KR100404394B1 - Apparatus and method for automatic regulation of display screen size of multi-converter output - Google Patents

Abstract

According to the present invention, the display screen of the output of the multi-converter can be displayed automatically at the same position and size. The display screen size adjusting device of the multi-converter output according to the present invention vertically displays the actual display area of the PC video signal. And horizontal and vertical size detection means for counting the horizontal level, and outputting a control signal for detecting the difference between the count value and the standard data, and adjusting the position and size of the display area of the PC image signal by the difference. An A / D and PLL adjusting unit for converting a microcomputer and a PC video signal into a digital signal and adjusting the PLL data of the video signal according to the control signal of the microcomputer, and the digitally converted PC video signal at a corresponding magnification by the microcomputer. A magnification conversion unit for converting the digital signal from the magnification conversion unit into a D / A conversion unit; Hwandoen characterized by including a digital display for displaying the analog video signal analog PC display unit and the PC digital video signal for displaying a memory the standard data of the display area is stored.

According to the present invention, according to the VGA card of the PC input to the output display device of the multi-converter automatically detects the difference according to the horizontal and vertical frequency even in the same mode, and then the screen position and By allowing you to adjust the size, it is displayed in the desired size.

Description

Apparatus and method for automatic regulation of display screen size of multi-converter output}

The present invention provides a multi-converter for displaying a video graphic signal of a PC on a TV. In particular, it is possible to automatically adjust the screen size of the horizontal frequency difference according to the VGA card of the PC to a desired size. An apparatus and method for automatically adjusting the display screen size of a multi-converter output.

In recent years, with the emergence of large-sized TVs and projection TVs of 30 inches or more in accordance with the trend of large display devices, digital devices such as thin panelized plasma display panels (PDPs) and liquid crystal displays (LCDs) have been introduced. Many display devices have also been used to display PC input.

In order to display such PC input, various PC signals (VAG, XVGA, XGA, etc.) must be used by using a converter or a built-in scaling IC. In this case, there are many PC signals and similar signals. It was difficult to display the correct size on the screen.

In other words, if an analog display device such as a projection TV is displayed in a similar size to some extent, it is not a big problem, but it may be fatal for a digital display device such as a PDP and an LCD. Thus, in the related art, when the mode of the PC signal is changed or another type of signal is input, the user cannot see the correct size only by adjusting the menu for adjusting the position and size.

The display screen size adjusting device of the conventional multi-converter output is as shown in FIG.

Referring to FIG. 1, a PC 101 for outputting a video signal, an A / D and PLL adjusting unit 102 for converting the PC video signal into a digital signal and adjusting phase synchronization, and the digitally converted video signal A magnification converter 103 for converting the magnification of a predetermined size, a digital / analog converter 104 for converting the magnified-converted PC video signal to an analog signal, and anol for displaying the analog-converted PC video signal. A log display unit 105, a digital display unit 106 for displaying the digital PC image signal with the magnification conversion therein; a memory 107 storing a reference value for the magnification conversion of the magnification conversion unit 103; The microcomputer 108 is configured to control the magnification of the magnification converting unit 103 according to a desired scaling adjustment.

Referring to the accompanying drawings, a display size adjustment device for a conventional multi-converter output configured as described above is as follows.

The PC video signal of the constant mode output from the PC 101 is converted into a digital signal by the A / D and PLL adjusting unit 102, and the phase synchronization is adjusted, and then input to the magnification converting unit 103.

Then, the PC image signal is converted and output at the magnification set by the magnification converting unit 103, and the magnified image signal is converted into an analog signal through the D / A converting unit 104 to be converted into an analog display unit 105. ) And the magnified video signal is a digital signal and is displayed on the digital display unit 106.

In this way, if the input signal is scaled up / down in a certain mode, the desired output mode can be obtained. The data display area and data area are different depending on the VGA card used in the PC. The position and size of the unit do not fit well and must be adjusted again.

To this end, the user always makes adjustments. When the microcomputer 108 adjusts the magnification of the magnification conversion unit 103 according to the user's adjustment data, the corresponding mode is taken from the memory 107 and outputted, thereby outputting a desired output. Output in mode.

However, conventionally, in order to display a PC image signal to an analog display unit 105 such as a large TV or a projection TV and a digital display unit 106 such as an LCD or a PDP as described above, the PC image signal is always in a constant mode regardless of the input signal. The display area and data area are different depending on the VGA card used in the PC. Whenever the mode is changed or the PC is replaced, the displayed position and size do not match well. There was a hassle.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is always in a constant position even if the mode of the input signal is changed in a system in which a multi-converter having a constant output form or a built-in scale conversion for a variety of inputs of a PC is changed. In order to display and maintain the screen size constantly, a means for counting the horizontal level and the vertical level of the PC video signal is provided to determine the size of the currently input PC video signal. It is an object of the present invention to provide an apparatus and method for adjusting the display screen size of a multi-converter output so that it can be adjusted accordingly.

1 is a block diagram showing a display screen size adjusting device of a conventional multi-converter output.

2 is a block diagram showing an automatic display screen size adjustment device of the multi-converter output according to an embodiment of the present invention.

3 is a waveform diagram showing a standard screen data area and an actual data area according to a VGA card according to an embodiment of the present invention.

4 is a flowchart illustrating a method for automatically adjusting display screen size of a multi-converter output according to an exemplary embodiment of the present invention.

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

201 ... PC 202 ... A / D & PLL Control

203 ... magnification converter 204 ... D / A converter

205 ... analog display

206 digital display

207 Memory ... 208

209.Horizontal size detection means 209a ... Horizontal level comparison unit

209b ... horizontal counter section 209c ... counter section

210.Vertical size detection means 210a ... vertical level comparison unit

210b ... vertical counter

In order to achieve the above object, the apparatus for adjusting the display screen size of the multi-converter output according to the present invention is capable of linking with a PC and having an A / D converter / PLL control unit and a D / A converter. A memory for storing standard data for the display area of the video signal output from the digital display, horizontal size detecting means for detecting a horizontal count value of the actual data area from the horizontal synchronizing signal inputted from the PC, and inputted from the PC Vertical size detection means for detecting a vertical direction count value of an actual data area in a vertical synchronization signal, a difference between a count value detected by the horizontal and vertical size detection means and standard data previously stored in the memory, Control signal for adjusting the display area position and size of the video signal input from the PC by the difference Magnification conversion for converting the microcomputer output to the A / D converter / PLL control unit and the video signal output from the A / D converter / PLL control unit according to the control signal of the microcomputer to the corresponding magnification and outputting the same to the D / A converter. And a display unit having an analog display unit for displaying the analog PC image signal output from the D / A converter and a digital display unit for displaying the digital PC image signal output from the magnification converter. It is done.

In detail, the horizontal size detecting unit includes a horizontal level comparator for comparing the horizontal levels of the video signal output from the PC and inverting the output according to the level difference, and a horizontal count of the actual data area with the inverted output of the level comparator. And a counter for counting a value and outputting the counted value to a microcomputer, and a counter for outputting the counted value to the microcomputer.

In detail, the value counted by the horizontal counter is from the end of the horizontal sync signal to the start of the actual display area, and the value counted by the counter is from the start of the actual display area to the end. do.

In detail, the vertical size detecting unit includes a vertical level comparator for comparing the vertical level of the video signal output from the PC and inverting the output according to the level difference, and a vertical level of the actual display video signal with the inverted output of the vertical level comparator. And a horizontal counter unit for counting the count value and outputting the count value to the microcomputer.

In detail, the value counted by the horizontal counter may be from a time point at which the vertical synchronization signal ends to a time point at which the actual display area starts.

A display screen size adjustment method of a multi-converter output according to the present invention is a screen size adjustment method of a video display device that can be linked with a PC and has a memory, based on an actual data area of a video signal input from the PC. Receiving a value obtained by counting horizontal and vertical levels, comparing the input horizontal and vertical level count values with a standard value previously stored in the memory, and detecting a difference; And when the difference value is detected as a result of the comparison, adjusting the horizontal position of the currently displayed analog and digital display screens by the pixel corresponding to the difference.

Preferably, if the input count value is a count value of an actual display area, comparing the standard value with the standard value to determine whether there is a difference value, and if there is a difference value, the difference of the PLL data as much as the difference value. Increasing or decreasing the pixel clock to readjust the PLL so that the analog and display screen sizes currently displayed are the same as the standard data size.

Preferably, if the input count value is a vertical count value of the PC signal, comparing the standard value with the standard value to determine whether there is a difference value, and if there is a difference value with the standard value as a result of the checking, the difference is corresponding to the difference value. And adjusting the vertical position of the currently displayed analog and display screen by adjusting the vertical position by the vertical line in the up and down directions.

Hereinafter, with reference to the accompanying drawings as follows.

2 is a block diagram illustrating an apparatus for adjusting a display screen size of a multi-converter output according to an exemplary embodiment of the present invention, FIG. 3 is a signal waveform diagram for detecting a difference value between an actual data area and a standard data area, and FIG. 2 is a diagram illustrating a method of adjusting a display screen size of a multi-converter output according to an exemplary embodiment of the present invention.

2, a PC 201 for outputting a PC video signal, an A / D and PLL adjusting unit 202 for converting the PC video signal into a digital signal and adjusting a PLL, and the digitally converted PC video signal. A magnification converter 203 for converting the magnification of the digital signal, a digital / analog (D / A) converter 204 for outputting the magnified video signal as an analog video signal, and an analog display for displaying an analog video signal A unit 205 and a digital display unit 206 for displaying a digital image signal, a memory 207 storing image data values for scaling conversion, and a PLL adjustment and scaling conversion are controlled from values of the display area difference compared to the standard. The microcomputer 208, the horizontal size detecting means 209 for detecting the horizontal magnitude of the PC video signal and outputting it to the microcomputer 208, and the vertical size for detecting the vertical size of the PC video signal and outputting it to the microcomputer 208. detection It consists of a stage 210.

Here, the horizontal size detecting means 209 has a horizontal level comparing unit 209a for inverting the output signal when the horizontal level of the PC video signal changes, and the change in the horizontal level comparing unit 209 actually starts from the viewpoint. The horizontal counter unit 209b for counting and outputting the data area to the microcomputer 208, and the counter unit 209c for counting the actual display area of the change by the horizontal level comparison unit 209a.

In addition, the vertical size detecting unit 210 uses a vertical level comparator 210a for inverting the output when the vertical level of the PC video signal changes and outputs an actual data area by the vertical level comparator 210a. The vertical counter unit 210b counts the vertical level.

The apparatus and method for adjusting the display screen size of the multi-converter output according to the embodiment of the present invention configured as described above will be described with reference to the accompanying drawings.

First, the video signal of the VGA card output from the PC 201 is converted into a digital signal by the A / D and PLL adjusting unit 202 and is input to the magnification converting unit 203 by adjusting the phase synchronization loop PLL. The magnification converting unit 203 then switches the mode to the desired output form.

At this time, if the input signal is converted into desired data according to the control signal of the microcomputer 208 while reading / writing from the memory 207 and then output, the data is converted into an analog signal by the digital / analog converter 204. The digital data is displayed on the analog display unit 205 and the magnified-converted digital data is displayed on the digital display unit 206.

On the other hand, if the size of the screen displayed on the display unit 205, 206 is not always displayed at a constant position when the VGA card is changed due to the replacement of the PC, the horizontal size detecting means 209 is an image output from the PC 201 The actual horizontal size of the signal is detected and output to the microcomputer 208.

To this end, the horizontal size detecting means 209 is composed of a horizontal level comparator 209a, a horizontal counter 209b, and a counter 209c, and the horizontal level comparator 209a adjusts the horizontal level in the PC image signal. Compare and change the output from low (L) to high (L) when the actual data area appears. Then, the horizontal counter 209b counts the rising edge of the horizontal synchronization signal (H-Sync) from the rising edge of the horizontal synchronization signal (H-Sync) until the actual data region becomes high, that is, from the end of the horizontal synchronization signal to the beginning of the actual data region. Is output to the microcomputer 208.

The microcomputer 208 compares the value counted by the horizontal counter unit 209b with the standard value A of the standard display area, and if it is the same, does not adjust the horizontal position.

3 is a horizontal synchronous signal (H-Sync) and (2) is a view showing a display area A of standard data, where 'a' is a point at which the horizontal synchronous signal ends (a) Is a standard size from the point 'A' to the time at which the actual data area starts.

If the actual display area starts from the 'me' and 'multi' points as shown in (3) and (4) of Fig. 3, the value counted by the horizontal counter portion 209b is " a11 " (A-a11 = b), move the screen horizontally to the right by the pixel corresponding to "b". If "a12" is larger than "a" (a-a12 = c), It moves the horizontal position to the left by the pixel corresponding to "c".

That is, the microcomputer 208 detects the difference between the horizontal sync signal and the position where the actual data area starts and the difference between the standard value and the standard value of the standard display area, thereby controlling the magnification converter 203 to detect the above. By moving the position of the horizontal screen to the left or the right by the difference of the starting position of the displayed display area, the starting point in the horizontal direction of the displayed screen becomes the same as the standard data.

The counter unit 209c of the horizontal screen size detecting unit 209 counts the data (RGB) section from high to low again from the time when the actual data area is changed from low to high from the horizontal level comparison unit 209a. do. The counted value is input to the microcomputer 208, and the microcomputer 208 displays the same value as it is compared with the standard value of the standard display area, and otherwise adjusts the screen size.

If the microcomputer 208 counts the value counted by the counter 209c, the count value of the actual data section A11 becomes smaller than the standard data section A as shown in FIG. 3 (5) (A-A11 = B). ). This is because the pixel clock is increased as much as the difference value. Therefore, PLL data corresponding to 'B' is outputted to the PLL adjusting unit 202 so that the pixel clock of the PC image signal is lowered. This is done by adjusting the PLL data so that it is the same in comparison to the.

In addition, if the actual data area 'A12' is larger than the display area A of the standard data (A-A12 = C), that is, the pixel clock is lowered by the difference value as shown in (6) of FIG. If you adjust the PLL data corresponding to 'to make the pixel clock higher, and then adjust the PLL data to be the same as the standard value, it is displayed with the same size as the standard data.

On the other hand, the vertical size detecting means 210 has a time when the output is changed from low to high when the actual data area appears in the vertical level comparison unit 210a. That is, the value counted by the vertical counter unit 210b from the rising edge of the vertical synchronization signal V-Sync (7 in FIG. 3) to the high level H in the vertical level comparator 210a. When output to the microcomputer 208, the microcomputer 208 compares the vertical count value with a standard value, and if it is the same, no vertical position adjustment is necessary, and if it is large or small, the vertical position adjustment is necessary.

As an example, FIG. 3 (7) is a waveform diagram showing a vertical synchronizing signal, and (8) is a diagram showing a display area of standard data, which is a value counted by the vertical counter unit 210b, that is, a vertical synchronizing signal. If the distance value from the rising edge to the start of the display area is smaller than 'd' by 'd11' as shown in (9) of FIG. 3, the downward direction may be moved by the line corresponding to 'e'. If 'd12' is larger than 'd' as in 10), move upward as much as the line corresponding to 'f'.

In this way, the actual display data area detected by the horizontal and vertical size detecting means 209 and 210 is counted, and the screen size as well as the horizontal and vertical position of the currently displayed data area are compared through comparison with the standard display data area. Adjust the size to the desired position and display it.

4 is a flowchart illustrating a method of adjusting a display screen size of a multi-converter output according to an exemplary embodiment of the present invention. Referring to FIG. 4, the horizontal count value a 'of the input PC video signal is received from the horizontal counter 209b (S201), and the value (a) of the standard display area is compared with the horizontal count value (a'). Thus, it is detected whether there is a difference value (a-a '> 0) (S202).

If the result of the comparison in step S202 is a positive value (aa '> 0), the positive value is obtained (a-a' = b) (S203), and the calculated positive value (b). The horizontal position is adjusted by moving the horizontal position to the right by the pixel corresponding to (S204) (S205).

However, if the result of the comparison in step S202 is a negative value (a-a '<0), the negative value is obtained (a-a' = c) (S203a), and the obtained negative value (c). The horizontal position is shifted to the left by the pixel corresponding to (S204a) to adjust the horizontal position (S205).

When the count value A 'of the actual display area of the PC video signal counted by the counter unit 209c is inputted, the counted value A' and the standard value A of the standard display area as a reference thereof and It is detected whether there is a difference value (A-A '= 0) (S207). If there is a difference value as a result of the comparison in step S207, it is determined whether the value is a positive value or a negative value (A-A '> 0) (S208). If it is a positive value, adjust the PLL so that the pixel clock of the PLL adjuster is small (S209), and if it is a negative value, adjust the PLL to increase the pixel clock of the PLL adjuster (S209a), and the count value and standard of the actual display area By repeating the steps S207, S208, S209, and S209a until the standard values of the display areas are the same, the data of the standard display area and the data values of the actual display area are the same size.

When the vertical count value d 'of the input PC signal is detected and input by the vertical counter unit 210b (S210), the vertical count value d' and the standard value d as a reference thereof are determined. By comparison, it is detected whether it is a positive value or a negative value (S211). If a positive value is detected as a result of the comparison, the positive value e is detected (d-d '= e) (S212), and the vertical position is moved downward by a line corresponding to the detected size. If a negative value is detected as a result of the comparison (S213 and S214), the loudness f is detected (d-d '= f) (S212a), and the vertical position is adjusted by a line corresponding to the loudness. The vertical position is adjusted by moving upward (S213a, S214).

In this way, the horizontal count value, the actual display area count value, and the vertical count value of the PC video signal inputted according to the various VGA cards are detected, and the difference between the actual display area and the standard display area is obtained, and the PC video signal by the difference is obtained. The horizontal position, horizontal size and vertical position of are automatically adjusted.

As described above, the present invention, when displaying a PC signal and similar signals to devices such as analog and digital display, it is possible to automatically adjust the position and size of the screen, the user according to the input signal source Eliminates the inconvenience of having to adjust it manually, and has the effect of always displaying the same display area and size when displaying various PC signals such as VGA, SVGA, XGA, etc. on the digital display device. .

Claims (5)

In a video display device that can be connected to a PC and has an A / D converter / PLL control unit and a D / A converter, A memory for storing standard data of a display area of an image signal output from the PC; Horizontal size detecting means for detecting a count value in a horizontal direction of an actual data area from a horizontal synchronizing signal input from the PC; Vertical size detecting means for detecting a count value in the vertical direction of the actual data area from the vertical synchronizing signal input from the PC; The control signal for detecting the difference between the count value detected by the horizontal and vertical size detecting means and the pre-stored standard data, respectively, and adjusting the display area position and size of the video signal input from the PC by the difference A. A microcomputer that outputs to the / D converter / PLL control unit; A magnification converter for converting an image signal output from the A / D converter / PLL control unit into a corresponding magnification according to the control signal of the microcomputer and outputting the same to the D / A converter; And, And a display unit having an analog display unit for displaying the analog PC image signal output from the D / A converter and a digital display unit for displaying the digital PC image signal output from the magnification converter. Display screen size adjuster of converter output. The horizontal level comparator according to claim 1, wherein the horizontal magnitude detecting means compares a horizontal level of an image signal output from the PC and inverts the output according to the level difference, and outputs the horizontal level comparator. And a horizontal counter for counting and outputting a horizontal count value to a microcomputer, and a counter unit for counting an actual data area using the inverted output of the level comparator and outputting the counted value to the microcomputer. Screen size adjuster. In the screen size adjustment method of a video display device that can be connected to a PC and equipped with a memory, Receiving a value obtained by counting horizontal and vertical levels based on an actual data area of an image signal input from the PC; Detecting the difference by comparing the input horizontal and vertical level count values with a standard value previously stored in the memory; And, And adjusting the horizontal position of the currently displayed analog and digital display screens by the pixel corresponding to the difference when the difference value is detected as a result of the comparison. 4. The method of claim 3, further comprising: if the input count value is a count value of an actual display area, comparing the standard value to determine whether there is a difference value; If there is a difference value, the step of increasing or decreasing the pixel clock of the PLL data by the difference so that the PLL is readjusted so that the size of the currently displayed analog and display screen is the same as the standard data size. How to adjust the display screen size of the multi-converter output. 4. The method of claim 3, further comprising: if the input count value is a vertical count value of the PC signal, comparing the standard value to determine whether there is a difference value; If there is a difference between the standard value and the result of the check, adjusting the vertical position by up and down directions by a line corresponding to the difference, and adjusting the vertical direction of the currently displayed analog and display screens. How to adjust the display screen size of the multi-converter output.