JP2017181526A - Video display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video display system capable of preventing all video on an image display device from stopping even in a period from detection of abnormality in a display computer to switch of video input to the image display device.SOLUTION: A video display system includes: display computers 11, 12, 13, 14 for drawing part of screens of image display devices 1, 2, 3, 4 operating at normal times; and display computers 21, 22, 23, 24 for drawing the rest of the screens of image display devices 1, 2, 3, 4 operating at normal times. When abnormality in a communication opposite party is detected, normal display computers among the display computers 11, 12, 13, 14 and the display computers 21, 22, 23, 24 draw all of the screens of the corresponding image display devices 1, 2, 3, 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a video display system that displays video on a plurality of image display devices connected to a plurality of computers.

  A display wall system (video display system) that enables display as a single large screen by arranging a plurality of image display devices in a grid pattern has been commercialized. Video display systems are widely used in the field of supervisory control systems. In the video display system, in order to display a video having a resolution higher than the screen size that can be output by one image display device, a display computer is connected to each of the image display devices, and each of the display computers has individual parts. There is a method of displaying a window image across a plurality of image display devices.

  Further, operation continuity is required in the field of supervisory control systems. Therefore, in the video display system used in the surveillance control system, when a plurality of display computers are connected to one image display device and one display computer becomes abnormal, another display for standby is displayed. There is a method of switching to a computer (see, for example, Patent Document 1).

Japanese Patent No. 4675567

  However, in the video display system described in Patent Document 1, after the abnormality of the display computer is detected, another display computer is instructed to start another video display from the abnormal display computer. There is a problem that all the video on the image display device stops until the video is output from the display computer and the video input of the image display device is switched.

  Therefore, the present invention can avoid stopping all the videos of the image display device even after the abnormality of the display computer is detected until the video input of the image display device is switched. An object is to provide a display system.

  The video display system according to the present invention is a video display system that displays video on a multi-screen composed of a plurality of image display devices, and is connected to the corresponding image display device provided for each of the image display devices. And a first display computer that performs a part of drawing of the screen of the image display device corresponding to the normal time, and connected to the corresponding image display device provided for each of the image display devices, and A first display computer connected to the same image display device and the second display, the second display computer performing the remainder of the drawing of the screen of the image display device corresponding to the normal time And the first display computer is connected to be communicable with each other and has a function of detecting an abnormality of the communication partner. And normal display computer of the second display computer performs a whole drawing of the screen of the corresponding image display device.

  According to the present invention, the video display system is provided for each image display device, connected to the corresponding image display device, and performs a part of the screen drawing of the image display device corresponding to the normal time. A display computer and a second display computer that is provided for each image display device and connected to the corresponding image display device, and that performs the remaining drawing of the screen of the image display device corresponding to the normal time, The first display computer and the second display computer connected to the same image display device are connected to each other so as to communicate with each other, and have a function of detecting an abnormality of the communication partner. Of the first display computer and the second display computer, a normal display computer performs all drawing of the screen of the corresponding image display device.

  Therefore, even when an abnormality is detected in one of the first display computer and the second display computer and drawing by the display computer is stopped, drawing by the other display computer is performed. Does not stop. As a result, even after the abnormality of the display computer is detected, until the normal display computer performs all drawing of the screen, that is, until the video input of the image display device is switched, the image display is performed. It can be avoided that all images of the apparatus are stopped.

It is a figure which shows the structural example of the video display system which concerns on embodiment. It is a hardware block diagram of the computer for a display. It is a figure which shows the image | video currently drawn by the 1st computer for display at normal time. It is a figure which shows the image | video currently drawn by the 2nd computer for display at normal time. It is a figure which shows the image | video which the image display apparatus displays normally. It is a figure which shows the image | video which the image display apparatus is displaying when the 2nd display computer fails. It is a flowchart which shows operation | movement of the computer for a display.

<Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a configuration example of a video display system according to an embodiment.

  As shown in FIG. 1, the video display system includes image display devices 1, 2, 3, 4, display computers 11, 12, 13, 14 that are first display computers, and a second display computer. Some display computers 21, 22, 23, and 24 are provided. The video display system further includes a central control unit (not shown). In the video display system shown in FIG. 1, the four image display devices 1, 2, 3, and 4 form a 2 × 2 multi-display (multi-screen), and video is displayed on the multi-screen. The image display devices 1, 2, 3, and 4 provided for the respective image display devices 1, 2, 3, and 4 include display computers 11, 12, 13, and 14, which are first display computers. The display computers 21, 22, 23, and 24, which are the second display computers, are connected so as to be able to transmit images. Further, the display computers 11, 12, 13, and 14 and the display computers 21, 22, 23, and 24 are connected so as to communicate with each other.

  The above connection relationship will be described in detail. A central control unit is connected to a bus, and the image display apparatuses 1, 2, 3, and 4, display computers 11, 12, 13, 14, and Display computers 21, 22, 23, and 24 are connected. Here, the image display devices 1, 2, 3, 4, the display computers 11, 12, 13, 14 and the display computers 21, 22, 23, 24 are connected by a LAN interface or an RS232C interface. That is, the display computers 11, 12, 13, and 14 that are the first display computers and the display computers 21, 22, 23, and 24 that are the second display computers are connected by a LAN interface or an RS232C interface. ing.

  Next, the hardware configurations of the display computers 11, 12, 13, and 14 that are the first display computers and the display computers 21, 22, 23, and 24 that are the second display computers will be described. FIG. 2 is a hardware configuration diagram of the display computer 11. Since the display computers 11, 12, 13, and 14 and the display computers 21, 22, 23, and 24 all have the same hardware configuration, the hardware configuration of the display computer 11 will be described here.

  As shown in FIG. 2, the display computer 11 includes a processor 30 and a memory 31. The drawing function and the abnormality detection function of the display computer 11 are realized as functions of the processor 30 when the processor 30 of FIG. 2 executes a program stored in the memory 31 or the like. However, these may be realized in cooperation with a plurality of processors 30, for example. The drawing function and the abnormality detection function will be described later.

  Next, the operation of the video display system in the normal time will be described. FIG. 3 is a diagram showing an image drawn by the display computers 11, 12, 13, and 14 at the normal time. FIG. 4 is a diagram showing an image drawn by the display computers 21, 22, 23, 24 at normal times. FIG. 5 is a diagram showing a video displayed by the image display devices 1, 2, 3, and 4 at the normal time.

  The display computers 11, 12, 13, and 14 normally display windows A, C, E, and G that are window-like images on the screens of the image display devices 1, 2, 3, and 4, for example, as shown in FIG. , I, K are drawn. More specifically, the windows A and C displayed on the image display device 1 are drawn by the display computer 11. A window E displayed on the image display device 2 is drawn by the display computer 12. The window G displayed on the image display devices 1, 2, 3, 4 is drawn by the display computers 1, 2, 3, 4. The window I displayed on the image display devices 3 and 4 is drawn by the display computers 13 and 14. The window K displayed on the image display device 4 is drawn by the display computer 14.

  The display computers 21, 22, 23, and 24 normally display windows B, D, F, and H, which are window-like images, on the screens of the image display devices 1, 2, 3, and 4, as shown in FIG. , J is drawn. More specifically, the window B displayed on the image display device 1 is drawn by the display computer 21. The window D displayed on the image display devices 1 and 2 is drawn by the display computers 21 and 22. The window F displayed on the image display devices 2 and 4 is drawn by the display computers 22 and 24. The window H displayed on the image display device 3 is drawn by the display computer 23. The window J displayed on the image display device 4 is drawn by the display computer 24.

  As shown in FIG. 5, each of the image display devices 1, 2, 3, 4 performs a part of the drawing by the display computers 11, 12, 13, 14 and the drawing by the display computers 21, 22, 23, 24. The remaining image is combined and the combined image is displayed. Here, each of the image display devices 1, 2, 3, and 4 includes the display computers 11, 12, 13, and 14 and the windows A, 22, 23, and 24 that the display computers 21, 22, 23, and 24 output in the entire video display system. Priorities are set for B, C, D, E, F, G, H, I, J, and K, and the position size of the window is determined for each rectangular area of the video in each image display device. Composite the video area.

  Further, the display computers 11, 12, 13, and 14 and the display computers 21, 22, 23, and 24 have a function of detecting an abnormality of the communication partner. For example, the display computer 11 and the display computer 21 are connected to the same image display device 1 so as to be able to display video. Furthermore, the display computer 11 and the display computer 21 are connected to be communicable with each other. The display computer 11 detects an abnormality of the display computer 21 that is a communication partner, while the display computer 21 detects an abnormality of the display computer 11 that is a communication partner.

  For example, the abnormality detection is performed periodically with respect to the software operating in the display computer 11 or 21 via the LAN interface or the RS-232C interface. Is sent depending on the presence or absence of a response. Or, when the LAN interface is used as a communication means, the abnormality detection is performed by periodically operating ICMP (Internet Control Message Protocol) echoes on the OS in the display computer of the communication partner. (PING command) is transmitted, and it is performed depending on whether or not there is a response.

  During normal times, the first display computer and the second display computer transmit signals to the corresponding image display devices. The image display device receives the signal and turns on the synthesis of part and the rest of the drawing performed by the first display computer and the second display computer, that is, the first display computer and the second display. The composition of the drawing performed by the computer.

  On the other hand, an abnormality occurs in one display computer connected to an image display device, and another display computer connected to the same image display device detects the abnormality by the above method. In this case, the display computer also performs the rest of the screen drawing performed by the display computer in which an abnormality has occurred. That is, all the drawing is performed, and the image display apparatus is configured to turn off the combining of the drawing performed by the first display computer and the second display computer so as not to perform the combining.

  Here, when the composition of the image display device is turned ON, a part of the screen drawing by the first display computer and the rest of the screen drawing by the second display computer are stored in the frame memory in the image display device. It means overwriting. Further, turning off the composition of the image display device means that all the screen drawing by the normal display computer is written in the frame memory in the image display device.

  FIG. 6 is a diagram illustrating an image displayed on the image display device when the second display computer fails (when an abnormality is detected). For example, as shown in FIG. 6, an abnormality occurs in the display computer 21 connected to the image display device 1, and the display computer 11 connected to the same image display device 1 so as to be able to display video is displayed. When an abnormality of the display computer 21 is detected, the display computer 11 draws the display computer 21 in addition to the video (windows A and C, a part of the window G) drawn by itself. The video (window B, partial area of window D) that has been drawn is also drawn. Further, the display computer 11 controls to turn off the composition of the image display device 1 so that only the video output of the display computer 11 is displayed. Similarly, all images are displayed.

  Next, the operation of the display computer will be described with reference to FIG. FIG. 7 is a flowchart showing the operation of the display computer. When the power of the display computer is turned on, the operation shown in the flowchart of FIG. 7 is started. First, the display computer transmits a survival confirmation command or the like to the other display computer that is a communication partner, and performs abnormality detection based on the presence or absence of a response. When there is a response from the communication partner, the display computer determines that the communication partner is normal (Yes in step S1). The display computer sets i to 0 (step S2). Here, i is a window number to be drawn, and is stored in the memory 31, for example.

  If i is smaller than the number of windows (Yes in step S3), the window i is displayed in the display computer area, that is, in the area of the image display device to which the display computer is connected. It is determined whether or not the image is a video (step S4). For example, assume that window 0 indicates window A in FIG. 5 and window 1 indicates window B in FIG. Here, the information including the coordinates of all the images (windows A to K in FIG. 5) displayed on the four image display devices 1, 2, 3, and 4 from the central control unit to all the display computers. Is sent. This information is further associated with which display computer to draw. In step S4, it is determined whether or not the image is drawn by the first display computer or the second display computer connected to the corresponding image display device.

  When the window i is an image to be displayed in the area of the display computer, that is, in the area of the image display device to which the display computer is connected (Yes in step S4), the display computer displays the window i. Is a video to be drawn by itself (step S5). When the window i is an image to be drawn by itself (Yes in step S5), the display computer draws the window i (step S6), increments i by 1 (step S7), and then proceeds to step S3. Transition.

  When the window i is an image not displayed in the area of the display computer in step S4, that is, in the area of the image display device to which the display computer is connected (No in step S4), or the window i is If the video is not drawn by itself, that is, if the video is drawn by the other display computer (No in step S5), the display computer moves the process to step S7.

  When i is the same as the number of windows in step S3 (No in step S3), that is, when processing is performed up to windows A to K, the display computer is the image display device to which the display computer is connected. After controlling to turn on the composition (step S8), the process proceeds to step S1.

  When the display computer determines that there is no response because there is no response from the other display computer that is the communication partner, that is, when the communication partner detects an abnormality (No in step S1), the display computer sets i to 0. (Step S9).

  If i is smaller than the number of windows (Yes in step S10), it is determined whether or not window i is within the area of the display computer (step S11). When the window i is an image to be displayed in the area of the display computer, that is, in the area of the image display device to which the display computer is connected (Yes in step S11), the display computer displays the window i. (Step S12), i is incremented by 1 (step S12), and the process proceeds to step S10. Here, the process similar to step S5 is not performed between step S11 and step S12. This is because, in addition to the video that the display computer has drawn by itself, the video that has been drawn by the other display computer so far is also drawn.

  When the window i is not an image to be displayed in the area of the display computer, that is, in the area of the image display device to which the display computer is connected in step S11 (No in step S11), the display computer performs processing. To step S13.

  When i is the same as the number of windows in step S10 (No in step S10), that is, when processing is performed up to windows A to K, the display computer is the image display device to which the display computer is connected. After controlling to turn off the composition (step S14), the process proceeds to step S1.

  As described above, the video display system according to the embodiment is provided for each of the image display devices 1, 2, 3, and 4 and is connected to the corresponding image display devices 1, 2, 3, and 4, and normally Display computers 11, 12, 13, and 14 that perform part of screen rendering of the image display devices 1, 2, 3, and 4 corresponding to the occasion, and each image display device 1, 2, 3, 4 are provided Display computers 21, 22, 23, 24 connected to the corresponding image display devices 1, 2, 3, 4 and performing the remainder of the screen drawing of the corresponding image display devices 1, 2, 3, 4. And the display computers 11, 12, 13, 14 and the display computers 21, 22, 23, 24 connected to the same image display device 1, 2, 3, 4 are connected to be communicable with each other, and Has a function to detect abnormalities in the communication partner Of the display computers 11, 12, 13, 14 and the display computers 21, 22, 23, 24, the normal display computer is the screen of the corresponding image display device 1, 2, 3, 4 when an abnormality of the communication partner is detected. Do all of the drawing.

  Therefore, when an abnormality is detected in one of the display computers 11, 12, 13, 14 and the display computers 21, 22, 23, and 24 and drawing by the display computer is stopped, Drawing by the other display computer is not stopped. As a result, even after the abnormality of the display computer is detected, until the normal display computer performs all drawing of the screen, that is, until the video input of the image display device is switched, the image display is performed. It can be avoided that all images of the apparatus are stopped.

  In addition, during normal times, two display computers share the drawing with respect to each image display device, so that each display computer needs to draw only a part of the video. Thereby, the moving image update speed is increased, and the performance of video drawing can be improved.

  Further, when a display computer performs decoding processing of a high-load stream video, etc., only a part of the stream needs to be processed in each display computer, so even an inexpensive display computer with low performance may be used. This makes it possible to reduce the capital investment cost of the entire video display system.

  In addition, since both display computers are normally used, resources can be used effectively and capital investment costs can be effectively used.

  In addition, some video can be displayed until an abnormality of the display computer is detected and the image display device is controlled, so the video update speed will eventually decrease, but the video will not be interrupted. The operation of the monitoring control system can be continued.

  A window G shown in FIG. 5 is displayed on the screens of the four image display devices 1, 2, 3, and 4. When the display computer 11 fails, the display computer 21 replaces the display computer 11. However, in the case of moving image data, problems such as a decrease in the update speed occur. In this case, if the moving image update speed of the display computers 12, 13, 14 is controlled to be slow, the video display for the window G in the entire video display system can be controlled to be displayed without a sense of incongruity.

  The image display device synthesizes part and the rest of the drawing performed by the display computers 11, 12, 13, and 14 and the display computers 21, 22, 23, and 24 at normal times. Don't synthesize. Therefore, even when an abnormality is detected, by displaying the entire screen drawing by a normal display computer, it is possible to display all the images without missing some images.

  Since the display computers 11, 12, 13, 14 and the display computers 21, 22, 23, 24 are connected by a LAN interface or an RS232C interface, by periodically transmitting a survival confirmation command or an ICMP echo, It is possible to easily detect the abnormality of the communication partner.

  In the present embodiment, two display computers are connected to each image display device. However, two display computers are not necessarily connected, and three or more display computers may be connected.

  Further, in the video display system, the 2 × 2 multi-display is configured by the four image display devices, but for example, the 3 × 3 multi-display may be configured by the nine image display devices. However, a multi-display having a larger number of surfaces may be configured.

  In addition, as a method of detecting an abnormality in the display computer, another device that detects an abnormality may be used. Specifically, a survival confirmation command may be periodically transmitted from another device that detects an abnormality to software operating in the display computer via a LAN interface or RS-232C. Alternatively, when a LAN interface is used as the communication means, an ICMP echo (PING command) may be transmitted from another device that detects an abnormality to the OS in the display computer.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

  1, 2, 3, 4 Image display device 11, 12, 13, 14 First display computer 21, 22, 22, 23, 24 Second display computer.

Claims (3)

A video display system for displaying video on a multi-screen configured by a plurality of image display devices,
A first display computer that is provided for each of the image display devices and connected to the corresponding image display device and that performs a part of drawing of the screen of the image display device corresponding to the normal time;
A second display computer provided for each of the image display devices, connected to the corresponding image display device, and performing the rest of the drawing of the screen of the image display device corresponding to the normal time;
With
The first display computer and the second display computer connected to the same image display device are connected to be communicable with each other and have a function of detecting an abnormality of a communication partner,
A video display system in which a normal display computer out of the first display computer and the second display computer performs all drawing of the screen of the corresponding image display device when an abnormality of a communication partner is detected.   The image display device synthesizes the part and the rest of the drawing performed by the first display computer and the second display computer in a normal state, and the normal display computer at the time of detecting an abnormality The video display system according to claim 1, wherein the composition is not performed.   The video display system according to claim 1, wherein the first display computer and the second display computer are connected by a LAN interface or an RS232C interface.

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