KR100689385B1 - Wireless display apparatus and a method for exchanging data thereof - Google Patents

Abstract

The present invention provides a wireless display device comprising: establishing a link with at least one wireless display device to transmit an image frame including image data to a wireless display device having a link established thereon, and a control frame for the image frame from the wireless display device. Is received, the mobile terminal generates and transmits an image frame according thereto, and when a link is established with the mobile terminal in response to a link setting request from the mobile terminal, the mobile terminal receives the image frame from the mobile terminal and receives image data of the image frame. And a wireless display device for generating a control frame according to the input control command and transmitting the generated control frame to the portable terminal when the user's control command for the image data is input. Accordingly, the present invention provides a wireless display device and a method for performing two-way data communication with a mobile terminal, thereby enabling various applications for video control.

Display, LCD, Display, Video, Mobile Terminal

Description

Wireless display device and data exchange method of the device {WIRELESS DISPLAY APPARATUS AND A METHOD FOR EXCHANGING DATA THEREOF}

1 is a block diagram showing a configuration for outputting an image of a conventional portable terminal

2 is a diagram illustrating an interactive data exchange between a wireless display device and a mobile terminal according to an exemplary embodiment of the present invention.

3 is a block diagram illustrating an internal configuration of a wireless display device according to an exemplary embodiment of the present invention.

4 is an internal block diagram of an RF module of a mobile terminal according to an exemplary embodiment of the present invention.

5A is a frame diagram illustrating an internal structure of a control frame according to an embodiment of the present invention.

5B is a frame diagram illustrating an internal structure of an image frame according to an embodiment of the present invention.

6 is a flowchart illustrating a link establishment and data exchange process for bidirectional communication between a wireless display device and a portable terminal according to an exemplary embodiment of the present invention.

The present invention relates to a display device, and more particularly, to a wireless display device in which image information of a mobile terminal is displayed and a data exchange method thereof.

As the functions of the portable terminal have advanced, functions beyond the wireless communication such as a camera function and a multimedia playback function have been added to the portable terminal beyond simple wireless communication means. Such multimedia functions are being gradually expanded by improving display windows of mobile terminals and realizing high-speed communication, and they are intended to be used as ultimate portable entertainment systems. Among the multimedia functions, the camera function and the multimedia playback function are the most popular advanced functions, and the quality of the screen is high enough to allow shooting with the camera and to watch video on video (VOD).

However, the mobile terminal itself is intended to be used for moving and making phone calls using the mobile communication function as a main function, and thus a display device provided with video and various additional services is limited to the size of the liquid crystal display of the terminal itself. Therefore, in the home where there is little movement, the liquid crystal display will not frequently use the additional function by using the small portable terminal, and there is a problem that only the function of the telephone is used.

FIG. 1 is a block diagram illustrating an image output of a conventional mobile terminal. The processor 100 performs an image processing operation for communication and image output, and buffers the image data output from the processor 100. A frame buffer 102, a liquid crystal display driver 104 for driving the image data output through the frame buffer 102 through a liquid crystal display device, and a liquid crystal display driver 104. And an LCD (Liquid Crystal Display) display 106, which is a liquid crystal display device that is driven by and displays digital image data.

As described above, the conventional portable terminal is configured to output an image through a liquid crystal display device embedded therein. However, the liquid crystal display device has a liquid crystal display of a predetermined size or more due to problems of portability, manufacturing cost, and power consumption of the terminal. The device could not be built.

In addition, the trend of technological development is to ensure a high-resolution color screen output using a liquid crystal display device such as an LCD (Liquid Crystal Display), and a lot of games for a mobile terminal using a high-resolution screen output has appeared. However, there is a problem in that the screen of the narrow liquid crystal display device built in the conventional portable terminal does not satisfy the user's desire by narrowing and sharpening the user's vision.

In particular, since the processor 102 and the liquid crystal display (LCD display) 106 are designed on the premise of wired connection, there is a limit in increasing the size of the liquid crystal display device 106, and the limited display area is connected to the Internet using a mobile communication terminal. There are limitations in using the web, surfing the web, and using e-mail.

In order to solve the above problem, the main unit, i.e., the processor and the liquid crystal display device are separated to perform a near field communication (RF communication) so that a predetermined image is displayed on the wireless liquid crystal display device. There was an invention (domestic application number: 10-2000-40086). However, the present invention has the following problems.

 First, the conventional invention merely takes a serial data communication scheme in which the main unit unilaterally transmits predetermined image data to the wireless liquid crystal display in the form of RF serial data, and both data is provided between the main unit and the wireless liquid crystal display. It does not present a communication plan. That is, the conventionally applied invention has a directional structure capable of transmitting and receiving data only in a specific direction, and thus, a problem in that control data such as image selection cannot be transmitted to the main unit in the wireless liquid crystal display, that is, a problem in which bidirectional communication is not made. there was.

Second, in the related art, since the serial communication is performed between the mobile communication terminal and the wireless liquid crystal display device, a 1: N (point-to) connection is performed for connecting a plurality of wireless liquid crystal display devices to the mobile communication terminal. -Multipoint) There was a problem that can not implement communication.

Third, the conventional wireless liquid crystal display device does not include a key input unit such as a keypad or a touch panel, so that a user may not directly control an image by operating a keypad of the wireless liquid crystal display device.

Accordingly, an object of the present invention is to provide a wireless display device capable of performing two-way data communication with a mobile terminal and a data exchange method of the device.

The present invention also provides a wireless display device capable of performing 1: N (point-to-multipoint) multi-communication between a mobile terminal and at least one wireless display device and a data exchange method of the device.

In order to achieve the above object, the present invention provides a wireless display device comprising: establishing a link with at least one wireless display device to transmit a video frame including image data to a wireless display device having a link established therefrom; When a control frame for an image frame is received, the mobile terminal generates and transmits an image frame according thereto, and when a link is established with the portable terminal in response to a link setting request of the portable terminal, the image frame is received from the mobile terminal. And a wireless display device for displaying the image data of the image frame and generating a control frame according to the input control command when the user's control command is input to the image data.

In another aspect, the present invention provides a method for a mobile terminal to exchange data with at least one wireless liquid crystal display device, the mobile terminal registers a unique ID of at least one wireless display device, and if the user has a link setting request, Wirelessly radiating a link request frame including a unique ID; and when a link request approval frame is transmitted from a predetermined wireless display device having the unique ID and a link is established, an image frame including image data is transmitted to the wireless liquid crystal device. And when the control frame for the image frame is transmitted from the wireless display device, generating an image frame according to the transmitted control frame and transmitting the image frame to the wireless display device.

In addition, the present invention provides a data exchange method of a wireless display device for receiving and displaying an image from a predetermined portable terminal, when a link request frame is received from the portable terminal to transmit a frame to approve the link request to the portable terminal to link Setting the image, displaying a video data included in the received video frame when a predetermined video frame is received from the mobile terminal having a link set, and receiving a video control command for the video data. Generating a control frame and transmitting the control frame to the portable terminal; and receiving the image frame generated based on the control frame from the portable terminal and displaying the corresponding image data.

DETAILED DESCRIPTION Hereinafter, detailed descriptions of preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the same components in the figures represent the same numerals wherever possible.

In the following description, specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent to those skilled in the art that the present invention may be readily implemented by variations of these detailed descriptions.

2 is a view illustrating an interactive data exchange between a wireless display device and a portable terminal according to an exemplary embodiment of the present invention. In the embodiment of the present invention, it will be assumed that the wireless display device is a wireless liquid crystal display device.

The mobile terminal 400 and the wireless display device 300, for example, the wireless liquid crystal display 300 each include an RF module for mutual data exchange. Hereinafter, an RF module provided in the mobile terminal 400 may be used as a terminal RF module 420. The RF module provided in the wireless liquid crystal display 300 will be referred to as an LCD RF module 320.

The mobile terminal 400 transmits an image frame including image data through the terminal RF module 420. In addition, when the mobile terminal 400 receives a control frame including control data such as image selection or image magnification transmitted from the LCD RF module 320 of the wireless liquid crystal display device 300, the portable terminal 400 generates an image frame according to the wireless liquid crystal. The display device 300 transmits.

Similarly, the wireless liquid crystal display 300 receives an image frame transmitted from the terminal RF module 420 through the LCD RF module 320 and transmits a predetermined control frame to the terminal RF module 420.

The image frame includes a header area storing basic information for wireless communication and a data area storing image data to be transmitted, and the control frame includes a header area storing basic information for wireless communication and control data by a user request. It includes a data area to be stored.

      The portable terminal 400 establishes a link with at least one wireless liquid crystal display device 300 to transmit an image frame including image data to the wireless liquid crystal display device 300 in which the link is established, and the wireless display device 300. When the control frame for the video frame is received from the video frame is generated and transmitted accordingly.

Wireless communication (RF communication) between the terminal RF module 420 and the LCD RF module 320 requires a data transmission speed of 50 Mbps or more in order to ensure the image transmission speed and efficiency, which is various transmission methods (for example, W-LAL method). ) Can be implemented.

Meanwhile, the portable terminal 400 and the wireless liquid crystal display 300 each have a unique identity for mutual recognition, and the portable terminal 400 and the wireless liquid crystal display 300 have these unique IDs. It recognizes each other and establishes a wireless communication link. Accordingly, one portable terminal 400 may select a plurality of wireless liquid crystal display devices 300 or any one of the wireless liquid crystal display devices 300 from among the wireless liquid crystal display devices 300 and use them as an external display.

3 is a block diagram illustrating an internal configuration of a wireless display device according to an exemplary embodiment of the present invention.

The illustrated wireless liquid crystal display 300 includes a display unit 308, an LCD control unit 302, a power supply unit 310, a key input unit 312, and an LCD RF module 320.

The display unit 308 includes an LCD driver 304 and an LCD 306. The LCD driver 304 is a driver that controls the LCD so that an image is displayed on the LCD 306. Setting values and control for driving the LCD I have data

The power supply unit 310 performs a function of providing power to the wireless liquid crystal display 300, and preferably includes a charging module for charging.

The key input unit 312 is an interface for receiving a command from a user and includes an input unit such as a keypad, a touch panel, and the like. Accordingly, the user may input a predetermined control command through the key input unit 312 for the image control required from the image displayed on the LCD 306.

The LCD controller 302 controls the overall operation of the wireless liquid crystal display 300 according to the exemplary embodiment of the present invention. In addition, the LCD controller 302 generates a control frame when a user's image control command is input through the key input unit 312, and transmits the generated control frame to the mobile terminal 400 through the LCD RF module 420. To control.

For example, if a user inputs a control command to repeatedly view, stop, or enlarge a specific image among the images displayed on the display unit 308 to the key input unit 312, the LCD control unit 302 receives the received command. The control frame is generated and transmitted to the mobile terminal 400 through the LCD RF module 320. The mobile terminal 400 extracts a control command from the transmitted control frame, performs a corresponding control, generates an image frame, and transmits the image to the wireless liquid crystal display 300.

Meanwhile, the LCD RF module 320 performs interactive communication with the mobile terminal 400, receives an image frame including image data from the mobile terminal 400, and transmits image control data to the mobile terminal 400. LCD encoding unit 322, LCD decoding unit 324, LCD transmitting buffer 326, LCD receiving buffer 328, LCD transmitting end 330, LCD receiving end 332, LCD synchronization to transmit the included control frame The part 334 is provided.

The LCD encoding unit 332 performs a function of generating a control frame for improving the wireless transmission efficiency to the outside. That is, the LCD encoding unit 332 generates a control frame by adding a header such as a unique identity to the control data to be transmitted.

The LCD transmission buffer 326 is a buffer for temporarily storing the control frame for wireless transmission of the control frame output through the LCD encoding unit.

An example of the control frame is shown in FIG. 5 (a). 5 (a) is a frame diagram showing the internal structure of a control frame according to an embodiment of the present invention.

Referring to FIG. 5 (a), the control frame is largely composed of a header sector 510 and a data sector 520, which communicate with the portable terminal 400 and the wireless liquid crystal display 300. A communication protocol identifier 512 indicating a protocol and a frame type, a unique ID 514 (hereinafter referred to as a terminal ID) of the mobile terminal, and a unique ID 516 of the wireless liquid crystal display 300 to receive a transmission frame. ID field) is stored, and the data sector 520 is a field for storing control data 522, that is, a control command received from a user.

In the above description, the terminal ID 514 is a mobile terminal identification number such as an ESN. The terminal ID 514 is a terminal unique ID determined at the time of manufacturing the terminal. The LCD ID 516 is determined at the time of manufacturing the wireless liquid crystal display, such as the ESN of the terminal. A unique ID of the wireless liquid crystal display 300.

The LCD synchronizer 334 performs the function of the wireless liquid crystal display 300 to synchronize synchronization for wireless communication (RF communication) with the outside. Accordingly, the LCD synchronizer 334 generates a reference clock for wireless communication transmission and reception from the system clock to perform synchronization through the mixer 170.

The LCD transmitter 330 performs a function of wirelessly radiating the synchronized control frame to the outside, and the LCD receiver 332 receives an image frame from an external portable terminal 400 to the LCD receiver buffer 328. Save it. Accordingly, the LCD transmitter 330 and the LCD receiver 332 carry data by carrying a frame on a specific communication channel (eg, 2.5 GHz band) with the terminal RF module 420 of the portable terminal.

The LCD decoding unit 324 decodes the image frames sequentially received from the LCD receiving buffer 326 and transmits the extracted image data to the LCD control unit 302 together with the relevant header information.

4 is a block diagram illustrating an internal configuration of an RF module of a mobile terminal according to an exemplary embodiment of the present invention.

4 illustrates only components necessary for implementing an embodiment of the present invention among general internal building blocks of the mobile terminal.

The illustrated mobile terminal 400 includes a terminal controller 402 and a terminal RF module 420. Although not illustrated, the portable terminal may include an input unit (not shown) for requesting a user to establish a link with a predetermined liquid crystal display.

The terminal controller 402 controls the overall operation of the portable terminal 400.

The terminal controller 402 registers a unique ID of the at least one wireless liquid crystal display 300, and controls to wirelessly radiate a link request frame including the unique ID when a link setting request of the user is requested.

In addition, the terminal controller 402 transmits an image frame including image data to the wireless liquid crystal display 300 when the link request approval frame is transmitted from the predetermined wireless liquid crystal display 300 having the unique ID and the link is established. To control.

When the control frame for the image frame is received from the wireless liquid crystal display device 300, the controller 402 generates an image frame according to the control frame and transmits the image frame to the wireless liquid crystal display device 300.

The terminal RF module 420 performs the same function as each functional unit of the LCD RF module 320 shown in FIG. 3, and the terminal RF module 420 includes a terminal encoding unit 422 and a terminal decoding unit 424. And a terminal transmission buffer 426, a terminal reception buffer 428, a terminal transmission end 430, a terminal reception end 432, and a terminal synchronization unit 434.

The operation of each functional unit is performed by the LCD encoding unit 322, the LCD decoding unit 324, the LCD transmitting buffer 326, the LCD receiving buffer 328, the LCD transmitting end 330, and the LCD receiving end 332 of each wireless LCD. ), The LCD synchronizer 334 and the like each perform the same function. In particular, the terminal encoder 422 generates an image frame encoding image data to be transmitted to the LCD RF module.

An example of the image frame is shown in FIG. 5B. 5B is a frame diagram illustrating an internal structure of an image frame according to an embodiment of the present invention.

Referring to FIG. 5 (b), the image frame is largely composed of a header sector 550 and a data sector 560. The header sector 550 includes a communication protocol identifier 552 and a unique ID 554 of the mobile terminal. ), And the compressed image data 562 stored in the data sector 560 is generated by compressing the image data to be transmitted. The compression method includes various compression algorithms such as MPEG. Can be applied.

6 is a flowchart illustrating a link establishment and data exchange process for bidirectional communication between a wireless display device and a portable terminal according to an exemplary embodiment of the present invention.

First, the mobile terminal 400 registers an LCD ID which is a unique ID of at least one wireless liquid crystal display 300 in order to display an image using the wireless liquid crystal display 300 (S605). In the LCD ID registration process (S602), when the mobile terminal 400 and the wireless liquid crystal display device 300 are manufactured and sold together, the manufacturer may register a unique ID of the wireless liquid crystal display device 300 in the mobile terminal in advance. However, if the user wants to use another separate wireless liquid crystal display 300, the unique ID (LCD ID) of the wireless liquid crystal display 300 to be used by the user may then be registered and used in the portable terminal. In this case, the mobile terminal 400 preferably provides a user with a registration manual for registering a unique ID of the wireless liquid crystal display 300.

After registering the unique ID of the wireless liquid crystal display 300, the portable terminal 400 may exchange data with the wireless liquid crystal display 300 having the registered unique ID until the registration is released.

The mobile terminal 400 checks whether there is a link setting request from the user (S610).

The mobile terminal 400 wirelessly emits a link request frame including the unique ID when a user establishes a link setting request (S615).

When a predetermined link request frame is received (S620), the wireless liquid crystal display 300 reads a unique ID included in the received link request frame (S625).

The wireless liquid crystal display 300 checks whether the read unique ID matches a unique eye previously stored in the wireless liquid crystal display 300 (S630).

If the read unique ID matches a pre-stored unique ID, the wireless liquid crystal display 300 sets a link by transmitting a frame approving the link request to the portable terminal 400 (S635). That is, the wireless liquid crystal display 300 may read the LCD ID of the emitted link request frame to know that the destination of the emitted link request frame is itself.

The mobile terminal 400 transmits the image frame including the predetermined image data to the wireless liquid crystal display 300 when the link request approval frame is transmitted from the wireless liquid crystal display 300 having the unique ID and the link is established. (S640).

When a predetermined image frame is transmitted, the wireless liquid crystal display 300 extracts and displays image data included in the transmitted image frame (S645).

The wireless liquid crystal display 300 checks whether a user's image control command is input to the displayed image data (S650). The image control command may be a repeat play command, a stop command, an enlarge command, and the like of the displayed image.

When the image control command is input, the wireless liquid crystal display 300 generates a control frame according to the input control command (S655).

The wireless liquid crystal display 300 transmits the generated control frame to the mobile terminal 400 (S660).

When the control frame is transmitted from the wireless liquid crystal display 300, the portable terminal 400 generates an image frame according to the transmitted control frame (S665), and transmits the generated image frame to the wireless liquid crystal display 300. (S670).

The wireless liquid crystal display 300 receives the generated image frame and displays corresponding image data in operation S675.

Meanwhile, in the above-described embodiments of the present invention, the portable terminal and the wireless liquid crystal display device perform one-to-one communication (point-point), but one mobile terminal attempts to transmit the same image to a plurality of wireless liquid crystal display devices. In this case, multi-communication, that is, 1: N (point-to-multipoint) communication may be performed.

To this end, the portable terminal can insert a plurality of LCD IDs of a plurality of wireless liquid crystal display devices to be used for transmission of a link request frame to establish a link and perform data exchange with the plurality of wireless liquid crystal display devices.

In the above description of the present invention, a specific embodiment has been described with respect to the wireless liquid crystal display device, but it is also applicable to the display device without the liquid crystal, and various modifications can be made without departing from the scope of the present invention. Therefore, the scope of the present invention is not to be determined by the embodiments described above, but will be apparent in the claims as well as equivalent scope.

As described above, the present invention provides a wireless display device and a method capable of performing two-way data communication with a mobile terminal, thereby enabling various applications for video control.

In addition, since the present invention can perform multi-communication with a plurality of wireless display devices in one portable terminal, user convenience is increased.

Claims (21)

In a wireless display device, Set a link with at least one wireless display device to transmit an image frame including image data to a wireless display device with a link set, and generate a video frame according to the control frame for the image frame from the wireless display device. A mobile terminal for transmitting by When a link is established with the portable terminal in response to the link setting request of the portable terminal, when the image frame is received from the portable terminal, the image data of the image frame is displayed, and a user's control command for the image data is input. And a wireless display device generating a control frame according to the input control command and transmitting the control frame to the portable terminal. The portable terminal of claim 1, wherein And registering a unique ID of at least one wireless display device in advance, and wirelessly radiating a link request frame including the unique ID when a link setting request is made by a user. The method of claim 1, wherein the wireless display device A key input unit for receiving an image control command from a user; A power supply unit supplying power to the wireless display device; An LCD RF module for performing interactive communication with the portable terminal, receiving an image frame including image data from the portable terminal, and transmitting a control frame including image control data to the portable terminal; A display unit displaying image data extracted from the received image frame; And a controller configured to generate a control frame when the user inputs an image control command through the key input unit and to transmit the generated control frame to the portable terminal through the LCD RF module. . The method of claim 3, wherein the control unit And when the link request frame is received from the portable terminal, controls to establish a link by transmitting a frame approving the link request to the portable terminal. The method of claim 4, wherein the control unit When the link request frame is received, a unique ID of the received link request frame is read. When the read unique ID matches a pre-stored unique ID, a frame for approving the link request through the LCD RF module is transmitted to the mobile terminal. A wireless display device characterized by transmitting. The method of claim 3, wherein the control unit And when the image frame generated by the portable terminal is received by the LCD RF module based on the control frame, extracts image data from the image frame and displays the image data on the display unit. The method of claim 3, wherein the power supply unit And a charging module for charging power supplied to the wireless display device. The method of claim 3, wherein the LCD RF module, An LCD synchronizer for performing RF synchronization with the portable terminal; An LCD encoding unit generating a control frame by adding a header corresponding to the transmission protocol to the control data; An LCD transmitter for wirelessly radiating a control frame generated by the LCD encoder; An LCD receiver for receiving an image frame from the portable terminal; And an LCD decoding unit which extracts and decodes image data from the received image frame. The method of claim 8, An LCD transmission buffer for temporarily storing the control frame generated by the LCD encoding unit; And a LCD receiving buffer for temporarily storing the image frame received through the LCD receiving end. The method of claim 1, wherein the image frame And a header area storing basic information for wireless communication and a data area storing image data to be transmitted. The method of claim 1, wherein the control frame And a header area storing basic information for wireless communication and a data area storing control data according to a user request. 12. The method of claim 10 or 11, wherein the header area is And a communication protocol identifier for identifying a communication protocol (LCD ID), and a communication protocol (Protocol). A method of exchanging data with at least one wireless display device by a portable terminal, Registering, by the portable terminal, a unique ID of at least one wireless display device; Wirelessly radiating a link request frame including the unique ID when a user establishes a link setting request; Transmitting an image frame including image data to the wireless liquid crystal device when a link request approval frame is transmitted from the predetermined wireless display device having the unique ID and a link is established; And when the control frame for the image frame is transmitted from the wireless display device, generating an image frame according to the transmitted control frame and transmitting the image frame to the wireless display device. The method of claim 13, wherein the image frame is And a header area storing basic information for wireless communication and a data area storing image data to be transmitted. The method of claim 13, wherein the control frame And a header area storing basic information for wireless communication and a data area storing control data according to a user request. 16. The method of claim 14 or 15, wherein the header area is And a communication protocol identifier for identifying a communication protocol (LCD ID), a unique ID of the wireless display device, and a communication protocol. A data exchange method of a wireless display device for receiving and displaying an image from a predetermined portable terminal, When the link request frame is received from the portable terminal, transmitting a frame approving the link request to the portable terminal to establish a link; Displaying image data included in the received image frame when a predetermined image frame is received from the portable terminal in which the link is established; Generating a control frame according to the control command and transmitting the control frame according to the control command when the image control command of the user is input to the image data; And receiving the image frame generated based on the control frame from the portable terminal and displaying the corresponding image data. The method of claim 17, wherein the image frame And a header area storing basic information for wireless communication and a data area storing image data to be transmitted. The method of claim 17, wherein the control frame And a header area storing basic information for wireless communication and a data area storing control data according to a user request. 20. The apparatus of claim 18 or 19, wherein the header area is And a communication protocol identifier for identifying a communication protocol (LCD ID) and a communication protocol (Protocol). The method of claim 17, wherein the setting process Reading a unique ID of the received link request frame when the link request frame is received; Checking whether the read unique ID matches a unique ID previously stored in the wireless display device; And if the read unique ID matches a pre-stored unique ID, transmitting the frame approving the link request to the mobile terminal to establish a link.

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