WO2024024997A1

WO2024024997A1 - Display device and method for operating same

Info

Publication number: WO2024024997A1
Application number: PCT/KR2022/010956
Authority: WO
Inventors: 차준걸
Original assignee: 엘지전자 주식회사
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2024-02-01

Abstract

A display device according to an embodiment of the present invention comprises: a wireless communication interface wirelessly connected to an external device; and a controller which transmits, to the wireless communication interface, a token packet requesting data transmitted from the external device, wherein the controller can aperiodically transmit the token packet when the wireless communication interface is in a standby state for receiving data.

Description

Display device and method of operation thereof

This disclosure relates to a display device and a method of operating the same.

Recently, as the number of electronic devices operating wirelessly is increasing, the issue of reducing electromagnetic interference (EMI) is increasing. EMI can interfere with the operation of other electronic devices and can become a serious obstacle, such as causing malfunctions, so it is important to take measures to reduce EMI.

Meanwhile, when the display device is wirelessly connected to another external device, the wireless communication module (e.g., Wi-Fi & Bluetooth module) within the display device continuously transmits a negative acknowledgment (NAK) to the SoC in a standby state. Accordingly, the SoC transmits a request to inquire whether there is data to be sent to the wireless communication module. If these requests occur at the same cycle, electromagnetic noise is generated through the device connected to the transmission line (PCB/FFC) or another USB port. You can do it.

The present disclosure seeks to minimize electromagnetic noise caused by token packets periodically transmitted when in a standby state for wireless communication.

The present disclosure seeks to reduce electromagnetic noise while maintaining stable performance without distortion of communication signals between a controller and a wireless communication interface.

A display device according to an embodiment of the present disclosure includes a wireless communication interface that is wirelessly connected to an external device, and a controller that transmits a token packet requesting data transmitted from the external device to the wireless communication interface, and the controller has a wireless communication interface. When in a waiting state to receive data, token packets can be transmitted aperiodically.

When the controller receives a negative response to the token packet, the controller may determine the wireless communication interface to be in a standby state.

The controller may adjust the timing of transmitting the token packet based on the number of times a negative response is received.

If the number of negative responses received is an odd number, the controller sets the transmission timing of the token packet to the first timing. If the number of negative responses received is an even number, the controller sets the token packet transmission timing to the second timing, so that the token packet is aperiodic. It can be sent to .

The second timing may be longer than the first timing.

Each time a token packet is transmitted, the controller may increase or decrease the token packet transmission timing by a predetermined time to transmit the token packet aperiodically.

Whenever a negative response to a token packet is received, the controller may increase or decrease the transmission timing of the token packet by a predetermined amount of time to transmit the token packet aperiodically.

The controller may transmit a token packet based on the data when the wireless communication interface is in a data communication state receiving data.

A method of operating a display device according to an embodiment of the present disclosure includes the steps of a wireless communication interface performing a wireless connection with an external device, and a controller transmitting a token packet requesting data transmitted from the external device to the wireless communication interface. The step of transmitting the token packet may include aperiodically transmitting the token packet when the wireless communication interface is in a standby state to receive data.

The step of transmitting the token packet may further include, when the controller receives a negative response to the token packet, determining the wireless communication interface to be in a standby state.

The step of transmitting the token packet may further include adjusting the timing of transmitting the token packet based on the number of times a negative response is received.

In the step of aperiodically transmitting the token packet, if the number of negative responses received is an even number, the transmission timing of the token packet is set to the first timing, and if the number of negative responses received is an odd number, the token packet transmission timing is set to the second timing. It may include the step of aperiodically transmitting the token packet by setting it to .

The step of aperiodically transmitting the token packet may include astep of aperiodically transmitting the token packet by increasing the transmission timing of the token packet by a predetermined time each time the token packet is transmitted when the wireless communication interface is in a standby state.

The step of aperiodically transmitting the token packet includes increasing the transmission timing of the token packet by a predetermined time every time a negative response to the token packet is received when the wireless communication interface is in a standby state and aperiodically transmitting the token packet. It can be included.

Transmitting the token packet may include transmitting the token packet based on data when in a data communication state in which data is received through a wireless communication interface.

According to an embodiment of the present disclosure, there is an advantage in that electromagnetic noise can be reduced by minimizing energy concentration of radiated noise by generating token packets aperiodically while in a standby state for receiving data from an external device.

According to an embodiment of the present disclosure, there is an advantage in that electromagnetic noise can be reduced while maintaining stable performance without distortion of communication signals between the controller and the wireless communication interface by adjusting the transmission timing of the token packet.

According to an embodiment of the present disclosure, electromagnetic noise can be reduced through an algorithm that adjusts the transmission timing of token packets without modifying or adding a separate physical structure, which has the advantage of minimizing problems such as increased cost or volume.

Figure 1 shows a block diagram of the configuration of a display device according to an embodiment of the present invention.

Figure 2 is a block diagram of a remote control device according to an embodiment of the present invention.

Figure 3 shows an example of the actual configuration of a remote control device according to an embodiment of the present invention.

Figure 4 shows an example of utilizing a remote control device according to an embodiment of the present invention.

Figure 5 is a flow chart illustrating a method of operating a display device according to an embodiment of the present disclosure.

FIG. 6 is a flowchart illustrating a specific method in which a controller aperiodically transmits a token packet in a display device according to the first embodiment of the present disclosure.

FIG. 7 is a flowchart illustrating a specific method in which a controller aperiodically transmits a token packet in a display device according to a second embodiment of the present disclosure.

FIG. 8 is a flowchart illustrating a specific method in which a controller aperiodically transmits a token packet in a display device according to a third embodiment of the present disclosure.

Figure 9 is a diagram measuring the noise emission level when the transmission timing of the token packet is fixed and when it is variable.

Hereinafter, embodiments related to the present invention will be described in more detail with reference to the drawings. The suffixes “module” and “part” for components used in the following description are given or used interchangeably only for the ease of preparing the specification, and do not have distinct meanings or roles in themselves.

The display device according to an embodiment of the present invention is, for example, an intelligent display device that adds a computer support function to the broadcast reception function, and is faithful to the broadcast reception function while adding an Internet function, etc., such as a handwriting input device and a touch screen. Alternatively, it can be equipped with a more convenient interface such as a spatial remote control. In addition, by supporting wired or wireless Internet functions, it is possible to connect to the Internet and a computer and perform functions such as email, web browsing, banking, or gaming. A standardized general-purpose OS can be used for these various functions.

Accordingly, in the display device described in the present invention, for example, various applications can be freely added or deleted on a general-purpose OS kernel, so various user-friendly functions can be performed. More specifically, the display device may be, for example, a network TV, HBBTV, smart TV, LED TV, OLED TV, etc., and in some cases, may also be applied to a smartphone.

Referring to FIG. 1, the display device 100 includes a broadcast receiver 130, an external device interface 135, a memory 140, a user input interface 150, a controller 170, a wireless communication interface 173, and a microphone. 175, a display 180, a speaker 185, and a power supply circuit 190 may be included.

The broadcast receiver 130 may include a tuner 131, a demodulator 132, and a network interface 133.

The tuner 131 can select a specific broadcast channel according to a channel selection command. The tuner 131 may receive a broadcast signal for a specific selected broadcast channel.

The demodulator 132 can separate the received broadcast signal into a video signal, an audio signal, and a data signal related to the broadcast program, and can restore the separated video signal, audio signal, and data signal to a form that can be output.

The external device interface 135 may receive an application or application list within an adjacent external device and transfer it to the controller 170 or memory 140.

The external device interface 135 may provide a connection path between the display device 100 and an external device. The external device interface 135 may receive one or more of video and audio output from an external device connected wirelessly or wired to the display device 100 and transmit it to the controller 170. The external device interface 135 may include a plurality of external input terminals. The plurality of external input terminals may include an RGB terminal, one or more High Definition Multimedia Interface (HDMI) terminals, and a component terminal.

An image signal from an external device input through the external device interface 135 may be output through the display 180. A voice signal from an external device input through the external device interface 135 may be output through the speaker 185.

An external device that can be connected to the external device interface 135 may be any one of a set-top box, Blu-ray player, DVD player, game console, sound bar, smartphone, PC, USB memory, or home theater, but this is only an example.

The network interface 133 may provide an interface for connecting the display device 100 to a wired/wireless network including an Internet network. The network interface 133 may transmit or receive data with other users or other electronic devices through a connected network or another network linked to the connected network.

Additionally, some of the content data stored in the display device 100 may be transmitted to a selected user or selected electronic device among other users or other electronic devices pre-registered in the display device 100.

The network interface 133 can access a certain web page through a connected network or another network linked to the connected network. In other words, you can access a certain web page through a network and transmit or receive data with the corresponding server.

And, the network interface 133 can receive content or data provided by a content provider or network operator. That is, the network interface 133 can receive content and information related thereto, such as movies, advertisements, games, VODs, and broadcast signals, provided from a content provider or network provider through a network.

Additionally, the network interface 133 can receive firmware update information and update files provided by a network operator, and can transmit data to the Internet, a content provider, or a network operator.

The network interface 133 can select and receive a desired application from among applications open to the public through a network.

The memory 140 stores programs for processing and controlling each signal in the controller 170, and can store signal-processed video, voice, or data signals.

In addition, the memory 140 may perform a function for temporary storage of video, voice, or data signals input from the external device interface 135 or the network interface 133, and may store information about a predetermined image through a channel memory function. You can also store information.

The memory 140 may store an application or application list input from the external device interface 135 or the network interface 133.

The display device 100 can play content files (video files, still image files, music files, document files, application files, etc.) stored in the memory 140 and provide them to the user.

The user input interface 150 may transmit a signal input by the user to the controller 170 or transmit a signal from the controller 170 to the user. For example, the user input interface 150 can be used remotely according to various communication methods such as Bluetooth, Ultra Wideband (WB), ZigBee, Radio Frequency (RF) communication, or infrared (IR) communication. Control signals such as power on/off, channel selection, and screen settings can be received and processed from the control device 200, or control signals from the controller 170 can be processed to be transmitted to the remote control device 200.

Additionally, the user input interface 150 can transmit control signals input from local keys (not shown) such as power key, channel key, volume key, and setting value to the controller 170.

The video signal processed by the controller 170 may be input to the display 180 and displayed as an image corresponding to the video signal. Additionally, the image signal processed by the controller 170 may be input to an external output device through the external device interface 135.

The voice signal processed by the controller 170 may be output as audio to the speaker 185. Additionally, the voice signal processed by the controller 170 may be input to an external output device through the external device interface 135.

In addition, the controller 170 may control overall operations within the display device 100.

In addition, the controller 170 can control the display device 100 by a user command or internal program input through the user input interface 150, and connects to the network to display an application or application list desired by the user on the display device ( 100) You can make it available for download within.

The controller 170 allows channel information selected by the user to be output through the display 180 or speaker 185 along with the processed video or audio signal.

In addition, the controller 170 controls video signals from an external device, for example, a camera or camcorder, input through the external device interface 135, according to an external device video playback command received through the user input interface 150. Alternatively, the voice signal can be output through the display 180 or speaker 185.

Meanwhile, the controller 170 can control the display 180 to display an image, for example, a broadcast image input through the tuner 131, an external input image input through the external device interface 135, Alternatively, an image input through the network interface unit or an image stored in the memory 140 may be controlled to be displayed on the display 180. In this case, the image displayed on the display 180 may be a still image or a moving image, and may be a 2D image or a 3D image.

In addition, the controller 170 can control the playback of content stored in the display device 100, received broadcast content, or external input content, which includes broadcast video, external input video, and audio files. , can be in various forms such as still images, connected web screens, and document files.

The wireless communication interface 173 can communicate with external devices through wired or wireless communication. The wireless communication interface 173 can perform short range communication with an external device. For this purpose, the wireless communication interface 173 includes Bluetooth™, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, Near Field Communication (NFC), and Wi-Fi. Short-distance communication can be supported using at least one of Fi (Wireless-Fidelity), Wi-Fi Direct, and Wireless USB (Wireless Universal Serial Bus) technologies. This wireless communication interface 173 is between the display device 100 and a wireless communication system, between the display device 100 and another display device 100, or between the display device 100 through wireless area networks. It can support wireless communication between the network and the display device 100 (or external server). Local area wireless networks may be wireless personal area networks.

Here, the other display device 100 is a wearable device capable of exchanging data with (or interoperating with) the display device 100 according to the present invention, for example, a smartwatch, smart glasses. It can be a mobile terminal such as (smart glass), HMD (head mounted display), or smart phone. The wireless communication interface 173 may detect (or recognize) a wearable device capable of communication around the display device 100 .

Furthermore, if the detected wearable device is a device authenticated to communicate with the display device 100 according to the present invention, the controller 170 sends at least a portion of the data processed by the display device 100 to the wireless communication interface 173. It can be transmitted to a wearable device through . Accordingly, a user of a wearable device can use data processed by the display device 100 through the wearable device.

Microphone 175 can acquire audio. The microphone 175 can acquire audio around the display device 100.

The display 180 converts the video signal, data signal, and OSD signal processed by the controller 170 or the video signal and data signal received from the external device interface 135 into R, G, and B signals, respectively, and provides a driving signal. can be created.

Meanwhile, the display device 100 shown in FIG. 1 is only one embodiment of the present invention. Some of the illustrated components may be integrated, added, or omitted depending on the specifications of the display device 100 that is actually implemented.

That is, as needed, two or more components may be combined into one component, or one component may be subdivided into two or more components. In addition, the functions performed by each block are for explaining embodiments of the present invention, and the specific operations or devices do not limit the scope of the present invention.

According to another embodiment of the present invention, unlike shown in FIG. 1, the display device 100 does not have a tuner 131 and a demodulator 132 but has a network interface 133 or an external device interface 135. You can also receive and play video through the device.

For example, the display device 100 is divided into an image processing device such as a set-top box for receiving broadcast signals or contents according to various network services, and a content playback device for playing content input from the image processing device. It can be implemented.

In this case, the method of operating a display device according to an embodiment of the present invention, which will be described below, includes not only the display device 100 as described with reference to FIG. 1, but also an image processing device such as the separated set-top box or the display 180. ) and a content playback device having an audio output unit 185.

The speaker 185 receives the audio-processed signal from the controller 170 and outputs it as audio.

The power supply circuit 190 supplies the corresponding power throughout the display device 100. In particular, power can be supplied to the controller 170, which can be implemented in the form of a system on chip (SOC), the display 180 for displaying images, and the speaker 185 for audio output.

Specifically, the power supply circuit 190 may include a converter that converts alternating current power to direct current power and a dc/dc converter that converts the level of direct current power.

Next, with reference to FIGS. 2 and 3, a remote control device according to an embodiment of the present invention will be described.

Figure 2 is a block diagram of a remote control device according to an embodiment of the present invention, and Figure 3 shows an example of the actual configuration of the remote control device 200 according to an embodiment of the present invention.

First, referring to FIG. 2, the remote control device 200 includes a fingerprint reader 210, a wireless communication circuit 220, a user input interface 230, a sensor 240, an output interface 250, and a power supply circuit ( 260), memory 270, controller 280, and microphone 290.

Referring to FIG. 2, the wireless communication circuit 220 transmits and receives signals to and from any one of the display devices according to the embodiments of the present invention described above.

The remote control device 200 has an RF circuit 221 capable of transmitting and receiving signals to and from the display device 100 in accordance with RF communication standards, and is capable of transmitting and receiving signals to and from the display device 100 in accordance with IR communication standards. An IR circuit 223 may be provided. Additionally, the remote control device 200 may be provided with a Bluetooth circuit 225 capable of transmitting and receiving signals to and from the display device 100 according to the Bluetooth communication standard. In addition, the remote control device 200 is provided with an NFC circuit 227 capable of transmitting and receiving signals with the display device 100 according to the NFC (Near Field Communication) communication standard, and displays the display device 100 according to the WLAN (Wireless LAN) communication standard. A WLAN circuit 229 capable of transmitting and receiving signals to and from the device 100 may be provided.

In addition, the remote control device 200 transmits a signal containing information about the movement of the remote control device 200 to the display device 100 through the wireless communication circuit 220.

Meanwhile, the remote control device 200 can receive signals transmitted by the display device 100 through the RF circuit 221 and, if necessary, turn on/off the display device 100 through the IR circuit 223. Commands for turning off, changing channels, changing volume, etc. can be sent.

The user input interface 230 may be comprised of a keypad, button, touch pad, or touch screen. The user can input commands related to the display device 100 into the remote control device 200 by manipulating the user input interface 230. If the user input interface 230 has a hard key button, the user can input a command related to the display device 100 to the remote control device 200 through a push operation of the hard key button. This will be explained with reference to FIG. 3 .

Referring to FIG. 3, the remote control device 200 may include a plurality of buttons. The plurality of buttons include a fingerprint recognition button (212), power button (231), home button (232), live button (233), external input button (234), volume control button (235), voice recognition button (236), It may include a channel change button 237, a confirmation button 238, and a back button 239.

The fingerprint recognition button 212 may be a button for recognizing the user's fingerprint. In one embodiment, the fingerprint recognition button 212 is capable of a push operation and may receive a push operation and a fingerprint recognition operation.

The power button 231 may be a button for turning on/off the power of the display device 100.

The home button 232 may be a button for moving to the home screen of the display device 100.

The live button 233 may be a button for displaying a real-time broadcast program.

The external input button 234 may be a button for receiving an external input connected to the display device 100.

The volume control button 235 may be a button for adjusting the volume of the sound output by the display device 100.

The voice recognition button 236 may be a button for receiving the user's voice and recognizing the received voice.

The channel change button 237 may be a button for receiving a broadcast signal of a specific broadcast channel.

The confirmation button 238 may be a button for selecting a specific function, and the back button 239 may be a button for returning to the previous screen.

Figure 2 will be described again.

If the user input interface 230 has a touch screen, the user can input commands related to the display device 100 through the remote control device 200 by touching a soft key on the touch screen. Additionally, the user input interface 230 may be provided with various types of input means that the user can operate, such as scroll keys and jog keys, and this embodiment does not limit the scope of the present invention.

The sensor 240 may include a gyro sensor 241 or an acceleration sensor 243, and the gyro sensor 241 may sense information about the movement of the remote control device 200.

For example, the gyro sensor 241 can sense information about the operation of the remote control device 200 based on the x, y, and z axes, and the acceleration sensor 243 measures the moving speed of the remote control device 200. Information about such things can be sensed. Meanwhile, the remote control device 200 may further include a distance measurement sensor and can sense the distance from the display 180 of the display device 100.

The output interface 250 may output a video or audio signal corresponding to a manipulation of the user input interface 230 or a signal transmitted from the display device 100.

The user can recognize whether the output interface 250 is manipulating the user input interface 230 or controlling the display device 100.

For example, the output interface 250 includes an LED 251 that turns on when the user input interface 230 is manipulated or a signal is transmitted and received with the display device 100 through the wireless communication unit 225, and a vibrator 253 that generates vibration. ), a speaker 255 that outputs sound, or a display 257 that outputs an image.

In addition, the power supply circuit 260 supplies power to the remote control device 200, and stops power supply when the remote control device 200 does not move for a predetermined period of time, thereby reducing power waste.

The power supply circuit 260 can resume power supply when a predetermined key provided in the remote control device 200 is operated.

The memory 270 may store various types of programs, application data, etc. necessary for controlling or operating the remote control device 200.

When the remote control device 200 transmits and receives signals wirelessly through the display device 100 and the RF circuit 221, the remote control device 200 and the display device 100 transmit and receive signals through a predetermined frequency band. .

The controller 280 of the remote control device 200 stores and references information about the display device 100 paired with the remote control device 200 and the frequency band capable of wirelessly transmitting and receiving signals in the memory 270. You can.

The controller 280 controls all matters related to the control of the remote control device 200. The controller 280 sends a signal corresponding to a predetermined key operation of the user input interface 230 or a signal corresponding to the movement of the remote control device 200 sensed by the sensor 240 through the wireless communication unit 225. 100).

Additionally, the microphone 290 of the remote control device 200 can acquire voice.

There may be a plurality of microphones 290.

Next, Figure 4 will be described.

(a) of FIG. 4 illustrates that a pointer 205 corresponding to the remote control device 200 is displayed on the display 180.

The user can move or rotate the remote control device 200 up and down, left and right. The pointer 205 displayed on the display 180 of the display device 100 corresponds to the movement of the remote control device 200. This remote control device 200 can be called a spatial remote control because the corresponding pointer 205 is moved and displayed according to movement in 3D space, as shown in the drawing.

(b) of FIG. 4 illustrates that when the user moves the remote control device 200 to the left, the pointer 205 displayed on the display 180 of the display device 100 also moves to the left correspondingly.

Information about the movement of the remote control device 200 detected through the sensor of the remote control device 200 is transmitted to the display device 100. The display device 100 may calculate the coordinates of the pointer 205 from information about the movement of the remote control device 200. The display device 100 may display the pointer 205 to correspond to the calculated coordinates.

(c) of FIG. 4 illustrates a case where a user moves the remote control device 200 away from the display 180 while pressing a specific button in the remote control device 200. As a result, the selected area in the display 180 corresponding to the pointer 205 can be zoomed in and displayed enlarged.

Conversely, when the user moves the remote control device 200 closer to the display 180, the selected area in the display 180 corresponding to the pointer 205 may be zoomed out and displayed in a reduced size.

Meanwhile, when the remote control device 200 moves away from the display 180, the selected area may be zoomed out, and when the remote control device 200 approaches the display 180, the selected area may be zoomed in.

Additionally, when a specific button in the remote control device 200 is pressed, recognition of up-down, left-right movement may be excluded. That is, when the remote control device 200 moves away from or approaches the display 180, up, down, left, and right movements may not be recognized, and only forward and backward movements may be recognized. When a specific button in the remote control device 200 is not pressed, only the pointer 205 moves as the remote control device 200 moves up, down, left, and right.

Meanwhile, the moving speed or direction of the pointer 205 may correspond to the moving speed or direction of the remote control device 200.

Meanwhile, a pointer in this specification refers to an object displayed on the display 180 in response to the operation of the remote control device 200. Accordingly, the pointer 205 can be an object of various shapes other than the arrow shape shown in the drawing. For example, concepts may include dots, cursors, prompts, thick outlines, etc. In addition, the pointer 205 can be displayed in correspondence to one of the horizontal and vertical axes on the display 180, as well as to multiple points, such as a line or surface. .

Meanwhile, the display device 100 may perform wireless communication (eg, Wi-Fi, Bluetooth, etc.) with an external device. To this end, the wireless communication interface 173 of the display device 100 can perform a wireless connection with an external device. The wireless communication interface 173 can be wirelessly connected to an external device by performing an authentication procedure according to a predetermined procedure for each wireless communication technology. In this disclosure, it is assumed that the wireless communication interface 173 is wirelessly connected to an external device via Wi-Fi or Bluetooth.

Meanwhile, even if the display device 100 is wirelessly connected to an external device, data may not be continuously received from the external device. That is, the display device 100 can aperiodically receive data from a wirelessly connected external device. Accordingly, the wireless communication interface 173 can receive data from a wirelessly connected external device and store it in a queue (not shown). A queue (not shown) may be provided in the wireless communication interface 173 to temporarily store data transmitted from an external device.

The controller 170 implemented as a System on Chip (SoC) can transmit a token packet to the wireless communication interface 173.

A token packet may be a packet sent from a host to a device to inform the direction of data. That is, the controller 170 is a host, and the wireless communication interface 173 is a device, so that the controller 170 can transmit a token packet to the wireless communication interface 173.

The wireless communication interface 173 that has received the token packet can transmit the data to the controller 170 if there is data stored in the queue. The wireless communication interface 173 may transmit data stored in the queue to the controller 170 as a data packet. When the controller 170 receives data transmitted from an external device through the wireless communication interface 173, it can transmit an affirmative response (ACK) to the wireless communication interface 173.

On the other hand, the wireless communication interface 173 that received the token packet may transmit a negative response (NAK) to the controller 170 if there is no data stored in the queue. That is, the wireless communication interface 173 may transmit a negative response (NAK) to the controller 170 when it is in a standby state to receive data from an external device.

The controller 170 may determine the wireless communication interface 173 to be in a standby state when receiving a negative acknowledgment (NAK) for the token packet. The controller 170 may continuously transmit token packets to the wireless communication interface 173 when the wireless communication interface 173 is in a standby state.

Meanwhile, these token packets may be radiated through transmission lines (e.g., PCB, FFC, etc.) or external devices connected to other USB ports and act as radiated noise. At this time, if the token packet is periodically radiated, the energy of the radiated noise is concentrated and the noise emission level is high, so EMI (Electro Magnetic Interferenc) may become a problem. Meanwhile, when the wireless communication interface 173 is in a data communication state in which data is received from an external device, token packet changes occur depending on the data, so the noise emission level can be low.

Therefore, the present disclosure seeks to minimize EMI by having the controller 170 transmit token packets aperiodically when the wireless communication interface 173 is in a standby state to receive data from an external device.

The wireless communication interface 173 can be wirelessly connected to an external device (S10).

The wireless communication interface 173 may operate in a standby state or a data communication state when wirelessly connected to an external device. The standby state is an operating state for receiving data from an external device, and may be a state in which there is no data stored in a queue (not shown). The data communication state is an operating state in which data is being received from an external device, and may be a state in which data stored in a queue (not shown) exists.

The controller 170 can set the transmission timing of the token packet when the wireless communication interface 173 is wirelessly connected to an external device (S20).

A default value may be stored in the display device 100 to be set as the transmission timing of the token packet when wirelessly connecting with an external device. For example, the default value may be the first timing, and the first timing may be 1.1us, but since this is only an example, it is reasonable that it is not limited thereto.

For example, when the wireless communication interface 173 is wirelessly connected to an external device, the controller 170 may set the transmission timing of the token packet to the first timing.

The controller 170 may transmit a token packet to the wireless communication interface 173 according to the set transmission timing (S30).

The wireless communication interface 173 may receive a token packet from the controller 170.

When the wireless communication interface 173 receives a token packet from the controller 170, it can obtain the presence or absence of data stored in the queue (S40).

That is, when the wireless communication interface 173 receives a token packet from the controller 170, it can determine whether data received from an external device is stored in the queue.

If data stored in the queue exists, the wireless communication interface 173 may transmit the data stored in the queue to the controller 170 (S42).

If data is stored in the queue, the wireless communication interface 173 can transmit the stored data to the controller 170 through a data packet.

When the controller 170 receives a data packet from the wireless communication interface 173, it can determine that the wireless communication interface 173 is in a data communication state. Additionally, the controller 170 may generate and transmit a token packet based on data received from the wireless communication interface 173 when the wireless communication interface 173 is in a data communication state. In this case, since the generation and transmission of token packets continuously changes depending on the data, the noise emission level caused by the token packets may be low.

If there is no data stored in the queue, the wireless communication interface 173 may transmit a negative response (NAK) to the controller 170 (S44).

The controller 170 may receive a data packet or a negative response from the wireless communication interface 173.

The controller 170 may obtain whether a negative response (NAK) is received (S50).

That is, the controller 170 can determine whether a negative response (NAK) has been received.

If the controller 170 does not receive a negative response (NAK), it can process data received from an external device through the wireless communication interface 173 (S70).

When receiving a negative acknowledgment (NAK), the controller 170 may adjust the transmission timing of the token packet so that it is transmitted aperiodically (S60).

The controller 170 may transmit the token packet to the wireless communication interface 173 based on the transmission timing of the token packet adjusted to be transmitted aperiodically.

Meanwhile, there may be various methods by which the controller 170 adjusts the transmission timing of the token packet so that the token packet is transmitted aperiodically.

Hereinafter, with reference to FIGS. 6 to 8, various methods of controlling the transmission timing of token packets so that the controller transmits the token packets aperiodically in the display device according to an embodiment of the present disclosure will be described in detail.

The wireless communication interface 173 can be wirelessly connected to an external device (S110).

This is the same as step S10 in FIG. 5, so duplicate description will be omitted.

When the wireless communication interface 173 is wirelessly connected to an external device, the controller 170 may set the transmission timing of the token packet to the first timing (S120).

The first timing may be a default value stored to be set as the transmission timing of the token packet when the display device 100 wirelessly connects to an external device. For example, the first timing may be 1.1us, but since this is only an example, it is reasonable that it is not limited thereto.

The controller 170 may transmit a token packet to the wireless communication interface 173 according to the set transmission timing (S130).

According to the first embodiment, the controller 170 may transmit a token packet to the wireless communication interface 173 at each first timing.

When the wireless communication interface 173 receives a token packet from the controller 170, it can obtain the presence or absence of data stored in the queue (S140).

If data stored in the queue exists, the wireless communication interface 173 may transmit the data stored in the queue to the controller 170 (S142).

If there is no data stored in the queue, the wireless communication interface 173 may transmit a negative response (NAK) to the controller 170 (S144).

Since steps S140, S142, and S144 are the same as those described in steps S40, S42, and S44 of FIG. 5, duplicate descriptions will be omitted.

The controller 170 may obtain whether a negative response (NAK) is received (S150).

If the controller 170 does not receive a negative response (NAK), it can process data received from an external device through the wireless communication interface 173 (S170).

Since steps S150 and S170 are the same as those described in steps S50 and S70 of FIG. 5, duplicate descriptions will be omitted.

When receiving a negative response (NAK), the controller 170 may obtain whether the number of times the negative response (NAK) has been received is an even number (S162).

Conversely, when receiving a negative response (NAK), the controller 170 may obtain whether the number of times the negative response (NAK) has been received is an odd number.

That is, when receiving a negative response (NAK), the controller 170 counts the number of times a negative response (NAK) is received and determines whether the counted number of times a negative response (NAK) is received is an even number or an odd number. You can judge.

If the number of times a negative response (NAK) is received is an even number, the controller 170 sets the token packet transmission timing to the second timing (S164), and if the number of negative responses (NAKs) is received is an odd number, the token packet transmission timing is set. can be set as the first timing (S120).

The second timing may be longer than the first timing. For example, the first timing may be 1.1us and the second timing may be 1.75us, but this is only an example for explanation and is not limited thereto.

In this case, the controller 170 transmits the token packet after 1.1us when the number of times it receives a negative response (NAK) is an odd number, and transmits the token packet after 1.75us when the number of times it receives a negative response (NAK) is an odd number. You can.

In addition, the controller 170 sets the transmission timing of the token packet to the second timing when the number of times a negative response (NAK) is received is an odd number, and when the number of times a negative response (NAK) is received is an even number, the controller 170 sets the transmission timing of the token packet to the second timing. It can also be set to the first timing.

That is, according to the first embodiment, the controller 170 may adjust the timing of transmitting the token packet based on the number of times a negative acknowledgment (NAK) is received. If the number of times a negative response is received is an odd number, the controller 170 sets the transmission timing of the token packet to the first timing, and if the number of times a negative response is received is an even number, the controller 170 sets the transmission timing of the token packet to the second timing and sets the token packet transmission timing to the second timing. can be transmitted aperiodically. In summary, the controller 170 can transmit token packets aperiodically by setting the transmission timing of the token packet differently depending on whether the number of times a negative acknowledgment (NAK) is received is even or odd.

The wireless communication interface 173 can be wirelessly connected to an external device (S210), and when the wireless communication interface 173 is wirelessly connected to an external device, the controller 170 sets the transmission timing of the token packet (S220), and the set A token packet can be transmitted to the wireless communication interface 173 according to the transmission timing (S230).

Since steps S210, S220, and S230 are the same as steps S10, S20, and S30 of FIG. 5, duplicate descriptions will be omitted.

When receiving a token packet from the controller 170, the wireless communication interface 173 obtains the presence or absence of data stored in the queue (S240), and if data stored in the queue exists, transmits the data stored in the queue to the controller 170. (S242), if there is no data stored in the queue, a negative response (NAK) is transmitted to the controller 170 (S244), and the controller 170 can obtain whether the negative response (NAK) is received (S250) . If a negative response (NAK) is not received, the controller 170 may process data received from an external device through the wireless communication interface 173 (S270).

Likewise, steps S230, S240, S242, S244, S250, and S270 are the same as steps S30, S40, S42, S44, S50, and S70 of FIG. 5, and duplicate descriptions will be omitted.

Meanwhile, according to the second embodiment, when receiving a negative response (NAK), the controller 170 may increase/decrease the transmission timing of the token packet by a predetermined time (S260).

When receiving a negative acknowledgment (NAK), the controller 170 may increase or decrease the transmission timing of the token packet by a predetermined amount of time. That is, the controller 170 may increase the transmission timing of the token packet by a predetermined time (for example, 0.1us) each time a negative acknowledgment (NAK) is received. Alternatively, the controller 170 may reduce the transmission timing of the token packet by a predetermined time (for example, 0.1us) each time a negative acknowledgment (NAK) is received.

A specific example will be described assuming that the transmission timing of the token packet is increased every time a negative acknowledgment (NAK) is received. When connecting wirelessly with an external device, the controller 170 sets the token packet transmission timing to 1.1us, and when it first receives a negative response (NAK), it sets the token packet transmission timing to 1.2us and sends a negative response ( When receiving a NAK for the second time, the token packet transmission timing can be set to 1.3us, and when a negative acknowledgment (NAK) is received for the third time, the token packet transmission timing can be set to 1.4us. Accordingly, the controller 170 transmits the first token packet at 1.1us based on the time of wireless connection with the external device, transmits the second token packet at 2.3us (1.2us after transmitting the first token packet), and transmits the second token packet at 3.3us. The third token packet can be transmitted at (1.3us after transmitting the second token packet), and the fourth token packet can be transmitted at 4.7us (1.4us after transmitting the third token packet).

As another example, the controller 170 sets the token packet transmission timing to 1.8us when wirelessly connecting with an external device, and when receiving a negative response (NAK) for the first time, sets the token packet transmission timing to 1.7us, If a negative acknowledgment (NAK) is received for the second time, the token packet transmission timing can be set to 1.6us, and if a negative acknowledgment (NAK) is received for the third time, the token packet transmission timing can be set to 1.5us.

In this way, when the wireless communication interface 173 is in a standby state, the controller 170 increases or decreases the transmission timing of the token packet by a predetermined time every time it receives a positive response (NAK) for the token packet to transmit the token packet. It can be transmitted periodically.

The wireless communication interface 173 can be wirelessly connected to an external device (S310), and when the wireless communication interface 173 is wirelessly connected to an external device, the controller 170 sets the transmission timing of the token packet (S320), and the set A token packet can be transmitted to the wireless communication interface 173 according to the transmission timing (S330).

Steps S310, S320, and S330 are the same as steps S10, S20, and S30 of FIG. 5, and duplicate descriptions will be omitted.

Meanwhile, according to the third embodiment, when the controller 170 transmits a token packet, it can increase/decrease the timing of the token packet by a predetermined amount of time (S332).

The controller 170 may increase or decrease the transmission timing of the token packet by a predetermined amount of time each time the token packet is transmitted.

When receiving a token packet from the controller 170, the wireless communication interface 173 obtains the presence or absence of data stored in the queue (S340), and if data stored in the queue exists, transmits the data stored in the queue to the controller 170. (S342), if there is no data stored in the queue, a negative response (NAK) is transmitted to the controller 170 (S344), and the controller 170 can obtain whether the negative response (NAK) is received (S350) . If a negative response (NAK) is not received, the controller 170 may process data received from an external device through the wireless communication interface 173 (S370).

Likewise, steps S340, S342, S344, S350, and S370 are the same as steps S40, S42, S44, S50, and S70 of FIG. 5, and duplicate descriptions will be omitted.

When receiving a negative response (NAK), the controller 170 may transmit a token packet to the wireless communication interface 173 according to the re-set transmission timing (S330).

At this time, since the transmission timing of the token packet increases or decreases after previously transmitting the token packet, the transmission timing when the token packet is previously transmitted may be different from the transmission timing when the current token packet is transmitted.

That is, previously the token packet was transmitted with a transmission timing of 1.1us, but now the token packet can be transmitted with a transmission timing of 1.2us.

In this way, the controller 170 may transmit the token packet aperiodically by increasing or decreasing the transmission timing of the token packet by a predetermined time each time the token packet is transmitted.

In addition, specific methods by which the controller 170 aperiodically transmits token packets may vary.

For example, the controller 170 may set a randomly determined number within a predetermined range as the transmission timing of the token packet and transmit the token packet.

As another example, the controller 170 may transmit a token packet through spread spectrum.

As described above, the controller 170 may aperiodically transmit token packets through various methods when the wireless communication interface 173 is in a standby state. Accordingly, the transmission timing of the token packet may be varied when the wireless communication interface 173 is in a standby state.

The left side of FIG. 9 shows the results of measuring the token packet (Token Signal) and the resulting noise emission level when the transmission timing of the token packet is fixed, that is, when the token packet is transmitted at regular intervals.

On the other hand, on the right side of FIG. 9, when the transmission timing of the token packet is variable, specifically, as described with reference to FIG. 6, the transmission timing is set differently depending on whether the number of negative acknowledgments (NAKs) received is odd or even. This is the result of measuring the token packet (Token Signal) and the resulting noise emission level. In the example of Figure 9, it can be seen that the transmission timing of the token packet is set alternately to 1.1us and 1.75us. That is, it can be seen that the token packet is transmitted aperiodically on the right side of FIG. 9 compared to the left side. And, when comparing each noise level, it can be seen that the measurement is significantly lower on the right compared to the left.

In summary, when token packets are transmitted aperiodically, the noise level radiated by the token packets is low, so it can be confirmed that electromagnetic noise is reduced.

According to an embodiment of the present invention, the above-described method can be implemented as processor-readable code on a program-recorded medium. Examples of media that the processor can read include ROM, RAM, CD-ROM, magnetic tape, floppy disk, and optical data storage devices.

The display device described above is not limited to the configuration and method of the above-described embodiments, and the embodiments may be configured by selectively combining all or part of each embodiment so that various modifications can be made. It may be possible.

Claims

A wireless communication interface for wireless connection with external devices; and

A controller that transmits a token packet requesting data transmitted from the external device to the wireless communication interface,

The controller is

Transmitting the token packet aperiodically when the wireless communication interface is in a standby state to receive the data

Display device.
In claim 1,

The controller is

When receiving a negative response to the token packet, determining the wireless communication interface to be in the standby state

Display device.
In claim 2,

The controller is

Adjusting the timing of transmitting the token packet based on the number of times the negative response is received.

Display device.
In claim 3,

The controller is

If the number of times the negative response has been received is an odd number, the transmission timing of the token packet is set to the first timing, and if the number of times the negative response has been received is an even number, the transmission timing of the token packet is set to the second timing and the token packet transmitting aperiodically

Display device.
In claim 4,

The second timing is longer than the first timing

Display device.
In claim 1,

The controller is

Each time the token packet is transmitted, the token packet is aperiodically transmitted by increasing or decreasing the transmission timing of the token packet by a predetermined time.

Display device.
In claim 1,

The controller is

Whenever a negative response to the token packet is received, the token packet is aperiodically transmitted by increasing or decreasing the transmission timing of the token packet by a predetermined time.

Display device.
In claim 1,

The controller is

transmitting a token packet based on the data when the wireless communication interface is in a data communication state receiving the data

Display device.
A wireless communication interface performing a wireless connection with an external device; and

A controller transmitting a token packet requesting data transmitted from the external device to the wireless communication interface,

The step of transmitting the token packet is

Aperiodically transmitting the token packet when the wireless communication interface is in a standby state to receive the data.

How the display device operates.
In claim 9,

The step of transmitting the token packet is

The controller further includes determining the wireless communication interface to be in the standby state when receiving a negative response to the token packet.

How the display device operates.
In claim 10,

The step of transmitting the token packet is

Further comprising adjusting the timing of transmitting the token packet based on the number of times the negative response is received.

How the display device operates.
In claim 11,

The step of aperiodically transmitting the token packet is

If the number of times the negative response has been received is an even number, the transmission timing of the token packet is set to the first timing, and if the number of times the negative response has been received is an odd number, the transmission timing of the token packet is set to the second timing and the token packet Comprising the step of aperiodically transmitting

How the display device operates.
In claim 9,

The step of aperiodically transmitting the token packet is

When the wireless communication interface is in a standby state, each time the token packet is transmitted, increasing the transmission timing of the token packet by a predetermined time and aperiodically transmitting the token packet.

How the display device operates.
In claim 9,

The step of aperiodically transmitting the token packet is

When the wireless communication interface is in a standby state, each time a negative response to the token packet is received, increasing the transmission timing of the token packet by a predetermined time and aperiodically transmitting the token packet.

How the display device operates.
In claim 9,

The step of transmitting the token packet is

Comprising the step of transmitting a token packet based on the data when in a data communication state receiving the data through the wireless communication interface.

How the display device operates.