of coil members. May be separable from each other.

  According to a second aspect of the present invention, in the display device according to the first aspect, a cholesteric liquid crystal is used as the display element.

  Cholesteric liquid crystal has bistability that stabilizes both the focal conic state that transmits light on the screen and the planar state that reflects specific light (wavelength selective reflection) without applying voltage. In the display device having the structure according to this embodiment, display contents can be held without applying a voltage. As a result, it is not necessary to always supply power in order to maintain the display content, and the running cost can be reduced. Therefore, the present invention can be suitably applied to, for example, station advertisements, timetables, supermarket price tags, hospital room name tags, and the like that do not frequently rewrite display contents.

  More preferably, a power supply interface for transmitting power and a control interface for transmitting signals are configured as the transmission interface, and one of the pair of coil members constituting the power supply interface is provided. One of the pair of coil members constituting the control interface is attached to the display device and the other is attached to the display control device while being attached to the display device and the other to the display control device. Aspect is employed.

  That is, since the display device in this embodiment uses cholesteric liquid crystal as a display element, it is sufficient that the driving power is supplied only when the display contents are rewritten. Therefore, by providing both a control interface and a power supply interface and supplying power together with a display control signal from the display control device to the display device, it is not necessary to incorporate a power supply device such as a storage battery in the display device. I can do it. As a result, more efficient power supply can be performed and not only power saving of the display device can be achieved, but also the circuit configuration of the display device can be simplified, facilitating manufacturing and compactness. Can also be achieved.

  According to a third aspect of the present invention, in the display device according to the first or second aspect, at least one of the coil member and the core member attached to at least one of the display device and the display control device, It is characterized by being detachable from the display device or the display control device.

  In the display device having the structure according to this aspect, the coil member and the core member can be easily replaced. This makes it easier to change and tune the coil member and core member to appropriate ones according to the surrounding environment such as the required accuracy of signal and power transmission and reception, the level of electromagnetic noise, and electromagnetic noise. At the same time, the coil member and the core member can be changed more flexibly.

  According to a fourth aspect of the present invention, in the display device according to any one of the first to third aspects, an electromagnetic shielding member is disposed around the core member. According to this aspect, it is possible to suppress the influence of electromagnetic waves generated from the coil member on other electronic components, and also to reduce noise received from other electronic components, thereby further transmitting and receiving signals and power. It can be performed stably.

  According to a fifth aspect of the present invention, in the display device according to any one of the first to fourth aspects, a low permeability member is disposed around the core member. According to this aspect, by making the relative permeability around the core member sufficiently lower than that of the core member, it is possible to more effectively suppress the leakage magnetic flux from the core member, and to obtain better transmission efficiency. I can do it. Here, as the low magnetic permeability member, for example, a conventionally known member such as polytetrafluoroethylene or epoxy resin can be appropriately employed. In this aspect, in the display device according to the fourth aspect, an aspect in which a low permeability member is interposed between the core member and the electromagnetic shielding member is suitably employed. In this way, it is possible to suppress the eddy current generated in the electromagnetic shielding member by the magnetic force lines generated from the coil head, and it is possible to suppress the magnetic energy of the coil head from being absorbed by the eddy current.

  According to a sixth aspect of the present invention, in the display device according to any one of the first to fifth aspects, a coil head in which the core member is combined with the coil member to form a magnetic path around the coil member. And transmitting and receiving at least one of electric power and signal using electromagnetic induction by positioning the transmitting and receiving surfaces, which are the open surfaces of the magnetic paths formed by the core members, facing each other. The transmission interface is configured including a type interface.

  In the display device having the structure according to this aspect, since the signal and power can be transmitted only by making the transmission and reception surfaces of the core members face each other, the electrical connection between the display device and the display control device can be made. It can be done more easily. In this case, the transmitting and receiving surfaces of both core members may be opposed to each other while being in contact with each other, and the leakage of magnetic flux is transmitted to the extent that the substantial continuity of the magnetic path can be maintained. It is also possible to place them facing each other so as not to cause a problem above. According to the former, leakage of magnetic flux is suppressed and more stable transmission is possible. According to the latter, the display device and the display control device can be electrically connected to each other in a non-contact state. The risk of physical damage during connection can be further reduced.

  According to a seventh aspect of the present invention, in the display device according to the sixth aspect, the display device is provided with an insulating substrate including the display element, and the insulating substrate is provided on the opposite side of the display element. The core member is provided.

  In the display device having the structure according to this aspect, the core member can be hidden by the insulating substrate by interposing the insulating substrate between the display element and the core member. Further, by disposing the core member on the side opposite to the display element that requires a relatively large disposition space, the disposition space of the core member can be advantageously ensured. Here, the transmitting / receiving surface of the core member may be directed to the display element side, or may be directed to the side opposite to the display element. For example, by directing the transmission / reception surface to the display element side, the coil head of the display device and the coil head of the display control device are opposed to each other with the display element interposed therebetween, in other words, the coil head of the display control device is overlapped with the display element. It is possible to transmit power and signals in the same manner.

  According to an eighth aspect of the present invention, in the display device according to the sixth or seventh aspect, an insulating substrate including the coil member is provided on at least one of the display device and the display control device. The insulating substrate is formed with an insertion hole through which the core member is inserted, and the core member is projected from the opposite side of the insulating substrate to the coil member through the insertion hole. This is a feature.

  In the display device having the structure according to this aspect, the coil member is formed on the insulating substrate in advance, and the core member is inserted into the insertion hole of the insulating substrate on which the coil member is formed. A coil member can be accommodated in the groove. Thereby, an assembly with a core member and a coil member can be performed more easily. Moreover, the protrusion dimension of the core member from the insulating substrate can be suppressed, and the display device and the display control device can be made compact.

  Therefore, more preferably, a mode is adopted in which the coil member is formed by a conductor pattern formed on the insulating substrate. If it does in this way, a coil can be formed on the electrical equipment surface of an insulating substrate, for example, and the projection dimension from an insulating substrate can be suppressed more. Furthermore, by forming the coil member with a conductor pattern, it is possible to stabilize the shape of the coil member, in particular, to stabilize the coil shape when displaced. However, the conductor pattern may be formed on the surface of the insulating substrate, or may be formed not only on the surface of the insulating substrate but also inside. Preferably, the coil member is laminated and formed by printing or the like on the insulating layer. As the insulating substrate, various conventionally known ones such as a hard substrate and a flexible substrate can be used.

  According to a ninth aspect of the present invention, in the display device according to any one of the first to fifth aspects, a pair of the coil members and an annular core member that couples the coil members in an electromagnetically coupled state are combined. The transmission interface including a ring-type interface that transmits and receives at least one of electric power and signals using electromagnetic induction by removably assembling the annular core member to at least one of the pair of coil members It is characterized by comprising.

  In the display device having the structure according to this aspect, the signal and power can be transmitted by assembling the annular core member to the coil member, so that the display device and the display control device can be easily electrically connected. I can do it. Furthermore, since it is possible to easily realize a state in which the coil member can be displaced in the circumferential direction of the annular core member, the degree of freedom in connection between the display device and the display control device can be improved, and the connection can be made more easily. Can be done.

  In this aspect, an aspect in which a gap is formed between at least one of the pair of coil members and the annular core member is suitably employed. If it does in this way, the displacement to the direction (direction which accompanies a change of a linkage angle) which twists and inclines with respect to the annular core member of a coil member is accept | permitted. As a result, a greater degree of freedom of relative movement between the pair of coil members can be ensured, and the display device and the display control device can be more easily connected.

  In this aspect, an aspect in which the annular core member has an annular shape is also preferably employed. In this way, since the annular core member does not have corners, loss of magnetic flux at the corners can be suppressed, and more stable transmission can be performed. However, the annular core member in this aspect does not necessarily show an annular shape, and includes various irregular ring shapes such as an ellipse and a polygon. The annular core member does not necessarily have to be continuous over the entire circumference, and may be discontinuous in the circumferential direction to form an air gap.

  According to a tenth aspect of the present invention, in the display device according to the ninth aspect, a plurality of the annular core members are provided between the pair of coil members. According to this aspect, the degree of freedom of relative displacement between the pair of coil members can be further ensured. Thereby, even if the relative position of the display device and the display control device changes during the transmission of power and signals, the transmission can be continued.

  An eleventh aspect of the present invention is the display device according to the ninth or tenth aspect, wherein the annular core member forms a closed magnetic circuit in a closed state and can be opened and closed so as to cut the closed magnetic circuit in an open state. It is said that it is said.

  In the display device according to this aspect, the annular core member can be detached from the coil member by opening the annular core member, and can be assembled to the coil member by closing the annular core member. Therefore, it is possible to easily assemble and remove the annular core member from the coil member.

  According to a twelfth aspect of the present invention, in the display device according to any one of the ninth to eleventh aspects, a plurality of the display devices are connected to the coil member attached to the display control device. The coil members attached to each are connected in an electromagnetically coupled state so that at least one of power and signals can be transmitted and received.

  In the display device having the structure according to this aspect, power and signals can be transmitted from one display control device to a plurality of display devices. Thereby, for example, display contents of a plurality of display devices can be rewritten at a time. Here, the annular core member may be one or plural. That is, one annular core member may be assembled to the coil member attached to the display control device, and the coil member attached to each of the plurality of display devices may be assembled to the annular core member, or a plurality of displays may be assembled. An annular core member may be assembled for each coil member attached to each of the devices, and each annular core member may be assembled to a coil member attached to the display control device.

  According to a thirteenth aspect of the present invention, in the display device according to the twelfth aspect, identification information for designating at least one of the plurality of display devices to the control circuit in the display control device, and the identification information A display device selection control circuit that includes drive control information for specifying the operation content of the drive circuit in the display device corresponding to the display control signal, and transmits the display control signal to the drive circuit in the display device. Determining whether or not the identification information included in the display control signal is identification information indicating self, and if the identification information is identification information indicating self, the drive control included in the display control signal A control information acquisition circuit for driving the display element based on information is provided.

  In the display device structured according to this aspect, the display content of a specific display device can be selectively changed from among a plurality of display devices connected to the display control device. The identification information included in the display control signal may specify a plurality of display devices. In this way, it is possible to simultaneously rewrite the display contents of a plurality of specific display devices from among the plurality of display devices connected to the display control device.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 shows a display 10 as a first embodiment of the present invention. The display 10 includes a display shelf 12 used in a supermarket, a plurality of (three in the present embodiment) display devices 14 that are attached to the display shelf 12 and used as price tags, and are independent from the display device 14. And a controller 16 and a computer 18 as a display control device that rewrites the display content of the display device 14.

  FIG. 2 shows the display device 14. The display device 14 has a substantially rectangular box shape, and a liquid crystal panel 24 serving as a display element housed in the case 20 can be seen through an opening window 22 opened in the case 20. . In the following description, unless otherwise specified, the front surface refers to the surface on which the liquid crystal panel 24 is provided, and the back surface and the back surface refer to surfaces opposite to the liquid crystal panel 24.

  A liquid crystal module 26 shown in FIGS. 3 and 4 is accommodated in the case 20. The liquid crystal module 26 includes, for example, a primary-side transmission terminal 30 for transmitting power and control signals to and from the liquid crystal panel 24 and the controller 16 on one surface of an insulating substrate 28 formed of silicon or the like. Are provided on the opposite surface of the liquid crystal panel 24, a drive circuit 32 for controlling the operation of the liquid crystal panel 24, a rectifying and stabilizing circuit 34 for supplying power to the liquid crystal panel 24, the controller 16 and the like. Various electronic components such as a liquid crystal side communication circuit 36 for transmitting and receiving control signals between them are provided.

  The liquid crystal panel 24 is a liquid crystal panel using a conventionally known cholesteric liquid crystal, and by using the bistability characteristic of the cholesteric liquid crystal, the display content can be maintained even when no voltage is applied. . The liquid crystal panel 24 includes a scanning driver circuit 38 that sequentially scans the row electrodes for each row, and a column electrode corresponding to a desired column on the scanned row electrode based on image data to be displayed. A data driver circuit 40 for applying a voltage is connected. The scan driver circuit 38 and the data driver circuit 40 are electrically connected to a flat cable 42, and the flat cable 42 wraps around the substrate 28 and is provided on the surface of the substrate 28 opposite to the liquid crystal panel 24. By being connected to the connector 44, the drive circuit 32 and the like are electrically connected.

  Further, a primary-side transmission terminal 30 is provided at a corner of the substrate 28 on the same surface as the liquid crystal panel 24 (in this embodiment, a lower right corner in FIG. 3). 5 and 6 show the primary-side transmission terminal 30. FIG. The primary transmission terminal 30 is formed by winding a signal primary core 48 as a core member around which a signal primary coil 46 as a coil member is wound, and a power primary coil 50 as a coil member. The power primary core 52 as the core member is accommodated in a primary accommodation case 54 as an electromagnetic shielding member.

  The signal primary core 48 is a so-called pot-shaped core made of a ferromagnetic material such as ferrite and having a substantially annular shape, and is open on one end face 56 in the axial direction (rightward in FIG. 6). A lead groove 58 is formed over the entire circumference. The signal primary coil 46 is formed by winding a lead wire made of copper or the like in the lead groove 58 a predetermined number of times. Thereby, in this embodiment, the signal primary side core 48 and the signal primary side coil 46 constitute a first coil head on the display device 14 side, and the signal primary side core 48 constitutes a signal primary side. A magnetic path of the side coil 46 is formed, and an end surface 56 of the signal primary core 48 is used as a transmission / reception surface. The number of turns of the signal primary coil 46 can be appropriately set in consideration of required transmission characteristics and the like. For example, the signal primary side coil 46 may be wound only around a half circumference of the lead groove 58, or the signal primary side coil 46 may be overlapped in the lead groove 58 so that there is almost no gap. You may do it.

  On the other hand, the power primary core 52 is a so-called pot-type core made of a ferromagnetic material such as ferrite and having a substantially annular shape, and has one end face 60 in the axial direction (right direction in FIG. 6). A lead groove 62 is formed over the entire circumference. Here, the inner diameter dimension of the power primary core 52 is larger than the outer diameter dimension of the signal primary core 48. The lead wire 50 formed of copper or the like in the lead groove 62 is wound a predetermined number of times, whereby the power primary coil 50 is formed. Thus, in the present embodiment, the power primary side core 52 and the power primary side coil 50 constitute a second coil head on the display device 14 side, and the power primary side core 52 constitutes the power primary side. The magnetic path of the side coil 50 is formed, and the end surface 60 of the power primary core 52 is used as a transmission / reception surface. The number of turns of the power primary coil 50 can be set as appropriate in consideration of required transmission characteristics and the like. For example, the primary coil 50 for power may be wound only half a circumference of the lead groove 62, or the primary coil 50 for power is wound in layers in the lead groove 62 so that there is almost no gap. You may do it.

  The signal primary side core 48 and the power primary side core 52 are assembled to the primary side accommodation case 54 in the accommodated state. The primary housing case 54 is made of a nonmagnetic material such as aluminum or copper, for example, and has a small diameter portion 64 formed on one side of an intermediate portion in the axial direction (left and right direction in FIG. 6), and the other The large-diameter portion 66 having a larger diameter than the small-diameter portion 64 is formed on the concentric shaft, so that the small-diameter portion 64 protrudes from the center of the large-diameter portion 66 as a whole and has a stepped cylindrical shape. ing.

  Further, a circular first opening 68 that opens to the protruding tip surface is formed in the small diameter portion 64 of the primary side accommodation case 54, while the large diameter portion 66 on the side where the small diameter portion 64 is formed. An annular second opening 70 having an inner diameter larger than that of the small diameter portion 64 is formed in the end surface. The signal primary core 48 is accommodated in the first opening 68, while the power primary core 52 is accommodated in the second opening 70. In such an accommodation state, the signal primary core 48 and the power primary core 52 are disposed on the concentric shaft, and the outer peripheral portions except for the end faces 56 and 60 serving as the transmission / reception surfaces are respectively provided in the primary accommodation case 54. It is supposed to be covered. As a result, an electromagnetic shielding structure is configured by the primary housing case 54, and the magnetic lines of force that leak from the signal primary core 48 and the power primary core 52 affect each electronic component provided on the substrate 28. In addition, the possibility that the lines of magnetic force from the respective electronic components provided on the substrate 28 affect the electromagnetic induction action of the signal primary side core 48 and the power primary side core 52 is reduced.

  Further, particularly in the present embodiment, gap members 72 and 74 as low permeability members are interposed between the signal primary side core 48 and the power primary side core 52 and the primary side accommodation case 54. In addition, the outer peripheral surfaces of both the cores 48 and 52 excluding the end surfaces 56 and 60 serving as the transmitting and receiving surfaces are covered with gap members 72 and 74. Here, as the gap members 72 and 74, conventionally known members having a small relative magnetic permeability can be appropriately employed, and specific examples thereof include polytetrafluoroethylene and epoxy resin. More preferably, the gap members 72 and 74 are non-conductive members. In the present embodiment, polytetrafluoroethylene is used as the gap members 72 and 74. As a result, the leakage magnetic flux from both the cores 48 and 52 is suppressed, and the generation of eddy currents in the primary housing case 54 due to the influence of the magnetic lines of force is also suppressed. The risk of reducing energy is also reduced.

  Such primary-side transmission terminals 30 are arranged at the corners of the surface of the substrate 28. Then, as shown in FIG. 2, end faces 56 and 60 serving as transmission / reception surfaces of the signal primary core 48 and the power primary core 52 through the opening 76 penetrating the case 20 that accommodates the liquid crystal module 26. Are exposed on the surface of the display device 14.

  Further, as shown in FIG. 4, a signal power primary side coil 78 as a coil member is provided in a substantially central portion of the surface of the substrate 28 opposite to the liquid crystal panel 24. The primary coil 78 for signal power projects from the back surface of the substrate 28 and extends in the vertical direction (the vertical direction in FIG. 4). An opening 80 (see FIGS. 7 and 8) provided in the case 20 is opened in the vertical direction, and is communicated with the primary coil 78 for signal power.

  As shown in FIGS. 7 and 8, the display device 14 having such a structure is engaged with a fence 84 of the display shelf 12 via an annular core member 82. As shown in FIG. 9, the annular core member 82 in the present embodiment has a substantially circular shape extending over the entire circumference with a constant circular cross section formed of a ferromagnetic material such as ferrite. In particular, in the present embodiment, the annular core member 82 is configured by combining a plurality of (two in the present embodiment) core forming members 86 and 86. The core forming member 86 has a semicircular shape extending over a half circumference with a constant circular cross section. Then, the end portions of the core forming members 86, 86 are fitted from both sides in the axial direction of the connecting member 88 formed of a conventionally known synthetic resin material or rubber material such as ABS or natural rubber, for example, so that the entire ring An annular core member 82 having a shape is formed.

  On the other hand, as shown in FIG. 10, the fence 84 includes a frame-like frame 90 formed of a ferromagnetic material such as iron, for example, and a lead wire such as copper is once applied to the frame 90. A secondary coil 92 for signal power formed by winding a suitable number of times from less than a plurality of times is fixed by bonding or the like. The entire frame 90 to which the signal power secondary coil 92 is attached is covered with polyvinyl chloride or the like to form a fence 84.

  Then, after one of the core forming members 86, 86 is inserted into the opening 80 of the display device 14, the core forming members 86, 86 are connected to each other in a state where the fence 84 is sandwiched between the other core forming members 86. Connected at 88. Accordingly, the display device 14 is detachably attached to the fence 84 via the annular core member 82, and the annular core member 82 is provided on the signal power primary coil 78 and the fence 84 provided on the display device 14. The signal power secondary coil 92 is inserted.

  Such a display device 14 can rewrite the display content of the liquid crystal panel 24 by operating the controller 16 or the computer 18.

  First, the controller 16 has a structure in which a transmitter 102 is connected to an input device 100 as shown in FIG. The input device 100 includes an input unit 104 configured by a keyboard and buttons that can input numerical values and characters, and a display unit 106 configured by a liquid crystal display panel that can display input contents and various information.

  The input device 100 is supplied with driving power from the input device 100 and also supplied from the power supply circuit 108 (see FIG. 15) as a power supply circuit for supplying driving power to the display device 14 or from the input unit 104. A control circuit 110 (see FIG. 15) as a control circuit for controlling the operation of the display device 14 based on the information, and an inverter 111 (see FIG. 15) connected to the power supply circuit 108 and a control side connected to the control circuit 110 A communication circuit 113 (see FIG. 15) is incorporated.

  Furthermore, a transmitter 102 is connected to the input device 100 via a connection cable 112. As shown in FIG. 11, the transmitter 102 has a grip portion 114 having a substantially rod shape, and the connection cable 112 extends from one end of the grip portion 114. At the other end, an opening 116 is formed that is bent at a substantially right angle from the extending direction of the gripping portion 114 (vertical direction in FIG. 11) and the tip is opened. The secondary transmission terminal 118 is exposed in the opening 116.

  12 and 13 show the secondary side transmission terminal 118. The secondary transmission terminal 118 includes a signal secondary core 122 as a core member around which a signal secondary coil 120 as a coil member is wound, and a power secondary coil 124 as a coil member. The secondary side core 126 for electric power as a core member wound around is accommodated in a secondary side accommodation case 128 as an electromagnetic shielding member.

  The signal secondary core 122 is a so-called pot-type core made of a ferromagnetic material such as ferrite and having a substantially annular shape, and has one end face 130 in one of the axial directions (left direction in FIG. 13). A lead groove 132 is formed over the entire circumference. The signal secondary coil 120 is formed by winding a lead wire formed of copper or the like in the lead groove 132 a predetermined number of times. Thereby, in this embodiment, the signal secondary side core 122 and the signal secondary side coil 120 constitute a first coil head on the controller 16 side, and the signal secondary side core 122 generates a signal. The magnetic path of the secondary coil 120 for a signal is formed, and the end surface 130 of the secondary core 122 for a signal is used as a transmission / reception surface. The number of turns of the signal secondary coil 120 can be set as appropriate in consideration of required transmission characteristics and the like. For example, the signal secondary coil 120 may be wound only around the half circumference of the lead groove 132, or the signal secondary coil 120 may be overlapped in the lead groove 132 so as to have almost no gap. You may wind.

  On the other hand, the power secondary core 126 is a so-called pot-shaped core made of a ferromagnetic material such as ferrite and having a substantially annular shape, and is one of the axial directions (left direction in FIG. 13). A lead groove 136 opened in the end face 134 is formed over the entire circumference. Here, the inner diameter dimension of the power secondary core 126 is larger than the outer diameter dimension of the signal secondary core 122. A lead wire made of copper or the like is wound around the lead groove 136 a predetermined number of times, whereby the power secondary coil 124 is formed. Thereby, in this embodiment, the power secondary side core 126 and the power secondary side coil 124 constitute a second coil head on the controller 16 side. The magnetic path of the secondary coil 124 for electric power is formed, and the end surface 134 of the secondary core 126 for electric power is used as a transmission / reception surface. Note that the number of turns of the power secondary coil 124 can be appropriately set in consideration of required transmission characteristics and the like. For example, the power secondary coil 124 may be wound only half the circumference of the lead groove 136, or the power secondary coil 124 may be stacked in layers in the lead groove 136 so that there is almost no gap. You may wind.

  The signal secondary core 122 and the power secondary core 126 are assembled to the secondary housing case 128 in the accommodated state. The secondary housing case 128 is made of, for example, a nonmagnetic material such as aluminum or copper, and has an opening 138 that opens in an end surface 137 in one axial direction (leftward in FIG. 13) in the central portion. The whole has a substantially bottomed cylindrical shape.

  Further, a circular first opening 142 that opens to the bottom surface 140 is formed in the opening 138 of the secondary housing case 128, while an annular shape that opens to the end surface 137 is formed outside the opening 138. The second opening 144 is formed. The first opening 142 accommodates the signal secondary core 122, while the second opening 144 accommodates the power secondary core 126. In such an accommodation state, the signal secondary core 122 and the power secondary core 126 are disposed on the concentric shaft, and the outer peripheral portions excluding the end faces 130 and 134 serving as the transmitting and receiving surfaces are respectively accommodated on the secondary side. The case 128 is covered. As a result, an electromagnetic shielding structure is configured by the secondary housing case 128, and magnetic lines that leak from the signal secondary core 122 and the power secondary core 126 are generated in other electronic components provided in the controller 16. The possibility that the magnetic field lines from the respective electronic components provided in the controller 16 affect the electromagnetic induction action of the signal secondary core 122 and the power secondary core 126 is reduced.

  Further, particularly in the present embodiment, gap members 146 and 148 as low permeability members are interposed between the signal secondary core 122 and the power secondary core 126 and the secondary housing case 128. I'm hurt. The gap members 146 and 148 have substantially the same structure as the gap members 72 and 74 described above, and both cores 122 and 126 have outer circumferential surfaces other than the end surfaces 130 and 134 serving as transmission / reception surfaces by the gap members 146 and 148. Covered. As a result, the leakage magnetic flux from both the cores 122 and 126 is suppressed, and the generation of eddy currents in the secondary housing case 128 due to the influence of the lines of magnetic force is also suppressed. The risk of reducing magnetic energy is also reduced.

  Such a secondary transmission terminal 118 is electrically connected to the power supply circuit 108 and the control circuit 110 provided in the input device 100 via the connection cable 112, and the opening 116 of the transmitter 102. It is exposed to the outside through. As is clear from the above description, the signal primary coil 46 and the power primary coil 50 in the present embodiment are provided in the display device 14, while the signal secondary coil 120 corresponding thereto is provided. The power secondary coil 124 is provided in the controller 16 formed separately from the display device 14, and the coils 46, 50 and 120, 124 can be separated from each other.

  When the display content of the display device 14 is updated, the secondary transmission terminal 118 having such a structure, as shown in FIG. The primary-side transmission terminal 30 and the secondary-side transmission terminal 118 are overlapped so that the small-diameter portion 64 is fitted. As a result, the end face 56 of the signal primary core 48 and the end face 130 of the signal secondary core 122 are opposed to each other in a slightly non-contact state, and the signal primary coil 46 and the signal secondary coil 46 are opposed to each other. The side coil 120 is electromagnetically coupled, and the end face 60 of the power primary core 52 and the end face 134 of the power secondary core 126 are opposed to each other in a non-contact state with a slight separation therebetween, so that the power primary coil 50 and the power secondary coil 124 are electromagnetically coupled. As a result, the control signal and power can be transmitted between the display device 14 and the controller 16 in a non-contact state. Thus, in this embodiment, the signal primary side coil 46, the signal primary side core 48, the signal secondary side coil 120, and the signal secondary side core 122 are opposed to each other as a transmission interface. The power primary side coil 50, the power primary side core 52, the power secondary side coil 124, and the power secondary side core 126 are opposed to each other as a transmission interface. The interface is configured. Here, particularly in the present embodiment, the primary-side storage case 54 has a convex cross-section as a whole, while the secondary-side storage case 128 has a concave cross-section as a whole, so that the signal primary-side core 48 and the end faces 56 and 130 of the signal secondary side core 122 and the end faces 60 and 134 of the power primary side core 52 and the power secondary side core 126 are opposed to each other on different planes. . In FIG. 14, the end surfaces 56 and 60 of the primary transmission terminal 30 and the end surfaces 130 and 134 of the secondary transmission terminal 118 are slightly separated from each other. Although the control signal and power can be transmitted in the contact state, the end faces 56, 60 and 130, 134 may be brought into contact with each other.

  In the present embodiment, both ends of the lead wire constituting the signal power secondary coil 92 provided on the fence 84 are connected to the control box 150 and the control box 150 is connected to the computer 18. Yes. The computer 18 and the control box 150 are included to constitute another display control device.

  The control box 150 in the present embodiment has substantially the same structure as the control-side communication circuit 152 having the same structure as the control-side communication circuit 113 provided in the controller 16 and the inverter 111 provided in the controller 16. An inverter 154 having the structure is provided. A control circuit 156 serving as a control circuit for controlling the operation of the display device 14 includes a CPU of the computer 18, and a power supply circuit 158 that supplies power to the display device 14 serves as a power supply circuit for the computer 18. It is configured to include.

  FIG. 15 schematically shows configurations of the display device 14, the controller 16, the computer 18, and the control box 150 in the present embodiment, and the transmission paths of power and signals supplied from the controller 16 and the computer 18 to the display device 14 are described. To do.

  First, the transmission path of the power supplied from the controller 16 to the display device 14 will be described. The inverter 111 is connected to the power supply circuit 108 of the controller 16. As the inverter 111, for example, a conventionally known inverter of CVCF type or VVVF type can be appropriately employed. The DC voltage of the power supply circuit 108 is converted into a high frequency voltage by the inverter 111. Here, the frequency (output frequency) of the high-frequency voltage converted by the inverter 111 differs depending on the power to be supplied, the usage environment, etc., but in this embodiment, it is set appropriately within a range of about 100 Hz to 500 MHz. Has been.

  The high-frequency voltage converted by the inverter 111 is fed to the power secondary coil 124, so that a magnetic flux that changes through the output frequency is generated through the power secondary coil 124. The magnetic flux passing through the power secondary coil 124 passes through the power primary core 52 provided in the display device 14 from the power secondary core 126 and is linked to the power primary coil 50. As a result, an induced electromotive force is generated in the power primary coil 50 due to the mutual induction action, and the high-frequency voltage supplied to the power secondary coil 124 is taken out from the power primary coil 50. In this manner, the power supplied from the power supply circuit 108 is transmitted from the power secondary coil 124 to the power primary coil 50 in a non-contact state. The high frequency voltage extracted from the power primary coil 50 is converted into a DC voltage by the rectifying and stabilizing circuit 34 and then supplied to the drive circuit 32 and the liquid crystal side communication circuit 36.

  Next, a transmission path for control signals transmitted and received between the controller 16 and the display device 14 will be described. First, the control side communication circuit 113 is connected to the control circuit 110 of the controller 16. The control signal generated by the control circuit 110 is supplied to the signal secondary coil 120 after being superimposed on the high frequency voltage by the control communication circuit 113. The high-frequency voltage on which the control signal is superimposed is generated by the control-side communication circuit 113, and the frequency varies depending on the data size of the control signal, the usage environment, and the like. In the form, it is appropriately set within a range of about 100 Hz to 10 GHz.

  When the high-frequency voltage is supplied to the signal secondary coil 120, a magnetic flux that passes through the signal secondary coil 120 and changes according to the output frequency is generated. The magnetic flux passing through the signal secondary coil 120 passes through the signal primary core 48 provided in the display device 14 from the signal secondary core 122 and is linked to the signal primary coil 46. As a result, an induced electromotive force is generated in the signal primary coil 46 due to the mutual induction action, and the high-frequency voltage supplied to the signal secondary coil 120 is extracted from the signal primary coil 46. In this way, the control signal transmitted from the control circuit 110 is transmitted from the signal secondary coil 120 to the signal primary coil 46 in a non-contact state. Then, the control signal superimposed on the high frequency voltage extracted from the signal primary coil 46 is extracted by the liquid crystal side communication circuit 36 and then transmitted to the drive circuit 32.

  Thereby, the drive circuit 32 displays the target image on the liquid crystal panel 24 by controlling the operation of the scan driver circuit 38 and the data driver circuit 40 based on the received control signal. In the present embodiment, since the cholesteric liquid crystal is used as the liquid crystal panel 24, even if the transmitter 102 is separated from the display device 14 and the supply of power to the display device 14 is stopped, the display contents are displayed. It is maintained.

  In the present embodiment, the control signal from the display device 14 to the controller 16 is transmitted, for example, when a control signal notifying that the rewriting of the liquid crystal panel 24 is completed is transmitted from the display device 14 to the controller 16. It is also possible to send. When the control information is transmitted from the display device 14 to the controller 16, the control signal generated by the drive circuit 32 is transmitted to the liquid crystal side communication, contrary to the case where the control information is transmitted from the controller 16 to the display device 14. The signal is superposed on the high frequency voltage in the circuit 36 and transmitted from the signal primary coil 46 to the signal secondary coil 120 through the signal primary core 48 and the signal secondary core 122 in a non-contact state. Later, the high frequency voltage is extracted by the control side communication circuit 113 and transmitted to the control circuit 110.

  Next, a transmission path of power supplied from the computer 18 to the display device 14 will be described. The control circuit 156 of the computer 18 selects at least one of the plurality of display devices 14 connected to the fence 84, and A program capable of designating the display contents of the selected display device 14 is stored, and the display device selection control circuit 160 is configured including such a program. In addition, the control circuit 156 of the computer 18 is electrically connected to the control-side communication circuit 152 of the control box 150, and the power supply circuit 158 of the computer 18 is electrically connected to the inverter 154 of the control box 150. Yes. The control side communication circuit 152 and the inverter 154 are electrically connected to the signal power secondary coil 92 provided on the fence 84.

  First, at least one display device 14 to be rewritten is selected on the screen of the computer 18 and the display content of the selected display device 14 is input. When the input is completed, the DC voltage supplied from the power supply circuit 158 is converted into a high frequency voltage by the inverter 154. Here, the frequency (output frequency) of the high-frequency voltage converted by the inverter 154 varies depending on the power to be supplied, the usage environment, etc., but in this embodiment, it is set appropriately within a range of about 100 Hz to 10 GHz. Has been.

  The high-frequency voltage converted by the inverter 154 is fed to the signal power secondary coil 92, thereby generating a magnetic flux that passes through the signal power secondary coil 92 and changes according to the output frequency. Here, in the present embodiment, the annular core 82 of each display control device 14 is inserted into the signal power secondary coil 92, so that the magnetic flux penetrating the signal power secondary coil 92 is each annular. It passes through the core 82. Each of the annular cores 82 forms a closed magnetic circuit, and the magnetic flux generated in the signal power secondary coil 92 is extrapolated to each of the annular cores 82. It will be linked to 78. As a result, an induced electromotive force is generated in the primary coil 78 for signal power of each display device 14 attached to the fence 84 due to the mutual induction action, and the high frequency supplied to the secondary coil 92 for signal power. The voltage is taken from the primary coil 78 for signal power.

  In this way, the power supplied from the power supply circuit 158 is transmitted from the signal power secondary coil 92 to the signal power primary coil 78 of each display device 14. In each display device 14, the high-frequency voltage extracted from the primary coil 78 for signal power is converted into a DC voltage by the rectifying and stabilizing circuit 34 and then supplied to the drive circuit 32 and the liquid crystal side communication circuit 36. The Thereby, the liquid crystal side communication circuit 36 and the drive circuit 32 of each display device 14 are made operable. Thus, in the present embodiment, a ring-type interface for feeding as a transmission interface is configured including the primary and secondary coils 78 and 92 for signal power and the annular core 82.

  Next, the transmission path of the control signal transmitted / received from the computer 18 to the display device 14 will be described. Each display device 14 is assigned a unique identification number that is not duplicated and can be rewritten on the screen of the computer 18. When at least one of the display devices 14 is selected, the display device selection control circuit 160 generates a display control signal including the identification number of the selected display device 14 and the input drive control information. The control signal generated by the display device selection control circuit 160 is supplied to the signal power secondary coil 92 after being superimposed on the high frequency voltage by the control side communication circuit 152. The high-frequency voltage on which the control signal is superimposed is generated by the control-side communication circuit 152, and the frequency varies depending on the data size of the control signal, the usage environment, and the like. In the form, it is appropriately set within a range of about 100 Hz to 10 GHz.

  When the high frequency voltage is supplied to the signal power secondary coil 92, a magnetic flux that passes through the signal power secondary coil 92 and changes according to the output frequency is generated. Here, in the present embodiment, the annular core 82 of each display control device 14 is inserted into the signal power secondary coil 92, so that the magnetic flux penetrating the signal power secondary coil 92 is each annular. It passes through the core 82. Each of the annular cores 82 forms a closed magnetic circuit, and the magnetic flux generated in the signal power secondary coil 92 is extrapolated to each of the annular cores 82. It will be linked to 78. As a result, an induced electromotive force is generated in the primary coil 78 for signal power of each display device 14 attached to the fence 84 due to the mutual induction action, and the high frequency supplied to the secondary coil 92 for signal power. The voltage is taken from the primary coil 78 for signal power.

  In this way, the control signal transmitted from the control circuit 156 is transmitted from the signal power secondary coil 92 to the signal power primary coil 78 of each display device 14. In each display device 14, the control signal superimposed on the high frequency voltage extracted from the signal power primary side coil 78 is extracted by the liquid crystal side communication circuit 36 and then transmitted to the drive circuit 32.

  In this case, the drive circuit 32 is provided with a control information acquisition circuit 162. The control information acquisition circuit 162 only detects the scan driver circuit 38 and the data driver based on the drive control information included in the display control signal only when the identification number included in the received display control signal is an identification number indicating itself. The liquid crystal panel 24 is rewritten by controlling the operation of the circuit 40. If the identification number included in the received display control signal is not an identification number indicating itself, the received display control signal is discarded. ing. Thereby, it is possible to update the display content of a specific display device 14 among the plurality of display devices 14. In short, after power is supplied to all the display devices 14 provided on the fence 84 and the drive circuits 32 of all the display devices 14 can be driven, display control signals are transmitted to all the display devices 14. . Each display device 14 performs an operation based on the drive control information included in the received display control signal only when the identification number included in the received display control signal is an identification number indicating itself. Has been. It is possible to include a plurality of identification numbers in the display control signal, and in this way, the plurality of display devices 14 can be rewritten simultaneously.

  In this way, a ring-type interface for control as a transmission interface is configured including the primary and secondary coils 78 and 92 for signal power and the annular core 82. That is, in the present embodiment, both the power ring-type interface and the control ring-type interface are configured by the common signal power primary and secondary coils 78 and 92 and the annular core 82.

  In the present embodiment, similarly to the signal primary coil 46 and the signal secondary coil 120 described above, the signal power primary coil 78 and the signal power secondary coil 92 are separated from the display device 14. It is also possible to transmit a control signal to the computer 18. When the control information is transmitted from the display device 14 to the computer 18, the control signal generated by the drive circuit 32 is used for liquid crystal side communication, contrary to the case where the control information is transmitted from the computer 18 to the display device 14. After being superimposed on the high frequency voltage by the circuit 36 and transmitted from the signal power primary side coil 78 to the signal power secondary side coil 92 via the annular core 82, it is extracted from the high frequency voltage by the control side communication circuit 152. Are transmitted to the control circuit 156.

  In the display device 10 having such a structure, the use of cholesteric liquid crystal as the liquid crystal panel 24 makes it unnecessary to always supply power in order to maintain display contents. Thereby, power saving of the display device 14 can be achieved.

  When the control signal is transmitted / received from the controller 16 or the computer 18 to the display device 14, driving power is supplied from the controller 16 or the computer 18 to the display device 14. Thereby, it is unnecessary to incorporate a power supply device in the display device 14, and the display device 14 can be configured more compactly. That is, in the display device 10 according to the present embodiment, the controller uses the characteristics of the cholesteric liquid crystal that requires power only at the time of rewriting to control the driving power necessary for the rewriting at the time of transmission / reception of the control signal at the time of rewriting. 16 and the computer 18 are supplied together with the display device 14 so that it is not necessary to incorporate a power supply device in the display device 14 and the display device 14 can be made compact.

  Furthermore, in this embodiment, when rewriting the display content of the display device 14, the display content of each display device 14 is individually rewritten using the controller 16, or a plurality of display devices 14 are simultaneously updated using the computer 18. It can be rewritten.

  When the display content of the display device 14 is rewritten using the controller 16, the secondary transmission terminal 118 of the controller 16 is opposed to the primary transmission terminal 30 of the display device 14 in a non-contact state. As a result, it is possible to supply power to the display device 14 and to transmit and receive control signals. This eliminates the need for physical connection such as a connector, and can reduce the risk of damaging the connection between the display device 14 and the controller 16 even by repeated rewriting. At the same time, the display device 14 and the controller 16 can be electrically connected only by positioning the primary-side transmission terminal 30 and the secondary-side transmission terminal 118 so that the degree of freedom of connection is increased. Can be easily connected. Particularly in the present embodiment, the signal primary and secondary cores 48 and 122 and the power primary and secondary cores 52 and 126 are both coaxially arranged using pot-type cores. Therefore, since these transmission / reception surfaces have a rotationally symmetrical shape, positioning of both transmission terminals 30 and 118 in the circumferential direction is unnecessary, and connection can be made more easily. Furthermore, the primary transmission terminal 30 has a convex cross section as a whole, and the secondary transmission terminal 118 has a concave cross section as a whole. It is also possible to easily perform alignment in the straight direction.

  In addition, particularly in the present embodiment, the opposing surfaces of the signal primary core 48 and the signal secondary core 122 and the opposing surfaces of the power primary core 52 and the power secondary core 126 are on different planes. It is located in. As a result, the influence of the electromagnetic wave transmitting the control signal and the electromagnetic wave transmitting the power on each other is reduced, and noise generation and power loss can be suppressed.

  In addition, when the display content of the display device 14 is rewritten using the computer 18, a predetermined display device 14 can be arbitrarily selected from the plurality of display devices 14 attached to the fence 84. Thereby, the display contents of the plurality of display devices 14 can be collectively controlled. At the same time, since power is supplied through the fence 84 when the display is updated, it is not necessary to incorporate a standby power source such as a battery in the display device 14 in order to receive the display control signal. Even when foodstuffs are displayed on the display 12, the display device 14 can be disposed in a sanitary manner in the vicinity of the foodstuffs.

  Note that the display device 14 in the present embodiment can also be suitably used in the manufacturing process of the display device 14 as shown in FIG. That is, in the manufacturing process of the display device 14, there are many opportunities to connect the display device 14 and the controller 16 that drives the display device 14 in order to check the operation. However, according to the display device 14 having the structure according to the present invention. For example, since the display device 14 and the controller 16 can be connected to each other in a non-contact state, the possibility of damage due to repeated physical connection such as connector connection is reduced. In particular, in the present embodiment, since the primary transmission terminal 30 of the display device 14 is exposed on the surface, the transmitter 102 is sequentially overlapped with each display device 14 flowing on the production line, thereby the display device 14. This inspection can be performed more easily.

  Next, FIG. 17 shows a display 200 as a second embodiment of the present invention. The display device 200 includes a display device 202 as a display device formed separately from each other, and display control that controls the operation of the display device 202 by supplying power to the display device 202 and transmitting and receiving control signals. And a controller 204 as a device. In the following description, members and parts having the same structure as in the first embodiment described above are denoted by the same reference numerals as those in the first embodiment in the drawings, and detailed description thereof is omitted. To do.

  More specifically, the liquid crystal module 206 shown in FIG. 18 is accommodated in the display device 202. The surface of the liquid crystal module 206 opposite to the surface shown in FIG. 18 has a substantially similar structure except that the primary-side transmission terminal 30 in the first embodiment is not provided. Illustration is omitted. On the other hand, on the surface opposite to the surface on which the liquid crystal panel 24 is provided, a drive circuit 32 for controlling the operation of the liquid crystal panel 24, a rectifying and stabilizing circuit 34 for supplying power to the liquid crystal panel 24, and a controller 204. A liquid crystal side communication circuit 36 for transmitting and receiving control signals to and from the controller 204 and various electronic components for transmitting and receiving power and control signals to and from the controller 204 are provided.

  Furthermore, a circular insertion hole 208 is provided in a thickness direction at a side end portion (in the present embodiment, the left end portion in FIG. 18) of the substrate 28. A primary coil 210 as a coil member on the display device side is formed outside the insertion hole 208 on the back surface of the substrate 28. The primary side coil 210 is formed by a conductive pattern printed on the back surface of the substrate 28, and is formed so as to make one round around the insertion hole 208.

  In the present embodiment, the conductor pattern forming the primary side coil 210 is the rectifying and stabilizing circuit 34 and the liquid crystal side communication similarly to the signal power primary side coil 78 (see FIG. 15) in the first embodiment. The circuit 36 and the like are electrically connected to various circuits provided on the substrate 28.

  As shown in FIG. 17, the storage case 212 that stores the liquid crystal module 206 has a circular opening 214 having the same diameter as the insertion hole 208 at a position overlapping the insertion hole 208 in the storage state of the liquid crystal module 206. Is penetrated in the thickness direction of the housing case 212 (in FIG. 17, the direction perpendicular to the paper surface). Thereby, in the accommodated state of the liquid crystal module 206, the insertion hole 208 and the opening 214 are connected, and the insertion hole 208 is opened on the front surface and the back surface of the display device 202.

  On the other hand, the controller 204 includes an input device 216 and a transmitter 218. The input device 216 has substantially the same structure as the input device 100 constituting the controller 16 in the first embodiment described above, and the power supply circuit 108 as a power supply circuit for supplying drive power to the display device 202 A control circuit 110 (see FIG. 15) as a control circuit for controlling the operation of the display device 202 based on input information from the input unit 104 is incorporated.

  Further, a transmitter 218 is connected to the input device 216 via a connection cable 219. FIG. 19 shows the transmitter 218. The transmitter 218 has a structure in which a secondary coil 236 is provided on an annular core 224.

  As shown in FIG. 19 (a), the annular core 224 as a whole has a cylindrical shape extending over the entire circumference with a constant rectangular cross section formed of a ferromagnetic material such as ferrite, for example, in the axial direction ( In FIG. 19, it has an annular shape when viewed in the direction perpendicular to the paper surface. Furthermore, the annular core 224 in the present embodiment is configured by combining a first partial core 234a and a second partial core 234b as core forming members that extend over a half circumference in the axial direction.

  Here, the second partial core 234b is provided with a secondary coil 236 as a coil member on the display control device side. The secondary coil 236 is formed by winding a lead wire made of, for example, copper or the like around the second partial core 234b a predetermined number of times. In this embodiment, the lead wire forming the secondary coil 236 is connected to the signal power secondary coil 92 (see FIG. 15) in the first embodiment via the connection cable 219. The control side communication circuit 113 and the inverter 111 are electrically connected.

  And as shown to Fig.19 (a), it is the 1st from the axial direction both sides with respect to the connection cylinder member 237 formed with conventionally well-known rubber materials, such as conventionally well-known synthetic resin materials, such as ABS, and natural rubber, for example. In addition, when the second partial cores 234a and 234b are detachably fitted into the closed state, the circumferential end faces 238a and 238b of the first partial core 234a and the circumferential end faces 240a and 240b of the second partial core 234b overlap each other. As a result, an annular closed magnetic path that is continuous over the entire circumference is formed, while the first and second partial cores 234a and 234b are removed from the connecting cylinder member 237 as shown in FIG. By setting the open state, the circumferential end surfaces 238a, 238b and 240a, 240b are separated from each other, and the closed magnetic circuit is cut off. To have.

  When updating the display of the display device 202, the display device 200 having such a structure, after inputting appropriate rewriting information to the controller 204, as shown in a model in FIG. One of the first and second partial cores 234a and 234b is inserted into the opening 214, and the other of the first and second partial cores 234a and 234b is assembled with the connecting cylinder member 237, whereby the annular core 224 is attached to the display device 202. Through the opening 214, the insertion hole 208 of the substrate 28 is inserted.

  Here, the opening size of the insertion hole 208 is larger than the rectangular cross section of the annular core 224, and the annular core 224 is extrapolated with a gap 242 to the insertion hole 208 and the primary coil 210. Accordingly, the annular core 224 has a member axis of the annular core 224 when considering the annular core 224 extending on the Z axis in the three-axis orthogonal coordinates of X, Y, and Z, as schematically shown in FIG. Assuming a primary coil 210 that is arranged in an extrapolated state on the Z axis extending in the vertical direction as a center and is laid flat on an XY plane that is a horizontal plane, the annular core 224 is , Movement is allowed in three directions, the vertical direction (Z-axis direction), the front-rear direction (Y-axis direction), and the left-right direction (X-axis direction), and the yaw around the Z-axis, the roll around the Y-axis, the X-axis It is assembled in a state where tilting or rotation is allowed in three directions of the surrounding pitch. The allowable amount of relative displacement in each direction can be set by appropriately adjusting the shape and size of the annular core 224, the primary coil 210 and the insertion hole 208, the size of the gap 242 and the like.

  In this manner, the annular core 224 is inserted through the insertion hole 208 and the primary coil 210. As a result, the annular core 224 is inserted into the primary side coil 210 and the secondary side coil 236, and the primary side coil 210 and the secondary side coil 236 are electromagnetically coupled. As a result, similarly to the display device 14 and the control box 150 in the first embodiment described above, the control signal and power can be transmitted between the display device 202 and the controller 204. In particular, in this embodiment, since the gap 242 is formed between the annular core 224 and the insertion hole 208, it is possible to transmit the control signal and power with the transmitter 218 in a non-contact state with respect to the display device 202. Has been. In addition, after the transmission of the control signal and the power is completed, the primary core is removed by removing one of the first and second partial cores 234a and 234b from the connecting cylinder member 237 and removing the annular core 224 from the insertion hole 208. The electromagnetic coupling between the side coil 210 and the secondary side coil 236 is released and the coils are separated from each other.

  In the display device 200 having the structure according to the present embodiment, when the display content of the liquid crystal panel 24 is rewritten, the first and second partial cores 234a and 234b of the transmitter 218 are connected by the connecting cylinder member 237. By inserting the annular core 224 through the opening 214 of the display device 202, power can be supplied to the display device 202 and control signals can be transmitted and received. Accordingly, the display device 202 and the controller 204 can be easily connected, and the display device 202 and the controller 204 can be electrically connected without being firmly fitted like a connector. Therefore, the possibility of damaging the connection portion even by repeated connection can be reduced. In particular, in the present embodiment, a gap 242 is formed between the annular core 224 and the insertion hole 214, and power and signals can be transmitted while the annular core 224 and the display device 202 are not in contact with each other. Therefore, the risk of damage during connection is greatly reduced.

  Further, the gap 242 is formed between the annular core 224 and the insertion hole 214 so that the primary side coil 210 and the secondary side coil 236 can be relatively displaced. As a result, the degree of freedom of connection between the display device 202 and the controller 204 is improved, and the connection can be made more easily. Furthermore, particularly in the present embodiment, both the control ring interface for transmitting the control signal and the ring interface for power supply for transmitting the power include the primary and secondary coils 210 and 236 and the annular core 224. It is constituted by. As a result, the display device 202 and the controller 204 can be made compact, and the control signal and power can be transmitted simply by assembling the single annular core 224 to the display device 202, thereby reducing the connection effort. ing.

  In addition, as shown in FIG. 22, the display device 200 having the structure according to the present embodiment can connect a plurality of display devices 202 to a single annular core 224. In this way, power and control information from one controller 204 can be simultaneously transmitted to a plurality of display devices 202, and a plurality of display devices 202 can be rewritten simultaneously. This makes it possible to inspect a plurality of display devices 202 collectively, particularly in a manufacturing process in which the operation of a large number of display devices 202 needs to be inspected. According to the display device 200 having the structure according to the present invention, the display device 202 and the controller 204 can be electrically connected by inserting the annular core 224 through the opening 214 of the display device 202. Further, fitting such as a connector is unnecessary, and the possibility of damage to the connection portion due to repeated insertion and removal is also reduced. Therefore, the possibility of damaging the connection portion can be reduced in the manufacturing process in which the opportunity to connect with the controller 204 increases in order to inspect the operation of the display device 202.

  As mentioned above, although several embodiment of this invention has been explained in full detail, these are illustrations to the last, Comprising: This invention is not limited at all by the specific description in this embodiment. .

  For example, in the first embodiment, the signal primary core 48 and the power primary core 52 in the primary transmission terminal 30 and the signal secondary core 122 and the power in the secondary transmission terminal 118 are used. The secondary core 126 for use is disposed concentrically with each other, and the end faces 56, 60, 130, and 134 are positioned on different planes. For example, the primary side core 126 shown in FIGS. Like the side transmission terminal 250 and the secondary side transmission terminal 252 shown in FIG. 26, the central axes of the cores 48, 52 and 122, 126 are made different, and the end faces 56, 60 and 130, 134 are the same. It may be positioned on a flat surface.

  Since the primary-side transmission terminal 250 and the secondary-side transmission terminal 252 in this aspect have substantially the same structure, the primary-side transmission terminal 250 will be described as an example. The first opening 258 and the second opening 260 are formed in one end face 256 and are formed in a substantially rectangular block shape. Then, the signal primary side core 48 and the power primary side core 52 having the same structure as that of the above-described embodiment are inserted into the first opening 258 and the second opening 260 via the gap members 72 and 74. It is assembled in the stowed state. In such a housing state, the end surface 56 of the signal primary core 48 and the end surface 60 of the power primary core 52 that are the transmitting and receiving surfaces are positioned on the same plane as the end surface 256 of the housing case 254.

  In addition, the secondary transmission terminal 252 is connected to the housing case 254 having the same structure as the primary transmission terminal 250, and the signal secondary core 122 and the power secondary core 126 are used for the primary transmission. The terminal 250 and the left and right sides (in the left and right directions in FIGS. 23 and 26) are disposed opposite to each other, and the end surface 130 of the signal secondary core 122 and the end surface 134 of the power secondary core 126 are used for primary transmission. The end face 56 of the signal primary side core 48 of the terminal 250 and the end face 60 of the power primary side core 52 are overlapped.

  As shown in FIG. 27, the primary side transmission terminal 250 and the secondary side transmission terminal 252 having such a structure are overlapped in a non-contact state spaced apart from each other, so that The end face 56 and the end face 130 of the signal secondary core 122 and the end face 60 of the power primary core 52 and the end face 134 of the power secondary core 126 are opposed to each other in a non-contact state. In this way, the axial dimension (the lateral dimension in FIG. 24) of the primary side transmission terminal 130 and the secondary side transmission terminal 132 can be reduced, and the primary side and secondary side transmission terminals. 250 and 252 can be easily overlapped.

  In particular, in this embodiment, the primary transmission terminal 250 is disposed on the back surface of the liquid crystal panel 24 with the substrate 28 interposed therebetween, and the end surface 256 of the housing case 254 is superimposed on the substrate 28, The end surface 56 of the primary side core 48 for power supply and the end surface 60 of the primary side core 52 for electric power are arrange | positioned toward the liquid crystal panel 24 side. The end surfaces 56 and 60 of the primary transmission terminal 250 are concealed by the liquid crystal panel 24 and the substrate 28. Thereby, in this aspect, the secondary side transmission terminal 252 is overlapped from the surface of the liquid crystal panel 24 so as to face the primary side transmission terminal 250 positioned behind the liquid crystal panel 24. It is like that. In this manner, the primary side and secondary side transmission terminals 250 and 252 can be positioned opposite to each other with the liquid crystal panel 24 interposed therebetween.

  Further, as shown in FIG. 28 as an example of the signal primary side core 48 and the signal primary side coil 46 in the first embodiment, the core member and the coil member may be detachable from the substrate 28. . In this embodiment, a bottomed cylindrical mounting bracket 262 that opens to one side is provided on the substrate 28. The signal primary side core 48 is detachably fitted into the opening of the mounting bracket 262, and the signal primary side coil 46 is detachably inserted into the signal primary side core 48. Connectors 264 and 264 are provided at the respective ends of the lead wires constituting the signal primary coil 46, and are fitted to the connectors 266 and 266 provided on the substrate 28, thereby being attached to the substrate 28. It is electrically connected to the provided electronic component. In addition, although the mounting bracket 262 shown in FIG. 28 has a bottomed shape, the bottom portion is not necessarily required, and for example, a cylindrical shape that opens on both sides in the axial direction may be adopted as the mounting bracket 262.

  This makes it easier to change or tune the core member and the coil member to appropriate ones according to the surrounding environment such as required transmission accuracy and electromagnetic noise. In this aspect, an embodiment in which the mounting bracket 262 is formed of a nonmagnetic material such as aluminum and the mounting bracket 262 is used as an electromagnetic shielding member is preferably employed. However, the electromagnetic shielding member is not necessarily required. . Therefore, as another aspect in which the core member is detachable, for example, the core member may be screwed to the substrate 28. Further, as apparent from this aspect, the gap member 72 in the above-described embodiment is not necessarily required, but of course, for example, the gap member 72 can be interposed between the signal primary core 48 and the mounting bracket 262. It is.

  In the embodiment, for example, the signal primary core 48 and the power primary core 52 in the primary transmission terminal 30 are accommodated in the common primary accommodation case 54 as an electromagnetic shielding member. The electromagnetic shielding member is not necessarily a single member, and an electromagnetic shielding member may be provided for each core member, and each core member may be covered with the electromagnetic shielding member separately.

  Further, as shown in FIG. 29 and FIG. 30 as an example of the signal primary side core 48 in the first embodiment described above, an insertion hole 270 penetrating in the thickness direction of the substrate 28 is formed, and the insertion hole It is also possible to insert the signal primary core 48 into the board 270 and fix it to the substrate 28. In this embodiment, the signal primary side coil 46 is formed by printed wiring on the surface of the substrate 28 opposite to the liquid crystal panel 24. Then, the signal primary side core 46 is inserted into the insertion hole 270 from the same side of the substrate 28 as the liquid crystal panel 24 toward the signal primary side coil 48 and protrudes to the opposite side of the liquid crystal panel 24. The signal primary coil 46 is accommodated in the lead groove 58 of the signal primary core 48. In this embodiment, a notch 272 is formed in a part of the outer peripheral wall portion of the lead groove 58 of the signal primary side core 48, and the printed wiring of the signal primary side coil 46 passes through the notch 272. It extends outside the side core 48.

  In FIG. 29, the end face 56 of the signal primary core 48 is positioned on the opposite side of the liquid crystal panel 24. For example, the signal primary core 48 is disposed on the substrate 28 from the opposite side of the liquid crystal panel 24. It is also possible to insert the end face 56 toward the liquid crystal panel 24 side. In this way, for example, the external appearance of the display device 14 can be improved by disposing the signal primary core 48 behind the liquid crystal panel 24 so that it cannot be visually recognized. At the same time, the secondary transmission terminal 118 provided on the controller 16 can be superimposed from the front of the liquid crystal panel 24 and superimposed on the primary transmission terminal 30 behind the liquid crystal panel 24. The primary side transmission terminal 30 and the secondary side transmission terminal 118 can be opposed to each other from the side, so that power and signals can be transmitted easily.

  In addition, for example, as schematically shown in FIG. 31, a plurality of (this book) are formed independently from each other between the signal power primary side coil 78 and the signal power secondary side coil 92 in the second embodiment described above. In the embodiment, two annular cores 280 and 282 may be connected. The annular cores 280 and 282 are connected to each other by winding the connecting coil 284 on both sides, and the connecting coil 284 is connected to any annular cores 280 and 282 by the current induced therein. It has come to be able to do. Further, particularly in this embodiment, the connecting coil member 284 has a gap between both the annular cores 280 and 282, and the connecting coil member 284 is connected to any of the annular cores 280 and 282 by the gap. Even relative displacement of 6 degrees of freedom is allowed. Thereby, the annular cores 280 and 282 are connected in a state in which they can be displaced relative to each other.

  In this aspect, for example, after an electrical signal is transmitted from the secondary coil 92 for signal power to the connecting coil member 284 by mutual induction, the electrical signal is transmitted from the connecting coil member 284 to the primary coil 78 for signal power. It is transmitted by mutual induction action. That is, the connecting coil member 284 is assembled to the two annular cores 280 and 282 in an electromagnetically coupled state. In this way, the plurality of annular cores 280 and 282 are disposed between the signal power primary side coil 78 and the signal power secondary side coil 92, and the plurality of annular cores 280 and 282 are connected to the coupling coil member. Since it is connected with a large degree of freedom by the H. 284, the degree of freedom of relative movement between the signal power primary side coil 78 and the signal power secondary side coil 92 can be further secured, and the display device 14 and the controller 16 can be connected more easily. The number of the annular cores disposed between the signal power primary side coil 78 and the signal power secondary side coil 92 is not necessarily limited to two, and the number of the annular cores may be two or more. Is also possible.

  Further, the annular core 280 in this aspect has a rectangular frame shape. Thus, the core member does not necessarily have an annular shape. On the other hand, the annular core 282 has a substantially rectangular frame shape as a whole, and a part of the circumference of the annular core 282 can maintain the substantial continuity of the magnetic path, in other words, the leakage of the magnetic flux is the power. In addition, a gap (gap) 286 that does not cause a problem in transmission of electrical signals is formed. In this way, for example, the signal power secondary coil 92 can be attached to and detached from the annular core 282 through the gap 286. As is clear from this, the annular core member does not necessarily have to be continuous in the circumferential direction.

  Furthermore, in the above-described embodiment, the connecting coil member 284 is wound around the pair of annular cores 280 and 282. However, the connecting coil member 284 is connected like the connecting coil member 288 shown in FIGS. The pair of annular cores 224 and 224 may be coupled by the coupling coil member 288 by winding both ends of the coil member 288 around the annular cores 224 and 224, respectively.

  Furthermore, although the display device in the first embodiment described above is used as a price tag for a product shelf, this is merely an example, and the use of the display device is not limited in any way. For example, as in the first embodiment, a longer frame and a coil assembled thereto may be formed, and such a frame may be disposed in a hospital, and the display device may be used as a name tag indicating a patient name in a hospital room. However, such a frame may be arranged in the station premises and the display device may be used as a timetable.

  The above-described fence 84 has a structure in which the secondary side coil 92 is attached to the frame-shaped frame 90 (see FIG. 10). For example, as shown in FIG. By winding the secondary coil 292 for signal power around the entire annular core 290 having a shape, the fence 84 is configured with the annular core and the secondary coil wound around the same. Alternatively, the primary coil 78 for signal power of the display device 14 may be directly wound. In this way, the signal power primary coil 78 provided on the display device 14 and the signal power secondary coil 292 provided on the fence 84 are connected via the annular core 290 constituting the frame of the fence 84. It will be electromagnetically coupled.

  Further, for example, as in the display device 294 shown in FIG. 35, it is of course possible to provide only the opposed interface similar to the primary-side transmission terminal 30 in the first embodiment described above. The display device 294 can be preferably used as a poster or the like.

  Furthermore, for example, in the first embodiment described above, the signal primary side core 48 and the signal secondary side core 122 which are opposed to each other and constitute the opposing type interface, or the power primary side core 52 and the power use core. The secondary core 126 has an inner diameter dimension and an outer diameter dimension that are substantially equal to each other, but these dimensions do not necessarily have to be equal to each other, and are different to the extent that transmission is not hindered. May be.

  In addition, in the first embodiment described above, the signal primary side core 48 and the power primary side core 52, and the signal secondary side core 122 and the power secondary side core 126 that constitute the opposed interface are: The magnetic paths of the signal primary side coil 46 and the power primary side coil 50, and the signal secondary side coil 120 and the power secondary side coil 124 do not interfere with each other. As such, it may be assembled to a common core member. In this way, the primary side and secondary side transmission terminals 30 and 118 can be configured more compactly.

  In each of the above-described embodiments, cholesteric liquid crystal is used as a display element and power necessary for rewriting is supplied by a transmission interface. However, the display element is not necessarily limited to cholesteric liquid crystal. Instead, for example, a power supply may be built in the display device, and a nematic liquid crystal, LED, or the like that has been widely used as a display element may be used.

Explanatory drawing which shows the indicator as 1st embodiment of this invention. Explanatory drawing which shows the display apparatus which comprises the display. Explanatory drawing which shows schematically the front of the liquid crystal module provided in the display apparatus. Explanatory drawing which shows the back surface of the liquid crystal module roughly. The front view which shows schematically the coil head provided in a display apparatus. Explanatory drawing equivalent to the VI-VI cross section in FIG. FIG. 3 is an explanatory view showing an upper surface of the display device shown in FIG. 1. Explanatory drawing equivalent to the VIII-VIII cross section in FIG. Cross-sectional explanatory drawing which shows a cyclic | annular core member roughly. Explanatory drawing for demonstrating the flame | frame which comprises the fence shown in FIG. Explanatory drawing which shows the front of a transmitter roughly. The front view which shows schematically the coil head provided in a display control apparatus. Explanatory drawing equivalent to the XIII-XIII cross section in FIG. FIG. 14 is an explanatory cross-sectional view schematically showing a state in which the coil heads shown in FIGS. 6 and 13 are overlapped. The block diagram which shows a display apparatus schematically. Explanatory drawing for demonstrating the usage example of a display. Explanatory drawing which shows the indicator as 2nd embodiment of this invention. Explanatory drawing which shows roughly the back surface of the liquid crystal module provided in the display apparatus which comprises the display. Explanatory drawing which shows roughly the transmitter provided in a display control apparatus. Cross-sectional explanatory drawing for demonstrating the assembly | attachment state of a coil member and an annular core member. Explanatory drawing for demonstrating the relative displacement freedom degree of the cyclic | annular core member with respect to a coil member. Explanatory drawing for demonstrating the usage example of a display. The front view which shows schematically the different aspect of the coil head provided in a display apparatus. Explanatory drawing equivalent to the XXIV-XXIV cross section in FIG. Explanatory drawing equivalent to the XXV-XXV cross section in FIG. The front view which shows schematically the aspect from which the coil head provided in a display control apparatus differs. FIG. 27 is an explanatory cross-sectional view schematically showing a state in which the coil heads shown in FIGS. Explanatory drawing for demonstrating the different aspect of a core member and a coil member. It is explanatory drawing for demonstrating the further different aspect of a core member and a coil member, Comprising: Explanatory drawing equivalent to the XXIX-XXIX cross section of FIG. Explanatory drawing for demonstrating the further different aspect of a core member and a coil member. Explanatory drawing for demonstrating the different aspect of an annular core member. Explanatory drawing for demonstrating the different aspect of a connection coil member. FIG. 33 is an explanatory top view of FIG. 32. Explanatory drawing for demonstrating the different aspect of the fence shown in FIG. Explanatory drawing for demonstrating the different use of a display apparatus.

Explanation of symbols

10: display, 14: display device, 16: controller, 18: computer, 24: liquid crystal panel, 30: primary side transmission terminal, 32: drive circuit, 46: primary coil for signal, 48: primary side for signal Core: 50: Primary coil for power, 52: Primary core for power, 56: End face, 60: End face, 78: Primary coil for signal power, 82: Ring core member, 92: Secondary coil for signal power 108: power supply circuit 110: control circuit 118: secondary transmission terminal 120: signal secondary coil 122: signal secondary core 124: power secondary coil 126: power Secondary side core, 130: end face, 134: end face

Claims (13)

  A display device including a display element and a display element drive circuit, a control circuit that transmits and receives display control signals between the display device and the drive circuit of the display device, and a power supply circuit that supplies power The display control device is formed separately from each other, and a pair of coil members that can be separated from each other are connected to the core member in an electromagnetically coupled state by using electromagnetic induction. And a transmission interface for transmitting and receiving at least one of the signals, wherein one of the pair of coil members in the transmission interface is mounted on the display device and the other is mounted on the display control device. Indicator.   The display according to claim 1, wherein a cholesteric liquid crystal is used as the display element.   3. The device according to claim 1, wherein at least one of the coil member and the core member attached to at least one of the display device and the display control device is detachable from the display device or the display control device. The indicated indicator.   The display according to claim 1, wherein an electromagnetic shielding member is disposed around the core member.   The display according to any one of claims 1 to 4, wherein a low magnetic permeability member is disposed around the core member.   Using a pair of coil heads in which the core member is combined with the coil member to form a magnetic path around the coil member, a transmission / reception surface composed of the open surface of the magnetic path formed by the core members is mutually connected. The display according to any one of claims 1 to 5, wherein the transmission interface is configured to include an opposing interface that transmits and / or receives at least one of electric power and a signal by using electromagnetic induction action by being opposed to each other. .   The display device according to claim 6, wherein an insulating substrate including the display element is provided in the display device, and the core member is disposed on a side of the insulating substrate opposite to the display element.   At least one of the display device and the display control device is provided with an insulating substrate provided with the coil member, and the insulating substrate is formed with an insertion hole through which the core member is inserted. The display device according to claim 6 or 7, wherein a projection is projected toward the coil member through the insertion hole from the side opposite to the coil member on the insulating substrate.   By combining a pair of the coil members and an annular core member that couples the coil members in an electromagnetically coupled state, the annular core member is removably assembled to at least one of the pair of coil members to achieve electromagnetic induction action. The display according to any one of claims 1 to 5, wherein the transmission interface is configured to include a ring-type interface that transmits and receives at least one of electric power and signals.   The display according to claim 9, wherein a plurality of the annular core members are provided between the pair of coil members.   The indicator according to claim 9 or 10, wherein the annular core member is openable and closable so as to form a closed magnetic path in a closed state and to cut the closed magnetic path in an open state.   The coil member attached to each of the plurality of display devices is connected to the coil member attached to the display control device in an electromagnetically coupled state, so that at least one of power and signals can be transmitted and received. 12. A display device according to any one of claims 9 to 11, wherein the display device is configured as described above.   Identification information for designating at least one of the plurality of display devices and drive control information for designating operation contents of the drive circuit in the display device corresponding to the identification information are provided to the control circuit in the display control device. While a display device selection control circuit that includes and transmits the display control signal is provided, the drive circuit in the display device determines whether the identification information included in the display control signal is identification information indicating itself A control information acquisition circuit is provided for driving the display element based on the drive control information included in the display control signal when the identification information is identification information indicating itself. The indicator as described in.

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