JP2009134191A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device of a new construction capable of reducing a running cost, and reducing the risk of a physical damage when updating a display content, and further capable of advantageously coping with the model change of a display device or a controller. <P>SOLUTION: The liquid crystal display device 12 with a cholesteric liquid crystal element 20, and a display controller 14 for transmitting electric power and a control signal between itself and the liquid crystal display device 12 are formed as separate units independently of each other. Coil heads 38, 39 on one side in a counter type interface for control performing signal transmission and reception by using an electromagnetic induction effect are mounted on the liquid crystal display device 12, and coil heads 84, 82 on the other side are mounted on the display controller 14. In the meantime, coil heads 40, 41 on one side are mounted on the liquid crystal display device 12 and coil heads 85. 87 on the other side are mounted on the display controller 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a display device using liquid crystal, and more particularly to a display device using cholesteric liquid crystal.

  Conventionally, a liquid crystal display has been widely used as a display device for displaying various numbers, characters, and figures. Since liquid crystal displays can be made thinner and smaller than cathode ray tubes, they have recently been used not only for televisions but also for station advertisements, timetables, supermarket price tags, and name tags indicating patient names in hospital rooms. It is being considered.

  By the way, many liquid crystal displays use nematic liquid crystals. Such a liquid crystal display generally has its optical properties by changing the alignment state of liquid crystal molecules by applying a voltage to a nematic liquid crystal sandwiched between at least one transparent electrode plate. Is going to change. In the nematic liquid crystal, when the voltage is removed, the molecular alignment state is restored to the original state. Therefore, in order to maintain the display contents, the voltage must always be applied to the liquid crystal. Therefore, it is necessary to always supply power from the outside of the liquid crystal display or to incorporate a power source such as a solar cell as described in Patent Document 1, for example, and the display content is not frequently updated as described above. It was uneconomical to apply to advertisements and name tags.

  Therefore, in recent years, cholesteric liquid crystals capable of retaining display contents even when power supply is stopped are being put into practical use. Cholesteric liquid crystal has a molecular structure different from that of nematic liquid crystal, and no voltage is applied to either the focal conic state that transmits light on the screen or the planar state that reflects specific light (wavelength selective reflection). However, it has stable bistability. This makes it possible to retain the display contents without supplying power, and it can be suitably used for the above-mentioned advertisements and name tags that do not frequently rewrite.

  However, even in the cholesteric liquid crystal, electric power is required to rewrite the display contents. Therefore, when rewriting the display contents, as disclosed in, for example, Patent Document 2 and Patent Document 3, a display device having liquid crystal and a control device for controlling the operation of the display device are connected by a connector to thereby save power. The display contents are rewritten by transmitting a control command using serial communication or the like.

  However, if the connector is inserted or removed during such rewriting, an excessive force may be applied to the connector and the connector may be damaged. In particular, in the manufacturing process, the number of times the connector is inserted / removed in order to inspect whether normal rewriting can be performed increases, and there is a higher possibility that the connector will be damaged. In addition, when the connector shape of either the display device or the control device is changed, the other connector must be replaced, and it is difficult to cope with various types of connectors.

JP-A-8-160386 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 that the running cost can be reduced and physical damage in updating the display contents can be reduced. Another object of the present invention is to provide a display device having a novel structure that can reduce the fear and can advantageously cope with a change in the model of the display device or the control device.

  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, the first aspect of the present invention provides a display control signal between a cholesteric liquid crystal element and a liquid crystal display device including the drive circuit for the cholesteric liquid crystal element, and the drive circuit of the liquid crystal display device. A display control device configured to include a control circuit for transmitting and receiving and a power supply circuit for supplying power are formed independently of each other, and the first coil member is combined with the first core member. Using a pair of first coil heads in which a magnetic path is formed around one coil member, the transmitting and receiving surfaces formed by the respective first core members and made of the open surface of the magnetic path are positioned opposite to each other. And a pair of first coil heads in the control facing interface configured to transmit and receive signals using electromagnetic induction. One is attached to the liquid crystal display device and the other is attached to the display control device, while a second core member is combined with the second coil member to form a magnetic path around the second coil member. Using a pair of two coil heads, power transmission / reception is performed using electromagnetic induction by positioning the transmission / reception surfaces formed by the open surfaces of the magnetic paths formed by the second core members to face each other. A cholesteric liquid crystal display device comprising a power-fed opposed interface, wherein one of the pair of second coil heads in the power-fed opposed interface is mounted on the liquid crystal display device and the other is mounted on the display control device. is there.

  In the cholesteric liquid crystal device having the structure according to this aspect, since the cholesteric liquid crystal is employed as the display element, 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.

  By providing the control facing interface for transmitting and receiving signals and the power feeding facing interface for transmitting and receiving power, both the signal and power can be transmitted simultaneously from the display control device to the liquid crystal display device. Accordingly, power is supplied to a liquid crystal display device having a cholesteric liquid crystal that requires power only when the display content is rewritten, in other words, only when the signal that requires power is transmitted and received, in other words, only when the display content is rewritten. This enables efficient power supply. This not only saves power in the liquid crystal display, but also eliminates the need for a built-in power supply device such as a storage battery in the liquid crystal display, thereby simplifying the circuit configuration of the liquid crystal display. Thus, the manufacturing can be facilitated and the liquid crystal display device can be made compact. That is, in the cholesteric liquid crystal display device having the structure according to the present embodiment, information is displayed on the liquid crystal display device by taking advantage of the characteristics of the cholesteric liquid crystal that does not require power supply except when rewriting display contents. For this reason, the display control device is provided with a minimum necessary configuration, and is provided with a control circuit and a power supply circuit in a display control device formed independently of the liquid crystal display device, and the control circuit and the power supply circuit are separated from the liquid crystal display device. Thus, the liquid crystal display device can be made compact and power-saving.

  Further, particularly in the cholesteric liquid crystal display device according to this embodiment, the liquid crystal display device and the display control device are formed separately from each other, and the transmission / reception surfaces formed by the core member of the coil head are positioned opposite to each other. Thus, transmission and reception of power and signals can be performed in a non-contact state without physically connecting the display control device and the liquid crystal display device. Therefore, it is possible to avoid the possibility of physical damage during insertion / removal, such as connector connection. In addition, by eliminating the need for a connector, it is possible to respond more flexibly to changes in the shape of the core member and the coil member, and the liquid crystal display device or display control device can be changed in model. Even if it occurs, it can respond more flexibly. In addition, since the electrical connection can be performed simply by facing the transmitting and receiving surfaces of the core members in a non-contact state, the degree of freedom in connection is improved, and the electrical connection between the liquid crystal display device and the display control device is improved. Connection can also be made easier.

  According to a second aspect of the present invention, in the cholesteric liquid crystal display device according to the first aspect, the core member constituting the coil head in at least one of the control facing interface and the power feeding facing interface, and At least one of the coil members is detachable from the liquid crystal display device or the display control device on which the coil head is mounted.

  In the cholesteric liquid crystal display device having a structure according to this aspect, the core member and the coil member can be easily replaced. This makes it easier to change or tune the core and coil members to appropriate ones according to the surrounding environment such as the required signal and power transmission and reception accuracy and size, or electromagnetic noise. At the same time, it is possible to respond more flexibly to changes in the shape of the core member and coil member.

  According to a third aspect of the present invention, in the cholesteric liquid crystal display device according to the first or second aspect, the transmission / reception surface of at least one of the first core member and the second core member is excluded. An electromagnetic shielding member is disposed on the outer periphery. According to this aspect, it is possible to suppress the influence of electromagnetic waves generated from the coil head 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.

  A fourth aspect of the present invention is the cholesteric liquid crystal display device according to any one of the first to third aspects, wherein the transmission / reception in at least one of the first core member and the second core member is performed. A low-permeability member is disposed on the outer periphery excluding the surface. 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 cholesteric liquid crystal display device according to the third aspect, an aspect in which a low magnetic 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 fifth aspect of the present invention, in the cholesteric liquid crystal display device according to any one of the first to fourth aspects, the first coil head and the first coil head in each of the liquid crystal display device and the display control device. The two coil heads are arranged on a concentric shaft.

  According to this aspect, the first and second pair of coil heads can be arranged in a space-efficient manner, and the liquid crystal display device and the display control device can be further downsized. At the same time, the positioning of the coil heads provided in the liquid crystal display device and the display control device in the circumferential direction is not necessary, so that the coil heads can be more easily aligned when rewriting the display contents. Thus, the rewriting work efficiency can be improved.

  According to a sixth aspect of the present invention, in the cholesteric liquid crystal display device according to any one of the first to fifth aspects, the transmission / reception surface of the first core member and the transmission / reception surface of the second core member are the same. It is characterized by being positioned on a plane. According to this aspect, the first and second core members provided in the liquid crystal display device and the display control device can be easily positioned to face each other.

  According to a seventh aspect of the present invention, in the cholesteric liquid crystal display device according to any one of the first to fifth aspects, the transmission / reception surface of the first core member is different from the transmission / reception surface of the second core member. It is characterized by being positioned on a plane.

  According to this aspect, the electromagnetic induction effect generated between the first core members by shifting the positions at which the first core member that performs signal transmission and reception and the second core member that performs power transmission and reception are opposed to each other. And the influence of the electromagnetic induction effect generated between the second core member on the other can be reduced. Thus, transmission power loss and signal noise can be suppressed, and more stable transmission / reception can be performed.

  According to an eighth aspect of the present invention, in the cholesteric liquid crystal display device according to any one of the first to fourth aspects, the first coil head and the second coil head have a common core member and coil member. It is characterized by comprising. According to this aspect, the liquid crystal display device and the display control device can be further downsized by configuring the first coil head and the second coil head with a single core member and a coil member.

  According to a ninth aspect of the present invention, in the cholesteric liquid crystal display device according to any one of the first to eighth aspects, at least one of the first core member and the second core member is a pot. It is characterized by being a mold core. According to this aspect, by generating magnetic flux on the central axis of the pot-type core, it is possible to stably link the magnetic flux to the coil on the receiving side. Thereby, more stable transmission and reception of signals and power can be performed. This aspect is particularly preferably used in combination with the fifth aspect. That is, as the first and second core members, a pot-type core that does not require circumferential alignment is used, and the first and second core members are disposed on the concentric shaft, thereby providing a liquid crystal display. Since it is not necessary to align the coil heads provided in each of the device and the display control device in the circumferential direction, the work efficiency of rewriting the cholesteric liquid crystal element can be improved.

  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 cholesteric liquid crystal display device 10 as a first embodiment of the present invention. The cholesteric liquid crystal display device 10 operates the liquid crystal display 12 by supplying power to the liquid crystal display 12 and transmitting / receiving a control signal to the liquid crystal display 12 as a display device formed separately from each other. And a controller 14 as a display control device for controlling the display.

  More specifically, a liquid crystal module 16 shown in FIGS. 2 and 3 is accommodated in the liquid crystal display 12. In the liquid crystal module 16, a liquid crystal panel 20 as a cholesteric liquid crystal element is provided on one surface of an insulating substrate 18 made of, for example, silicon, and the liquid crystal panel 20 is disposed on the opposite surface of the liquid crystal panel 20. A drive circuit 22 for controlling the operation of the liquid crystal display 20, a rectifying and stabilizing circuit 24 for supplying power to the liquid crystal panel 20, a liquid crystal side communication circuit 26 for transmitting and receiving control signals to and from the controller 14, and Various electronic components such as a primary transmission terminal 28 for transmitting and receiving power and control signals to and from the controller 14 are provided. In the following description, unless otherwise specified, the front surface refers to the surface on which the liquid crystal panel 20 is provided, and the back surface and the back surface refer to surfaces opposite to the liquid crystal panel 20.

  The liquid crystal panel 20 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 20 includes a scan driver circuit 30 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 32 for applying a voltage is connected. The scan driver circuit 30 and the data driver circuit 32 are electrically connected to a flat cable 34, and the flat cable 34 wraps around the substrate 18 and is provided on the surface of the substrate 18 opposite to the liquid crystal panel 20. By being connected to the connector 36, the drive circuit 22 and the like are electrically connected.

  Further, a primary transmission terminal 28 is provided on the surface of the substrate 18 opposite to the liquid crystal panel 20. 4 and 5 show the primary-side transmission terminal 28. FIG. The primary transmission terminal 28 includes a signal primary core 39 as a first core member around which a signal primary coil 38 as a first coil member is wound, and power as a second coil member. A power primary side core 41 as a second core member around which the primary coil 40 is wound is housed in a housing case 42.

  The signal primary core 39 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 43 in the axial direction (rightward in FIG. 5). A lead groove 44 is formed over the entire circumference. The signal primary coil 38 is formed by winding a lead wire formed of copper or the like in the lead groove 44 a predetermined number of times. Thereby, in this embodiment, the signal primary side core 39 and the signal primary side coil 38 constitute a first coil head on the liquid crystal display 12 side, and the signal primary side core 39 is used for signal. The magnetic path of the primary side coil 38 is formed, and the end face 43 of the signal primary side core 39 is used as a transmission / reception surface. Note that the number of turns of the signal primary coil 38 can be set as appropriate in consideration of required transmission characteristics and the like. For example, the signal primary side coil 38 may be wound only around a half circumference of the lead groove 44, or the signal primary side coil 38 may be wound in layers in the lead groove 44 so that there is almost no gap. You may do it.

  On the other hand, the power primary core 41 is a so-called pot-shaped core formed of a ferromagnetic material such as ferrite and having a substantially annular shape, and has one end face 46 in the axial direction (right direction in FIG. 5). A lead groove 48 is formed over the entire circumference. Here, the inner diameter dimension of the power primary side core 41 is larger than the outer diameter dimension of the signal primary side core 39. Then, a lead wire formed of copper or the like in the lead groove 48 is wound a predetermined number of times, whereby the power primary coil 40 is formed. Thus, in the present embodiment, the power primary side core 41 and the power primary side coil 40 constitute a second coil head on the liquid crystal display 12 side. The magnetic path of the primary side coil 40 is formed, and the end surface 46 of the power primary side core 41 is used as a transmission / reception surface. The number of turns of the power primary coil 40 can be set as appropriate in consideration of required transmission characteristics and the like. For example, the primary coil for power 40 may be wound only around a half circumference of the lead groove 48, or the primary coil for power 40 may be wound in layers so that there is almost no gap in the lead groove 48. You may do it.

  The signal primary side core 39 and the power primary side core 41 are assembled to the primary side accommodation case 42 in the accommodated state. The primary housing case 42 is made of a nonmagnetic material such as aluminum or copper, for example, and has a small diameter portion 50 formed on one side of an intermediate portion in the axial direction (left and right direction in FIG. 5) and the other side. The large-diameter portion 52 having a diameter larger than that of the small-diameter portion 50 is formed on the concentric shaft so that the small-diameter portion 50 protrudes from the center of the large-diameter portion 52 as a whole and has a stepped cylindrical shape. ing.

  Further, a circular first opening 54 that opens to the protruding tip surface is formed in the small diameter portion 50 of the primary side accommodation case 42, while the large diameter portion 52 is on the side where the small diameter portion 50 is formed. An annular second opening 56 having an inner diameter larger than that of the small diameter portion 50 is formed in the end face. The signal primary core 39 is accommodated in the first opening 54, while the power primary core 41 is accommodated in the second opening 56. In such an accommodation state, the signal primary core 39 and the power primary core 41 are disposed on the concentric shaft, and the outer peripheral portions excluding the end faces 43 and 46 serving as the transmission / reception surfaces are respectively provided in the primary accommodation case 42. It is supposed to be covered. As a result, an electromagnetic shielding structure is configured by the primary housing case 42, and the magnetic lines of force that leak from the signal primary core 39 and the power primary core 41 affect each electronic component provided on the substrate 18. In addition, the possibility that the lines of magnetic force from the respective electronic components provided on the substrate 18 affect the electromagnetic induction action of the signal primary side core 39 and the power primary side core 41 is reduced.

  Further, particularly in the present embodiment, gap members 58 and 60 as low magnetic permeability members are interposed between the primary side core 39 for signals and the primary side core 41 for power and the primary side accommodation case 42. In addition, the outer peripheral surfaces of both the cores 39 and 41 excluding the end surfaces 43 and 46 serving as the transmitting and receiving surfaces are covered with the gap members 58 and 60. Here, as the gap members 58 and 60, conventionally known members having a small relative magnetic permeability can be appropriately employed, and specific examples thereof include polytetrafluoroethylene and epoxy resin. More preferably, as the gap members 58 and 60, non-conductive members are employed. In the present embodiment, polytetrafluoroethylene is used as the gap members 58 and 60. As a result, the leakage magnetic flux from both the cores 39 and 41 is suppressed, and the eddy current is also prevented from being generated in the primary housing case 42 due to the influence of the magnetic lines of force. The risk of reducing energy is also reduced.

  Such primary-side transmission terminals 28 are disposed at the corners of the back surface of the substrate 18. Then, as shown in FIG. 6, the signal primary core 39 and the power primary core 41 are respectively provided through the opening 62 formed in the back case 61 that covers and accommodates the liquid crystal module 16 from the opposite side of the liquid crystal panel 20. End surfaces 43 and 46 serving as transmission / reception surfaces are exposed on the back surface of the liquid crystal module 16.

  On the other hand, the controller 14 has a structure in which a transmitter 66 is connected to the input device 64. The input device 64 includes an input unit 68 configured by a keyboard and buttons that can input numerical values and characters, and a display unit 70 configured by a liquid crystal display panel that can display input contents and various information.

  The input device 64 is supplied with drive power for the input device 64 and also supplied from the power supply circuit 72 (see FIG. 11) as a power supply circuit for supplying drive power to the liquid crystal display 12 and from the input unit 68. A control circuit 74 (see FIG. 11) is incorporated as a control circuit for controlling the operation of the liquid crystal display 12 based on the input information.

  Furthermore, a transmitter 66 is connected to the input device 64 via a connection cable 76. As shown also in FIG. 7, the transmitter 66 has a grip portion 78 having a substantially rod shape, and a connection cable 76 extends from one end of the grip portion 78. At the other end, an opening 80 is formed that is bent at a substantially right angle from the extending direction of the gripping portion 78 (vertical direction in FIG. 7) and the tip is opened. The secondary transmission terminal 82 is exposed in the opening 80.

  8 and 9 show the secondary side transmission terminal 82. The secondary transmission terminal 82 includes a signal secondary core 85 as a first core member around which a signal secondary coil 84 as a first coil member is wound, and a second coil member. A power secondary core 87 as a second core member around which the power secondary coil 86 is wound is housed in a secondary housing case 88.

  The signal secondary core 85 is a so-called pot-shaped core made of a ferromagnetic material such as ferrite and having a substantially annular shape, and has one end face 89 in the axial direction (leftward in FIG. 9). A lead groove 90 is formed over the entire circumference. A signal secondary coil 84 is formed by winding a lead wire formed of copper or the like in the lead groove 90 a predetermined number of times. Thereby, in this embodiment, the signal secondary side core 85 and the signal secondary side coil 84 constitute a first coil head on the controller 14 side, and the signal secondary side core 85 provides a signal. The magnetic path of the secondary coil for signal 84 is formed, and the end surface 89 of the secondary core for signal 85 is used as a transmission / reception surface. The number of turns of the signal secondary coil 84 can be appropriately set in consideration of the required transmission characteristics and the like. For example, the signal secondary side coil 84 may be wound only around a half circumference of the lead groove 90, or the signal secondary side coil 84 may be overlapped in the lead groove 90 so that there is almost no gap. You may wind.

  On the other hand, the power secondary core 87 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. 9). A lead groove 92 opened in the end face 91 is formed over the entire circumference. Here, the inner diameter of the power secondary core 87 is larger than the outer diameter of the signal secondary core 85. Then, a lead wire formed of copper or the like in the lead groove 92 is wound a predetermined number of times, whereby the power secondary coil 86 is formed. Thus, in the present embodiment, the power secondary side core 87 and the power secondary side coil 86 constitute a second coil head on the controller 14 side. A magnetic path of the secondary coil for power 86 is formed, and an end surface 91 of the secondary core for power 87 is used as a transmission / reception surface. The number of turns of the power secondary coil 86 can be set as appropriate in consideration of required transmission characteristics and the like. For example, the power secondary coil 86 may be wound only around a half circumference of the lead groove 92, or the power secondary coil 86 may be stacked in the lead groove 92 several times so that there is almost no gap. You may wind.

  The signal secondary core 85 and the power secondary core 87 are assembled to the secondary storage case 88 in the storage state. The secondary housing case 88 is made of a nonmagnetic material such as aluminum or copper, for example, and an opening 94 is formed in the central portion that opens on one end surface 93 in the axial direction (leftward in FIG. 9). The whole has a substantially bottomed cylindrical shape.

  Furthermore, a circular first opening 96 that opens to the bottom surface 95 is formed in the opening 94 of the secondary side accommodation case 88, while an annular shape that opens to the end surface 93 is formed outside the opening 94. The second opening 97 is formed. A signal secondary core 85 is accommodated in the first opening 96, while a power secondary core 87 is accommodated in the second opening 97. In such an accommodation state, the signal secondary side core 85 and the power secondary side core 87 are disposed on the concentric shaft, and the outer peripheral portions excluding the end faces 89 and 91 serving as the transmitting and receiving surfaces are respectively accommodated on the secondary side. The case 88 is covered. As a result, an electromagnetic shielding structure is configured by the secondary housing case 88, and magnetic lines that leak from the signal secondary core 85 and the power secondary core 87 are generated in other electronic components provided in the controller 14. The possibility that the magnetic field lines from the respective electronic components provided in the controller 14 influence the electromagnetic induction action of the signal secondary core 85 and the power secondary core 87 is reduced.

  Further, particularly in the present embodiment, gap members 98 and 99 as low permeability members are interposed between the signal secondary core 85 and the power secondary core 87 and the secondary housing case 88. I'm hurt. The gap members 98 and 99 have substantially the same structure as the gap members 58 and 60 described above, and both the cores 85 and 87 have outer circumferential surfaces other than the end surfaces 89 and 91 serving as transmission and reception surfaces by the gap members 98 and 99. Covered. As a result, the leakage magnetic flux from both the cores 85 and 87 is suppressed, and the generation of eddy currents in the secondary housing case 88 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-side transmission terminal 82 is electrically connected to the power supply circuit 72 and the control circuit 74 provided in the input device 64 via the connection cable 76, and the transmitter 66 through the opening 80. It is exposed outside.

  In the cholesteric liquid crystal display device 10 having such a structure, when updating the display contents of the liquid crystal display 12, as shown in FIG. 10, after inputting appropriate rewrite information to the controller 14, the liquid crystal display The primary-side transmission terminal 28 and the secondary-side transmission terminal 82 are inserted into the opening 94 of the secondary-side transmission terminal 82 of the controller 14 so that the small-diameter portion 50 of the primary-side transmission terminal 12 is inserted into the opening 94 of the secondary-side transmission terminal 82 of the controller 14. Are superimposed. As a result, the end face 43 of the signal primary side core 39 and the end face 89 of the signal secondary side core 85 are opposed to each other in a slightly non-contact state, and the signal primary side coil 38 and the signal secondary side The side coil 84 is electromagnetically coupled, and the end surface 46 of the power primary core 41 and the end surface 91 of the power secondary core 87 are opposed to each other in a non-contact state with a slight separation therebetween, so that the power primary coil 40 and the power secondary coil 86 are electromagnetically coupled. As a result, the control signal and power can be transmitted between the liquid crystal display 12 and the controller 14 in a non-contact state. Thus, in this embodiment, the control primary interface is configured by the signal primary coil 38, the signal primary core 39, the signal secondary coil 84, and the signal secondary core 85. In addition, the power primary side coil 40, the power primary side core 41, the power secondary side coil 86, and the power secondary side core 87 constitute an opposing interface for power feeding. Here, particularly in the present embodiment, the primary-side storage case 42 has a convex cross section as a whole, while the secondary-side storage case 88 has a concave cross section as a whole. 39 and the end faces 43 and 89 of the signal secondary core 85 and the end faces 46 and 91 of the power primary core 41 and the power secondary core 87 are opposed to each other on different planes. . In FIG. 10, the end surfaces 43 and 46 of the primary side transmission terminal 28 and the end surfaces 89 and 91 of the secondary side transmission terminal 82 are slightly separated from each other. Although the control signal and the power can be transmitted in the contact state, the end faces 43, 89 and 46, 91 may be brought into contact with each other.

  Next, a transmission path of power supplied from the controller 14 to the liquid crystal display 12 will be described with reference to FIG. First, the inverter 104 is connected to the power supply circuit 72 of the controller 14. As the inverter 104, for example, a conventionally known inverter of CVCF type or VVVF type can be appropriately employed. The DC voltage of the power supply circuit 72 is converted into a high frequency voltage by the inverter 104. Here, the frequency (output frequency) of the high-frequency voltage converted by the inverter 104 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 500 MHz. Has been.

  The high-frequency voltage converted by the inverter 104 is fed to the power secondary coil 86, thereby generating a magnetic flux that passes through the power secondary coil 86 and changes according to the output frequency. The magnetic flux passing through the power secondary coil 86 passes through the power primary core 41 provided in the liquid crystal display 12 from the power secondary core 87 and is linked to the power primary coil 40. . As a result, an induced electromotive force is generated in the power primary coil 40 due to the mutual induction action, and the high frequency voltage supplied to the power secondary coil 86 is extracted from the power primary coil 40. In this way, the power supplied from the power supply circuit 72 is transmitted from the power secondary coil 86 to the power primary coil 40 in a non-contact state. The high-frequency voltage extracted from the power primary coil 40 is converted into a DC voltage by the rectifying and stabilizing circuit 24 and then supplied to the drive circuit 22 and the liquid crystal side communication circuit 26.

  Next, a transmission path of control signals transmitted and received between the controller 14 and the liquid crystal display 12 will be described with reference to FIG. First, the control side communication circuit 106 is connected to the control circuit 74 of the controller 14. The control signal generated by the control circuit 74 is supplied to the signal secondary coil 84 after being superimposed on the high frequency voltage by the control communication circuit 106. The high-frequency voltage on which the control signal is superimposed is generated by the control-side communication circuit 106, 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 a high frequency voltage is supplied to the signal secondary coil 84, a magnetic flux that passes through the signal secondary coil 84 and changes according to the output frequency is generated. The magnetic flux passing through the signal secondary coil 84 passes through the signal primary core 39 provided in the liquid crystal display 12 from the signal secondary core 85 and is linked to the signal primary coil 38. . As a result, an induced electromotive force is generated in the signal primary side coil 38 due to the mutual induction action, and the high frequency voltage supplied to the signal secondary side coil 84 is taken out from the signal primary side coil 38. In this way, the control signal transmitted from the control circuit 74 is transmitted from the signal secondary coil 84 to the signal primary coil 38 in a non-contact state. The control signal superimposed on the high-frequency voltage extracted from the signal primary coil 38 is extracted by the liquid crystal communication circuit 26 and then transmitted to the drive circuit 22. Thereby, the drive circuit 22 displays the target image on the liquid crystal panel 20 by controlling the operations of the scan driver circuit 30 and the data driver circuit 32 based on the received control signal. In the present embodiment, since cholesteric liquid crystal is used as the liquid crystal panel 20, even if the transmitter 66 is separated from the liquid crystal display 12 and the supply of power to the liquid crystal display 12 is stopped, the display is performed. The content is maintained.

  In the present embodiment, for example, when a control signal notifying that the rewriting of the liquid crystal panel 20 has been completed is transmitted from the liquid crystal display device 12 to the controller 14, the liquid crystal display 12 to the controller 14. It is also possible to transmit a control signal. When the control information is transmitted from the liquid crystal display 12 to the controller 14, the control signal generated by the drive circuit 22 is the liquid crystal, contrary to the case where the control information is transmitted from the controller 14 to the liquid crystal display 12. Is transmitted to the signal secondary coil 84 from the signal primary coil 38 via the signal primary core 39 and the signal secondary core 85 in a non-contact state by being superimposed on the high-frequency voltage in the side communication circuit 26. After that, the control side communication circuit 106 extracts the high frequency voltage and transmits it to the control circuit 74.

  In the cholesteric liquid crystal display device 10 having such a structure, the use of cholesteric liquid crystal as the liquid crystal panel 20 makes it unnecessary to always supply power in order to maintain the display contents. Thereby, power saving of the liquid crystal display 12 can be achieved.

  When the control signal is transmitted / received from the controller 14 to the liquid crystal display 12, driving power is supplied from the controller 14 to the liquid crystal display 12. Thereby, it is not necessary to incorporate a power supply device in the liquid crystal display 12, and the liquid crystal display 12 can be configured more compactly. That is, in the cholesteric liquid crystal display device 10 according to the present embodiment, the driving power required for rewriting at the time of transmission / reception of a control signal at the time of rewriting by skillfully utilizing the characteristics of cholesteric liquid crystal that requires power only at the time of rewriting. Thus, the liquid crystal display 12 can be made compact by eliminating the need to incorporate a power supply device in the liquid crystal display 12.

  Further, in the present embodiment, when the display content of the liquid crystal panel 20 is rewritten, the secondary transmission terminal 82 of the controller 14 is not in contact with the primary transmission terminal 28 of the liquid crystal display 12 in a non-contact state. By letting it go, it is possible to supply power to the liquid crystal display 12 and to transmit and receive control signals. This eliminates the need for a physical connection such as a connector, and can reduce the risk of damaging the connection between the liquid crystal display 12 and the controller 14 even by repeated rewriting. At the same time, since the liquid crystal display 12 and the controller 14 can be electrically connected only by positioning the primary side transmission terminal 28 and the secondary side transmission terminal 82 to face each other, the degree of freedom of connection is also increased. Can be easily connected. In particular, in this embodiment, since the signal primary and secondary cores 39 and 85 and the power primary and secondary cores 41 and 87 are both pot-type cores, these transmission and reception surfaces are Since it has a rotationally symmetric shape, positioning of both transmission terminals 28 and 82 in the circumferential direction is unnecessary, and connection can be made more easily. Furthermore, since the primary side transmission terminal 28 has a convex cross section as a whole and the secondary side transmission terminal 82 has a concave cross section as a whole, the shafts can be fitted to each other so as to be unevenly fitted. It is also possible to easily perform alignment in the straight direction.

  In addition, particularly in the present embodiment, the opposed surfaces of the signal primary core 39 and the signal secondary core 85 and the opposed surfaces of the power primary core 41 and the power secondary core 87 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.

  The cholesteric liquid crystal display device 10 having such a structure has various kinds of display contents such as a supermarket price tag, a name tag indicating the name of a patient in a hospital room, a timetable and a poster in a station, and the like, whose display contents are not so frequently updated. It can use suitably for a use. Several specific examples of use of the cholesteric liquid crystal display device 10 having the structure according to the present invention are shown below, but the application of the cholesteric liquid crystal display device having the structure according to the present invention is limited to the following use examples. It should be understood that this is not an indication.

  For example, the liquid crystal display 12 having a structure according to the present invention can be used as a price tag for a supermarket display shelf as shown in FIG. In this application, the liquid crystal display 12 is attached to the fence 112 of the display shelf 110, and the price of the product is displayed on the liquid crystal panel 20 of the liquid crystal display 12. Therefore, in the liquid crystal display 12 having a structure according to the present invention, it is not necessary to incorporate a battery or the like, so that it can be disposed in a sanitary manner especially in the vicinity of foodstuffs. Then, when exchanging the products to be displayed or changing the price of the products, for example, a supermarket clerk carries the controller 14 and inputs the changed product name and price to the controller 14, as described above. By superimposing the secondary transmission terminal 82 of the transmitter 66 on the primary transmission terminal 28 of the liquid crystal display 12, the display content of the liquid crystal display 12 can be changed.

  Moreover, as shown in FIG. 13, the liquid crystal display 12 can also be used as a name tag which shows the patient name of a hospital room. In this application, the liquid crystal display 12 is attached to the wall 114 of the hospital, and the name of the inpatient in the hospital room is displayed on the liquid crystal panel 20 of the liquid crystal display 12. And when an inpatient is replaced, the patient name currently displayed on the liquid crystal display 12 can be changed using the controller 14 like the above.

  Furthermore, as shown in FIG. 14, the liquid crystal display 12 can also be used as a poster. Here, if the display content is an image that is difficult to input with a button, for example, an image to be displayed is separately created using a computer or the like, and the image data is transferred from the computer to the controller 14 using a cable connection or the like. Remember in advance. Then, by transmitting the image data stored in the controller 14 to the liquid crystal display 12, an image such as a photograph or a picture can be easily displayed on the liquid crystal display 12.

  For example, when the liquid crystal display 12 is used for a large poster or the like, the primary transmission terminal 28 can be exposed on the same side as the liquid crystal panel 20 as shown in FIG. In this way, since the transmitter 66 can be overlapped from the front side of the liquid crystal display 12, the back surface of the liquid crystal display 12 can be fixed to the wall surface.

  Furthermore, the cholesteric liquid crystal display device 10 having a structure according to the present invention can be suitably used in the manufacturing process of the liquid crystal display 12 as shown in FIG. That is, in the manufacturing process of the liquid crystal display 12, there are many opportunities to connect the liquid crystal display 12 and the controller 14 for driving the liquid crystal display 12 in order to check the operation, but the cholesteric liquid crystal display having the structure according to the present invention. According to the device 10, since the liquid crystal display device 12 and the controller 14 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. It is.

  Here, as shown in FIG. 15, if the primary transmission terminal 28 of the liquid crystal display 12 is exposed on the surface of the liquid crystal display 12, each liquid crystal display 12 flowing on the production line is sequentially arranged. By superimposing the transmitter 66, the liquid crystal display device 12 can be inspected more easily.

  As mentioned above, although one embodiment of the present invention and some applications have been described in detail, these are merely examples, and the present invention is interpreted in a limited manner by specific descriptions in the embodiments and applications. Is not to be done. In addition, in each structure described below, about the member substantially the same as the above-mentioned embodiment, the detailed description is abbreviate | omitted by attaching | subjecting the same code | symbol as the above-mentioned embodiment.

  For example, in the embodiment, the signal primary side core 39 and the power primary side core 41 in the primary side transmission terminal 28, and the signal secondary side core 85 and the power secondary side in the secondary side transmission terminal 82. The side cores 87 are arranged on concentric axes, and their end faces 43, 46, 89, 91 are positioned on different planes. For example, the side core 87 is used for primary side transmission shown in FIGS. Like the terminal 130 and the secondary transmission terminal 132 shown in FIG. 19, the central axes of the cores 39, 41 and 85, 87 are made different, and the end faces 43, 46 and 89, 91 are on the same plane. It may be positioned.

  Since the primary-side transmission terminal 130 and the secondary-side transmission terminal 132 in this aspect have substantially the same structure, the primary-side transmission terminal 130 will be described as an example. The first opening 136 and the second opening 138 open to one end surface 135 are formed. The signal primary side core 39 and the power primary side core 41 having the same structure as that of the above-described embodiment are inserted into the first opening 136 and the second opening 138 via the gap members 58 and 60. It is assembled in the stowed state. In this accommodated state, the end surface 43 of the signal primary core 39 and the end surface 46 of the power primary core 41 that are used as transmission and reception surfaces are positioned on the same plane as the end surface 135 of the accommodation case 134. In addition, the secondary transmission terminal 132 is connected to the housing case 134 having substantially the same structure as the primary transmission terminal 130, and the signal secondary core 85 and the power secondary core 87 are connected to the primary transmission. The terminal 130 is disposed opposite to the left and right (left and right directions in FIGS. 16 and 19), and the end surface 89 of the signal secondary core 85 and the end surface 91 of the power secondary core 87 are transmitted on the primary side. The end face 43 of the signal primary side core 39 and the end face 46 of the power primary side core 41 of the power terminal 130 are overlapped with each other.

  As shown in FIG. 20, the primary side transmission terminal 130 and the secondary side transmission terminal 132 having such a structure are overlapped with each other in a non-contact state so as to be separated from each other. The end face 43 and the end face 89 of the signal secondary core 85 and the end face 46 of the power primary core 41 and the end face 91 of the power secondary core 87 are opposed to each other in a non-contact state. In this way, the axial dimension (the lateral dimension in FIG. 20) 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. 130 and 132 can be easily overlapped.

  Further, as shown in FIG. 21 by way of example of the signal primary core 39 and the signal primary coil 38, the core member and the coil member may be removable from the substrate 18. In this embodiment, a bottomed cylindrical mounting bracket 140 that is open on one side is provided on the substrate 18. The signal primary side core 39 is detachably fitted into the opening of the mounting bracket 140, and the signal primary side coil 38 is detachably inserted into the signal primary side core 39. Connectors 142, 142 are provided at the respective ends of the lead wires constituting the signal primary coil 38, and are fitted to the connectors 144, 144 provided on the substrate 18, whereby It is electrically connected to the provided electronic component. 21 has a bottomed shape, the bottom portion is not always necessary. For example, a cylindrical shape that opens on both sides in the axial direction may be adopted as the mounting bracket 140.

  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, a mode in which the mounting bracket 140 is used as an electromagnetic shielding member by forming the mounting bracket 140 from a nonmagnetic material such as aluminum is preferably employed, but 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 18. Further, as apparent from this aspect, the gap member 58 in the above-described embodiment is not necessarily required, but it is of course possible to interpose the gap member 58 between the signal primary core 39 and the mounting bracket 140, for example. It is.

  Further, in the embodiment, for example, the signal primary core 39 and the power primary core 41 in the primary transmission terminal 28 are accommodated in the common primary accommodation case 42 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. 22 and FIG. 23 as an example of the signal primary core 39, an insertion hole 150 penetrating in the thickness direction of the substrate 18 is formed, and the signal primary core 39 is formed in the insertion hole 150. It is also possible to pass through and fix to the substrate 18. In this aspect, the signal primary side coil 38 is formed on the surface of the substrate 18 opposite to the liquid crystal panel 20 by printed wiring. The signal primary side core 39 is inserted into the insertion hole 150 from the same side of the substrate 18 as the liquid crystal panel 20 and protrudes to the opposite side of the liquid crystal panel 20, whereby the lead groove of the signal primary side core 39 is formed. The primary coil 38 for signals is accommodated in 44. A notch 152 is formed in a part of the outer peripheral wall portion of the lead groove 44 of the signal primary core 39 in this embodiment, and the printed wiring of the signal primary coil 38 is connected to the signal primary coil through the notch 152. It extends outside the side core 39.

  In FIG. 22, the end face 43 of the signal primary core 39 is positioned on the opposite side of the liquid crystal panel 20. For example, the signal primary core 39 is disposed on the substrate 18 from the side opposite to the liquid crystal panel 20. It is also possible to insert and arrange the end face 43 toward the liquid crystal panel 20 side. In this way, the appearance of the liquid crystal display 12 can be improved, for example, by disposing the signal primary side core 39 behind the liquid crystal panel 20 so that it cannot be seen. At the same time, the secondary transmission terminal 82 provided in the controller 14 can be superimposed from the front of the liquid crystal panel 20 and superimposed on the primary transmission terminal 28 in the back. Thus, the primary side transmission terminal 28 and the secondary side transmission terminal 82 can be placed opposite to each other, so that power and signals can be easily transmitted.

  In addition, the specific structure of the transmitter 66 including the secondary transmission terminal 82 is not limited to the above-described mode, and for example, a transmitter 160 as shown in FIG. 24 can be adopted. . The transmitter 160 is provided with a secondary transmission terminal 82 at one end portion of a clip 164 that can be opened and closed around a hinge 162. Note that the secondary transmission terminal 82 is connected to the controller 14 by a connection cable 76 as in the above-described embodiment. Then, by sandwiching the liquid crystal display 12 with the clip 164, the primary transmission terminal 28 and the secondary transmission terminal 82 provided on the liquid crystal display 12 can be overlapped. In this way, the overlapping state of the primary side transmission terminal 28 and the secondary side transmission terminal 82 can be stably maintained, and the transmission of power and signals can be performed more stably.

  Furthermore, in the above-described embodiment, the coil head constituting the control-type opposed interface and the coil head constituting the feeding-type opposed interface are respectively provided in the primary-side transmission terminal 28 and the secondary-side transmission terminal 82. Although provided separately, for example, as shown in FIG. 25, one coil head can be used in common as a control facing interface and a power feeding facing interface. The liquid crystal display 12 and the controller 14 in this embodiment are provided with a single core member (not shown) and a coil head constituted by coils 170 and 172, respectively.

  Note that the coil head composed of a single core member and a coil includes, for example, the signal cores 39 and 85 and the signal coil 38 from the primary side and secondary side transmission terminals 28 and 82 in the above embodiment, respectively. It can be easily configured by removing any one of the 84 sets and the power cores 41 and 87 and the power coils 40 and 86. The liquid crystal side communication circuit 26 and the rectification stabilization circuit 24 are connected to the coil 170 provided in the liquid crystal display 12, while the control side communication circuit 106 and the inverter are connected to the coil 172 provided in the controller 14. 104 is connected.

  In this way, one coil 170, 172 can be used in common between the liquid crystal side communication circuit 26 and the control side communication circuit 106, and between the inverter 104 and the rectification stabilization circuit 24. In addition, the coil head can be made compact. Further, since only one set of coil heads is required to face each other, both coil heads can be positioned more easily and reliably, and signal and power transmission accuracy can be improved.

  In the above-described embodiment, the lead grooves 44, 48, 90, and 92 of the cores 39, 41, 85, and 87 are all open to the outside. The lead grooves 44, 48, 90, 92 may be covered with a ferromagnetic material similar to 87.

  Furthermore, in the above-described embodiment, the signal primary core 39 and the signal secondary core 85, and the power primary core 41 and the power secondary core 87, which are opposed to each other, are substantially equal to each other. Although the inner diameter dimension and the outer diameter dimension were included, these dimensions do not necessarily have to be equal to each other, and may be different to the extent that transmission is not hindered.

  In addition, the first coil member and the second coil member, which are formed independently of each other, are assembled to a common core member so that their magnetic paths do not interfere with each other. You may comprise a core member using a common core member. Even if it does in this way, position alignment of both coil heads can be performed easily. That is, the present invention includes a structure in which the first coil head and the second coil head are integrated. Specifically, as disclosed in, for example, Japanese Patent Application Laid-Open No. 7-66057, a single coil member is wound around a single core member, whereby a single core member is wound. The first and second core members may be configured by the core member, and both the magnetic path for signal transmission and reception and the magnetic path for power transmission and reception may be configured in the core member.

  Further, the controller 14 in the above embodiment is merely an example. For example, a computer is used as the input device 64, and a keyboard and monitor of a computer are used as the input unit 68 and the display unit 70 provided in the input device 64. May be.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows the cholesteric liquid crystal display device as one Embodiment of this invention. Explanatory drawing which shows the front of a liquid crystal module roughly. 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 liquid crystal display device. Explanatory drawing equivalent to the VV cross section in FIG. Explanatory drawing which shows the back surface of a liquid crystal display device roughly. 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 IX-IX cross section in FIG. FIG. 9 is an explanatory cross-sectional view schematically showing a state in which the coil heads shown in FIGS. 4 and 8 are overlapped. 1 is a block diagram schematically showing a cholesteric liquid crystal display device. Explanatory drawing for demonstrating the usage example of a liquid crystal display device. Explanatory drawing for demonstrating the usage example from which a liquid crystal display device differs. Explanatory drawing for demonstrating the further different usage example of a liquid crystal display device. Explanatory drawing for demonstrating the further different usage example of a liquid crystal display device. The front view which shows schematically the different aspect of the coil head provided in a liquid crystal display device. Explanatory drawing equivalent to the XVII-XVII cross section in FIG. Explanatory drawing equivalent to the XVIII-XVIII 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. 20 is an explanatory cross-sectional view schematically showing a state in which the coil heads shown in FIGS. 16 and 19 are overlaid. 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 XXII-XXII cross section in 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 a display control apparatus. The block diagram which shows schematically the different aspect of a cholesteric liquid crystal display device.

Explanation of symbols

10: cholesteric liquid crystal display device, 12: liquid crystal display, 14: controller, 20: liquid crystal panel, 22: drive circuit, 38: primary coil for signal, 39: primary core for signal, 40: primary coil for power , 41: power primary side core, 72: power supply circuit, 74: control circuit, 84: signal secondary side coil, 85: signal secondary side core, 86: power secondary side coil, 87: power use Secondary core

Claims (9)

  A liquid crystal display device including a cholesteric liquid crystal element and a drive circuit for the cholesteric liquid crystal element, a control circuit for transmitting / receiving a display control signal between the drive circuit of the liquid crystal display device, and a power supply circuit for supplying power And a display control device configured to include a first core member and a first core member to form a magnetic path around the first coil member. Using a pair of the first coil heads, signals are transmitted and received using electromagnetic induction by positioning the transmitting and receiving surfaces formed by the first core members, which are formed by the open surfaces of the magnetic paths, facing each other. A control-facing interface for performing control, and mounting one of the pair of first coil heads in the control-facing interface to the liquid crystal display device Both of the other are mounted on the display control device, while using a pair of second coil heads in which a second core member is combined with a second coil member and a magnetic path is formed around the second coil member, A power supply facing interface is configured to transmit and receive power using electromagnetic induction by positioning the transmitting and receiving surfaces formed by the open surfaces of the magnetic paths formed by the respective second core members to face each other, A cholesteric liquid crystal display device in which one of the pair of second coil heads in the opposed interface for power supply is mounted on the liquid crystal display device and the other is mounted on the display control device.   In at least one of the control facing interface and the power feeding facing interface, the liquid crystal display device or the display control in which the coil head is mounted on at least one of the core member and the coil member constituting the coil head. The cholesteric liquid crystal display device according to claim 1, which is detachable from the device.   The cholesteric liquid crystal display device according to claim 1, wherein an electromagnetic shielding member is disposed on an outer periphery excluding the transmission / reception surface of at least one of the first core member and the second core member.   The low-permeability member is arrange | positioned in the outer periphery except the said transmission / reception surface in at least one core member of said 1st core member and said 2nd core member. Cholesteric liquid crystal display device.   The cholesteric liquid crystal according to any one of claims 1 to 4, wherein the first coil head and the second coil head in each of the liquid crystal display device and the display control device are arranged on a concentric axis. Display device.   The cholesteric liquid crystal display device according to claim 1, wherein the transmission / reception surface of the first core member and the transmission / reception surface of the second core member are positioned on the same plane.   The cholesteric liquid crystal display device according to claim 1, wherein the transmission / reception surface of the first core member and the transmission / reception surface of the second core member are positioned on different planes.   The cholesteric liquid crystal display device according to any one of claims 1 to 4, wherein the first coil head and the second coil head are configured by a common core member and coil member.   The cholesteric liquid crystal display device according to any one of claims 1 to 8, wherein at least one of the first core member and the second core member is a pot-type core.

Images