Transmission device and display system

Abstract

To provide a transmission device and a display system, capable of implementing bidirectional transmission of signals via a rotatable interface while implementing simplification of design and device cost reduction.SOLUTION: A transmission device comprises: a first interface device including a first antenna group provided around a first center point, the first antenna group being rotatable using the first center point as its rotation center and including a first antenna and a second antenna; and a second interface device including a second antenna group provided around a second center point, the second antenna group being rotatable using the second center point as its rotation center and including a third antenna and a fourth antenna. The first antenna faces the third antenna so that a first signal is transmitted from the first antenna to the third antenna; the second antenna faces the fourth antenna so that a second signal is transmitted from the fourth antenna to the second antenna.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a transmission device and a display system. [Background technology]

[0002] Patent Document 1 describes a display device having a connector unit having a plurality of receiving electrodes configured to receive input signals from a plurality of transmitting electrodes of a flat-plate-like interface unit, and a signal processing unit that determines an arrangement of input data included in the input signals. In the display device described in Patent Document 1, the plurality of receiving electrodes are arranged to face the plurality of transmitting electrodes in each of a plurality of connection directions defined by the in-plane rotation angle of the interface unit in a predetermined region where the interface unit is arranged to face each other.

[0003] Patent Document 2 describes a directional coupling type communication device in which a first module having a first coupler and a second module having a second coupler are stacked so that the first coupler and the second coupler overlap projectively when viewed from the stacking direction, generating signal coupling between them. Patent Document 2 describes that the first coupler and the second coupler are arc-shaped couplers having the same radius of curvature, the center of the second coupler coincides with the center of the first coupler, and the second module is provided rotatably relative to the first module. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-102063 A [Patent Document 2] JP 2014-033432 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the device described in Patent Document 1, when transmitting a signal that requires bidirectional communication, it is necessary to provide an electrode that functions as an antenna and a circuit such as an IC that processes the signal for each rotatable connection direction. Therefore, in the device described in Patent Document 1, when transmitting a signal that requires bidirectional communication, it is difficult to avoid the complication of the design and the increase in device costs. In addition, the device described in Patent Document 2 does not support bidirectional signal communication, even if the connection direction is rotatable by providing the second module rotatably relative to the first module.

[0006] In view of the above-mentioned problems, an object of the present invention is to provide a transmission device and a display system that can realize bidirectional transmission of signals via a rotatable interface while simplifying the design and reducing device costs. [Means for solving the problem]

[0007] According to one aspect of the present invention, there is provided a first interface device having a first antenna group arranged around a first center point, the first antenna group being rotatable around the first center point, the first antenna, and a second antenna at a different distance from the first center point; and a second interface device having a second antenna group arranged around a second center point, the second antenna group being rotatable around the second center point, the third antenna, and a fourth antenna at a different distance from the third antenna to the second center point. and a first interface device, the first interface device being rotatable relative to the second interface device around the first center point which coincides with the second center point in a planar view, and when the first center point and the second center point coincide with each other in a planar view, the first antenna faces the third antenna so that a first signal is transmitted from the first antenna to the third antenna, and the second antenna faces the fourth antenna so that a second signal is transmitted from the fourth antenna to the second antenna.

[0008] According to another aspect of the present invention, there is provided a display device comprising: a display panel; a drive device that transmits a video signal of a video to be displayed on the display panel to the display panel, transmits a first control signal to the display panel, and receives a second control signal from the display panel; and a transmission device that connects the display panel and the drive device, the transmission device having a first antenna group provided around a first center point, the first antenna group being rotatable around the first center point as a center of rotation, a first interface device including a first antenna and a second antenna at a different distance from the first center point; and a second antenna group provided around a second center point, the second antenna group being rotatable around the second center point as a center of rotation. a second interface device including a third antenna and a fourth antenna at a different distance from the third antenna and the second center point, the first interface device being rotatable relative to the second interface device around the first center point which coincides with the second center point in a planar view, and when the first center point and the second center point coincide with each other in a planar view, the first antenna faces the third antenna so that a first control signal is transmitted from the first antenna to the third antenna, and the second antenna faces the fourth antenna so that a second control signal is transmitted from the fourth antenna to the second antenna. Effect of the Invention

[0009] According to the present invention, bidirectional signal transmission can be achieved through a rotatable interface while simplifying the design and reducing the device cost. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a block diagram showing the overall configuration of a display system according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view showing a transmitting board and a receiving board in the display system according to the first embodiment of the present invention. [Diagram 3] FIG. 3 is a plan view showing the shape of an antenna for a control signal in the display system according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a plan view showing a modified example of the shape of the antenna for the control signal in the display system according to the first embodiment of the present invention. [Diagram 5] FIG. 5 is a plan view showing a state in which the transmission board is disposed at a rotation angle of 0° with respect to the reception board in the display system according to the first embodiment of the present invention. [Figure 6] FIG. 6 is a plan view showing a state in which the transmission board is arranged at a rotation angle of 90° with respect to the reception board in the display system according to the first embodiment of the present invention. [Figure 7] FIG. 7 is a plan view showing a state in which the transmission board is arranged at a rotation angle of 180° with respect to the reception board in the display system according to the first embodiment of the present invention. [Figure 8] FIG. 8 is a plan view showing a state in which the transmission board is arranged at a rotation angle of 270° with respect to the reception board in the display system according to the first embodiment of the present invention. [Figure 9] FIG. 9 is a plan view showing the antenna arrangement of the transmitting board and the receiving board in a display system according to the second embodiment of the present invention. [Figure 10] FIG. 10 is a diagram showing a state in which the transmission board is disposed at a rotation angle of 0° with respect to the reception board in the display system according to the second embodiment of the present invention. [Figure 11] FIG. 11 is a diagram showing a state in which the transmission board is arranged at a rotation angle of 45° with respect to the reception board in the display system according to the second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] [First embodiment] A display system according to a first embodiment of the present invention will be described with reference to FIGS.

[0012] First, the overall configuration of the display system according to this embodiment will be described with reference to Fig. 1. Fig. 1 is a block diagram showing the overall configuration of the display system according to this embodiment.

[0013] 1, a display system 1 according to this embodiment includes an image generating device 2, a transmission device 3, and a display panel 4. The display system 1 is a system in which an image generated by the image generating device 2 is transmitted to the display panel 4 by the transmission device 3 and displayed on the display panel 4.

[0014] The image generating device 2 is a driving device that generates and outputs a video signal of an image to be displayed on the display panel 4 according to a video source, and drives the display panel 4 by the video signal. The image generating device 2 is not particularly limited, and may be, for example, a set-top box or a computer. The image generating device 2 transmits the generated video signal to the display panel 4 in multiple lanes via the transmission device 3. The image generating device 2 can transmit, for example, a four-lane video signal for the display panel 4 having a resolution of FHD (Full High Definition) by the V-by-One (registered trademark) HS method. A case where the image generating device 2 transmits a four-lane video signal will be described below.

[0015] Furthermore, the image generating device 2 transmits and receives control signals to and from the display panel 4 via the transmission device 3. The control signals transmitted and received between the image generating device 2 and the display panel 4 may include a plurality of types of control signals. Specifically, the control signals are, for example, a V-by-One (registered trademark) signal, a Hot Plug Detect signal, a Lock Detect signal, an I2C (Inter-Integrated Circuit, inter-panel communication) signal, an abnormality detection signal of the display panel 4, and a signal related to image quality correction of the display panel 4.

[0016] The video generating device 2 has an input / output terminal 22 through which a video signal is output and through which a control signal is input / output. The input / output terminal 22 is connected to one input / output terminal 102 of the signal array conversion board 10 of the transmission device 3 via a cable 802 that transmits the video signal and the control signal.

[0017] The transmission device 3 is a cable device that connects the video generating device 2 and the display panel 4 and transmits signals transmitted and received between the video generating device 2 and the display panel 4. Specifically, the transmission device 3 transmits a video signal input from the video generating device 2 to the display panel 4. The transmission device 3 also transmits a control signal transmitted and received between the video generating device 2 and the display panel 4.

[0018] The transmission device 3 has a signal array conversion board 10 and a transmission board 20. The signal array conversion board 10 and the transmission board 20 do not necessarily have to be separate boards, and may be an integrated board. In addition, the reception board 30 described later may also constitute a part of the transmission device 3.

[0019] The signal array conversion board 10 is connected to the input / output end 22 of the video generating device 2 via a cable 802, and has one input / output end 102 to which a video signal is input and a control signal is input / output. The signal array conversion board 10 has a selector 104. A four-lane video signal is input from the video generating device 2 to the selector 104. Sensor signals are also input to the selector 104 from magnetic sensors 226-1 and 226-2 described below. The selector 104 is an IC (Integrated Circuit) that converts the array of the four-lane video signals based on the sensor signals and outputs the converted signals. The signal array conversion board 10 also transmits control signals transmitted and received between the video generating device 2 and the display panel 4.

[0020] The signal array conversion board 10 has the other input / output end 106 where the video signal is output, the sensor signal is input, and the control signal is input / output. The other input / output end 106 of the signal array conversion board 10 is connected to the input / output end 204 of the transmission board 20 via a cable 804 that transmits the video signal, the control signal, and the sensor signal.

[0021] The transmission board 20 is connected to the signal array conversion board 10 via a cable 804, and has an input / output terminal 204 to which a video signal is input, a sensor signal is output, and a control signal is input / output. The transmission board 20 has four antennas 210-i (where i is an integer satisfying 1≦i≦4) which are an antenna group for transmitting a video signal, and two antennas 222T, 222R which are an antenna group for transmitting and receiving a control signal. The transmission board 20 has magnetic sensors 226-1, 226-2 for detecting a rotation angle of a receiving board 30 described later with respect to the transmission board 20. The transmission board 20 is provided at one end of the transmission device 3 so as to be connected to the receiving board 30. The transmission board 20 is an interface device that configures a non-contact interface together with the receiving board 30 for transmitting a video signal and a control signal. For example, power can be supplied to the transmission board 20 from the signal array conversion board 10. The transmission board 20 will be described in detail later.

[0022] The display panel 4, which is a display device, is, for example, an OLED (Organic Light Emitting Diode) display, a liquid crystal display, a plasma display, etc. The display panel 4 has a receiving board 30, a Tcon board 40, a panel unit 50, a source driver 60, and a gate driver 70.

[0023] The panel unit 50 has a plurality of pixels arranged in a matrix, and functions as a display unit that displays an image. Each pixel may include a plurality of sub-pixels of each color, such as red (R), green (G), and blue (B). The panel unit 50 has, for example, a rectangular shape. The display panel 4 may be installed in a landscape arrangement in which the longitudinal direction of the rectangular panel unit 50 that displays an image is horizontal, or in a portrait arrangement in which the longitudinal direction is vertical. The display panel 4 may also be installed so that the longitudinal direction of the panel unit 50 forms any angle with respect to the vertical or horizontal direction.

[0024] The receiving board 30 has four antennas 310-j (where j is an integer satisfying 1≦j≦4) which are an antenna group for receiving video signals, and two antennas 322R, 322T which are an antenna group for transmitting and receiving control signals. The receiving board 30 has magnets 326-1, 326-2 for detecting the rotation angle of the receiving board 30 relative to the transmitting board 20. The receiving board 30 is provided on the back surface of the display panel 4 so that the transmitting board 20 can be connected. The receiving board 30 is an interface device which, together with the transmitting board 20, constitutes a non-contact interface for transmitting video signals and control signals. For example, the receiving board 30 can be supplied with power directly, or can be supplied with power via a terminal such as a pogo pin from the transmitting board 20 which receives power from the signal array conversion board 10. Details of the receiving board 30 will be described later.

[0025] The receiving board 30 has an input / output terminal 304 through which a video signal is output and through which a control signal is input / output. The input / output terminal 304 of the receiving board 30 is connected to the input / output terminal 402 of the Tcon board 40 via a cable 806 that transmits a video signal and a control signal.

[0026] The Tcon board 40 includes a timing controller 404. The timing controller 404 is connected to the source driver 60 and the gate driver 70 so as to be able to communicate with each other.

[0027] The timing controller 404 controls the operations of the source driver 60 and the gate driver 70 based on a control signal input from the video generating device 2 via the transmission device 3. The timing controller 404 also generates luminance data indicating the luminance of each sub-pixel constituting a pixel in the panel unit 50 based on a video signal input from the video generating device 2 via the transmission device 3, and outputs the luminance data as an output signal to the source driver 60. The video signal includes timing signals such as a vertical synchronization signal, a horizontal synchronization signal, and a data enable signal.

[0028] The source driver 60 supplies voltages for driving a plurality of pixels in the panel unit 50 via a plurality of data lines DL in response to control of the timing controller 404. The gate driver 70 supplies scan signals to a plurality of pixels in the panel unit 50 via a plurality of gate lines GL in response to control of the timing controller 404. In this manner, the timing controller 404 functions as a display control device that controls the operation of the panel unit 50 that displays images.

[0029] Next, the details of the transmission board 20 and the reception board 30, which are interface devices constituting a non-contact interface in the display system 1, will be further described with reference to Figs. 2 to 8. Fig. 2(a) is a plan view showing the transmission board 20. Fig. 2(b) is a plan view showing the reception board 30. Fig. 3 is a plan view showing the shapes of the antennas 222T, 222R (322R, 322T) for control signals. Fig. 4 is a plan view showing modified shapes of the antennas 222T, 222R (322R, 322T) for control signals. Figs. 5 to 8 are plan views showing the state in which the transmission board 20 is disposed at rotation angles of 0°, 90°, 180°, and 270° relative to the reception board 30, respectively.

[0030] The transmitting board 20 and the receiving board 30 are interface devices that constitute a non-contact interface for transmitting video signals and control signals, and function as part of a transmission device that transmits video signals and control signals. The transmitting board 20 transmits video signals to the receiving board 30. The receiving board 30 receives video signals from the transmitting board 20. The transmitting board 20 and the receiving board 30 also transmit and receive control signals.

[0031] As shown in Fig. 2(a), the transmitting board 20 has a board body 202, an input / output terminal 204, four video signal line pairs 206-i, four transmitter circuits 208-i, and four video signal antennas 210-i. The transmitting board 20 also has a control signal line group 212, a SerDes circuit 214, two control signal line pairs 216T, 216R, a transmitter circuit 218, a receiver circuit 220, and two control signal antennas 222T, 222R. The transmitting board 20 also has two sensor signal lines 224-1, 224-2, and two magnetic sensors 226-1, 226-2. The transmitting board 20 also has a plurality of magnets 228 for alignment and fixing.

[0032] The board body 202 is a substrate on which various circuits are provided. An input / output end 204 is provided at one end of the board body 202. The input / output end 204 is configured as a connector section that can be connected to a cable. A cable 804 that transmits a video signal, a control signal, and a sensor signal is connected to the input / output end 204.

[0033] The board body 202 is also provided with four video signal line pairs 206-i, four transmitter circuits 208-i, and four antennas 210-i for video signals.

[0034] The video signal line pair 206-i is provided on one surface of the board body 202 (the surface on the front side of the paper in FIG. 2(a)). One end of the video signal line pair 206-i is connected to the input / output terminal 204. The other end of the video signal line pair 206-i is connected to the antenna 210-i. The video signal line pair 206-i is composed of two video signal lines for one lane that transmit video signals as differential signals. A video signal that has undergone array conversion by the selector 104 of the signal array conversion board 10 is input to the video signal line pair 206-i.

[0035] The antenna 210-i is for transmitting a video signal, and is a transmission element that enables contactless transmission of a video signal by electromagnetic field coupling between any of the antennas 310-j of the receiving board 30. The antenna 210-i transmits a video signal to any of the opposing antennas 310-j. The antenna 210-i is provided on the other surface (the surface on the back side of the paper in FIG. 2(a)) of the board body 202. One end of the antenna 210-i is connected to the other end of the video signal line pair 206-i through a via. The antenna 210-i is terminated by connecting a termination resistor 230-i to the other end as necessary. The other end of the antenna 210-i is connected to a termination resistor 230-i provided on one surface of the board body 202 through a via.

[0036] The board body 202 has a square area AT that is rotationally symmetric. The four antennas 210-i are arranged between the four corners of the area AT and the center point OT of the area AT so as to be rotationally symmetric with the center point OT of the area AT as the center of rotation. The area AT is not limited to a square area, and may be any area having a rotationally symmetric shape.

[0037] The transmitter circuit 208-i is provided on the video signal line pair 206-i. The transmitter circuit 208-i is an IC that transmits the video signal transmitted on the video signal line pair 206-i from the antenna 210-i to the receiving board 30. The transmitter circuit 208-i functions as an amplifier that amplifies the video signal transmitted from the antenna 210-i.

[0038] The board body 202 is also provided with a group of control signal lines 212, a SerDes circuit 214, two pairs of control signal lines 216T, 216R, a transmitter circuit 218, a receiver circuit 220, and two antennas 222T, 222R for control signals.

[0039] The group of control signal lines 212 is provided on one surface of the board body 202. The group of control signal lines 212 includes a plurality of control signal lines for bidirectional transmission of control signals by parallel transmission. One end of the group of control signal lines 212 is connected to the input / output terminal 204. The other end of the group of control signal lines 212 is connected to a SerDes circuit 214.

[0040] The control signal line pair 216T is provided on one surface and the other surface of the board body 202, with the surfaces being connected by vias. The control signal line pair 216T is composed of two control signal lines for one lane that transmit a control signal sent from the video generation device 2 to the display panel 4 as a differential signal by serial transmission. One end of the control signal line pair 216T is connected to the SerDes circuit 214. The other end of the control signal line pair 216T is connected to the antenna 222T.

[0041] The transmitter circuit 218 is provided on the control signal line pair 216T. The transmitter circuit 218 is an IC that transmits a control signal transmitted on the control signal line pair 216T from the antenna 222T to the receiving board 30. The transmitter circuit 218 functions as an amplifier that amplifies the control signal transmitted from the antenna 222T.

[0042] The control signal line pair 216R is provided on one surface of the board body 202. The control signal line pair 216R is composed of two control signal lines, one lane, that transmit a control signal sent from the display panel 4 to the video generation device 2 as a differential signal by serial transmission. One end of the control signal line pair 216R is connected to the SerDes circuit 214. The other end of the control signal line pair 216R is connected to the antenna 222R.

[0043] The receiver circuit 220 is provided on the control signal line pair 216R. The receiver circuit 220 is an IC that receives a control signal received from the receiving board 30 by the antenna 222R and transmitted by the control signal line pair 216R. The receiver circuit 220 functions as an amplifier that amplifies the control signal received by the antenna 222R.

[0044] The SerDes circuit 214 is provided on one side of the board body 202. The SerDes circuit 214 is an IC that converts between parallel transmission and serial transmission of a control signal. The SerDes circuit 214 is capable of transmitting a control signal by bidirectional SerDes with a SerDes circuit 314 (described later) of the receiving board 30. In transmitting a control signal, the SerDes circuit 214 serves as a master and the SerDes circuit 314 serves as a slave. The SerDes circuit 214 converts between a control signal transmitted by parallel transmission in the control signal line group 212 and a control signal transmitted by serial transmission in the control signal line pair 216T, 216R.

[0045] The antenna 222T is for transmitting a control signal, and is a transmission element that enables non-contact transmission of the control signal by electromagnetic field coupling with the antenna 322R of the receiving board 30. The antenna 222T transmits a control signal to the opposing antenna 322R. The antenna 222T is provided on the other surface of the board body 202. The antenna 222T is connected to the other end of the control signal line pair 216T.

[0046] The antenna 222R is for receiving a control signal, and is a transmission element that enables non-contact transmission of the control signal by electromagnetic field coupling with the antenna 322T of the receiving board 30. The antenna 222R receives a control signal from the opposing antenna 322T. The antenna 222R is provided on the other surface of the board body 202. The antenna 222R is connected to the other end of the control signal line pair 216R.

[0047] 3, the antenna 222T has a pattern shape that is a partially deformed circular ring shape that is rotationally symmetric about the center point OT of the area AT, specifically, a planar shape that is partially missing at the connection portion with the control signal line pair 216T. Both ends of the connection portion of the antenna 222T with the control signal line pair 216T are directly connected to the other ends of the two control signal lines of the control signal line pair 216T. Thus, the antenna 222T is configured to be rotatable within a plane along a rotation plane along the other surface of the board body 202, with the center point OT as the rotation center.

[0048] The antenna 222R is disposed inside the antenna 222T. Therefore, the distance of the antenna 222R from the center point OT is different from that of the antenna 222T. The pattern shape of the antenna 222R is a planar shape that is a partially deformed circular ring shape that is a rotationally symmetric shape with the center point OT of the area AT as the rotation center, specifically, a planar shape that is partially missing at the connection part with the control signal line pair 216R. Both ends of the connection part of the antenna 222R with the control signal line pair 216R are connected to the other ends of the two control signal lines of the control signal line pair 216R through vias. Since the antenna 222R is disposed inside the antenna 222T, the outer diameter is shorter than that of the antenna 222T. Thus, the antenna 222R is configured to be rotatable in a plane along a rotation plane along the other surface of the board body 202 with the center point OT as the rotation center.

[0049] The outer circumferential length L1 of the antenna 222T is longer than the outer circumferential length L2 of the antenna 222R. The radial width W1 of the antenna 222T is narrower than the radial width W2 of the antenna 222R. By setting the outer circumferential lengths L1, L2 and the radial widths W1, W2 of the antennas 222T, 222R in this way, the transmission speed of the antenna 222T transmitting the control signal is the same as the transmission speed of the antenna 222R transmitting the control signal. That is, the antennas 222T and 222R are capable of transmitting or receiving at the same transmission speed. Note that the longer the outer circumferential lengths L1, L2, the lower the transmission center frequency of the antennas 222T, 222R. Therefore, in order to design both antennas 222T, 222R to have the same transmission speed, it is sufficient to start with the outer antenna 222T and then design the inner antenna 222R based on that design.

[0050] It should be noted that the antennas 222T and 222R may be reversed, and the antenna 222T may be disposed inside the antenna 222R.

[0051] Moreover, the antennas 222T and 222R are not limited to those having a planar shape that is a partially deformed circular ring shape. The antennas 222T and 222R may have a planar shape that is a partially deformed shape that is rotationally symmetric with the center point OT of the area AT as the center of rotation, specifically, a planar shape that is partially missing at the connection portion with the control signal line pair 216T and 216R.

[0052] For example, the antenna 222T may have a planar shape in which a circular ring shape is partially missing as shown in FIG. 4(a) or a regular polygon ring shape is partially missing. Specifically, the antenna 222T may have a planar shape in which a square ring shape is partially missing as shown in FIG. 4(b). The antenna 222T may have a planar shape in which a regular pentagonal ring shape is partially missing as shown in FIG. 4(c) or a regular hexagonal ring shape is partially missing as shown in FIG. 4(d). The antenna 222R also has a planar shape different from the antenna 222T in distance from the center point OT, and may have the planar shape shown in FIG. 4(a) or the planar shape shown in FIG. 4(b) to FIG. 4(d) like the antenna 222T. The antennas 222T and 222R may have the same planar shape with different distances from the center point OT, or may have planar shapes with different distances from the center point OT and different shapes.

[0053] 2(a), magnets 228 are provided at the four corners of the area AT of the board body 202 in which the antennas 210-i, 222T, and 222R are arranged. These four magnets 228 are intended to align and fix the transmitting board 20 and the receiving board 30 to each other by the magnetic attraction force acting between the magnets 228 and the magnets 328 provided at the four corners of the receiving board 30. The magnets 228 are provided so that the magnetic pole of the magnet 328, which is opposite in polarity to the magnet 328, faces the other surface of the board body 202.

[0054] The board body 202 is also provided with sensor signal lines 224-1 and 224-2 and magnetic sensors 226-1 and 226-2.

[0055] The sensor signal lines 224-1 and 224-2 are provided on one surface of the board body 202. One end of the sensor signal lines 224-1 and 224-2 is respectively connected to the input / output terminal 204. The other ends of the sensor signal lines 224-1 and 224-2 are respectively connected to the magnetic sensors 226-1 and 226-2.

[0056] The magnetic sensors 226-1 and 226-2 are provided on the other surface of the board body 202. The magnetic sensors 226-1 and 226-2 are connected to the other ends of the sensor signal lines 224-1 and 224-2, respectively, through vias. They are provided at the center of the two adjacent side ends of the square area AT. The magnetic sensors 226-1 and 226-2 output a sensor signal that indicates the presence or absence of detection of the magnetic field of the magnets 326-1 and 326-2 for rotation angle detection provided on the receiving board 30. The magnetic sensors 226-1 and 226-2 function as a detection unit for detecting the rotation angle of the transmitting board 20 relative to the receiving board 30.

[0057] As shown in Fig. 2(b), the receiving board 30 has a board body 302, an input / output terminal 304, four pairs of video signal lines 306-j, four receiver circuits 308-j, and four antennas 310-j for video signals. The receiving board 30 also has a group of control signal lines 312, a SerDes circuit 314, two pairs of control signal lines 316R, 316T, a receiver circuit 318, a transmitter circuit 320, and two antennas 322R, 322T for control signals. The receiving board 30 also has two magnets 326-1, 326-2 for detecting a rotation angle. The receiving board 30 also has a plurality of magnets 328 for alignment and fixing.

[0058] The board body 302 is a substrate on which various circuits are provided. An input / output end 304 is provided at one end of the board body 302. The input / output end 304 is configured as a connector section that can be connected to a cable. A cable 806 that transmits a video signal and a control signal is connected to the input / output end 304.

[0059] The board body 302 is also provided with four video signal line pairs 306-j, four receiver circuits 308-j, and four video signal antennas 310-j.

[0060] The video signal line pair 306-j is provided on one surface (the surface on the front side of the paper in FIG. 2(b)) of the board body 302. One end of the video signal line pair 306-j is connected to the input / output terminal 304. The other end of the video signal line pair 306-j is connected to the antenna 310-j. The video signal line pair 306-j is composed of one lane of two video signal lines that transmit video signals as differential signals.

[0061] The antenna 310-j is for receiving a video signal, and is a transmission element that enables contactless transmission of a video signal by electromagnetic field coupling between any of the antennas 210-i of the transmission board 20. The antenna 310-j receives a video signal from any of the opposing antennas 210-i. The antenna 310-j is provided on one surface of the board body 302. One end of the antenna 310-j is connected to the other end of the video signal line pair 306-j through a via. The antenna 310-j is simply terminated by being connected to a termination resistor 330-j as necessary. The other end of the antenna 310-j is connected to a termination resistor 330-j provided on the other surface of the board body 302 (the surface on the back side of the paper in FIG. 2(b)) through a via.

[0062] The board body 302 has a square area AR that is rotationally symmetric. The area AR is a square planar shape of the same size as the area AT. The four antennas 310-j are arranged between the four corners of the area AR and the center point OR of the area AR so as to be rotationally symmetric with the center point OR of the area AR as the center of rotation. The area AR is not limited to a square area, and may be any area that is rotationally symmetric with the same size and shape as the area AT.

[0063] The receiver circuit 308-j is provided on the video signal line pair 306-j. The receiver circuit 308-j is an IC that receives a video signal received by the antenna 310-j from the transmission board 20 and transmitted by the video signal line pair 306-j. The receiver circuit 308-j functions as an amplifier that amplifies the video signal received by the antenna 310-j.

[0064] The board body 302 also includes a group of control signal lines 312, a SerDes circuit 314, two pairs of control signal lines 316R, 316T, a receiver circuit 318, a transmitter circuit 320, and two antennas 322R, 322T for control signals.

[0065] The group of control signal lines 312 is provided on one surface of the board body 302. The group of control signal lines 312 includes a plurality of control signal lines for bidirectional transmission of control signals by parallel transmission. One end of the group of control signal lines 312 is connected to the input / output terminal 304. The other end of the group of control signal lines 312 is connected to a SerDes circuit 314.

[0066] The control signal line pair 316R is provided on one surface of the board body 302. The control signal line pair 316R is composed of two control signal lines, one lane, that transmit a control signal sent from the video generation device 2 to the display panel 4 as a differential signal by serial transmission. One end of the control signal line pair 316R is connected to the SerDes circuit 314. The other end of the control signal line pair 316R is connected to the antenna 322R.

[0067] The receiver circuit 318 is provided on the control signal line pair 316R. The receiver circuit 318 is an IC that receives a control signal received from the transmission board 20 by the antenna 322R and transmitted by the control signal line pair 316R. The receiver circuit 318 functions as an amplifier that amplifies the control signal received by the antenna 322R.

[0068] The control signal line pair 316T is provided on one surface and the other surface of the board body 302, with the surfaces being connected by vias. The control signal line pair 316T is composed of two control signal lines for one lane that transmit a control signal sent from the display panel 4 to the video generation device 2 as a differential signal by serial transmission. One end of the control signal line pair 316T is connected to the SerDes circuit 314. The other end of the control signal line pair 316T is connected to the antenna 322T through a via.

[0069] The transmitter circuit 320 is provided on the control signal line pair 316T. The transmitter circuit 320 is an IC that transmits a control signal transmitted on the control signal line pair 316T from the antenna 322T to the transmission board 20. The transmitter circuit 320 functions as an amplifier that amplifies the control signal transmitted from the antenna 322T.

[0070] The SerDes circuit 314 is provided on one side of the board body 302. The SerDes circuit 314 is an IC that converts between parallel transmission and serial transmission of a control signal. The SerDes circuit 314 is capable of transmitting a control signal by bidirectional SerDes with the above-mentioned SerDes circuit 214 of the transmission board 20. The SerDes circuit 314 converts between a control signal transmitted by parallel transmission in the control signal line group 312 and a control signal transmitted by serial transmission in the control signal line pair 316R, 316T.

[0071] The antenna 322R is for receiving a control signal, and is a transmission element that enables non-contact transmission of the control signal by electromagnetic field coupling with the antenna 222T of the transmission board 20. The antenna 322R receives a control signal from the opposing antenna 222T. The antenna 322R is provided on one surface of the board body 302. The antenna 322R is connected to the other end of the control signal line pair 316R.

[0072] The antenna 322T is for transmitting a control signal, and is a transmission element that enables non-contact transmission of the control signal by electromagnetic field coupling with the antenna 222R of the transmission board 20. The antenna 322T transmits a control signal to the opposing antenna 222R. The antenna 322T is provided on one surface of the board body 302. The antenna 322T is connected to the other end of the control signal line pair 316T.

[0073] The antenna 322R has the same planar shape and size as the antenna 222T. The antenna 322T has the same planar shape and size as the antenna 222R. The antenna 322R does not necessarily have to have the same planar shape and size as the antenna 222T, but only needs to have a planar shape that partially overlaps with the antenna 222T so that a control signal can be transmitted when viewed from a direction opposite to the antenna 222T. The antenna 322T does not necessarily have to have the same planar shape and size as the antenna 222R, but only needs to have a planar shape that partially overlaps with the antenna 222R so that a control signal can be transmitted when viewed from a direction opposite to the antenna 222R.

[0074] 3, the antenna 322R has a pattern shape that is a partially deformed circular ring shape that is rotationally symmetrical about the center point OR of the area AR, specifically, a planar shape that is partially missing at the connection portion with the control signal line pair 316R. Both ends of the connection portion with the control signal line pair 316R of the antenna 322R are directly connected to the other ends of the two control signal lines of the control signal line pair 316R. Thus, the antenna 322R is configured to be rotatable within a plane along a rotation plane along one surface of the board body 302, with the center point OR as the rotation center.

[0075] The antenna 322T is disposed inside the antenna 322R. Therefore, the distance of the antenna 322T from the center point OR is different from that of the antenna 322R. The pattern shape of the antenna 322T is a planar shape that is a partially deformed circular ring shape that is a rotationally symmetric shape with the center point OR of the area AR as the center of rotation, specifically, a planar shape that is partially missing at the connection part with the control signal line pair 316T. Both ends of the connection part of the antenna 322T with the control signal line pair 316T are connected to the other ends of the two control signal lines of the control signal line pair 316T through vias. Since the antenna 322T is disposed inside the antenna 322R, the outer diameter is shorter than that of the antenna 322R. Thus, the antenna 322T is configured to be rotatable within a plane along a rotation plane along one surface of the board body 302 with the center point OR as the center of rotation.

[0076] The outer circumferential length L1 of the antenna 322R is longer than the outer circumferential length L2 of the antenna 322T. The radial width W1 of the antenna 322R is narrower than the radial width W2 of the antenna 322T. By setting the outer circumferential lengths L1, L2 and the radial widths W1, W2 of the antennas 322R, 322T in this way, the transmission speed of the antenna 322R transmitting a control signal is the same as the transmission speed of the antenna 322T transmitting a control signal. That is, the antennas 322R and 322T can transmit or receive signals at the same transmission speed. The longer the outer circumferential lengths L1, L2, the lower the transmission center frequency of the antennas 322R, 322T. Therefore, in order to design both antennas 322R, 322T to have the same transmission speed, it is sufficient to start with the outer antenna 322R and then design the inner antenna 322T based on that design.

[0077] It should be noted that antenna 322R and antenna 222T may be reversed in correspondence with antennas 222T and 222R, and antenna 322R may be disposed inside antenna 322T.

[0078] Similarly to the antennas 222T and 222R, the antennas 322R and 322T are not limited to having a planar shape that is a partially deformed circular ring shape. The antennas 322R and 322T may have a planar shape that is a partially deformed shape that is rotationally symmetric with the center point OR of the area AR as the center of rotation, specifically, a planar shape that is partially cut off at the connection portion with the pair of control signal lines 316R and 316T.

[0079] The antenna 322R may have a planar shape with a part of a circular ring shape missing as shown in FIG. 4(a) as well as a planar shape with a part of a regular polygon ring shape missing, similar to the antenna 222T. Specifically, the antenna 322R may have a planar shape with a part of a square ring shape missing as shown in FIG. 4(b). Also, the antenna 322R may have a planar shape with a part of a regular pentagon ring shape missing as shown in FIG. 4(c) as well as a planar shape with a part of a regular hexagon ring shape missing as shown in FIG. 4(d) as well as the antenna 222T. The antenna 322T may have a planar shape with a different distance from the center point OR from the antenna 322R, and may have a planar shape shown in FIG. 4(b) to FIG. 4(d) as well as the planar shape shown in FIG. 4(a) as well as the planar shape shown in FIG. The antennas 322R and 322T may have the same planar shape with different distances from the center point OR, or may have planar shapes with different distances from the center point OR and different shapes.

[0080] 2(b), magnets 328 are provided at the four corners of the area AR of the board body 302 in which the antennas 310-j, 322R, and 322R are arranged. These four magnets 328 are intended to align and fix the transmitting board 20 and the receiving board 30 to each other by the magnetic attraction force acting between the magnets 228 provided at the four corners of the transmitting board 20. The magnets 328 are provided so that a magnetic pole of the opposite polarity to that of the magnets 228 faces one surface of the board body 302.

[0081] In this manner, the transmitting board 20 and the receiving board 30 are configured to constitute a non-contact interface for transmitting video signals and control signals.

[0082] The receiving board 30 is installed on the display panel 4 so that one surface of the board body 302 faces the rear direction of the display panel 4, for example, to form a connector section. The receiving board 30 can be rotated along a rotation plane along one surface of the board body 302 to change the orientation depending on the orientation of the display panel 4, such as landscape orientation, portrait orientation, etc.

[0083] The transmitting board 20 can rotate around a center point OT, which coincides with the center point OR in a plan view, along a rotation plane along the other surface of the board body 202 with respect to the receiving board 30, whose orientation can be changed. The transmitting board 20 is positioned and fixed in an orientation rotated by a predetermined rotation angle. That is, the transmitting board 20 is positioned and fixed to the receiving board 30 in an orientation rotated by a rotation angle of 0°, 90°, 180°, or 270° with respect to the receiving board 30, in increments of 90°, with the center point OT, which coincides with the center point OR in a plan view, as the rotation center.

[0084] The transmitting board 20 is fixed to the receiving board 30 so that the other surface of the board body 202 on which the antennas 210-i, 222T, and 222R are provided faces one surface of the board body 302 on which the antennas 310-j, 322R, and 322T of the receiving board 30 are provided. At this time, the transmitting board 20 is arranged so that the magnets 228 at the four corners of the area AT of the transmitting board 20 and the magnets 328 at the four corners of the area AR of the receiving board 30 are aligned, and the transmitting board 20 is fixed to the receiving board 30 by the magnetic attraction acting between the magnets 228 and the magnets 328. At this time, the center point OT of the area AT and the center point OR of the area AR coincide in a plan view. At this time, the other surface of the board body 202 is parallel to one surface of the board body 302.

[0085] The transmitting board 20 and the receiving board 30 may be configured such that through holes are provided at center points OT and OR that coincide with each other in a plan view, and the boards are rotatably held by a central rod that serves as a rotation axis inserted into the through holes. In this case, the transmitting board 20 or the receiving board 30 may be held rotatably around the center point OT or the center point OR, or both the transmitting board 20 and the receiving board 30 may be held rotatably around the center points OT and OR, respectively. By using such a central rod to rotate the transmitting board 20 or the receiving board 30, the positioning of the transmitting board 20 and the receiving board 30 can be easily and quickly performed.

[0086] In this way, by fixing the transmitting board 20 to the receiving board 30, the antennas of both boards face each other, enabling signal transmission between the antennas. That is, any one of the antennas 210-i and any one of the antennas 310-j face each other in a 1:1 relationship so as to be able to transmit a video signal transmitted from the video generating device 2 to the display panel 4. Also, the antennas 222T and 322R face each other so as to be able to transmit a control signal transmitted from the video generating device 2 to the display panel 4. Furthermore, the antennas 222R and 322T face each other so as to be able to transmit a control signal transmitted from the display panel 4 to the video generating device 2.

[0087] Thus, in this embodiment, the transmission board 20 is fixed to the receiving board 30 in an arrangement direction rotated at a predetermined rotation angle with respect to the receiving board 30, thereby connecting the image generating device 2 and the display panel 4 via the transmission device 3. Therefore, in this embodiment, the image generating device 2 and the display panel 4 can be connected with a high degree of freedom.

[0088] 5 shows a case where the transmitting board 20 is arranged and fixed at a rotation angle of 0° with respect to the receiving board 30. The rotation angle is an angle of the transmitting board 20 rotated counterclockwise with respect to the receiving board 30 around the center point OT as the center of rotation, with the reference angle being 0° in the case shown in FIG. 5 where the input / output terminal 204 of the transmitting board 20 and the input / output terminal 304 of the receiving board 30 are located on opposite sides. In the case shown in FIG. 5, the antenna 210-1 faces the antenna 310-1, the antenna 210-2 faces the antenna 310-2, the antenna 210-3 faces the antenna 310-3, and the antenna 210-4 faces the antenna 310-4. In this case, the magnetic sensor 226-1 detects the magnetic field of the magnet 326 facing it and outputs a sensor signal indicating magnetic field detection, while the magnetic sensor 226-2 does not detect the magnetic field and outputs a sensor signal indicating magnetic field non-detection. The sensor signals are input to the selector 104 of the signal array conversion board 10 via the sensor signal lines 224-1, 224-2 and the cable 804, respectively.

[0089] The selector 104 converts the arrangement of the video signals so that the four lanes of video signals V1, V2, V3, and V4 are transmitted to the video signal line pairs 306-1, 306-2, 306-3, and 306-4 of the receiving board 30, respectively, in accordance with the rotation angle of the transmitting board 20 relative to the receiving board 30. In this way, the selector 104 functions as a conversion unit that converts the arrangement of the four lanes of video signals in accordance with the rotation angle of the transmitting board 20 relative to the receiving board 30.

[0090] In this embodiment, a case will be described in which the rotation angle of the transmission board 20 relative to the reception board 30 is detected based on a combination of sensor signals indicating magnetic field detection or non-detection of a magnetic field by the magnetic sensors 226-1, 226-2 as described below, but the present invention is not limited to this. The configuration of the detection unit that detects the rotation angle of the transmission board 20 relative to the reception board 30 can be a magnetic type, or other types such as an optical type or an electromagnetic induction type.

[0091] 5, the selector 104 converts the arrangement of the video signals when the rotation angle is 0° based on the sensor signal from the magnetic sensor 226-1 indicating detection of a magnetic field and the sensor signal from the magnetic sensor 226-2 indicating no detection of a magnetic field. Specifically, the selector 104 converts the signal arrangement so that the video signals V1, V2, V3, and V4 are transmitted to the video signal line pairs 206-1, 206-2, 206-3, and 206-4 of the transmitting board 20, respectively. In this case, since the antenna 210-i and the antenna 310-j face each other as described above, the video signals V1, V2, V3, and V4 are transmitted to the video signal line pairs 306-1, 306-2, 306-3, and 306-4 of the receiving board 30, respectively.

[0092] 6 shows a case where the transmitting board 20 is arranged and fixed at a rotation angle of 90° with respect to the receiving board 30. In the case shown in FIG. 6, the antenna 210-1 faces the antenna 310-2, the antenna 210-2 faces the antenna 310-3, the antenna 210-3 faces the antenna 310-4, and the antenna 210-4 faces the antenna 310-1. In this case, the magnetic sensor 226-1 detects the magnetic field of the magnet 326-2 facing it and outputs a sensor signal indicating the detection of the magnetic field, while the magnetic sensor 226-2 also detects the magnetic field of the magnet 326-1 facing it and outputs a sensor signal indicating the detection of the magnetic field. Each sensor signal is input to the selector 104 of the signal array conversion board 10 via the sensor signal lines 224-1, 224-2 and the cable 804, respectively.

[0093] 6, the selector 104 converts the arrangement of the video signals when the rotation angle is 90° based on the sensor signal indicating magnetic field detection from the magnetic sensor 226-1 and the sensor signal indicating magnetic field detection from the magnetic sensor 226-2. Specifically, the selector 104 converts the signal arrangement so that the video signals V2, V3, V4, and V1 are transmitted to the video signal line pairs 206-1, 206-2, 206-3, and 206-4 of the transmitting board 20, respectively. In this case, since the antenna 210-i and the antenna 310-j face each other as described above, the video signals V1, V2, V3, and V4 are transmitted to the video signal line pairs 306-1, 306-2, 306-3, and 306-4 of the receiving board 30, respectively.

[0094] 7 shows a case where the transmitting board 20 is arranged and fixed at a rotation angle of 180° with respect to the receiving board 30. In the case shown in FIG. 7, the antenna 210-1 faces the antenna 310-3, the antenna 210-2 faces the antenna 310-4, the antenna 210-3 faces the antenna 310-1, and the antenna 210-4 faces the antenna 310-2. In this case, the magnetic sensor 226-1 does not detect a magnetic field and outputs a sensor signal indicating no magnetic field detection, while the magnetic sensor 226-2 detects the magnetic field of the magnet 326-2 facing it and outputs a sensor signal indicating magnetic field detection. Each sensor signal is input to the selector 104 of the signal array conversion board 10 via the sensor signal lines 224-1 and 224-2 and the cable 804, respectively.

[0095] 7, the selector 104 converts the arrangement of the video signals when the rotation angle is 180° based on the sensor signal from the magnetic sensor 226-1 indicating no magnetic field is detected and the sensor signal from the magnetic sensor 226-2 indicating a magnetic field is detected. Specifically, the selector 104 converts the signal arrangement so that the video signals V3, V4, V1, and V2 are transmitted to the video signal line pairs 206-1, 206-2, 206-3, and 206-4 of the transmitting board 20, respectively. In this case, since the antenna 210-i and the antenna 310-j face each other as described above, the video signals V1, V2, V3, and V4 are transmitted to the video signal line pairs 306-1, 306-2, 306-3, and 306-4 of the receiving board 30, respectively.

[0096] 8 shows a case where the transmitting board 20 is arranged and fixed at a rotation angle of 270° with respect to the receiving board 30. In the case shown in FIG. 8, the antenna 210-1 faces the antenna 310-4, the antenna 210-2 faces the antenna 310-1, the antenna 210-3 faces the antenna 310-2, and the antenna 210-4 faces the antenna 310-3. In this case, the magnetic sensor 226-1 does not detect a magnetic field and outputs a sensor signal indicating that a magnetic field is not detected, while the magnetic sensor 226-2 does not detect a magnetic field and outputs a sensor signal indicating that a magnetic field is not detected. Each sensor signal is input to the selector 104 of the signal array conversion board 10 via the sensor signal lines 224-1 and 224-2 and the cable 804, respectively.

[0097] 8, the selector 104 converts the arrangement of the video signals when the rotation angle is 270° based on the sensor signal indicating non-detection of a magnetic field from the magnetic sensor 226-1 and the sensor signal indicating non-detection of a magnetic field from the magnetic sensor 226-2. Specifically, the selector 104 converts the signal arrangement so that the video signals V4, V1, V2, and V3 are transmitted to the video signal line pairs 206-1, 206-2, 206-3, and 206-4 of the transmitting board 20, respectively. In this case, since the antenna 210-i and the antenna 310-j face each other as described above, the video signals V1, V2, V3, and V4 are transmitted to the video signal line pairs 306-1, 306-2, 306-3, and 306-4 of the receiving board 30, respectively.

[0098] 5 to 8, antenna 222T and antenna 322R are arranged rotationally symmetrically and therefore face each other. Similarly, in any rotation, antenna 222R and antenna 322T are arranged rotationally symmetrically and therefore face each other. Therefore, in any rotation angle, bidirectional transmission of control signals can be realized in a non-contact interface, where a control signal is transmitted from antenna 222T to antenna 322R and a control signal is transmitted from antenna 322T to antenna 322R.

[0099] In this embodiment, regardless of the rotation angle, bidirectional transmission of control signals is performed by antennas 222T, 222R and the associated transmitter circuit 218 and receiver circuit 220, and antennas 322R, 322T and the associated receiver circuit 318 and transmitter circuit 320. Therefore, in this embodiment, it is not necessary to provide an antenna and an associated IC for each rotation angle in order to realize bidirectional transmission of control signals. Therefore, in this embodiment, when realizing bidirectional transmission of control signals via a rotatable interface formed by the transmission board 20 and the reception board 30, it is possible to simplify the design and reduce the device cost.

[0100] As described above, according to this embodiment, it is possible to realize two-way transmission of control signals via a rotatable interface while simplifying the design and reducing the device costs.

[0101] [Second embodiment] A display system according to a second embodiment of the present invention will be described with reference to Figures 9 to 11. Note that components similar to those in the display system according to the first embodiment are given the same reference numerals and descriptions thereof will be omitted or simplified.

[0102] In the above-mentioned first embodiment, the case where the transmitting board 20 has four antennas 210-i for video signals, the receiving board 30 has four antennas 310-j for video signals, and a four-lane video signal is transmitted has been described, but the present invention is not limited to this. The number of the antennas 210 corresponding to the antennas 210-i and the number of the antennas 310 corresponding to the antennas 310-j, and the number of components such as video signal lines corresponding to each antenna can be appropriately changed. In addition, the number of the antennas 210 and the number of the antennas 310 do not necessarily have to be the same, and either one can be made larger. This allows the transmitting board 20 to be rotated and arranged with respect to the receiving board 30 at a rotation angle other than every 90°.

[0103] In this embodiment, a configuration in which the transmitting board 20 can be rotated and arranged at a rotation angle of 45° with respect to the receiving board 30 will be described with reference to Figs. 9 to 11. Fig. 9(a) is a plan view showing the antenna arrangement of the transmitting board 20 according to this embodiment, and Fig. 9(b) is a plan view showing the antenna arrangement of the receiving board 30 according to this embodiment. Fig. 10(a) is a plan view showing a state in which the transmitting board 20 is arranged at a rotation angle of 0° with respect to the receiving board 30, and Fig. 10(b) is a perspective view corresponding to Fig. 10(a). Fig. 11(a) is a plan view showing a state in which the transmitting board 20 is arranged at a rotation angle of 45° with respect to the receiving board 30, and Fig. 11(b) is a perspective view corresponding to Fig. 11(a).

[0104] 9(a), the transmission board 20 has eight antennas 210 for transmitting video signals. In the following description and in FIGS. 9 to 11, the eight antennas 210 are distinguished by appropriately using the reference characters T1 to T8.

[0105] The eight antennas 210 are provided on the other surface (the surface on the back side of the paper in FIG. 9(a)) of the board body 202 of the transmission board 20. The eight antennas 210 are arranged at regular intervals on a circumference about a center point OT located outside the antennas 222T, 222R. The angle between the two diameters from the center point OT to two adjacent antennas 210 is 45°.

[0106] 9(b), the receiving board 30 has four antennas 310 for receiving video signals. In the following description and in FIGS. 9 to 11, the four antennas 310 are distinguished by appropriately using the reference characters R1 to R4.

[0107] The four antennas 310 are provided on one surface (the surface on the front side of the paper in FIG. 9(b)) of the board body 302 of the receiving board 30. The four antennas 310 are arranged at regular intervals on a circumference about a center point OR located outside the antennas 322R, 322T so that they can face any of the eight antennas 210. The angle between the two diameters from the center point OR to two adjacent antennas 310 is 90°.

[0108] 10(a) and 10(b), when the transmitting board 20 is disposed at a rotation angle of 0° with respect to the receiving board 30, the antenna 210 of the transmitting board 20 and the antenna 310 of the receiving board 30 transmit video signals while facing each other as follows: That is, antenna T1 faces antenna R1, antenna T3 faces antenna R2, antenna T5 faces antenna R3, and antenna T7 faces antenna R4.

[0109] 10(a) and 10(b), the selector 104 of the signal array conversion board 10 converts the array of video signals so that video signals V1, V2, V3, and V4 are transmitted from antennas T1, T3, T5, and T7, respectively. This allows the video signals V1, V2, V3, and V4 to be transmitted to antennas R1, R2, R3, and R4, respectively.

[0110] 11(a) and 11(b), when the transmitting board 20 is arranged at a rotation angle of 45° with respect to the receiving board 30, the antenna 210 of the transmitting board 20 and the antenna 310 of the receiving board 30 transmit video signals while facing each other as follows: antenna T8 faces antenna R1, antenna T2 faces antenna R2, antenna T4 faces antenna R3, and antenna T6 faces antenna R4.

[0111] 11(a) and 11(b), the selector 104 of the signal array conversion board 10 converts the array of video signals so that video signals V1, V2, V3, and V4 are transmitted from antennas T8, T2, T4, and T6, respectively. This allows the video signals V1, V2, V3, and V4 to be transmitted to antennas R1, R2, R3, and R4, respectively.

[0112] In this embodiment, in addition to the above, the transmitting board 20 can be arranged at a rotation angle of 90°, 135°, 180°, 225°, 270°, or 315° with respect to the receiving board 30. The selector 104 of the signal array conversion board 10 can convert the array of video signals transmitted from the antennas T8, T2, T4, and T6 in accordance with the rotation angle so that the video signals are transmitted to the antennas R1, R2, R3, and R4, respectively.

[0113] As in this embodiment, the transmitting board 20 can be rotated and arranged at rotation angles of 45° with respect to the receiving board 30. In addition to the above, the transmitting board 20 can be arranged at rotation angles other than 45° with respect to the receiving board 30 by changing the number of antennas 310.

[0114] [Modified embodiment] The present invention is not limited to the above-described embodiment, and various modifications are possible.

[0115] For example, in the above embodiment, the case where two antennas 222T, 222R for transmitting and receiving a control signal are provided in the transmission board 20 has been described, but the present invention is not limited to this. For example, the transmission board 20 may be provided with an additional antenna having a planar shape similar to that of the antennas 222T, 222R and at a different distance from the center point OT to be used for transmitting or receiving a control signal. In this case, the transmission board 20 may be provided with an additional control signal pair and a transmitter circuit or a receiver circuit corresponding to the additional antenna. In this way, one or more of the three or more antennas provided in the transmission board 20 may be used to transmit a control signal to the reception board 30, and the remaining antenna may be used to receive a control signal from the reception board 30.

[0116] In the above embodiment, the case where the two antennas 322R and 322T for transmitting and receiving the control signal are provided in the receiving board 30 has been described, but the present invention is not limited to this. For example, the receiving board 30 may be provided with an additional antenna having a planar shape similar to the antennas 322R and 322T and at a different distance from the center point OR, and used for transmitting or receiving the control signal. In this case, the receiving board 30 may be provided with an additional control signal pair and a receiver circuit or a transmitter circuit corresponding to the additional antenna. In this way, one or more of the three or more antennas provided in the receiving board 30 may be used to receive the control signal from the transmitting board 20, and the remaining antenna may be used to transmit the control signal to the transmitting board 20.

[0117] In the above embodiment, a case has been described in which bidirectional transmission of control signals is performed between the antennas 222T, 222R of the transmitting board 20 and the antennas 322R, 322T of the receiving board 30 in the display system 1, but the present invention is not limited to this. The antennas 222T, 222R and the antennas 322R, 322T can be widely used in cases in which bidirectional transmission of signals is performed in a rotatable non-contact interface in a system other than a display system. [Explanation of symbols]

[0118] 1. Display system 2. Image generating device 3. Transmission equipment 4. Display panel 10...Signal array conversion board 20…Transmitting board 30…Receiving board 40…Tcon board 50…Panel section 60…Source driver 70…Gate driver 104...Selector 206-i...Video signal line pair 208-i...Transmitter circuit 210-i…Antenna 212...Control signal lines 214…SerDes circuit 216T, 216R... Control signal line pair 218...Transmitter circuit 220...Receiver circuit 222T, 222R…Antenna 224-1, 224-2...Sensor signal lines 226-1, 226-2...Magnetic sensor 228...Magnet 306-j...Video signal line pair 308-j…Receiver circuit 310-j…Antenna 312...Control signal lines 314…SerDes circuit 316R, 316T... Control signal line pair 318...Receiver circuit 320...Transmitter circuit 322R, 322T…Antenna 326…Magnet 326-1, 326-2...Magnet 328…Magnet 404...Timing controller

Claims

1. a first interface device having a first antenna group arranged around a first center point, the first antenna group being rotatable around the first center point, the first antenna and a second antenna being at a different distance from the first antenna to the first center point; a second interface device including a second antenna group arranged around a second center point, the second antenna group being rotatable around the second center point, a third antenna, and a fourth antenna at a different distance from the third antenna to the second center point; the first interface device is rotatable with respect to the second interface device about the first center point, which coincides with the second center point in a plan view, as a rotation center; when the first center point and the second center point coincide with each other in a plan view, the first antenna faces the third antenna such that a first signal is transmitted from the first antenna to the third antenna, and the second antenna faces the fourth antenna such that a second signal is transmitted from the fourth antenna to the second antenna, the first antenna has a first planar shape obtained by partially deforming a first shape that is rotationally symmetric with respect to the first central point; the second antenna has a second planar shape obtained by partially deforming a second shape that is rotationally symmetric with respect to the first central point; the third antenna has a third planar shape obtained by partially deforming a third shape that is rotationally symmetric with respect to the second central point; The fourth antenna has a fourth planar shape obtained by partially deforming a fourth shape that is rotationally symmetric with respect to the second center point. A transmission device comprising:

2. The first to fourth shapes are each a circle or a regular polygon ring shape.

2. The transmission device according to claim 1.

3. The first antenna and the second antenna are capable of transmitting or receiving at the same transmission rate, The third antenna and the fourth antenna are capable of transmitting or receiving at the same transmission rate.

3. The transmission device according to claim 1, wherein the first and second inputs are connected to the first and second inputs.

4. The first interface device is a first amplifier that amplifies the first signal transmitted from the first antenna; a second amplifier for amplifying the second signal received by the second antenna; The second interface device is a third amplifier for amplifying the first signal received by the third antenna; a fourth amplifier for amplifying the second signal transmitted from the fourth antenna.

4. The transmission device according to claim 1, wherein the first and second inputs are connected to the first and second inputs.

5. the first interface device has a first substrate on which the first antenna group is provided; the second interface device has a second substrate on which the second antenna group is provided; The first substrate is held rotatably with respect to the second substrate about the first center point, which coincides with the second center point in a plan view.

5. A transmission device according to claim 1, wherein the first and second inputs are connected to the first and second inputs.

6. the first interface device has a plurality of fifth antennas arranged rotationally symmetrically about the first center point; the second interface device has a plurality of sixth antennas arranged rotationally symmetrically about the second center point; When the first center point and the second center point coincide with each other in a plan view, any one of the plurality of fifth antennas faces any one of the plurality of sixth antennas such that a third signal is transmitted from any one of the plurality of fifth antennas to any one of the plurality of sixth antennas.

6. A transmission device according to claim 1, wherein the first and second inputs are connected to the first and second inputs.

7. the first signal is a first control signal; the second signal is a second control signal; The third signal is a video signal.

7. The transmission device according to claim 6.

8. A transmission device as described in claim 1, wherein the first signal is transmitted non-contact from the first antenna to the third antenna, and the second signal is transmitted non-contact from the fourth antenna to the second antenna.

9. A first interface device having a first antenna group arranged around a first central point, the first antenna group being rotatable around the first central point, the first antenna and a second antenna being at a different distance from the first central point; a second interface device having a second antenna group arranged around a second center point, the second antenna group being rotatable around the second center point, the second interface device including a third antenna and a fourth antenna at a different distance from the third antenna to the second center point; a detection unit for detecting a rotation angle of the first interface device relative to the second interface device, the first interface device is rotatable with respect to the second interface device about the first center point, which coincides with the second center point in a plan view, as a rotation center; When the first center point and the second center point coincide with each other in a plan view, the first antenna faces the third antenna so that a first signal is transmitted from the first antenna to the third antenna, and the second antenna faces the fourth antenna so that a second signal is transmitted from the fourth antenna to the second antenna. A transmission device comprising:

10. A display panel; a drive device that transmits a video signal of a video to be displayed on the display panel to the display panel, transmits a first control signal to the display panel, and receives a second control signal from the display panel; a transmission device connecting the display panel and the drive device, The transmission device includes: a first interface device having a first antenna group arranged around a first center point, the first antenna group being rotatable around the first center point, the first antenna and a second antenna being at a different distance from the first antenna to the first center point; a second interface device including a second antenna group arranged around a second center point, the second antenna group being rotatable around the second center point, a third antenna, and a fourth antenna at a different distance from the third antenna to the second center point; the first interface device is rotatable with respect to the second interface device about the first center point, which coincides with the second center point in a plan view, as a rotation center; when the first center point and the second center point coincide with each other in a plan view, the first antenna faces the third antenna such that the first control signal is transmitted from the first antenna to the third antenna, and the second antenna faces the fourth antenna such that the second control signal is transmitted from the fourth antenna to the second antenna, the first antenna has a first planar shape obtained by partially deforming a first shape that is rotationally symmetric with respect to the first central point; the second antenna has a second planar shape obtained by partially deforming a second shape that is rotationally symmetric with respect to the first central point; the third antenna has a third planar shape obtained by partially deforming a third shape that is rotationally symmetric with respect to the second central point; The fourth antenna has a fourth planar shape obtained by partially deforming a fourth shape that is rotationally symmetric with respect to the second center point. A display system comprising:

11. The first to fourth shapes are each a circle or a regular polygon ring shape.

11. The display system of claim 10.

12. The first antenna and the second antenna are capable of transmitting or receiving at the same transmission rate, The third antenna and the fourth antenna are capable of transmitting or receiving at the same transmission rate.

12. A display system according to claim 10 or 11.

13. The first interface device is a first amplifier that amplifies the first control signal transmitted from the first antenna; a second amplifier for amplifying the second control signal received by the second antenna; The second interface device is a third amplifier for amplifying the first control signal received by the third antenna; a fourth amplifier that amplifies the second control signal transmitted from the fourth antenna.

13. A display system according to any one of claims 10 to 12.

14. the first interface device has a first substrate on which the first antenna group is provided; the second interface device has a second substrate on which the second antenna group is provided; The first substrate is held rotatably with respect to the second substrate about the first center point, which coincides with the second center point in a plan view.

14. A display system according to any one of claims 10 to 13.

15. the first interface device has a plurality of fifth antennas arranged rotationally symmetrically about the first center point; the second interface device has a plurality of sixth antennas arranged rotationally symmetrically about the second center point; When the first center point and the second center point are aligned in a plan view, any one of the plurality of fifth antennas faces any one of the plurality of sixth antennas such that the video signal is transmitted from any one of the plurality of fifth antennas to any one of the plurality of sixth antennas.

15. A display system according to any one of claims 10 to 14.

16. A display panel; a drive device that transmits a video signal of a video to be displayed on the display panel to the display panel, transmits a first control signal to the display panel, and receives a second control signal from the display panel; a transmission device connecting the display panel and the drive device, The transmission device includes: a first interface device having a first antenna group arranged around a first center point, the first antenna group being rotatable around the first center point, the first antenna and a second antenna being at a different distance from the first antenna to the first center point; a second interface device having a second antenna group arranged around a second center point, the second antenna group being rotatable around the second center point, the second interface device including a third antenna and a fourth antenna at a different distance from the third antenna to the second center point; a detection unit for detecting a rotation angle of the first interface device relative to the second interface device; a conversion unit that converts an arrangement of the video signals in accordance with the rotation angle; having the first interface device is rotatable with respect to the second interface device about the first center point, which coincides with the second center point in a plan view, as a rotation center; When the first center point and the second center point coincide with each other in a plan view, the first antenna faces the third antenna such that the first control signal is transmitted from the first antenna to the third antenna, and the second antenna faces the fourth antenna such that the second control signal is transmitted from the fourth antenna to the second antenna. A display system comprising:

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