JP2009216808A - Display device, multi-display system, multi-display method, and program to be performed by computer in order to achieve multi-display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device free from occurrence of irregular luminance on a multi-display screen. <P>SOLUTION: Any of the respective display devices 2 constituting the multi-display screen is set as representation, and illuminance detected by a sensor 18 of the display device 2 set as the representation, that is, illuminance around the screen of the display device 2 set as the representation, is obtained. Then, luminance corresponding to the illuminance is obtained, and the luminances on the screens of the respective display devices 2 are adjusted to the obtained luminance, whereby the luminances on the screens of the respective display devices 2 are uniformized. By cyclically performing such luminance adjustment, the luminances are varied in accordance with an illuminance change around the screen of the display device 2 set as the representation. By fitting the luminance on the multi-display screen to ambient brightness, the multi-display screen is prevented from getting hard-to-view whether it is dark or bright. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device that is a component of a multi-display screen, a multi-display system that includes a plurality of display devices, a multi-display method, and a program that is executed by a computer to implement the method.

  In a multi-display system, a plurality of display device screens are arranged close to each other to form one large screen (hereinafter referred to as a multi-display screen), and an enlarged image is displayed on the multi-display screen. For example, as shown in FIG. 14, four display devices 701 a to 701 d are arranged two by two in the vertical and horizontal directions to form a multi-display screen 702 that has double the vertical and horizontal widths. Displays a 2x enlarged image.

  The display device used in such a system is not a dedicated device for multi-displays, but is a popular product that can be used alone.

  By the way, there is a display device that detects the illuminance around the display device with a sensor and automatically adjusts the luminance of the screen according to the detected illuminance. Thereby, the brightness of the screen is appropriately set even in a dark environment or a bright environment, and the screen becomes easy to see.

  For example, as shown in FIG. 14, a sensor 703 is provided on the screen edge of each of the display devices 701a to 701d, the illuminance L around the display device screen is detected by the sensor 703, and a data table 711 as shown in FIG. Then, the luminance K corresponding to the detected illuminance L is obtained, and the luminance of the display device screen is adjusted and controlled to the obtained luminance K. Thereby, the brightness of the screen is automatically adjusted according to the brightness around the display device screen.

In Patent Document 1, a plurality of sensors for detecting the illuminance around the display device are provided, the highest illuminance is selected from the illuminances detected by each sensor, and the brightness of the screen is determined according to the highest illuminance. Is adjusted. Further, in Patent Document 2, a plurality of sensors for detecting the illuminance around the display device are provided, the average illuminance is obtained from each illuminance detected by each sensor, and the brightness of the screen is adjusted according to the average illuminance. .
Japanese Patent Laid-Open No. 2-141796 JP 2007-310096 A

  However, if a display device that automatically adjusts the screen brightness is applied in a multi-display system, the brightness of each display device screen will vary, resulting in uneven brightness on the multi-display screen, making it difficult to see the multi-display screen. was there. For example, as shown in FIG. 14, in a situation where illumination light is incident on the display device 701a or the display device 701d is in the shadow of the illumination light, the illuminance detected by the sensor 703 of each of the display devices 701a to 701d is large. In contrast, since the screen brightness of each of the display devices 701a to 701d is automatically adjusted according to each illuminance, the brightness of each screen varies, making it difficult to see the multi-display screen 702.

  If the automatic adjustment of the brightness of each display device screen is turned off, such a problem will not occur. In this case, however, the multi-display screen is difficult to see when the brightness around the multi-display screen changes. Become.

  In Patent Documents 1 and 2, the illuminance around the display device is detected by a plurality of sensors. Even if such a display device is applied, the illuminance is detected and the luminance is controlled for each display device. That doesn't change the problem of multi-display screens.

  Therefore, the present invention has been made in view of the above-described conventional problems, and a display device, a multi-display system, a multi-display method, and a computer for realizing the method that do not cause uneven brightness of a multi-display screen. An object of the present invention is to provide a program executed by the above.

  In order to solve the above problems, the display device of the present invention is arranged side by side with another display device, and detects the illuminance around the display device in the display device that forms a multi-display screen together with the other display device. Illuminance detection means, brightness adjustment means for adjusting the brightness of its own display device screen, data communication means for data communication with the other display device, and whether or not the display device is a reference When the reference determination unit and the reference determination unit determine that the display device is the reference, the luminance corresponding to the illuminance detected by the illuminance detection unit is obtained, and the obtained luminance is obtained through the data communication unit. Is transmitted to the other display device, and the brightness adjusting means is controlled to adjust the brightness of the display device screen to the determined brightness. If it is determined that it is not, the brightness corresponding to the illuminance detected by the other display device is received through the data communication means, the brightness adjusting means is controlled, and the brightness of the display device screen is received. And a control means for adjusting.

  For example, the reference determination unit compares the arrangement position of the display device on the multi-display screen with the reference position of the reference display device, and if the arrangement position of the display device matches the reference position, If it is determined that the display device is the reference, and if the arrangement position of the display device does not match the reference position, it is determined that the display device is not the reference.

  Further, the multi-display system of the present invention is a multi-display system that forms a multi-display screen by a plurality of display devices arranged side by side. Illuminance detection means that is provided in each of the display devices and detects the illuminance around the display device. A brightness adjusting means for adjusting the brightness of the display device screen, a data communication means for data communication provided for each display device, and a display serving as a reference among the display devices. A display device that is determined to be a reference by the reference determination unit, obtains a luminance corresponding to the illuminance detected by the illuminance detection unit, and obtains the obtained luminance through the data communication unit. Is transmitted to another display device, and the brightness adjusting means is controlled to adjust the brightness of the display device screen to the determined brightness. And the other display device, via the data communication means receives the determined brightness, and controls the brightness adjusting means is adjusted to the brightness received the luminance of the other display screen.

  For example, in the display device determined to be the reference by the reference determination unit, the luminance corresponding to the illuminance detected by the illuminance detection unit is obtained using a computer.

  Further, the multi-display system of the present invention is a multi-display system that forms a multi-display screen by a plurality of display devices arranged side by side. Illuminance detection means that is provided in each of the display devices and detects the illuminance around the display device. A brightness adjusting means for adjusting the brightness of the display device screen, a data communication means for data communication provided for each display device, and a display serving as a reference among the display devices. A reference determination unit that determines the device, and a luminance setting unit that obtains luminance corresponding to the illuminance detected by the illuminance detection unit of the display device that is determined to be the reference by the reference determination unit. The display device receives the brightness obtained by the brightness setting means through the communication means and controls the brightness adjusting means. The brightness of the surface is adjusted to the brightness received the.

  For example, the brightness setting means is a computer, and the brightness determined by the computer is transmitted from the computer to each display device.

  Further, the multi-display method of the present invention is a multi-display method in which a multi-display screen is configured by a plurality of display devices arranged side by side, which one of the display devices is a reference and is a reference. The luminance corresponding to the illuminance detected by the illuminance detection means of the display device determined as is obtained, and the luminance of each display device screen is adjusted to the obtained luminance.

  The program of the present invention is executed by a computer in order to realize the multi-display method of the present invention.

  In such a display device according to the present invention, it is assumed that the display device is arranged side by side with other display devices to form a multi-display screen. When the luminance corresponding to the illuminance is obtained, transmitted to another display device, the luminance of the display device screen is adjusted to the obtained luminance, and when it is determined that the display device is not the reference The brightness corresponding to the illuminance detected by the other display device is received, and the brightness adjusting means is controlled to adjust the brightness of the display device screen to the received brightness. Therefore, when any one of the plurality of display devices is set as the reference display device, the luminance of all the display device screens is adjusted to the luminance corresponding to the illuminance detected by the reference display device. The brightness of all the display device screens is unified, and the uneven brightness of the multi-display screen does not occur.

  For example, when the arrangement position of the display device on the multi-display screen is compared with the reference position, and the arrangement position of the display device matches the reference position, it is determined that the display device is the reference. If the arrangement position of the display device does not coincide with the reference position, it is determined that the own display device is not the reference. In this case, the reference display device can be changed by changing the reference position.

  Also in the multi-display system of the present invention, it is possible to achieve the same effects as the display device of the present invention.

  Further, in this system, it is possible to perform processing for obtaining the luminance corresponding to the illuminance detected by the illuminance detecting means by the computer of each display device or an external computer. When processing is performed by an external computer, the obtained luminance is transmitted from the computer to each display device.

  The same effects as the display device of the present invention can also be achieved in the multi-display method of the present invention and the program executed by the computer to realize the method.

  The computer can implement the present invention by reading a program from a recording medium, receiving the program through a communication network, and executing the program. In a system composed of a plurality of computers and the Internet, a plurality of processes can be distributed to a plurality of terminals. Therefore, the program can be applied not only to a single terminal such as a computer but also to a system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a block diagram showing an embodiment of a display device of the present invention. FIG. 2 is a diagram showing a multi-display system to which the display device of FIG. 1 is applied.

  The multi-display system 1 in FIG. 2 includes four display devices 2 in FIG. 1 (labeled 2a to 2p in FIG. 2) arranged vertically and horizontally, using a total of 16 display devices 2a to 2p. Composed.

  In this multi-display system 1, a large multi-display screen 3L composed of a total of 16 display devices 2 in a vertical and horizontal direction, a medium multi-display screen 3M composed of a total of nine display devices 2 in a vertical and horizontal direction, and two vertical and horizontal units. A small multi-display screen 3S composed of a total of four display devices 2 can be switched, and all the display devices 2 can be used individually. Regardless of which multi-display screen is used, an enlarged image corresponding to the size of the multi-display screen can be displayed. For example, when the video G is displayed on a single display device 2 as shown in FIG. 3A, a small display composed of a total of four display devices 2 each in vertical and horizontal directions as shown in FIG. 3B. When the multi-display screen 3S is configured, an enlarged video GS that is twice as long and horizontal is displayed on the small multi-display screen 3S. Similarly, when the medium multi-display screen 3M is configured, an enlarged image that is three times larger in both vertical and horizontal directions is displayed on the middle multi-display screen 3M, and when the large multi-display screen 3L is configured, four times larger image in both the vertical and horizontal directions is displayed. Is displayed on the large multi-display screen 3L.

  As shown in FIG. 1, the display device 2 includes a plurality of video input terminals 11-1 to 11-N, and the video signals are added to the video input terminals 11-1 to 11-N, respectively. Is input to the display memory 12 through one of the video input terminals and stored. In addition, a plurality of video output terminals 13-1 to 13-N are provided, and a video signal is input through the video input terminal, and at the same time, the video signal is output through any of the video output terminals 13-1 to 13-N. can do.

  The central processing unit 14 is a microprocessor, a programmable LSI (FPGA (Field Programmable Gate Array)), a specific application integrated circuit (ASIC (ASIC)), and the like, and controls the entire display device 2.

  For example, the central processing unit 14 controls writing / reading of the video signal to / from the display memory 12, and inputs the video signal from the video input terminal to the display memory 12, or sends the video signal from the display memory 12 to the display processing unit 15. To output.

  When the video signal is input, the display processing unit 15 performs various processes on the video signal and then outputs the video signal to the display unit 16. As various processes for the video signal, there is a process for converting the video signal into a method suitable for the display unit 16. When a multi-display screen is used, a video signal indicating a video displayed on the screen of the display unit 16 is extracted from all video signals in the display memory 12 in accordance with the position of the display device 2 on the multi-display screen. Then, an enlargement process corresponding to the size of the multi-display screen is performed on the extracted video signal. Then, the extracted and enlarged video signal is output to the display unit 16. As a result, the cut and enlarged image is displayed on the screen of the display unit 16.

  The display unit 16 is a liquid crystal display panel, a CRT, a plasma display panel, or the like. The video signal input method may be LVDS, TTL, or the like. The display unit 16 receives the video signal from the display processing unit 15 and displays the video indicated by the video signal on the screen.

  The central processing unit 14 controls the luminance of the screen of the display unit 16 through the luminance control unit 17. For example, if the display unit 16 is a liquid crystal display panel, the central processing unit 14 drives and controls the backlight of the liquid crystal display panel through the luminance control unit 17 to control the luminance of the screen of the display unit 16.

  The sensor 18 is provided near the screen of the display unit 16, detects the brightness (illuminance) around the screen, and outputs the detected illuminance to the central processing unit 14.

  The remote control light receiving unit 21 receives an infrared remote control signal emitted from an external remote control (not shown), photoelectrically converts the infrared remote control signal, and outputs an electrical remote control signal. The remote control signal is input to the central processing unit 14 through the remote control operation processing unit 22. The central processing unit 14 responds to this remote control signal.

  The serial interface 23 receives an external control signal and outputs the control signal to the central processing unit 14 through the serial communication processing unit 24. The central processing unit 14 processes this control signal and responds as necessary.

  The central processing unit 14 outputs a control signal to the outside through the serial communication unit 25 and the serial interface 26.

  The internal storage unit 27 is a RAM or the like, and is used as a work area for the central processing unit 14 or stores a multi-display table 27A, a display position representative table 27B, and an illuminance / luminance table 27C. The central processing unit 14 refers to these tables 27A, 27B, and 27C, performs display control for configuring a multi-disc screen according to the stored contents of these tables 27A, 27B, and 27C, Control screen brightness.

  The external storage unit 28 is an HDD, for example, and stores programs, various data, and the like. The central processing unit 14 reads a necessary program from the external storage unit 28 and executes it to configure a multi-display screen or to control screen brightness.

  FIG. 4 shows the stored contents of the multi-display table 27A. As shown in FIG. 4, the multi-display table 27A stores an automatic brightness adjustment flag AutoBright, an enlargement mode Enl, a display position Pos, a representative flag RepFlg, an illuminance value Sensor, a brightness value Bright, and a previous brightness value PreBright.

  The automatic brightness adjustment flag AutoBright indicates whether to automatically adjust the brightness of the screen of the display unit 16, and is set to “0” or “1”. “0” indicates that automatic adjustment of luminance is not performed, and “1” indicates that automatic adjustment of luminance is performed.

  The enlargement mode Enl is an index indicating any one of the screen of the single display device 2, the small multi-display screen 3S, the middle multi-display screen 3M, and the large multi-display screen 3L as described above. 3 ". “0” indicates display on the screen of the single display device 2 as shown in FIG. 3A, and “1” indicates display on the small multi-display screen 3S as shown in FIG. “2” indicates display on the medium multi-display screen 3M, and “3” indicates display on the large multi-display screen 3L.

  The display position Pos is an index indicating the position of the display device 2 and corresponds to the value of the enlargement mode Enl, that is, the screen of the single display device 2, the small multi-display screen 3S, the middle multi-display screen 3M, and the large multi-display screen. It is set in a range of “0”, “0” to “3”, “0” to “8”, and “0” to “15” depending on which of 3L is displayed. When the enlargement mode Enl is “0” and the display on the screen of the single display device 2 as shown in FIG. 3A is being performed, the display position Pos is the default as shown in FIG. Is set to “0”. Further, when the enlargement mode Enl is “1” and the display on the small multi-display screen 3S as shown in FIG. 3B is being performed, four display devices are provided as shown in FIG. 5B. Since 2 is used, there are four display positions Pos, and the display positions Pos are set in the range of “0” to “3”. Further, when the enlargement mode Enl is “2” and the display on the middle multi-display screen 3M is being performed, nine display devices 2 are used as shown in FIG. There is a display position Pos, and the display position Pos is set in the range of “0” to “8”. Further, when the enlargement mode Enl is “3” and the large multi-display screen 3L is displayed, 16 display devices 2 are used as shown in FIG. There is a display position Pos, and the display position Pos is set in the range of “0” to “15”.

  In the case of the small multi-display screen 3S, the display positions Pos of the display devices 2c, 2d, 2g to 2p deviating from the screen 3S are not set, and in the case of the medium multi-display screen 3M, deviating from the screen 3M. The display positions Pos of the respective display devices 2d, 2h, 2l to 2p are not set.

  The representative flag RepFlg indicates whether or not the own display device 2 is selected as a representative of each display device 2 constituting the multi-display screen when the multi-display screen is displayed. It is set to “0” or “1”. “0” indicates that its own display device 2 is not representative, and “1” indicates that its own display device 2 is representative.

  The illuminance value Sensor indicates the illuminance around the screen detected by the sensor 18 of the display device 2 of its own.

  The brightness value Bright indicates the brightness of the screen of the display unit 16 adjusted and set by the central processing unit 14 and the brightness control unit 17. The previous luminance value PreBright indicates the luminance of the screen of the display unit 16 that was previously adjusted and set by the central processing unit 14 and the luminance control unit 17. The brightness of the screen of the display unit 16 is periodically updated, the brightness value Bright indicates the brightness of the current screen, and the previous brightness value PreBright indicates the brightness of the previous screen.

  FIG. 6 shows the stored contents of the display position representative table 27 </ b> B in the internal storage unit 27. As shown in FIG. 6, the display position representative table 27B stores an enlargement mode Enl, a display position Pos, and a representative position Dpos.

  In the display position representative table 27B, “0” to “3” indicating the screen of the single display device 2, the small multi-display screen 3S, the middle multi-display screen 3M, and the large multi-display screen 3L are stored as the enlargement mode Enl. ing.

  The display position Pos is set according to the value of the enlargement mode Enl, and is set for each display device 2a to 2p of the multi-display system 1 of FIG. In the case of the enlargement mode Enl “0”, that is, the screen of the single display device 2, the value of the display position Pos is not set. Further, in the case of the enlargement mode Enl “1”, that is, the small multi-display screen 3S, the display positions Pos of the respective display devices 2a, 2b, 2e, and 2f are entered in the screens of the respective display devices in FIG. Is set to a value. Further, in the case of the enlargement mode Enl “2”, that is, the middle multi-display screen 3M, the display positions Pos of the respective display devices 2a, 2b, 2c, 2e, 2f, 2g, 2i, 2j, 2k are shown in FIG. The value entered on the screen of each display device is set. In the case of the enlargement mode Enl “3”, that is, the large multi-display screen 3L, the display positions Pos of the display devices 2a to 2p are entered in the screens of the display devices 2a to 2p in FIG. Is set to a value.

  The representative position Dpos is set according to the value of the enlargement mode Enl, but is commonly set for each of the display devices 2a to 2p. In the case of the screen of the single display device 2 in the enlargement mode Enl “0”, the representative position Dpos is not set. Further, in the case of the small multi-display screen 3S in the enlargement mode Enl “1”, the representative position Dpos is set to “0” indicating the position of the upper left display device 2a in FIG. Further, in the case of the enlargement mode Enl “2” and the middle multi-display screen 3M, the representative position Dpos is set to “4” indicating the position of the central display device 2f in FIG. In the case of the enlargement mode Enl “3” and the large multi-display screen 3L, the representative position Dpos is set to “4” indicating the position of the display device 2f near the center of FIG.

  FIG. 7 shows the stored contents of the illuminance / luminance table 27 </ b> C in the internal storage unit 27. As shown in FIG. 7, in the illuminance luminance table 27C, the illuminance around the screen of the display unit 16 has six ranges “0” to “20”, “21” to “40”, “41” to “60”, “ 61 ”to“ 80 ”,“ 81 ”to“ 100 ”, and“ 100 ”to stepwise, and six levels of luminance values“ 0 ”,“ 1 ”,“ 2 ”corresponding to the respective illuminance ranges, “3”, “4”, and “5” are set.

  Here, the value of the automatic brightness adjustment flag AutoBright in the multi-display table 27A is written as instructed from the outside. For example, a remote control signal indicating the value of the automatic brightness adjustment flag AutoBright is transmitted from an external remote controller (not shown) to the remote control light receiving unit 21, and the value of the automatic brightness adjustment flag AutoBright is sent to the central processing unit 14 through the remote control operation processing unit 22. The central processing unit 14 writes the value of the automatic brightness adjustment flag AutoBright into the multi-display table 27A. Therefore, the value of the automatic brightness adjustment flag AutoBright is set to the same value in any of the display devices 2a to 2p of the multi-display system 1 in FIG.

  Further, the value of the enlargement mode Enl in the multi-display table 27A is also written from the central processing unit 14 to the multi-display table 27A when instructed from the outside. In any of the display devices 2a to 2p of the multi-display system 1, the value of the enlargement mode Enl is set to the same value.

  Furthermore, the value of the display position Pos in the multi-display table 27A is “0” as a default value, and when the value of the enlargement mode Enl is set to any one of “1” to “3”, the display position representative table. The value of the display position Pos corresponding to the value of the enlargement mode Enl is read from 27B and set to this read value. As described above, since the value of the display position Pos in the display position representative table 27B is set for each display device constituting the multi-display screen, the value of the display position Pos in the multi-display table 27A is also set in each display. It is set for each device. When the value of the enlargement mode Enl is updated from “1” to “3” to “0”, the value of the display position Pos in the multi-display table 27A is returned to the default value “0”.

  The value of the representative flag RepFlg in the multi-display table 27A is “0” as a default value, and when any of “1” to “3” is written as the value of the enlargement mode Enl, the display position representative table. The value of the representative position Dpos corresponding to the value of the enlargement mode Enl is read from 27B, and is set to “1” when the read representative position Dpos value matches the display position Pos. It is set to “0” when the position Dpos value does not coincide with the display position Pos. Specifically, when the enlargement mode Enl “1” is written (in the case of the small multi-display screen 3S), the representative position Dpos “0” corresponding to the enlargement mode Enl “1” is read from the display position representative table 27B. Since the representative position Dpos “0” coincides with the display position Pos “0” of the upper left display device 2a in FIG. 5B, the representative flag RepFlg of the display device 2a is set to “1”, The representative flag RepFlg of each display device is set to “0”. When the enlargement mode Enl “2” is written (in the case of the middle multi-display screen 3M), the representative position Dpos “4” corresponding to the enlargement mode Enl “2” is read from the display position representative table 27B. Since the position Dpos “4” coincides with the display position Pos “4” of the central display device 2f in FIG. 5C, the representative flag RepFlg of the display device 2f is set to “1”, and the other display devices The representative flag RepFlg is set to “0”. Further, when the enlargement mode Enl “3” is written (in the case of the large multi-display screen 3L), the representative position Dpos “4” corresponding to the enlargement mode Enl “3” is read from the display position representative table 27B, and the representative Since the position Dpos “4” coincides with the display position Pos “4” of the display device 2f near the center of FIG. 5D, the representative flag RepFlg of the display device 2f is set to “1”, and each of the other displays The representative flag RepFlg of the device is set to “0”. When the value of the enlargement mode Enl is updated from “1” to “3” to “0”, the value of the representative flag RepFlg in the multi-display table 27A is returned to the default value “0”.

  Further, the illuminance value Sensor in the multi-display table 27A is a value in which the illuminance value around the screen of the display unit 16 detected by the sensor 18 is written. Specifically, the illuminance is periodically detected by the sensor 18, and the detected illuminance value is input to the central processing unit 14, and the central processing unit 14 writes the illuminance value to the multi-display table 27A. .

  As the brightness value Bright in the multi-display table 27A, when the illuminance value Sensor is written, the brightness value corresponding to the illuminance value Sensor is read from the illuminance brightness table 27C and this brightness value is written or other The brightness value received from the display device 2 is written. Further, the previous brightness value PreBright is the brightness value Bright written after the brightness value Bright has been written and updated.

  Next, in the multi-display system 1 of FIG. 2, the display devices 2a to 2p are serially connected, and video signals are sequentially transmitted in the downstream direction from the front display device 2a to the last display device 2p. . Specifically, the video output terminals 13-1 to 13-N of the front display device 2 are connected to the video input terminals 11-1 to 11-N of the rear display device 2, and the video signal is displayed to the front display device 2. To the subsequent display device 2. Accordingly, the video signals output from the front display device 2a are sequentially transmitted to the display devices 2b to 2p and stored in the display memories 12 of all the display devices 2a to 2p.

  The control signal is transmitted / received between the display device 2 at the front stage and the display device 2 at the rear stage, and transmitted / received in the downstream direction from the display device 2a at the front stage to the display device 2p at the last stage, or the display device at the last stage. 2p is sent and received in the upstream direction from the display device 2a at the front stage. Specifically, the serial interface 26 of the front display device 2 is connected to the rear serial interface 23, and a control signal is transmitted and received between the front display device 2 and the rear display device 2.

  Here, when the screen of a single display device 2 is used as shown in FIG. 3A, the enlargement mode Enl is set to “0” in the multi-display table 27A of the internal storage unit 27 of each display device 2. .

  In this case, since the enlargement mode Enl is set to “0” in any of the display devices 2, the central processing unit 14 instructs the display processing unit 15 about the enlargement mode Enl “0”. Since the enlargement mode Enl “0” is instructed, the display processing unit 15 inputs all the video signals in the display memory 12 and outputs all the video signals to the display unit 16. The display unit 16 displays the entire video indicated by the entire video signal on the screen. As described above, since the video signal is sequentially transmitted from the front display device 2a to the last display device 2p and stored in the display memory 12 of all the display devices, the screen of each display device 2 is displayed on the screen. The same video is displayed.

  Further, as shown in FIG. 3B, when a small multi-display screen 3S composed of a total of four display devices 2 is used, the multi-display table 27A of each of the four display devices 2a, 2b, 2e, and 2f is enlarged. Mode Enl is set to “1”. Further, the display position Pos is set to “0” in the multi-display table 27A of the display device 2a, the display position Pos is set to “1” in the multi-display table 27A of the display device 2b, and the multi-display table 27A of the display device 2e. The display position Pos is set to “2”, and the display position Pos is set to “3” in the multi-display table 27A of the display device 2f.

  In the display device 2a, since the enlargement mode Enl is set to “1” and the display position Pos is set to “0”, the central processing unit 14 sets the enlargement mode Enl “1” and the display position Pos “0”. "To the display processing unit 15. Since the display processing unit 15 is instructed with the enlargement mode Enl “1” and the display position Pos “0”, the display device 2a displays the upper left area of the left and right upper and lower areas in the small multi-display screen 3S of FIG. The video signal indicating the 1/4 video displayed in the upper left area is cut out and extracted from all the video signals in the display memory 12, and the extracted video signal is vertically and horizontally 2 A double enlargement process is performed, and the extracted and enlarged video signal is output to the display unit 16. As a result, on the screen of the display unit 16, only the upper left quarter image of all the images is enlarged and displayed twice in both vertical and horizontal directions.

  In the display device 2b, since the enlargement mode Enl is set to “1” and the display position Pos is set to “1”, the central processing unit 14 sets the enlargement mode Enl “1” and the display position Pos “1”. "To the display processing unit 15. Since the display processing unit 15 has been instructed with the enlargement mode Enl “1” and the display position Pos “1”, the display device 2b displays the upper right region of the left and right upper and lower regions in the small multi-display screen 3S of FIG. The video signal indicating the 1/4 video displayed in the upper right area is cut out and extracted from all video signals in the display memory 12, and the extracted video signal is vertically and horizontally 2 A double enlargement process is performed, and the extracted and enlarged video signal is output to the display unit 16. Thereby, on the screen of the display unit 16, only the upper right ¼ image of all the images is enlarged and displayed twice in both vertical and horizontal directions.

  In the display device 2e, since the enlargement mode Enl is set to “1” and the display position Pos is set to “2”, the left and right upper and lower areas in the small multi-display screen 3S in FIG. It is determined that the lower left area is the position of the display device 2e, and a video signal indicating a ¼ video displayed in the lower left area is cut out from all the video signals in the display memory 12 and extracted. Is subjected to a double enlargement process both vertically and horizontally, and the extracted and enlarged image signal is output to the display unit 16, and only the lower right quarter image is doubled both vertically and horizontally on the screen of the display unit 16. Zoom in.

  In the display device 2f, since the enlargement mode Enl is set to “1” and the display position Pos is set to “3”, the left and right upper and lower regions in the small multi-display screen 3S in FIG. The lower right area is determined to be the position of the display device 2f, and a video signal indicating a 1/4 video displayed in the lower left area is extracted from all video signals in the display memory 12 and extracted. The signal is subjected to a double enlargement process both vertically and horizontally, and only the lower left quarter image is enlarged and displayed twice both vertically and horizontally on the screen of the display unit 16.

  As a result, on the small multi-display screen 3S in FIG. 5B, the entire image enlarged twice as long and horizontally is displayed. However, in the case of the small multi-display screen 3S, the display positions Pos of the respective display devices 2c, 2d, 2g to 2p deviating from the screen 3S are not set in the multi-display table 27A, and these display devices 2c, 2d, No display is performed for 2g to 2p.

  Further, as shown in FIG. 5C, when the middle multi-display screen 3M including a total of nine display devices 2 is used, each of the nine display devices 2a, 2b, 2c, 2e, 2f, 2g, 2i, 2j In the 2k multi-display table 27A, the enlargement mode Enl is set to “2”. In the multi-display table 27A of the nine display devices 2, the display positions Pos are “0”, “1”, “2”, “3”, “4”, “5”, “6”, “7” and “8” are set.

  In the display device 2a, since the enlargement mode Enl is set to “2” and the display position Pos is set to “0”, among the nine areas in the multi-display screen 3M in FIG. It is determined that the upper left area is the position of the display device 2a, and a video signal indicating 1/9 video displayed in the upper left area is extracted from all the video signals in the display memory 12, and the extracted video signal is extracted. The image is subjected to enlargement processing of 3 times both vertically and horizontally, and only the 1/9 image on the upper left is enlarged and displayed 3 times vertically and horizontally on the screen of the display unit 16.

  Similarly, in the other display devices 2b, 2c, 2e, 2f, 2g, 2i, 2j, and 2k, the enlargement mode Enl is set to “2”, and the respective display positions Pos are set to “1” to “8”. Since it is set, one of the nine areas in the multi-display screen 3M in FIG. 5C is determined to be the corresponding position, and 1/9 video displayed in the determined area is displayed. The extracted video signal is cut out from all the video signals in the display memory 12 and extracted, and the extracted video signal is subjected to enlargement processing three times in both the vertical and horizontal directions, and 1/9 video is displayed on the screen of the display unit 16 in both vertical and horizontal directions. Enlarged display 3 times.

  As a result, on the multi-display screen 3M in FIG. 5 (c), the entire image enlarged three times vertically and horizontally is displayed. However, in the case of the middle multi-display screen 3M, the display positions Pos of the respective display devices 2d, 2h, 2l to 2p deviating from the screen 3M are not set in the multi-display table 27A, and these display devices 2d, 2h, No display is performed in 2l to 2p.

  Further, as shown in FIG. 5D, when a large multi-display screen 3L composed of a total of 16 display devices 2 is used, in the multi-display table 27A of each of the 16 display devices 2a to 2p, the enlargement mode Enl is “ 3 ". Further, in the multi-display table 27A of the 16 display devices 2, the respective display positions Pos are set to “0” to “15”.

  In the display device 2a, since the enlargement mode Enl is set to “3” and the display position Pos is set to “0”, among the 16 areas in the large multi-display screen 3L in FIG. It is determined that the upper left area is the position of the display device 2a, and a video signal indicating 1/16 video displayed in the upper left area is extracted from all video signals in the display memory 12, and the extracted video signal is extracted. The image is subjected to enlargement processing four times in both vertical and horizontal directions, and only the image of the upper left 1/16 is enlarged and displayed four times in both vertical and horizontal directions on the screen of the display unit 16.

  Similarly, in the other display devices 2b to 2p, since the enlargement mode Enl is set to “3” and the respective display positions Pos are set to “1” to “15”, FIG. It is determined that one of the 16 areas on the large multi-display screen 3L is a corresponding position, and a video signal indicating 1/16 video displayed in the determined area is displayed as an all video signal in the display memory 12. The extracted video signal is subjected to an enlargement process of 4 times both vertically and horizontally, and 1/16 image is enlarged and displayed 4 times vertically and horizontally on the screen of the display unit 16.

  As a result, on the large multi-display screen 3L in FIG. 5D, the entire image enlarged four times in both the vertical and horizontal directions is displayed.

  By the way, when the screen of the single display device 2 is used, the illuminance around the screen may be detected for each display device 2 and the brightness of the screen may be adjusted according to the illuminance, but a multi-display screen is used. Sometimes, when such brightness adjustment for each display device 2 is performed, since the illuminance around the screen is different for each display device 2, the screen brightness is also different, and uneven brightness is present on the multi-display screen. Arise.

  Therefore, in the present embodiment, when a multi-display screen is used, the screen brightness of the plurality of display devices 2 constituting the multi-display screen is made uniform while adjusting so that the brightness of the multi-display screen does not vary. Yes.

  Specifically, any one of the display devices 2 constituting the multi-display screen is set as a representative, and the illuminance detected by the sensor 18 of the representative display device 2, that is, the screen periphery of the representative display device 2. The luminance corresponding to the illuminance is obtained, the screen brightness of each display device 2 is adjusted to the obtained brightness, and the screen brightness of each display device 2 is made uniform. In addition, by periodically performing such brightness adjustment, the brightness is changed according to the illuminance change around the screen of the representative display device 2, and the brightness of the multi-display screen is adjusted to the brightness of the environment. The multi-display screen does not become difficult to see even when it is dark or bright.

  Next, a procedure for adjusting and setting the brightness of such a multi-display screen will be described.

  FIG. 8 is a flowchart showing a processing procedure for adjusting the brightness of the multi-display screen. 8 is performed in parallel by any of the 16 display devices 2a to 2p in total in the multi-display system 1 of FIG.

  First, in the display device 2, the central processing unit 14 refers to the multi-display table 27A in the internal storage unit 27 and determines whether or not the enlargement mode Enl is set to “0” (step S101).

  For example, if the enlargement mode Enl is set to “0” (“No” in step S101), the central processing unit 14 instructs the display processing unit 15 about the enlargement mode Enl “0” as described above. Then, the entire video signal in the display memory 12 is output from the display processing unit 15 to the display unit 16, and the entire video indicated by the entire video signal is displayed on the screen of the display unit 16 (step S102).

  At this time, since the value of the enlargement mode Enl in the multi-display table 27A is “0” in any of the display devices 2, the same video is displayed on those screens.

  The central processing unit 14 then refers to the multi-display table 27A and determines whether the automatic brightness adjustment flag AutoBright is set to “0” or “1” (step S103). For example, if the automatic brightness adjustment flag AutoBright is set to “0” (“No” in step S103), the process of FIG. 8 ends without adjusting the brightness of the screen of the display unit 16.

  If the automatic brightness adjustment flag AutoBright is set to “1” (“Yes” in step S103), the central processing unit 14 determines the illuminance value around the screen of the display unit 16 detected by the sensor 18. The illuminance value is obtained and written as the illuminance value Sensor in the multi-display table 27A, the luminance value corresponding to the illuminance value Sensor is read from the illuminance luminance table 27C, and this luminance value is written as the luminance value Bright in the multi-display table 27A. . At the same time, the central processing unit 14 instructs the luminance control unit 17 on the luminance value Bright. The luminance control unit 17 controls the luminance of the display unit 16 and adjusts the luminance of the display unit 16 to the instructed luminance value Bright (step S104).

  In any of the display devices 2, since the value of the automatic brightness adjustment flag AutoBright in the multi-display table 27A is the same, the brightness of the screen is not adjusted or the brightness of the screen is adjusted for each display device 2. Become.

  Therefore, when the value of the enlargement mode Enl is set to “0”, the same entire image is displayed on the screen for each display device 2. Further, according to the value of the automatic brightness adjustment flag AutoBright, the screen brightness of each display device 2 is not adjusted, or the screen brightness is adjusted for each display device 2.

  If the enlargement mode Enl is set to any of “1” to “3” instead of “0” (“Yes” in step S101), the central processing unit 14 refers to the multi-display table 27A. Then, the value of the display position Pos is read out, and the video signal is cut out and extracted from all the video signals in the display memory 12 in accordance with the value of the enlargement mode Enl and the value of the display position Pos as described above. The enlarged video signal is subjected to enlargement processing, the extracted and enlarged video signal is output to the display unit 16, and the extracted and enlarged video is displayed on the screen of the display unit 16 (step S105).

  At this time, if the value of the enlargement mode Enl is “1”, a small multi-display screen 3S composed of four display devices 2a, 2b, 2e, and 2f as shown in FIG. All the images magnified twice in both vertical and horizontal directions are displayed on the screen 3S. If the value of the enlargement mode Enl is “2”, the display device 2a, 2b, 2c, 2e, 2f, 2g, 2i, 2j, and 2k as shown in FIG. A multi-display screen 3M is configured, and all images enlarged three times in length and width are displayed on the screen 3M. Further, if the value of the enlargement mode Enl is “3”, a large multi-display screen 3L composed of 16 display devices 2a to 2p as shown in FIG. All images magnified 4 times are displayed.

  Subsequently, the central processing unit 14 refers to the multi-display table 27A and determines whether the automatic brightness adjustment flag AutoBright is set to “0” or “1” (step S106). If the automatic brightness adjustment flag AutoBright is set to “0” (“No” in step S106), the process of FIG. 8 ends without adjusting the brightness of the screen of the display unit 16. In each display device 2, since the value of the automatic brightness adjustment flag AutoBright is the same, the brightness of the multi-display screen is not adjusted.

  If the automatic brightness adjustment flag AutoBright is set to “1” (“Yes” in step S106), the central processing unit 14 refers to the multi-display table 27A and the representative flag RepFlg is “0”. Whether “1” is set, that is, whether or not the own display device 2 is selected as a representative of each display device 2 constituting the multi-display screen is determined (steps S107 and S108).

  Any one of the display devices 2 constituting the multi-display screen is a representative, only the representative flag RepFlg of the representative display device 2 is set to “1”, and the representative flag RepFlg of the other display devices 2 is “0”. "Is set.

  If the representative flag RepFlg is set to “1” (“Yes” in step S108), the central processing unit 14 obtains the illuminance value around the screen of the display unit 16 detected by the sensor 18, and this illuminance Is written as the illuminance value Sensor in the multi-display table 27A, the luminance value corresponding to the illuminance value Sensor is read from the illuminance luminance table 27C, and this luminance value is written as the luminance value Bright in the multi-display table 27A. At the same time, the central processing unit 14 instructs the luminance control unit 17 on the luminance value Bright. The luminance control unit 17 controls the luminance of the display unit 16 and adjusts the luminance of the display unit 16 to the instructed luminance value Bright. Further, the central processing unit 14 transmits the brightness value Bright to another adjacent display device 2 through the serial communication unit 25 and the serial interface 26 (step S109).

  If the representative flag RepFlg is set to “0” (“No” in step S108), the central processing unit 14 waits for reception of the brightness value Bright through the serial interface 23 and the serial communication processing unit 24. When the brightness value Bright is received, the brightness value Bright is written as the brightness value Bright in the multi-display table 27A. Further, the central processing unit 14 controls the luminance of the display unit 16 through the luminance control unit 17 and adjusts the luminance of the display unit 16 to the luminance value Bright. Further, the central processing unit 14 transmits the brightness value Bright to the next adjacent display device 2 through the serial communication unit 25 and the serial interface 26 (step S110).

  Therefore, when a multi-display screen is used, the illuminance value around the screen of the display unit 16 is obtained by the representative display device 2, and the luminance value corresponding to the illuminance value is obtained. The luminance value is adjusted to the obtained luminance value, and the obtained luminance value is sequentially transferred to the other display devices 2, and the luminance of the screen of each other display device 2 is also set to the obtained luminance value. Adjusted. As a result, the brightness of the screens of the respective display devices 2 constituting the multi-display screen is made uniform, so that uneven brightness of the multi-display screen does not occur.

  FIG. 9 is a flowchart showing in detail the process of step S107 of FIG. 8, that is, the process for determining whether or not the display device 2 of the self is selected as a representative of each display device 2 constituting the multi-display screen. .

  In each display device 2, when any one of “1” to “3” is set as the value of the enlargement mode Enl of the multi-display table 27A, the representative corresponding to the value of the enlargement mode Enl from the display position representative table 27B. If the value of the position Dpos is read and the value of the representative position Dpos matches the value of the display position Pos of its own display device 2, the representative flag RepFlg is set to “1”, and the value of the representative position Dpos is If the value does not coincide with the value of the display position Pos of its own display device 2, the representative flag RepFlg is set to “0”.

  Specifically, if the enlargement mode Enl is “1” and the small multi-display screen 3S is selected, the central processing unit 14 displays the representative position corresponding to the enlargement mode Enl “1” from the display position representative table 27B. Dpos “0” is read out, and it is determined whether or not the representative position Dpos “0” matches the value of the display position Pos of its own display device 2 (step S201), and if it matches (“Yes” in step S201). ), The representative flag RepFlg is set to “1” (step S202). If they do not match (“No” in step S201), the representative flag RepFlg is set to “0” through the next steps S203 and 204 (step S202). Step S205). Specifically, in the display device 2a in the upper left of FIG. 5B, the display position Pos “0” matches the representative position Dpos “0”, so the representative flag RepFlg is set to “1”. In each of the display devices, the value of the display position Pos does not coincide with the representative position Dpos “0”, and the representative flag RepFlg is set to “0”.

  If the enlargement mode Enl is “2” and the middle multi-display screen 3M is selected (“No” in step S201), the central processing unit 14 reads the enlargement mode Enl “from the display position representative table 27B. The representative position Dpos “4” corresponding to “2” is read out, and it is determined whether or not the representative position Dpos “4” matches the value of the display position Pos of its own display device 2 (step S203). (“Yes” in step S203), the representative flag RepFlg is set to “1” (step S202), and if they do not match (“No” in step S203), the representative flag RepFlg is set to “0” through the next step S204. "(Step S205). Specifically, in the central display device 2f in FIG. 5C, the display position Pos “4” matches the representative position Dpos “4”, so the representative flag RepFlg is set to “1”. In each of the display devices, the value of the display position Pos does not coincide with the representative position Dpos “4”, and the representative flag RepFlg is set to “0”.

  If the enlargement mode Enl is “3” and the large multi-display screen 3L is selected (“No” in step S201, “No” in step S203), the central processing unit 14 displays the display position representative. The representative position Dpos “4” corresponding to the enlargement mode Enl “3” is read from the table 27B, and it is determined whether or not the representative position Dpos “4” matches the value of the display position Pos of its own display device 2 (step). If they match (“Yes” in step S204), the representative flag RepFlg is set to “1” (step S202). If they do not match (“No” in step S204), the representative flag RepFlg is set to “0”. "(Step S205). Specifically, in the display device 2f near the center of FIG. 5D, since the display position Pos “4” matches the representative position Dpos “4”, the representative flag RepFlg is set to “1”. In each of the other display devices, the value of the display position Pos does not coincide with the representative position Dpos “4”, and the representative flag RepFlg is set to “0”.

  As described above, when the value of the representative position Dpos corresponding to the value of the enlargement mode Enl is read for each display device 2 and the value of the representative position Dpos matches the value of the display position Pos of its own display device 2, The representative flag RepFlg is set to “1”.

  FIG. 10 is a flowchart showing in detail the process of step S109 of FIG. 8, that is, the process of setting and transmitting the brightness value Bright by the representative display device 2.

  The central processing unit 14 initializes the previous luminance value PreBright in the multi-display table 27A to “−1” (step S301), obtains the illuminance value around the screen of the display unit 16 detected by the sensor 18, and determines the illuminance value. The value is written as the illuminance value Sensor in the multi-display table 27A (step S302), the luminance value corresponding to the illuminance value Sensor is read from the illuminance luminance table 27C, and this luminance value is written as the luminance value Bright in the multi-display table 27A ( Step S303).

  Note that the initial value “−1” of the previous brightness value PreBright is a value that is impossible as an actual brightness value, and the previous brightness value PreBright is always updated when the brightness value Bright is first determined as described below. It is a value set to make it happen.

  Subsequently, when the luminance value Bright is set, the central processing unit 14 determines whether or not the luminance value Bright and the previous luminance value PreBright do not match (Step S304). At this time, since the initial value “−1” of the previous luminance value PreBright is a value that is impossible as an actual luminance value, the luminance value Bright and the previous luminance value PreBright do not match (“Yes” in step S304). ). In this case, the central processing unit 14 writes the luminance value Bright as the previous luminance value PreBright in the multi-display table 27A, and updates the previous luminance value PreBright (step S305). Then, the central processing unit 14 controls the luminance of the display unit 16 through the luminance control unit 17 and adjusts the luminance of the display unit 16 to the luminance value Bright. Furthermore, the central processing unit 14 transmits the brightness value Bright to another adjacent display device 2 (step S306).

  Thereafter, the central processing unit 14 determines whether or not the value of the enlargement mode Enl has been changed, that is, whether or not the multi-display screen has been changed (step S307). If there is a change (“Yes” in step S307). ), The process of FIG. 10 is terminated, and the process returns to step S101 of FIG.

  If there is no change in the multi-display screen (“No” in step S307), the process returns to step S302, the illuminance value Sensor corresponding to the detection output of the sensor 18 is obtained, and the luminance value Bright corresponding to the illuminance value Sensor is obtained. (Step S303).

  If the luminance value Bright matches the previous luminance value PreBright (“No” in step S304, the luminance value Bright has not changed, the luminance of the display unit 16 so far is maintained, and the process proceeds to step S307. Therefore, unless the multi-display screen is changed and the brightness value Bright does not change, steps S302, S303, S304, and S307 are repeated, and the brightness of the display unit 16 is maintained.

  If the luminance value Bright does not match the previous luminance value PreBright (“Yes” in step S304, the luminance value Bright has changed, the process proceeds to steps S305 and S306, where the luminance value Bright is set as the previous luminance value PreBright. The brightness value PreBright is written and the previous brightness value PreBright is updated, the brightness of the display unit 16 is adjusted to the brightness value Bright, and the brightness value Bright is transmitted to another adjacent display device 2. Therefore, the multi-display screen is changed. If the brightness value Bright changes, steps S305 and S306 are performed, the brightness of the display unit 16 is updated, and the updated brightness value is transmitted to another display device 2 adjacent thereto.

  As described above, the representative display device 2 sets or updates the brightness value Bright, and transmits the set or updated brightness value Bright to another display device 2.

  FIG. 11 is a flowchart showing in detail the process of step S110 of FIG. 8, that is, the process of setting and transmitting the brightness value Bright by the display device 2 that is not representative.

  The processing in FIG. 11 is performed by the display device 2 in which the display position Pos of the multi-display table 27A is set, that is, the display device 2 constituting the multi-display screen. In the other display device 2 that deviates from the multi-display screen, even if the brightness value Bright is received without performing the processing of FIG. 11, the brightness value Bright is merely transferred to the next display device 2. Do not write or set brightness.

  The central processing unit 14 waits for reception of the brightness value Bright (step S401). When the brightness value Bright is received (“Yes” in step S401), the central processing unit 14 sets this brightness value Bright as the brightness value Bright in the multi-display table 27A. The luminance of the display unit 16 is controlled through the writing and luminance control unit 17, and the luminance of the display unit 16 is adjusted to the luminance value Bright (step S402). Then, the central processing unit 14 transmits the brightness value Bright to the next adjacent display device 2 (step S403).

  Further, the central processing unit 14 determines whether or not the value of the enlargement mode Enl has been changed, that is, whether or not the multi-display screen has been changed (step S404), and if there is a change (“Yes” in step S404). 11 is terminated, and the process returns to step S101 in FIG.

  If there is no change in the multi-display screen (“No” in step S404), the process returns to step S401 and waits for reception of the brightness value Bright (step S401).

  If the brightness value Bright is not received (“No” in step S404), the brightness of the display unit 16 so far is maintained, and the process proceeds to step S404. Therefore, unless the multi-display screen is changed and the brightness value Bright does not change, steps S401 and S404 are repeated, and the brightness of the display unit 16 is maintained.

  If the brightness value Bright has been received (“Yes” in step S404), the brightness value Bright has changed, so the process proceeds to steps S402 and S403, and the brightness value Bright is written to the multi-display table 27A. Then, the luminance of the display unit 16 is controlled, the luminance of the display unit 16 is adjusted to this luminance value Bright, and the luminance value Bright is transmitted to the next display device 2 adjacent thereto.

  Thus, the display device 2 that is not representative receives and sets the brightness value Bright, and transmits this brightness value Bright to the other display devices 2. Accordingly, each display device 2 that is not representative can sequentially transmit and set the brightness value Bright.

  FIG. 12 is a flowchart showing in detail the process in step S303 of FIG. 10, that is, the process for setting the luminance value Bright corresponding to the illuminance value Sensor.

  In the representative display device 2, the central processing unit 14 refers to the illuminance luminance table 27C and determines whether the illuminance value Sensor in the multi-display table 27A is in the illuminance range “0” to “20” in the first stage. If the determination is made (step S501) and the illuminance value Sensor is in the illuminance range “0” to “20” in the first stage (“Yes” in step S501), the illuminance value table 27C changes to the first illuminance range. The corresponding luminance value “0” is read, and this luminance value “0” is written as the luminance value Bright in the multi-display table 27A (step S502).

  If the illuminance value Sensor is not within the illuminance range of the first stage (“No” in step S501), the central processing unit 14 refers to the illuminance luminance table 27C, and the illuminance value Sensor is the illuminance of the second stage. It is determined whether or not it is within the range “21” to “40” (step S503), and if the illuminance value Sensor is within the second stage illuminance range “21” to “40” (“ Yes ”), the luminance value“ 1 ”corresponding to the second-stage illuminance range is read from the illuminance luminance table 27C, and this luminance value“ 1 ”is written as the luminance value Bright in the multi-display table 27A (step S504). .

  Further, if the illuminance value Sensor is not in the second stage illuminance range (“No” in step S503), whether or not the illuminance value Sensor is in the third stage illuminance range “41” to “60”. Is determined (step S505), and if the illuminance value Sensor is within the third stage illuminance range ("Yes" in step S505), the luminance corresponding to the third stage illuminance range from the illuminance luminance table 27C. The value “2” is read out, and this luminance value “2” is written as the luminance value Bright in the multi-display table 27A (step S506).

  Thereafter, similarly, if the illuminance value Sensor is in the fourth-stage illuminance range “61” to “80” (“Yes” in step S507), the luminance value “3” corresponding to the fourth-stage illuminance range is set. ”Is set as the brightness value Bright (step S508), and if the illuminance value Sensor is in the illuminance range“ 81 ”to“ 100 ”of the fifth stage (“ Yes ”in step S509), the fifth stage The luminance value “4” corresponding to the illuminance range is set as the luminance value Bright (step S510), and if the illuminance value Sensor is not in the fifth illuminance range (“No” in step S509), Since the illuminance value Sensor exceeds “100”, the luminance value “5” corresponding to the illuminance range of the sixth stage is set as the luminance value Bright (step S511).

  As described above, the representative display device 2 sets the brightness value Bright corresponding to the illuminance value Sensor.

  In addition, this invention is not limited to the said embodiment, It can deform | transform variously. For example, the luminance value of the screen corresponding to the illuminance around the screen is obtained on the representative display device 2 side, and this luminance value is sequentially transferred from the representative display device 2 to another display device 2, but in FIG. As shown, each display device 2 is connected to an external computer P, the representative display device 2 is determined by the computer P, the representative display device 2 is instructed from the computer P, and the representative display device 2 displays the screen. The ambient illuminance is detected, the illuminance is transmitted to the computer P, the screen P corresponding to the illuminance around the screen is obtained on the computer P side, and the brightness value is transmitted from the computer P to each display device 2. Each display device 2 may set the brightness of each screen and the transmitted and received brightness values.

  The present invention includes not only a multi-display system and a display device, but also a multi-display method and a program executed by a computer to implement the multi-display method. The computer is, for example, the central processing unit 14 of the display device 2 or an external computer, and may be any device that can execute a program.

  In addition, the computer can implement the present invention by reading a program from a recording medium, receiving the program through a communication network, and executing the program. In a system composed of a plurality of computers and the Internet, a plurality of processes can be distributed to a plurality of terminals. Therefore, the program can be applied not only to a single terminal such as a computer but also to a system.

It is a block diagram which shows one Embodiment of the display apparatus of this invention. It is a figure which shows the multi-display system to which the display apparatus of FIG. 1 is applied. (A) is a figure which shows the example of a display of a single display apparatus screen, (b) is a figure which shows the example of a display of a small multi-display screen which consists of a total of four display apparatuses 2 each in length and width. It is a figure which shows the memory content of the multi display table in the internal memory part in the display apparatus of FIG. (A) is a diagram showing a single display device screen, (b) is a diagram showing a small multi-display screen composed of a total of four display devices each in two vertical and horizontal directions, and (c) is a total of three vertical and horizontal devices. It is a figure which shows the middle multi-display screen which consists of nine display apparatuses, and (d) is a figure which shows the large multi-display screen which consists of a total of 16 display apparatuses, 4 each in length and breadth. It is a figure which shows the memory content of the display position representative table in the internal memory part in the display apparatus of FIG. It is a figure which shows the memory content of the illumination intensity luminance table in the internal memory part in the display apparatus of FIG. It is a flowchart which shows the process sequence for adjusting the brightness | luminance of a multi-display screen. FIG. 9 is a flowchart showing in detail a process in step S107 of FIG. 8, that is, a process for determining whether or not the display device of its own is selected as a representative. FIG. 9 is a flowchart showing in detail the process of step S109 in FIG. 8, that is, the process of setting and transmitting the brightness value Bright by a representative display device. FIG. 9 is a flowchart showing in detail the processing of step S110 in FIG. 8, that is, the processing for setting and transmitting the brightness value Bright by a display device that is not representative. It is a flowchart which shows in detail the process of step S303 of FIG. 10, ie, the process for setting the luminance value Bright corresponding to the illuminance value Sensor. It is a block diagram which shows the other structure of a multi display system. It is a figure which illustrates a multi-display screen. It is a figure which illustrates the data table which matched the illumination intensity of a screen periphery, and the brightness | luminance of a screen.

Explanation of symbols

1 Multi-display system 2, 2a-2p Display device 3S Small multi-display screen 3M Medium multi-display screen 3L Large multi-display screen 11-1 to 11-N Video input terminal 12 Display memory 13-1 to 13-N Video output terminal 14 Central processing unit 15 Display processing unit 16 Display unit 17 Brightness control unit 18 Sensor 21 Remote control light receiving unit 22 Remote control operation processing unit 23, 26 Serial interface 24, 25 Serial communication unit 27 Internal storage unit 27A Multi display table 27A
27B Display position representative table 27C Illuminance luminance table

Claims (8)

In a display device that is arranged side by side with another display device and constitutes a multi-display screen with the other display device,
Illuminance detection means for detecting the illuminance around the display device of itself;
A brightness adjusting means for adjusting the brightness of the display device screen;
Data communication means for performing data communication with the other display device;
Reference determination means for determining whether or not the display device of the user is a reference;
When the reference determination unit determines that the display device is the reference, the luminance corresponding to the illuminance detected by the illuminance detection unit is obtained, and the obtained luminance is transmitted to another display device through the data communication unit. At the same time, the brightness adjusting means is controlled to adjust the brightness of the display device screen to the determined brightness, and when the reference determining means determines that the display device is not the reference, the data communication means is used. And a control means for receiving the brightness corresponding to the illuminance detected by the other display device, controlling the brightness adjusting means, and adjusting the brightness of the display device screen to the received brightness. Display device.   The reference determination unit compares the arrangement position of its own display device on a multi-display screen with the reference position of the reference display device, and if the arrangement position of its own display device matches the reference position, the display device of its own 2. The display device according to claim 1, wherein the display device is determined not to be a reference if the display device is determined to be a reference, and if the arrangement position of the display device does not match the reference position. In a multi-display system that forms a multi-display screen by a plurality of display devices arranged side by side,
Illuminance detection means provided in each of the display devices for detecting the illuminance around the display device,
A brightness adjusting means provided in each display device for adjusting the brightness of the display device screen;
Data communication means provided in each display device for performing data communication;
A reference determination unit that determines a display device serving as a reference among the display devices;
In the display device determined to be the reference by the reference determination unit, the luminance corresponding to the illuminance detected by the illuminance detection unit is obtained, and the obtained luminance is transmitted to another display device through the data communication unit to adjust the luminance. Controlling the means to adjust the brightness of the display device screen to the determined brightness,
The other display device receives the obtained luminance through a data communication unit and controls the luminance adjustment unit to adjust the luminance of the other display device screen to the received luminance. Display system.   The multi-display system according to claim 3, wherein the display device determined to be the reference by the reference determination unit obtains luminance corresponding to the illuminance detected by the illuminance detection unit using a computer. In a multi-display system that forms a multi-display screen by a plurality of display devices arranged side by side,
Illuminance detection means provided in each of the display devices for detecting the illuminance around the display device,
A brightness adjusting means provided in each display device for adjusting the brightness of the display device screen;
Data communication means provided in each display device for performing data communication;
Reference determination means for determining a display device as a reference among the display devices;
A luminance setting means for obtaining a luminance corresponding to the illuminance detected by the illuminance detection means of the display device determined to be the reference by the reference determination means;
Each display device receives the brightness obtained by the brightness setting means through the data communication means, and controls the brightness adjusting means to adjust the brightness of the display device screen to the received brightness. system.   6. The multi-display system according to claim 5, wherein the luminance setting means is a computer, and the luminance calculated by the computer is transmitted and received from the computer to each display device. In a multi-display method of configuring a multi-display screen by a plurality of display devices arranged side by side,
It is determined which of the display devices is a reference, obtains the luminance corresponding to the illuminance detected by the illuminance detection means of the display device determined to be the reference, and determines the luminance of each display device screen A multi-display method characterized by adjusting to a determined luminance.   A program executed by a computer to realize the multi-display method according to claim 7.

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