KR20010002391A - Method for Converting Resolution for Full Screen Display - Google Patents

Abstract

PURPOSE: A resolution transformation method for full screen display is provided to transform resolutions using the pixel blocks of horizontal and vertical GCD(Greatest Common Divisor) size as a basic unit, thereby displaying video signals input as various video modes to be matched to a full screen of a LCD panel having various sizes. CONSTITUTION: The resolution transformation method for full screen display comprises a step calculating the first (Greatest Common Divisor)GCD between a horizontal resolution of an input video mode and a horizontal resolution of a displayer and the second GCD between a vertical resolution if the input mode and a vertical resolution of the displayer. Then, the horizontal and vertical resolutions of the input video mode are divided by the first/second GCDs to set a minimum transform block respectively divided the first minimum pixel and line group units, and the horizontal and vertical resolutions of the displayer are divided by the first/second GCDs to set a minimum screen block respectively divided the second minimum pixel and line group units. Finally, a video scaling process for matching the resolutions of the transform and screen blocks is repeatedly performed.

Description

Resolution for full screen display {Method for Converting Resolution for Full Screen Display}

The present invention relates to a resolution conversion method for a full-screen display, and more particularly, to calculate the maximum common divisor of the horizontal direction and the vertical direction between the resolution of various video modes and the size of the LCD panel to be displayed in the LCD driving system. Then, by converting the resolution using pixel blocks of the greatest common divisor in the horizontal direction and the greatest common divisor in the vertical direction as the basic unit, image signals input in various video modes can be displayed in accordance with the full screen of LCD panels of various sizes. The present invention relates to a resolution conversion method for a full screen display.

Today, with the rapid development of the highly information society, the rapid spread of the multimedia system is taking place. Therefore, the importance of the display device that plays a role of cross-linking between human and electronic devices is increasing. Liquid crystal display (LCD) is attracting attention as a high-definition display device that can replace the bulky and power-consuming CRT (Cathode Ray Tube).

LCDs, which have the advantages of light weight, thinness, high definition, and low power consumption, have increased in size and displayable resolution as electronic technologies are developed. Accordingly, the LCD is required to display the entire screen regardless of the input video mode as in the conventional multi-sync CRT (multi-sync CRT). Unlike CRTs, LCDs use digital signals, so digital image processing techniques are required for screen expansion.

Representative prior applications related to the resolution conversion method of the display device according to the prior art are Korean Patent Application No. 1997-022945, "Dual Display Device for Portable Personal Information Terminal", Korean Patent Application No. 1993-011678, "12 of Monitor" Normal display mode 15 "Full-screen display mode switching circuit", Korean Patent Application No. 1997-019423, "Automatic vertical extension circuit of wide TV (WIDE TV)", Korean Patent Application No. 1996-016520, "Extending the shot player Conversion method and device ", Korean Patent Application No. 1997-004905," screen reduction device of liquid crystal display device ", US Patent Publication No. US04816929," Dual access frame store for field or frame playback in a video disk player ", United States of America Patent Publication No. US05907640, "Functional interpolating transformation system for image processing", US Patent Publication No. US05844617, "Method and apparatus for enhancing the vertical res olution of a television signal having degraded vertical chrominance transitions ", US Patent Publication No. US05835029," Digital convergence apparatus ", US Patent Publication No. US05349385," Adaptive scan converter ", US Patent Publication No. US05299300," Interpolation processing of digital map imagery data ", US Patent Publication No. US04858026," Image display ", and the like.

1 is an exemplary diagram showing a relationship between an input video mode and a pixel group of an LCD panel, and FIG. 2 is an exemplary diagram illustrating a display form of an LCD in various video modes.

As shown in FIG. 1, the pixels of the LCD panel have a one-to-one correspondence with the resolution of the input video mode. Therefore, the LCD panel size is the maximum resolution that can be expressed.

For example, as shown in Fig. 2, when the LCD panel size is based on an SXGA (1280 × 1024) LCD panel, the input video modes are VGA (640 × 480), SVGA (800 × 600), and XGA (1024 × 768). If the LCD panel is smaller than the size of the LCD panel, the full screen cannot be displayed due to the characteristics of the LCD. Therefore, the pixel group of the LCD panel cannot be used efficiently. In addition, when the input video mode is larger than the size of the LCD panel, such as UXGA (1600 × 1200), the screen itself cannot be displayed.

As a method for compensating the drawback of the LCD display driving method, a number of techniques for extending the resolution of the input video mode to a power of 2 such as 2 times, 4 times, and up to 8 times are known. FIG. 3 illustrates a case in which the screen is enlarged 2 times and 4 times when the input video mode is VGA by applying the conventional screen enlargement method.

This magnification is easy to implement because the LCD is based on digital driving, whereas the resolution of the video mode is typical because the resolution of a typical video mode is not a power of 2 power as shown in Table 1. Not only can the entire panel not be displayed accurately, but the enlarged screen becomes larger than the size of the LCD panel. Table 1 shows the resolution of the standard video modes recommended by the Video Electronics Standards Association (VESA) and the magnification of each mode.

Video mode resolution Magnification ÷ VGA ÷ SVGA ÷ XGA ÷ SXGA ÷ UXGA VGA 640 × 480 1.00 × 1.00 0.80 × 0.80 0.625 × 0.625 0.50 × 0.47 0.40 × 0.40 SVGA 800 × 600 1.33 × 1.25 1.00 × 1.00 0.78 × 0.78 0.625 × 0.58 0.50 × 0.50 XGA 1024 × 768 1.71 × 1.60 1.28 × 1.71 1.00 × 1.00 0.80 × 0.75 0.56 × 0.64 SXGA 1280 × 1024 2.00 × 2.13 1.60 × 1.71 1.25 × 1.33 1.00 × 1.00 0.80 × 0.85 UXGA 1600 × 1200 2.50 × 2.50 2.00 × 2.00 1.56 × 1.56 1.25 × 1.17 1.00 × 1.00

In this case, in order to view the entire screen, a screen scroll function should be used, which causes a user to feel an inconvenience in operation and has a problem of poor visibility of the entire screen. In addition, since excessive magnification of the screen has a limitation on the performance of the digital interpolation filter used for magnification, even when using an advanced interpolation filter, there is a problem that the user satisfaction with the product is significantly degraded as the image quality is degraded at high magnification. .

Accordingly, the present invention has been made to solve such a problem, and in order to display the entire screen of the LCD according to LCD panels of various sizes for various video modes in the LCD driving system, various video inputs are made. After calculating the greatest common divisor (GCD) for the horizontal direction and the vertical direction between the resolution of the mode and the size of the LCD panel to be displayed, the pixel blocks having the greatest common divisor in the horizontal direction and the maximum common divisor in the vertical direction are respectively calculated. It is an object of the present invention to provide a resolution converting method for a full-screen display by displaying a video signal input in various video modes according to a full screen of various sized LCD panels by performing resolution conversion based on the basic unit.

1 is an exemplary view showing a relationship between an input video mode and a pixel group of an LCD panel;

2 is an exemplary view showing a display form of an LCD in various video modes;

3 is an exemplary diagram in which a screen is enlarged 2 times and 4 times in a case where an input video mode is VGA by applying a conventional screen magnification method.

4 is a flowchart showing a preferred embodiment of a resolution converting method for a full screen display according to the present invention;

5 is an exemplary diagram showing an example of performing a full screen display using a maximum common factor between the resolution of the input video mode and the resolution of the display device according to the present invention;

6 is an exemplary view showing that the horizontal magnification interpolation method of the present invention is applied,

7 is an exemplary view showing that the vertical magnification interpolation method of the present invention is applied.

In order to achieve the above object, the present invention calculates a first maximum common divisor which is the maximum common divisor between the horizontal resolution of the input video mode and the horizontal resolution of the display device, and the maximum common divisor between the vertical resolution of the input video mode and the vertical resolution of the display device. After calculating the second maximum common divisor, the horizontal and vertical resolutions of the input video mode are divided by the first maximum common divisor and the second maximum common divisor, respectively, the minimum divided by the first minimum pixel group and the first minimum line group. Determine a transform block, determine the minimum screen block divided by the second minimum pixel group and the second minimum line group, respectively, calculated by dividing the horizontal resolution and the vertical resolution of the display apparatus by the first maximum common factor and the second maximum common factor Zero to zoom so that the resolution of the minimum transform block matches the resolution of the minimum screen block. It is characterized by executing a scaling process by a greatest common divisor to a minimum recurring unit of a transform block for performing a full-screen display.

Hereinafter, a preferred embodiment of a resolution converting method for a full screen display according to the present invention will be described with reference to the accompanying drawings.

4 is a flowchart illustrating a preferred embodiment of a resolution converting method for a full screen display according to the present invention.

A preferred embodiment of a resolution converting method for a full screen display according to the present invention is a resolution converting method for a full screen display when a resolution of an input video mode and a resolution of a display device are different as shown in FIG. ,

Calculate a first greatest common divisor between the horizontal resolution of the input video mode and the horizontal resolution of the display device, and calculate a second greatest common divisor between the vertical resolution of the input video mode and the vertical resolution of the display device A first step (S100) to be performed;

Determine a minimum transform block divided by a first minimum pixel group and a first minimum line group, respectively, calculated by dividing the horizontal resolution and the vertical resolution of the input video mode by the first greatest common factor and the second greatest common factor; A second step of determining a minimum screen block divided in units of a second minimum pixel group and a second minimum line group, respectively, calculated by dividing the horizontal resolution and the vertical resolution of the display apparatus by the first greatest common factor and the second greatest common factor; S200); And

A third step (S300) of performing a full screen display by repeatedly performing the image scaling process of expanding / reducing the minimum transform block to match the resolution of the minimum screen block by the greatest common factor in the unit of the minimum transform block; Configured to perform.

Here, the third step (S300) may include determining whether the resolution of the display device is greater than the resolution of the input video mode (S310);

If the resolution of the display device is greater than the resolution of the input video mode, the first multiplication result value calculated by multiplying an arbitrary natural number by the pixel number of the first minimum pixel group is determined. Calculating a first scale value, which is a natural number, to be approximated within a range equal to or less than the number of pixels of the second minimum pixel group, and subtracting the first multiplication result value from the number of pixels of the second minimum pixel group by a first offset Calculating a value (S320);

A second scale value, which is a natural number, is calculated such that the second multiplication result value calculated by multiplying a line number of the first minimum line group by an arbitrary natural number is within or equal to or less than a line number of the second minimum line group. Calculating a second offset value by subtracting the second multiplication result value from the number of lines in the second minimum line group (S330); And

The first scale value and the second scale value are respectively determined as the number of pixels to be interpolated for every pixel data and the number of lines to be interpolated for every line data, and the first offset value and the second offset value are determined as the minimum value. After determining the number of pixels to be copied per transform block and the number of lines, the process of performing image magnification is repeated by the first greatest common factor and the second greatest common factor in the vertical and horizontal directions in units of the smallest transform block, respectively. Performing a screen display (S340);

A third multiplication result calculated by multiplying an inverse number of a natural number by the number of pixels of the first minimum pixel group when the resolution of the display apparatus is smaller than the resolution of the input video mode; Calculating a third scale value which is an inverse of a natural number such that a value is approximated within a range equal to or greater than the number of pixels of the second minimum pixel group, and subtracting the number of pixels of the second minimum pixel group from the third multiplication result; Calculating a third offset value by subtracting (S350);

A fourth multiplication result calculated by multiplying the number of lines in the first minimum line group by an inverse number of a natural number, and is a reciprocal of a natural number which is approximated within a range equal to or greater than the number of lines in the second minimum line group. Calculating a fourth scale value and subtracting the number of lines of the second minimum line group from the fourth multiplication result value to calculate a fourth offset value (S360); And

The third scale value and the fourth scale value are respectively determined as the number of pixels to be reduced-interpolated for every pixel data and the number of lines to be reduced-interpolated for every line data, and the third offset value and the fourth offset value are determined as the minimum value. After determining the number of pixels and lines to be deleted per transform block, the process of performing the image reduction process is repeated by the first greatest common factor and the second greatest common factor in the vertical and horizontal directions for each of the minimum transform blocks. It is configured to perform the step of performing the display (S370).

Here, the display device is preferably a liquid crystal display (LCD) panel.

Hereinafter, a process of performing a preferred embodiment of a resolution converting method for a full screen display according to the present invention will be described with reference to the accompanying drawings.

In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

5 is an exemplary diagram illustrating an example of performing a full screen display using a maximum common factor between the resolution of the input video mode and the resolution of the display apparatus according to the present invention.

First, in a first step S100, a first maximum common factor GCD _H , which is a maximum common divisor between the horizontal resolution RSL _H of the input video mode and the horizontal resolution PNL _H of the display device (here, LCD panel), is calculated. A second maximum common factor GCD _V , which is a maximum common divisor between the vertical resolution RSL _V of the input video mode and the vertical resolution PLL _V of the display device, is calculated.

Table 2 shows the maximum common factors GCD _H and GCD _V for the horizontal and vertical axes of the resolution (RSL _H × RSL _V ) and LCD panel size (PNL _H × PNL _V ) of the various video modes.

Video mode (RSL _H × RSL _V ) resolution LCD panel size (PNL _H × PNL _V ) VGA SVGA XGA SXGA UXGA VGA 640 × 480 640 × 480 160 × 120 128 × 96 640 × 32 320 × 320 SVGA 800 × 600 160 × 120 800 × 600 32 × 24 160 × 60 ^* 800 × 600 XGA 1024 × 768 128 × 96 32 × 24 1024 × 768 256 × 256 64 × 48 SXGA 1280 × 1024 640 × 32 160 × 60 ^* 256 × 256 1280 × 1024 320 × 16 UXGA 1600 × 1200 320 × 320 800 × 600 64 × 48 320 × 16 1600 × 1200

Here, '*' is the maximum common divisor of 1024 as 1020 for simple hardware implementation.

Subsequently, in the second step S200, the horizontal resolution RSL _H and the vertical resolution RSL _V of the input video mode are divided by the first greatest common factor GCD _H and the second maximum common factor GCD _V. Each of the calculated minimum transform blocks divided into units of the first minimum pixel group MRSL _H and the first minimum line group MRSL _V is determined, and the horizontal resolution PNL _H and the vertical resolution PNL _V of the display device are determined. The minimum screen divided into units of a second minimum pixel group MPNL _H and a second minimum line group MPNL _V respectively calculated by dividing by the first greatest common factor GCD _H and the second maximum common factor GCD _V. Determine the block.

Minimum pixel group and minimum line group (MRSL _H × MRSL _V , MPNL _H × MPNL _V ) for the resolution and LCD panel size of the video mode using the first greatest common factor (GCD _H ) and the second greatest common factor (GCD _V ). The equation to obtain is the same as Equation 1 and Equation 2, respectively.

Table 3 shows the minimum transform block and the minimum screen block determined by the values calculated in Equation 1 and Equation 2.

Minimum conversion block Minimum screen block Horizontal resolution MRSL _H MPNL _H Vertical resolution MRSL _V MPNL _V

Finally, the image scaling process of expansion / contraction to match the resolution (MRSL _H × MRSL _V) of said at least transform block resolution (MPNL _H × MPNL _V) of the minimum screen block in the step 3 (S300) (image scaling processing is repeatedly performed by the greatest common factor in the unit of the minimum transform block to perform full screen display.

In order to help the understanding of the present invention will be described in more detail through a preferred embodiment of the third step (S300).

First, in step S310 it is determined whether the resolution (PNL _H × PNL _V ) of the display device (LCD panel) is larger than the resolution (RSL _H × RSL _V ) of the input video mode.

If the resolution (PNL _H × PNL _V ) of the display device is greater than the resolution (RSL _H × RSL _V ) of the input video mode, the first minimum pixel group MRSL is determined in step S320. _H ) The first multiplication result MRSL _H × i _H calculated by multiplying the number of pixels of _H ) by an arbitrary natural number i _H is within a range equal to or smaller than the number of pixels of the second minimum pixel group PNL _H. A first scale value i _H , which is a natural number to be approximated at, is calculated, and the first multiplication result MRSL _H × i _H is subtracted from the number of pixels in the second minimum pixel group MRSL _H. The offset value (j _H = MPNL _H -MRSL _H xi _H ) is calculated.

That is, in order to calculate the first scale value i _H and the first offset value j _H = MPNL _H -MRSL _H × i _H when the screen is expanded (RSL _H × RSL _V > PNL _H × PNL _V ), Equation 3 is used.

here,

Further, step S330 in the first arbitrary natural number (i _V) a second multiplication result (MRSL _V × i _V) was calculated by multiplying the number of lines of the minimum line group (MRSL _V) is the second minimum line group, equal to the number of lines (MPNL _V), or a small range in a second scale value a natural number such that approximation in the calculation of (i _V), and the second multiplier from the second number of lines of the minimum line group (MPNL _V) results by subtracting the value _(V i × _V MRSL) calculates the second offset value _(V j = _V MPNL -MRSL _V i × _V).

That is, when the screen is expanded (RSL _H × RSL _V > PNL _H × PNL _V ), the second scale value i _V and the second offset value j _V = MPNL _V −MRSL _V × i _V Equation 4 is used.

here,

In operation S340, the first scale value i _H and the second scale value i _V are determined as the number of pixels to be interpolated for each pixel data and the number of lines to be interpolated for each line data, respectively. After determining the first offset value j _H and the second offset value j _V as the number of pixels and lines to be copied per minimum transform block, the process of performing an image enlargement process is performed vertically in units of the minimum transform block. And repeating the first greatest common divisor GCD _H and the second greatest common divisor GCD _{V in the} horizontal direction, respectively, to perform a full screen display.

If the resolution (PNL _H × PNL _V ) of the display device is smaller than the resolution (RSL _H × RSL _V ) of the input video mode (RSL _H × RSL _V <PNL _H × PNL) _V ), similarly to the process of obtaining the first scale value i _H and the first offset value j _{H in} step S350, the product is calculated by multiplying an inverse number of a natural number by the number of pixels of the first minimum pixel group. Calculating a third scale value that is an inverse of a natural number such that a third multiplication result value is approximated within a range equal to or greater than the number of pixels of the second minimum pixel group, and wherein the second minimum pixel group is calculated from the third multiplication result value The third offset value is calculated by subtracting the number of pixels.

In step S360, similar to the process of obtaining the second scale value i _V and the second offset value j _V , a fourth multiplication calculated by multiplying an inverse number of a natural number by the number of lines in the first minimum line group Calculating a fourth scale value which is an inverse of a natural number such that a result value is approximated within a range equal to or greater than the number of lines of the second minimum line group, and the number of lines of the second minimum line group in the fourth multiplication result value Subtract the to calculate the fourth offset value.

In operation S370, the third scale value and the fourth scale value are respectively determined as the number of pixels to be reduced-interpolated for each pixel data and the number of lines to be reduced-interpolated for each line data, and the third offset value and the fourth offset value are determined. Is determined as the number of pixels to be deleted per line and the number of lines, and the process of performing the image reduction process is repeated by the first maximum common factor and the second maximum common factor in the vertical and horizontal directions, respectively, in units of the minimum transform block. To perform a full screen display.

For the purpose of understanding the present invention, as an example of the LCD full screen display technique, when the input video mode is VGA mode and the LCD panel size is SXGA level, the greatest common divisor GCD _H × GCD _V is 640 × 32 as shown in Table 2. . The minimum pixel group and the minimum line group are calculated using Equations 1 and 2 as follows.

,

,

Therefore, it can be seen that the minimum transform block and the minimum screen block are as follows.

,

That is, one pixel data is used to expand to two pixel data on the horizontal axis, and 32 lines data to be used using 15 line data on the vertical axis, respectively, and 640 times (the first greatest common factor) and 32 (the second greatest common factor), respectively. By repeating, we can see that the VGA mode resolution can be increased to SXGA resolution. A first scale value i _H , a first offset value j _H , a second scale value i _V , and a second offset value j _V are obtained based on the minimum transform block.

Therefore, the horizontal axis performs magnified interpolation for every pixel data, the vertical axis also performs magnified interpolation for every line data, and copies the original two line data. FIG. 6 is an example of applying the horizontal magnification interpolation method of the present invention, and illustrates an example of expanding the interpolation of 640 pixels to 1280 pixels. FIG. 7 is an example of applying the vertical magnification interpolation method of the present invention. An illustration showing interpolation.

In the above description, it is obvious that any known interpolation technique may be used as the extended interpolation and reduction interpolation technique applicable to the present invention. In addition, although the display device is limited to the LCD panel in the above description, it is well known that the present invention can be easily applied to any known display device with a slight modification.

Terminologies used herein are terms defined in consideration of functions in the present invention, which may vary according to the intention or customs of those skilled in the art, and the definitions should be made based on the contents throughout the present application. will be.

Although specific embodiments of the invention have been described and illustrated, it will be apparent that the invention may be embodied in various modifications by those skilled in the art.

In addition, since the present invention has been described through the preferred embodiment of the present invention, in view of the technical difficulty aspects of the present invention, those having ordinary skill in the art can easily be different from another embodiment of the present invention. As modifications may be made, it is obvious that both the embodiments and modifications cited in the above description belong to the appended claims.

As described in detail above, a first maximum common factor, which is the greatest common divisor between the horizontal resolution of the input video mode and the horizontal resolution of the display device, is calculated, and a second common factor that is the maximum common divisor between the vertical resolution of the input video mode and the vertical resolution of the display device. After calculating the maximum common divisor, the minimum transform block divided by the first minimum pixel group and the first minimum line group, respectively, calculated by dividing the horizontal resolution and the vertical resolution of the input video mode by the first maximum common divisor and the second maximum common divisor. Determine the minimum screen block divided by the second minimum pixel group and the second minimum line group, respectively, calculated by dividing the horizontal resolution and the vertical resolution of the display apparatus by the first maximum common factor and the second maximum common factor, and then Image zoom that zooms in so that the resolution of the transform block matches the resolution of the minimum screen block. According to the present invention, which performs the full screen display by repeatedly performing the e-ling process by the greatest common factor in the unit of the minimum conversion block, the realization magnification relation between the resolution of the input video mode and the LCD panel size is realized by the digital technique in the LCD driving system. In various video modes, it has the effect of displaying a full screen like a conventional CRT monitor.

In addition, since the full-screen display technique is based on a minimum display pattern, it is easy to implement hardware, and thus it is easily applied to all LCD driving systems equipped with an LCD panel.

Claims (4)

In the resolution conversion method for full screen display when the resolution of the input video mode and the resolution of the display device, Calculate a first greatest common divisor between the horizontal resolution of the input video mode and the horizontal resolution of the display device, and calculate a second greatest common divisor between the vertical resolution of the input video mode and the vertical resolution of the display device A first step of doing; Determine a minimum transform block divided by a first minimum pixel group and a first minimum line group, respectively, calculated by dividing the horizontal resolution and the vertical resolution of the input video mode by the first greatest common factor and the second greatest common factor; Determining a minimum screen block divided by a second minimum pixel group and a second minimum line group, respectively, calculated by dividing the horizontal resolution and the vertical resolution of the display apparatus by the first common factor and the second maximum common factor; And And performing a full screen display by repeatedly performing the image scaling process of increasing and decreasing the resolution of the minimum transform block to match the resolution of the minimum screen block by the greatest common factor in units of the minimum transform block. A resolution converting method for a full screen display. The method of claim 1, wherein the third step, Determining whether the resolution of the display device is greater than the resolution of the input video mode; If the resolution of the display device is greater than the resolution of the input video mode, the first multiplication result value calculated by multiplying an arbitrary natural number by the number of pixels of the first minimum pixel group is the second minimum value. A first scale value is calculated that is a natural number to approximate within a range equal to or less than the number of pixels in the pixel group, and the first offset value is calculated by subtracting the first multiplication result value from the number of pixels in the second minimum pixel group. Making a step; A second scale value, which is a natural number, is calculated such that the second multiplication result value calculated by multiplying a line number of the first minimum line group by an arbitrary natural number is within or equal to or less than a line number of the second minimum line group. Calculating a second offset value by subtracting the second multiplication result value from the number of lines in the second minimum line group; And The first scale value and the second scale value are respectively determined as the number of pixels to be interpolated for every pixel data and the number of lines to be interpolated for every line data, and the first offset value and the second offset value are determined as the minimum value. After determining the number of pixels to be copied per transform block and the number of lines, the process of performing image magnification is repeated by the first greatest common factor and the second greatest common factor in the vertical and horizontal directions in units of the smallest transform block, respectively. And performing a screen display. The method of claim 2, If the resolution of the display device is smaller than the resolution of the input video mode, the third multiplication result value calculated by multiplying an inverse number of a natural number by the number of pixels of the first minimum pixel group is determined. Calculating a third scale value which is an inverse of a natural number to be approximated within a range equal to or greater than the number of pixels of the second minimum pixel group, and subtracting the number of pixels of the second minimum pixel group from the third multiplication result value; Calculating an offset value; A fourth multiplication result calculated by multiplying the number of lines in the first minimum line group by an inverse number of a natural number, and is a reciprocal of a natural number which is approximated within a range equal to or greater than the number of lines in the second minimum line group. Calculating a fourth scale value and subtracting the number of lines of the second minimum line group from the fourth multiplication result value to calculate a fourth offset value; The third scale value and the fourth scale value are respectively determined as the number of pixels to be reduced-interpolated for every pixel data and the number of lines to be reduced-interpolated for every line data, and the third offset value and the fourth offset value are determined as the minimum value. After determining the number of pixels and lines to be deleted per transform block, the process of performing the image reduction process is repeated by the first greatest common factor and the second greatest common factor in the vertical and horizontal directions for each of the minimum transform blocks. The method of claim 1 further comprising the step of performing the display. The display apparatus of claim 1, wherein the display device Resolution conversion method for full-screen display, characterized in that the LCD (Liquid Crystal Display) panel.