KR20170029822A - Broadcasting signal receiver, display apparatus and method of controlling thereof - Google Patents

Abstract

A broadcast signal receiver, a display device, and a control method thereof are disclosed. A broadcast signal receiver according to one aspect includes: an antenna for receiving a broadcast signal including broadcast data related to a broadcast program; And a broadcast signal controller for performing tuning based on the signal states of the plurality of channels when it is determined that broadcast data relating to a plurality of channels is included in the received broadcast signal.

Description

TECHNICAL FIELD [0001] The present invention relates to a broadcast signal receiver, a display device, and a control method thereof.

A broadcast signal receiver for receiving a broadcast signal, a display device, and a control method thereof.

The display device is provided with a broadcast signal receiver so that the user can watch the broadcast. At this time, the broadcast signal receiver performs a broadcast channel search sequentially for all the channels when initial channel setting or automatic channel setting is performed.

In recent years, digital broadcasting is being implemented. Broadcast data relating to a plurality of channels are compressed and simultaneously transmitted to a digital broadcasting signal. Particularly, in recent years, broadcasting data has to be received more accurately due to an increase in broadcasting channels and expansion of UHD (Ultra-HD) class display devices, so that a user can receive a broadcasting service smoothly. Accordingly, research on a method for more accurately receiving a broadcast signal including broadcast data relating to a plurality of channels is underway.

A broadcast signal receiver according to one aspect includes: an antenna for receiving a broadcast signal including broadcast data related to a broadcast program; And a broadcast signal controller for performing tuning based on the signal states of the plurality of channels when it is determined that broadcast data relating to a plurality of channels is included in the received broadcast signal.

In addition, if it is determined that broadcast data relating to a plurality of channels is included in the received broadcast signal, the broadcast signal controller may select a channel to be tuned in the plurality of channels based on the signal states of the plurality of channels .

In addition, when the tuning with the selected channel is completed, the broadcast signal controller can check the arrangement and number of frames to which broadcast data is mapped in the broadcast signal.

In addition, the broadcast signal controller may determine the signal state of each channel based on at least one of a signal quality, a received signal strength, and a signal-to-noise ratio.

Also, the broadcast signal controller may perform tuning for each channel based on the check result.

In addition, the broadcast signal controller may demodulate broadcast data for a plurality of channels included in the broadcast signal to output a stream signal.

A display device according to one aspect includes: an antenna for receiving a broadcast signal including broadcast data related to a broadcast program; A main controller for determining a channel to be tuned based on the signal states of the plurality of channels when it is determined that broadcast data relating to a plurality of channels is included in the received broadcast signal; And a display panel for displaying a broadcast image image-processed based on the stream signal output through the tuning.

If it is determined that broadcast data relating to a plurality of channels is included in the received broadcast signal, the main control unit may select a channel from which the tuning command is to be issued among the plurality of channels based on the signal states of the plurality of channels .

In addition, when the tuning is completed according to the tuning command, the main controller may check the arrangement and number of frames to which broadcast data is mapped in the broadcast signal.

In addition, the broadcast signal controller may determine the signal state of each channel based on at least one of a signal quality, a received signal strength, and a signal-to-noise ratio.

In addition, the main control unit may perform tuning with a plurality of channels included in the broadcast signal based on the check result.

The main control unit may output the stream signal by demodulating a plurality of channel-specific broadcast data included in the broadcast signal.

According to another aspect of the present invention, there is provided a method of controlling a display device, the method comprising: scanning a broadcast signal by frequency band; Determining whether the broadcast signal retrieved through the scan includes broadcast data related to a plurality of channels; And performing tuning based on the signal states of the plurality of channels if it is determined that broadcast data of the plurality of channels is included in the received broadcast signal.

The tuning may further comprise:

And selecting a channel on which the tuning command is to be issued based on the signal states of the plurality of channels if it is determined that broadcast data relating to a plurality of channels is included in the received broadcast signal.

The step of performing the tuning may further include confirming the arrangement and the number of frames to which broadcast data is mapped in the broadcast signal, when the selected channel and the tuning are completed according to the tuning command.

In addition, the step of performing the tuning may determine the signal state of each channel based on at least one of signal quality, received signal strength, and signal-to-noise ratio.

The performing of the tuning may further include performing tuning with a plurality of channels included in the broadcasting signal based on the result of the checking.

The performing of the tuning may further include demodulating the broadcast data for each of a plurality of channels included in the broadcast signal to output the stream signal.

The step of performing the tuning may further include the step of displaying an image-processed broadcast image based on the stream signal output through the tuning.

1 is a view showing the appearance of a display device according to an embodiment.
2 is a diagram showing a control block diagram of a display device that performs tuning based on a signal state according to an embodiment.
FIG. 3 is a diagram illustrating broadcast signals of various channels by frequency according to an exemplary embodiment. Referring to FIG.
4 is a diagram illustrating a broadcast signal including broadcast data of one channel and a broadcast signal of compressed broadcast data of a plurality of channels according to an exemplary embodiment.
5 is a view for explaining a broadcast signal including broadcast data of a plurality of channels according to an embodiment.
6 is a diagram for explaining searching for a broadcast signal through an auto scan according to an embodiment.
7 is a view for explaining an operation in a case where the signal state of the first channel information included in the searched broadcast signal according to the embodiment is not good.
FIG. 8 is a diagram for explaining an operation of determining a signal state for each channel according to an embodiment and performing tuning.
FIG. 9 is a flowchart illustrating an operation of a display apparatus for searching for a DVB-T2 signal according to an embodiment, generating a PLP list, and generating a channel list based on the generated PLP list.
10 is a flowchart illustrating an operation of a display apparatus for preventing a channel from being searched according to a signal state according to an exemplary embodiment.

FIG. 1 is a diagram illustrating an outer appearance of a display device according to an embodiment. FIG. 2 is a control block diagram of a display device that performs tuning based on a signal state according to an exemplary embodiment. 3 to 5 are views for explaining a broadcast signal including broadcast data of one or more channels according to different embodiments.

6 is a diagram for explaining a search for a broadcast signal through an auto scan according to an embodiment of the present invention. FIG. 7 is a flowchart illustrating a method of searching for a broadcast signal according to an exemplary embodiment of the present invention, FIG. 8 is a view for explaining an operation of judging a signal state for each channel according to an embodiment and performing tuning. Hereinafter, the descriptions will be described together to prevent duplication of description.

The display device 1 shown in FIG. 1 has a display panel for displaying an image and is capable of displaying image data in various formats. The display device 1 may include a main body 10 for receiving various components in appearance and a display panel 20 for displaying an image to a user.

2, the display device 1 includes an input unit 120 for receiving a control command from a user, a content receiving unit 130 for receiving content including video and sound from an external device, A broadcast signal receiver 160 for receiving a broadcast signal including a broadcast signal or an image, a video processor 200 for processing video data included in a broadcast signal or content, a display unit 140 for displaying an image corresponding to the video data, A sound output unit 150 for outputting sounds corresponding to the sound data included in the sound data, and a control unit 110 for controlling the overall operation of the display device 1. [

Here, the input unit 120 may include a button group 121 for receiving various control commands from a user. For example, the button group 121 may include a volume button for adjusting the size of sound output from the sound output unit 150, a channel for changing the communication channel received by the content receiving unit 130 or the broadcast signal receiver 160, A power button for turning on / off the power of the display device 1, and the like. In addition, the input unit 120 can receive various control commands related to the operation of the display device 1 from the user through the button group 121, and there is no limitation.

The various buttons included in the button group 121 include a push switch for sensing the user's pressurization and a touch switch for sensing contact with a membrane switch or a user's body part can do. However, the present invention is not limited thereto, and the button group 121 may employ various input means capable of outputting an electrical signal corresponding to a specific operation of the user.

The input unit 120 may include a remote controller for remotely receiving a control command from the user and transmitting the received user control command to the display device 1, .

For example, the input unit 120 may receive a channel search command from the user through the button group 121 or the remote controller. Accordingly, the input unit 120 can transmit a channel search command to the main control unit 110 through the control signal, and the main control unit 110 can perform the channel search by performing the auto scan by controlling the broadcast signal receiver have. A detailed description thereof will be given later.

Meanwhile, as shown in FIG. 2, the display apparatus 1 may include a content receiving unit 130. For example, the content receiving unit 130 may receive content from a multimedia player (e.g., a DVD player, a CD player, a Blu-ray player, or the like) that reproduces content stored in a multimedia storage medium. The content receiving unit 130 may include a plurality of connectors 131 connected to an external device and a receive path selecting unit 132 selecting a path for receiving content among the plurality of connectors 131. [

Meanwhile, as shown in FIG. 2, the display device 1 may be provided with a broadcast signal receiver 160. The broadcast signal receiver 160 extracts a broadcast signal for a specific frequency (channel) among various signals received through the antenna 161, and can appropriately convert the extracted broadcast signal

The broadcast signal receiver 160 wirelessly receives the broadcast signal through the antenna 161 and appropriately converts the received broadcast signal to display the broadcast image through the display unit 140 and outputs the broadcast image to the sound output unit 150. [ So that broadcast sound can be output through the speaker. The broadcast signal receiver 160, which is also called a tuner, is hereinafter referred to as a broadcast signal receiver for convenience of explanation.

The broadcast signal receiver 160 may include an antenna 161, an RF unit 163, and a broadcast signal controller 167, as shown in FIG. Here, the RF unit 163 and the broadcast signal controller 167 may be implemented as a single chip. For example, the RF section 163 may be implemented through an RF module integrated circuit. In addition, the broadcast signal controller 167 may be implemented through a demodulation module integrated circuit.

In addition, the RF unit 163 and the broadcast signal control unit 167 may be implemented as a single chip. For example, the RF unit 163 and the broadcast signal control unit 167 can be integrated into a system on chip (SOC) built in the broadcast signal receiver 160. For example,

Here, the antenna 161 receives signals in various frequency bands as described above. The antenna 161 may be provided inside the display device 1 or may be provided outside, for example.

Meanwhile, the operation of the antenna 161 to receive signals of various frequency bands can be controlled by the broadcast signal controller 167 or the main controller 110. The specific operation of the broadcast signal control unit 167 and the main control unit 110 will be described later.

Here, the broadcast signal is a signal including broadcast data related to a broadcast program. Hereinafter, broadcast data related to a broadcast program will be referred to as broadcast information for convenience of explanation. On the other hand, since the broadcasting information is different for each channel, the user can change the channel and view desired broadcasting information.

Here, the broadcast signal may be modulated, compressed and transmitted by various broadcasting systems, and may include only one channel information or may include a plurality of channel information. In one embodiment, the broadcast signal may be a signal of a single carrier according to an Advanced Television System Committee (ATSC) scheme or a signal of a plurality of carriers according to a DVB (Digital Video Broadcasting) scheme.

Here, the DVB scheme includes various known schemes such as Digital Video Broadcasting-Terrestrial version (DVB-T) and Digital Video Broadcasting-Terrestrial Version T2 (DVB-T2) However, the broadcast signal is not limited to the above-described embodiment, and includes all the signals including contents related to the broadcast program according to various broadcasting schemes.

Meanwhile, one example of a broadcast signal will be described as an example of a broadcast signal according to the DVB-T2 scheme. However, the present invention is not limited to the following embodiments. have.

The DVB-T2 system uses a frequency band of about 700 MHz. In addition, broadcast signals of a plurality of channels may be compressed and included in a broadcast signal by the DVB-T2 scheme. The DVB-T2 system supports transmission modes of 1k, 2k, 4k, 7k, 16k, and 32k. The modulation scheme may be an MPEG scheme, an MPEG-2 scheme, an MPEG-4 scheme scheme, and the modulation schemes may be orthogonal frequency division multiplexing (OFDM) or quadrature phase shift keying (QPSK) In addition, various schemes may be used depending on the digital broadcasting format.

At this time, broadcast information for each channel is mapped to a PLP (Physical Layer Pipe) and included in a broadcast signal. Here, PLP means a logical channel used in a physical layer for collecting and transmitting broadcast information and broadcast data having the same physical transmission characteristics.

On the other hand, the broadcast signal may include a plurality of PLPs. In this case, the PLPs may have different bit rates and may have different error protection parameters, but are not limited thereto.

The broadcast data may be mapped to the PLP and transmitted through the broadcast signal. Accordingly, unlike the conventional case in which broadcast signals are transmitted separately for each channel, the DVB scheme can compress and transmit broadcast information related to a plurality of channels in one broadcast signal.

For example, broadcast information for each channel may be mapped to a PLP corresponding to each channel. On the other hand, the number of PLPs is not limited to a specific number.

For example, according to the 256QAM scheme, the broadcast signal may include 255 PLPs. At this time, each PLP can be given identification information for each channel. For example, an ID may be set for each PLP. For example, in the case of the 256QAM scheme, IDs from 0 to 255 can be assigned to the PLP, respectively. Hereinafter, for convenience of description, a signal whose PLP ID is N times is referred to as N PLPs.

For example, a broadcast signal by a single carrier includes broadcast information about a single channel. As shown in FIG. 3, broadcast signals by a single carrier include information about channel 1 (channel 1) and channel 2 (channel 2), respectively. However, a broadcast signal of a plurality of carriers may include information (chn, n? 4) about channels # 3 to #n as shown in FIG.

In addition, if the physical characteristics of the broadcast signals are the same, the broadcast signals of the multiple carriers may include information about channel 1 (ch1) and channel 2 (ch2) as shown in Fig. Here, broadcast information for each channel is mapped and stored in PLP, respectively. Hereinafter, a signal of each channel will be referred to as a PLP signal.

In FIG. 5, the signal of channel 1 corresponds to the signal of PLP 0, and the signal of channel 2 corresponds to the signal of PLP 1. Accordingly, the broadcast data of channel 1 can be mapped to PLP 0, and the broadcast data of channel 2 can be mapped to PLP 2. However, the mapping method is not limited to the above-described embodiment, and broadcast data for each channel may be divided into a plurality of PLPs and mapped.

On the other hand, the number of PLPs may be a single number or a plurality. For example, as described above, according to the 256QAM scheme, 255 PLPs may be included in the broadcast signal. At this time, the PLP and the tuning may be set to be performed first. Accordingly, when the PLP No. 0 and the tuning are completed, various information related to the intra-frame arrangement of the PLPs from the broadcast signal can be confirmed, so that no problem occurs.

However, if the signal state of the PLP No. 0 is not good at a moment, it is determined that there is no signal, and a problem arises that the other PLP can not be tuned and skipped, i.e., excluded. In this case, the DVB-T2 frequency band itself may be excluded from the channel search. For example, as shown in FIG. 7, when the signal state of the PLP # 0, that is, the channel # 1 is not normal, it is determined that the channel does not exist and the DVB- .

If tuning of PLP No. 0 is performed on a broadcast signal that does not include broadcast data in PLP No. 0, it is determined that there is no signal, so that the DVB-T2 frequency band itself can be excluded from the channel search. In the case described above, a problem arises that the user can not view the broadcast of the desired channel.

As another example, if the PLP is tuned to the PLP # 0 even though the broadcast signal is mapped to PLPs other than the PLP # 0, it is determined that the signal does not exist and the DVB-T2 frequency band itself is excluded from the channel search I can do it.

Accordingly, the broadcast signal controller 165 according to the embodiment performs tuning on the PLP in the signal state in which the signal state is robust among the signals of the PLPs, thereby preventing the broadcast signal from being excluded from the channel search .

That is, the broadcast signal controller 165 according to the embodiment performs the tuning for the signal with the most stable signal state among the PLP signals, thereby preventing the channel search from being skipped due to no tuning. Hereinafter, the operation of the broadcast signal controller 165 will be described in detail.

The broadcast signal controller 165 may perform an auto scan to search for a channel. The auto scan refers to an operation of searching for the entire frequency band or a channel existing in a specific frequency band.

In one embodiment, the broadcast signal controller 165 may perform auto-scan on the entire frequency domain as shown in FIG. That is, the broadcast signal controller 165 may perform an auto-scan to search for broadcast signals by frequency. At this time, the broadcast signal controller 165 can determine the presence or absence of the broadcast signal according to whether sync lock is detected or not, based on sync information of the broadcast signal. Here, the sync lock is a technique for determining the presence or absence of a broadcast signal, and can be performed by a technique well known to those skilled in the art, and there is no limitation.

  For example, in order to determine whether a broadcast signal modulated by an Orthogonal Frequency Division Multiplex (OFDM) scheme is normally received, the synchronization of the received broadcast signal must be detected. At this time, the broadcast signal controller 165 can determine whether or not a broadcast signal exists by checking whether a sync signal is detected in the received broadcast signal.

In order to determine whether or not broadcast information on a plurality of channels is included in the broadcast signal, that is, whether or not the broadcast signal is composed of a plurality of carriers, it is first determined . In other words, if a broadcast signal is to be searched in a specific frequency region through the auto scan, the broadcast signal controller 165 can perform tuning with the channel included in the broadcast signal.

When the broadcast signal is detected, the broadcast signal controller 165 can determine whether a plurality of channel information is included in the searched broadcast signal. That is, whether a broadcast signal based on the DVB-T2 scheme includes information on the number of carriers, that is, how many channels are different for each broadcast signal. At this time, the broadcast signal controller 165 can confirm whether broadcast data about one channel or broadcast data about a plurality of channels is included in the broadcast signal through the sync lock.

If it is determined that broadcast data relating to a plurality of channels is included, the broadcast signal controller 165 should grasp information such as the number of channels and the arrangement of PLPs in which broadcast data is mapped in each frame. At this time, in order to grasp the above-described information, the broadcast signal controller 165 must complete tuning with at least one channel.

At this time, the broadcast signal controller 165 determines tuning as a channel to be tuned for a channel having a good signal state among a plurality of channels, thereby preventing the DVB-T2 frequency band from being completely excluded from the channel search have.

Here, the signal state is based on various parameters. For example, the signal state can be determined based on various parameters such as signal quality, signal to noise ratio (SNR), and received signal strength indication (RSSI) In addition, the signal state can be determined using various known parameters.

Here, the signal quality is determined on the basis of whether the waveform, amplitude, distortion, etc. of the received signal is within the allowable fluctuation limit or the degree of fluctuation. In addition, the signal-to-noise ratio is determined based on the magnitude of the signal-to-noise ratio signal.

For example, the broadcast signal controller 165 may determine a PLP to perform tuning based on a signal state. In one embodiment, FIG. 8 shows a broadcast signal composed of a plurality of PLPs. At this time, the broadcast signal controller 165 may determine the signal state of the PLP and perform the PLP and tuning for the channel m (Chm, m? N) having the strongest received signal strength. Accordingly, the broadcast signal controller 165 can prevent the channel state from being excluded from the channel search because the tuning is not normally performed because the signal state is abnormal or weak.

The broadcast signal controller 165 can perform PLP tuning to acquire information on the arrangement and number of PLPs included in a broadcast signal in a frame, and generate a PLP list based on the information. The broadcast signal controller 165 can determine the tuning order with the PLP through the PLP list, and can perform tuning with a plurality of PLPs based on the tuning order.

According to an embodiment, when broadcast information is included in PLP No. 0, PLP No. 1, PLP No. 3, and PLP No. 5, the broadcast signal controller 165 determines a signal state for each channel information, Can be tuned to a good channel first. If the signal state of the PLP # 3 is most robust, the broadcast signal controller can perform the PLP # 3 tuning.

When the tuning is normally completed, the broadcast signal controller 165 can generate the PLP list using the L1 signaling information related to the intra-frame arrangement of the PLPs. Accordingly, the broadcast signal controller 165 can prevent the specific PLP from being excluded in the tuning by grasping the PLP included in the broadcast signal.

In a case where broadcasting information is included in PLP No. 0, PLP No. 1, No. 3 PLP, and No. 5 PLP, the broadcasting signal controller 165 determines a signal state of each channel information , It is possible to perform tuning to a channel having a good signal state first. If the signal state of the PLP # 3 is the strongest, the broadcast signal controller 165 can perform the PLP # 3 tuning.

Accordingly, the PLP list generated by the broadcast signal control unit 165 using the information included in the L1 signaling information includes information about PLPs 0, 1, 3, and 5. Accordingly, the broadcast signal controller 165 can perform tuning with respect to all the channels included in the broadcast signal by sequentially tuning the PLPs # 0, # 1, and # 5.

The broadcast signal control unit 165 can generate a channel list including channel information by performing tuning with all channels. Accordingly, the broadcast signal controller 165 can support watching a broadcast on a channel the user wants to watch using the channel list.

Specifically, the broadcast signal controller 165 may select a broadcast signal for each channel and convert the selected broadcast signal into a video signal or an audio signal. In addition, the broadcast signal controller 165 may perform a demodulation operation to output a stream signal.

The stream signal may be a signal in which a video signal, an audio signal, and a data signal are multiplexed. For example, the stream signal may be an MPEG-2 stream signal in which an MPEG-2 standard video signal, Dolby AC-3 standard sound signal, etc. are multiplexed.

Of the stream signals output from the broadcast signal control unit 165, a video signal is transmitted to an image processing unit, and an acoustic signal is transmitted to an audio output unit. Accordingly, the display device 1 enables a user to view a broadcast of a desired channel.

As another example, the broadcast signal may be composed of a single PLP. At this time, the broadcast signal may include PLP # 1. In this case, the broadcast signal controller 165 performs tuning for the PLP # 1 having the strongest signal state, so that it is possible to prevent the problem of determining that there is no broadcast signal by performing tuning with the PLP # 0.

Referring to FIG. 2, the broadcast signal receiver 160 may include an RF unit 163. The RF unit 163 can lower the broadcast signal received through the antenna 161 to a base band. Here, the baseband means a low-frequency band. The broadcast signal can be modulated from an external device and transmitted in a high frequency band. Accordingly, the RF unit 163 can lower the frequency band of the broadcast signal to the baseband before demodulating the broadcast signal.

Referring to FIG. 2, the display device 1 may include an image processing unit 200. The image processing unit 200 may process the image information received from the content receiving unit 130 or the broadcast signal receiver 160 and provide the processed image information to the display unit 50. 2, the image processing unit 200 may include a graphic processor 201 and a graphic memory 203. [

The graphic processor 201 can process the image data stored in the graphic memory 203 according to the image processing program stored in the graphic memory 203. [

The graphic memory 203 stores image processing programs and image processing information for image processing or image information output from the graphic processor 201 or image information received from the content receiving unit 130 or the broadcast signal receiver 160 Information can be temporarily stored.

The graphic processor 201 and the graphic memory 203 are not limited to being provided separately from each other and the graphics processor 201 and the graphic memory 203 may be implemented as separate chips, (203) may be provided as a single chip.

The display unit 140 may include a display panel 143 for visually displaying an image, and a display driver 141 for driving the display panel 20.

The display panel 20 may include a pixel as a unit for displaying an image. Each pixel may receive an electrical signal representing the image data and output an optical signal corresponding to the received electrical signal. As described above, the optical signals output by the plurality of pixels included in the display panel 20 are combined, and one image is displayed on the display panel 20.

Also, the display panel 20 can be divided into various types according to the manner in which each pixel outputs an optical signal. For example, the display panel 20 may include a light emitting display that emits light by itself, a transmissive display that intercepts or transmits light emitted from a backlight, or a reflective display that reflects or absorbs light incident from an external light source Can be distinguished.

The display panel 20 may be a cathode ray tube (CRT) display, a liquid crystal display (LCD) panel, a light emitting diode (LED) panel, an organic light emitting diode (OLED) A plasma display panel (PDP), a field emission display (FED) panel, and the like.

However, the display panel 20 is not limited thereto, and the display panel 20 may employ various display means capable of visually displaying an image corresponding to the image data.

The display driver 141 receives the image data from the image processing unit 200 according to the control signal of the main control unit 110 and drives the display panel 20 to display an image corresponding to the received image.

The sound output unit 150 may receive sound information from the content receiving unit 130 or the broadcast signal receiver 160 according to a control signal of the main control unit 110 and may output sounds. At this time, the sound output unit 150 may include one or more speakers 151 for converting an electrical signal into an acoustic signal.

2, the display device 1 may include a main controller 110 including a main memory 133 and a main processor 111. [

The main memory 113 may store a control program and control data for controlling the operation of the display device 1 and may store a user control command received through the input unit 120 or a control signal output from the main processor 111 I can remember it temporarily.

The main processor 111 can control the overall operation of the display device 1. [ For example, the main processor 111 may generate a control signal for controlling the components of the display device 1 to control the operation of each component.

According to an exemplary embodiment, the main processor 111 may transmit a control signal to the broadcast signal receiver 160 according to a channel search command input through the input unit 120 to perform a channel search. In another embodiment, the main processor 111 transmits a control signal to the sound output unit 150 according to the sound control command input through the input unit 120, so that the size of the sound output through the speaker 151 Can be controlled. The main control unit 111 controls the image processing unit 200 to image the image information received from the broadcast signal receiver 160 and displays the image data processed by the display unit 140 Can be controlled.

Meanwhile, the main processor 111 may directly control the operation of the broadcast signal controller 165, and may also directly perform operations performed by the broadcast signal controller 165. For example, the main processor 111 and the broadcast signal controller 165 may be integrated into a single chip. Accordingly, the main processor 111 not only controls the overall operation of the display device 1, but also directly performs the operation of the broadcast signal controller 165 described above.

The main processor 111 can process various data stored in the main memory 113 in accordance with a control program stored in the main memory 113. [ The main processor 111 and the main memory 113 are not limited to the main processor 111 and the main memory 113. The main processor 111 and the main memory 113 may be implemented as separate chips, (113) may be provided as a single chip.

FIG. 9 is a flowchart illustrating an operation of a display apparatus for selecting a PLP to be tuned first in a broadcast signal by DVB-T2 according to an exemplary embodiment and performing tuning sequentially with another PLP based on the selected PLP.

The display device can receive a channel search command from a user. At this time, the display apparatus receives the channel search command for the entire frequency band, or receives the channel search command for the specific frequency band or the specific channel. Accordingly, the display device can perform the channel search for the entire frequency band or the specific frequency band through the auto scan.

For example, the display device can search for a DVB-T2 broadcast signal in the 700 MHz band (900). At this time, the display device can confirm the presence or absence of the DVB-T2 broadcast signal through the sync lock. In one embodiment, the display device can determine the presence or absence of a broadcast signal according to whether sync detection of a broadcast signal through a sync lock is performed.

Also, the display device can determine whether the DVB-T2 broadcast signal retrieved through the scan is a single PLP or a plurality of PLPs. At this time, the display apparatus can determine whether the broadcast signal is composed of a single PLP or a broadcast signal composed of a plurality of PLPs through the sync lock. The method for this can be carried out by various known methods, and there is no limitation.

If the broadcasting signal is composed of a single PLP, that is, if the broadcasting signal includes one channel, the display device can perform tuning for one channel, i.e., through a tuning command for a single PLP (910). At this time, the display apparatus according to the embodiment can perform the tuning with the channel having the best signal state, that is, the most stable among the broadcast signals. Accordingly, even if broadcast data is mapped to PLPs other than PLP No. 0, the display apparatus can normally perform channel tuning.

The display device may generate a channel list including one channel for the DVB-T2 frequency band (915). Then, the display apparatus outputs the stream signal from the tuned channel, converts the output stream signal to broadcast viewing, displays the image information through the display panel, and outputs the sound information through the speaker.

On the other hand, if the broadcasting signal includes a plurality of PLPs, that is, if the broadcasting signal includes a plurality of channels, the display device can check the signal status for each PLP (920). At this time, the display device can check the signal state through various criteria.

For example, the display device may determine the signal state based on the intensity of the received signal, and may transmit a tuning command to the broadcast signal receiver to perform tuning for the PLP having the strongest intensity among the signals of the respective PLPs. As yet another example, the display device may transmit a tuning command to the broadcast signal receiver to perform tuning for the PLP with the highest signal quality, and so on.

Accordingly, the display device can perform robust, i.e. stable PLP and tuning of the signal state, and generate a PLP list (925). For example, the broadcast signal may include 0 to n PLPs (n? 1). At this time, the display apparatus can transmit the tuning command to the broadcast signal receiver so that the signal of the PLP having the highest signal quality among the signals of the PLPs of 0th to n times and the tuning are performed. Accordingly, the display apparatus according to the embodiment can prevent tuning from being performed without trouble even if the signal state of the specific PLP is not good, and excluded in the channel search.

Also, when the display apparatus is tuned with any one of the PLPs, the display apparatus can grasp the information on the PLPs from the L1 signaling information related to the intra-frame arrangement of the plurality of PLPs. Accordingly, the display device can generate the PLP list including information on the PLP. The PLP list includes information on how many times the broadcast information is included in the PLP.

Accordingly, the display device can sequentially perform tuning for all PLPs included in the broadcast signal by transmitting a tuning command for the PLP to the broadcast signal receiver using the PLP list, and generates a channel information list based on the tuning command can do.

10 is a flowchart illustrating an operation of a display apparatus for preventing a channel from being searched according to a signal state according to an exemplary embodiment.

The display device has a display panel for displaying images, and can display image data in various formats. For example, the display device can display image data associated with a broadcast program. Accordingly, the user can receive the broadcast service through the display device.

On the other hand, as described above, the display device can provide not only a broadcast viewing service but also a viewing service related to content downloaded from the outside through a wireless communication network and contents stored in a multimedia storage medium.

For example, the display device may receive various control commands related to the display device from the user through the input unit, and may provide a service corresponding to the received control command. At this time, the display apparatus can receive a command related to the broadcast viewing service from the user through the input unit. Then, the display device can receive the broadcast signal including the content related to the broadcast program through the antenna (1000).

At this time, the display apparatus can receive broadcast signals of various formats through the antenna. For example, a broadcast signal can receive a broadcast signal including one or more channel information through an antenna. That is, the broadcast signal may include broadcast data relating to a single channel or a plurality of channels.

The display device can determine whether the received broadcast signal includes broadcast data relating to a plurality of channels. For example, when the channel search is performed through the auto scan, the display device can recognize the presence or absence of the broadcast signal through the sync lock. Also, the display apparatus can determine whether there are one or more broadcast channels included in the broadcast signal through the sync lock.

If it is determined that broadcast information on a plurality of channels is included, the display device can perform tuning on a channel-by-channel basis. At this time, the display apparatus according to the embodiment can determine the signal state of each channel, and perform tuning with the channel in which the signal state is determined to be the most stable, thereby increasing the probability of success of tuning. Accordingly, the display apparatus can prevent the channels included in the broadcasting signal from being excluded from the channel list because the tuning is not normally completed.

Here, the signal state can be determined according to a parameter that can be a reference or a state in which tuning can be stably performed. In one embodiment, the parameters include, but are not limited to, signal quality, received signal strength, signal-to-noise ratio, and the like, but are not limited to one embodiment and may include various parameters that can determine whether tuning can be performed stably Includes all.

On the other hand, when the channel with the most stable signal state and tuning are normally completed, the display device can grasp information on a frame in which broadcast data for each channel is mapped. For example, the display device can grasp information such as the arrangement and number of frames to which each broadcast data is mapped in the broadcast signal, and generate a list based on the obtained result.

Then, the display device can recognize the number of channels included in the broadcast signal using the list, and determine the tuning order for each channel. Accordingly, the display device can perform normal tuning of all the channels included in the broadcast signal, thereby enabling the user to view the channel included in the broadcast signal.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not restrictive of the invention, as claimed, and it is to be understood that the invention is not limited to the disclosed embodiments.

Also, the terms used herein are used to illustrate the embodiments and are not intended to limit and / or limit the disclosed invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more features, integers, steps, operations, elements, components, or combinations thereof.

It is also to be understood that terms including ordinals such as " first ", "second ", and the like used herein may be used to describe various elements, but the elements are not limited by the terms, It is used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term "and / or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

The terms "unit," "block," "member," "module," and the like used in the entire specification are intended to include at least one Or a unit for processing a function or an operation of the apparatus. For example, hardware such as software, FPGA, or ASIC. However, the meaning of "~", "~", "~ block", "absence", "~ module" is not limited to software or hardware, Quot ;, " block ", "absent "," module ", and the like may be constructions stored in accessible storage medium and performed by one or more processors.

1: display device, 10: main body, 20: display panel

Claims (19)

An antenna for receiving a broadcast signal including broadcast data related to a broadcast program; And
A broadcasting signal controller for performing tuning based on the signal states of the plurality of channels when it is determined that the received broadcast signal includes broadcast data related to a plurality of channels;
And a broadcast signal receiver. The method according to claim 1,
Wherein the broadcast signal controller comprises:
And selects a channel to be tuned in the plurality of channels based on the signal states of the plurality of channels when it is determined that broadcast data related to a plurality of channels is included in the received broadcast signal. 3. The method of claim 2,
Wherein the broadcast signal controller comprises:
And when the tuning with the selected channel is completed, confirms the arrangement and number of frames mapped with the broadcast data in the broadcast signal. The method according to claim 1,
Wherein the broadcast signal controller comprises:
A signal quality, a received signal strength, and a signal-to-noise ratio. The method of claim 3,
Wherein the broadcast signal controller comprises:
And performs channel-specific tuning based on the result of the checking. The method according to claim 1,
Wherein the broadcast signal controller comprises:
And demodulates the broadcast data for each of a plurality of channels included in the broadcast signal to output a stream signal. An antenna for receiving a broadcast signal including broadcast data related to a broadcast program;
A main controller for determining a channel to be tuned based on the signal states of the plurality of channels when it is determined that broadcast data relating to a plurality of channels is included in the received broadcast signal; And
A display panel for displaying a broadcast image image-processed based on a stream signal output through the tuning;
. 8. The method of claim 7,
The main control unit,
And selects a channel from which to issue a tuning command among the plurality of channels based on the signal states of the plurality of channels, when it is determined that broadcast data relating to a plurality of channels is included in the received broadcast signal. 9. The method of claim 8,
The main control unit,
And if the selected channel and the tuning are completed according to the tuning command, confirms the arrangement and number of frames to which broadcast data is mapped in the broadcast signal. 8. The method of claim 7,
Wherein the broadcast signal controller comprises:
And determines a signal state of each channel based on at least one of a signal quality, a strength of a received signal, and a signal-to-noise ratio. 10. The method of claim 9,
The main control unit,
And performs tuning with a plurality of channels included in the broadcasting signal based on the result of the checking. 8. The method of claim 7,
The main control unit,
And demodulates the broadcast data for each of a plurality of channels included in the broadcast signal to output the stream signal. Scanning the broadcast signal by frequency band;
Determining whether the broadcast signal retrieved through the scan includes broadcast data related to a plurality of channels; And
Performing tuning based on the signal states of the plurality of channels if it is determined that broadcast data on the plurality of channels is included in the received broadcast signal; And controlling the display device. 14. The method of claim 13,
Wherein performing the tuning comprises:
Selecting a channel on which a tuning command is to be issued based on the signal states of the plurality of channels if it is determined that broadcast data relating to a plurality of channels is included in the received broadcast signal; And controlling the display device. 15. The method of claim 14,
Wherein performing the tuning comprises:
Confirming the arrangement and number of frames to which broadcast data is mapped in the broadcast signal when tuning with the selected channel is completed according to the tuning command; Further comprising the steps of: 14. The method of claim 13,
Wherein performing the tuning comprises:
The signal quality, the strength of the received signal, and the signal-to-noise ratio. 16. The method of claim 15,
Wherein performing the tuning comprises:
Performing tuning with a plurality of channels included in the broadcasting signal based on the result of the checking; Further comprising the steps of: 14. The method of claim 13,
Wherein performing the tuning comprises:
Demodulating the broadcast data for each of a plurality of channels included in the broadcast signal to output the stream signal; Further comprising the steps of: 14. The method of claim 13,
Wherein performing the tuning comprises:
Displaying the processed broadcast image based on the stream signal output through the tuning; Further comprising the steps of:

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