JP2011247917A - Display system and control method for display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display system and a control method for the display system which can be controlled through wireless communication with a simple configuration.SOLUTION: Among a plurality of display devices connected in series, a display device 2 determines whether the device 2 is connected at an upstream side or not. The display device 2 enables wireless communication with a remote controller 20 when determining that the device 2 is connected to the upstream side, and disables the wireless communication with the remote controller 20 when determining that the device 2 is not connected at an upstream side.

Description

  The present invention relates to a display system in which a plurality of display devices are connected in series, and a control method for the display system.

  A multi-display system arranges a plurality of display devices in a single line, a matrix, etc., and displays various images by dividing one image and linking images displayed on the respective display devices. It is a display system applicable to an aspect.

  In the connection method of connecting a plurality of display devices, other devices are connected to the central device, the central device controls the other devices collectively, the so-called star connection method, the multiple devices are connected in series, There is a so-called daisy chain connection method that sequentially outputs control commands from the most upstream device to the downstream device.

  In such a display system, for example, when image quality adjustment of each display device is performed, an adjustment command is input to the central device or the most upstream device to adjust the image quality of the display device to be adjusted. I do.

  The adjustment command may be input from a central device or an input device wired to the most upstream device, but a command input device for remote control that is input by wireless communication using infrared rays, so-called remote control. It is easier to use the controller.

  Since the display system uses a plurality of display devices having the same specifications, it is difficult to input a command only to the display device to be controlled by the command when a command is input by the remote controller. Infrared light emitted from the remote controller propagates in the air while spreading at a predetermined angle, so when there are a plurality of infrared light receiving portions of the display device at a short distance, the emitted infrared light is received by the plurality of light receiving portions, The same command is input to a plurality of display devices.

  Further, as the number of display devices increases, it is necessary to adjust individual display devices in accordance with the overall state, and in order to overlook the whole, it is necessary to make adjustments while confirming the whole away from the display device. However, when the display device is separated from the display device, the effective range of infrared rays expands, and the same command is input to more display devices.

  Patent Document 1 discloses a configuration including a slave control unit that has a panel ID for each screen and performs display screen adjustment, and a master control unit that controls the whole. Patent Document 2 discloses a configuration in which a specific display is adjusted by an external operation by setting a display ID that can set an identification number unique to each display. Patent Document 3 discloses a configuration in which detailed information screens for adjustment are displayed all at once in response to a command from a remote controller based on an ID number, and a screen is displayed only on a specific display device corresponding to the ID number by key operation of the remote controller. A configuration for displaying an adjustment menu is disclosed.

JP 2001-275137 A Japanese Patent Laid-Open No. 2004-211986 JP 2006-254275 A

  In the invention described in Patent Document 1, the slave must be connected to the master, and when the configuration of the multi-display is changed, it is necessary to additionally connect the master control unit and the slave control unit. Therefore, it is necessary to change both the hardware and software, and the master control unit must be changed, so that the configuration change is difficult.

  In the invention described in Patent Document 2, when all the displays are set in the same manner, it is necessary to set the number of displays constituting the multi-display.

  The invention described in Patent Document 3 causes a menu to be displayed on a display to be adjusted, which causes problems such as difficulty in adjustment.

  As described above, the display system is difficult to control by wireless communication, and the configuration for control is complicated.

  An object of the present invention is to provide a display system and a control method for the display system that can be controlled by wireless communication with a simple configuration.

The present invention is a display system having a plurality of display devices connected in series so that wired communication is possible, and a remote control device that inputs command information to the display device by wireless communication,
The display device
Display means for displaying an image;
Wired communication means for performing wired communication with other display devices;
Wireless communication means for performing wireless communication with the remote display device;
Of a plurality of display devices connected in series, connection determination means for determining whether the device is connected to the upstream side; and
When it is determined by the connection determination means that the own device is connected to the upstream side, the operation of the wireless communication means is validated, and when it is determined that the own device is not connected to the upstream side, And a control unit that disables the operation of the wireless communication unit.

The present invention further includes a communication cable for wired communication between the display devices,
The wired communication means is a connector connected to the communication cable, an input connector for inputting an electric signal from the communication cable, and a connector connected to the communication cable, and the electric signal is supplied to the communication cable. An output connector for outputting,
The connection determination means includes detection means for detecting whether or not the communication cable is connected to the input connector of the own device and an output connector of another display device, and the communication cable is connected to the own device. When it is not detected that the input connector is connected to the output connector of another display device, it is determined that the own device is connected upstream, and the communication cable is connected to the input connector of the own device and the other When it is detected that it is connected to the output connector of the display device, it is determined that the device is not connected to the upstream side.

Moreover, the present invention further includes a target determination unit that determines whether or not the target of the command information input by wireless communication from the remote control device is the own device,
When the control unit of the display device connected to the upstream side determines that the target of the command information input by the target determination unit is not its own device, another display device connected to the downstream side by wire On the other hand, the command information is transferred by operating the wired communication means.

In the present invention, the command information includes identification information indicating a target display device,
The display device generates the identification information of the device itself and transmits instruction information for instructing the downstream display device to generate the identification information of the device by operating the wired communication unit. It is characterized by that.

  In the invention, it is preferable that the communication cable is a cable compliant with the RS-232C standard.

  According to the present invention, the command information includes an image quality adjustment command for adjusting an image quality of an image displayed by the display means.

The present invention is also a control method for controlling a display system having a plurality of display devices connected in series so as to be capable of wired communication and a remote control device that inputs command information to the display device by wireless communication. And
The display device is a determination step of determining whether the device is connected to the upstream side among a plurality of display devices connected in series;
When it is determined that the own device is connected to the upstream side, the wireless communication with the remote control device is enabled, and when it is determined that the own device is not connected to the upstream side, the remote control device And a communication control step for disabling wireless communication with the display system.

  According to the present invention, there is provided a display system having a plurality of display devices connected in series so as to be capable of wired communication and a remote control device for inputting command information to the display device by wireless communication.

  The connection determination means determines whether or not the own device is connected to the upstream side among the plurality of display devices connected in series.

  When it is determined that the own device is connected to the upstream side based on the determination result of the connection determining unit, the control unit validates the operation of the wireless communication unit, and the own device is connected to the upstream side. When it is determined that there is no such operation, the operation of the wireless communication means is invalidated.

  As a result, only the display device connected to the upstream side is configured to be able to input the command information from the remote display device, so the command information is input to the other downstream display devices constituting the display system. In addition, the display system can be controlled by wireless communication with a simple configuration.

  According to the invention, the wired communication means is a connector connected to the communication cable, an input connector for inputting an electric signal from the communication cable, and a connector connected to the communication cable, An output connector for outputting an electrical signal to the communication cable, wherein the connection determination means is connected to the input connector of the own device and an output connector of another display device. Detecting means for detecting whether or not the communication cable is connected to the input connector of the own device and the output connector of another display device, the own device is connected to the upstream side. When it is detected that the communication cable is connected to the input connector of its own device and the output connector of another display device, Device is determined not to be connected to the upstream side.

  Thereby, it can be determined whether the own apparatus is connected to the upstream side based on the connection with the connector.

  Further, according to the present invention, the object determining means determines whether or not the target of the command information input from the remote control device by wireless communication is its own device, and the display device connected to the upstream side When the control unit determines that the target of the input command information is not its own device based on the determination result of the target determination unit, the wired communication is performed with respect to another display device connected to the downstream side by wired connection. The command information is transferred by operating the means.

  Thereby, the command information input to the display device connected upstream can be input to the target display device downstream by wired communication.

According to the invention, the identification information of the device itself is generated, and the command information for instructing the downstream display device to generate the identification information of the device is operated by operating the wired communication means. Send.
Thereby, identification information can be automatically generated by each display device.

  Moreover, according to this invention, the cable based on RS-232C specification can be used as said communication cable.

  According to the invention, since the command information includes an image quality adjustment command for adjusting the image quality of the image displayed by the display means, the image quality of each display device is adjusted by the remote control device in the display system. Can do.

  According to the present invention, there is also provided a control method for controlling a display system having a plurality of display devices connected in series so as to be capable of wire communication and a remote control device for inputting command information to the display device by wireless communication. It is.

  In the pre-determination step, the display device determines whether or not its own device is connected to the upstream side among the plurality of display devices connected in series. In the communication control step, the display device is connected to the upstream side. When it is determined that the wireless communication with the remote control device is enabled, the wireless communication with the remote control device is disabled when it is determined that the device is not connected to the upstream side. To do.

  As a result, only the display device connected to the upstream side is configured to be able to input the command information from the remote display device, so the command information is input to the other downstream display devices constituting the display system. In addition, the display system can be controlled by wireless communication with a simple configuration.

1 is a schematic diagram illustrating a configuration of a display system 1. FIG. 3 is a block diagram illustrating a configuration of a display device 2. FIG. FIG. 3 is a diagram illustrating terminal configurations of an input connector 10 and an output connector 12. 2 is an external view of a remote controller 20. FIG. 3 is a diagram illustrating a circuit configuration for invalidating an input from a remote controller 20. FIG. 4 is a flowchart showing a determination process for invalidating an input from a remote controller 20. 4 is a flowchart showing image quality adjustment processing of the most upstream display device 2. 4 is a flowchart showing image quality adjustment processing of the most upstream display device 2. 4 is a flowchart showing image quality adjustment processing of the most upstream display device 2. It is a flowchart which shows the image quality adjustment process of downstream display apparatus 3,4,5. It is a flowchart which shows the image quality adjustment process of downstream display apparatus 3,4,5. It is a flowchart which shows the image quality adjustment process of downstream display apparatus 3,4,5.

  In the display system of the present invention, a plurality of display devices are connected in series, that is, a so-called daisy chain connection, and predetermined command information is output from the display device connected to the most upstream to the display device connected downstream. The display device in which the command information is input from the upstream display device further outputs the command information to the downstream display device.

  The display devices are connected by a wired connection, for example, using an RS-232C standard cable (hereinafter referred to as “RS-232C cable” or simply “cable”). The RS-232C cable is connected to a signal input cable connection connector (hereinafter referred to as “input connector”) or a signal output cable connection connector (hereinafter referred to as “output connector”) provided in the display device. The In the case of serial connection, one of the RS-232C cables is connected to the output connector of the upstream display device, and the other is connected to the input connector of the downstream display device.

  The command information input to the upstream display device is output from the output connector of the upstream display device as an electrical signal indicating the command information, and is sent to the input connector of the downstream display device via the RS-232C cable. Entered.

FIG. 1 is a schematic diagram showing the configuration of the display system 1.
The display system 1 includes a plurality of display devices 2, 3, 4, 5, an RS-232C cable 6 and a remote controller 20. The plurality of display devices 2, 3, 4, and 5 are connected in series via the RS-232C cable 6. The display device 2 is a display device arranged at the uppermost stream, and the display device 3, the display device 4, and the display device 5 are sequentially connected downstream.

The remote controller 20 can input various control information including command information to all display devices constituting the display system 1 through wireless communication such as infrared communication.
The cable 6 is not connected to the input connector of the most upstream display device 2, and the RS-232C cable 6 is connected to the output connector. The cable 6 connected to the output connector of the display device 2 is connected to the input connector of the display device 3 that is one downstream from the display device 2. The cable 6 connected to the output connector of the display device 3 is connected to the input connector of the display device 4 that is one downstream from the display device 3. The cable 6 connected to the output connector of the display device 4 is connected to the input connector of the display device 5 that is one downstream from the display device 4.

  Each of the display devices 2, 3, 4, and 5 is configured to be able to detect whether or not the cable 6 is connected to the input connector. Based on the detection result of the input connector, when the cable 6 is not connected to the input connector, the display device is not connected upstream from the own device, so the own device is connected to the most upstream side in series connection. Recognize that Based on the detection result of the input connector, when the cable is connected to the input connector, the display device is connected to the upstream side of the own device, so the own device is connected to the downstream side in series connection Recognize that.

  FIG. 2 is a block diagram illustrating a configuration of the display device 2. Since the display devices 2, 3, 4, and 5 are all display devices having the same specifications and have the same configuration, FIG. 2 shows the configuration of the display device 2 as an example.

  The display device 2 includes a display 7, a light receiving unit 8, a video signal input connector 9, an input connector 10, an input RS-232C interface 11, an output connector 12, an output RS-232C interface 13, a first memory 14, and a second memory. The memory 15 and the control unit 16 are included.

  The display 7 is a display panel that displays image data, such as a liquid crystal display panel, a plasma display panel, or an organic EL display panel. The light receiving unit 8 receives radio communication radio waves such as infrared rays output from the remote controller 20. The video signal input connector 9 is connected to a video signal cable in order to input image data to be displayed on the display unit 7. The input connector 10 is a connector to which the RS-232C cable 6 is connected. The input RS-232C interface 11 (hereinafter referred to as “input interface”) outputs input information to the control unit 16 based on an electrical signal input from the cable 6 connected to the input connector 10. . The output connector 12 is a connector to which the RS-232C cable 6 is connected. The output RS-232C interface 13 (hereinafter referred to as “output interface”) outputs an electrical signal to the cable 6 connected to the output connector 12 based on information output from the control unit 16.

  The first memory 14 temporarily stores various information such as OSD (On Screen Display) information and cable connection information. The second memory 15 stores various operation control programs such as a display control program for displaying image data and a connection control program when connected in series.

  The control unit 16 integrates a display control circuit, an OSD circuit, and the like, and controls the operation of the entire display device based on an operation control program stored in the second memory 15.

FIG. 3 is a diagram illustrating terminal configurations of the input connector 10 and the output connector 12.
In the present embodiment, as the input connector 10 and the output connector 12, D-subminiature 9-pin connectors conforming to the RS-232C standard are used. The input connector 10 has pins A1 to A9, and the output connector 12 has pins B1 to B9. It is detected whether or not the cable 6 is connected to the input connector 10 by using pins A9 and B9 (Ring terminals) which are unused terminals among these pins.

  The pin B9 of the output connector 12 is connected to the 5V power source via the diode D. The pin A9 of the input connector 10 is connected to the control unit 16 via the detection wiring 17. The detection wiring 17 is grounded via a pull-down resistor R.

  The control unit 16 detects that the downstream display device is connected to the input connector 10 via the cable 6 based on the voltage level of the detection wiring 17.

  In the display device 2, since the cable 6 is not connected to the input connector 10, the voltage level of the detection wiring 17 is set to the low level (0 V) by the pull-down resistor R. In the display device 3, the cable 6 is connected to the input connector 10, and the cable 6 connected to the input connector 10 is connected to the output connector 12 of the upstream display device 2. Therefore, the pin B9 of the output connector 12 of the display device 2 and the pin A9 of the input connector 10 of the display device 3 are connected via the cable 6, and the voltage level of the detection wiring 17 in the display device 3 is the High level (5V )

  Based on the voltage level of the detection wiring 17, the control unit 16 detects that the device is the most upstream display device if the level is low, and if the level is high, the device 16 is downstream via the cable 6. It is detected that the display device is connected to the side.

  The voltage level of the detection wiring 17 or the detection result based on the voltage level of the detection wiring 17 is stored in the first memory 14 as cable connection information.

  The display devices 2, 3, 4, and 5 invalidate the input of command information from the remote controller 20 based on the cable connection information. When the display devices 2, 3, 4, and 5 are not connected in series, it is necessary to be able to input command information from the remote controller 20, and in the connected state, the most upstream display device is required. Only 2 can input the command information from the remote controller 20, and the downstream display devices 3, 4, and 5 disable the command information input from the remote controller 20. Since the display device 2 recognizes that the device itself is in the most upstream based on the cable connection information, the input from the remote controller 20 can be enabled. Since the display devices 3, 4, and 5 recognize that the own device is on the downstream side based on the cable connection information, the input from the remote controller 20 can be invalidated.

  When command information is input from the remote controller 20 to the display device 2, at least one of the display devices 3, 4, and 5 is located within the radio communication radio wave output range output from the remote controller 20. However, since the input from the remote controller 20 is invalid in the display devices 3, 4, and 5, no command information is input from the remote controller 20. Command information can be input from the remote controller 20 only to the most upstream display device 2.

  Thereby, command information can be input from the remote controller 20 only to the display device 2 connected to the most upstream among the plurality of display devices 2, 3, 4, and 5 constituting the display system 1.

  When it is desired to input command information to the display devices 3, 4, and 5, the command information is once input to the display device 2, and the display device 3, 4, 5 that is the input target is input Until then, the command information may be transferred via the cable 6.

  FIG. 4 is an external view of the remote controller 20. The remote controller 20 has the same configuration as the existing one. Various keys such as a power key 21 for inputting command information relating to power on / off, a menu key 22 for performing settings based on OSD such as image quality adjustment, and a cursor key 23 for changing numerical values and items are provided. When these keys are pressed, infrared rays based on command information corresponding to the pressed keys are emitted.

  FIG. 5 is a diagram showing a circuit configuration for invalidating the input from the remote controller 20. The output from the light receiving unit 8 is not directly input to the control unit 16 but is input to the determination circuit 8a. Further, the IR_EN signal based on the cable connection information is input to the determination circuit 8a. IR_EN = 0 is input when the cable 6 is not connected, and IR_EN = 1 is input when the cable 6 is connected. The determination circuit 8a outputs an output signal from the light receiving unit 8 to the control unit 16 when IR_EN = 0 is input, and outputs an output signal from the light receiving unit 8 to the control unit 16 when IR_EN = 1 is input. Do not output.

  FIG. 6 is a flowchart showing a determination process for invalidating the input from the remote controller 20.

  In Step A1, a Cable_ck value indicating cable connection information is stored in the first memory 14. In step A2, it is determined whether the Cable_ck value is 1 or 0. If the Cable_ck value is 0, it is determined that the cable 6 is not connected, and the process proceeds to step A3, where IR_EN = 0 is output and the signal from the light receiving unit 8 is validated. In step A4, the display device operates as the most upstream display device. . If the Cable_ck value is 1, it is determined that the cable 6 is connected, and the process proceeds to step A5, where IR_EN = 1 is output to invalidate the signal from the light receiving unit 8, and the downstream display device operates in step A6. .

Hereinafter, an example in which image quality adjustment by OSD is performed will be described.
7A to 7C are flowcharts showing image quality adjustment processing of the most upstream display device 2. 8A to 8C are flowcharts showing image quality adjustment processing of the downstream display devices 3, 4, and 5.

  First, the image quality adjustment processing of the most upstream display device 2 will be described. In step S1, it is determined whether or not a display ID for identifying the device itself has been set. If not set, ID = 0 is set in step S2, and if set, the process proceeds to step S3, and the display ID is incremented by one. In step S4, a command for distributing the display ID is issued to the downstream display device. In step S5, the process waits until a return signal is received from the downstream display device. When the return signal is received, the display ID information received from the downstream display device is stored in the first memory 14 in step S6. When it is detected in step S7 that the menu key 22 of the remote controller 20 has been pressed, in step S8, OSD display is performed on the display 7 for image quality adjustment. In step S9, a display command for displaying the OSD is issued to the downstream display device. In step S10, the process waits until a return signal is received from the downstream display device.

  Here, a display device to be subjected to image quality adjustment is selected by operating the remote controller 20. Any of the display devices 2, 3, 4, and 5 can be selected as the target display device. The display device is selected by OSD processing, and can be selected by inputting a display ID, for example.

  In step S11, the selected display ID is set, and it is determined whether or not the display ID of the own device is set in step S12. If it is the display ID of the own device, the process proceeds to step S15, and if it is not the display ID of the own device, the process proceeds to step S13. In step S13, a command for specifying the set display ID and acquiring OSD information is issued to the downstream display device. In step S14, the process waits until a return signal is received from the downstream display device.

  In step S15, the set display ID and OSD information are stored in the first memory 14, and in step S16, the stored OSD information is displayed on the display 7 and the cursor is moved to the next item. In step S17, parameter change information of OSD information is input based on command information from the remote controller 20. In step S18, the OSD information whose parameters have been changed is updated in the first memory 14. In step S19, it is determined whether a display ID designation change has been input from the remote controller 20. If changed, the process proceeds to step S20, and if not changed, the process proceeds to step S24. In step S20, the changed display ID is added, and the process proceeds to step S21. In step S21, it is determined whether or not the display ID is the display ID of the own apparatus. If the display ID is the display ID of the own apparatus, the process proceeds to step S27. If it is not the display ID of the own device, the process proceeds to step S22, and a command for changing the parameter by adding the display ID is issued to the downstream display device. In step S23, the process waits until a return signal is received from the downstream display device.

  In step S24, the process proceeds to step S25 without adding a display ID. In step S25, a command for changing a parameter without adding a display ID is issued to the downstream display device. In step S26, the process waits until a return signal is received from the downstream display device. The processing in steps S24 and S25 is processing when a command for adjusting the image quality of all the display devices at once is input by the remote controller 20. In such batch processing, the display device to be adjusted is selected. Only the parameter change command is issued downstream without adding the display ID shown.

  In step S27, it is determined whether or not to end the image quality adjustment based on the input from the remote controller 20, and if finished, the process proceeds to step S28, and if not finished, the process returns to step S17.

  In step S28, the process waits until the menu key 22 of the remote controller 20 is pressed. When the menu key 22 is pressed, the OSD information of the display unit 7 is hidden in step S29. In step S30, a command to hide the OSD is issued to the downstream display device. In step S31, the process waits until a return signal is received from the downstream display device.

Next, the image quality adjustment processing of the downstream display device 3 will be described.
In step S40, the process waits until a display ID distribution command is received from the display device 2. When the command is received, the process proceeds to step S41. In step S41, it is determined whether or not the display ID has been set. If it has been set, the process proceeds to step S43. If not, the display ID is set in step S42. In step S43, the display ID is incremented by one. In step S44, a command for assigning the display ID is issued to a further downstream display device. In step S45, a return signal is received from the downstream display device, or the process waits until a predetermined time elapses without receiving the return signal. If a downstream display device is not connected, a return signal cannot be received, and therefore processing proceeds as a timeout after a predetermined time has elapsed. In step S46, the set display ID is added and a return signal is issued to the upstream display device.

  In step S47, the process waits until an OSD display command is received from the upstream display device. When the command is received, the display ID of the device itself is displayed on the display unit 7 in step S48. In step S50, a return signal is received from the downstream display device, or the process waits until a predetermined time elapses without receiving the return signal.

  The original display device performs OSD display when an OSD display command is input, but the downstream display device does not perform OSD display itself, and only the most upstream display device performs OSD display. Instead, the downstream display device that has received the OSD display command causes the display 7 to display the display ID of its own device so that the user who performs image quality adjustment can easily recognize the display ID of the target display device. indicate. At this time, the display color of the display ID is displayed in blue, for example.

  In step S51, the process waits until a command for acquiring OSD information is received from the upstream display device. When the command is received, in step S52, it is determined whether or not the display ID added to the command matches the display ID of the own device. to decide. If they match, the process proceeds to step S53, and if they do not match, the process proceeds to step S55.

  If the display ID matches the display ID of the own device, the display device is the display device whose image quality is to be adjusted. In step S53, the display color of the display ID is changed from blue to red to indicate that it is the target. Then, the display ID of the own device and the OSD information of the own device are added, and a return signal is issued to the upstream display device. In step S54, a return signal is received from the downstream display device, or the process waits until a predetermined time elapses without receiving the return signal.

  In step S55, since the own device is not the target, the received display ID and a command for obtaining OSD information are issued to the display device further downstream. In step S56, a return signal is received from the downstream display device, or the process waits until a predetermined time elapses without receiving the return signal.

  In step S57, the process waits until a command for changing the parameter of the OSD information is received from the upstream display device, and if received, the process proceeds to step S58. In step S58, it is determined whether or not a display ID is added to the change command. If added, the process proceeds to step S59, and if not added, the process proceeds to step S64.

  When the display ID is added, not the batch adjustment but the display device to be adjusted is designated. When no display ID is added, it is a batch adjustment, and all display devices are objects of adjustment.

  In step S59, it is determined whether or not the added display ID matches the display ID of the own device. If they match, the process proceeds to step S60, and if they do not match, the process proceeds to step S67. In step S60, the parameter of the OSD information stored in the first memory 14 is updated according to the received change command. In step S61, image quality adjustment is performed based on the updated OSD information. In step S62, after adjusting the image quality, a return signal is issued to the upstream display device. In step S63, a return signal is received from the downstream display device, or the process waits until a predetermined time elapses without receiving the return signal.

  In step S64, the parameter of the OSD information stored in the first memory 14 is updated according to the received change command. In step S65, image quality adjustment is performed based on the updated OSD information. In step S66, after adjusting the image quality, a command for changing the parameter is issued to the downstream display device without adding the display ID. In step S67, a command for changing the parameter by adding the received display ID is issued to a further downstream display device. In step S68, a return signal is received from the downstream display device, or the process waits until a predetermined time elapses without receiving the return signal. In step S69, a return signal is issued to the upstream display device, and the process proceeds to step S63.

  In step S70, the process waits until a command for hiding the OSD from the upstream display device is received, and when received, the OSD is hidden in step S71, that is, the display ID of the displayed own device is not displayed. And In step S72, a command for hiding the OSD is issued to a further downstream display device. In step S <b> 73, a return signal is received from the downstream display device, or the process waits until a predetermined time elapses without receiving the return signal.

DESCRIPTION OF SYMBOLS 1 Display system 2, 3, 4, 5 Display apparatus 6 RS-232C cable 7 Display 8 Light-receiving part 9 Video signal input connector 10 Input connector 11 RS-232C interface for input 12 Output connector
13 RS-232C interface for output 14 1st memory 15 2nd memory 16 Control part

Claims (7)

A display system comprising a plurality of display devices connected in series so as to be capable of wired communication, and a remote control device for inputting command information to the display device by wireless communication,
The display device
Display means for displaying an image;
Wired communication means for performing wired communication with other display devices;
Wireless communication means for performing wireless communication with the remote display device;
Of a plurality of display devices connected in series, connection determination means for determining whether the device is connected to the upstream side; and
When it is determined by the connection determination means that the own device is connected to the upstream side, the operation of the wireless communication means is validated, and when it is determined that the own device is not connected to the upstream side, And a control means for invalidating the operation of the wireless communication means. It further includes a communication cable for wired communication between the display devices,
The wired communication means is a connector connected to the communication cable, an input connector for inputting an electric signal from the communication cable, and a connector connected to the communication cable, and the electric signal is supplied to the communication cable. An output connector for outputting,
The connection determination means includes detection means for detecting whether or not the communication cable is connected to the input connector of the own device and an output connector of another display device, and the communication cable is connected to the own device. When it is not detected that the input connector is connected to the output connector of another display device, it is determined that the own device is connected upstream, and the communication cable is connected to the input connector of the own device and the other 2. The display system according to claim 1, wherein when it is detected that the display device is connected to the output connector of the display device, the display device determines that the device is not connected to the upstream side. The display device further includes target determination means for determining whether the target of the command information input from the remote control device by wireless communication is the own device,
When the control unit of the display device connected to the upstream side determines that the target of the command information input by the target determination unit is not its own device, another display device connected to the downstream side by wire The display system according to claim 2, wherein the command information is transferred by operating the wired communication means. The command information includes identification information indicating a target display device,
The display device generates the identification information of the device itself and transmits instruction information for instructing the downstream display device to generate the identification information of the device by operating the wired communication unit. The display system according to claim 3.   The display system according to any one of claims 2 to 4, wherein the communication cable is a cable compliant with the RS-232C standard.   6. The display system according to claim 1, wherein the command information includes an image quality adjustment command for adjusting an image quality of an image displayed by the display unit. A control method for controlling a display system having a plurality of display devices connected in series so as to enable wired communication and a remote control device that inputs command information to the display device by wireless communication,
The display device is a determination step of determining whether the device is connected to the upstream side among a plurality of display devices connected in series;
When it is determined that the own device is connected to the upstream side, the wireless communication with the remote control device is enabled, and when it is determined that the own device is not connected to the upstream side, the remote control device And a communication control step of disabling wireless communication with the display system.

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