KR100207545B1 - Apparatus for generating sawtooth wave having function of compensating distortion in monitor - Google Patents

Abstract

A sawtooth wave generator having a distortion correction function of a monitor is disclosed. The apparatus for correcting distortion caused by changing the vertical size of the image displayed on the monitor and the amount of movement in the vertical direction, the waveform generating means for generating a basic sawtooth wave from the horizontal synchronizing signal which increases to a predetermined level based on the vertical synchronizing signal. And multiplication means for multiplying the basic sawtooth wave and the first factor for adjusting the vertical size, adding means for adding a second factor for adjusting the output and the movement amount of the multiplication means, and first square means for squaring the output of the addition means. And multiplying the outputs of the second and third square means by the cube of the output of the addition means, the outputs of the first and second square means by the first, second and third correction coefficients, respectively, and add the multiplied values as sawtooth waves. And an arithmetic means for outputting, wherein the inverse distortion due to the vertical size change of the screen and the amount of movement in the vertical direction does not occur, and the EW change is always fixed. Automatically can be performed, there is an effect that does not require re-EW EW for adjusting the distortion generated by the vertical size conversion when initializing set.

Description

Sawtooth generator with distortion correction function of monitor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical size and a vertical movement of an image displayed on a monitor. In particular, a sawtooth wave generator having a distortion correction function of a monitor that corrects distortion generated by moving a screen in a vertical size and a vertical direction. It is about.

Current television monitors are gradually becoming larger, and their aspect ratios are diversified to 4/3, 16/9, and 12.8 / 9. In addition to the need for deflection correction for displaying an image to meet the size and size of a monitor that is being enlarged and diversified, a necessity of basically adjusting a screen size arises. That is, even if the value to obtain the same vertical size is transferred to the monitor set, the vertical size of the image displayed on the monitor is different according to the difference between the elements of each set and the degree of convergence by the coil. For each set, you need to adjust the vertical size.

Hereinafter, with reference to the accompanying drawings, the configuration and operation of a sawtooth wave generating apparatus of a conventional monitor will be described as follows.

1 is a view for explaining a sawtooth wave generator of a conventional monitor, the sawtooth wave generator 10, the buffer 12, the first and second square parts 14 and 16, the calculation unit 18, the multiplier 20 ) And an adder 22.

The sawtooth wave generator 10 shown in FIG. 1 initializes the basic sawtooth wave X, which is initialized in response to the vertical sync signal Vsync input in one field period according to the type of the video signal and increases to a predetermined amount, to the horizontal sync signal Hsync. Occurs from The buffer 12 buffers and outputs the basic sawtooth wave after the first and second square parts 14 and 16 perform the square operation, and the first and second square parts 14 and 16 output the basic sawtooth wave. The square operation and the cube operation are output to the operation unit 18, respectively. The calculation unit 18 is configured to correct the linear errors generated in the vertical direction of the image, and to correct the correction coefficients A, B, and C inputted from the outside, the buffer 12, and the first and second square parts 14 and 16. Each output is multiplied and then added, and the added result is output to the multiplier 20 in a waveform such as S-correction. The multiplier 20 multiplies the output of the calculator 18 by a factor Vsize for adjusting the vertical size of the image and outputs the result to the adder 22. The adder 22 adds the multiplied result to a factor Vshift for shifting the vertical position of the image, and outputs the added result as a sawtooth wave through the output terminal OUT.

In the above-described conventional sawtooth wave generator, the sawtooth wave with the change of the Vsize simply appears to multiply the Vsize by the sawtooth wave before the change, which is a result of simply multiplying the components such as the S-correction component and the vertical linearity on the sawtooth wave. do. However, since the S-correction and the vertical linearity required for the actual screen are related to the position of the screen, simply multiplying the Vsize cannot be satisfied, and in some cases, there is a problem that distortion occurs more.

On the other hand, the effect of changing the vertical size of the displayed image not only affects the image size but also requires changing the left / right pincushion error (or EW (East West)). In addition, when the screen position is to be moved in the vertical direction, the EW needs to be changed.

FIG. 2 is a block diagram of another conventional sawtooth wave generator, wherein the sawtooth wave generator 40, the buffer 42, the first, second and third square parts 44, 46 and 48, and the first and second calculation units ( 50 and 52, first, second and third multipliers 54, 56 and 58 and adder 60.

The sawtooth generator 40, the first operator 50, the first multiplier 54 and the adder 60 shown in FIG. 2 are the sawtooth generator 10, the calculator 18, the multiplier (shown in FIG. 20) and the adder 22 respectively perform the same function. The second operation unit 52 multiplies the correction coefficients D, E, and F by the square roots to correct pin cushion errors generated in the vertical direction of the screen, and then generates EW in a parabolic waveform. The correction coefficients D, E And F to make an EW waveform suitable for screen correction. The output of the second operator 52 is multiplied by the value of Vsize ² output from the second multiplier 56 in the third multiplier 58, and the multiplied result is output as a signal for EW correction through the output terminal OUT2. .

The aforementioned conventional sawtooth wave generator performs EW correction independently of EW. That is, in the conventional sawtooth wave generator shown in FIG. 2, the EW correction as the Vsize changes is simply changed in proportion to the square root of Vsize. Therefore, the conventional sawtooth wave generator has a problem that the EW change due to the change in Vsize cannot be represented correctly. In addition, when the direction of the screen is moved in the vertical direction, the conventional sawtooth wave generator shown in FIG. 2 cannot convert the EW, which causes a problem of distortion of the screen. That is, when the screen is moved to the bottom, the EW value (for example, upper pin cushion) applied to the upper part is applied to the part moved to the lower part as it is, so that unwanted correction is made and the back distortion of the screen occurs. There was this.

An object of the present invention is to provide a distortion correction apparatus for a monitor that corrects reverse distortion of a screen according to a vertical size of a screen and a movement in a vertical direction.

Another object of the present invention is to provide a distortion correction device for a monitor that corrects pin cushion errors caused by vertical size of a screen and movement in a vertical direction.

1 is a view for explaining a sawtooth wave generating device of a conventional monitor.

2 is a block diagram of another conventional sawtooth wave generator.

3 is a block diagram of a sawtooth wave generator having an inverse distortion correction function according to the present invention.

4 (a) to 4 (c) show waveform diagrams of the sawtooth wave before and after the Vsize change, respectively.

5 is a block diagram of a sawtooth wave generator having a pin cushion error correction function according to the present invention.

In order to achieve the above object, the sawtooth wave generator having a distortion correction function of the monitor according to the present invention for correcting the distortion caused by changing the vertical size and the amount of movement in the vertical direction of the image displayed on the monitor, based on the vertical synchronization signal Waveform generation means for generating a basic sawtooth wave increasing from the horizontal synchronizing signal to a predetermined level, multiplication means for multiplying the basic sawtooth wave and the first factor for adjusting the vertical magnitude, and adjusting the output and the movement amount of the multiplication means. Adding means for adding a second factor, first square means for squaring the output of said adding means, second square means for cubed output of said adding means, and outputs of said adding means, said first and said second means. The number of operations of multiplying the outputs of the second square means with the first, second and third correction coefficients respectively, and adding the multiplied values to output the sawtooth wave. It is composed of are preferred.

In order to achieve the above object, the sawtooth wave generator having a distortion correction function of the monitor according to the present invention for correcting the left and right pincushion error caused by changing the vertical size and the amount of movement in the vertical direction of the image displayed on the monitor, Waveform generating means for generating from the horizontal synchronizing signal a basic sawtooth wave which increases to a predetermined level on the basis of the vertical synchronizing signal, multiplication means for multiplying the basic sawtooth wave with a first factor for adjusting the vertical magnitude, and output of the multiplication means And an adding means for adding a second factor for adjusting the movement amount, a first square means for squaring the output of the adding means, a second square means for cubed the output of the adding means, and an output of the adding means. A third, fourth, and third correction means for quadratic third means, the output of the addition means, and the outputs of the first and second square means. And multiply each of the first operation means, the output of the addition means, and the outputs of the second and second square means with the fourth, fifth and sixth correction coefficients, respectively, And second calculating means for adding the multiplied value and outputting the left / right cushion error as a signal for correcting the left / right cushion error.

Hereinafter, the configuration and operation of a distortion correction apparatus for a monitor according to the present invention will be described with reference to the accompanying drawings.

3 is a block diagram of a sawtooth wave generator having an inverse distortion correction function according to the present invention, wherein the waveform generator 80, the multiplier 82, the adder 84, the buffer 86, the first and second square parts And 88 and 90 and arithmetic unit 92.

In the apparatus shown in FIG. 3, the positions of the multiplier 82 and the adder 84 are different from those of the multiplier 20 and the adder 22 shown in FIG. That is, the waveform generator 80 corresponds to the sawtooth wave generator 10 shown in FIG. 1, which is initialized in response to the vertical synchronization signal Vsync input in one field period according to the type of the video signal, and increases to a predetermined amount. The basic sawtooth wave is generated from the horizontal synchronization signal Hsync input through the input terminal IN. The multiplier 82 multiplies the output of the waveform generator 80 by a factor Vsize for adjusting the vertical size of the image and outputs the result to the adder 84. The adder 84 adds the multiplied result with a factor Vshift for shifting the vertical position of the image, and adds the added result Z to the buffer 86 and the first and second square parts 88 and 90. Output The buffer 86 buffers and outputs the output of the adder 84 for the time during which the first and second squares 88 and 90 perform the square operation, and outputs the first and second squares 88 and 90. Squares and cubes the output Z of the adder 84, respectively, and outputs the result to the calculating unit 92. The calculation unit 92 is configured to correct the linear errors generated in the vertical direction of the image, and to correct the correction coefficients A, B, and C inputted from the outside, and the buffers 86, the first and second squares 88 and 90. Each output is multiplied and then added, and the added result is output as a sawtooth wave through the output terminal OUT.

4 (a) to 4 (c) show waveform diagrams of the sawtooth wave before and after the Vsize change, respectively.

For example, when the Vsize is reduced to 3/4, the sawtooth wave Y by the conventional apparatus shown in FIG. 1 is represented by the following Equation 1, and the sawtooth wave by the apparatus according to the present invention shown in FIG. Y ') becomes as shown in Equation 2 below.

[Equation 1]

[Equation 2]

Unlike Equation 1, as can be seen in Equation 2, since the apparatus according to the present invention substantially reduces all parts of the sawtooth wave 100 shown in FIG. Can be reduced.

For example, when the screen of 100% is reduced to 3/4, as shown in FIG. 4 (a), the value of the sawtooth wave 100 should be represented by a and i. If the screen size is changed, the values such as S-correction and linearity contained in the sawtooth wave are maintained. However, when the screen is reduced to 3/4 by using the conventional apparatus shown in FIG. 1, values such as S-correction and linearity in the sawtooth wave are changed as shown in FIG. 4B, and distortion occurs. On the other hand, when the screen is reduced to 3/4 by using the apparatus according to the present invention shown in Fig. 3, the S-correction and linearity contained in the sawtooth wave even if the value of Vsize is changed is shown in Fig. 4 (c). As shown by i and i, inverse distortion due to movement in the Vsize and vertical directions does not occur.

As a result, the apparatus according to the present invention shown in FIG. 3 can fluctuate in the vertical size of the screen and move in the vertical direction without reverse distortion.

5 is a block diagram of a sawtooth wave generator having a pin cushion error correction function according to the present invention, which includes a waveform generator 110, a multiplier 112, an adder 114, a buffer 116, first, second and third. Squares 118, 120, and 122 and first and second operations 124 and 126.

The waveform generator 110, the multiplier 112, the adder 114, the buffer 116, the first and second square parts 118 and 120 and the first operator 124 shown in FIG. The waveform generator 80, the multiplier 82, the adder 84, the buffer 86, the first and second squares 88 and 90 and the calculation unit 92 perform the same functions. Meanwhile, the third square unit 122 and the second operator 126 perform the same functions as the third square unit 48 and the second operator 52 illustrated in FIG. 2.

For example, if the pin cushion is displayed on the screen as shown in Equation 3 below, which is the output Y of the second operation unit 126, the EW change due to the vertical size change of the screen can be obtained by the conventional apparatus shown in FIG. Although it can be made correctly, a general pin cushion is at least shown as the following equation (4), so that the correct calibration cannot be performed by the conventional apparatus shown in FIG.

[Equation 3]

[Equation 4]

However, the apparatus according to the present invention shown in FIG. 5 can correctly correct a change in EW due to a change in the vertical size of the screen. That is, since the value Z input to the second operator 126 becomes as shown in Equation 5 below, the EW output Y output through the output terminal OUT2 becomes as shown in Equation 6 below.

[Equation 5]

[Equation 6]

Therefore, when a sawtooth wave is generated using the apparatus according to the present invention, the block generating the EW receives the position shift value of the screen and generates the EW so that the reverse distortion of the screen does not occur.

As described above, the apparatus for correcting distortion of the monitor according to the present invention can always perform the EW change automatically and accurately and accurately without inverting distortion due to the vertical size change of the screen and the amount of vertical movement. In this case, there is no need for EW readjustment to adjust EW distortion caused by vertical size conversion.

Claims (2)

In the sawtooth wave generator having a distortion correction function of the monitor for correcting the distortion caused by changing the vertical size of the image displayed on the monitor and the amount of movement in the vertical direction, Waveform generation means for generating, from the horizontal synchronization signal, a basic sawtooth wave which increases to a predetermined level based on the vertical synchronization signal; Multiplication means for multiplying the basic sawtooth wave and a first factor for adjusting the vertical size; Adding means for adding an output of said multiplication means and a second factor for adjusting said movement amount; First square means for squaring the output of said adding means; Second square means for cubed output of the adding means; And And computing means for multiplying the outputs of the adding means and the outputs of the first and second square means with first, second and third correction coefficients respectively, and adding the multiplied values to output them as sawtooth waves. Sawtooth wave generator having distortion correction function of monitor. In the sawtooth wave generator having a distortion correction function of the monitor for correcting the left and right pincushion error caused by changing the vertical size of the image displayed on the monitor and the amount of movement in the vertical direction, Waveform generation means for generating, from the horizontal synchronization signal, a basic sawtooth wave which increases to a predetermined level based on the vertical synchronization signal; Multiplication means for multiplying the basic sawtooth wave with a first factor for adjusting the vertical size; Adding means for adding an output of said multiplication means and a second factor for adjusting said movement amount; First square means for squaring the output of said adding means; Second square means for cubed output of the adding means; Third square means for quadrupling the output of said adding means; First calculating means for multiplying the output of said adding means and the outputs of said first and said second square means with first, second and third correction coefficients respectively, and adding the multiplied values to output as sawtooth waves; And Multiply the output of the adding means and the outputs of the second and second square means with fourth, fifth and sixth correction coefficients respectively, and add the multiplied value as a signal for correcting the left / right cushion error A sawtooth wave generator having a distortion correction function of a monitor, characterized by comprising a second calculation means.

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