KR100845866B1 - Method for adjustment component signal and Image display apparatus thereof - Google Patents

Abstract

The present invention relates to a component signal adjusting method and a video display apparatus thereof so that a low gray level difference does not occur. The present invention receives component (Y, Pb, Pr) signals, detects the black level of the received component signal, adjusts the offset of the black level, and stores the offset of the adjusted black level. . When the Y signal is the initial signal section, the black level is performed. At this time, the values of the Pb and Pr signals of the initial signal section are read and the offset of the black level is adjusted so that the value is zero. The initial signal section is; It is a VBI (Vertical Blanking Interval) section before the sync signal of the received component signal is received. Therefore, even if the display device detects the black level of the Y Pb Pr signal generator of a signal generator such as a DVD player and adjusts the offset, the Y Pb Pr signal generator of a signal generator such as any DVD player is connected. It is possible to maintain an optimal state without a difference in color by preventing a difference in color of low gradation.

Low gradation, color, component, picture, display, Y, Pb, Pr, black level, offset

Description

Method for adjusting component signal and image display apparatus

1 is a control flowchart illustrating a conventional component signal adjusting method.

Figure 2 is a block diagram showing a component signal adjustment image display apparatus according to the present invention.

3 is a block diagram illustrating FIG. 2 in more detail.

4 and 5 are graphs showing component signals according to the present invention.

6 is a control flowchart illustrating a component signal adjusting method according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: component signal generator 200: ADC unit

210: signal detector 220: level adjuster

230: data storage unit 300: signal processing unit

310: signal input unit 320: data lead unit

330: scaling unit 340: image processing unit

350: signal output unit 360: synchronization detection unit

370 control unit 380 data storage unit

400: display unit

The present invention relates to a video display device, and more particularly, to a component signal adjusting method and a video display device thereof so that a low color tone difference does not occur.

In general, an image generating apparatus refers to a device such as a set-top box, a DVD, a VCR, and a VTR that receives or reproduces an image signal and outputs the image signal to an external device, and the image display apparatus uses a video signal output from the image generator. Refers to a TV receiver or monitor that displays information on a video screen.

A typical image display apparatus includes a CRT (cathod ray tube), which uses a general monitor or TV CRT. Recently, various kinds of video display devices such as LCD (liquid crystal display), TFT-LCD (thin liquid crystal display), PDP (plasma display), flexible display, and head mounted display (HMD) have been developed.

Meanwhile, a component signal is typically used as an image signal transmitted and received between the image generating apparatus and the image display apparatus.

The component signal is a color image signal used for a business video device, and the like, and a luminance signal representing brightness from signals of three colors of RGB (red, green, blue) in accordance with human color senses responding to light wavelengths. (Y signal) is synthesized, and RGB color information is converted into a Y signal and two color difference signals RY / BY to express. Since composite color signals used in general video equipment and color television combine color signals (C signals) with a part of luminance signals, it is necessary to separate and synthesize Y signals and C signals during recording and playback. Since the signals of the Y signal, the color difference signal RY, and BY are separately transmitted to three channels, deterioration of image quality does not occur well. By transmitting the Y signal over a wide band, color information can be efficiently transmitted in the form of a color difference signal.

In the case of the current component signal, even if the product is adjusted with the standard signal during production, the difference in the color tone of low gradation occurs due to the black level deviation between signal devices such as a DVD player.

1 is a control flowchart illustrating a conventional component signal adjusting method.

As shown, the conventional component signal adjustment method has a standard signal when producing a display device, for example, ADC (Analog Digital Converter) adjustment with one or two representative formats of 480i, 480P, 720P, and 1080i. The same adjustment value is applied to other formats not adjusted (S101 to S103).

However, such a conventional component signal adjusting method produces a standard signal when producing a display device, but the devices possessed by the consumer do not exactly match the standard signals applied when the display device is produced. Since different colors are expressed and the same adjustment value is used because only the representative format is used without adjusting in all formats of the component, there is a problem that a difference in color of low gradation may occur due to the black level deviation between signal devices. There was this.

Accordingly, the present invention is to solve the above-mentioned general problems, when the display device receives a component signal, by detecting the black level of the received signal to adjust the offset (Offset) does not cause a difference in color It is an object of the present invention to provide a component signal adjusting method and a video display device thereof.

Component signal adjustment method according to the present invention for achieving the above object comprises the steps of receiving a component (Y, Pb, Pr) signal; Detecting a black level of the received component signal; Adjusting an offset of the black level; Storing the adjusted black level offset.

Detecting the black level comprises: This is performed when the Y signal is an initial signal section. Adjusting the offset of the black level; The values of the Pb and Pr signals in the initial signal section are read, and the offset is adjusted so that the value is zero. The initial signal section is; It is a VBI (Vertical Blanking Interval) section before the sync signal of the received component signal is received.

In addition, the component signal adjustment image display apparatus according to the present invention, an ADC unit for receiving the component (Y, Pb, Pr) signal, and detects the black level of the received component signal; A controller for adjusting an offset of the black level detected by the ADC unit; And a data storage for storing the black level offset adjusted by the controller.

The ADC unit; The black level is detected when the Y signal is an initial signal section. The control unit; The value of the Pb and Pr signals in the initial signal section is read, and the offset of the black level is adjusted so that the value is zero. The initial signal section is; It is a VBI (Vertical Blanking Interval) section before the sync signal of the received component signal is received.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram illustrating a component signal adjustment image display apparatus according to an exemplary embodiment of the present invention, and FIG. 3 is a block diagram illustrating FIG. 2 in more detail.

As shown in the present invention, the component signal generator 100, the ADC unit 200, the signal detector 210, the level adjuster 220, the data storage unit 230, the signal processor 300, the signal input unit ( 310, the data lead unit 320, the scaling unit 330, the image processor 340, the signal output unit 350, the synchronization detector 360, the controller 370, the data storage unit 380, and the display unit ( 400).

The component signal generator 100 refers to a device that outputs component (Y, Pb, Pr) signals, among other general image generators. Accordingly, all set top boxes, DVDs, VCRs and VTRs that output component signals can be applied.

The ADC unit 200 receives the component (Y, Pb, Pr) signals output from the component signal generator 100 and detects a black level of the received component signal.

To this end, the ADC unit 200 includes a plurality of signal detectors 210 for receiving respective component (Y, Pb, and Pr) signals, a level controller 220, and a data storage unit for storing final adjustment values of the ADC ( 230).

The controller 370 adjusts the offset of the black level detected by the ADC 200. The controller 370 may be configured with a conventional CPU, MPU, microcomputer, etc. having numerical calculation, comparison, and determination functions.

The data storage unit 380 stores the black level offset adjusted by the controller 370. As the data storage unit 380, a conventional memory chip such as a RAM or a ROM is preferably used, and a hard disk (HDD) or an optical disk capable of recording / reproducing may be used.

The ADC unit 200 detects a black level when the Y signal is an initial signal section, and the control unit 370 reads the values of the Pb and Pr signals in the initial signal section, and blacks the value so that the value is zero. Adjust the level offset.

At this time, the initial signal section; Preferably, the VBI (Vertical Blanking Interval) period before the sync signal of the received component signal is input.

In addition, the signal processor 300 processes the input component (Y, Pb, Pr) signals and provides a predetermined image that may be displayed on the display 400. To this end, the signal processor 300 includes a conventional signal input unit 310, a data lead unit 320, a scaling unit 330, an image processor 340, a signal output unit 350, and a synchronization detector 360. do.

4 and 5 are graphs showing component signals according to the present invention.

As shown, when the Y signal is the initial signal section, the black level is detected, the values of the Pb and Pr signals in the initial signal section are read, and the offset of the black level is adjusted so that the value is zero. The initial signal section is; Preferably, the VBI (Vertical Blanking Interval) period before the sync signal of the received component signal is input.

In the VBI section, a TV screen sent from a broadcasting station is composed of 30 screens (frames) per second, and there is an empty space in which no data is loaded between the screens. This is called VBI, or vertical return time.

Therefore, this process may be performed when the component signal is applied in the no signal state or when the format of the signal is changed, thereby maintaining the optimum offset value regardless of which Y Pb Pr signal generating device is connected.

6 is a control flowchart illustrating a component signal adjusting method according to the present invention.

As shown, receiving component (Y, Pb, Pr) signals; Detecting a black level of the received component signal (S201 to S203); Adjusting an offset of the black level (S204 to S205); And storing (S206) the offset of the adjusted black level. Detecting the black level (S201 to S203); This is performed when the Y signal is an initial signal section. Adjusting the offset of the black level (S204 ~ S205); The value of the Pb and Pr signals in the initial signal section is read and the offset is adjusted so that the value is zero. The initial signal section is; It is a VBI (Vertical Blanking Interval) section before the sync signal of the received component signal is received.

Referring to the operation of the present invention configured in this way in more detail as follows.

First, in a state in which the component signal generator 100 is connected to the image display apparatus of the present invention, the ADC unit 200 receives component (Y, Pb, Pr) signals output from the component signal generator 100. Detects a black level of the received component signal.

At this time, the ADC unit 200 checks whether the Y signal is an initial signal section, that is, a VBI section, and detects a black level in the case of the VBI section (S201 to S202).

To this end, the plurality of signal detectors 210 of the ADC unit 200 receive the respective component (Y, Pb, Pr) signals, and the level adjuster 220 is the ADC of the component (Y, Pb, Pr) signals. Adjust the level, the data storage unit 230 stores the final adjustment value of the ADC.

Here, the initial signal section is; It is a VBI (Vertical Blanking Interval) section before the sync signal of the received component signal is received.

Thereafter, the controller 370 reads the digital values of the Pb and Pr signals in the initial signal section and determines whether the values are 0 (S203 to S204).

Therefore, if the digital value of Pb Pr is not 0, the offset of the black level is adjusted so that the offset value of the ADC 200 is 0 (S205).

Meanwhile, when the digital value of Pb Pr is 0, the data storage unit 380 stores the black level offset adjusted by the controller 370 (S206).

Thereafter, the signal processor 300 processes the input component (Y, Pb, Pr) signals and provides a predetermined image to be displayed on the display 400.

Therefore, as shown in the circled portions of FIGS. 4 and 5, since the Pb Pr signal includes a signal with and without a sync, the digital value of the Pb Pr signal in the VBI section before the Y signal comes in is synchronized. It is desirable to adjust the offset value in the ADC section to be zero.

In this way, the display device detects the black levels of the Y, Pb, and Pr signals of a signal generator such as a DVD player, and adjusts the offset, so that a difference in color of low gradation may occur even if a signal generator such as a DVD player is connected. It can be prevented from occurring and maintains an optimal state without any difference in color. In addition, since the offset value is adjusted to be adaptive for each Y, Pb, and Pr signal of the signal generator, the ADC offset adjustment in the manufacturing process can be reduced, thereby improving productivity.

The present invention described above can be applied not only to flat panel display devices such as PDPs and LCDs, but also to projection TVs, general TVs, monitors, and other video devices, and can be equally applied to analog TVs, digital TVs, and satellite TVs. In addition, it can of course be applied to all NTSC, PAL, SECAM method.

Although the above has been illustrated and described with respect to the preferred embodiments of the present invention, the present invention is not limited to the above-described embodiments, and the present invention without departing from the gist of the present invention claimed in the claims is common in the art to which the present invention pertains. Anyone skilled in the art can, of course, make various changes and make such changes as fall within the stated claims.

As described above, according to the present invention, the display device detects the black level of the Y, Pb, and Pr signals output from the signal generator such as a DVD player, and adjusts the offset, thereby generating a signal generator such as a DVD player. Even if the Y Pb Pr signal generator is connected, it is possible to maintain the optimal state without the difference in color by preventing the difference in color of the low gradation.

In addition, since the offset value is adjusted to adapt to the Y, Pb, Pr signal of the signal generator, it is possible to reduce the ADC offset adjustment of the manufacturing process, thereby improving productivity.

Claims (8)

Receiving component (Y, Pb, Pr) signals; Detecting a black level of the received component signal; Adjusting an offset of the black level; Storing the adjusted black level offset. The method of claim 1, Detecting the black level comprises: Component signal adjusting method characterized in that performed in the initial section of the Y signal. The method of claim 1, Adjusting the offset of the black level; And reading the values of the Pb and Pr signals in the initial section of the Y signal and adjusting the offset so that the value is zero. The method according to claim 2 or 3, The initial period of the Y signal is; And a VBI (Vertical Blanking Interval) section before the sync signal of the received component signal is received. An ADC unit for receiving a component (Y, Pb, Pr) signal and detecting a black level of the received component signal; A controller for adjusting an offset of the black level detected by the ADC unit; And a data storage unit for storing the black level offset adjusted by the controller. The method of claim 5, The ADC unit; And detecting the black level in the initial section of the Y signal. The method of claim 5, The control unit; And reading the values of the Pb and Pr signals in the initial section of the Y signal, and adjusting an offset of the black level so that the value is zero. The method according to claim 6 or 7, The initial period of the Y signal is; And a vertical blanking interval (VBI) section before the sync signal of the received component signal is input.

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