KR101484784B1 - Display apparatus and method for displaying signal strength - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, and more particularly, to an image display device capable of expressing the intensity of a broadcast signal using an AGC level and a noise level, and a signal strength display method thereof.

According to an embodiment of the present invention, there is provided an image display device including: a broadcast receiver for receiving a broadcast signal input from the outside; An AGC level sensing unit for outputting an AGC level according to the intensity of the broadcast signal received through the broadcast receiver; A noise level sensing unit for sensing a noise level of a broadcast signal received through the broadcast receiver; And a controller for controlling the intensity information of the received broadcast signal to be displayed using any one of the AGC level and the noise level according to the magnitude of the AGC level output through the AGC level sensing unit.

Signal strength, AGC, Noise

Description

[0001] The present invention relates to an image display apparatus and a method for displaying the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, and more particularly, to an image display device capable of expressing the intensity of a broadcast signal using an AGC level and a noise level, and a signal strength display method thereof.

Generally, unlike analog broadcasting, digital broadcasting has a black screen without any noise on the screen unless some signal is inputted into the home. In this case, it is difficult to judge the incoming signal.

The signal strength indication item is placed on the menu item so that the state of the present incoming signal is grasped.

If you watch digital TV or set-top box on the market, you can check the signal strength in menu when watching digital broadcasting.

Some products are marked as steel, medium, and medicine, while others display numbers from 0 to 100.

In such an image display apparatus, the intensity of the broadcast signal is generally displayed according to the AGC level of the input broadcast signal.

However, if the intensity of the broadcast signal is expressed based on the AGC level, the intensity of the broadcast signal can not be accurately expressed below a specific level of the input broadcast signal.

That is, as shown in FIG. 1, since the AGC level is not divided and expressed at the same level below the signal strength of a specific level (generally -65 dB), the user can obtain the accurate intensity of the broadcast signal There was an unknown problem.

The embodiment of the present invention can solve the existing problem that the intensity information of the broadcasting signal is not accurately provided below a certain level.

Further, in the embodiment of the present invention, the problem that the broadcast signal intensity is not classified below a certain level is compensated by measuring the noise level of the broadcast signal, thereby providing more accurate signal intensity information even in a weak electric field.

According to an embodiment of the present invention, there is provided an image display device including: a broadcast receiver for receiving a broadcast signal input from the outside; An AGC level sensing unit for outputting an AGC level according to the intensity of the broadcast signal received through the broadcast receiver; A noise level sensing unit for sensing a noise level of a broadcast signal received through the broadcast receiver; And a controller for controlling the intensity information of the received broadcast signal to be displayed using any one of the AGC level and the noise level according to the magnitude of the AGC level output through the AGC level sensing unit.

According to another aspect of the present invention, there is provided a method of displaying a signal strength of a video display device, including: receiving a broadcast signal; Outputting an AGC level according to the strength of the received broadcast signal; Detecting a noise level of the received broadcast signal; And displaying the intensity information of the broadcasting signal using one of the AGC level and the noise level according to the magnitude of the AGC level outputted.

According to another aspect of the present invention, there is provided a method of displaying a signal strength of a video display device, including: receiving a broadcast signal; Outputting an AGC level according to the strength of the received broadcast signal; Detecting a noise level of the received broadcast signal; And displaying the intensity information of the broadcast signal using the AGC level and the noise level.

In addition, an interface for providing intensity information of a broadcast signal according to an embodiment of the present invention is an interface provided as an OSD screen of an image display device so as to confirm information corresponding to intensity of an input broadcast signal, There is provided an intensity information display region that operates in proportion to the intensity of the broadcast signal, and the intensity information display region includes a first display region operating on the basis of the AGC level of the input broadcast signal, And a second display area for displaying the second display area.

The video display device and the signal strength display method thereof according to the embodiment of the present invention express the intensity information of the input broadcast signal by simultaneously using the AGC level and the noise level of the input broadcast signal, Can be expressed.

That is, the signal strength corresponding to the AGC level and the noise level of the input broadcast signal is determined and the signal strength information corresponding to the AGC level and the noise level is provided, thereby enabling the user to accurately determine the state of the input broadcast signal

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It should be understood, however, that there is no intention to limit the scope of the present invention to the embodiment shown, and that other embodiments falling within the scope of the present invention may be easily devised by adding, Can be proposed.

Although the terms used in the present invention are selected as general terms that are widely used at present, there are some terms selected by the applicant in specific cases. In this case, since the meaning is described in detail in the description of the present invention, It is to be understood that the present invention should be grasped as a meaning of a non-term.

FIG. 2 is a block diagram illustrating a configuration of an image display device according to an embodiment of the present invention. FIG. 3 is a diagram illustrating a change in AGC level and noise level according to electric field intensity in an image display device according to an embodiment of the present invention FIG. 4 is a view illustrating an example of an interface for providing broadcast signal strength information based on an AGC level in an image display apparatus according to an embodiment of the present invention. FIG. 5 is a block diagram of an image display apparatus according to an embodiment of the present invention. FIG. 6 is a flowchart illustrating a method of displaying a signal strength of a video display device according to an exemplary embodiment of the present invention. Referring to FIG. 6, FIG. 7 is a flowchart illustrating a method of displaying a signal strength of a video display device according to a second embodiment of the present invention.

As shown in FIG. 2, the video display device according to the embodiment of the present invention includes a broadcast receiving unit 110 for receiving a broadcast signal input from the outside, and a display unit 110 for displaying the intensity of the broadcast signal received through the broadcast receiving unit 110 An AGC level sensing unit 120 for outputting an AGC level corresponding to the broadcast signal received by the broadcast receiver, a noise level sensing unit 130 for sensing a noise level of a broadcast signal received through the broadcast receiver, A controller 140 for controlling the intensity of the received broadcast signal to be displayed using the AGC level or the noise level according to the size of the AGC level; An OSD generation unit 150 that generates intensity information of a broadcast signal in an OSD format using information of either an AGC level or a noise level; And a display unit 170 for displaying an image signal processed through the image processing unit 160. The display unit 170 displays the image signal processed by the image processing unit 160. [

Hereinafter, the operation of the image display device according to the embodiment of the present invention will be described.

A digital broadcast signal is transmitted in the form of a packetized transport stream by time division multiplexing a video signal, an audio signal, and additional data.

The broadcast receiving unit 110 receives an externally transmitted broadcast signal through an antenna and includes a tuner for tuning a broadcast signal having a frequency band corresponding thereto according to a tuning control signal of a control unit 140 to be described later, And a demodulator for outputting the broadcast signal of the channel in the form of a transport stream through a VSB (Vestigial Sideband) demodulation process and an error correction process.

The broadcast signal received through the broadcast receiver 110 is demultiplexed into a video signal, an audio signal, and various additional data defined by PSIP (Program and System Information Protocol) information by a demultiplexer (not shown) .

The video data separated through the demultiplexing unit (not shown) is processed by the image processing unit 160 and displayed on the display unit 170.

At this time, the image processing unit 160 includes an MPEG-2 decoder and a scaler for converting the video data to a vertical frequency, a resolution, an aspect ratio, etc. according to an output standard of the display unit 31.

The display unit 170 may be applied to various types of display modules such as a digital light processing (DLP), a liquid crystal display (LCD), and a plasma display panel (PDP).

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

The AGC level sensing unit 120 outputs the AGC level according to the intensity of the broadcast signal received through the broadcast receiver 110. [ This is a technique well known in the related art for adjusting the amplification level of the booster according to the intensity of the received broadcast signal, so that detailed description thereof will be omitted.

The noise level sensing unit 130 senses the noise level of the broadcast signal received through the broadcast receiver 120.

Here, the noise level sensing unit 130 is present in a demodulator (not shown) included in the broadcast receiving unit 110. Generally, a demodulator has a register for reading a signal-to-noise ratio (S / N) .

The control unit 140 may receive the intensity information of the received broadcast signal using any one of the AGC level and the noise level according to the AGC level of the broadcast signal output through the AGC level sensing unit 120 Is displayed.

That is, the control unit 140 compares the AGC level of the broadcast signal output through the AGC level sensing unit 120 with a preset reference value, and outputs the received broadcast signal, based on the AGC level or the noise level, So that the intensity information of the signal is displayed.

Here, the predetermined reference value is an AGC level value which is a reference for the weak electric field signal interval of the input broadcast signal.

That is, as shown in FIG. 3, there is a limit in determining the strength of the input broadcast signal based on the AGC level.

In other words, when the field intensity of the input broadcast signal is less than -65 dB (deviation occurs per set), there is no change in the AGC level. Thus, for all signals below -65 dB, Can not be accurately provided.

Accordingly, the controller 140 compares the AGC level with the specific reference value of the section B that can not be identified through the AGC level. If the AGC level value is smaller than the specific reference value, And the intensity information of the broadcasting signal is displayed on the basis of the output AGC level.

Also, as shown in FIG. 3, the noise level in the interval B where the signal strength can not be distinguished through the AGC level is classified according to the intensity of the input broadcast signal.

Accordingly, when the AGC level is greater than a specific reference value (B), the controller 140 controls the noise level detector 130 to detect the noise level of the input broadcast signal, The signal strength information of the input broadcast signal is displayed on the basis of the level.

In other words, the AGC level is used to provide the signal strength information of the broadcast signal for the section A where the electric field intensity of the broadcast signal can be determined through the AGC level, and the electric field intensity of the broadcast signal is determined through the AGC level And provides the signal intensity information of the corresponding broadcast signal using the noise level for the section B which can not be performed.

The OSD generating unit 150 generates the OSD signal intensity information of the received broadcast signal according to the control signal of the controller 140. [

At this time, the signal intensity information screen generated through the OSD generating unit 150 may be provided in the form of a bar graph or may be provided as numerical information according to electric field intensity, and may be variously performed according to the situation.

Hereinafter, a signal intensity information screen of a broadcast signal provided in the form of a bar graph will be described.

As shown in FIG. 4, the signal intensity information screen according to the embodiment of the present invention includes an intensity information display area 200 operating in proportion to the input broadcast signal intensity, A first display region 210 operating on the basis of the AGC level of the input broadcast signal, and a second display region 220 operating on the basis of the noise level of the input broadcast signal.

4, when the AGC level of the input broadcast signal is smaller than a predetermined reference value, the AGC level of the broadcast signal corresponding to the AGC level is displayed on the first display area 210 based on the AGC level Field intensity information is displayed.

5, when the AGC level of the input broadcast signal is greater than a predetermined reference value, the broadcast signal corresponding to the noise level is transmitted through the second display region 220 on the basis of the detected noise level, The electric field strength information of the electric field intensity is displayed.

As a result, the field strength information is displayed in the first display area 210 according to the AGC level of the broadcast signal, and the weak electric field signal is displayed in the second display area 210 according to the noise level of the broadcast signal. And the electric field intensity information is displayed in the display area 220.

As described above, the video display device according to the embodiment of the present invention divides a predetermined section, determines the strength of the broadcast signal based on the AGC level in a specific section, and determines the intensity of the broadcast signal based on the noise level for a specific section.

However, it is also possible to determine the strength of a broadcast signal for all the segments using both the values of the two levels, without dividing the segment for providing the strength of the broadcast signal into the two segments.

In other words, it is possible to analyze the AGC level and the noise level of the received broadcast signal, determine the intensity of the broadcast signal corresponding to the two levels, and provide the intensity information screen according to the determined intensity.

As described above, the video display device according to the embodiment of the present invention expresses the intensity information of the input broadcast signal with the AGC level for a section capable of distinguishing the field intensity through the AGC level of the input broadcast signal, By expressing the intensity information of the input broadcast signal using the noise level in the section where the electric field intensity can not be distinguished through the AGC level, the intensity information of the input broadcast signal can be expressed more accurately even in the weak electric field.

As shown in FIG. 6, the signal strength display method of the video display device according to the first embodiment of the present invention receives the broadcast signal of a specific channel according to user input (S100).

Then, the AGC level according to the strength of the received broadcast signal is output (S110).

The output AGC level is compared with a predetermined reference value, and it is determined whether the output AGC level is greater than a predetermined reference value (S120). That is, the preset specific reference value is an AGC level value that is a reference of the weak electric field interval, and more precisely, a minimum AGC level value of the interval in which the broadcast signal strength can be determined based on the AGC level.

In other words, it is determined whether the field intensity of the input broadcast signal can be determined based on the output AGC level.

If it is determined in operation S120 that the AGC level is less than a preset reference value, the intensity of the received broadcast signal is determined on the basis of the AGC level output in operation S130.

If it is determined in operation S120 that the AGC level is greater than a preset reference value, the controller 100 senses the noise level of the received broadcast signal in operation S140.

Then, the strength of the received broadcast signal is determined based on the detected noise level.

Then, a signal intensity information screen according to the intensity information of the input broadcast signal determined based on the AGC level or the noise level is displayed (S160).

That is, if the AGC level of the input broadcast signal is less than a predetermined reference value, the field strength information of the broadcast signal corresponding to the AGC level is displayed. If the AGC level of the input broadcast signal is greater than a predetermined reference value Field strength information of a broadcast signal corresponding to the sensed noise level.

Also, in the method of displaying the signal strength of the video display device according to the second embodiment of the present invention configured as described above, a broadcast signal of a specific channel according to user input is received (S200).

Then, the AGC level according to the strength of the received broadcast signal is output (S210).

Then, a noise level of the received broadcast signal is sensed (S220).

Then, the signal intensity corresponding to the two values is determined using the output AGC level and the sensed noise level (S230).

Then, a signal strength information screen according to the determined signal strength is displayed (S240).

As described above, in the method of displaying the signal intensity of the video display device according to the embodiment of the present invention, the intensity information of the input broadcast signal is expressed with the AGC level for a section capable of distinguishing the electric field strength through the AGC level of the input broadcast signal The intensity information of the input broadcast signal can be expressed more accurately even in the weak electric field by expressing the intensity information of the input broadcast signal using the noise level for the section where the electric field strength can not be distinguished through the AGC level of the input broadcast signal.

That is, the signal strength corresponding to the AGC level and the noise level of the input broadcast signal is determined and the signal strength information corresponding to the AGC level and the noise level is provided, so that the user can accurately determine the state of the input broadcast signal.

1 is a diagram illustrating a change in an AGC level according to electric field intensity in a conventional image display device.

2 is a block diagram showing the configuration of a video display device according to an embodiment of the present invention;

3 is a diagram illustrating a change in an AGC level and a noise level according to electric field intensity in a video display device according to an embodiment of the present invention.

4 is a view illustrating an example of an interface for providing intensity information of a broadcast signal based on an AGC level in an image display device according to an embodiment of the present invention.

5 is a view illustrating an example of an interface for providing intensity information of a broadcast signal based on a noise level in an image display device according to an embodiment of the present invention.

FIG. 6 is a flowchart illustrating a method of displaying a signal strength of a video display device according to a first embodiment of the present invention.

FIG. 7 is a flowchart illustrating a method of displaying a signal strength of a video display device according to a second embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

110: Broadcast receiver 120: AGC level detector

130: Noise Level Detection Unit 140:

150: OSD generating unit 160:

170:

Claims (14)

A broadcast receiving unit for receiving a broadcast signal input from the outside; An AGC level sensing unit for outputting an AGC level according to the intensity of the broadcast signal received through the broadcast receiver; A noise level sensing unit for sensing a noise level of a broadcast signal received through the broadcast receiver; And A controller for comparing the AGC level of the received broadcast signal with a preset reference value and providing intensity information of the broadcast signal using any one of the output AGC level and the sensed noise level according to the comparison result, Containing Video display device. delete The method according to claim 1, Wherein the predetermined reference value is an AGC level value which is a reference of a weak electric field signal period. The method of claim 3, Wherein the control unit controls the signal strength information to be displayed based on the AGC level if the AGC level is smaller than the reference value and controls the signal strength information to be displayed based on the noise level when the AGC level is greater than the reference value. Video display device. 5. The method of claim 4, Wherein the signal intensity information displayed on the basis of the AGC level is signal intensity information of a strong-field section and the medium-field section and the signal intensity information displayed on the basis of a noise level is signal intensity information of a weak field section. . Receiving a broadcast signal; Outputting an AGC level according to the strength of the received broadcast signal; Comparing an AGC level of the received broadcast signal with a preset reference value; Detecting a noise level of the received broadcast signal; And And displaying the intensity information of the broadcast signal using any one of the AGC level and the noise level according to a result of comparison between the AGC level and a preset reference value A method of displaying a signal strength of a video display device. delete The method according to claim 6, The predetermined reference value is an AGC level value that is a reference of the weak electric field signal period A method of displaying a signal strength of a video display device. The method according to claim 6, The step of displaying the intensity information of the broadcast signal Displaying the signal strength information based on the AGC level of the broadcast signal if the output AGC level is less than a reference value; And displaying the signal strength information based on the noise level of the broadcast signal if the output AGC level is greater than a reference value A method of displaying a signal strength of a video display device. 10. The method of claim 9, The step of displaying the signal strength information based on the AGC level may include the step of displaying signal strength information according to a broadcast signal of a strong-current system interval and a medium- Wherein the step of displaying the signal intensity information based on the noise level is a step of displaying signal intensity information on a broadcast signal of a weak electric field period. Receiving a broadcast signal; Outputting an AGC level according to the strength of the received broadcast signal; Detecting a noise level of the received broadcast signal; And And displaying the intensity information of the broadcast signal using the AGC level and the noise level, The step of displaying the intensity information of the broadcast signal Analyzing the AGC level and the noise level; Determining a signal strength corresponding to the analyzed AGC level and noise level, And providing intensity information of the received broadcast signal based on the determined signal strength A method of displaying a signal strength of a video display device. delete 1. An interface provided as an OSD screen of a video display device so as to confirm information corresponding to an intensity of an inputted broadcast signal, There is an intensity information display area that operates in proportion to the intensity of the input broadcast signal, Wherein the intensity information display area includes a first display area operating on the basis of an AGC level of an input broadcast signal, And a second display area that operates based on a noise level of the input broadcast signal. 14. The method of claim 13, Wherein intensity information corresponding to an AGC level of an input broadcast signal is displayed in the first display area, And intensity information corresponding to a noise level of an input broadcast signal is displayed in the second display area.

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