Patent Description:
Display devices that output video signals and audio signals, such as TVs and monitors, may be used in connection with various source devices such as set-top boxes, smart phones, PCs, notebook computers, and game consoles.

When a display device and a source device are connected to each other, the source device provides a video signal and an audio signal to the display device, and the video signal and the audio signal are finally output through the display device.

Meanwhile, when the display device and the source device are connected to each other, the video signal and the audio signal are provided from the source device to the display device according to various technical standards. In addition, as technology standards have recently evolved to HDMI <NUM>, HDMI <NUM> and HDMI <NUM>, display devices have to provide information about more functions and resolutions to source devices through EDID.

However, due to various HDMI versions, a user has to directly check an HDMI version supported by a source device and manually set the HDMI version on a display device. However, a user has to manually set an HDMI version supported by a source device in a display device. Document <CIT> relates to an electronic device capable of performing communication with an external device and a controlling method thereof.

The present disclosure provides a display device capable of providing EDID information corresponding to an HDMI version supported by a source device, even when a user does not manually set the HDMI version in the display device, and an EDID information changing method thereof.

Hereinafter, specific embodiments of the present disclosure will be described in detail with reference to the drawings.

Hereinafter, embodiments relating to the present disclosure will be described in detail with reference to the accompanying drawings. The suffixes "module" and "unit" for components used in the description below are assigned or mixed in consideration of easiness in writing the specification and do not have distinctive meanings or roles by themselves.

A display device according to an embodiment of the present disclosure, for example, as an artificial display device that adds a computer supporting function to a broadcast receiving function, can have an easy-to-use interface such as a writing input device, a touch screen, or a spatial remote control device as an Internet function is added while fulfilling the broadcast receiving function. Then, with the support of a wired or wireless Internet function, it is possible to perform an e-mail, web browsing, banking, or game function in access to Internet and computers. In order to perform such various functions, standardized general purpose OS can be used.

Accordingly, since various applications are freely added or deleted on a general purpose OS kernel, a display device described herein, for example, can perform various user-friendly functions. The display device, in more detail, can be a network TV, Hybrid Broadcast Broadband TV (HBBTV), smart TV, light-emitting diode (LED) TV, organic light-emitting diode (OLED) TV, and so on and in some cases, can be applied to a smartphone.

<FIG> is a block diagram illustrating a configuration of a display device according to an embodiment of the present disclosure.

Referring to <FIG>, a display device <NUM> can include a broadcast receiver <NUM>, an external device interface <NUM>, a storage <NUM>, a user interface <NUM>, a controller, a wireless communication interface <NUM>, a display <NUM>, an audio output module <NUM>, and a power supply <NUM>.

The broadcast receiver <NUM> can include a tuner <NUM>, a demodulator <NUM>, and a network interface <NUM>.

The tuner <NUM> can select a specific broadcast channel according to a channel selection command. The tuner <NUM> can receive broadcast signals for the selected specific broadcast channel.

The demodulator <NUM> can divide the received broadcast signals into video signals, audio signals, and broadcast program related data signals and restore the divided video signals, audio signals, and data signals to an output available form.

The external device interface <NUM> can receive an application or an application list in an adjacent external device and deliver it to the controller <NUM> or the storage <NUM>.

The external device interface <NUM> can provide a connection path between the display device <NUM> and an external device. The external device interface <NUM> can receive at least one an image or audio output from an external device that is wirelessly or wiredly connected to the display device <NUM> and deliver it to the controller <NUM>. The external device interface <NUM> can include a plurality of external input terminals. The plurality of external input terminals can include an RGB terminal, at least one High Definition Multimedia Interface (HDMI) terminal, and a component terminal.

An image signal of an external device input through the external device interface <NUM> can be output through the display <NUM>. A voice signal of an external device input through the external device interface <NUM> can be output through the audio output module <NUM>.

An external device connectable to the external device interface <NUM> can be one of a set-top box, a Blu-ray player, a DVD player, a game console, a sound bar, a smartphone, a PC, a USB Memory, and a home theater system, but this is just exemplary.

The network interface <NUM> can provide an interface for connecting the display device <NUM> to a wired/wireless network including the Internet network. The network interface <NUM> can transmit or receive data to or from another user or another electronic device through an accessed network or another network linked to the accessed network.

Additionally, some content data stored in the display device <NUM> can be transmitted to a user or an electronic device, which is selected from other users or other electronic devices pre-registered in the display device <NUM>.

The network interface <NUM> can access a predetermined webpage through an accessed network or another network linked to the accessed network. In other words, the network interface <NUM> can transmit or receive data to or from a corresponding server by accessing a predetermined webpage through the network.

Then, the network interface <NUM> can receive contents or data provided from a content provider or a network operator. In other words, the network interface <NUM> can receive contents such as movies, advertisements, games, VODs, and broadcast signals, which are provided from a content provider or a network provider, through network and information relating thereto.

Additionally, the network interface <NUM> can receive firmware update information and update files provided from a network operator and transmit data to an Internet or content provider or a network operator.

The network interface <NUM> can select and receive a desired application among applications open to the air, through network.

The storage <NUM> can store signal-processed image, voice, or data signals stored by a program in order for each signal processing and control in the controller <NUM>.

Additionally, the storage <NUM> can perform a function for temporarily storing image, voice, or data signals output from the external device interface <NUM> or the network interface <NUM> and can store information on a predetermined image through a channel memory function.

The storage <NUM> can store an application or an application list input from the external device interface <NUM> or the network interface <NUM>.

The display device <NUM> can play content files (for example, video files, still image files, music files, document files, application files, and so on) stored in the storage <NUM> and provide them to a user.

The user interface <NUM> can deliver signals input by a user to the controller <NUM> or deliver signals from the controller <NUM> to a user. For example, the user interface <NUM> can receive or process control signals such as power on/off, channel selection, and screen setting from the remote control device <NUM> or transmit control signals from the controller <NUM> to the remote control device <NUM> according to various communication methods such as Bluetooth, Ultra Wideband (WB), ZigBee, Radio Frequency (RF), and IR.

Additionally, the user interface <NUM> can deliver, to the controller <NUM>, control signals input from local keys (not illustrated) such as a power key, a channel key, a volume key, and a setting key.

Image signals that are image-processed in the controller <NUM> can be input to the display <NUM> and displayed as an image corresponding to corresponding image signals. Additionally, image signals that are image-processed in the controller <NUM> can be input to an external output device through the external device interface <NUM>.

Voice signals processed in the controller <NUM> can be output to the audio output module <NUM>. Additionally, voice signals processed in the controller <NUM> can be input to an external output device through the external device interface <NUM>.

Besides that, the controller <NUM> can control overall operations in the display device <NUM>. Additionally, the controller <NUM> can control the display device <NUM> by a user command or internal program input through the user interface <NUM> and download a desired application or application list into the display device <NUM> in access to network.

The controller <NUM> can output channel information selected by a user together with processed image or voice signals through the display <NUM> or the audio output module <NUM>.

Additionally, according to an external device image playback command received through the user interface <NUM>, the controller <NUM> can output image signals or voice signals of an external device such as a camera or a camcorder, which are input through the external device interface <NUM>, through the display <NUM> or the audio output module <NUM>.

Moreover, the controller <NUM> can control the display <NUM> to display images and control broadcast images input through the tuner <NUM>, external input images input through the external device interface <NUM>, images input through the network interface, or images stored in the storage <NUM> to be displayed on the display <NUM>. In this case, an image displayed on the display <NUM> can be a still image or video and also can be a 2D image or a 3D image.

Additionally, the controller <NUM> can play content stored in the display device <NUM>, received broadcast content, and external input content input from the outside, and the content can be in various formats such as broadcast images, external input images, audio files, still images, accessed web screens, and document files.

The wireless communication interface <NUM> can perform a wired or wireless communication with an external electronic device. The wireless communication interface <NUM> can perform short-range communication with an external device. For this, the wireless communication interface <NUM> can support short-range communication by using at least one of Bluetooth™, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, Near Field Communication (NFC), Wireless-Fidelity (Wi-Fi), Wi-Fi Direct, and Wireless Universal Serial Bus (USB) technologies. The wireless communication interface <NUM> can support wireless communication between the display device <NUM> and a wireless communication system, between the display device <NUM> and another display device <NUM>, or between networks including the display device <NUM> and another display device <NUM> (or an external server) through wireless area networks. The wireless area networks can be wireless personal area networks.

Herein, the other display device <NUM> can be a mobile terminal such as a wearable device (for example, a smart watch, a smart glass, and a head mounted display (HMD)) or a smartphone, which is capable of exchanging data (or inter-working) with the display device <NUM>. The wireless communication interface <NUM> can detect (or recognize) a communicable wearable device around the display device <NUM>. Furthermore, if the detected wearable device is a device authenticated to communicate with the display device <NUM>, the controller <NUM> can transmit at least part of data processed in the display device <NUM> to the wearable device through the wireless communication interface <NUM>. Accordingly, a user of the wearable device can use the data processed in the display device <NUM> through the wearable device.

The display <NUM> can convert image signals, data signals, or on-screen display (OSD) signals, which are processed in the controller <NUM>, or images signals or data signals, which are received in the external device interface <NUM>, into R, G, and B signals to generate driving signals.

Meanwhile, the display device <NUM> illustrated in <FIG> is just one embodiment of the present disclosure and thus, some of the components illustrated can be integrated, added, or omitted according to the specification of the actually implemented display device <NUM>.

In other words, if necessary, two or more components can be integrated into one component or one component can be divided into two or more components and configured.

According to another embodiment of the present disclosure, unlike <FIG>, the display device <NUM> can receive images through the network interface <NUM> or the external device interface <NUM> and play them without including the tuner <NUM> and the demodulator <NUM>.

For example, the display device <NUM> can be 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 contents input from the image processing device.

In this case, an operating method of a display device according to an embodiment of the present disclosure described below can be performed by one of the display device described with reference to <FIG>, an image processing device such as the separated set-top box, and a content playback device including the display <NUM> and the audio output module <NUM>.

Then, referring to <FIG> and <FIG>, a remote control device is described according to an embodiment of the present disclosure.

<FIG> is a block diagram illustrating a remote control device according to an embodiment of the present disclosure and <FIG> is a view illustrating an actual configuration of a remote control device <NUM> according to an embodiment of the present disclosure.

First, referring to <FIG>, a remote control device <NUM> can include a fingerprint recognizer <NUM>, a wireless communication interface <NUM>, a user input module <NUM>, a sensor <NUM>, an output module <NUM>, a power supply <NUM>, a storage <NUM>, a controller <NUM>, and a voice acquirer <NUM>.

Referring to <FIG>, the wireless communication interface <NUM> transmits/receives signals to/from an arbitrary any one of display devices according to the above-mentioned embodiments of the present disclosure.

The remote control device <NUM> can include a radio frequency (RF) module <NUM> for transmitting/receiving signals to/from the display device <NUM> according to the RF communication standards and an IR module <NUM> for transmitting/receiving signals to/from the display device <NUM> according to the IR communication standards. Additionally, the remote control device <NUM> can include a Bluetooth module <NUM> for transmitting/receiving signals to/from the display device <NUM> according to the Bluetooth communication standards. Additionally, the remote control device <NUM> can include a Near Field Communication (NFC) module <NUM> for transmitting/receiving signals to/from the display device <NUM> according to the NFC communication standards and a WLAN module <NUM> for transmitting/receiving signals to/from the display device <NUM> according to the Wireless LAN (WLAN) communication standards.

Additionally, the remote control device <NUM> can transmit signals containing information on a movement of the remote control device <NUM> to the display device <NUM> through the wireless communication interface <NUM>.

Moreover, the remote control device <NUM> can receive signals transmitted from the display device <NUM> through the RF module <NUM> and if necessary, can transmit a command on power on/off, channel change, and volume change to the display device <NUM> through the IR module <NUM>.

The user input module <NUM> can be configured with a keypad button, a touch pad, or a touch screen. A user can manipulate the user input module <NUM> to input a command relating to the display device <NUM> to the remote control device <NUM>. If the user input module <NUM> includes a hard key button, a user can input a command relating to the display device <NUM> to the remote control device <NUM> through the push operation of the hard key button. This will be described with reference to <FIG>.

Referring to <FIG>, the remote control device <NUM> can include a plurality of buttons. The plurality of buttons can include a fingerprint recognition button <NUM>, a power button <NUM>, a home button <NUM>, a live button <NUM>, an external input button <NUM>, a voice adjustment button <NUM>, a voice recognition button <NUM>, a channel change button <NUM>, a check button <NUM>, and a back button <NUM>.

The fingerprint recognition button <NUM> can be a button for recognizing a user's fingerprint. According to an embodiment of the present disclosure, the fingerprint recognition button <NUM> can perform a push operation and receive a push operation and a fingerprint recognition operation. The power button <NUM> can be button for turning on/off the power of the display device <NUM>. The home button <NUM> can be a button for moving to the home screen of the display device <NUM>. The live button <NUM> can be a button for displaying live broadcast programs. The external input button <NUM> can be a button for receiving an external input connected to the display device <NUM>. The voice adjustment button <NUM> can be a button for adjusting the size of a volume output from the display device <NUM>. The voice recognition button <NUM> can be a button for receiving user's voice and recognizing the received voice. The channel change button <NUM> can be a button for receiving broadcast signals of a specific broadcast channel. The check button <NUM> can be a button for selecting a specific function and the back button <NUM> can be a button for returning to a previous screen.

If the user input module <NUM> includes a touch screen, a user can touch a soft key of the touch screen to input a command relating to the display device <NUM> to the remote control device <NUM>. Additionally, the user input module <NUM> can include various kinds of input means manipulated by a user, for example, a scroll key and a jog key.

The sensor <NUM> can include a gyro sensor <NUM> or an acceleration sensor <NUM> and the gyro sensor <NUM> can sense information on a movement of the remote control device <NUM>.

For example, the gyro sensor <NUM> can sense information on an operation of the remote control device <NUM> on the basis of x, y, and z axes and the acceleration sensor <NUM> can sense information on a movement speed of the remote control device <NUM>. Moreover, the remote control device <NUM> can further include a distance measurement sensor and sense a distance with respect to the display <NUM> of the display device <NUM>.

The output module <NUM> can output image or voice signals corresponding to manipulation of the user input module <NUM> or corresponding to signals transmitted from the display device <NUM>. A user can recognize whether the user input module <NUM> is manipulated or the display device <NUM> is controlled through the output module <NUM>.

For example, the output module <NUM> can include an LED module <NUM> for flashing, a vibration module <NUM> for generating vibration, a sound output module <NUM> for outputting sound, or a display module <NUM> for outputting an image, if the user input module <NUM> is manipulated or signals are transmitted/received to/from the display device <NUM> through the wireless communication interface <NUM>.

Additionally, the power supply <NUM> supplies power to the remote control device <NUM> and if the remote control device <NUM> does not move for a predetermined time, stops the power supply, so that power waste can be reduced. The power supply <NUM> can resume the power supply if a predetermined key provided at the remote control device <NUM> is manipulated.

The storage <NUM> can store various kinds of programs and application data necessary for control or operation of the remote control device <NUM>. If the remote control device <NUM> transmits/receives signals wirelessly through the display device <NUM> and the RF module <NUM>, the remote control device <NUM> and the display device <NUM> transmits/receives signals through a predetermined frequency band.

The controller <NUM> of the remote control device <NUM> can store, in the storage <NUM>, information on a frequency band for transmitting/receiving signals to/from the display device <NUM> paired with the remote control device <NUM> and refer to it.

The controller <NUM> controls general matters relating to control of the remote control device <NUM>. The controller <NUM> can transmit a signal corresponding to a predetermined key manipulation of the user input module <NUM> or a signal corresponding to movement of the remote control device <NUM> sensed by the sensor <NUM> to the display device <NUM> through the wireless communication interface <NUM>.

Additionally, the voice acquirer <NUM> of the remote control device <NUM> can obtain voice.

The voice acquirer <NUM> can include at least one microphone <NUM> and obtain voice through the microphone <NUM>.

<FIG> is a view of utilizing a remote control device according to an embodiment of the present disclosure.

<FIG> illustrates that a pointer <NUM> corresponding to the remote control device <NUM> is displayed on the display <NUM>.

A user can move or rotate the remote control device <NUM> vertically or horizontally. The pointer <NUM> displayed on the display <NUM> of the display device <NUM> corresponds to a movement of the remote control device <NUM>. Since the corresponding pointer <NUM> is moved and displayed according to a movement on a 3D space as show in the drawing, the remote control device <NUM> can be referred to as a spatial remote control device.

<FIG> illustrates that if a user moves the remote control device <NUM>, the pointer <NUM> displayed on the display <NUM> of the display device <NUM> is moved to the left according to the movement of the remote control device <NUM>.

Information on a movement of the remote control device <NUM> detected through a sensor of the remote control device <NUM> is transmitted to the display device <NUM>. The display device <NUM> can calculate the coordinates of the pointer <NUM> from the information on the movement of the remote control device <NUM>. The display device <NUM> can display the pointer <NUM> to match the calculated coordinates.

<FIG> illustrates that while a specific button in the remote control device <NUM> is pressed, a user moves the remote control device <NUM> away from the display <NUM>. Thus, a selection area in the display <NUM> corresponding to the pointer <NUM> can be zoomed in and displayed larger.

On the contrary, if the user moves the remote control device <NUM> to approach the display <NUM>, the selection area in the display <NUM> corresponding to the pointer <NUM> may be zoomed out and reduced.

On the other hand, if the remote control device <NUM> is moved away from the display <NUM>, a selection area can be zoomed out and if the remote control device <NUM> is moved closer to the display <NUM>, a selection area can be zoomed in.

Additionally, if a specific button in the remote control device <NUM> is pressed, recognition of a vertical or horizontal movement can be excluded. In other words, if the remote control device <NUM> is moved away from or closer to the display <NUM>, the up, down, left, or right movement cannot be recognized and only the back and forth movement can be recognized. While a specific button in the remote control device <NUM> is not pressed, only the pointer <NUM> is moved according to the up, down, left or right movement of the remote control device <NUM>.

Moreover, the moving speed or moving direction of the pointer <NUM> can correspond to the moving speed or moving direction of the remote control device <NUM>.

Furthermore, a pointer in this specification means an object displayed on the display <NUM> in response to an operation of the remote control device <NUM>. Accordingly, besides an arrow form displayed as the pointer <NUM> in the drawing, various forms of objects are possible. For example, the above concept includes a point, a cursor, a prompt, and a thick outline. Then, the pointer <NUM> can be displayed in correspondence to one point of a horizontal axis and a vertical axis on the display <NUM> and also can be displayed in correspondence to a plurality of points such as a line and a surface.

Meanwhile, the controller <NUM> may also be referred to as a processor <NUM>. In addition, the external device interface <NUM> may also be referred to as an external input interface <NUM>. The storage <NUM> may also be referred to as a memory <NUM>.

<FIG> is an exemplary view in which a source device is connected to a display device, according to an embodiment of the present disclosure.

Referring to <FIG>, a source device <NUM> may be connected to a display device <NUM> through an external input interface <NUM>.

In addition, when the source device <NUM> is connected to the display device <NUM> through the external input interface <NUM>, a predetermined connection process may be performed.

For example, the source device <NUM> and the display device <NUM> may perform a connection process as follows. The source device <NUM> and the display device <NUM> may be connected to each other to transmit or receive signals and data through an HDMI input port included in the external input interface <NUM>.

When the source device <NUM> and the display device <NUM> are connected to each other, the external input interface <NUM> may receive a +5V signal from the source device <NUM>.

The processor <NUM> may detect that a +5V signal is received from the source device <NUM> through the external input interface <NUM>. In this case, the processor <NUM> determines that the source device <NUM> is connected to the display device <NUM> through an HDMI cable.

When the source device <NUM> is connected to the display device <NUM>, the processor <NUM> may transmit a hot plug detection (HPD) high signal to the source device <NUM> through the external input interface <NUM>.

Meanwhile, when the source device <NUM> receives the HPD high signal from the display device <NUM>, it may determine that the display device <NUM> has detected a connection. The HPD high signal may be a signal indicating a time when the source device <NUM> reads extended display identification data (EDID) information from the display device <NUM>.

In addition, the processor <NUM> may transmit EDID information to the source device <NUM> through the external input interface <NUM>. The source device <NUM> may read EDID information from the display device while the HPD high signal is being input.

The EDID information may be a standardized data structure for transmitting resource information supported by the display device <NUM> to a source device. The EDID information may include information about a manufacturer's name, product manufacturing year/month, product type, EDID version, product resolution and color coordinates, phosphor or filter type, timing, screen size, luminance, and pixels. In particular, the EDID information may have different standards according to the corresponding HDMI version.

The source device <NUM> may transmit a video signal or an audio signal related to the corresponding content to the display device <NUM> based on the EDID information received from the display device <NUM>. In addition, when the video signal or the audio signal is received from the source device <NUM>, the display device <NUM> may output the received video signal or audio signal through the display <NUM> or the audio output module <NUM>.

However, when the HDMI version supported by the source device <NUM> and the HDMI version of the EDID information provided to the source device <NUM> are different from each other, the source device <NUM> cannot transmit the video signal or the audio signal to the display device <NUM>.

For example, when the source device <NUM> supports the HDMI version <NUM> and the HDMI version of the EDID information provided from the display device <NUM> to the source device <NUM> is <NUM> or <NUM>, the source device <NUM> cannot identify the HF-VSDB information of the EDID information provided to the source device <NUM>. Therefore, the display device <NUM> cannot receive a normal video signal or audio signal from the source device <NUM>. Therefore, the display device <NUM> needs to change the EDID information to be provided to the source device <NUM> to the HDMI version <NUM> of EDID information.

In addition, for example, when the source device <NUM> is a device that supports the HDMI version <NUM> and outputs a <NUM> 60p image and the HDMI version of the EDID information provided from the display device <NUM> to the source device <NUM> is <NUM>, the source device <NUM> does not provide the support resolution on the VDB of the EDID information. Therefore, the display device <NUM> cannot receive a normal video signal or audio signal from the source device <NUM>.

In addition, for example, when the source device <NUM> supports the HDMI version <NUM> and the HDMI version of the EDID information provided from the display device <NUM> to the source device <NUM> is <NUM> or <NUM>, Fixed Rate Link (FRL), Variable Refresh Rate (VRR), and Display Stream Compression ) DSC) on HF-VSDB of the EDID information are not supported. Therefore, the display device <NUM> cannot receive a normal video signal or audio signal from the source device <NUM>.

In this case, the display device <NUM> needs to provide EDID information of a version that matches the HDMI version supported by the source device <NUM>.

Meanwhile, the display device <NUM> may include a memory <NUM> that stores first EDID information to be provided to the source device and stores a plurality of second EDID information supportable by the display device <NUM>.

In addition, the memory <NUM> may include a first memory that stores first EDID information to be provided to the source device <NUM> and a second memory that stores a plurality of second EDID information supportable by the display device <NUM>.

The first memory can store the first EDID information provided to the source device <NUM> only when the EDID information is provided to the source device <NUM> regardless of power on/off of the display device <NUM>. The first memory may be referred to as an EDID SRAM.

Meanwhile, the second memory stores a plurality of EDID information of different versions from the EDID information stored in the first memory, including the EDID information stored in the first memory. For example, when the display device <NUM> and the source device <NUM> are devices that support HDMI, EDID information changes according to the HDMI version. Therefore, EDID information of different versions, such as version <NUM>, version <NUM>, and version <NUM>, may be stored in the second memory. Therefore, the plurality of EDID information supportable by the display apparatus <NUM> is stored in the second memory. The second memory may be referred to as an EDID block map.

<FIG> is a flowchart for describing an EDID information changing method according to an embodiment of the present disclosure.

The display device <NUM> may be connected to the source device <NUM> through the external input interface <NUM> (S601).

The source device <NUM> and the display device <NUM> may be connected to each other to transmit or receive signals and data through an HDMI input port included in the external input interface <NUM>.

Meanwhile, when the source device <NUM> and the display device <NUM> are connected to each other, the external input interface <NUM> may receive a +5V signal from the source device <NUM> (S602).

Furthermore, the processor <NUM> may transmit a hot plug detection (HPD) high signal to the source device <NUM> through the external input interface <NUM> (S603).

When the source device <NUM> receives the HPD high signal from the display device <NUM>, it may be determined that the display device <NUM> has detected a connection.

In addition, the processor <NUM> may transmit the first EDID information to be provided to the source device <NUM> through the external input interface <NUM> (S604). The source device <NUM> may read EDID information from the display device while the HPD high signal is being input.

The source device <NUM> may transmit a video signal or an audio signal to the display device <NUM> based on the EDID information received from the display device <NUM>.

Meanwhile, the processor <NUM> may determine the presence or absence of a video signal or an audio signal input from the source device <NUM> (S605).

<FIG> is a view illustrating a situation in which a video signal or an audio signal exists, according to an embodiment of the present disclosure.

The external input interface <NUM> may receive an HDMI +5V signal from the source device <NUM>.

The processor <NUM> may detect that a +5V signal is received from the source device <NUM> through the external input interface <NUM>, and may transmit the HPD high signal to the source device <NUM> through the external input interface <NUM>.

In addition, the processor <NUM> may transmit the first EDID information to be provided to the source device <NUM> to the source device <NUM> using a Display Data Channel (DDC) protocol through the external input interface <NUM>. In addition, the source device <NUM> may read the EDID from the display device while the HPD signal is being input.

The processor <NUM> may transmit an HDCP authentication key to the source device <NUM> using a DDC protocol through the external input interface <NUM>. The source device <NUM> may determine whether the HDCP of the display device <NUM> is authenticated. In this case, the source device <NUM> may read the HDCP authentication key of the display device <NUM> and, when the authentication key is matched, may transmit a video signal or an audio signal to the display device <NUM>.

Meanwhile, when the HDMI version supported by the source device <NUM> matches the HDMI version of the EDID information transmitted from the display device <NUM> to the source device <NUM>, the display device <NUM> may receive a normal video signal or an audio signal.

For example, the processor <NUM> may receive a video signal or an audio signal <NUM> based on Transition Minimized Differential Signaling (TMDS) through the external input interface <NUM>.

Therefore, when the TMDS-based video signal or sound signal is received, the processor <NUM> may determine that the video signal or an audio signal input from the source device <NUM> exists.

When the video signal or the audio signal is received from the source device <NUM>, the processor <NUM> may output the received video signal or audio signal through the display <NUM> or the audio output module <NUM> (S606).

<FIG> is a view illustrating a situation in which a video signal or an audio signal is not input, according to an embodiment of the present disclosure.

When the HDMI version supported by the source device <NUM> does not match the HDMI version of the EDID information transmitted from the display device <NUM> to the source device <NUM>, the display device <NUM> cannot receive a normal video signal or an audio signal. A situation occurs in which the processor <NUM> cannot receive a TMDS-based video signal or audio signal through the external input interface <NUM>.

For example, when the HDMI version supported by the display device <NUM> is <NUM> or <NUM>, a TMDS-based input signal has to include a clock (CLK) signal. The display device <NUM> may process the TMDS-based input signal by performing clock data recovery (CDR) through a phase-locked loop (PLL) based on a clock (CLK) signal. However, when the HDMI version supported by the source device <NUM> is <NUM>, the CLK signal is not included in the TMDS-based input signal. Thus, the display device <NUM> cannot process the TMDS-based input signal. Therefore, when the HDMI version supported by the display device <NUM> is <NUM> or <NUM> and the HDMI version supported by the source device <NUM> is <NUM>, the display device <NUM> cannot receive a normal video signal or audio signal.

In addition, for example, when the HDMI version supported by the display device <NUM> is <NUM>, an FRL signal is a signal in which a CLK signal is embedded. Thus, the display device <NUM> can receive a video signal and an audio signal input from the source device <NUM> only when undergoing an FRL Link Training (FLT) process through SCDC handshaking (Status and Control Data Channel Handshaking) using a DDC protocol. However, when the HDMI version supported by the source device <NUM> is not <NUM>, the source device <NUM> cannot perform the FLT process, and thus the display device <NUM> cannot receive a normal video signal or an audio signal.

Therefore, the processor <NUM> may determine that a video signal or an audio signal input from the source device <NUM> does not exist.

Meanwhile, the processor <NUM> may transmit the HPD low signal to the source device <NUM> through the external input interface <NUM> (S607).

When a video signal or an audio signal input from the source device <NUM> is not detected for a preset time, the processor <NUM> may transmit the HPD low signal to the source device <NUM> through the external input interface <NUM>. Therefore, the HPD low signal may be a signal for disconnecting the display device <NUM> from the source device <NUM>.

Meanwhile, the display device <NUM> may attempt to match the HDMI version supported by the source device <NUM> by disconnecting the display device <NUM> from the source device <NUM> through the HPD low signal, changing the HDMI version of the EDID information, and transmitting the changed HDMI version of the EDID information back to the source device <NUM>.

The processor <NUM> may determine whether there is second EDID information having a version different from that of the first EDID information (S608).

For example, when each of the plurality of second EDID information has already been provided to the source device <NUM>, the processor <NUM> may determine that there is no EDID information to be changed.

In this case, the processor <NUM> may determine that an error occurs due to a problem other than the EDID information problem (S610).

Meanwhile, when there is the second EDID information having a version different from that of the first EDID information, the processor <NUM> may change the first EDID information to the second EDID information having a version different from that of the second EDID information (S609).

The processor <NUM> may change the second EDID information, which has not been provided to the source device <NUM> among the plurality of second EDID information, to first EDID information to be provided to the source device <NUM>.

For example, the processor <NUM> may change the first EDID information by writing, to the first memory, the second EDID information that has not been provided to the source device <NUM> among the plurality of second EDID information stored in the second memory.

In addition, for example, when the plurality of second EDID information are version <NUM>, version <NUM>, and version <NUM> of EDID information and the first EDID information is version <NUM> of EDID information, the processor <NUM> may change the version <NUM> or the version <NUM> of the EDID information, which is different from the version <NUM> of the EDID information, to the first EDID information.

Meanwhile, the processor <NUM> may change the first EDID information to be provided to the source device <NUM> to the second EDID information of a version different from the first EDID information, and then transmit an HPD high signal to the source device through the external input interface <NUM>.

Therefore, it may be determined that the source device <NUM> receives the HPD high signal from the display device <NUM>, and the display device <NUM> has detected a connection. Therefore, the source device <NUM> may read changed EDID information from the display device <NUM>.

Therefore, the source device <NUM> may output a video signal or an audio signal based on the changed EDID information, and when the EDID is changed and the HDMI version is matched, the display device <NUM> may receive a normal video signal or audio signal.

Since the change of EDID information may be repeated until second EDID information that has not been provided to the source device <NUM> among the plurality of second EDID information exists, the display device <NUM> may automatically resolve a vidoe or audio output error due to the version mismatch of EDID information.

Claim 1:
A display device comprising:
an external input interface (<NUM>) connected to a source device (<NUM>);
a memory (<NUM>) configured to store a plurality of second extended display identification data, EDID, information supportable by the display device; and
a processor (<NUM>) configured to:
transmit a first EDID to the source device (<NUM>) through the external input interface (<NUM>) when the source device (<NUM>) is connected to the external input interface (<NUM>);
determine the presence or absence of a video signal or an audio signal input from the source device (<NUM>) received in the first EDID; and
change the first EDID and transmit the changed first EDID to the source device (<NUM>) through the external input interface (<NUM>) based on a determination that there is no video signal or audio signal from the source device (<NUM>),
characterized in that:
the changed first EDID is a second EDID having a version different from that of the first EDID and that has not yet been provided to the source device (<NUM>), and
the change of first EDID is repeated until the second EDID that has not been provided to the source device (<NUM>) among the plurality of second EDID information exists in the memory (<NUM>), and when there is no remaining EDID of the plurality of second EDID information that has not yet been provided to the source device, determine that an error has occurred.