KR20040009885A - Video displaying device capable of adjusting picture for DTV signal and a method of adjusting picture thereof - Google Patents

Abstract

PURPOSE: A video display system capable of controlling picture quality of a digital broadcasting signal and a picture quality control method of the video display system are provided to obtain the optimum picture quality for digital broadcasting signals as well as analog broadcasting signals. CONSTITUTION: A video display system includes an input unit(300) for receiving a control command for controlling a luminance signal level and a color difference signal level of a digital broadcasting signal, and a level controller(230) that controls the luminance signal level and color difference signal level of the digital broadcasting signal. The video display system further includes a controller(400) that controls the level controller to control the luminance signal level and color difference signal level in response to the control command.

Description

Video display device capable of adjusting the quality of a digital broadcast signal and a method for adjusting the quality of a digital broadcast signal

The present invention relates to an image display apparatus capable of receiving a digital broadcast signal, and more particularly, to an image display apparatus capable of adjusting brightness and color difference signals (Y, Pb, Pr) of a digital broadcast signal in an optimal state. .

Recently, digital broadcasting has been spotlighted for better image quality, sound quality, and hundreds of channel capacities. In order to use such a digital broadcast, a receiver called a digital set top box (STB) is required to receive a broadcast. In order to receive a digital broadcast, an STB is connected to an existing TV set, or an STB inside the TV. Receive digital broadcasting in the form of a built-in.

As described above, in digital television (hereinafter, referred to as 'DTV') that can receive digital broadcasting, adjustment of brightness and color difference signal of the video signal can be adjusted only for analog broadcasting signal, and digital broadcasting signal (hereinafter referred to as 'DTV signal'). It is not possible to adjust the luminance and color difference signals of the DTV signal generated by the deviation of the device such as the STB for receiving.

For example, FIG. 1 schematically illustrates a block in which luminance, color difference signals (Y, Pr, and Pb) are processed to explain a color density and a color adjustment function in a conventional image display apparatus for receiving digital broadcasting. It is also.

The video display device includes a tuner 11, an intermediate frequency amplifier 12, an image signal processor 13, an RGB matrix unit 14, an image output unit 15, a selector 20, an input unit 30, It has the control part 40 and the display part 50.

The tuner 11 tunes the analog TV signal received through the antenna (not shown) to the frequency of the channel selected by the user and outputs the same to the intermediate frequency amplifier 12. The intermediate frequency amplifier 12 outputs the tuner 11. The intermediate frequency of the tuned broadcast signal is amplified to a size suitable for signal processing. The video signal processor 13 processes the broadcast signal of the intermediate frequency amplified by the intermediate frequency amplifier 12. That is, the video signal processor 13 separates the broadcast signal into luminance and color difference signals, and processes the separated luminance signal and color difference signals, respectively, and then applies them to the RGB matrix unit 14. The RGB matrix unit 14 combines the color difference signals processed by the image signal processing unit 13 into a matrix, combines them with luminance signals, and outputs them to the image output unit 15. The image output unit 15 processes the luminance signal and the color difference signal (Y, Cr, Cb) combined by the RGB matrix unit 14 into predetermined signals that can be displayed on the display unit 50.

On the other hand, the external input signal, for example, the DTV signal (480p, 720p, 1080i, etc.), DVDP, VCR, PC, etc., the external input signal is input through a set-top box (not shown) is processed a predetermined video signal (R) , G, B or Y, Pb, Pr). The selection unit 20 selects a predetermined video signal in response to the user's selection command with respect to the external input signal. The image signal selected by the selector 20 is input to the RGB matrix unit 14 and output to the display unit 50 through the image output unit 15. At this time, the RGB matrix unit 14 is used only as a switching function for connecting the predetermined image signal R, G, B, or Y, Pb, Pr output from the selector 20 to the display unit 50. do.

As described above, in the conventional image display apparatus, when a user inputs an adjustment command through the input unit 30 to adjust color density and color, the control unit 40 responds to the input adjustment command in response to the RGB matrix unit 14 and the image. By controlling the output unit 15, adjustment is made to have an optimal color depth and image quality of color. However, the picture quality adjustment function is applied only to analog TV signals, and not to DTV signals (480p, 720p, 1080i, etc.) output from a set top box (not shown).

That is, the luminance and color difference signals Y, Pb, and Pr of the DTV signals 480p, 720p, and 1080i output from the set top box (not shown) are output at a predetermined level and input to the RGB matrix unit 14. The RGB matrix unit 15 performs only a switching function for outputting the DTV signal to the display unit 50 so that the color density and color according to the luminance and color difference signals Y, Pb, and Pr are not adjusted.

By the way, in general, a set-top box (not shown) may deteriorate the image quality due to a decrease in the color density of the original input signal and the reproducibility of the color due to device-specific variations. In such a case, in the image display apparatus capable of adjusting the image quality only with respect to the conventional analog TV signal, the image quality deterioration occurs by outputting the DTV signal (480p, 720p, 1080i, etc.) to the display unit 50 without any level adjustment.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide an image display apparatus having an image quality adjusting function for not only an analog TV signal but also a DTV signal.

1 is a schematic block diagram of a conventional image display apparatus;

2 is a schematic block diagram of an image display apparatus according to the present invention; and

3 is a flowchart illustrating a method of adjusting color density and color of a DTV signal by the image display apparatus of FIG. 2.

Explanation of symbols on the main parts of the drawings

110: tuner 120: intermediate frequency amplifier

130: image signal processing unit 140: RGB matrix unit

150: image output unit 210: selection unit

230: level adjustment unit 300: input unit

400: control unit 500: display unit

An object of the present invention is to provide an image display apparatus for signal-processing and displaying a digital broadcast signal according to the present invention, comprising: an input unit for inputting an adjustment command for adjusting a level of a luminance signal and a color difference signal of a digital broadcast signal; And a control unit for controlling the level adjusting unit to adjust the level of the luminance signal and the color difference signal of the digital broadcast signal in response to the adjustment command.

In addition, there is an image output unit for signal processing for outputting an image signal having a luminance signal and a chrominance signal level-adjusted by the level adjusting unit, and a display unit for outputting the signal processed image signal to an external device. The video output unit is controlled to output a video signal as a predetermined video signal.

Preferably, the level adjusting unit sets one of the luminance signal and the color difference signal to a fixed level, adjusts the level of the other signals in response to the adjusting command, and sets another signal by the adjusting command input through the input unit. The level of is adjusted.

On the other hand, according to the present invention, the image quality adjusting method for the digital broadcast signal of the video display device for signal processing and displaying the digital broadcast signal, inputs an adjustment command for adjusting the level of the luminance signal and the color difference signal of the digital broadcast signal. Doing; Adjusting levels of luminance signals and chrominance signals of the digital broadcasting signal in response to the adjustment command; And outputting an image signal having a luminance signal and a color difference signal of which level is adjusted.

In the level adjustment step, it is preferable to set one of the luminance signal and the color difference signal to a fixed level, and adjust the level of another signal in response to the adjustment command input in the input step.

Therefore, the level of the luminance signal and the color difference signal (Y, Pb, Pr) of the digital broadcast signal can be adjusted, so that not only the analog broadcast signal but also the optimum picture quality can be obtained for the digital broadcast signal.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

2 is a schematic block diagram of an image display apparatus having a color density and color adjustment function for a DTV signal according to an exemplary embodiment of the present invention.

The image display apparatus includes a tuner 110, an intermediate frequency amplifier 120, an image signal processor 130, an RGB matrix unit 140, an image output unit 150, a selector 210, and a level adjuster 230. And an input unit 300, a control unit 400, and a display unit 500.

The tuner 110 tunes the analog TV signal received through the antenna (not shown) to the frequency of the channel selected by the user and outputs the same to the intermediate frequency amplifier 120. The intermediate frequency amplifier 120 amplifies the intermediate frequency of the broadcast signal tuned by the tuner 110 to a size suitable for signal processing. The image signal processor 130 processes the broadcast signal of the intermediate frequency amplified by the intermediate frequency amplifier 120. That is, the image signal processor 130 separates the broadcast signal into luminance and color difference signals, and processes the separated luminance signal and color difference signals, respectively, and applies them to the RGB matrix unit 140. The RGB matrix unit 140 combines the color difference signals processed by the image signal processor 130 in a matrix, combines them with luminance signals, and outputs them to the image output unit 150. The image output unit 150 processes the luminance signal and the color difference signals Y, Cb, and Cr combined by the RGB matrix unit 140 into predetermined signals that can be displayed on the display unit 500. The display unit 500 is a CRT, LCD, PDP, or the like as a display element.

On the other hand, the external input signal is, for example, the DTV signal (480p, 720p, 1080i, etc.), DVDP, VCR, PC, etc., the external input signal is input through a set-top box (not shown) is processed a predetermined video signal (R) , G, B or Y, Pb, Pr).

The input unit 300 is a remote control having an operation panel and an operation button provided for a user to input an operation command to the image display device. The input unit 300 selects a predetermined external input signal from the plurality of external input signals.

The selector 210 selects an external input signal selected through the input unit 300.

The level adjusting unit 230 adjusts the levels of luminance and color difference signals Y, Pb, and Pr in response to a user's adjustment command with respect to the external input signal selected by the selecting unit 210. For example, the level adjustment of the level adjusting unit 230 sets the level of one of the luminance and color difference signals (Y, Pb, and Pr) to be fixed, and the level of the other two signals can be adjusted by the user by up / down converting. do. The luminance and color difference signals Y, Pb, and Pr whose levels are adjusted are input to the RGB matrix unit 140 and output to the display unit 500 through the image output unit 150.

Hereinafter, a method of adjusting color density and color for a DTV signal according to a preferred embodiment will be described in detail with reference to the flowchart of FIG. 3.

Referring to the flowchart, any one of a DTV signal (480p, 720p, 1080i, etc.), a DVDP, a VCR, and a PC, from which an input signal selected by the user through the input unit 300 is output from a set-top box (not shown), for example, When the component signal 480p is selected (S100), the selector 210 selects and outputs the component signal 480p (S200). Thereafter, the component signal 480p is output to the display unit 500 through the RGB matrix unit 140 and the image output unit 150 (S300). At this time, when the image quality of the component signal 480p output from the display unit 500 is deteriorated, the user converts up / down using a predetermined adjustment button of the input unit 300. That is, the user controls the color density and color of the desired image quality by adjusting the luminance of the component signal 480p and the level of the color difference signals Y, Pb, and Pr. Here, the level adjustment of the luminance and chrominance signals (Y, Pb, Pr) applies a fixed level value to any one of the luminance and chrominance signals (Y, Pb, Pr), and the user of the remaining two signals. The level is adjusted by the adjustment command. Therefore, the luminance and color difference signals Y, Pb, and Pr are set to predetermined levels by the user's adjustment command. By controlling the level adjusting unit 230, the control unit 400 adjusts the level adjusting unit 230 to the level of the luminance and color difference signals Y, Pb, and Pr set by the user (S500).

As such, the luminance and color difference signals Y, Pb, and Pr of the component signal 480p adjusted to the level set by the user are output to the display unit 500 through the RGB matrix unit 140 and the image output unit 150. It becomes (S300). Therefore, the brightness of the component signal 480p and the level of the color difference signals Y, Pb, and Pr are adjusted to obtain an optimum picture quality.

On the other hand, although not shown in the flowchart, the adjustment of the luminance and color difference signals Y, Cb, Cr relative to the analog TV signal is as follows. When the input signal selected by the user through the input unit 300 is an analog TV signal received from the tuner 110, color density and color are adjusted as in the conventional video display device.

That is, the analog TV signal separates the luminance signal and the chrominance signal from the image signal processor 130, and outputs the chrominance signal and the luminance signals Y, Cb, and Cr from which the synchronization signal is separated among the chrominance signals. The RGB matrix unit 140 combines the color difference signals processed by the image signal processor 130 in a matrix, combines them with luminance signals, and outputs them to the image output unit 150. The image output unit 150 processes the luminance signal and the color difference signal (Y, Cb, Cr) combined by the RGB matrix unit 140 into predetermined signals that can be displayed on the display unit 500, and displays them on the display unit 500. .

As such, when the user adjusts the color density and the color of the analog TV signal displayed on the display unit 500, the user may up / down the predetermined color density and color through a predetermined adjustment button provided in the input unit 300. Convert to adjust. In this way, the control unit 400 controls the RGB matrix unit 140 and the image output unit 150 in response to a color density and a color adjustment command input through the input unit 300. Therefore, the image quality of the image signal output to the display unit 500 is output corresponding to the color density and color adjusted by the user.

In this way, not only the analog TV signal but also the adjustment function of the color density and color of the DTV signal can be adjusted by the user so that the user can watch an image having a picture quality that suits the user's taste.

According to the present invention, in order to solve the problem of deterioration of the image quality of the DTV signal due to the deviation of the device such as a set-top box, which is a digital broadcasting receiver, the user may adjust the luminance and the color difference signal (Y, Pb, Pr) level of the DTV signal. do. As a result, the luminance of the DTV signal and the levels of the color difference signals Y, Pb, and Pr can be adjusted, so that an optimum image quality can be obtained not only for the analog TV signal but also for the DTV signal.

While the above has been shown and described with respect to preferred embodiments of the present invention, the invention is not limited to the specific embodiments described above, it is usually in the art to which the invention belongs without departing from the spirit of the invention claimed in the claims. Anyone skilled in the art can make various modifications, as well as such modifications are within the scope of the claims.

Claims (6)

A video display device for displaying a digital broadcast signal by processing the signal, An input unit for inputting an adjustment command for adjusting levels of the luminance signal and the color difference signal of the digital broadcast signal; A level adjusting unit for adjusting levels of the luminance signal and the color difference signal of the digital broadcast signal; And And a control unit which controls the level adjusting unit to adjust levels of the luminance signal and the color difference signal of the digital broadcast signal in response to the adjustment command. The method of claim 1, An image output unit for signal processing to output an image signal having the luminance signal and the chrominance signal level adjusted by the level adjusting unit; And a display unit configured to output the signal processed image signal to the outside. And the controller controls the image output unit to output the level-adjusted image signal to the display unit as a predetermined image signal. The method of claim 1, The level adjustment unit, And setting one of the luminance signal and the chrominance signal to a fixed level, and adjusting the level of the other signals in response to the adjustment command. The method of claim 3, And the adjustment command up / down converts the level of the other signal. In the image quality adjustment method for the digital broadcast signal of the video display device for displaying the digital broadcast signal by processing the signal, Inputting an adjustment command for adjusting the level of the luminance signal and the color difference signal of the digital broadcast signal; Adjusting levels of the luminance signal and the color difference signal of the digital broadcast signal in response to the adjustment command; And And outputting a video signal having the level-adjusted luminance signal and the color difference signal. The method of claim 5, The level adjustment step, And setting one of the luminance signal and the chrominance signal to a fixed level, and adjusting the level of the other signals in response to the adjustment command input in the input step. .