JP6368004B2 - projector - Google Patents

Description

  The present invention relates to a video display device.

  In order to control a projection display apparatus such as a liquid crystal projector, a system for connecting and controlling a portable terminal has been proposed in addition to a configuration for transmitting commands and data by connecting to a PC (Personal Computer). For example, Patent Document 1 discloses a configuration in which a liquid crystal projector is controlled by connecting a PDA (Personal Digital Assistance) and a liquid crystal projector, and transmitting and receiving data between the two via a wireless LAN.

JP 2003-324494 A

  In recent years, smartphones (multi-function mobile phones) and tablet terminals have become widespread as portable terminals, while liquid crystal projectors are also portable and miniaturized so that images can be output anywhere. Therefore, a usage mode in which image data of the mobile terminal is displayed on the screen or the like from the liquid crystal projector by linking such a mobile terminal and the liquid crystal projector is assumed.

  In this case, there are problems that the connection between the portable terminal and the liquid crystal projector is troublesome and that it is difficult to select and connect a plurality of portable terminals. For example, when connecting a smartphone and a liquid crystal projector with a wireless LAN (for example, Wi-Fi connection: Wi-Fi Alliance wireless connection standard), an SSID (Service Set Identifier) or security password that is the identifier of the access point that is the relay point is used. Must be entered. Also, since there is only one wireless connection to the liquid crystal projector, it has been difficult to directly connect to the projector from a plurality of mobile terminals and freely switch and display the video of the mobile terminal with the projector.

  An object of the present invention is to provide a video display device that can be easily wirelessly connected to a mobile terminal and can display video by switching freely from a plurality of mobile terminals.

  The present invention is a video display device that displays an image input from an external device by connecting to the external device, the external device including a mobile terminal, and a wireless transmission method without using a relay station with the mobile terminal Can be directly connected to the external device, and has a proximity communication unit that transmits and receives device information of the video display device to and from the external device, and transmits and receives device information by holding or touching the external device over the proximity communication unit And

  Further, the present invention is a video display device that displays a video input from an external device by connecting to a plurality of external devices, the external device including a mobile terminal, and the mobile terminal does not pass through a relay station A direct connection is possible by a wireless transmission method, and a wireless signal input unit for selecting and connecting an external device that displays an image from a plurality of external devices is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the video display apparatus which can be wirelessly connected easily with a portable terminal and can switch and display the image | video from several portable terminals freely is realizable.

1 is an external view of a projection display apparatus according to an embodiment. The internal block diagram of a projection type video display apparatus. The figure explaining the touch function by a portable terminal. The flowchart which shows the connection procedure of the portable terminal using a touch function. The figure which shows the example of a connection switch with a portable terminal (Miracast / access point). The figure which shows the example of a connection switching with a portable terminal (select from several portable terminals). The figure which shows the example of a connection switching with a portable terminal (display of multiple images). The flowchart which shows the procedure which selects and switches one of several portable terminals. The figure which shows the example of installation of a projection type video display apparatus (desktop projection). The figure which shows the example of installation of a projection type video display apparatus (screen projection).

  Embodiments of the present invention will be described below with reference to the drawings. A liquid crystal projector (also simply referred to as a projector) will be taken as an example of a projection display apparatus. A mobile terminal is assumed to be a smartphone or a tablet.

  FIG. 1 is an external view (side view) of the projection display apparatus of this embodiment. (A) shows a state where the reflection mirror 9 of the liquid crystal projector 1 is closed, and (b) shows a state where the reflection mirror is opened. The projector 1 is assumed to be an ultra-short projection liquid crystal projector, for example. In order to realize ultra-short projection, a reflection mirror 9 that reflects the image light beam emitted from the projection lens and projects it onto the projection surface (screen) is housed on the upper surface of the projector 1. Project the image to the side.

The projector 1 includes a proximity communication unit 10 that transmits and receives information while holding a portable terminal (smart phone, tablet, etc.) 2 and a wireless signal input unit 20 that wirelessly inputs a video signal from the portable terminal 2. An NFC tag having an NFC (Near Field Communication) function is embedded in the near field communication unit 10. The NFC function has a communication distance of about 10 cm, and can perform data communication of device information simply by holding or touching between devices (hereinafter also referred to as a touch function). The wireless signal input unit 20 can receive video signals from a plurality of portable terminals 2 by a Miracast method (Wi-Fi CERTIFIED Miracast ^™ : a wireless video transmission method operating on Wi-Fi Direct). And the input video signal is projected and displayed (hereinafter also referred to as an input selection function). The proximity communication unit 10 and the wireless signal input unit 20 are provided on the inner side of the casing so as not to disturb the opening / closing operation of the reflection mirror 9.

  FIG. 2 is an internal configuration diagram of the projection display apparatus. Here, only a new functional part of the projector 1 of this embodiment is shown, and an optical system and a mechanism system are omitted. The near field communication unit 10 is provided with an antenna 11 and an NFC tag 12 in order to realize a touch function. The NFC tag 12 includes an RFID element 13 and transmits and receives data (device information) in a non-contact manner by electromagnetic coupling of both antenna coils provided in the projector 1 and the portable terminal 2. Data to be transmitted / received is stored in the first memory 15, and data writing / reading is switched by the changeover switch 14. Similarly, the portable terminal 2 has an NFC tag. By configuring the proximity communication unit 10 with the NFC tag 12 in this manner, the portable terminal 2 and the projector 1 can be easily connected (pairing, authentication, etc.), and data can be transferred.

The wireless signal input unit 20 can receive video signals from a plurality of portable terminals 2 and selects one of the terminals. At that time, for the video transmission between each portable terminal 2 and the projector 1, the Miracast method (Wi-Fi CERTIFIED Miracast ^TM ), which is a display transmission technology based on one-to-one wireless communication, formulated by Wi-Fi Alliance is used. adopt. The wireless signal input unit 20 includes an antenna 21, an RF chip 22, an AP chip (application processor such as a mobile processor or a multimedia processor) 23, and a third memory 24. The third memory 24 stores data such as the IP address, subnet mask, and password of the AP chip 23 necessary for wireless connection. In the input selection operation, when a selection signal is sent to the control signal input terminal 26 by a remote controller or the like, the CPU 17 sends a control signal to the AP chip 23, and the AP chip 23 selects an input signal from a desired terminal. The image processing circuit 25 processes the selected video signal and projects an image through the projection lens. The second memory 16 stores data for setting the operation of the projector 1 and the like. According to the Miracast method, devices can be directly connected to each other without a router or an access point, and video data can be sent from a portable terminal to a projector for playback. Further, since the Miracast method operates on the conventional Wi-Fi, there is an advantage that transmission is possible even when the distance between devices is relatively long.

Hereinafter, a new function using the projection display apparatus of the present embodiment will be described.
FIG. 3 is a diagram for explaining a touch function by the mobile terminal. The proximity communication unit 10 of the projector 1 has an NFC function. By touching (or holding the portable terminal 2) on the proximity communication unit 10 of the projector 1, device information is transmitted and received between the two. Thereby, the portable terminal 2 can perform wireless connection setting (pairing process) with the touched projector 1. Furthermore, by sending the setting information of the projector 1 from the portable terminal 2 to the projector 1, the operation setting of the projector 1 can be easily performed. In this case, the projector 1 temporarily writes the received setting condition data in the first memory 15 and further transfers it to the second memory 16, so that the CPU 17 performs the operation setting of the projector 1. At that time, the projector 1 specifies the security authentication password received from the portable terminal 2 by writing it into the first memory 15 and confirming whether or not it matches the password registered in advance in the second memory 16. It is also possible to prevent communication with devices other than mobile terminals.

  On the other hand, the projector 1 reads the operation information and failure information of the projector 1 stored in the second memory 16 and temporarily transfers them to the first memory 15. The portable terminal 2 acquires operation information of the projector 1 from the first memory 15 by the NFC function. The portable terminal 2 easily performs maintenance work (lamp replacement, filter replacement, etc.) of the projector 1 by reporting the obtained operation information and failure information of the projector 1 to the maintenance / service company 7 via the Internet 6. be able to.

FIG. 4 is a flowchart showing a connection procedure of the portable terminal using the touch function.
In step S <b> 101, the CPU 17 of the projector 1 communicates with the AP chip 23, reads wireless connection data (IP address, subnet mask, password, etc.) from the third memory 24 and writes it in the first memory 15.

  In step S102, the portable terminal 2 having the NFC function is touched on the projector 1. In step S103, the portable terminal 2 reads connection data (IP address, etc.) stored in the first memory 15 from the antenna 11 of the projector 1 by a touch operation.

  In step S104, the mobile terminal 2 performs wireless connection setting based on the read connection data. In step S105, pairing is established between the portable terminal 2 and the projector 1.

  5A to 5C are diagrams illustrating examples of connection switching between the portable terminal and the projector.

  FIG. 5A shows the case of switching between infrastructure connection and Miracast connection. In the conventional infrastructure connection, the PC 3 and the projector 1 communicate with each other via the access point 4. On the other hand, in the Miracast connection, the portable terminal 2 and the projector 1 are directly connected without the access point 4. Note that the Wi-Fi Direct method can be connected without the access point 4 in the same manner instead of the Miracast connection. By operating the remote controller 8 or the like, the radio signal input unit 20 of the projector 1 can select a connection with a desired device (PC3 / mobile terminal 2).

  FIG. 5B shows a case where one mobile terminal is selected and switched from a plurality of mobile terminals. Each of the mobile terminals 2a to 2c and the projector 1 can be directly connected by the Miracast method. When switching the connection, for example, a switching command is sent from the PC 3 to the projector 1 via the access point 4. The wireless signal input unit 20 of the projector 1 selects a desired terminal, connects by a Miracast method, and displays the video. Such a usage pattern is suitable when, for example, a plurality of students respond by operating a mobile terminal in a school or the like, and a teacher operates a PC to select one student and display the response on the projector 1. .

  FIG. 5C shows a case where videos from a plurality of portable terminals are simultaneously displayed on the same screen. Each of the portable terminals 2a to 2d and the projector 1 can be directly connected by the Miracast method. The wireless signal input unit 20 of the projector 1 sequentially switches the wireless connection with each portable terminal, captures the images A to D, and displays them on the same screen 5 as a multi-screen (preview screen). Thereby, videos from a plurality of portable terminals can be displayed on a single screen, or a desired image can be easily searched from a plurality of images.

  FIG. 6 is a flowchart illustrating a procedure for selecting and switching one of a plurality of portable terminals. Here, assuming the example of FIG. 5B, a case where the terminal 2c is selected from the portable terminals 2a to 2c and switched to the Miracast connection will be described.

  In step S <b> 201, the plurality of mobile terminals 2 a to 2 c are sequentially connected to the projector 1 by Wi-Fi Direct. In step S202, the projector 1 is a Wi-Fi Direct group owner. In other words, the projector 1 is a device that performs the function of an access point among devices connected by Wi-Fi Direct. In step S203, the PC 3 and the projector 1 are connected via the access point 4.

  In step S204, the PC 3 instructs the projector 1 to perform a Miracast connection with a predetermined portable terminal, for example, the portable terminal 2c. In response to this, the wireless signal input unit 20 (AP chip 23) of the projector 1 selects the mobile terminal 2c and performs Miracast connection. In step S205, the instructed portable terminal 2c outputs a video signal to the projector 1 by the Miracast method. The projector 1 displays the video received from the mobile terminal 2c.

  In step S206, after displaying a desired image on the projector 1, the PC 3 instructs the projector 1 to disconnect the Miracast connection. In step S207, the designated portable terminal 2c stops the Miracast connection with the projector 1 and stops the video output.

  In step S208, it is determined whether or not the connection with the portable terminal is switched to another terminal. When switching, it returns to step S204 and performs Miracast connection with another portable terminal. When not switching, it progresses to step S209. In step S209, the Wi-Fi Direct connection between the mobile terminals 2a to 2c and the projector 1 is released.

  7A and 7B are diagrams illustrating an installation example of the projection display apparatus. Both are suitable for an ultra-short projection type projector.

  FIG. 7A shows a case of desktop projection, where the projector 1 is placed vertically on the desk, and the desk top surface 5 ′ is regarded as a screen to display an image. For example, it is suitable for a conference surrounding a table, and the conference person can operate the portable terminal 2 at hand to display an image.

  FIG. 7B shows a screen projection in which an image is displayed on an upright screen 5 with the projector 1 placed in a stationary state. Suitable for ordinary presentations, the presenter can explain while monitoring the video with the mobile terminal 2 in one hand (mirroring function). Further, the short projection type projector is effective in that the conference person or the presenter is close to the projector and the conference person or the presenter can easily use the NFC touch function.

  As described above, according to the present embodiment, there is an effect that the portable terminal and the projection display apparatus can be easily connected to each other wirelessly, and images from a plurality of portable terminals can be freely switched and displayed on the projection display apparatus. . This greatly improves the usability of the projection display apparatus. In the present embodiment, the description is based on the wireless video transmission standard Miracast established by Wi-Fi Alliance. However, the same effect can be obtained with other wireless video transmission systems using Wi-Fi Direct connection.

1: Projection-type image display device (liquid crystal projector),
2: Mobile terminal (smartphone, tablet),
3: Personal computer (PC),
4: Access point,
5: Projection surface (screen),
6: Internet,
7: Maintenance / service company,
8: Remote control
9: reflection mirror,
10: Proximity communication unit,
11: Antenna,
12: NFC tag,
13: RF circuit,
14: changeover switch
15: first memory,
16: second memory,
17: CPU,
20: Radio signal input unit,
21: Antenna,
22: RF chip,
23: AP chip,
24: Third memory,
25: Image processing circuit,
26: Control signal input terminal.

Claims (5)

A projector for connecting a mobile terminal and projecting an image input from the mobile terminal,
A proximity communication unit that transmits and receives device information of the projector to and from the portable terminal by proximity communication;
A wireless communication unit that can be directly connected to the portable terminal without using a relay station by a wireless transmission method different from the proximity communication
The device information includes setting information for directly connecting the projector and the mobile terminal by the wireless transmission method, and operation information of the projector ,
The device information is transmitted / received by holding or touching the portable terminal over the proximity communication unit, and performing pairing processing with the portable terminal using the setting information,
When the pairing process is performed on a plurality of portable terminals and direct connection to each of the plurality of portable terminals becomes possible, the direct connection is performed according to an instruction from an external device via an access point. projector, characterized in that selects a mobile terminal connected the projector directly out of the plurality of mobile terminals capable to project an image which is input from the selected mobile terminal. The projector according to claim 1,
The projector characterized in that the device information includes operation setting information of the projector . The projector according to claim 1,
The projector characterized in that the operation information further includes filter information of the projector . The projector according to claim 1,
The pre-operation information further includes lamp information of the projector . The projector according to claim 1,
The projector characterized in that the operation information further includes failure information of the projector .

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