JP2007298754A - Large video display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a large video display device in which reliability is improved to a failure of a transmission part of a display unit and that of cables between the units. <P>SOLUTION: In the large video display part 3, display data are supplied to two or more display units 9 of each display unit group 31 by inter-unit data transmission. A first data transmission path 33 and a second data transmission path 35 are established for each display unit group 31, and they are in inverse direction. Each display unit 9 acquires a display data from an upstream side display unit 9 along the first data transmission path 33 and sends the display data to a downstream side display unit 9, also acquires the display data from the upstream side display unit 9 along the second data transmission path 35 and sends the display data to the downstream side display unit 9, and displays the display data acquired from the first data transmission path 33 or the second data transmission path. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a large-sized video display device configured by arranging a plurality of display units, and more particularly to improving reliability against failure of a display unit or the like.

  2. Description of the Related Art Conventionally, a large-sized video display device having a large screen of several meters or more has been used. This type of large-sized video display device is installed, for example, on a stadium, an event venue, or a wall of a building.

  A large video display device is configured by arranging a large number of display units in a matrix. Each display unit is, for example, a square display device having a side of several tens of centimeters, and a large number of light emitting elements are arranged in each display unit. The light emitting element is typically an LED.

  In a large video display device, it is necessary to supply display data to a large number of display units. Data supply formats include a bus method and a cascade method. In the bus system, each display unit stores address data, and the display data specified by the address data is acquired from the bus line. In this case, even if one display unit fails, the other display units can continue to acquire display data from the bus line. Therefore, it is possible to avoid a major problem that a plurality of display units cannot be displayed simultaneously (for example, Patent Document 1).

  Conventionally, display data is generally supplied by the bus system described above. However, recently, there is a demand for a transmission technology that is faster and cheaper in order to increase the gradation of a large-sized video display device and to enable multistage connection. Against this background, LVDS (Low Voltage Differential Signaling) or the like is generally adopted in large-sized video display devices. In this case, the display units are sequentially connected by cables in a cascade manner.

  In the case of the cascade method, display data is sequentially transferred from the display unit to the display unit. For this reason, if one display unit fails and the display unit connected behind becomes incapable of display, a plurality of display units cannot be displayed at the same time, resulting in a large problem. In order to avoid such a situation, the conventional large-sized video display device has a configuration in which each display unit is divided into a display unit and a transmission unit as described below.

  15 and 16 show a configuration example of a cascade-type large-sized video display device. In FIG. 15, the large video display unit 101 is composed of a large number of display units 103 arranged in a matrix. The large number of display units 103 are divided into a plurality of display unit groups 105, and the display units 103 in each display unit group 105 are sequentially connected in cascade by a cable 104. In FIG. 15, the cable 104 is represented by a hexagonal mark. The leading display unit 103 is connected to the signal distributor 107, and display data is supplied from the signal distributor 107 to the display unit group 105.

  FIG. 16 shows the configuration of one display unit 103. Each display unit 103 includes a display unit 111 and a transmission unit 113 that can be attached to and detached from the display unit 111. The transmission unit 113 is connected to the transmission unit 113 of the adjacent display unit 103 by the cable 104.

  The display unit 111 includes a light emitting unit 115, a data display control unit 117, and a display device power source 119. The light emitting unit 115 is a panel in which a large number of light emitting elements are arranged. The data display control unit 117 controls the light emitting unit 115 according to the display data received from the transmission unit 113.

  The transmission unit 113 includes a data acquisition unit 121, a waveform correction circuit 123, an address conversion circuit 125, and a voltage drop circuit 127. The data acquisition unit 121 acquires display data and address data from the previous display unit 103. The display data is a collection of display data for a plurality of display units. Here, the display data for each display unit is referred to as unit display data. The address data is data indicating the address (position) of the unit display data in the display data. Address data may be stored in the display unit 103 in advance. The data acquisition unit 121 acquires unit display data based on the address data and passes it to the display unit 111. The waveform correction circuit 123 is provided for the above-described LVDS, and corrects the waveform and clock disturbance. The address conversion circuit 125 converts address data for the next display unit 103. By this conversion, the address data becomes a signal for specifying the position of the unit display data to be acquired by the next display unit 103. The voltage drop circuit 127 converts the voltage to a value suitable for an LVDS compatible transmission circuit.

  With the above configuration, display data is sequentially transmitted from the transmission unit 113 of one display unit 103 to the transmission unit 113 of the next display unit 103. In each display unit 103, the transmission unit 113 acquires display data and passes it to the display unit 111, and the display unit 111 causes the light emitting unit 115 to emit light according to the display data.

  In addition, the data display control unit 117 of the display unit 111 returns the state data of the display unit 103 to the data acquisition unit 121. The status data is data of an abnormality detection result in the unit. The status data is sent through the reverse path to the display data, returned to the signal distributor 107, and provided to the status monitoring device.

In such a large video display device, it is assumed that the display unit 111 of one display unit 103 has failed. In this case, the transmission unit 113 can transmit display data as usual. Therefore, the remaining display units 103 connected in the subsequent stage can continue the display. Further, when repairing the failed display unit 103, the display unit 111 is separated from the transmission unit 113 and replaced. At this time, it is possible to perform hot replacement in which replacement work is performed without turning off the power of the other display units 103. Thus, in the conventional large-sized video display device, the display unit 111 and the transmission unit 113 are configured to be detachable, thereby minimizing the influence of the failure of the display unit 103.
JP 2002-244633 A (pages 4-7, FIG. 2, etc.)

  However, the conventional large-sized video display device has a problem that the reliability of the failure of the transmission unit and the cable is low even if the failure of the display unit of the display unit can be suitably dealt with. For example, a circuit failure such as a waveform correction circuit for LVDS may occur in the transmission unit, or a cable may be disconnected. When such a failure occurs, a plurality of display units connected to the downstream side of the failure location cannot be displayed simultaneously. In order to further improve the reliability of a large-sized video display device, it is desired to improve the reliability against a failure of a transmission unit or a cable.

  The present invention has been made in order to solve the conventional problems, and an object of the present invention is to provide a large-sized video display device capable of improving reliability against a failure of a transmission unit of a display unit or a cable between units.

  The large image display device of the present invention includes a large image display unit configured by arranging a plurality of display units, and the plurality of display units form one or more display unit groups. Display data is supplied to a plurality of display units by inter-unit data transmission. In this large-sized video display device, each display unit group includes a first data transmission path for sequentially visiting a plurality of display units constituting the display unit group, and the plurality of display units in a direction opposite to the first data transmission path. And the second data transmission path is set, and each display unit acquires display data from the upstream display unit along the first data transmission path and sends the display data to the downstream display unit. First transmission means, second transmission means for obtaining display data from the upstream display unit along the second data transmission path and sending the display data to the downstream display unit, and the first transmission means or the Display control means for displaying the display data acquired by the second transmission means on the display unit.

  With this configuration, display data is transmitted along the first data transmission path and the second data transmission path in opposite directions. Such duplexing in the reverse direction can improve the reliability against the failure of the transmission unit of the display unit and the cable between the units.

  Further, in the large-sized video display device of the present invention, the first transmission means is a display unit in which the first transmission means is provided on display data acquired from an upstream display unit along the first data transmission path. Is sent to the downstream display unit, and the second transmission means adds the display data acquired from the upstream display unit along the second data transmission path to the second transmission means. The status data of the provided display unit is added and sent to the downstream display unit. With this configuration, a transmission path for returning status data is shared with a transmission path for sending display data, and the number of transmission paths can be reduced.

  In the large-sized video display device according to the present invention, the display data includes a plurality of unit display data to be displayed by a plurality of display units of the display unit group, and the first transmission unit and the second transmission unit. Adds the state data to the display data by replacing the unit display data of the corresponding display unit in the display data with the state data. With this configuration, transmission paths for display data and status data can be shared without increasing the amount of information to be transmitted.

  Moreover, in the large-sized video display device of the present invention, each display unit checks whether there is an abnormality in each of the plurality of display data acquired from the first data transmission path and the second data transmission path and is normal. Data selection means for selecting display data is provided. With this configuration, each display unit performs display according to normal display data acquired from the first data transmission path or the second data transmission path. Therefore, even if transmission of both systems (the first data transmission path and the second data transmission path) becomes impossible with one display unit, the images of all the remaining display units in the group are preferably displayed without being disturbed. Will continue. Moreover, even if transmission of both systems becomes impossible with one cable, the images of all the display units are preferably continuously displayed without being disturbed. In addition, active replacement of the failed part is possible. In this way, it is possible to reduce the influence of the failure of the transmission unit and the cable.

  The large-sized video display device of the present invention includes a first signal distributor that supplies the display data to a display unit that is located on the most upstream side of the first data transmission path in the display unit group, and the first signal distributor. And a second signal distributor for supplying the display data to a display unit located on the most upstream side of the second data transmission path. With this configuration, the signal distributor is also duplicated, and the reliability can be improved. Conventionally, when the signal distributor is duplicated, a switching device for switching between the two signal distributors is required. In the present invention, since data is transmitted from the two signal distributors to the two systems, respectively, a conventional switching device is not required. Thus, a duplex system including a signal distributor can be provided with a simple configuration, and the reliability can be improved.

  The large-sized video display device according to the present invention includes a first control device that supplies the display data to the first signal distributor, and the second signal distributor that is provided separately from the first control device. And a second control device for supplying the display data. With this configuration, the control device is also duplicated, and the reliability can be improved.

  In the large-sized video display device of the present invention, the first signal distributor and the second signal distributor can transmit and receive the display data, and the first signal distributor and the second signal distributor. The device transmits and receives the display data so as to provide the display unit group with the display data from the same control device. With this configuration, it is possible to prevent deterioration in image quality due to display of display data from different control devices depending on the display unit.

  In another aspect of the present invention, a large-sized video display device includes a large-sized video display unit configured by arranging a plurality of display units, and the plurality of the plurality of large-sized video display devices by data transmission between units along a predetermined data transmission path. Display data is supplied to the display unit. In this large-sized video display device, each display unit acquires the display data from the upstream display unit along the data transmission path and sends the display data to the downstream display unit, and the transmission unit acquires the display data. Display control means for causing the display unit to display the displayed display data, and the transmission means includes status data adding means for adding the status data of the display unit to the display data. With this configuration, a transmission path for returning status data is shared with a transmission path for sending display data, and the number of transmission paths can be reduced.

  Further, in the large-sized video display device of the present invention, the display data is composed of a plurality of unit display data to be displayed on each of the plurality of display units of the display unit group, and the state data adding means includes the display data in the display data. The status data is added to the display data by replacing the unit display data of the corresponding display unit with the status data. With this configuration, transmission paths for display data and status data can be shared without increasing the amount of information to be transmitted.

  The large image display method of the present invention is applied to a large image display device configured by arranging a plurality of display units. One or more display unit groups are created by the plurality of display units, and each display unit group is displayed. The display data is supplied by inter-unit data transmission to display a large image on the large image display device. In this large-sized video display method, the display data is supplied along a first data transmission path that sequentially goes around a plurality of display units constituting the display unit group, and the plurality of video data is displayed in a direction opposite to the first data transmission path. The display data is supplied along a second data transmission path that goes around the display unit. This aspect also provides the above-described advantages of the present invention.

  According to the present invention, by providing a duplex configuration having a first data transmission path and a second data transmission path that are opposite to each other, it is possible to improve the reliability of a transmission unit of a display unit and a cable failure between the units. A large-sized video display device having an effect can be provided.

  Hereinafter, a large-sized video display device according to an embodiment of the present invention will be described with reference to the drawings.

  A large-sized video display device according to a first embodiment of the present invention is shown in FIGS. FIG. 3 shows the overall configuration of the large video display device, FIG. 1 shows a part of a large screen provided in the large video display device, and FIG. 2 shows one display unit in the large screen. ing. First, the overall configuration will be described with reference to FIG.

  In FIG. 3, the large video display device 1 includes a large video display unit (large screen) 3, a signal distributor 5, and a control device 7. The large video display unit 3 is composed of a number of display units 9 arranged in a matrix in the vertical and horizontal directions. The control device 7 processes the input video signal, converts it into display data for the large video display unit 3, and outputs it to the signal distributor 5. The signal distributor 5 distributes the display data input from the control device 7 to the display unit 9 of the large video display unit 3. Although one signal distributor 5 is shown in the figure, a plurality of signal distributors 5 may actually be provided.

  The control device 7 includes an analog / digital (hereinafter referred to as A / D) conversion unit 11 that converts a video signal into a digital signal, a video adjustment unit 13 that performs video adjustment of the video signal converted into the digital signal, and a test signal. A test signal generation unit 15 for generating the control information, a control information control unit 17 for generating and displaying control information, and multiplexing by adding a control signal to the display data and displaying the display data obtained by multiplexing the control signal A signal multiplexing / data transmission unit 19 for output, a monitoring unit 21 for monitoring status data such as power supply abnormality and cooling fan abnormality, and a central processing unit (hereinafter referred to as CPU) connected to each unit via a bus and controlling each unit 23).

  A video signal is input to the A / D converter 11. The input video signal is converted into a digital signal and output to the video adjustment unit 13. The video adjustment unit 13 performs video adjustment processing on the input video signal. This video adjustment includes changing the dot size for displaying the video on the large video display unit 3 and correcting the blurring of the outline of the video signal. The test signal generation unit 15 generates a test pattern and outputs the test signal to the signal multiplexing / data transmission unit 19. The control information control unit 17 controls display on the large video display unit 3 based on the control of the CPU 23. The control information control unit 17 outputs information for control to the signal multiplexing / data transmission unit 19.

  The signal multiplexing / data transmission unit 19 generates a digital video to be displayed on the large video display unit 3. The signal multiplexing / data transmission unit 19 performs scan conversion of the generated digital video signal and outputs the converted data to the signal distributor 5. Screen status data is input from the large video display unit 3 to the monitoring unit 21 via the signal distributor 5. The monitoring unit 21 monitors a power supply abnormality, an abnormality of a cooling fan attached to the display unit 9, and the like.

  The signal distributor 5 converts the display data output from the signal multiplexing / data transmission unit 19 into data for each display unit group of the large video display unit 3 and outputs the data to the large video display unit 3.

  Next, referring to FIG. 1, the large number of display units 9 of the large video display unit 3 are divided into a plurality of display unit groups 31. In the example of the figure, one display unit group 31 is composed of two adjacent display units. Here, in order to distinguish the display units in the group, reference numerals 9a to 9j are given to the display units. These display units 9 a to 9 j are connected in cascade with a cable 10, and the display units 9 a and 9 j at both ends are connected to two different ports of the signal distributor 5. As shown, the cable 10 is shown with hexagonal marks. The display data is supplied from the signal distributor 5 to the display units 9a to 9j by inter-unit data transmission via the cable 10.

  As a feature of the present embodiment, a first data transmission path 33 (first system) and a second data transmission path 35 (second system) are set in each display unit group 31. The first data transmission path 33 and the second data transmission path 35 are set so as to go around the display units 9a to 9j constituting the display unit group 31 sequentially. However, the directions of the first data transmission path 33 and the second data transmission path 35 are opposite. Specifically, the first data transmission path 33 is set in the order of the display units 9a, 9b, 9c, 9d, 9e, 9f, 9g, 9h, 9i, and 9j. On the other hand, the second data transmission path 35 is set in the order of the display units 9j, 9i, 9h, 9g, 9f, 9e, 9d, 9c, 9b, 9a. The large-sized video display device 1 according to the present embodiment uses the first data transmission path 33 and the second data transmission path 35 to perform double transmission of display data in opposite directions.

  In the following description, when the first data transmission path 33 and the second data transmission path 35 are described together, they are simply referred to as data transmission paths.

  FIG. 1 shows a dual transmission path of one display unit group 31, but the other display unit groups have the same configuration.

  FIG. 2 shows a display unit 9 configured to be compatible with the above-described duplex transmission. The display unit 9 includes a display unit 41 and a transmission unit 43 that can be attached to and detached from the display unit 41.

  The display unit 41 includes a light emitting unit 51, a data display control unit 53, and a display device power supply 55. The light emitting unit 51 is a panel in which a large number of light emitting elements are arranged, and the light emitting elements are LEDs. The data display control unit 53 controls the light emitting unit 51 according to the display data received from the transmission unit 43.

  The transmission unit 43 includes a first transmission unit 61a that processes display data sent along the first data transmission path, a second transmission unit 61b that processes display data sent along the second data transmission path, and these. In order to supply power to the configuration, a voltage drop circuit 63 corresponding to LVDS is provided.

  The first transmission unit 61 a acquires display data and address data from the upstream display unit 9 along the first data transmission path 33, processes the acquired data, and outputs the processed data to the downstream display unit 9. . The first transmission unit 61a includes a first data acquisition unit 65a, a first waveform correction circuit 67a, and a first address conversion circuit 69a.

  Here, the details of the display data and the address data in the present embodiment will be described with reference to FIG. FIG. 4 shows display data and address data, and processing in the display unit for these data.

  As shown in FIG. 4, the transmitted display data is a collection of a plurality of display data to be displayed on each of the plurality of display units 9 in the display unit group 31. Here, the display data for each display unit is referred to as unit display data.

  The address data is data for specifying an address (position) of unit display data to be acquired by each display unit 9. The address data is also a collection of a plurality of address data respectively corresponding to the plurality of display units 9. Here, the address data of each display unit is referred to as unit address data.

  The display data and address data are processed as follows in the first transmission unit 61a. As shown in the upper part of FIG. 4, the first data acquisition unit 65 a acquires unit address data in which the control flag is ON in the address data. Then, the first data acquisition unit 65a acquires unit display data specified by the unit address data from the display data. The acquired unit display data is supplied to the data display control unit 53 of the display unit 41 and displayed on the light emitting unit 51.

  The first waveform correction circuit 67a is provided for LVDS, and corrects the waveform and clock disturbance.

  The first address conversion circuit 69 a performs an address data conversion process for the next display unit 9. As shown in the lower part of FIG. 4, in the address data conversion process, the position of the unit address data of the control flag ON is shifted by one. The converted address data is sent to the next display unit 9. Therefore, the next display unit 9 acquires and displays the unit display data at the address shifted by one. In this way, each display unit 9 can acquire different unit display data sequentially.

  In addition, the data display control unit 53 of the display unit 41 performs an abnormality detection process, and supplies state data as a detection process result to the first data acquisition unit 65a. The status data is transmitted through the reverse route to the display data and the address data. As a result, the status data of all the display units 9 in the group is finally sent to the signal distributor 5.

  On the other hand, the second transmission unit 61b acquires the display data and the address data from the upstream display unit 9 along the second data transmission path 35, processes the acquired data, and sends it to the downstream display unit 9. It is the structure which outputs. The second transmission unit 61b includes a second data acquisition unit 65b, a second waveform correction circuit 67b, and a second address conversion circuit 69b. The second data acquisition unit 65b, the second waveform correction circuit 67b, and the second address conversion circuit 69b correspond to the first data acquisition unit 65a, the first waveform correction circuit 67a, and the first address conversion circuit 69a, respectively. However, in the first transmission unit 61a and the second transmission unit 61b, the data acquisition source and the output destination are reversed. Except for this point, each part structure of the 1st transmission part 61a and the 2nd transmission part 61b is the same.

  As already described, two adjacent display units 9 are connected by a cable 10 for data transmission. In the present embodiment, the transmission units 43 are connected by a single cable 10. The single cable 10 incorporates the transmission paths of the first data transmission path 33 and the second data transmission path 35 described above. More specifically, one cable 10 transmits display data, address data, and status data of the first data transmission path 33, and display data, address data, and status data of the second data transmission path 35. Display data and address data are transmitted on the same transmission path.

  The configuration of the large video display device 1 according to the present embodiment has been described above. Next, the operation of the large video display device 1 will be described.

  The control device 7 processes the input video signal and converts it into display data suitable for the large video display unit 3. The generated display data is supplied to the large video display unit 3 via the signal distributor 5. Display data is supplied to a plurality of display units 9 in each display unit group 31. The display data is supplied through the first data transmission path 33 and the second data transmission path 35 which are opposite to each other. Each display unit 9 acquires display data from both of the two data transmission paths 33 and 35.

  FIG. 1 shows the operation during normal operation, that is, when no failure has occurred. During normal operation, each display unit 9 is controlled to output display data obtained from either the first data transmission path 33 or the second data transmission path 35. Here, it is assumed that the first data transmission path 33 is normally used. The control device 7 adds an instruction for outputting the display data of the first data transmission path 33 to the display data. In accordance with this instruction, the data display control unit 53 of each display unit 9 causes the light emitting unit 51 to display the display data supplied from the first data acquisition unit 65a of the first transmission unit 61a. As each light emitting unit 51 displays the display data, a large image is displayed as a whole.

  Next, FIG. 5 shows an operation when a failure occurs. In FIG. 5, transmission from the display unit 9c to the display unit 9d is disabled on the first data transmission path 33. This transmission failure is caused by a failure of the first transmission unit 61a of the display unit 9d. Further, this transmission failure occurs due to the disconnection of the first data transmission path 33 in the cable 10 between the display units 9c and 9d.

  The control device 7 acquires status data as return data from the first data transmission path 33 and the second data transmission path 35 via the signal distributor 5. When the transmission failure shown in FIG. 5 occurs, normal state data cannot be obtained from the first data transmission path 33, and an abnormality in the first data transmission path 33 is detected. Therefore, the control device 7 sends a switching instruction to the corresponding display unit group 31. This switching instruction is an instruction to output display data acquired from the second data transmission path 35. Such an instruction is added to the display data and transmitted. Then, according to this instruction, the data display control unit 53 of each display unit 9 causes the light emitting unit 51 to display the display data supplied from the second data acquisition unit 65b of the second transmission unit 61b.

  In this way, the control device 7 determines in which transmission system an abnormality has occurred, and controls the display unit 9 to continue display using the normal transmission system. Each light emitting unit 51 can continuously display the display data, and a large image can be continuously displayed as a whole.

  The large image display apparatus 1 according to the first embodiment of the present invention has been described above. According to the present embodiment, the first data transmission path 33 and the second data transmission path 35 that are opposite to each other are set in each display unit group 31. Each display unit 9 includes a first transmission unit 61 a corresponding to the first data transmission path 33 and a second transmission unit 61 b corresponding to the second data transmission path 35. Such duplexing can improve the reliability against failure of the display unit and the cable.

  Further, in the present embodiment, the above-described duplex transmission path is accommodated in one inter-unit connection cable. In this way, duplex transmission is realized by a configuration in which the units are connected by a single cable, so that the system can be made inexpensive and simple.

  In this embodiment, the signal distributor 5 and the control device 7 are separated from each other. However, the control device 7 may include the signal distributor 5, and in this case, the control device 7. And the signal distributor 5 separated from each other may be omitted.

  Here, a modification of the first embodiment will be described. In this example, the control when a failure occurs is modified.

  In the above-described embodiment, the control device 7 controls all the display units 9 of one display unit group 31 to display the display data of the same transmission path. That is, all the display units 9 in the group display the display data of the first data transmission path 33, or all the display units 9 display the display data of the second data transmission path 35. However, in this modification, the control device 7 changes which transmission path display data is displayed depending on the display unit 9. This control is advantageous in the following cases.

  For example, in one display unit 9, it is assumed that the transmission unit 43 becomes unable to transmit display data through both the first data transmission path 33 and the second data transmission path 35. In such a case, the display unit 9 that has not failed displays the display data acquired from either the first data transmission path 33 or the second data transmission path 35 under the control of the control device 7. That is, the display unit 9 upstream of the failure location along the first data transmission path 33 displays the display data of the first data transmission path 33. Similarly, the display unit 9 upstream of the failure location along the second data transmission path 35 displays the display data of the second data transmission path 35.

  As a specific example, it is assumed that the display unit 9d in FIG. 1 cannot transmit display data of both data transmission paths. In this case, the display units 9a to 9c display the display data from the first data transmission path 33, and the display units 9e to 9j display the display data from the second data transmission path 35. As in the case of a conventional display unit failure, it is possible to display the entire area except the failed unit.

  Thus, the output display data of each display unit is appropriately controlled according to the failure location. Then, the display units 9 on both sides across the failure location can display an image using display data of different data transmission paths, and the influence of the failure can be suppressed small.

  Next, a large video display apparatus according to the second embodiment of the present invention will be described. Hereinafter, description of matters common to the first embodiment will be omitted, and differences from the first embodiment will be mainly described. In the first embodiment described above, the status data is transmitted in the opposite direction to the display data in each of the first data transmission path and the second data transmission path. On the other hand, in the second embodiment, the status data is added to the display data, transmitted in the same direction as the display data, and transmitted from the last display unit to the signal distributor.

  FIG. 6 shows a display unit 71 provided in the large-sized video display device of the present embodiment. As the overall configuration of the large-sized video display device, as in the first embodiment, a plurality of display units 71 of a display unit group are sequentially connected by a cable 10 in a cascade manner, and the display units 71 at both ends are connected. It is connected to a different port of the signal distributor 5.

  In FIG. 6, the first data acquisition unit 73a acquires state data from the data display control unit 53 and adds the state data to the display data. The status data is output along with the display data and the address data to the next display unit 71 on the downstream side along the first data transmission path 33.

  Since FIG. 6 focuses on one display unit 71, input data is display data and address data, and output data is these data and status data. Actually, each display unit 71 adds state data, and the state data increases. When the display data reaches the last display unit 71 of the first data transmission path 33, the display data is in a state to which the state data of all the display units 1 in the group is added. Return to the distributor 5. The signal distributor 5 receives data including the status data of all the display units 9 in the group, whereby each display unit 71 is monitored.

  Similarly to the first data acquisition unit 73a, the second data acquisition unit 73b also acquires state data from the data display control unit 53 and adds the state data to the display data. The second data acquisition unit 73b and the first data acquisition unit 73a are the same except that the direction of the data transmission path is reversed.

  FIG. 7 shows state data addition processing in the present embodiment. In the present embodiment, in each of the first data acquisition unit 73a and the second data acquisition unit 73b, the unit display data in the display data is replaced with the state data, and thereby the state data is added to the display data.

  More specifically, as shown in FIG. 7, the display data is composed of a plurality of unit display data to be displayed on each of the plurality of display units 71 as already described. Each display unit 71 acquires unit display data specified by the address data of the control flag ON. The acquired unit display data becomes unnecessary. Therefore, the unit display data is replaced with status data.

  In the display unit 71, an address data conversion process is further performed. In the address data conversion process, as described above, the position of the control flag ON is shifted. Data subjected to these processes is output to the next display unit 71.

  The large image display apparatus according to the second embodiment of the present invention has been described above. According to the present embodiment, each display unit adds the display unit status data to the display data acquired from the upstream display unit along the data transmission path, and sends it to the downstream display unit. In the above example, the data acquisition unit of the display unit functions as state data adding means. Thereby, the transmission path for returning the status data is shared with the transmission path for sending the display data, and the number of transmission paths can be reduced.

  Further, according to the present embodiment, each display unit adds the status data to the display data by replacing the unit display data of the corresponding display unit in the display data with the status data. As a result, the transmission path for display data and status data can be shared without increasing the amount of information to be transmitted.

  Next, a large video display apparatus according to the third embodiment of the present invention will be described. Hereinafter, description of matters common to the first embodiment will be omitted, and differences from the first embodiment will be mainly described. In the third embodiment, each display unit includes data selection means for checking normality of each of a plurality of display data acquired from two data transmission paths and selecting normal display data. .

  FIG. 8 shows a display unit 81 provided in the large-sized video display device of the present embodiment. As shown in the figure, in the present embodiment, the display unit and the transmission unit are integrated, and both are not detachable. The voltage drop circuit for the transmission unit is abolished, and the entire display unit 81 operates with power supplied from the display device power supply 55.

  As shown in FIG. 8, the display unit 81 of the present embodiment includes a first data acquisition unit 83a, a second data acquisition unit 83b, a waveform correction circuit 85, and a position information conversion circuit as a configuration related to transmission of display data. 87 and a data selection processing unit 89 are provided.

  The first data acquisition unit 83a and the second data acquisition unit 83b acquire display data of the first data transmission path 33 and the second data transmission path 35, as in the first embodiment. The waveform correction circuit 85 corresponds to a configuration in which the first waveform correction circuit 67a and the second waveform correction circuit 67b in the first embodiment are integrated. The address conversion circuit 87 corresponds to a configuration in which the first address conversion circuit 69a and the second address conversion circuit 69b in the first embodiment are integrated. The first data acquisition unit 83a, the waveform correction circuit 85, the position information conversion circuit 87, and the data selection processing unit 89 correspond to the first transmission unit that processes the display data of the first data transmission path 33, and the second data The acquisition unit 83b, the waveform correction circuit 85, the position information conversion circuit 87, and the data selection processing unit 89 correspond to a second transmission unit that processes display data of the second data transmission path 35.

  The data selection processing unit 89 is located after the first data acquisition unit 83a and the second data acquisition unit 83b. The data selection processing unit 89 corresponds to the data selection means of the present invention, and checks whether there is an abnormality in each of the two display data acquired by the first data acquisition unit 83a and the second data acquisition unit 83b. Select the display data. The selected normal display data is supplied to the data display control unit 53 and displayed on the light emitting unit 51.

  As the display data check process, for example, the presence or absence of a synchronization signal is determined. Also, the checksum of the signal may be confirmed. Also, the display data of the two data transmission paths may be compared. These processes may be combined appropriately.

  The specific operation of the data selection processing unit 89 is as follows, for example. The data selection processing unit 89 is configured to select display data of one of the first data transmission path 33 and the second data transmission path 35 in normal times. Here, it is assumed that display data of the first data transmission path 33 is preferentially selected. When the display data abnormality of the first data transmission path 33 is confirmed, the data selection processing unit 89 confirms whether the display data of the second data transmission path 35 is abnormal or not. Select the display data.

  Further, in this embodiment, the state data from the data display control unit 53 is acquired by the data selection processing unit 89 and added to the display data of both the first data transmission path 33 and the second data transmission path 35. .

  Next, the operation of the large video display apparatus according to the present embodiment will be described with reference to FIG. FIG. 9 shows two display unit groups 31 a and 31 b in the large video display unit 3. In the display unit group 31a, no failure of the display unit 81 has occurred. In this case, each display unit 81 acquires normal display data from both the first data transmission path 33 and the second data transmission path 35, and selects and outputs one of the display data. All the display units 81 display images normally.

  On the other hand, in the display unit group 31b, the transmission unit 43 of one display unit 81d is out of order, and the display unit 81 cannot transmit in both the first data transmission path 33 and the second data transmission path 35. . At this time, the display units 81 a to 81 c on the upstream side of the first data transmission path 33 with respect to the failure location receive normal display data from the first data transmission path 33, but normal display from the second data transmission path 35. Cannot get data. In this case, display data of the first data transmission path 33 is selected and displayed. The display units 81 e to 81 j on the upstream side of the second data transmission path 35 receive normal display data from the second data transmission path 35, but cannot acquire normal display data from the first data transmission path 33. Therefore, the display data of the second data transmission path 35 is selected and displayed.

  Thus, in this embodiment, even if one display unit fails, all the display units that do not fail can continue displaying. It is not necessary to determine the occurrence of abnormality and display control for each display unit by the control device 7, and each display unit can perform determination and switching without receiving such control from the control device 7. Therefore, the large-sized image display unit can continue the display without any disturbance of the image of the display unit that has not failed. Further, when replacing the failed display unit 81d, it is not necessary to turn off the power supply of the entire screen, and active replacement is possible. Therefore, the influence of failure can be minimized.

  In the above example, the failure of the display unit 81 has been described. As another example, it is assumed that a failure such as a cut occurs in the cable 10 and the transmission of both transmission paths becomes impossible. The operation in this case is the same as in the case of a unit failure. That is, the display unit 81 upstream of the cut position along the first data transmission path 33 continues to display using the display data of the first data transmission path 33. Similarly, the display unit 81 upstream of the cut position along the second data transmission path 35 continues the display using the display data of the second data transmission path 35. Therefore, in the case of a cable failure, all the display units 81 can continue the display. Again, since each display unit performs the determination process, the display can be continued without any disturbance of the video.

  The large image display apparatus according to the third embodiment of the present invention has been described above. According to the present embodiment, each display unit 81 selects normal display data by checking whether there is an abnormality in each of the plurality of display data acquired from the first data transmission path and the second data transmission path. . Each display unit performs display according to normal display data acquired from the first data transmission path or the second data transmission path. When a failure occurs, the display unit 81 on the upstream side of the failure location along the first data transmission path 33 continues display using the display data of the first data transmission path 33. Similarly, the display unit 81 upstream of the failure location along the second data transmission path 35 continues to display using the display data of the second data transmission path 35. The output display data of the display unit is appropriately switched according to the failure location, and the display units 81 on both sides across the failure location can continue to display using the display data of different data transmission paths.

  Therefore, even if the transmission of both systems (the first data transmission path 33 and the second data transmission path 35) is disabled by one display unit 81, all the remaining display units 81 in the group have a video disturbance. The display can be suitably continued without accompanying. Moreover, even if transmission of both systems becomes impossible with the one cable 10, all the display units 81 can continue displaying suitably without accompanying disorder of an image | video. In addition, active replacement of the failed part is possible. In this way, it is possible to reduce the influence of the failure of the transmission unit and the cable.

  In this regard, also in the large-sized video display device according to the first embodiment, as described above, if the control device 7 individually controls each display unit, all display units that are not malfunctioning display normal display data. Can be acquired from the first data transmission path 33 or the second data transmission path 35. However, the third embodiment is advantageous compared to such a configuration. As a reason for this, in the third embodiment, each display unit 81 is provided with data selection means, and each display unit 81 determines the presence or absence of data abnormality and selects output data. It is possible to switch quickly and automatically, and to avoid video disturbance.

  Further, in the present embodiment, even if the failed display unit 81 and the cable 10 of the display unit 81 connected to the front and rear thereof are removed, the display of the front and rear display units 81 is continued. Therefore, it is not necessary to separate the display unit and the transmission unit as in the prior art at the time of active replacement, and the display unit and the transmission unit are integrated there. Furthermore, since it is not necessary for the display unit and the transmission unit to operate independently, the power supplied from the signal distributor 5 via the connection cable becomes unnecessary, and the voltage drop circuit is also eliminated. Thus, the system can be simplified.

  Next, a large video display apparatus according to a fourth embodiment of the present invention will be described with reference to FIG. Hereinafter, description of matters common to the above-described embodiment will be omitted, and differences from the above-described embodiment will be mainly described.

  In the above-described embodiment, the signal transmission port of the first data transmission path 33 (signal reception port of the second data transmission path 35) and the signal transmission port of the second data transmission path 35 (signals of the first data transmission path 33) Are connected to one signal distributor 5.

  On the other hand, in the fourth embodiment, as shown in FIG. 10, the signal transmission port of the first data transmission path 33 (the signal reception port of the second data transmission path 35) and the second data transmission path 35 signal transmission ports (signal reception ports of the first data transmission path 33) are connected to different signal distributors, that is, the first signal distributor 5a and the second signal distributor 5b. Thus, in the fourth embodiment, the signal distributor is also duplicated. The two signal distributors transmit exactly the same display data.

  FIG. 10 shows a large video display device in a normal state. When normal, display data is supplied from the first signal distributor 5a to each display unit 9 via the first data transmission path 33, and at the same time, the same display data is transmitted from the second signal distributor 5b to the second data transmission path 35. Is supplied to each display unit 9 via the. Each display unit 9 outputs display data supplied from one of the first signal distributor 5a and the second signal distributor 5b. Here, it is assumed that display data is output from the first signal distributor 5a.

  FIG. 11 shows the operation when the first signal distributor 5a fails. When the first signal distributor 5a fails, the first data transmission path 33 does not transmit display data. However, the display data from the second signal distributor 5 b is supplied to each display unit 9 via the second data transmission path 35. Therefore, each display unit 9 performs switching so as to output display data from the second signal distributor 5b. Thereby, even if the failure of the first signal distributor 5a occurs, normal display can be continued.

  The large video display apparatus according to the fourth embodiment of the present invention has been described above. According to the present embodiment, the first signal distributor 5a is connected to the display unit 9 located on the most upstream side of the first data transmission path 33, and the second signal provided separately from the first signal distributor 5a. The display unit 9 located on the most upstream side of the second data transmission path 35 is connected to the distributor 5b. Thereby, the signal distributor is also duplicated, and the reliability can be further improved. Conventionally, when the signal distributor is duplicated, a switching device for switching between the two signal distributors is further required. In the present invention, since data is transmitted from the two signal distributors to the two systems, respectively, a conventional switching device is not required. Thus, a duplex system including a signal distributor can be provided with a simple configuration, and the reliability can be improved.

  Next, with reference to FIG. 12, a large image display apparatus according to a fifth embodiment of the present invention will be described. Hereinafter, description of matters common to the above-described embodiment will be omitted, and differences from the above-described embodiment will be mainly described.

  In the above-described fourth embodiment, the signal distributor is duplicated. In contrast, in the fifth embodiment, the control device is also duplicated. That is, in the fifth embodiment, as shown in FIG. 12, the first control device 7a is connected to the first signal distributor 5a, and the display data is transferred from the first control device 7a to the first signal distributor 5a. Supplied. A second control device 7b provided separately from the first control device 7a is connected to the second signal distributor 5b, and display data is supplied from the second control device 7b to the second signal distributor 5b.

  In the present embodiment, the first signal distributor 5a and the second signal distributor 5b are configured to transmit and receive display data. When a failure occurs, the first signal distributor 5a and the second signal distributor 5b provide display data from the same control device (the first control device 7a or the second control device 7b) to the display unit group 31. Thus, display data is transmitted and received.

  FIG. 12 shows a large video display device in a normal state. When normal, display data is supplied from the first control device 7a to each display unit 9 via the first signal distributor 5a and the first data transmission path 33, and at the same time, the display data is sent from the second control device 7b to the second data. The signal is supplied to each display unit 9 via the signal distributor 5 b and the second data transmission path 35. Each display unit 9 outputs display data supplied from one of the first control device 7a and the second control device 7b. Here, it is assumed that display data is output from the first control device 7a.

  FIG. 13 shows the operation when the first control device 7a fails. When the first control device 7a fails, the first signal distributor 5a determines an abnormality from the data from the first control device 7a. In this case, the first signal distributor 5a displays the display data from the second signal distributor 5b. , And subsequently, display data is transmitted through the first data transmission path 33. Thereby, even if the failure of the first control device 7a occurs, normal display can be continued.

  In FIG. 14, the transmission unit of the display unit 9d has failed, and the transmission of both transmission paths is disabled by the display unit 9d. In this case, display data is supplied from the first signal distributor 5a to the second signal distributor 5b, and display data is supplied from the second signal distributor 5b to the second data transmission path 35. As a result, the display units 9e to 9j acquire the display data of the first control device 7a via the second data transmission path 35. Further, the display units 9a, 9b, and 9c acquire the display data transmitted from the first control device 7a to the first data transmission path 33 via the first signal distributor 5a, as before the failure. In this way, display data is transmitted and received between the first signal distributor 5a and the second signal distributor 5b so that all the display units except the failure unit 9d receive the display data of the same control device (first control device 7a). The

  Although an example of unit failure has been described here, display data is also transmitted and received between signal distributors so as to supply display data of the same control device in the case of cable failure.

  The large video display apparatus according to the fifth embodiment of the present invention has been described above. According to the present embodiment, the large video display device is provided separately from the first control device 7a for supplying display data to the first signal distributor 5a and the first control device 7a, and is provided in the second signal distributor 5b. And a second control device 7b for supplying display data. Thereby, the control device is also duplicated, and the reliability can be further improved.

  In the present embodiment, the first signal distributor 5a and the second signal distributor 5b can transmit and receive display data, and the first signal distributor 5a and the second signal distributor 5b are supplied from the same control device. Transmit and receive display data to provide display data to the display unit group. As a result, it is possible to prevent deterioration in image quality due to display of display data from different control devices depending on the display unit.

  More specifically, when the control devices are duplicated, different images may be input to the two control devices, or processing contents may be different between the two control devices. In that case, if display data of a control device that differs depending on the display unit is output, the image quality may be deteriorated due to synchronization or a difference in hue. However, in the present embodiment, such a deterioration in image quality can be prevented by linking the two signal distributors.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and it goes without saying that those skilled in the art can modify the above-described embodiments within the scope of the present invention.

  As described above, the large-sized video display device according to the present invention is provided with the duplex configuration for transmitting the display data along the first data transmission path and the second data transmission path which are opposite to each other. And is effective as a large video display device for various facilities such as stadiums and event venues.

The figure which shows the large sized image display apparatus in the 1st Embodiment of this invention The figure which shows one display unit which comprises a large sized image display apparatus. Diagram showing the overall configuration of a large video display device Diagram showing display data and address data Diagram showing the operation of a large video display device when a failure occurs The figure which shows the display unit which comprises the large sized image display apparatus which concerns on 2nd Embodiment. The figure which shows the process which adds status data to display data The figure which shows the display unit which comprises the large sized image display apparatus which concerns on 3rd Embodiment. The figure which shows operation | movement of the large sized image display apparatus which concerns on 3rd Embodiment. The figure which shows the large sized image display apparatus which concerns on 4th Embodiment. The figure which shows the failure occurrence state of the large sized image display apparatus which concerns on 4th Embodiment The figure which shows the large sized image display apparatus which concerns on 5th Embodiment. The figure which shows the failure generation state of the large sized image display apparatus which concerns on 5th Embodiment The figure which shows the failure generation state of the large sized image display apparatus which concerns on 5th Embodiment Diagram showing a conventional large video display device The figure which shows the display unit which comprises the conventional large sized image display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Large video display 3 Large video display part 5 Signal distributor 7 Control apparatus 9 Display unit 31 Display unit group 33 1st data transmission path 35 2nd data transmission path 41 Display part 43 Transmission part 51 Light emission part 53 Data display control part 55 Display device power supply 61a First transmission unit 61b Second transmission unit 63 Voltage drop circuit 65a First data acquisition unit 65b Second data acquisition unit 67a First waveform correction circuit 67b Second waveform correction circuit 69a First address conversion circuit 69b Second Address conversion circuit

Claims (10)

A large video display unit configured by arranging a plurality of display units is provided, and the plurality of display units form one or more display unit groups, and inter-unit data transmission to a plurality of display units of each display unit group In a large video display device that supplies display data by
Each display unit group includes a first data transmission path that sequentially goes around the plurality of display units that constitute the display unit group, and a second data transmission path that goes around the plurality of display units in a direction opposite to the first data transmission path. And are set,
Each display unit includes first transmission means for acquiring display data from the upstream display unit along the first data transmission path and sending the display data to the downstream display unit, and along the second data transmission path. Second transmission means for acquiring display data from the upstream display unit and sending the display data to the downstream display unit, and the display data acquired by the first transmission means or the second transmission means for the display unit. A large-sized video display device comprising display control means for displaying on a screen. The first transmission means adds the status data of the display unit provided with the first transmission means to the display data acquired from the upstream display unit along the first data transmission path. To the display unit,
The second transmission means adds state data of the display unit provided with the second transmission means to the display data acquired from the upstream display unit along the second data transmission path, and 2. The large-sized video display device according to claim 1, wherein the large-size video display device is sent to a display unit. The display data is composed of a plurality of unit display data to be displayed on a plurality of display units of the display unit group,
The first transmission means and the second transmission means add the status data to the display data by replacing the unit display data of the corresponding display unit in the display data with the status data. 2. A large image display device according to 2.   Each display unit includes data selection means for checking normality of each of a plurality of display data acquired from the first data transmission path and the second data transmission path and selecting normal display data. 4. A large-sized video display device according to claim 1, wherein   A first signal distributor for supplying the display data to a display unit located on the most upstream side of the first data transmission path in the display unit group and the second signal distributor are provided separately from the first signal distributor. 5. The large-sized video display device according to claim 1, further comprising a second signal distributor that supplies the display data to a display unit positioned on the most upstream side of the data transmission path.   A first control device that supplies the display data to the first signal distributor, and a second control that is provided separately from the first control device and supplies the display data to the second signal distributor The large-sized video display device according to claim 5, further comprising a device.   The first signal distributor and the second signal distributor can transmit and receive the display data, and the first signal distributor and the second signal distributor can receive the display from the same controller. The large-sized video display device according to claim 6, wherein the display data is transmitted and received so as to provide data to the display unit group. In a large video display device comprising a large video display unit configured by arranging a plurality of display units, and supplying display data to the plurality of display units by inter-unit data transmission along a predetermined data transmission path,
Each display unit has transmission means for acquiring display data from an upstream display unit along the data transmission path and sending the display data to a downstream display unit, and for displaying the display data acquired by the transmission means. A display control means for displaying on the unit, and the transmission means comprises a state data adding means for adding the state data of the display unit to the display data. The display data is composed of a plurality of unit display data to be displayed on a plurality of display units of the display unit group,
9. The large image according to claim 8, wherein the status data adding means adds the status data to the display data by replacing the unit display data of the corresponding display unit in the display data with the status data. Display device. This is applied to a large-sized video display device configured by arranging a plurality of display units. One or more display unit groups are created by the plurality of display units, and the display data is supplied to each display unit group by inter-unit data transmission. A large image display method for displaying a large image on the large image display device,
The display data is supplied along a first data transmission path that sequentially travels through a plurality of display units constituting the display unit group, and second data travels around the plurality of display units in a direction opposite to the first data transmission path. A method of displaying a large image, wherein the display data is supplied along a transmission path.