KR20110009573A - Display apparatus and channel searching method - Google Patents

Abstract

PURPOSE: A display apparatus and a channel searching method are provided to relatively increase the speed when searching a channel. CONSTITUTION: A channel searching method comprises the steps of: receiving a first broadcasting signal according to an automatic channel searching command(S210); analyzing the received first broadcasting signal; and judging the transfer standard of the received first broadcasting signal; and setting up the channel searching mode for automatically searching a channel according to the transfer standard of the first broadcasting signal(S240).

Description

DISPLAY APPARATUS AND CHANNEL SEARCHING METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display apparatus, and more particularly, to a display apparatus and a channel searching method thereof capable of performing channel searching in accordance with a transmission standard of an input broadcast signal.

BACKGROUND In general, a display device includes a television, and in recent years, a television technology has developed a method of transmitting broadcast signals due to the development of broadcast technology, and accordingly, interest in digital television using a digital transmission method has increased.

Digital televisions transmit analog broadcast signals in digital form, minimizing the effects of noise and facilitating the reproduction of the original image.

Recently, such a display device can receive various broadcast channels through cable or satellite broadcasting, unlike the past, which can only receive over-the-air channels, thus providing a user with at least 50 channels and more than 100 channels.

In addition, the user may perform automatic channel search when a channel search is required due to a first installation of a display device or a change in signal environment.

Here, the automatic channel search refers to a technique of sequentially determining whether a channel is valid from a starting channel number to a last channel number, and thus configuring a channel map based on valid channel information.

On the other hand, DVB (Digital Video Broadcasting) system, one of the digital broadcast transmission and reception system is a European terrestrial digital broadcasting method, and transmits and receives a broadcast signal using an Orthogonal Frequency Division Multiplexing (OFDM) method. Such digital broadcast transmission and reception systems are tending to be subdivided into various types of standards according to the development of technology and various needs of users. Currently, digital broadcasting transmission / reception systems are standardized in, for example, DVB-T, DVB-S, DVB-C, and the like, and provide different types of services.

Accordingly, prior to executing the channel search function, the normal channel search function has been provided only when the transmission standard of the broadcast signal for channel search is selected in advance.

Therefore, the user may have to select a transmission standard of an input broadcast signal in advance before executing the channel search function. If the transmission standard is incorrectly selected, it is inconvenient to perform channel search again from the beginning. there was.

According to an embodiment of the present invention, a display apparatus capable of automatically determining a transmission standard of an input broadcast signal and constituting a channel list by a channel search method corresponding to the determined transmission standard may be provided. do.

 The technical problems to be achieved in the proposed embodiment are not limited to the technical problems mentioned above, and other technical problems not mentioned above are clear to those skilled in the art to which the proposed embodiments belong from the following description. Can be understood.

A control method of a display apparatus according to an exemplary embodiment of the present invention includes receiving a first broadcast signal according to an automatic channel search command input from an external device; Analyzing the received first broadcast signal to determine a transmission standard of the received first broadcast signal; Setting a channel search mode for the automatic channel search according to the determined transmission standard of the first broadcast signal; And performing a channel search in the set channel search mode.

In addition, the display device according to an embodiment of the present invention includes a broadcast signal receiving unit for receiving a broadcast signal provided from the outside; A transmission standard determination unit determining a transmission standard of an input broadcast signal based on the first broadcast signal received through the broadcast signal receiver; And a controller for controlling the automatic channel search operation to be performed in the channel search mode corresponding to the determined transmission standard.

According to an embodiment of the present invention, the channel search is automatically performed corresponding to the transmission standard of the input broadcast signal when the channel is searched, so that the user does not need to select the transmission standard of the input broadcast signal in advance, thereby providing a relatively fast channel search speed. It has the effect of improving the haptic speed.

The proposed embodiment will be described.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the spirit of the present invention is not limited to the embodiments presented, and other inventions which are further deteriorated by addition, change, deletion, etc. of other components, or other embodiments included within the scope of the present invention can be easily made. I can suggest.

The term used in the present invention was selected as a general term widely used as possible, but in some cases, the term is arbitrarily selected by the applicant, in which case the meaning is described in detail in the description of the invention, the name of a simple term It should be clear that the present invention is to be understood as a meaning of terms.

In other words, in the following description, the word 'comprising' does not exclude the presence of other elements or steps than those listed.

1 is a diagram illustrating a configuration of a display apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 1, a display apparatus according to an exemplary embodiment of the present invention may include a broadcast signal receiver 100, an image processor 110, a display 120, a transmission standard determiner 130, a controller 140, and a storage unit. And 150.

The broadcast signal receiver 100 receives a broadcast signal of a specific channel according to a user request among broadcast signals transmitted from the outside.

That is, the broadcast signal receiver 100 receives a broadcast signal transmitted from the outside, and tunes a tuner for tuning a broadcast signal having a frequency band corresponding thereto according to a tuning control signal of the controller 140 to be described later. A demodulator for outputting a broadcast signal of a specific channel in the form of a transport stream through a VSB (Vestigial Sideband) demodulation process and an error correction process, and separating the output transport stream into video data, audio data and various additional data It may include a demultiplexer for outputting in the form of a bit stream.

The video data separated by the demultiplexer is processed by the image processor 110 and displayed on the display 120.

In this case, the image processing unit 110 includes an MPEG-2 decoder and a scaler for converting video data to match the vertical frequency, resolution, aspect ratio, etc., of the output standard of the display 120.

The display unit 120 may be applied to various types of display modules such as digital light processing (DLP), liquid crystal display (LCD), plasma display panel (PDP), and the like.

The audio data is processed by a separate voice signal processor (not shown) and output to a speaker (not shown). The audio processor may include an AC-3 decoder.

The transmission standard determiner 130 determines the transmission standard of the broadcast signal received through the broadcast signal receiver 100.

That is, the DVB (Digital Video Broadcasting) system, which is one of digital broadcasting transmission / reception systems, is a terrestrial digital broadcasting system for Europe, and transmits and receives a broadcast signal using an orthogonal frequency division multiplexing (OFDM) system. Such digital broadcast transmission and reception systems are tending to be subdivided into various types of standards according to the development of technology and various needs of users. Current digital broadcast transmission and reception systems include, for example, the Digital Video Broadcasting-Terrstrial (DVB-T) standard, the Digital Video Broadcasting-Terrstrial 2 (DVB-T2) standard, the Digital Video Broadcasting-Satellite (DVB-S) standard, and the DVB- There are methods such as C (Digital Video Broadcasting-Cable) standard, and they provide different types of services.

Here, the DVB-T may be referred to as terrestrial broadcasting using an antenna, and the DVB-C may be referred to as a cable broadcasting concept using a cable.

However, since the two methods have different channel search methods and different signals transmitted from broadcasting stations, the user generally decides whether to perform the channel search in the DVB-T method or the DVB-C method. I had to.

However, in the embodiment according to the present invention, the transmission standard determination unit 130 determines the transmission standard of the input broadcast signal based on the first received broadcast signal, and searches for a channel in a channel search mode corresponding to the determined transmission standard. Allows you to perform an action.

That is, the transmission standard determination unit 130 performs a channel search operation in a channel search mode corresponding to a specific transmission standard on the first received broadcast signal, and accordingly whether or not the received broadcast signal is locked. Accordingly, the transmission standard of the broadcast signal is determined.

Here, the first received broadcast signal is not a general broadcast signal, but means a broadcast signal (hereinafter, referred to as a first broadcast signal) of a channel in which a valid signal exists.

That is, a display apparatus generally includes a tuner, and the tuner can determine whether or not a valid broadcast signal exists in a specific channel provided by a broadcast station by using the concept of AGC_Lock.

In other words, if a valid signal exists, the tuner may determine whether the signal is a valid signal regardless of a transmission standard of the corresponding signal, that is, whether a valid broadcast signal exists in a specific channel.

After all, if a broadcaster is transmitting a signal of a predetermined level, the tuner is designed to determine whether a valid signal exists or not in the corresponding channel although it does not know what the standard of the broadcast signal is.

Here, the channel search is performed according to the selected transmission standard after previously selecting whether to perform channel search with DVB-T or channel search with DVB-C.

However, in the present invention, when a user inputs a channel search command, reception of a broadcast signal corresponding to the first channel is started through the tuner (broadcast signal receiver), and the tuner determines whether the received broadcast signal is valid or not. The determination is made, and information on this is output.

Accordingly, when a broadcast signal valid in a specific channel is detected through the sequential broadcast signal reception from the first channel, the broadcast signal receiver 100 provides information on this to the transmission standard determination unit 130. That is, when the first broadcast signal is detected, the broadcast signal receiving unit 100 provides the transmission standard determination unit 130 with information about the detected first broadcast signal.

When the information about the first broadcast signal is provided, the transmission standard determination unit 130 performs a channel search operation of the first broadcast signal according to a specific channel search mode set as a default.

That is, in general, the broadcast signal receiving unit 100, more specifically, the demodulation unit is set in advance to meet the transmission standard of each broadcast signal. Accordingly, if the preset transmission standard and the channel search mode set through the transmission standard determination unit do not match, the first broadcast signal, which is the valid signal, is not normally received (locked).

Accordingly, the transmission standard determination unit 130 determines the transmission standard of the first broadcast signal based on the state of the first broadcast signal received according to the specific channel search mode.

The controller 140 controls the overall operation of the display apparatus.

That is, when a channel search command is input, the control unit 140 determines the transmission standard of the input broadcast signal through the transmission standard determination unit 130. When the transmission standard of the input broadcast signal is determined, the determined The channel search operation is performed in the channel search mode corresponding to the transmission standard.

In other words, if the determined transmission standard is a DVB-T standard, the controller 140 performs a channel search operation in a first channel search mode, and if the determined transmission standard is a DVB-C standard, a second channel The channel search operation is performed in the search mode.

The storage unit 150 stores the result information according to the channel search operation performed by the control of the controller 140. That is, the storage unit 150 stores the channel map configured by the channel search operation.

Hereinafter, the operation of the display apparatus according to an exemplary embodiment of the present invention configured as described above will be described in detail.

2 is a flowchart illustrating a step-by-step method of searching a channel of a display apparatus according to an exemplary embodiment of the present invention.

2, in the channel searching method of the display apparatus according to an exemplary embodiment of the present disclosure, first, the controller 140 determines whether a channel searching command is input from the outside (step 200). That is, the controller 140 determines whether a channel search shortcut key provided separately to the remote controller is input or whether an automatic channel search menu item is selected on a menu screen.

3 is a diagram illustrating an example of a channel search setting screen formed according to an embodiment of the present invention.

Referring to FIG. 3, generally, the channel related menu 300 includes an automatic channel menu 310, a manual channel menu 320, a channel editing menu 330, and a data broadcasting menu 340.

The automatic channel menu 310 performs a channel search operation in a channel search mode corresponding to a transmission standard of an input broadcast signal, and configures a channel map composed of channel information in which a valid signal exists. When the automatic channel menu is selected, the controller 140 controls the channel search operation of the broadcast signal receiver 100.

At this time, when the antenna connection is abnormal at the antenna input of the corresponding display device, the cable connection is abnormal at the cable input, or when a valid channel is not searched after the automatic channel execution, the information is provided to the user through a message box. So that the user can check the antenna or cable connection.

The manual channel menu 320 is a menu for executing a search operation on the input channel manually by inputting a channel number of a user. It is also used to delete a specific channel from the channel map of channel editing.

In addition, when an indoor or outdoor antenna is used, a valid signal may or may not be inputted through a specific channel according to the direction of the installation antenna. Therefore, since all channels cannot be searched normally using only the automatic channel menu, The manual channel menu is used to search for a specific channel.

The channel edit menu 330 is used to execute a channel editing function such as channel storage, channel deletion, and favorite channel registration.

If the channel search command is input, the controller 140 causes the broadcast signal receiver 100 to receive a first broadcast signal (step 210). That is, the broadcast signal receiving unit 100 performs a channel search from the first channel (the channel of the lowest frequency band) and receives the broadcast signal of the first channel in which the valid signal exists.

When the first broadcast signal is received, the transmission standard determination unit 130 sets a channel search mode to a specific channel search mode, and receives the received first signal through the broadcast signal receiver 100 according to the set channel search mode. In step 220, a channel search operation of a broadcast signal is performed. Accordingly, the broadcast signal receiver 220 receives the first broadcast signal corresponding to the set specific channel search mode.

Subsequently, the transmission standard determination unit 130 determines whether the first broadcast signal received through the broadcast signal receiver 220 is normally received according to the set channel search mode (step 230).

If the first broadcast signal is normally received, the transmission standard determination unit 130 determines the transmission standard of the first broadcast signal according to the set channel search mode, and accordingly, the control unit 140 determines the determination. The channel search mode is set to correspond to the transmitted transmission standard (step 240). That is, since the first broadcast signal is normally received in the set specific channel search mode, the controller 140 determines that the channel search mode is normally set, and maintains the set channel search mode as it is.

In addition, if the first broadcast signal is not normally received, the transmission standard determination unit 130 determines a transmission standard of the first broadcast signal according to the set channel search mode, and accordingly, the control unit 140 determines the The channel search mode is set to correspond to the determined transmission standard (step 250). That is, since the first broadcast signal is not normally received in the set specific channel search mode, the controller 140 determines that the channel search mode is abnormally set and changes the set channel search mode.

In operation 260, the controller 140 performs a channel search operation in the set channel search mode. The channel search operation according to the set channel search mode will be described in detail below.

4 is a flowchart illustrating a method of determining a transmission standard of a display apparatus according to an exemplary embodiment of the present disclosure.

Referring to FIG. 4, the transmission standard determination unit 130 first performs a channel search in a first channel search mode (step 400). Here, the first channel search mode is a channel search mode corresponding to the DVB-T standard. The second channel search mode is a channel search mode corresponding to the DVB-C standard.

The broadcast signal receiving unit 100 receives the first broadcast signal corresponding to the first channel search mode set through the transmission standard determining unit 130 (step 410).

The transmission standard determination unit 130 checks whether the first broadcast signal is normally received through the broadcast signal receiving unit 100 (step 420).

In addition, if the first broadcast signal is normally received, the transmission standard determination unit 130 determines the transmission standard of the first broadcast signal as DVB-T, and transmits the determined transmission standard information to the controller 140. (Step 430).

Then, the controller 140 sets the channel search mode in response to the transmitted transmission standard information. That is, since the determined transmission standard information is a DVB-T standard, the control unit 140 performs a channel search operation in a first channel search mode corresponding to the DVB-T standard (step 440).

Meanwhile, if the first broadcast signal is abnormally received, the transmission standard determination unit 130 determines the transmission standard of the first broadcast signal as DVB-C, and transmits the determined transmission standard information to the controller 140. (Step 450).

Then, the controller 140 sets the channel search mode in response to the transmitted transmission standard information. That is, since the determined transmission standard information is a DVB-C standard, the control unit 140 performs a channel search operation in a second channel search mode corresponding to the DVB-C standard (step 460).

 Meanwhile, although the channel search mode set in the step (400) is defined as the first channel search mode, the transmission standard of the first broadcast signal may be determined after setting the channel search mode to the second channel search mode. There will be.

5 is a flowchart illustrating a step-by-step method for searching a channel according to the first channel search mode of the display device according to an exemplary embodiment of the present invention.

Referring to FIG. 5, when the first channel search mode is set through the controller 140 (operation 500), the broadcast signal receiver 100 sets a reception channel for the channel discovery (operation 510). That is, the broadcast signal receiving unit 100 sets the channel having the lowest frequency as the reception channel if a previously received channel does not exist. In addition, if a previously received channel exists, the broadcast signal receiving unit 100 sets the next channel of the previous receiving channel as the channel to be currently received.

The controller 140 checks whether the received broadcast signal of the channel is valid (step 520).

If the received broadcast signal is valid, the controller 140 configures a channel map by registering information of a channel on which the broadcast signal is received in a channel list (step 530).

In addition, the controller 140 checks whether broadcast signals of all channels are received, and if the broadcast signals of all channels are received, ends the channel search operation, or returns to the next channel (step 510). In step 540, the channel search operation is continuously performed.

6 is a flowchart illustrating a step-by-step method for searching a channel according to a second channel search mode of a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 6, when the second channel search mode is set through the control unit 140 (step 600), the broadcast signal receiving unit 100 receives a broadcast signal of a specific channel in which NIT information exists (610). step). In other words, in the DVB-C standard, NIT information is transmitted to a broadcast signal of a specific channel (Homing Mux). Here, the NIT information includes frequency information of a channel having a valid broadcast signal.

If the broadcast signal is received through the broadcast signal receiver 100, the controller 140 extracts NIT information included in the received broadcast signal (step 620).

The control unit 140 constructs a channel list using the frequency information included in the extracted NIT information (step 630).

According to an embodiment of the present invention, the channel search is automatically performed corresponding to the transmission standard of the input broadcast signal when the channel is searched, so that the user does not need to select the transmission standard of the input broadcast signal in advance, thereby providing a relatively fast channel search speed. It has the effect of improving the haptic speed.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1 is a view showing the configuration of a display device according to an embodiment of the present invention.

2 is a flowchart illustrating a step-by-step method for searching a channel of a display apparatus according to an exemplary embodiment of the present invention.

3 is a diagram illustrating an example of a channel search setting screen formed according to an embodiment of the present invention.

4 is a flowchart illustrating a method of determining a transmission standard of a display apparatus according to an exemplary embodiment of the present invention.

5 is a flowchart illustrating a step-by-step method for searching a channel according to a first channel search mode of a display apparatus according to an exemplary embodiment of the present invention.

6 is a flowchart illustrating a step-by-step channel search method according to a second channel search mode of a display device according to an exemplary embodiment of the present invention.

Claims (10)

Receiving a first broadcast signal according to an automatic channel search command input from the outside; Analyzing the received first broadcast signal to determine a transmission standard of the received first broadcast signal; Setting a channel search mode for the automatic channel search according to the determined transmission standard of the first broadcast signal; And, And performing a channel search in the set channel search mode. The method of claim 1, And the first broadcast signal is a broadcast signal of a first channel in which a valid signal exists. The method of claim 1, The transmission standard is a channel searching method of a display device including a digital video broadcasting (terbtrial) standard DVB-C (digital video broadcasting-cable) standard. The method of claim 3, wherein The channel search mode includes a first channel search mode corresponding to the DVB-T standard and a second channel search mode corresponding to the DVB-C standard. The method of claim 4, wherein The determining of the transmission standard Receiving the first broadcast signal in a first channel search mode; Determining the transmission standard as a DVB-T standard when the first broadcast signal is normally received; And if the first broadcast signal is abnormally received, determining the transmission standard as a DVB-C standard. The method of claim 4, wherein The determining of the transmission standard Receiving the first broadcast signal in a second channel search mode; If the first broadcast signal is normally received, determining the transmission standard as a DVB-C standard; And if the first broadcast signal is abnormally received, determining the transmission standard as a DVB-T standard. A broadcast signal receiving unit receiving a broadcast signal provided from the outside; A transmission standard determination unit determining a transmission standard of an input broadcast signal based on the first broadcast signal received through the broadcast signal receiver; And, And a controller configured to control an automatic channel search operation to a channel search mode corresponding to the determined transmission standard. The method of claim 7, wherein And the controller sets the effective broadcast signal initially received through the broadcast signal receiver as the first broadcast signal. The method of claim 7, wherein If the determined transmission standard is a DVB-T standard, the controller performs a channel search in a first channel search mode. If the determined transmission standard is a DVB-C standard, the controller performs a channel search in a second channel search mode. Display device characterized in that. The method of claim 9, The first channel search mode is a mode for constructing a channel list according to whether a broadcast signal received sequentially for each frequency is valid. The second channel search mode is a mode for configuring a channel list by using additional information included in a broadcast signal of a specific channel.

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