KR100759224B1 - Method for displaying video of display apparatus - Google Patents

Abstract

The present invention relates to an image display method of a display device, which is downscaled in order to prevent image quality deterioration due to downscaling when a high resolution computer image is displayed on a low resolution panel of a display device for displaying a broadcast signal of a low resolution. By alternately displaying the frame by frame interlacing method, a clearer picture quality can be obtained.

High resolution, digital, interlaced, frame, downscaling, low resolution, panel, LCD, PDP

Description

Display method of image on display device {METHOD FOR DISPLAYING VIDEO OF DISPLAY APPARATUS}

1 is a block diagram schematically illustrating a general display device.

2 is a flowchart illustrating an image display method of a display apparatus according to the present invention.

   -Explanation of symbols for the main parts of the drawings-

10: video decoder 20: control unit

30: scaler 40: A / D converter

50: connector 60: panel

70: computer

The present invention relates to an image display method of a display device, and more particularly, to prevent deterioration of image quality due to downscaling when a high resolution computer image is displayed on a low resolution panel of a display device for displaying a low resolution broadcast signal. The present invention relates to an image display method of a display device, which can improve image quality by alternately displaying down-scaled images by frame-based interlacing.

The digitalization of information spread from the computer industry to the information and communication industry has recently spread to television broadcast signals, and the importance of display devices increases with the development and spread of information processing systems. It's getting mad.

CRT (Cathode Ray Tube), which has been used most often as a display device, has various problems such as large size, high operating voltage, and distortion of display. Recently, research and development of various flat panel display devices having a matrix structure have been actively progressed because they are not suitable.

In other words, the flat panel display device has a matrix structure, which displays a stable image free from display distortion and color bleeding, and has a flat structure, is thin, and has a low operating voltage. It can be applied to the field.

In addition, the display device is compatible with data through a serial interface implemented through IEEE 1394 interface technology such as digital broadcasting, digital multi-function disc (DVD) player, digital camcorder, digital VCR, etc., which processes digital signals as well as computers. Do.

1 is a block diagram schematically illustrating a general display device.

As shown here, a connector 50 coupled to a graphics card (not shown) of the computer 70 receives an analog RGB video signal, and receives an analog RGB video signal from the connector 50 to receive a digital RGB video signal. An A / D converter 40 to generate, a scaler 30 for receiving a digital RGB video signal from the A / D converter 40 and processing the digital RGB video signal in a predetermined display form, and an AV (CVBS / S A video decoder 10 for converting a signal transmitted by a VHS) or a TV tuner (not shown) into a digital RGB image signal for processing by the scaler 30, and digitally processed through the scaler 30. A panel 60 of an LCD or PDP displaying an RGB video signal, and a control unit 20 for controlling the operation of the scaler 30.

Therefore, when an analog RGB video signal is received from the graphics card of the computer 70 through the D-SUB connector (not shown), the A / D converter 40 receives the analog RGB video signal and converts the digital RGB video signal into a digital RGB video signal. When output to the unit 30, the scaler unit 30 receives the digital RGB image signal from the A / D converter 40, processes the digital RGB image signal in a predetermined display form, and displays the digital RGB image signal on the panel 60.

In addition, when watching a television, the video signal inputted through the video decoder 10 through the AV (CVBS / S-VHS) or the TV tuner is converted into a digital RGB video signal so that the scaler 30 can process the video signal. When output, the scaler 30 processes the digital RGB image signal in a predetermined display form and displays it on the panel 60.

However, in general, the resolution of the panel is limited to about 640 × 480, 720 × 480, 800 × 600, 1024 × 768 depending on the resolution of the television broadcast, but the resolution of the computer is output up to 1280 × 1024.

Therefore, when a high resolution image of 1280 × 1024 is to be displayed on a low resolution panel of 800 × 600, the scaler 30 displays the high resolution image of 1280 × 1024 downscaled to match the resolution of the panel.

For this downscaling, first, low pass filtering is performed on the input signal of the computer to remove fine details first, and then downscaling is performed by using Nearest, Bilinear, and Bicubic interpolation methods. There is a problem in that the quality deterioration in which the screen is crushed or duplicated is inevitable because a large amount of information has to be represented in a small space only by the difference of the average value.

The present invention has been made to solve the above problems, and an object of the present invention is to reduce image quality due to downscaling when a high resolution computer image is displayed on a low resolution panel of a display device for displaying a low resolution broadcast signal. The present invention provides a method of displaying an image of a display device to improve image quality by alternately displaying down-scaled images in a frame-by-frame interlacing scheme.

In order to achieve the above object, the present invention provides a video display method of a display apparatus which performs downscaling to display a high resolution image on a low resolution panel, wherein the EVEN line and the ODD line are framed after downscaling the high resolution image. Alternately to display in an interlaced manner.

delete

In the present invention, after downscaling, high pass filtering is performed.

In the present invention, the high resolution image is characterized in that the image frequency is 70Hz or more.

According to the present invention, when the high resolution image inputted from a computer or the like is displayed on a display device having a low resolution panel, down scaling of the high resolution image is performed, and then only the EVEN line is displayed in the current frame in a frame-by-frame interlacing method, By displaying only the ODD line alternately displaying the EVEN line and the ODD line in units of frames, it is possible to obtain a clearer picture quality by reducing overlapping images generated by displaying a large amount of information in a small space.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings, and the same parts as in the prior art use the same reference numerals and names. In addition, the present embodiment is not intended to limit the scope of the present invention, but is presented by way of example only and those skilled in the art will be capable of many modifications within the technical spirit of the present invention.

2 is a flowchart illustrating an image display method of a display apparatus according to the present invention.

First, it is determined whether the input image is a higher resolution image than the panel 60 of the display apparatus, and when the image is the same resolution, the input image is displayed by a general method.

However, if the input image is higher resolution than the resolution of the panel 60, it is processed by the method according to the present invention (S10).

That is, when the input image is 1280 × 1024 high resolution and the panel 60 is 800 × 600 resolution, low frequency filtering is performed on the input image to remove high frequency components that cannot be displayed at low resolution such as a fine image. (S20).

After the high frequency component is removed, downscaling is performed using Nearest, Bilinear, or Bicubic interpolation (S30).

Then, high pass filtering (HPF) is performed on the down-scaled image to remove the image due to low frequency components such as a crushed screen or an overlapped screen, thereby making it clear (S40).

The EVEN line and the ODD line are alternately displayed for each converted image for each frame (S50 to S75).

That is, if the flag is set to "1" and the EVEN line is displayed in this frame and the flag is changed to '0' (S60) (S65), the ODD line is displayed because the flag is '0' in the next frame. If the flag is changed back to '1' (S70) and S75, the EVEN line and the ODD line may be displayed alternately by frame.

In this case, since the downscaled image is displayed in a frame-by-frame interlacing method, when the frequency of the input image is low, flickering occurs, the image is preferably 70 Hz or higher.

Therefore, it is possible to obtain a clearer picture quality by reducing redundant images generated by displaying a large amount of information in a small space.

As described above, in the present invention, when a high resolution computer image is to be displayed on a low resolution panel of a display device for displaying a broadcast signal of a low resolution, a downscaled image is frame-by-frame interlaced method to prevent image quality degradation due to downscaling. By alternately displaying with, there is an advantage that a clearer picture quality can be obtained.

Claims (4)

In the image display method of the display device for performing a down-scaling to display a high resolution image on a low resolution panel, After down-scaling the high resolution image, the display method of the display device, characterized in that to display the EVEN line and the ODD line by the frame unit alternately. delete The method of claim 1, wherein the high pass filtering is performed after downscaling. The method of claim 1, wherein the high resolution image has an image frequency of 70 Hz or more.

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