KR101652441B1

KR101652441B1 - Video display apparatus and method of identifying input signal of component

Info

Publication number: KR101652441B1
Application number: KR1020090066719A
Authority: KR
Inventors: 양진모
Original assignee: 엘지전자 주식회사
Priority date: 2009-07-22
Filing date: 2009-07-22
Publication date: 2016-08-30
Also published as: KR20110009357A

Abstract

The present invention relates to a video display device and a method of recognizing a component input signal, the method comprising: receiving a component video signal through an input terminal; Separating a synchronizing signal from the input component video signal; Comparing the level of the separated sync signal with a preset threshold value; And adjusting a predetermined threshold according to a result of the comparison to detect a synchronization signal of the component video signal.

Accordingly, the present invention provides a video display apparatus that receives a component signal so that a normal image is output by automatically adjusting a threshold for detecting a level of a component synchronizing signal according to an input source apparatus, thereby compensating for a difference in synchronizing signals between the apparatuses.

Component, synchronization signal, threshold

Description

[0001] The present invention relates to a video display apparatus and a method for recognizing a component input signal,

The present invention relates to an image display apparatus and a method for recognizing a component input signal, and more particularly, to an image display apparatus for automatically adjusting a threshold value for detecting a component synchronous signal according to an input signal, &Lt; / RTI >

In recent years, modern society has developed rapidly in the field of information and communication, electronics, and the Internet due to the development of digital technology, and has come up with a high information age. In the past, by acquiring information by simple contact, And the information necessary for them can be provided in real time. In addition, digital TVs, which are basically provided for each household, are also rapidly digitized, and digital TVs are becoming a medium for providing information storage and information efficiently and enormously.

In order to know the true taste of HD broadcasting on such TVs, you should connect your TV and set-top box with 'component cable' instead of general video cable. The component cable is also referred to as a chrominance separation signal cable. It separates the C (color) signal into Cb (Pb) and Cr (Pr) literally and puts a separate luminance (Y) signal cable. .

That is, in general, a component input of a TV is represented by a component Y / Cb / Cr, Y is a brightness signal such as a monochrome image, and Cb / Cr is a chrominance signal corresponding to blue / red. At this time, since the Y signal includes the H / V sync signal, the video can be properly displayed on the TV without a separate sync signal.

The conventional TV uses a fixed threshold value to detect a sync signal from a component signal, and when an input source device that outputs a signal lower than a threshold value of the TV is connected to allow the component signal to be processed when the sync level of the input signal is equal to or higher than the threshold, Problems such as no signal or image breakage occur.

The present invention provides an image display device for compensating a level difference of a component synchronizing signal according to an input source apparatus and a method for recognizing a component input signal.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible.

According to an aspect of the present invention, there is provided a video display device including: a component input terminal for receiving a component video signal from the outside; A sync level detector for detecting a sync signal by separating a sync signal from the input component video signal and comparing the sync signal level of the separated component video signal with a preset threshold value; And a threshold setting unit for setting the threshold value to a predetermined reference value according to the level of the separated sync signal.

And a controller for performing a fine adjustment step for compensating for a detected component sync signal level when the level of the separated sync signal is less than a preset threshold value.

And the predetermined threshold value is in the range of 100 mV to 300 mV.

Wherein the threshold setting unit resets the threshold to a value reduced by a predetermined unit from the predetermined threshold when the predetermined threshold value is in a range of 100 mV or more and less than 300 mV.

And the threshold setting unit repeats the threshold reset until the reset threshold is equal to or less than the component sync signal level.

The threshold value setting unit sets a predetermined reference value reduced by 8 mV at the predetermined threshold value.

When the predetermined threshold value is 300 mV, the threshold value setting unit sets the detected value of the detected component synchronous signal to the threshold default value.

And a scaler for detecting the sync signal and processing the input component video signal when the level of the separated sync signal is greater than or equal to a preset threshold value.

Wherein the scaler detects a color signal size of the input component video signal and sets the largest color signal of the detected component video signal to a white level when the size of the color signal is larger than the synchronous signal ratio of the component video signal And implements full white of the input component video signal.

The color signal size of the component video signal is measured as a color signal level.

The color signal size of the component video signal is transmitted as field information.

According to another aspect of the present invention, there is provided a method of recognizing a component input signal of a video display device, comprising: receiving a component video signal through an input terminal; Separating a synchronizing signal from the inputted component video signal; Comparing the level of the separated sync signal with a preset threshold value; And adjusting a predetermined threshold according to a result of the comparison to detect a synchronization signal of the component video signal.

If the level of the separated sync signal is smaller than a predetermined threshold value, a fine adjustment step is performed to compensate for the detected component sync signal level.

And the predetermined threshold value is in the range of 100 mV to 300 mV.

If the predetermined threshold value is in a range of 100 mV or more and less than 300 mV, the threshold value is reset to a value reduced by a predetermined unit from the preset threshold value.

The threshold resetting step is repeated until the reset threshold is equal to or less than the component sync signal level.

And decreasing by 8 mV at the predetermined threshold value.

If the preset threshold value is 300 mV, the control component sync signal level is set as the threshold default.

And detects the sync signal and processes the input component video signal if the level of the separated sync signal is greater than or equal to a preset threshold value.

Detecting a synchronization signal from the input component video signal by automatically adjusting the threshold value according to the level of the separated synchronization signal; Detecting a color signal size of the component video signal; Setting a largest color signal of the detected component video signal to a white level when the detected color signal magnitude is greater than a synchronous signal ratio of the input component video signal; And implementing a full-white of the input component video signal.

And a color signal level of the component video signal is measured as a color signal level.

And a color signal size of the component video signal is transmitted as field information.

The present invention has an effect of automatically outputting a normal image by compensating for a difference in synchronizing signals between devices by automatically adjusting a threshold for detecting the level of a component synchronizing signal according to an input source apparatus on a television receiving a component signal.

The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is an internal block diagram of an image display apparatus for recognizing a component input signal according to the present invention.

1, a component signal processing apparatus of an image display apparatus includes a component input terminal 11, a synchronization level detection unit 12, a threshold value setting unit 13, a control unit 14, an A / D conversion unit 15, A scaler 16, and a display unit 17.

The component input terminal 11 receives a component video signal from the outside. At this time, it is composed of three ports for inputting the detection Y signal, Cb signal and Cr signal, and the user connects to the corresponding port by using the component cable.

The sync level detector 12 separates the horizontal / vertical sync signal from the luminance signal Y of the component video input through the component input terminal 11 and outputs the horizontal / vertical sync signal level of the separated component video signal to the set threshold value . Here, the sync level detector 12 detects a normal component video signal when the horizontal / vertical sync signal level of the input component video signal is greater than a preset threshold value.

The threshold value setting unit 13 sets a threshold value having a value within a certain range such that the horizontal / vertical synchronizing signal level of the detected component video signal is equal to or greater than a threshold value.

The controller 14 instructs the threshold value setting unit 13 to set a threshold value that is a certain range value so that the component horizontal / vertical synchronizing signal level is equal to or higher than the threshold value to detect the horizontal / vertical synchronizing signal level of the component video signal in the synchronous level detecting unit 12 Adjust automatically. At this time, the predetermined threshold value range of the video display device of the present invention has a value of 100 mV or more and 300 mV or less. If the component horizontal / vertical synchronizing signal level is smaller than the predetermined threshold value and the predetermined threshold value is 100 mV or more, the predetermined threshold value is reset to a predetermined unit and reset. The reset threshold is set to be less than or equal to the input component horizontal / vertical sync signal level. When the predetermined threshold value is 300 mV, the threshold value is set as a default value by adjusting the input component horizontal / vertical synchronizing signal level value.

The A / D converter 15 converts the component video signal input through the component input terminal 11 and the component horizontal / vertical synchronizing signal detected through the synchronization level detector 12 into an 8-bit digital signal.

The scaler 16 formats the component video signal output from the A / D converter 15 and outputs the formatted video signal to the display unit 17. In addition, in the present invention, the scaler 16 detects the color signal size of the input component video signal, and when the size of the color signal is larger than the sync signal ratio of the component video signal, the scaler 16 converts the largest color signal of the detected component video signal into white Level to implement full white of the input component video signal. At this time, the color signal size of the component video signal is measured as a color signal level or transmitted as field information together with the video signal through the component input terminal 11. [

2 is an exemplary diagram illustrating a step of detecting a synchronization signal of a component input signal according to an exemplary embodiment of the present invention.

According to the present invention, when the component horizontal / vertical synchronizing signal level is lower than a predetermined threshold value of the video display device in a state that a video display device such as a TV is connected to a component input source device, To the OSD message (21).

3 is a flowchart illustrating a method of recognizing a component input signal according to an exemplary embodiment of the present invention.

First, when an input mode for outputting a component video is selected, the video display device receives the component video signals Y, Cb, and Cr through corresponding input terminals (S301).

The component horizontal / vertical synchronizing signal is separated from the luminance (Y) signal of the input component video signal (S302).

The level of the separated component horizontal / vertical synchronizing signal is compared with a predetermined threshold (S303).

If the inputted component horizontal / vertical sync level is smaller than the predetermined threshold value, the image display device enters the fine adjustment step for detecting the component sync signal and outputs the OSD message to the screen (S304).

If the predetermined threshold value is greater than or equal to 100 mV and less than 300 mV (S305), the threshold value is reset to a value reduced by 8 mV from a predetermined threshold value (S306). Steps S303 to S306 are repeated until the reset threshold is equal to or less than the component horizontal / vertical synchronization level.

If the input component horizontal / vertical synchronization level is less than the predetermined threshold value and the predetermined threshold value is 300 mV, the detected component horizontal / vertical synchronization level value is reset to the threshold default value (S307).

If it is determined in step S303 that the component horizontal / vertical sync level is greater than or equal to the predetermined threshold value, the component horizontal / vertical sync signal is detected and the input component video signal is processed (308).

4 is a flowchart illustrating a method for full-white implementation according to an embodiment of the present invention.

In operation S401, the threshold value of the image display apparatus is automatically adjusted according to the level of the input component signal in the method shown in FIG. 3 to detect the component synchronous signal.

The color signal size of the input component video signal is detected (S402). At this time, the color signal size of the component video signal can be transmitted as field information.

If the detected color signal size is larger than the inputted component synchronizing signal ratio, the largest color signal of the detected component image is set to a full white level (S403). Here, the synchronous signal ratio is a ratio between the black level and the black level to the white level at the synchronization level. Generally, when the sync level is equal to or higher than the reference level at the sync signal ratio of 3 to 7, the output gain is attenuated, which makes it difficult to implement full-white. Accordingly, the full color component of the detected component image is set to a full white level, and the input component video signal is processed to implement full white (S404).

The terminology used in the present invention is defined in consideration of the function of the present invention. It may vary depending on the intention or custom of the technician working in the field, .

The present invention is not limited to the above-described embodiments and various changes and modifications may be made by those skilled in the art, which is included in the spirit and scope of the present invention as defined in the appended claims.

Description of the Related Art [0002]

11. Component input terminal 12. Sync level detector

13. Threshold setting section 14. Control section

15. A / D conversion section 16. Scaler

17. Display unit

Claims

Receiving a component video signal through an input terminal;

Separating a synchronizing signal from the input component video signal;

Comparing the level of the separated sync signal with a preset threshold value;

Detecting a synchronization signal from the input component video signal by automatically adjusting the predetermined threshold value according to the level of the separated synchronization signal;

Detecting a color signal size of the component video signal;

Setting a largest color signal of the detected component video signal to a white level when the detected color signal magnitude is greater than a synchronous signal level of the input component video signal; And

And implementing full-white of the input component video signal. &Lt; Desc / Clms Page number 21 >

Claim 2 has been abandoned due to the setting registration fee.

The method according to claim 1,

And performing a fine adjustment step of compensating a synchronization signal level of the component video signal when the level of the separated synchronization signal is smaller than a predetermined threshold value.

Claim 3 has been abandoned due to the setting registration fee.

The method according to claim 1,

Wherein the predetermined threshold value is in the range of 100 mV to 300 mV.

Claim 4 has been abandoned due to the setting registration fee.

3. The method of claim 2,

And resetting the threshold value to a value reduced by a predetermined unit from the predetermined threshold when the predetermined threshold value is in a range of 100 mV or more and less than 300 mV.

Claim 5 has been abandoned due to the setting registration fee.

5. The method of claim 4,

And repeating the resetting of the threshold until the reset threshold value is less than or equal to the synchronizing signal level of the component video signal.

Claim 6 has been abandoned due to the setting registration fee.

5. The method of claim 4,

And decreasing the value by 8mV at the predetermined threshold value.

Claim 7 has been abandoned due to the setting registration fee.

3. The method of claim 2,

And setting a synchronization signal level of the component video signal to a threshold default when the predetermined threshold is 300 mV.

Claim 8 has been abandoned due to the setting registration fee.

The method according to claim 1,

And detecting the synchronizing signal and processing the input component video signal when the level of the separated synchronizing signal is greater than or equal to a preset threshold value.

delete

Claim 10 has been abandoned due to the setting registration fee.

The method according to claim 1,

Wherein a color signal level of the component video signal is measured as a color signal level.

Claim 11 has been abandoned due to the set registration fee.

The method according to claim 1,

Wherein a color signal size of the component video signal is transmitted as field information.

A component input terminal for receiving a component video signal from the outside;

A sync level detector for detecting a sync signal by separating a sync signal from the input component video signal and comparing the sync signal level of the separated component video signal with a preset threshold value;

A threshold value setting unit for setting the threshold value to a predetermined reference value according to the level of the separated sync signal; And

And a scaler for detecting the sync signal and processing the input component video signal when the level of the separated sync signal is greater than or equal to a preset threshold value,

The scaler comprising:

Wherein when the size of the color signal is larger than the synchronizing signal level of the component video signal, a maximum color signal of the detected component video signal is set to a white level, A video display device for realizing full white of a component video signal.

13. The method of claim 12,

And performing a fine adjustment step of compensating a synchronization signal level of the component video signal when the level of the separated sync signal is smaller than a preset threshold value.

13. The method of claim 12,

Wherein the predetermined threshold value is in the range of 100 mV to 300 mV.

13. The method of claim 12,

Wherein the threshold value setting unit resets the threshold value to a value reduced by a predetermined unit from the predetermined threshold when the predetermined threshold value is in a range of 100 mV or more and less than 300 mV.

16. The method of claim 15,

Wherein the threshold value setting unit repeats the threshold reset until the reset threshold value becomes smaller than or equal to a synchronization signal level of the component video signal.

13. The method of claim 12,

Wherein the threshold value setting unit sets a predetermined reference value reduced by 8 mV at the predetermined threshold value.

13. The method of claim 12,

Wherein the threshold setting unit sets the synchronization signal level of the component video signal to a threshold default when the preset threshold value is 300 mV.

delete

13. The method of claim 12,

Wherein the color signal size of the component video signal is transmitted as field information.