WO2004068859A1 - 映像表示システム及び映像表示装置 - Google Patents
映像表示システム及び映像表示装置 Download PDFInfo
- Publication number
- WO2004068859A1 WO2004068859A1 PCT/JP2003/012548 JP0312548W WO2004068859A1 WO 2004068859 A1 WO2004068859 A1 WO 2004068859A1 JP 0312548 W JP0312548 W JP 0312548W WO 2004068859 A1 WO2004068859 A1 WO 2004068859A1
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- WIPO (PCT)
- Prior art keywords
- display device
- video display
- image
- server
- communication interface
- Prior art date
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- 238000004891 communication Methods 0.000 claims abstract description 144
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 6
- 241001422033 Thestylus Species 0.000 description 5
- 238000010276 construction Methods 0.000 description 2
- 101100243945 Fusarium vanettenii PDAT9 gene Proteins 0.000 description 1
- 208000012204 PDA1 Diseases 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 101150102492 pda1 gene Proteins 0.000 description 1
- 229920001690 polydopamine Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
- H04N21/41407—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance embedded in a portable device, e.g. video client on a mobile phone, PDA, laptop
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
- H04N21/41415—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance involving a public display, viewable by several users in a public space outside their home, e.g. movie theatre, information kiosk
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
- H04N21/43637—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
- H04N7/17309—Transmission or handling of upstream communications
- H04N7/17318—Direct or substantially direct transmission and handling of requests
Definitions
- the present invention relates to a video display system and a video display device each including a video distribution server having a wireless communication function and a plurality of display devices (displays), and performing ad hoc communication between the plurality of display devices.
- a video distribution server having a wireless communication function and a plurality of display devices (displays), and performing ad hoc communication between the plurality of display devices.
- a distribution server is connected to a plurality of display devices through a wired Internet line
- the server distributes an image (commercial image), controls a plurality of connected display devices (controls display timing), and the like, and displays a commercial image sent from the distribution server on each display device. .
- each portable information terminal is configured to be able to wirelessly retrieve and download various information from the display device.
- An object of the present invention is to provide a video display system and a video display device that perform smooth communication while suppressing radio wave interference and avoiding information interference.
- a server and a display device are connected by wireless communication, and received data is successively relayed from a display device connected to the server to another display device.
- Image distribution to a display device separated from the server is enabled.
- the display device of the present invention has a communication function with a user terminal, and applies wireless communication systems of different frequency bands to communication between the display devices and communication between the display device and the user terminal. For this communication, a communication method that has a higher frequency band and a larger communication capacity than the communication between the user terminal and the display device is adopted.
- each display device in order to secure the communication capacity between the display devices, each display device is configured to be able to execute communication in two frequency bands simultaneously (concurrently), and a server or another display device is used in one frequency band. When communicating with another display device, it communicates with another display device in another frequency band.
- FIG. 1 is a diagram showing a table system according to a first embodiment of the present invention.
- FIG. 2 is a schematic block diagram of a display device according to the first embodiment of the present invention.
- FIG. 3 is a diagram showing another configuration of the display system according to the first embodiment of the present invention.
- FIG. 4 is a diagram showing a normal image on the screen of the display device and the portable information terminal according to the first embodiment of the present invention.
- FIG. 5 is a diagram showing an image of the display device of the first embodiment of the present invention and a screen of the portable information terminal when the area guidance service is provided.
- FIG. 6 is a diagram showing a numbered ticket downloaded to the portable information terminal according to the first embodiment of the present invention.
- FIG. 7 is a flowchart showing a processing procedure of the display device according to the first embodiment of the present invention.
- FIG. 8 is a flowchart showing a processing procedure of the distribution server according to the first embodiment of the present invention '.
- FIG. 9 is a table of numbers indicating types of requests from the display device to the distribution server according to the first embodiment of the present invention.
- FIG. 10 is a diagram showing a format for requesting data from a display device to a distribution server according to the first embodiment of the present invention.
- FIG. 11 is a table of numbers indicating types of distribution data from the video distribution server to the display device according to the first embodiment of the present invention.
- FIG. 12 shows a format of data to be distributed from the server to the display device according to the first embodiment of the present invention. .
- FIG. 13 is a diagram showing a display system according to a second embodiment of the present invention.
- FIG. 14 is a schematic block diagram of a display device according to the second embodiment of the present invention.
- FIG. 1 is a conceptual diagram showing an overall configuration of a video display system according to a first embodiment of the present invention.
- This system is installed in event venues, subway and station corridors, department stores, etc., displays commercial images, and is preferably used as a substitute for local information boards.
- this system communicates wirelessly with a personal digital assistant (PDA), a portable information terminal (user terminal) such as a mobile phone, or a device such as a wireless tag, so that a commercial image or area guide map being displayed is displayed. It has functions such as distributing service information related to and to mobile information terminals.
- PDA personal digital assistant
- user terminal such as a mobile phone
- a device such as a wireless tag
- Reference numeral 101 denotes a server having a video data distribution and control function and a communication function with an Internet communication network serving as a pack and a bone.
- the server is connected to the Internet communication network 13 1 through a wired LAN line 13 2. It is connected.
- Server 101 is a 5 GHz band wireless communication standard
- I EEE 802.11a is a high-speed wireless communication standard with a maximum communication speed of 54 Mbps.
- Reference numeral 102 denotes a display device, which includes an antenna 1.28 for wireless communication with the server 101 and an antenna 122 for wireless communication with another display device 103.
- Each of the antennas 128 and 122 is an antenna for the 5 GHz band wireless communication standard I EEE 802.11a.
- the display device 102 includes an antenna 125 for wireless communication with a mobile phone 105, a PDA 106, 107, a wireless Tag 109, or the like.
- the antenna 125 is an antenna conforming to the 2.4 GHz band wireless communication standard I EEE 802.11b.
- I EEE 80 is an antenna conforming to the 2.4 GHz band wireless communication standard
- 2.11b is a wireless communication standard with a maximum communication speed of 11 Mb ps, lower frequency and lower communication capacity than IEEE 802.11a.
- the wireless communication standards IE EE802.11a and IEEEE802.11b will be applied to the wireless interface.
- wireless communication standards IE EE802.11a and IEEEE802.11b will be applied to the wireless interface.
- other wireless communication standards may be used.
- optical communication or the like is also applicable.
- n display devices 103 and 104 having the same configuration as the display device 102 are used. Connected in cascade over a wireless network.
- the display devices 103 and 104 are, like the display device 102, two antennas 129 and 123, 130 and 1 2 '4 for non-communication between the display devices, respectively, and a PDA, a mobile phone, It has antennas 126, 127 for communication with wireless Tag and the like.
- FIG. 2 is a block diagram showing a schematic configuration of the display devices 102, 103, and 104.
- the display device 103 is controlled by the central processing unit 207.
- the central processing unit 207 is connected to a display unit 202, a storage unit 203 such as a hard disk, and communication interfaces 204, 205, and 206.
- the communication interfaces 204 and 205 are interfaces for performing protocol processing of the 5 GHz band wireless communication standard IEEEE 802.11a, and are connected to antennas 123 and 129, respectively.
- the communication interface 206 is an interface that performs protocol processing of the 2.4 GHz band wireless communication standard IEE802.lib, and is connected to the antenna 126.
- the communication interface 206 that performs wireless communication with other display devices 102 and 104 rather than the communication interface 206 that performs wireless communication with a portable information terminal such as a PDA 106 or a mobile phone 105 or a wireless Tag 109.
- Interfaces 204 and 205 have higher frequencies.
- the communication interface 205 is used for communication with the adjacent display device 102 on the upstream side of the wireless network, and the communication interface 204 is used for communication with the adjacent display device 104 on the downstream side.
- the frequencies used by the communication interfaces 204 and 20.5 may be different from each other in order to suppress radio wave interference between the display devices.
- each display device normally plays a commercial video sent from the server, as in a display device 103 shown in FIG.
- the display device 103 transfers screen information related to the screen being displayed to the PDA 107, and the PDA 107 Then, a screen as shown in Fig. 4 is displayed.
- the display device 103 downloads the numbered ticket shown in FIG. 6, for example, to the PDA107. Is done.
- FIG. 7 is a flowchart showing the operation sequence of the central processing unit 207 of each of the display devices 102, 103, and 104.
- FIG. 8 is a flowchart showing the operation sequence of the server 101.
- FIG. 0 shows the format of a data request message used when the display device 103 requests data from the server.
- FIG. 9 shows the correspondence between request numbers and request types used in the format of FIG.
- FIG. Fig. 12 shows the format of the data frame used when the server 101 sends image data to the display devices 102, 103, and 104.
- Fig. 11 shows the format of the data frame used in Fig. 12.
- FIG. 6 is a diagram showing a correspondence relationship between data type numbers and data contents.
- the server 101 sends the address (identifier ID) of the display device 102 to which the server 101 should directly perform wireless communication and the data existing in the system from a storage unit (not shown).
- the address of the display device 103 or 104 to be the destination is read as the video data distribution destination information (step 8001).
- the server 101 detects whether there is a display device 102 to be directly communicated with via the antenna 122, and if so, starts wireless communication (step 8002).
- the server 101 sends a normal screen (FIG. 4) to the display device 102 in the format shown in FIG. 12 (step 8003). That is, the first block (field) 1 201 of the data frame for normal screen transmission is set to “1” indicating that the data is transmitted from the server to the display device 102, and in the distribution destination display block 1202, In step 800, "1" is set to the bit corresponding to the ID number of the display device to which the data is read, and "0" is set to the other bits.
- the data type display block 1 203 is set to "1" indicating a normal screen, and thereafter, the video data to be displayed on the display device is set. Data 1204 and the video data 1205 for the portable information terminal related to this video data.
- the video for mobile information terminals is not limited to one type, and multiple types of video may be sent depending on the number of types of mobile information terminals that can be connected.
- the distribution destination information may be transmitted only when the first connection is established, or may be transmitted each time a connection is established.
- the display device 102 'or the like stores the distribution destination information received from the server 101 in the storage unit 203. However, the display device 102 and the like may store distribution destination information in the storage unit 203 in advance without receiving distribution from the server 101.
- the central processing unit 207 of the display device determines the address number of the server 101 or the display device 103 with which it should directly communicate after starting up.
- the data is read from the storage unit 203 (Step 7.001), and a connection with the server 101 is established (Step 7002).
- the central processing unit 207 of the display device 102 communicates directly with the server 1.01 via the high-frequency large-capacity communication interface 205 and the antenna 128 to notify the establishment of the connection.
- the central processing unit 207 of the display device 103 establishes a connection with the display device 102 on the upstream side, and notifies the server 101 of the connection establishment of the display device 103 via the display device 102. I do.
- the central processing unit 207 checks whether or not there is another display device to which it directly communicates, based on the result read in step 7001 (step 7003). If there is a display device with which to directly communicate, establish a connection with the above display device via the communication interface 204 and the antenna 122 (123, 124) (step 7004). ). After establishing the connection with the display device 103, the display device 102 notifies the server 101 that the display device 103 has been connected. The display device 102, for example, upon receiving a connection notification with the display device 104 from the downstream display device 103, notifies the server 101 that the display device 104 has been connected. In this way, the connection of the display devices is sequentially notified to the server 101 via the intermediate display device in the order of the display devices 102, 103...
- the display device 102 (1 03, 104) is connected to the antenna 1 28 (1 29, 1 30). Then, the data frame of the normal screen distributed from the server 101 is received via the communication interface 205 (step 705). Since the video data frame distributed by the server 101 has the format shown in Fig. 12, the central processing unit 207 checks the distribution destination display block 122 of the received frame, and checks its own ID. "1" is set to the bit position corresponding to the number (for example, display device 102 is the first bit of block 122, display device 103 is the second bit of block 122). If it is determined that the video data is to be received by the own display device, the video data is stored in the storage unit 203.
- one of the display device image 122 and the portable information terminal image 125 is stored in the storage unit 203.
- the server 101 distributes video data to be displayed on the portable information terminal together with video data to be displayed on the display device 102, and the central processing unit 207 of each display device has a storage unit.
- the video for display device 124 is output to the display unit 202.
- the central processing unit 207 transmits the received video data frame to the next display located on the downstream side via the communication interface 204 and the antenna 122 (123, 124). It is transmitted to the device (display device 103 for display device 102). -The following operation will be described below, focusing on the display device 102.
- the central processing unit 207 of the display device 102 communicates with the communication interface 200.
- the video data is received via 5 (step 7006).
- the central processing unit 2007 does not store the received video data in the storage unit 203, but receives the received frame data. Is transferred to the next display device 103 on the downstream side via the communication interface 204 (step 7007).
- the central processing unit 207 of the display device 102 temporarily stores the video data to be transferred to the display device 103 on the downstream side in the storage unit 203, and then stores the video data in the storage unit 203.
- the central processing unit 207 After reading out the video data to be transferred to the display device 103 and transmitting it to the display device 103, the video data that is no longer needed may be deleted from the storage unit 203.
- the central processing unit 207 sends the request data to the server 101. Is transferred to the server 101 via the communication interface 205 (step 709). It checks whether there is a connection with the portable information terminal (step 7001), and if there is no connection with the portable information terminal, returns to step 7005 and returns to the next distribution video data from the server 101, Or wait for request data from another display device 103 or 104.
- the central processing unit 207 sends the information for the portable information terminal attached to the normal screen stored in the storage unit 203.
- the image 125 is sent to the PDA 106 via the low-frequency band communication interface 206 (step 7101).
- the surface shown in FIG. 4 is displayed on the display device and the portable information terminal.
- the area guidance service images 501 and 502 shown in Fig. 5 are provided. Is done.
- the display on the PDA is also automatically switched to the image 502 related to the area guidance service image 501.
- the numbers of the main buildings included in the area guide map displayed on the display device 103 are displayed. Clicking on Lass 401 changes the PDA screen to the detailed building description screen.
- the server 101 Since the display size (resolution) of the mobile information terminal is smaller than the display size (resolution) of the display device 103, the server 101 displays the display image of the mobile information terminal on the display device 103. It is preferable to distribute it after making it smaller.
- the central processing unit 207 of the display device 103 When displaying an image having the same content as the image displayed on the display device 103 on the portable information terminal, the central processing unit 207 of the display device 103 is provided with a display device to fit the display size of the portable information terminal.
- the display image of 103 may be automatically resized (for example, reduced) and transmitted to the portable information terminal.
- the central processing unit 207 of the display device 103 converts the still image from the display image of the display device 103. take out, This may be resized and transmitted to the portable information terminal.
- the central processing unit 207 specifies the display image on the display unit 202 when the portable information terminal is connected, and reads the image for the portable information terminal accompanying the specific image from the storage unit 203 using the specific image as a key. May be issued.
- the central processing unit 207 When the central processing unit 207 detects that the double circle 402 has been clicked on the PDA 106 (step 7012), it issues a regional guidance screen request to the server 101 in the format shown in FIG. Step 70 1 3). "0" is set in the block 1001 of the above area guide screen request, and only the first bit corresponding to the ID number "1" of the display device 102 is set to "1" in the request source display block 1002. , Other bits (2nd to Nth bits) are set to "0", and the request number block 1003 is set to the value "1" (see Fig. 9) indicating the regional guidance screen. ing.
- the area guide screen request is transmitted to the server 101 via the communication interface 205 using a high frequency band and having a large communication capacity.
- the server 101 When receiving the request message (request data) from the display device 102 (step 8004), the server 101 checks the content of the block 1003 in the request message as shown in FIG. If the request is for a guidance screen (step 8005), the local guidance screen is transmitted to the requesting display device in the frame format shown in FIG. 12 (step 8006). Specifically, in the data frame of the area proposal screen, “1” is set in the block 1 201, and the delivery destination display block 1202 has the first frame corresponding to the ID number of the display device 102 of the request source. Only one bit is “1”, the other 2nd to Nth bits are set to “0”, and the block 1 203 is set to a value “2” indicating a local plan screen.
- the video for display device For example, the image 501 of FIG. 5 is transmitted as 124, and the image 502 of FIG. 5 is transmitted as the video for portable information terminal 125.
- the above-mentioned area guide screen is sent from the server 101 to the display device 102 via the communication interface 205 using a high frequency band and having a large communication capacity.
- the distribution destination display block 1 Check the contents of 202.
- the central processing unit 2007 stores the received screen data (the display device image 124 and the portable information terminal image 122) in the storage unit 203, and then displays the display device image. 1204 is displayed on the display section 202, and the video for mobile information terminal 125 is transferred to the mobile information terminal via the communication interface 206 (step 7015).
- the screen shown in Fig. 5 is displayed on the display device and the portable information terminal, and the user of the portable information terminal displays any one of the circle 1, circle 2, circle 3, and circle 4 on the screen with the stylus.
- the central processing unit 207 executes the detailed information service (detailed information to the server) responding to the above click operation by the portable information terminal user in step 716. From the request of the detailed information screen to the display of the detailed information screen), and when these detailed information services are completed, the server is requested to transmit the normal screen shown in FIG. 4 (step 7001). Return to step 7005.
- the detailed information service failed information to the server
- the central processing unit 207 When the central processing unit 207 detects that the star 403 has been clicked on the PDA 106 from the control message (step 70 18), the central processing unit 207 downloads the numbered ticket to the server 101 in the format shown in FIG. 10. Issue the request (step 70 19).
- the block 1 001 is set to "0”
- the request source display block 1002 contains the first bit “1” corresponding to the display device 102, and the other display devices Corresponding 2nd to Nth bits are set to “0”
- request number display block 1003 is set to a value “2” (see FIG. 9) indicating a numbered ticket download request
- block 1004 The number of numbered ticket downloads m is set.
- the block 1004 indicates a value of m> l.
- the numbered ticket download request message is transmitted to the server 101 via the communication interface 205 using a high frequency band and having a large communication capacity.
- the server 101 when the server 101 receives the above request message from the display device 102 (step 8004), the received request message is converted into a numbered ticket download request from the contents of the request number display block 1003, as shown in FIG. It recognizes that there is (Step 8007), and transmits the numbered ticket image in the format shown in FIG. 12 of the display device of the request source (Step 8008).
- the download frame of the numbered ticket image specifically, "1" is set in the block 1 201, and the destination display block 1202 has "1" in only the first bit corresponding to the display device 102.
- the second to Nth bits corresponding to "" and other display devices are set to "0", and the data type display block 1 203 is set to the value "3" indicating the numbered ticket. .
- the image 1204 for the display device is not transmitted, and the numbered ticket image shown in FIG. 6 is transmitted as the image 1205 for the portable information terminal.
- the numbered ticket image is sent to the display device 102 via the communication interface 205 using a high frequency band and having a large communication capacity.
- the server 101 After transmitting the numbered ticket image data, the server 101 counts the number of the numbered tickets so that the number m of download requests indicated by the block 1004 of the request data is added to the number of numbered tickets issued up to the present time. Up (Step 8009).
- the normal screen is replaced with a screen clearly indicating that the numbered ticket download service has been completed (step 8101). If the request received from the display device is the above-described area guide screen request or numbered ticket request, the process returns to step 8003, and if the request is other than the area guide screen request and the numbered ticket request (step 8012), After performing other processing corresponding to the request contents (step 8003), the process returns to step 8003. As a result, the normal screen is distributed to the display device 102 (103, 104). When the download service ends, the normal screen associated in step 8011 is displayed on the display device.
- the central processing unit 207 of the display device 102 receives the numbered ticket image data from the server via the communication interface 205, only the first bit is “1” in the destination display block 1202 and the second bit Since the Nth bit is “0”, the received data is data to be received only by the display device 102 itself, and the set value of the data type display block 1203 is “3”. Therefore, it can be confirmed that the received data is a numbered ticket download image.
- the central processing unit 207 stores the received video data in the storage unit 203, and then transfers the mobile information terminal video 1 205 to the mobile information terminal via the communication interface 206 (numbered ticket download: 7020 ). As a result, the screen shown in FIG. 6 is displayed on the portable information terminal.
- the server 101 and the display device 102 do not necessarily need to be directly connected by a wireless network. For example, as shown in FIG.
- a wireless repeater 301 for relaying a signal between the display device 102 and the server 121, Connect the device 102 via a wired network, and connect the display device 102 to the next display device 103 and the display device 103 to the next display device via a wireless network.
- It may be a network configuration. -According to the network configuration of the first embodiment of the present invention described above, between the server 101 and the display device other than the display device 102, for example, the server 101 and the display device 104 During this period, it is not necessary to connect directly by wireless communication, so images can be distributed to the display device 104 located far away from the server 101 so that radio waves cannot reach it. .
- the server 101 and the display device 104 may be located between the server 101 and the display device 104 to relay image data and control information.
- the video can be distributed to the display device 104 by adjusting the position of the display device.
- each display device needs a communication interface corresponding to the operating frequency of the display device adjacent on the downstream side, for example, each display device is provided with a plurality of communication interfaces having different operating frequencies,
- the central processing unit 207 may select a communication interface suitable for the downstream display device.
- FIG. 13 shows a system configuration diagram of the second embodiment of the present invention.
- the second embodiment is different from the first embodiment in that each display device uses one antenna and wirelessly communicates with the server 101 or another display device.
- FIG. 14 shows a schematic block configuration diagram of the display devices 102, 103, and 104 in the second embodiment.
- the display device of the second embodiment includes, for example, one interface of IEEE802.11a and one interface of IEEE802.11b.
- the display device 102 which directly communicates with the server 101, switches (in a time-division manner) the communication with the server 101 and the communication with the other display device 103 in time.
- the other display devices 103 and 104 are different from the first embodiment in that communication with the upstream display device and communication with the downstream display device are performed in a time-division manner. '
- the present invention by connecting a plurality of display devices sequentially by a wireless communication method, it is not possible to directly communicate with the video distribution server due to the presence of a display device located far from the video distribution server or a shield. Distribution of an image to a display device at a position becomes possible.
- each of the display devices has a wireless communication function with a portable information terminal, and wireless communication with different frequency bands is used for communication with a server or another display device and communication with a portable information terminal.
- a wireless communication system with a higher frequency and larger communication capacity than communication with a portable information terminal with a small data transfer amount.
- smooth communication that avoids information interference becomes possible.
- two display devices when communicating with a server or another display device in one frequency band, two display devices can communicate with another display device in another frequency band. By providing a function capable of simultaneously performing wireless communication in a frequency band, a large communication capacity can be secured between display devices.
- the present invention can be used when a distribution image from a video distribution server is displayed on a plurality of display devices.
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- Computer Networks & Wireless Communication (AREA)
- General Engineering & Computer Science (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
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Abstract
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Application Number | Priority Date | Filing Date | Title |
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JP2004567563A JP4469285B2 (ja) | 2003-01-27 | 2003-09-30 | 映像表示システム及び映像表示装置 |
US10/539,750 US20060059528A1 (en) | 2003-01-27 | 2003-09-30 | Video display system and video display device |
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JP2003016874 | 2003-01-27 | ||
JP2003-016874 | 2003-01-27 |
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CN104320695A (zh) * | 2014-09-18 | 2015-01-28 | 四川长虹电器股份有限公司 | 基于智能电视和移动设备的家庭社交方法及系统 |
JP2016225744A (ja) * | 2015-05-28 | 2016-12-28 | 株式会社リコー | 無線通信システム及び方法 |
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Also Published As
Publication number | Publication date |
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JP2010045839A (ja) | 2010-02-25 |
JPWO2004068859A1 (ja) | 2006-05-25 |
US20060059528A1 (en) | 2006-03-16 |
JP4469285B2 (ja) | 2010-05-26 |
JP4988809B2 (ja) | 2012-08-01 |
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