JP6432186B2 - Display device, display system, and display device control method - Google Patents

Description

  The present invention relates to a display device, a display system, and a display device control method.

  2. Description of the Related Art Conventionally, a multi-display system (display system) that displays a single image by combining divided images displayed by a plurality of display devices is known. Patent Document 1 discloses a multi-display system (display system) composed of a plurality of display devices, which includes wireless communication means on the side surface of each housing of the plurality of display devices. In this multi-display system, the housings of the display devices are combined so as to face each other on the side. Each display device specifies its own position in the entire combination based on the wireless communication result. Then, the display range to be displayed by the user is specified and displayed according to the own position. At this time, the own position is specified based on the position information transmitted from the facing destination and the side surface direction. In such a multi-display system, it is possible to reduce the initial setting effort.

JP 2011-257540 A

  However, in Patent Document 1, each display device (display device) performs wireless communication with another adjacent display device. For this reason, it is relatively easy to grasp the position of another display device adjacent in the vertical direction or the horizontal direction with respect to the reference display device, but exists in an oblique direction with respect to the reference display device. In order to grasp the position of a display device to be displayed or a display device that is not adjacent, complicated processing is required.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A display device according to this application example is a display device, and includes a display unit that displays an image, a first communication unit that wirelessly communicates with another display device, and wirelessly with the other display device. A second communication unit that communicates, and a communication control unit that controls the first communication unit and the second communication unit, wherein the communication control unit includes the first communication unit and the other communication unit. The other display on the display device based on the electric field strength of wireless communication performed with the display device and the electric field strength of wireless communication performed between the second communication unit and the other display device. The relative position of the device is specified.

  According to such a display device, the first communication unit and the second communication unit perform wireless communication with other display devices, respectively. The communication control unit adjusts the electric field strength of wireless communication performed between the first communication unit and another display device and the electric field strength of wireless communication performed between the second communication unit and the other display device. Based on this, the relative position of the other display device with respect to the display device is specified. Thereby, the display device can specify the relative position of the other display devices, and can grasp its own display area.

  Application Example 2 In the display device according to the application example, the display device includes a third communication unit that wirelessly communicates with the other display device, and a fourth communication unit that wirelessly communicates with the other display device. The communication control unit further includes an electric field strength of wireless communication performed between the third communication unit and the other display device, and between the fourth communication unit and the other display device. The relative position of the other display device with respect to the display device is specified based on the electric field strength of the wireless communication performed.

  According to such a display device, the third communication unit and the fourth communication unit are further provided. The first communication unit, the second communication unit, the third communication unit, and the fourth communication unit perform wireless communication with other display devices based on the control of the communication control unit. And the relative position of the other display apparatus with respect to the said display apparatus is specified based on the electric field strength of radio | wireless communication. Thereby, the display device can specify the relative position of the other display device in detail.

  Application Example 3 In the display device according to the application example, the first communication unit, the second communication unit, the third communication unit, and the fourth communication unit are a housing of the display device. The display unit is arranged on a first surface, a second surface, a third surface, and a fourth surface adjacent to a surface that performs display output.

  According to such a display device, the first communication unit, the second communication unit, the third communication unit, and the fourth communication unit are provided on the surface on which the display unit of the housing of the display device performs display output. Arranged on the adjacent first surface, second surface, third surface, and fourth surface. Thereby, based on the electric field strength of the wireless communication of the communication unit of the first surface, the second surface, the third surface, and the fourth surface, the display device details the relative positions of the other display devices. Can be identified.

  Application Example 4 In the display device according to the application example described above, the communication control unit switches between the first communication unit and the second communication unit to perform wireless communication with another display device. .

  According to such a display device, the communication control unit switches between the first communication unit and the second communication unit to perform wireless communication with other display devices. This makes it possible to calculate the difference between the electric field strength of the first communication unit and the electric field strength of the second communication unit, and to detect the positional relationship between the display device and another display device.

  Application Example 5 In the display device according to the application example, the communication control unit issues an instruction to the other display device, and sequentially switches a plurality of communication units included in the other display device. To do.

  According to such a display device, the communication control unit issues an instruction to another display device, and sequentially switches a plurality of communication units included in the other display device. Thereby, the said display apparatus can detect the electric field strength for every some communication part with which another display apparatus is provided.

  Application Example 6 In the display device according to the application example, the communication control unit includes an electric field strength of wireless communication performed between the first communication unit and the other display device, and the second communication. A display device characterized in that a relative position of the other display device is specified in accordance with a relative magnitude relationship between an electric field strength of wireless communication performed between the display unit and the other display device.

  According to such a display device, the communication control unit is configured such that the electric field strength of the wireless communication performed between the first communication unit and the other display device, and between the second communication unit and the other display device. The relative position of the other display device is specified in accordance with the relative magnitude (difference) with the electric field strength of the wireless communication performed in (1). Thereby, the display device can specify the relative position of the other display devices, and can grasp its own display area.

  Application Example 7 In the display device according to the application example described above, an arrangement for generating arrangement information representing a relative arrangement relationship between the display apparatus and the other display apparatus based on a relative position of the other display apparatus. An information generation unit, and a storage unit that stores the arrangement information generated by the arrangement information generation unit are further provided.

  According to such a display device, the arrangement information generation unit generates arrangement information representing a relative arrangement relationship between the display device and the other display device based on the relative position of the other display device. The storage unit stores arrangement information. Thereby, the display device can handle the positional relationship between itself and another display device as information.

  Application Example 8 In the display device according to the application example described above, the display device further includes an arrangement information transmission unit that transmits the arrangement information generated by the arrangement information generation unit to the other display device.

  According to such a display device, the arrangement information transmission unit transmits the arrangement information to another display device. Thereby, arrangement information can be shared by a plurality of display devices. And other display devices can grasp their own arrangement.

  Application Example 9 In the display device according to the application example described above, a pixel number storage unit that stores first display pixel number information indicating the number of display pixels of the display device, and a display pixel number of the other display device. The pixel number information receiving unit that receives the second display pixel number information from the other display device and the display pixel number of the entire image formed by arranging the display images of the display device and the other display device. A total display pixel number calculation unit that calculates total display pixel number information to be expressed based on the first display pixel number information, the second display pixel number information, and the arrangement information, To do.

  According to such a display device, the pixel number storage unit stores first display pixel number information representing the display pixel number of the display device. The pixel number information receiving unit receives second display pixel number information representing the display pixel number of another display device. The total display pixel number calculation unit obtains the total display pixel number information indicating the display pixel number of the entire image formed by arranging the display images of the display device and another display device, the first display pixel number information, 2 based on the number of display pixels and the arrangement information. Thereby, the display device can recognize the total display pixel number information of the image formed by arranging the display images.

  Application Example 10 In the display device according to the application example, the display device further includes a total pixel number storage unit that stores the arrangement information and the total display pixel number information, and the total pixel number storage unit is external to the display device. It is configured to be referable.

  According to such a display device, the total pixel number storage unit stores arrangement information and total display pixel number information. The total pixel number storage unit can be referred to from the outside. Thus, an external image supply device connected to the display device can supply image information to the display device with reference to the arrangement information and the total display pixel number information stored in the total pixel number storage unit. Become.

  Application Example 11 A display system according to this application example includes the display device according to the application example described above and the other display device.

  According to such a display system, the arrangement relationship of the display devices can be recognized in a mode in which the display devices are arranged side by side or stacked.

  Application Example 12 A display device control method according to this application example includes a display unit that displays an image, a first communication unit that wirelessly communicates with another display device, and a first communication unit that wirelessly communicates with the other display device. 2, a communication control unit that controls the first communication unit and the second communication unit, wherein the communication control unit includes the first communication unit. A first detection step of detecting an electric field strength of wireless communication performed between the second communication unit and the other display device, and the communication control unit performs between the second communication unit and the other display device. A second detection step for detecting the electric field strength of the wireless communication, and a relative position for specifying a relative position of the other display device with respect to the display device based on detection results of the first detection step and the second detection step. And a detecting step.

  According to such a control method of the display device, the display device can specify the relative position of the other display device, and can grasp its own display area.

  Further, in the case where the above-described display device, display system, and display device control method are constructed using a computer provided in the display device, the mode and the application example are for realizing the function. Or a recording medium on which the program is recorded so as to be readable by the computer. Recording media include flexible disk, HDD (Hard Disk Drive), CD-ROM (Compact Disk Read Only Memory), DVD (Digital Versatile Disk), Blu-ray (registered trademark) Disc, magneto-optical disk, nonvolatile memory card Various types of information that can be read by the computer, such as internal storage devices (semiconductor memories such as RAM (Random Access Memory) and ROM (Read Only Memory)) and external storage devices (USB (Universal Serial Bus) memory, etc.) Media can be used.

1 is a perspective view of a projector according to an embodiment. 1 is a block diagram showing a schematic configuration of a projector. The detailed block diagram of a radio | wireless communication part. 1 is a front view illustrating an aspect of a multi-projection system according to Embodiment 1. FIG. It is explanatory drawing of the arrangement | positioning information database which concerns on Example 1, (a) is explanatory drawing showing the initialized state, (b) is explanatory drawing showing a completion state. The flowchart showing the arrangement | positioning information generation process in a multiprojection system. The flowchart of a master projector process. It is explanatory drawing of the relative position detection of the multiprojection system which concerns on Example 1, (a) is a front view of a multiprojection system, (b) is a table | surface of the measurement result of an electric field strength. It is explanatory drawing showing the table for judging a relative position, (a) is a table which judges whether it is a vertical direction or a diagonal direction, (b) judges whether it is upward or downward in the case of a vertical direction. Table, (c) is a table for determining whether it is upward or downward in the oblique direction, (d) is a table for determining whether it is in the horizontal direction, (e) is a right direction in the case of the horizontal direction A table that determines whether the direction is left or right. The flowchart of a relative position detection process. The flowchart of a slave projector process. It is explanatory drawing of the multi-projection system which concerns on Example 2, (a) is a front view showing the aspect of a multi-projection system, (b) is a table | surface of the measurement result of an electric field strength. Explanatory drawing of the arrangement | positioning information database which concerns on Example 2. FIG. It is explanatory drawing of the multiprojection system which concerns on Example 3, (a) is a front view showing the aspect of a multiprojection system, (b) is a table | surface of the measurement result of an electric field strength. Explanatory drawing of the arrangement | positioning information database which concerns on Example 3. FIG. Explanatory drawing about the antenna used for a relative position detection.

(Embodiment)
Hereinafter, as an embodiment of a display device, a projector that modulates light emitted from a light source based on image information to form image light, and projects the image light on an external screen or the like, and such a projector are provided. A multi-projection system that performs multi-display using a plurality of units will be described with reference to the drawings.

FIG. 1 is a perspective view of a projector according to the present embodiment.
As shown in FIG. 1, the projector 100 is configured to include a housing 5 that houses the apparatus main body, and an upper surface 5 </ b> T of the housing 5 includes an operation panel 21 on which an input operation is performed by a user. Yes. Further, an upper antenna AT is disposed on the upper surface 5T. A left antenna AL is disposed on the left surface (left surface 5L) in the projection direction of the projector 100, a right antenna AR is disposed on the right surface (right surface 5R), and a lower antenna AB is disposed on the bottom surface (lower surface 5B). The upper surface 5T, the lower surface 5B, the left surface 5L, and the right surface 5R of the housing 5 correspond to a first surface, a second surface, a third surface, and a fourth surface.

  The upper antenna AT, the left antenna AL, the right antenna AR, and the lower antenna AB are antennas for wireless communication with other projectors (not shown in FIG. 1) that are other display devices. In the present embodiment, wireless communication between the projector 100 and other projectors is performed by Bluetooth (registered trademark). The upper antenna AT, the lower antenna AB, the left antenna AL, and the right antenna AR correspond to a first communication unit, a second communication unit, a third communication unit, and a fourth communication unit.

  The projection lens 13 is exposed on the front surface 5F of the housing 5, and an image based on the image information is projected from the projection lens 13 onto a front projection surface (not shown in FIG. 1). The front surface 5F of the housing 5 corresponds to a surface on which the display unit performs display output.

FIG. 2 is a block diagram illustrating a schematic configuration of the projector 100.
As shown in FIG. 2, the projector 100 includes an image projection unit 10 as a display unit, a control unit 20, an operation panel 21, a display attribute storage unit 22, an image signal input unit 30, an image processing unit 31, a wireless communication unit 40, An upper antenna AT, a left antenna AL, a right antenna AR, a lower antenna AB, and the like are provided, and these are housed or arranged inside the housing 5 or on the upper surface 5T, the left surface 5L, the right surface 5R, and the lower surface 5B.

  The image projection unit 10 includes a light source device 11 as a light source, three liquid crystal light valves 12R, 12G, and 12B as light modulation devices, a projection lens 13 as a projection optical system, a liquid crystal drive unit 14, and the like. The image projection unit 10 corresponds to a display unit. The image projection unit 10 modulates light emitted from the light source device 11 into image light using the liquid crystal light valves 12R, 12G, and 12B, and projects the image light from the projection lens 13. The image is displayed on the projection surface SC such as a screen.

  The light source device 11 includes a discharge-type light source lamp 11a made of an ultra-high pressure mercury lamp, a metal halide lamp, or the like, and a reflector 11b that reflects light emitted from the light source lamp 11a toward the liquid crystal light valves 12R, 12G, and 12B. Has been. The light emitted from the light source device 11 is converted into light having a substantially uniform luminance distribution by an integrator optical system (not shown), and red (R), green (G), which are the three primary colors of light by a color separation optical system (not shown), After being separated into blue (B) color light components, they are incident on the liquid crystal light valves 12R, 12G, and 12B, respectively.

  The liquid crystal light valves 12R, 12G, and 12B are configured by a liquid crystal panel in which liquid crystal is sealed between a pair of transparent substrates. The liquid crystal light valves 12R, 12G, and 12B include a rectangular pixel region in which a plurality of pixels (not shown) are arranged in a matrix, and a driving voltage can be applied to the liquid crystal for each pixel. Yes. When the liquid crystal driving unit 14 applies a driving voltage corresponding to the input image information to each pixel, each pixel is set to a light transmittance corresponding to the image information. For this reason, the light emitted from the light source device 11 is modulated by transmitting through the pixel regions of the liquid crystal light valves 12R, 12G, and 12B, and image light corresponding to image information is formed for each color light. The formed image light of each color is synthesized for each pixel by a color synthesis optical system (not shown) to become color image light, and then enlarged and projected by the projection lens 13.

  The control unit 20 includes a CPU (Central Processing Unit), a RAM used for temporary storage of various data, a non-volatile ROM, and the like, and the CPU operates according to a control program stored in the ROM so that the projector 100 operations are centrally controlled.

  The operation panel 21 includes a plurality of operation keys for the user to give various instructions to the projector 100. The operation keys provided in the operation panel 21 of the present embodiment include a power key for switching on / off the power, an input switching key for switching an input image signal, and a menu key for displaying menu images for various settings. Direction keys used for selecting items in the menu image, a decision key for confirming the selected item, and when using the projector 100 as a multi-projection system, other projectors are searched to generate arrangement information. There are multi-projection keys and so on.

  When the user operates various operation keys on the operation panel 21, the operation panel 21 receives this operation and outputs a control signal corresponding to the operated operation key to the control unit 20. When a control signal is input from the operation panel 21, the control unit 20 performs processing based on the input control signal and controls the operation of the projector 100. Instead of the operation panel 21 or together with the operation panel 21, a remote controller (remote controller) (not shown) capable of remote operation may be used as the operation receiving unit. In this case, the remote controller transmits an operation signal such as an infrared ray corresponding to the operation content of the user, and a remote control signal receiving unit (not shown) receives this and transmits it to the control unit 20.

  The display attribute storage unit 22 includes a nonvolatile memory, and stores display attribute information corresponding to EDID (Extended Display Identification Data). Specifically, when the projector 100 is incorporated in a multi-projection system, total display pixel number information indicating the total number of pixels that can be displayed as the multi-projection system, and an arrangement that indicates the relative arrangement relationship of each projector Information, display pixel number information indicating the display pixel number of the projector 100, and the like are stored. The display attribute storage unit 22 at this time corresponds to a total pixel number storage unit and a pixel number storage unit. In addition, when the projector 100 is used alone, information on the number of display pixels of the projector 100 and the like are stored.

  The control unit 20 performs writing to the display attribute storage unit 22. In order to supply an image signal to the projector 100, an external image supply device (not shown) connected to the projector 100 via an image cable (not shown) receives a display attribute storage unit via the image cable. It is possible to read (acquire) information from 22. Specifically, when the image cable is not connected and is connected to the projector 100, the image supply device acquires display attribute information from the display attribute storage unit 22 of the projector 100 via the image cable. It is a mechanism. Since the image supply device and the projector 100 have such a mechanism, on the projector 100 side, the image cable is brought into a state equivalent to a state in which the image cable is not connected, and then returned to the connected state. It is possible to cause the supply device to re-acquire display attribute information.

  The image signal input unit 30 includes a plurality of input terminals, and various types of image signals are input to these input terminals from an external image supply device such as a video playback device or a personal computer. The image signal input unit 30 outputs image information based on the input image signal to the image processing unit 31. The image signal input unit 30 outputs the input image signal from the image signal output terminal MO. When the projector 100 is used by being incorporated in a multi-projection system, the image signal output from the image signal output terminal MO of the projector 100 is input to another projector.

  The image processing unit 31 defines the image information input from the image signal input unit 30 as image information representing the gradation of each pixel of the liquid crystal light valves 12R, 12G, and 12B, that is, a drive voltage applied to each pixel. Convert to image information. Further, the image processing unit 31 performs image processing based on an instruction from the control unit 20. Here, image processing refers to image scaling, trapezoidal distortion correction, or image display status (for example, brightness, contrast, synchronization, tracking, color depth, hue, etc.) for image information. Indicates that adjustments are to be made. The image processing unit 31 can also superimpose an OSD (On Screen Display) image such as a menu image on the input image. Image information that has been subjected to image processing by the image processing unit 31 is output to the liquid crystal driving unit 14.

  The liquid crystal drive unit 14 drives the liquid crystal light valves 12R, 12G, and 12B according to the image information input from the image processing unit 31. Thereby, the light emitted from the light source device 11 is modulated according to the image information by the liquid crystal light valves 12R, 12G, and 12B and projected from the projection lens 13.

  The wireless communication unit 40 performs wireless communication with other projectors based on instructions from the control unit 20. Bluetooth is used as a wireless communication standard between the wireless communication unit 40 and another projector. The wireless communication unit 40 performs transmission / reception with other projectors via the upper antenna AT, the left antenna AL, the right antenna AR, and the lower antenna AB. The wireless communication unit 40 transmits and receives control signals (such as various commands) to and from other projectors. The wireless communication unit 40 can detect the signal strength of the received control signal. The wireless communication unit 40 and the control unit 20 correspond to a communication control unit.

FIG. 3 is a detailed block diagram of the wireless communication unit 40.
As shown in FIG. 3, the wireless communication unit 40 includes a baseband processing unit 401, an RF modulation / demodulation unit 402, an RF switch 403, an AD conversion unit 404, and the like.

  The RF switch 403 switches the four antennas based on the RF switch control signal sent from the baseband processing unit 401. The RF modulation / demodulation unit 402 and the baseband processing unit 401 have a general configuration and enable bidirectional wireless communication. The RF modulation / demodulation unit 402 outputs the received RF signal strength to the AD conversion unit 404 as an RSSI (Received Signal Strength Indication) signal. The AD conversion unit 404 digitizes the input RSSI signal and outputs it to the baseband processing unit 401. The control unit 20 can read out the RSSI level (hereinafter referred to as “electric field strength”) from the baseband processing unit 401.

  Next, processing for realizing a multi-projection system using the projector 100 will be described using an embodiment.

Example 1
First, a multi-projection system in which two projectors are stacked vertically (up and down) will be described.
FIG. 4 is a front view illustrating an aspect of the multi-projection system according to the first embodiment.

  As shown in FIG. 4, the multi-projection system 1 includes a projector 100 and a projector 101 that are stacked. In the present embodiment, the configuration of the projector 101 is the same as that of the projector 100. Here, in the projector 100, the antenna codes are the upper antenna 100AT, the left antenna 100AL, the right antenna 100AR, and the lower antenna 100AB. In the projector 101, the upper antenna 101AT, the left antenna 101AL, the right antenna 101AR, and the lower antenna It is assumed that the antenna 101AB.

  In the multi-projection system 1 arranged in this way, images can be projected side by side. For example, if the display pixel numbers of the projector 100 and the projector 101 are 1920 × 1080 pixels, the multi-projection system 1 can project an image having a total display pixel number equivalent to 1920 × 2160 pixels. Specifically, the projector 100 can take charge of the projection of 1920 × 1080 pixels on the upper side of the projection image, and the projector 101 can take charge of the projection of 1920 × 1080 pixels on the lower side of the projection image.

  An image signal output from an external image supply device (not shown) is input to the image signal input unit 30 of the projector 100. The image output terminal MO of the projector 100 and the image input terminal of the image signal input unit 30 of the projector 101 are connected via an image cable (not shown). As a result, the image signal output from the projector 100 is input to the image signal input unit 30 of the projector 101.

In the multi-projection system 1, when a multi-projection key provided on the operation panel 21 of the projector 100 is pressed, the projector 100 starts searching for another projector constituting the multi-projection system 1 together with the projector 100 as a master projector. In order to realize the multi-projection system 1, the projector 100 generates an arrangement information database representing a relative arrangement relationship with other projectors.
FIG. 5 is an explanatory diagram of an arrangement information database according to the first embodiment, (a) is an explanatory diagram showing an initialized state, and (b) is an explanatory diagram showing a completed state.

  The arrangement information database DB (DB0, DB1) is a database stored in a writable nonvolatile memory or a volatile memory provided in the control unit 20. This memory corresponds to a storage unit. When “arrangement information generation processing in a multi-projection system” described later is executed, the arrangement information database is initialized to an initialized state, and information such as a relative position is set to a completed state. FIG. 5A shows the arrangement information database DB0 in the initialized state, and FIG. 5B shows the arrangement information database DB1 in the completed state.

  In the arrangement information database DB (DB0, DB1) of the present embodiment, two projectors are registered, and the multi-projection system 1 is constructed by the projector ID0 and the projector ID1. At this time, the first projector ID0 is a master projector, and the projector ID1 in the second and subsequent rows is a slave projector. If there are other slave projectors, the number of rows in the arrangement information database DB is added, such as projector ID2, ID3,. The arrangement information database DB stores information on the number of display pixels and relative positions for each projector ID.

  The number of display pixels represents the number of pixels that can be displayed by each projector. When the arrangement information database DB is initialized, information on the number of display pixels is stored, and becomes the arrangement information database DB0. The relative position represents the arrangement coordinates of the slave projector ID1 (ID2, ID3,...), Where the arrangement coordinates of the master projector ID0 is (x, y) = (0, 0). The x direction of the arrangement coordinates represents the left-right direction. When it is plus (+), it represents the right side toward the projection surface SC, and when it is minus (−), it represents the left side toward the projection surface SC. The y direction of the arrangement coordinates represents the vertical direction. When it is plus (+), it represents the upper side, and when it is minus (−), it represents the lower side. “Left side” and “right side” represent the left side and the right side when viewed from the rear of the projector 100.

  In this embodiment, the arrangement coordinates of the slave projector ID1 are (x, y) = (0, −1), which indicates that the slave projector ID1 is arranged below the master projector ID0. That is, the master projector ID0 is placed on the slave projector ID1.

  Thus, the arrangement information database DB can represent the arrangement state of the master projector ID0 and the plurality of slave projectors. Here, “ID0” and “ID1” stored in the projector ID are identification information assigned to identify individual projectors, and are held in, for example, the ROM of the control unit 20. As the identification information, information unique to each projector such as a MAC address can be used.

Next, a process in which the projector 100 searches for other projectors constituting the multi-projection system and generates the arrangement information database DB (arrangement information generation process) will be described.
FIG. 6 is a flowchart showing an arrangement information generation process in the multi-projection system of this embodiment.

  The control unit 20 of the projector 100 determines whether or not the multi-projection key provided on the operation panel 21 has been pressed (step S101). If the multi-projection key is pressed (step S101: YES), the control unit 20 recognizes that the projector 100 itself is a master projector, and executes a master projector process (subroutine) (step S102). When the master projector process ends, the process returns to step S101.

  If the multi-projection key has not been pressed (step S101: NO), the control unit 20 determines whether or not the wireless communication unit 40 has received a SEARCH command for searching for a slave projector (step S103). If the SEARCH command has been received (step S103: YES), the control unit 20 recognizes that the projector 100 itself is a slave projector, and executes slave projector processing (subroutine) (step S104). When the slave projector process ends, the process returns to step S101.

  If the SEARCH command has not been received (step S103: NO), the process returns to step S101.

Next, master projector processing (subroutine) will be described.
FIG. 7 is a flowchart of the master projector process.

  The control unit 20 instructs the wireless communication unit 40 to switch the antenna used by the master projector ID0 itself to the upper antenna AT (step S201). The control unit 20 instructs the wireless communication unit 40 to transmit a SEARCH command to other projectors (step S202). The SEARCH command is a command for searching for the presence or absence of a slave projector. In the first embodiment, the SEARCH command is transmitted to the projector 101.

  Then, the control unit 20 determines whether or not the wireless communication unit 40 has received a RESP (abbreviation of RESPONSE) command (step S203). The RESP command is a command sent as a response from the projector that has received the SEARCH command. The projector that has transmitted the RESP command in response to the SEARCH command becomes the slave projector IDx.

  When the RESP command is not received (step S203: NO), the control unit 20 of the projector 100 determines that the slave projector is not connected, and ends (returns) the master projector process.

  When the RESP command is received (step S203: YES), the control unit 20 issues an instruction to the wireless communication unit 40 to generate each slave projector IDx and a wireless link (step S204). The wireless communication unit 40 receives identification information (ID), which is each attribute information, information on the number of display pixels, and the like from the slave projector IDx, and notifies the control unit 20 (step S205). The wireless communication unit 40 and the control unit 20 that receive information on the number of display pixels correspond to a pixel number information receiving unit.

  The control unit 20 initializes the arrangement information database DB based on the attribute information received from each slave projector (step S206). Specifically, the identification information (ID) and the information on the number of display pixels are stored in the arrangement information database DB0 for the master projector ID0 and all the slave projectors IDx that have received the RESP command. In the first embodiment, the projector 101 is recognized as the slave projector ID1.

  The control unit 20 instructs the wireless communication unit 40 to transmit an upper antenna switching command to the slave projector IDx (ID1 in the present embodiment) (step S207). Here, the upper antenna switching command is a command for switching the antenna used by the wireless communication unit 40 of the slave projector IDx to the upper antenna AT. Similarly, a left antenna switching command to be described later is a command for switching the antenna used by the wireless communication unit 40 of the slave projector IDx to the left antenna AL. The right antenna switching command is a command for switching the antenna used by the wireless communication unit 40 of the slave projector IDx to the right antenna AR. The lower antenna switching command is a command for switching the antenna used by the wireless communication unit 40 of the slave projector IDx to the lower antenna AB.

  After transmitting the upper antenna switching command to the slave projector IDx, the control unit 20 instructs the wireless communication unit 40 to measure the electric field strength in wireless communication with the upper antenna AT of the slave projector IDx (step S208). At this time, as described above, the upper antenna AT is selected in the master projector ID0. The value of the electric field strength measured by the wireless communication unit 40 is notified to the control unit 20.

  Next, the control unit 20 instructs the wireless communication unit 40 to transmit a left antenna switching command to the slave projector IDx (step S209). Then, the control unit 20 instructs the wireless communication unit 40 to measure the electric field strength in wireless communication with the left antenna AL of the slave projector IDx (step S210). The measured electric field strength value is notified to the control unit 20.

  Next, the control unit 20 instructs the wireless communication unit 40 to transmit a right antenna switching command to the slave projector IDx (step S211). Then, the control unit 20 instructs the wireless communication unit 40 to measure the electric field strength in wireless communication with the right antenna AR of the slave projector IDx (step S212). The measured electric field strength value is notified to the control unit 20.

  Next, the control unit 20 instructs the wireless communication unit 40 to transmit a lower antenna switching command to the slave projector IDx (step S213). Then, the control unit 20 instructs the wireless communication unit 40 to measure the electric field strength in the wireless communication with the lower antenna AB of the slave projector IDx (step S214). The measured electric field strength value is notified to the control unit 20.

  The control unit 20 instructs the wireless communication unit 40 to switch the antenna used by the master projector ID0 itself from the upper antenna AT to the left antenna AL (step S215).

  The control unit 20 instructs the wireless communication unit 40 to transmit an upper antenna switching command to the slave projector IDx (step S216). Then, the control unit 20 instructs the wireless communication unit 40 to measure the electric field strength in the wireless communication with the upper antenna AT of the slave projector IDx (step S217). The measured electric field strength value is notified to the control unit 20.

  Next, the control unit 20 instructs the wireless communication unit 40 to transmit a left antenna switching command to the slave projector IDx (step S218). The control unit 20 then instructs the wireless communication unit 40 to measure the electric field strength in wireless communication with the left antenna AL of the slave projector IDx (step S219). The measured electric field strength value is notified to the control unit 20.

  Next, the control unit 20 instructs the wireless communication unit 40 to transmit a right antenna switching command to the slave projector IDx (step S220). Then, the control unit 20 instructs the wireless communication unit 40 to measure the electric field strength in the wireless communication with the right antenna AR of the slave projector IDx (step S221). The measured electric field strength value is notified to the control unit 20.

  Next, the control unit 20 instructs the wireless communication unit 40 to transmit a lower antenna switching command to the slave projector IDx (step S222). Then, the control unit 20 instructs the wireless communication unit 40 to measure the electric field strength in the wireless communication with the lower antenna AB of the slave projector IDx (step S223). The measured electric field strength value is notified to the control unit 20.

  The control unit 20 instructs the wireless communication unit 40 to switch the antenna used by the master projector ID0 itself from the left antenna AL to the right antenna AR (step S224).

  The control unit 20 instructs the wireless communication unit 40 to transmit an upper antenna switching command to the slave projector IDx (step S225). Then, the control unit 20 instructs the wireless communication unit 40 to measure the electric field strength in the wireless communication with the upper antenna AT of the slave projector IDx (step S226). The measured electric field strength value is notified to the control unit 20.

  Next, the control unit 20 instructs the wireless communication unit 40 to transmit a left antenna switching command to the slave projector IDx (step S227). Then, the control unit 20 instructs the wireless communication unit 40 to measure the electric field strength in wireless communication with the left antenna AL of the slave projector IDx (step S228). The measured electric field strength value is notified to the control unit 20.

  Next, the control unit 20 instructs the wireless communication unit 40 to transmit a right antenna switching command to the slave projector IDx (step S229). Then, the control unit 20 instructs the wireless communication unit 40 to measure the electric field strength in the wireless communication with the right antenna AR of the slave projector IDx (step S230). The measured electric field strength value is notified to the control unit 20.

  Next, the control unit 20 instructs the wireless communication unit 40 to transmit a lower antenna switching command to the slave projector IDx (step S231). Then, the control unit 20 instructs the wireless communication unit 40 to measure the electric field strength in wireless communication with the lower antenna AB of the slave projector IDx (step S232). The measured electric field strength value is notified to the control unit 20.

  The control unit 20 instructs the wireless communication unit 40 to switch the antenna used by the master projector ID0 itself from the right antenna AR to the lower antenna AB (step S233).

  The control unit 20 instructs the wireless communication unit 40 to transmit an upper antenna switching command to the slave projector IDx (step S234). Then, the control unit 20 instructs the wireless communication unit 40 to measure the electric field strength in the wireless communication with the upper antenna AT of the slave projector IDx (step S235). The measured electric field strength value is notified to the control unit 20.

  Next, the control unit 20 instructs the wireless communication unit 40 to transmit a left antenna switching command to the slave projector IDx (step S236). Then, the control unit 20 instructs the wireless communication unit 40 to measure the electric field strength in the wireless communication with the left antenna AL of the slave projector IDx (step S237). The measured electric field strength value is notified to the control unit 20.

  Next, the control unit 20 instructs the wireless communication unit 40 to transmit a right antenna switching command to the slave projector IDx (step S238). The control unit 20 then instructs the wireless communication unit 40 to measure the electric field strength in wireless communication with the right antenna AR of the slave projector IDx (step S239). The measured electric field strength value is notified to the control unit 20.

  Next, the control unit 20 instructs the wireless communication unit 40 to transmit a lower antenna switching command to the slave projector IDx (step S240). Then, the control unit 20 instructs the wireless communication unit 40 to measure the electric field strength in the wireless communication with the lower antenna AB of the slave projector IDx (step S241). The measured electric field strength value is notified to the control unit 20.

  The control unit 20 instructs the wireless communication unit 40 to switch the antenna used by the master projector ID0 itself from the lower antenna AB to the upper antenna AT (step S242).

  The control unit 20 determines whether or not the measurement of the electric field strength has been completed for all the slave projector IDs stored in the arrangement information database DB (step S243). If the measurement of the electric field intensity has not been completed for all the slave projector IDx (step S243: NO), the process proceeds to step S207, and the electric field intensity is measured while switching the antenna for the next slave projector IDx.

  If the measurement of the electric field strength has been completed for all the slave projector IDx (step S243: YES), the control unit 20 detects the relative position of the slave projector IDx with respect to the master projector ID0 (step S244). The detection of the relative position of the slave projector IDx will be described later.

  When the relative positions of all the slave projector IDs are detected, the control unit 20 updates the arrangement information database DB (step S245). That is, the arrangement information database DB (DB1) is completed according to the relative position of each slave projector IDx (see FIG. 5B). Thus, the control unit 20 that updates and completes the arrangement information database DB corresponds to the arrangement information generation unit.

  The control unit 20 instructs the wireless communication unit 40 to transmit the completed arrangement information database DB (DB1) to each slave projector IDx (step S246). The control unit 20 and the wireless communication unit 40 at this time correspond to an arrangement information transmission unit.

  Based on the display pixel number information of the projector 100 stored in the arrangement information database DB (DB1) and the display attribute storage unit 22, the control unit 20 is configured by the master projector ID0 and all slave projector IDx. Display pixel number information is calculated (step S247). Specifically, the number of display pixels (total display pixel number information) of the entire image formed by arranging the projection images of the master projector ID0 and all the slave projectors IDx according to the arrangement information is calculated. The control unit 20 at this time corresponds to a total display pixel number calculation unit. Then, the control unit 20 stores the total display pixel number information in the display attribute storage unit 22 (step S248). Then, the master projector process (subroutine) is ended (returned).

Here, the relative position detection of the slave projector IDx performed by the master projector ID0 will be described.
FIG. 8 is an explanatory diagram of relative position detection of the multi-projection system 1 according to the first embodiment, (a) is a front view of the multi-projection system 1, and (b) is a table of measurement results of electric field strength. It is.

  In the field strength measurement result table H1 in FIG. 8B, items indicating each antenna used by the master projector ID0 are shown on the left side, and the field strength measured for each antenna of the slave projector ID1 is shown on the right side. Is represented. This electric field strength measurement result table H1 is stored in the control unit 20 of the master projector ID0.

  When the upper antenna of the master projector ID0 measures the electric field strength, the electric field strength of the upper antenna of the slave projector ID1 is “ETT”, the electric field strength of the left antenna of the slave projector ID1 is “ETL”, and the right antenna of the slave projector ID1 Is represented as “ETR”, and the field strength of the lower antenna of the slave projector ID1 is represented as “ETB”.

  When the left antenna of the master projector ID0 measures the electric field strength, the electric field strength of the upper antenna of the slave projector ID1 is “ELT”, the electric field strength of the left antenna of the slave projector ID1 is “ELL”, and the slave projector ID1 The electric field strength of the right antenna is represented as “ELR”, and the electric field strength of the lower antenna of the slave projector ID1 is represented as “ELB”.

  Further, when the right antenna of the master projector ID0 measures the electric field strength, the electric field strength of the upper antenna of the slave projector ID1 is “ERT”, the electric field strength of the left antenna of the slave projector ID1 is “ERL”, and the slave projector ID1 The electric field strength of the right antenna is represented as “ERR”, and the electric field strength of the lower antenna of the slave projector ID1 is represented as “ERR”.

  When the lower antenna of the master projector ID0 measures the electric field strength, the electric field strength of the upper antenna of the slave projector ID1 is “EBT”, the electric field strength of the left antenna of the slave projector ID1 is “EBL”, and the right antenna of the slave projector ID1 Is represented as “EBR”, and the field strength of the lower antenna of the slave projector ID1 is represented as “EBB”. The numerical values in the electric field strength measurement result table H1 are sample values.

Then, the master projector ID0 determines the relative position using the determination result as shown in FIG.
FIG. 9 is an explanatory diagram showing a table for determining the relative position. (A) is a table for determining whether the vertical direction or the diagonal direction, and (b) is the upward direction in the vertical direction. (C) is a table for determining whether it is an upward direction or a downward direction in an oblique direction, (d) is a table for determining whether it is a horizontal direction, (E) is a table for determining whether the direction is rightward or leftward in the horizontal direction. These determination tables are stored in the control unit 20.

  As shown in the determination table T1 in FIG. 9A, in the case of “ETL≈ETR” and “EBL≈EBR”, the slave projector IDx (ID1) is arranged in the vertical direction with respect to the master projector ID0. Judge. When “ETL> ETR” and “EBL> EBR”, it is determined that the slave projector IDx (ID1) is arranged obliquely to the right with respect to the master projector ID0. When “ETL <ETR” and “EBL <EBR”, it is determined that the slave projector IDx (ID1) is arranged obliquely to the left with respect to the master projector ID0.

  When it is determined in the determination table T1 in FIG. 9A that the vertical direction is used, the determination table T2 in FIG. 9B is used. If “ETL> EBL”, the vertical direction is satisfied, and “ETL < If it is “EBL”, it is determined to be the vertically downward direction.

  If it is determined in the determination table T1 in FIG. 9A that the right diagonal direction or the left diagonal direction, the determination table T3 in FIG. 9C is used. If “ETT> ETB”, the diagonally downward direction is satisfied. If “ETT <ETB”, it is determined that the direction is obliquely upward.

  As shown in the determination table T4 in FIG. 9D, in the case of “ELT≈ELB” and “ERT≈ERB”, the slave projector IDx (ID1) is arranged in the horizontal direction with respect to the master projector ID0. Judge.

  If it is determined in the determination table T4 in FIG. 9D that the horizontal direction is used, the determination table T5 in FIG. 9E is used. If it is “ELT”, it is determined to be the left lateral direction. Note that “right” in FIG. 9 corresponds to the R direction (left direction in the drawing) in FIG. 8 (and FIGS. 12 and 14 described later). Further, “left” in FIG. 9 corresponds to the L direction (right direction on the paper surface) in FIG. 8 (and FIGS. 12 and 14 described later).

Here, the determination of the relative position shown in FIG. 9 will be described as a relative position detection process using a flowchart.
FIG. 10 is a flowchart of the relative position detection process.
As shown in FIG. 10, the master projector ID0 detects the relative position of the slave projector IDx (ID1) using the measurement result of the electric field intensity with the slave projector IDx (ID1).

  Based on the measurement result of the electric field strength, the control unit 20 of the master projector ID0 determines whether the slave projector IDx is arranged in the vertical direction using the determination table T1 (step S301). When arranged in the vertical direction (step S301: YES), the control unit 20 determines whether it is arranged in the vertical downward direction using the determination table T2 (step S302). If it is arranged in the vertically downward direction (step S302: YES), the control unit 20 determines that the relative position of the slave projector IDx is the vertically downward direction (step S303). Then, the relative position detection process of the slave projector IDx is ended.

  If not arranged vertically (step S302: NO), the control unit 20 determines that the relative position of the slave projector IDx is the vertically upward direction (step S304). Then, the relative position detection process of the slave projector IDx is ended.

  When not arrange | positioned in the vertical direction (step S301: NO), the control part 20 judges whether it has arrange | positioned in the diagonally right direction (step S305). If it is arranged in the diagonally right direction (step S305: YES), it is determined whether it is arranged in the diagonally downward direction using the determination table T3 (step S306). If it is arranged diagonally downward (step S306: YES), the control unit 20 determines that the relative position of the slave projector IDx is diagonally downward to the right (step S307). Then, the relative position detection process of the slave projector IDx is ended.

  If it is not arranged diagonally downward (step S306: NO), the control unit 20 determines that the relative position of the slave projector IDx is diagonally right upward (step S308). Then, the relative position detection process of the slave projector IDx is ended.

  When not arrange | positioned in the diagonally right direction (step S305: NO), the control part 20 judges whether it is arrange | positioned in the diagonally left direction (step S309). When it is arranged in the diagonally left direction (step S309: YES), it is determined whether it is arranged in the diagonally downward direction using the determination table T3 (step S310). If it is arranged diagonally downward (step S310: YES), the control unit 20 determines that the relative position of the slave projector IDx is diagonally downward left (step S311). Then, the relative position detection process of the slave projector IDx is ended.

  If it is not arranged diagonally downward (step S310: NO), the control unit 20 determines that the relative position of the slave projector IDx is diagonally upward left (step S312). Then, the relative position detection process of the slave projector IDx is ended.

  When not arrange | positioned in the left diagonal direction (step S309: NO), the control part 20 judges whether it has arrange | positioned in the horizontal direction using judgment table T4 (step S313). If it is arranged in the horizontal direction (step S313: YES), it is determined whether or not it is arranged in the right horizontal direction using the determination table T5 (step S314). If it is arranged in the right lateral direction (step S314: YES), the control unit 20 determines that the relative position of the slave projector IDx is the right lateral direction (step S315). Then, the relative position detection process of the slave projector IDx is ended.

  If it is not arranged in the right lateral direction (step S314: NO), the control unit 20 determines that the relative position of the slave projector IDx is the left lateral direction (step S316). Then, the relative position detection process of the slave projector IDx is ended. If it is not arranged in the horizontal direction (step S313: NO), the relative position detection of the slave projector IDx is made impossible and the process ends.

Next, slave projector processing (subroutine) will be described. The configuration of the projector 101 that is the slave projector IDx in the first embodiment is the same as the configuration of the projector 100 that is the master projector ID0, as described above. Therefore, the same code | symbol is used for the same component. Also, illustration is omitted.
FIG. 11 is a flowchart of slave projector processing.

  The control unit 20 of the slave projector IDx transmits a RESP command to the master projector ID0 that transmitted the SEARCH command via the wireless communication unit 40 (step S401). The control unit 20 instructs the wireless communication unit 40 to generate a wireless link with the master projector ID0 (step S402). The control unit 20 transmits attribute information (identification information (ID), information on the number of display pixels, etc.) of the slave projector IDx (ID1) to the master projector ID0 via the wireless communication unit 40 (step S403).

  Next, the control unit 20 determines whether an antenna switching command has been received via the wireless communication unit 40 (step S404). When the antenna switching command is received (step S404: YES), the control unit 20 instructs the wireless communication unit 40 to switch to the designated antenna (step S405). Then, the process returns to step S404.

  When the antenna switching command has not been received (step S404: NO), the control unit 20 determines whether the arrangement information database DB (DB1) has been received as an information command via the wireless communication unit 40 (step S406). ). If the arrangement information database DB (DB1) has not been received (step S406: NO), the process returns to step S404.

  When the arrangement information database DB (DB1) is received as an information command (step S406: YES), the control unit 20 stores the arrangement information database DB (DB1) (step S407). Then, the slave projector process (subroutine) is ended (returned).

  By performing the processing as described above, the multi-projection system 1 according to the first embodiment uses the determination table T1 and the determination table T2 (in other words, the electric field strengths “ETL” and “ETR”, “EBL”, and “EBR”). Thus, it can be determined that the relative position of the slave projector ID1 is the vertical downward direction. Therefore, as shown in FIG. 5B, the relative position of the slave projector ID1 is (x, y) = (0, −1). Then, the master projector ID0 transmits the arrangement information database DB1 to the slave projector ID1 as an information command.

  Thus, in the multi-projection system 1, when the arrangement information generation process is performed, the respective projectors can recognize the arrangement information of the master projector ID0 and the slave projector ID1 (that is, the arrangement information database DB1).

(Example 2)
Next, a multi-projection system in which projectors are arranged side by side will be described.
12A and 12B are explanatory diagrams of the multi-projection system according to the second embodiment. FIG. 12A is a front view illustrating an aspect of the multi-projection system, and FIG. 12B is a table of measurement results of electric field strength.

  As shown in FIG. 12A, in the multi-projection system 2, the projector 100 and the projector 102 are arranged side by side (left and right). The measurement result of electric field strength (field strength measurement result table H2) shown in FIG. 12B is the electric field strength in wireless communication with the projector 102, that is, the slave projector ID2. The numerical values in the electric field strength measurement result table H2 are sample values.

  In the multi-projection system 2 arranged in this way, images can be projected side by side. For example, if the display pixels of the projector 100 and the projector 102 are 1920 × 1080 pixels, respectively, the multi-projection system 2 can project an image having a total display pixel number equivalent to 3840 × 1080 pixels. Specifically, the projector 100 can be in charge of 1920 × 1080 pixel projection on the right side of the projection image, and the projector 102 can be in charge of projection of 1920 × 1080 pixel on the left side of the projection image.

  In the multi-projection system 2 of the present embodiment, an image signal output from an external image supply device is input to the image signal input unit 30 of the projector 100. The image output terminal MO of the projector 100 and the image input terminal of the image signal input unit 30 of the projector 102 are connected via an image cable (not shown). As a result, the image signal output from the projector 100 is input to the image signal input unit 30 of the projector 102.

  In the multi-projection system 2, when the multi-projection key provided on the operation panel 21 of the projector 100 is pressed, the projector 100 starts searching for another projector constituting the multi-projection system 2 together with the projector 100 as the master projector ID0. Then, the arrangement information is generated.

  Here, the arrangement information generation process in the multi-projection system 2 is the same as the process shown in the first embodiment. The relative position detection process is the same as the process shown in the first embodiment. Therefore, according to the electric field strength measurement result table H2 and the determination table T4 and the determination table T5 (in other words, depending on the electric field strengths “ELT” and “ELB”, “ERT” and “ERB”), the slave projector ID2 is It is determined that the projector is arranged in the left lateral direction of the master projector ID0.

The master projector ID0 updates the arrangement information database DB. Here, the arrangement information database DB in the present embodiment will be described.
FIG. 13 is an explanatory diagram of the arrangement information database DB2 according to the second embodiment.

  As shown in FIG. 13, the relative position of the slave projector ID2 is (x, y) = (− 1, 0). Then, the master projector ID0 transmits the arrangement information database DB2 as an information command to the slave projector ID2.

  Thus, in the multi-projection system 2, when the arrangement information generation process is performed, the respective projectors can recognize the arrangement information (that is, the arrangement information database DB2) of the master projector ID0 and the slave projector ID2.

Example 3
Next, a multi-projection system in which projectors are arranged in two vertical rows and two horizontal rows will be described.
14A and 14B are explanatory diagrams of the multi-projection system according to the third embodiment. FIG. 14A is a front view illustrating an aspect of the multi-projection system, and FIG. 14B is a table of measurement results of electric field strength.

  As shown in FIG. 14A, in the multi-projection system 3, the projector 100, the projector 101, the projector 102, and the projector 103 are arranged in two vertical rows and two horizontal rows. The measurement result of electric field strength (field strength measurement result table H3) shown in FIG. 14B is the electric field strength in wireless communication with the projector 103, that is, the slave projector ID3. The electric field strength in wireless communication with the projector 101, that is, the slave projector ID1, is the same as the electric field strength measurement result table H1, and the electric field strength in wireless communication with the projector 102, that is, the slave projector ID2, is the same as the electric field strength measurement result table H2. And The numerical values in the electric field strength measurement result table H3 are sample values.

  The projectors 101, 102, and 103 have the same configuration as the projector 100. Therefore, the same code | symbol is used for the same component. Also, illustration is omitted.

  In the multi-projection system 3 arranged in this way, it is possible to project four images side by side. For example, if the display pixels of the projector 100, the projector 101, the projector 102, and the projector 103 are 1920 × 1080 pixels, respectively, the multi-projection system 3 projects an image having a total display pixel number equivalent to 3840 × 2160 pixels. It becomes possible. Specifically, the projector 100 is responsible for projecting 1920 × 1080 pixels on the upper right side of the projected image, the projector 101 is responsible for projecting 1920 × 1080 pixels on the lower right side of the projected image, and the projector 102 is responsible for projecting the projected image. The projector 103 can be in charge of the projection of 1920 × 1080 pixels on the upper left side, and the projector 103 can be in charge of the projection of 1920 × 1080 pixels on the lower left side of the projected image.

  In the multi-projection system 3 according to the third embodiment, an image signal output from an external image supply device (not shown) is input to the image signal input unit 30 of the projector 100. Further, the image output terminal MO of the projector 100 and the image input terminal of the image signal input unit 30 of the projector 101 are connected via an image cable (not shown). Further, the image output terminal MO of the projector 101 and the image input terminal of the image signal input unit 30 of the projector 102 are connected via an image cable (not shown). Further, the image output terminal MO of the projector 102 and the image input terminal of the image signal input unit 30 of the projector 103 are connected via an image cable (not shown). Accordingly, an image signal input to the projector 100 can be input to the projector 101, the projector 102, and the projector 103.

  In the multi-projection system 3, when the multi-projection key provided on the operation panel 21 of the projector 100 is pressed, the projector 100 starts searching for another projector constituting the multi-projection system together with the projector 100 as the master projector ID0. Generate placement information.

  Here, the arrangement information generation process in the multi-projection system 3 is the same as the process shown in the first embodiment. The relative position detection process is the same as the process shown in the first embodiment. For the slave projector ID1 and the slave projector ID2, the relative positions are determined by the processing described in the first and second embodiments. For the slave projector ID3, the electric field strength measurement result table H3 and the determination table T1 and the determination table T3 (in other words, the electric field strengths “ETL” and “ETR”, “EBL” and “EBR”, “ETT” and Based on the value of “ETB”), it is determined that the master projector ID0 is arranged in the diagonally lower left direction.

The master projector ID0 updates the arrangement information database DB. Here, the arrangement information database DB in the present embodiment will be described.
FIG. 15 is an explanatory diagram of the arrangement information database DB3 according to the third embodiment.

  As shown in FIG. 15, the relative position of the slave projector ID1 is (x, y) = (0, −1). The relative position of the slave projector ID2 is (x, y) = (− 1, 0). The relative position of the slave projector ID3 is (x, y) = (− 1, −1). And master projector ID0 transmits arrangement information database DB3 to slave projector ID1, ID2, ID3 as an information command.

  Thus, in the multi-projection system 3, when the arrangement information generation process is performed, the respective projectors acquire the arrangement information (that is, the arrangement information database DB3) of the master projector ID0 and the slave projectors ID1, ID2, and ID3. Can be recognized.

Here, the combination of antennas used for relative position detection described in the present embodiment (Examples 1, 2, and 3) will be described.
FIG. 16 is an explanatory diagram of an antenna used for relative position detection.
The combination of antennas for comparing the magnitude relations of the measured electric field strengths in the vertical position detection, the horizontal position detection, and the diagonal position detection in the multi-projection systems 1, 2, 3 is shown in the magnitude relation comparison table AH 1 in FIG. It can be expressed as As described above, in the multi-projection systems 1, 2, and 3, in the case of vertical position detection, the electric field strengths of the upper and lower antennas of the master projector ID 0 and the left and right antennas of the slave projector IDx are used. In the case of lateral position detection, the electric field strengths of the left and right antennas of the master projector ID0 and the upper and lower antennas of the slave projector IDx are used. Further, in the case of position detection in an oblique direction, the electric field strengths of the upper and lower antennas of the master projector ID0 and the left and right antennas of the slave projector IDx are used. Further, although not shown in the magnitude relation comparison table AH1, in order to detect the oblique vertical direction, the electric field strengths of the upper and lower antennas of the master projector ID0 and the upper and lower antennas of the slave projector IDx are used.

According to the above-described embodiments (Example 1, Example 2, Example 3), the following effects can be obtained.
(1) When the multi-projection key provided on the operation panel 21 is pressed, the projector 100 executes master projector processing as the master projector ID0. In the master projector process, a SEARCH command is transmitted to another projector, and the presence or absence of a slave projector is detected by a response (RESP command). Then, a radio link is generated. Upon receiving the SEARCH command, the projectors 101, 102, and 103 execute slave projector processing as slave projector ID1, ID2, and ID3. In the slave projector processing, the projector attribute information (identification information (ID) and display pixel number information) is transmitted to the master projector ID0. Thereby, the arrangement information database DB for storing the IDs of the master projector ID0 and the slave projector IDx, the number of display pixels, and the relative position can be initialized. And the relative position of each projector can be detected by performing the arrangement information generation process in the multi-projection system.

  (2) The master projector ID0 includes an upper antenna 100AT on the upper surface 5T, a left antenna 100AL on the left surface 5L, a right antenna 100AR on the right surface 5R, and a lower antenna 100AB on the lower surface 5B. Each of the slave projectors IDx includes an upper antenna 10xAT on the upper surface 5T, a left antenna 10xAL on the left surface 5L, a right antenna 10xAR on the right surface 5R, and a lower antenna 10xAB on the lower surface 5B. The control unit 20 and the wireless communication unit 40 switch each antenna of the master projector ID0 and each antenna of the slave projector ID1, and perform wireless communication of each combination. The wireless communication unit 40 measures the electric field strength of wireless communication performed between each antenna of the master projector ID0 and each antenna of each slave projector IDx, and the control unit 20 measures the electric field strength measurement result table H1, H2, H3. Is generated. Then, the master projector ID0 can perform relative position detection processing, and can specify the relative position of each slave projector IDx based on the magnitude relation of the electric field strength. As a result, each slave projector IDx with respect to the master projector ID0 has a vertically downward direction, a vertically upward direction, a right obliquely downward direction, a right obliquely upward direction, a left obliquely downward direction, a left obliquely upward direction, a right lateral direction, and a left lateral direction. It is useful because it is possible to determine which one is.

  (3) When the arrangement information database DB is completed based on the detected relative position of each slave projector IDx, the master projector ID0 has a relative arrangement relationship of all the projectors constituting the multi-projection systems 1, 2, and 3. Can be recognized. Then, the master projector ID0 can grasp its own projection area. In other words, the input image (image signal) is useful because it can grasp and project the range (projection area) in which it is in charge of projection.

  (4) The master projector ID0 transmits the arrangement information databases DB1, DB2, DB3 as information commands to each slave projector IDx. Thereby, all the slave projector IDx can recognize the arrangement relationship of each projector, and the slave projector IDx can recognize its own arrangement. Therefore, all the projectors constituting the multi-projection systems 1, 2, and 3 can recognize their own arrangement, and in the input image (image signal), the range (projection area) in which the projector is responsible for projection is determined. I can grasp it. That is, it is useful because an image signal corresponding to its own projection area can be extracted and projected from the entire input image signal.

  (5) The projector 100 (ID0) obtains the total display pixel number information configured by all the projectors based on the display pixel number information and the arrangement information of each projector 100, 101, 102, 103 in the arrangement information database DB. calculate. Then, the total display pixel number information is stored in the display attribute storage unit 22. The total display pixel number information stored in the display attribute storage unit 22 of the master projector ID0 can be referred to from an external image supply device. Accordingly, the image supply device refers to the total pixel number information of the multi-projection systems 1, 2, and 3, generates an image according to the total pixel number information, and the master projector of the multi-projection systems 1, 2, 3 This is useful because it can be supplied to ID0.

  (6) The projector 100 operates as the master projector ID0 when the multi-projection key is pressed, and operates as the slave projector IDx when receiving the SEARCH command. Thus, since it can operate as either the master projector ID0 or the slave projector IDx, the convenience when constructing the multi-projection system is improved. Further, if the projectors 101, 102, and 103 have the same configuration as the projector 100, they can operate as the master projector ID0 or as the slave projector IDx, and when constructing a multi-projection system. Improved convenience.

  In addition, it is not limited to embodiment mentioned above, It is possible to implement by adding various change, improvement, etc. A modification will be described below.

  (Modification 1) In the above embodiment, the image supply device (not shown) is configured to display an entire image (entire image signal) based on the total display pixel number information stored in the display attribute storage unit 22 of the master projector ID0. Is generated and supplied to the master projector ID0. The image output terminal MO of the master projector ID0 and the image signal input unit 30 of the slave projector ID1 are connected. Similarly, each of the slave projectors ID2 and ID3 is connected in series from an upstream projector to input an image signal. However, the image supply device may supply image signals to the master projector ID0 and the slave projectors ID1, ID2, and ID3, respectively. That is, the image supply device and each projector may be connected in parallel. In this case, the image supply device acquires information about the number of display pixels of each projector and information indicating its own arrangement recognized by each projector based on the arrangement information database from each projector or master projector, and sends the information to each projector. Alternatively, an image signal of an image in a range (projection area) in which each is in charge of projection may be supplied.

  (Modification 2) In the above-described embodiment, the multi-projection system 1 including two projectors 100 and 101, the multi-projection system 2 including two projectors 100 and 102, and the projectors 100 and 101 are provided. However, the number and arrangement of the projectors constituting the multi-projection system are not limited to these. The number of projectors constituting the multi-projection system may be plural, and the arrangement can be various. In the above embodiment, the relative position of the slave projector ID1 relative to the master projector ID0, in other words, the relative direction is specified based on the magnitude relationship of the electric field strength for each antenna. For this reason, when the number of projectors constituting the multi-projection system increases, accurate arrangement information cannot be obtained only in the relative direction. In such a case, the perspective in a predetermined direction can be determined by using the absolute value of the electric field strength. In addition to the master projector ID 0, the authority of the sub master projector is given to other projectors, the position is detected by the master projector and the sub master projector, and the result is collated to arrange the entire multi-projection system. Information may be generated.

  (Modification 3) In the above embodiment, in the multi-projection systems 1, 2, 3, in the case of vertical position detection, the electric field strength between the upper and lower antennas of the master projector ID 0 and the left and right antennas of the slave projector IDx Was used. In the case of lateral position detection, the electric field strengths of the left and right antennas of the master projector ID0 and the upper and lower antennas of the slave projector IDx were used. In the case of oblique position detection, the electric field strengths of the upper and lower antennas of the master projector ID0 and the left and right antennas of the slave projector IDx were used. However, the combinations of antennas used for position detection in the vertical direction, the horizontal direction, and the diagonal direction are not limited to those described above. A combination of antennas other than those described above may be used.

  (Modification 4) In the above embodiment, the antenna switching order is the order of the upper antenna AT, the left antenna AL, the right antenna AR, and the lower antenna AB. However, the present invention is not limited to this. Other orders may be used.

  (Modification 5) In the above embodiment, each of the projectors 100, 101, 102, and 103 includes four antennas, but is not limited to four. It is only necessary to have a plurality of antennas and detect the relative position by detecting the magnitude relationship of the electric field strength when the master projector ID0 switches the plurality of antennas of the slave projector IDx.

  (Modification 6) In the above embodiment, the wireless communication between the master projector ID0 and the slave projector ID1 is performed by Bluetooth. However, the present invention is not limited to Bluetooth. Other wireless communications may be used.

  (Modification 7) In the above embodiment, the image signal input to the master projector ID0 is input to the slave projector ID1 connected to the image signal output terminal MO via the image cable. Similarly, the image signal is input from the image signal output terminal MO of the slave projector ID1 to the slave projector ID2, and from the image signal output terminal MO of the slave projector ID2 to the slave projector ID3. However, without using an image cable, the master projector ID0 may transmit an image signal (image information) to each slave projector IDx by wireless communication by the wireless communication unit 40.

  (Modification 8) At least one of the upper antenna AT, the left antenna AL, the right antenna AR, and the lower antenna AB in the above embodiment may be used for other purposes in addition to wireless communication with other projectors. Good. For example, if the projector 100 is a projector capable of projecting 3D format video, the projector 100 may also be used for wireless communication for synchronizing the projector 100 and 3D glasses. Further, it may be used for communication with a remote controller or the like.

  (Modification 9) In the above-described embodiment, the light source device 11 includes the discharge-type light source lamp 11a. However, a solid light source such as an LED (Light Emitting Diode) light source or a laser, or another light source is used. It can also be used.

  (Modification 10) In the above embodiment, the projectors 100, 101, 102, and 103 use transmissive liquid crystal light valves 12R, 12G, and 12B, that is, liquid crystal panels, as the light modulators. It is also possible to use a reflection type light modulation device such as a light valve. In addition, it is possible to use a micromirror array device that modulates light emitted from a light source by controlling the emission direction of incident light for each micromirror as a pixel.

  (Modification 11) In the above embodiment, the projector 100 is described as an example. However, the display device is not limited to the projector. For example, a rear projector, a liquid crystal display, a plasma display, an organic EL (Electro Luminescence) display, a CRT (cathode ray tube) display, or a self-luminous type such as a television receiver, which are integrally provided with a transmission screen. It can also be applied to a display device or the like.

  DESCRIPTION OF SYMBOLS 1, 2, 3 ... Multi-projection system, 5 ... Housing, 5B ... Lower surface, 5F ... Front surface, 5L ... Left surface, 5R ... Right surface, 5T ... Upper surface, 10 ... Image projection part, 11 ... Light source device, 11a ... Light source lamp , 11b ... reflector, 12R, 12G, 12B ... liquid crystal light valve, 13 ... projection lens, 14 ... liquid crystal driving unit, 20 ... control unit, 21 ... operation panel, 22 ... display attribute storage unit, 30 ... image signal input unit, 31 ... Image processing unit, 40 ... Wireless communication unit, 100, 101, 102, 103 ... Projector, 100AB ... Lower antenna, 100AL ... Left antenna, 100AR ... Right antenna, 100AT ... Upper antenna, 101AB ... Lower antenna, 101AL ... Left Antenna, 101AR ... Right antenna, 101AT ... Upper antenna, 401 ... Baseband processing unit, 402 ... RF modulation / demodulation , 403 ... RF switch, 404 ... AD conversion unit, DB, DB0, DB1, DB2, DB3 ... arrangement information database, SC ... projection surface.

Claims (11)

A display device,
A display for displaying an image;
A first communication unit arranged on an upper surface adjacent to a surface on which the display unit of the housing of the display device performs display output, and wirelessly communicates with another display device;
A second communication unit that is disposed on a lower surface adjacent to a surface on which the display unit of the display device housing performs display output, and wirelessly communicates with the other display device;
A third communication unit that is disposed on a left surface adjacent to a surface on which the display of the housing of the display device performs display output and wirelessly communicates with the other display device;
A fourth communication unit that is disposed on a right surface adjacent to a surface on which the display unit of the display device housing performs display output and wirelessly communicates with the other display device;
A communication control unit that controls the first communication unit , the second communication unit , the third communication unit, and the fourth communication unit ;
With
The communication control unit
The electric field strength of wireless communication performed between the first communication unit and the left communication unit of the other display device is between the first communication unit and the right communication unit of the other display device. field intensity of the radio communication performed between the carried out greater than the field intensity of the radio communication, and the communication unit of the left surface of the second communication unit and the other display devices in the said and said second communication unit When the electric field strength of wireless communication performed with the communication unit on the right side of another display device is larger than
(A) The electric field strength of wireless communication performed between the first communication unit and the communication unit on the upper surface of the other display device is a communication unit on the lower surface of the first communication unit and the other display device. If it is larger than the electric field strength of the wireless communication performed between the other display device and the display device is determined to be arranged in a diagonally lower right direction,
(B) The electric field intensity of wireless communication performed between the first communication unit and the communication unit on the upper surface of the other display device is the communication unit on the lower surface of the first communication unit and the other display device. If it is smaller than the electric field strength of the wireless communication performed between and the other display device is determined to be arranged in the upper right direction with respect to the display device,
The electric field strength of wireless communication performed between the first communication unit and the left communication unit of the other display device is between the first communication unit and the right communication unit of the other display device. The field strength of wireless communication performed between the second communication unit and the communication unit on the left side of the other display device is smaller than the field strength of wireless communication performed in the second communication unit and the second communication unit. When the electric field strength of wireless communication performed with the communication unit on the right side of the other display device is small,
(C) The electric field strength of wireless communication performed between the first communication unit and the communication unit on the upper surface of the other display device is the communication unit on the lower surface of the first communication unit and the other display device. If it is larger than the electric field strength of the wireless communication performed between and the other display device, it is determined that the display device is arranged in a diagonally lower left direction,
(D) The electric field strength of wireless communication performed between the first communication unit and the communication unit on the upper surface of the other display device is the communication unit on the lower surface of the first communication unit and the other display device. If it is smaller than the electric field strength of the wireless communication performed between the other display device, it is determined that the other display device is arranged in the upper left diagonal direction with respect to the display device,
A display device characterized by that. The display device according to claim 1,
The field strength of wireless communication performed between the first communication unit and the left communication unit of the other display device and between the first communication unit and the right communication unit of the other display device. The field strength of the wireless communication performed is the same, and the field strength of the wireless communication performed between the second communication unit and the communication unit on the left side of the other display device, the second communication unit, and the other If the field strength of wireless communication performed with the communication unit on the right side of the display device is equal,
(E) The electric field strength of wireless communication performed between the first communication unit and the left communication unit of the other display device is the second communication unit and the left communication unit of the other display device. If it is larger than the electric field strength of the wireless communication performed between, the other display device is determined to be arranged in the vertical direction with respect to the display device,
(F) The electric field strength of wireless communication performed between the first communication unit and the left communication unit of the other display device is the second communication unit and the left communication unit of the other display device. The other display device is determined to be arranged vertically downward with respect to the display device if it is smaller than the electric field strength of wireless communication performed between,
A display device characterized by that. The display device according to claim 1 or 2,
Between the electric field intensity of wireless communication performed between the third communication unit and the communication unit on the upper surface of the other display device, and between the third communication unit and the communication unit on the lower surface of the other display device. The field strength of the wireless communication performed is equal, and the field strength of the wireless communication performed between the fourth communication unit and the communication unit on the upper surface of the other display device is the fourth communication unit and the other. If the field strength of wireless communication performed with the communication unit on the lower surface of the display device is equal,
(G) The electric field intensity of wireless communication performed between the third communication unit and the communication unit on the upper surface of the other display device is the fourth communication unit and the communication unit on the upper surface of the other display device. If the electric field strength of the wireless communication performed between is small, it is determined that the other display device is arranged in the right lateral direction with respect to the display device,
(H) The electric field strength of wireless communication performed between the third communication unit and the communication unit on the upper surface of the other display device is the fourth communication unit and the communication unit on the upper surface of the other display device. If the electric field strength of the wireless communication performed between is large, it is determined that the other display device is arranged in the left lateral direction with respect to the display device.
A display device characterized by that. The display device according to any one of claims 1 to 3,
The communication control unit switches between the first communication unit and the second communication unit to perform wireless communication with another display device. The display device according to any one of claims 1 to 4,
The communication control unit issues an instruction to the other display device, the other display devices display device, characterized in that to switch the plurality of the communication unit in the order provided in the. A display device according to any one of claims 1 to 5 ,
An arrangement information generation unit that generates arrangement information representing a relative arrangement relationship between the display device and the other display device based on the relative position of the other display device;
A storage unit for storing the arrangement information generated by the arrangement information generation unit;
A display device further comprising: The display device according to claim 6 ,
A display device, further comprising: an arrangement information transmission unit that transmits the arrangement information generated by the arrangement information generation unit to the other display device. The display device according to claim 7 ,
A pixel number storage unit for storing first display pixel number information indicating the display pixel number of the display device;
A pixel number information receiving unit that receives second display pixel number information representing the number of display pixels of the other display device from the other display device;
The total display pixel number information indicating the number of display pixels of the entire image formed by arranging the display images of the display device and the other display device, the first display pixel number information, the second display pixel number Information, and a total display pixel number calculation unit that calculates based on the arrangement information;
A display device further comprising: The display device according to claim 8 ,
A total pixel number storage unit for storing the arrangement information and the total display pixel number information;
The total pixel number storage unit is configured to be referable from outside the display device. A display device according to any one of claims 1 to 9 ,
A display system comprising the other display device. A display unit that displays an image ; a first communication unit that is disposed on an upper surface adjacent to a surface on which the display unit of the housing of the display device performs display output; and that performs wireless communication with another display device; and the display device The display unit of the housing of the display device is disposed on the upper surface adjacent to the surface that performs display output, and the second communication unit wirelessly communicates with the other display device, and the display unit of the housing of the display device performs display output. A third communication unit that is disposed on the upper surface adjacent to a surface that performs display output, and that the display unit of the housing of the display device is disposed on a left surface adjacent to a surface that performs display output, and that wirelessly communicates with the other display device; The display unit of the housing of the display device is arranged on the right surface adjacent to the surface that performs display output, the fourth communication unit that wirelessly communicates with the other display device, the first communication unit , the first the communication unit of 2, the third communication unit, and the communication for controlling said fourth communication unit A control method of the display device comprising: a control unit, a
The communication control unit
The electric field strength of wireless communication performed between the first communication unit and the left communication unit of the other display device is between the first communication unit and the right communication unit of the other display device. field intensity of the radio communication performed between the carried out greater than the field intensity of the radio communication, and the communication unit of the left surface of the second communication unit and the other display devices in the said and said second communication unit When the electric field strength of wireless communication performed with the communication unit on the right side of another display device is large,
(A) The electric field strength of wireless communication performed between the first communication unit and the communication unit on the upper surface of the other display device is a communication unit on the lower surface of the first communication unit and the other display device. Determining that the other display device is disposed in a diagonally lower right direction with respect to the display device, if the field strength of the wireless communication performed between
(B) The electric field intensity of wireless communication performed between the first communication unit and the communication unit on the upper surface of the other display device is the communication unit on the lower surface of the first communication unit and the other display device. Determining that the other display device is arranged in a diagonally upper right direction with respect to the display device if the field strength is lower than the field strength of wireless communication performed between
The electric field strength of wireless communication performed between the first communication unit and the left communication unit of the other display device is between the first communication unit and the right communication unit of the other display device. The field strength of wireless communication performed between the second communication unit and the communication unit on the left side of the other display device is smaller than the field strength of wireless communication performed in the second communication unit and the second communication unit. When the electric field strength of wireless communication performed with the communication unit on the right side of the other display device is small,
(C) The electric field strength of wireless communication performed between the first communication unit and the communication unit on the upper surface of the other display device is the communication unit on the lower surface of the first communication unit and the other display device. Determining that the other display device is arranged in a diagonally lower left direction with respect to the display device, if the field strength of the wireless communication performed between
(D) The electric field strength of wireless communication performed between the first communication unit and the communication unit on the upper surface of the other display device is the communication unit on the lower surface of the first communication unit and the other display device. Determining that the other display device is disposed in an obliquely upper left direction with respect to the display device if the field strength of the wireless communication performed between
A control method for a display device, comprising:

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