KR20000055870A - method for adjusting screen size and screen location of image display apparatus - Google Patents

Abstract

PURPOSE: A justification of the screen size and position of an image display system is provided by recompensing the justification data of a screen size and position in order that the timing information regarding to a synchronizing signal and an image signal, that have been furnished from PC, may be appropriate to the character of the image display system. CONSTITUTION: A justification method of the screen size and position of the image display system contains the following steps: from the image display system having PC and micro controller unit, the first step to discriminate that the synchronizing signal correspond to the synchronizing signal having been discriminated previously through discriminating periodically that all the horizontal synchronizing signal and vertical synchronizing signal are input together from PC through micro controller unit; the second step to configure a display environment and a S curve correction so as to coincide to a frequency of existing input synchronizing signal in the case of the signal capable of a regular operation, and to maintain the screen with an off-state in the case of the signal incapable of the regular operation, by discriminating that the synchronizing signal is the signal capable of operating the image display system regularly; the third step to check whether the timing data input or not from PC, and to discriminate that the polarity of every frequency correspond to the input synchronizing signal; and the fourth step to output the justification data of the screen size and position from the third step, and to control the screen size and position according to the justification data.

Description

Method for adjusting screen size and screen location of image display apparatus}

The present invention relates to a method for adjusting a screen of an image display apparatus. In particular, the present invention relates to an image display apparatus suitable for compensating screen size and position adjustment data to suit the characteristics of the image display apparatus by receiving timing information on a synchronization signal and an image signal from a PC. It relates to a screen size and position adjustment method.

In general, the screen adjustment method of the video display device periodically checks the horizontal synchronous signal and the vertical synchronous signal inputted from the personal computer (PC) to the microcontroller unit (MCU) of the image display device, and changes the signal accordingly. The method of adjusting the size and position of the screen by controlling peripheral devices in the image display device or resetting the display environment is mainly used.

In the screen adjusting method of the image display apparatus, only the case where both the horizontal and vertical synchronizing signals are normally input and the frequency range thereof is also within the operating range of the image display apparatus will be described.

1 is a flowchart illustrating a screen size and position adjustment method of a conventional image display apparatus.

Referring to FIG. 1, the MCU of the image display apparatus periodically determines whether both the horizontal synchronous signal and the vertical synchronous signal are input from the PC by using a synchronization signal discrimination apparatus or a software program (S10).

Subsequently, when both the horizontal synchronizing signal and the vertical synchronizing signal are input, the MCU determines the frequency and polarity of the synchronizing signal (S11) to determine whether the current synchronizing signal is the same as the signal previously determined (S12).

If the synchronization signal currently input at the step S12 is the same as the signal previously determined, the currently set display environment is kept as it is. If the signal is different, the output of the display data on the screen is stopped and the image display device is muted on. (Screen off) (S14).

The MCU determines whether the next input synchronization signal is a signal capable of operating the video display device normally, and when the signal is normally operable, the S curve correction and other environment are set according to the frequency of the current input synchronization signal (S15). ), It will remain mute on when the signal is not normally operated.

Then, in order to set the S-curve correction and other environment, the MCU loads the default adjustment data corresponding to the frequency band of the synchronization signal from the memory and outputs the adjustment data to the screen adjustment apparatus (S17). When the screen size and position are adjusted according to the adjustment data and then muted off, the screen is turned on.

However, the screen size and position adjustment method of the conventional video display device, since the MCU sets or adjusts the horizontal size, position, vertical size and position of the screen in consideration of the frequency and polarity of the input sync signal, the frequency of the input sync signal. And even if the polarity is the same, if the input image signal and the timing information is different from each other there is a problem that the size and position of the screen changes.

Therefore, the present invention has been made to solve the disadvantages of the screen size and position adjustment method of the conventional video display device, the object of the present invention is to receive the timing information for the synchronization signal and the video signal from the PC of the image display device The present invention provides a method for adjusting the screen size and position of an image display device, by compensating screen size and position adjustment data so as to suit characteristics, so that a screen is always output in a desired size in the center.

1 is a flowchart illustrating a screen size and position adjustment method of a conventional image display apparatus.

2 is a flowchart illustrating a screen size and position adjustment method of an image display apparatus according to the present invention.

3A and 3B are waveform diagrams showing periods and widths of an image signal and a horizontal / vertical synchronization signal input from a PC;

4A and 4B are waveform diagrams showing periods and widths of an image signal and a horizontal / vertical synchronization signal measured by an image display device;

Explanation of symbols for main parts of the drawings

Thx, Tvx: Data input from PC

Shx, Svx: Reference measurement data provided in the image display device

Features of the screen size and position adjustment method of the image display device according to the present invention for achieving the above object is a PC for providing a horizontal and vertical synchronization signal, and screen size and position adjustment data in accordance with the horizontal and vertical synchronization signal In an image display device having an MCU for compensating and outputting, periodically determining whether both a horizontal sync signal and a vertical sync signal are input from a PC through the MCU to determine whether the sync signal matches a previously determined sync signal. In the first step, it is determined whether the synchronization signal is a signal capable of operating the image display device normally, and when the signal is normally operable, the S-curve correction and display environment is set according to the frequency of the current input synchronization signal. A second step of keeping the screen off when the signal is input; inputting timing data from the PC A third step of checking a negative part and determining whether the polarity of each frequency matches the input synchronization signal, and outputting the screen size and position adjustment data after the third step, and adjusting the screen size and position according to the adjustment data. It is composed of points.

Hereinafter, a preferred embodiment of a screen size and position adjustment method of an image display device according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a flowchart illustrating a screen size and position adjustment method of an image display apparatus according to the present invention.

Referring to FIG. 2, the MCU of the image display apparatus of the present invention periodically determines whether both the horizontal synchronous signal and the vertical synchronous signal are input from the PC by using a synchronization signal discrimination apparatus or a software program (S20).

Subsequently, when both the horizontal synchronizing signal and the vertical synchronizing signal are input, the MCU determines the frequency and polarity of the synchronizing signal (S21) to determine whether the current synchronizing signal is the same as the signal previously determined (S22).

If the synchronization signal currently input in step S22 is the same as the signal previously determined, the currently set display environment is maintained as it is. If the signal is different, the output of the display data on the screen is stopped and the image display device is muted on. (Screen off) (S24).

The MCU determines whether the next input synchronization signal is a signal capable of operating the video display device normally, and when the signal is normally operable, the S curve correction and other environment are set according to the frequency of the current input synchronization signal (S25). ), The mute on state is maintained when the signal is not normally operated.

Then, in order to set the S curve correction and other environment, the MCU loads default adjustment data corresponding to the frequency band of the synchronization signal from the memory (S26).

The MCU then determines whether timing data is input from the PC to check whether the timing data is supported by the PC (S27). If the timing data provided from the PC is input before outputting the screen adjustment data according to the determination result of the step S27, the MCU determines whether the frequency and polarity obtained using the data match the input synchronization signal frequency and polarity. (S28).

As shown in FIGS. 3A and 3B, timing data provided from a PC includes a period Th1 of a horizontal synchronization signal, a width Th2 of a horizontal synchronization signal, a vertical synchronization signal, and a video signal to compensate for the position and size of a screen. Time difference Th3, the width of the video signal Th4 with respect to the horizontal synchronization signal, the period Tv1 of the vertical synchronization signal, the width Tv2 of the vertical synchronization signal, and the time difference Tv3 between the vertical synchronization signal and the video signal. It consists of 10 pieces of data consisting of the width Tv4 of the video signal, the polarity Hpol of the horizontal synchronization signal, and the polarity Vpol of the vertical synchronization signal.

After the MCU loads the screen adjustment data from the memory, the horizontal frequency (1 / Th1) and vertical frequency (1 / Tv1) and the polarity (Hpol, Vpol) of each frequency are determined so that the polarity of each frequency is the input synchronization signal. If it is equal to, compares the timing data input from PC with the reference data and compensates the data by adjusting the horizontal / vertical size and position of the screen, and if it does not match, the previously loaded data is output as it is.

The following describes how the MCU compensates the horizontal / vertical size and position data using the timing data provided from the PC.

First, the data as shown in FIGS. 4A and 4B are obtained by measurement when the general sync signal and the video signal are input to the video display device to the desired horizontal / vertical size and the horizontal / vertical position.

The above measurement data includes the period (Sh1) of the horizontal synchronization signal (Sh1), the width of the horizontal synchronization signal (Sh2), the time difference (Sh3) between the vertical synchronization signal and the image signal, and the horizontal synchronization signal. The width of the video signal Sh4, the period of the vertical synchronization signal Sv1, the width of the vertical synchronization signal Sv2, the time difference between the vertical synchronization signal and the video signal Sv3, and the width of the video signal Sv4 with respect to the vertical synchronization signal. ), The time difference (Sh3) between the horizontal synchronization signal and the video signal.

Meanwhile, since the compensation method of the horizontal synchronization signal and the vertical synchronization signal are the same, a method of compensating adjustment data using the horizontal synchronization signal illustrated in FIGS. 3A and 4A will be described.

3A and 4A, in order to change the position of the screen, the time difference Th3 between the horizontal synchronization signal and the start point of the video signal may be changed. Therefore, in order to position the screen in the center, the image display shows the ratio (Th3 / Thf) of the time difference (Thf = Th1-Th2-Th3-Th4) between the time difference Th3 and the end point of the video signal and the horizontal synchronization signal following it. The ratio (Sh3 / Shf) of the time difference (Sh3) between the horizontal synchronization signal and the video signal, which is the reference data of the device, and the time difference between the end point of the video signal and the subsequent horizontal synchronization signal (Shf = Sh1-Sh2-Sh3-Sh4) ), The time difference Th3 between the horizontal synchronization signal and the video signal must be varied.

In the above formula, Th3 / Thf and Sh3 / Shf are constants, and if Sh3 / Shf is a constant k and the variable amount of time difference Th3 between the vertical synchronization signal and the video signal is defined as dT,

If sign Obtain

If sign Obtain

In this case, there is no need to compensate the adjustment value.

Then, the time change value obtained by Equations 1 and 2 If you define dHpos as an adjustable value, the compensated adjustment value for centering the screen is Hpos ± dHpos. This result compensates for the horizontal position and the vertical position is Vpos ± dVpos. Here, the "-" sign corresponds to Equation 1, and the "+" sign corresponds to Equation 2.

In order to adjust the size of the screen to a certain size, a time difference (dS) between the width Th4 of the video signal with respect to the horizontal sync signal of the timing data and the width Sh4 of the video signal with respect to the horizontal sync signal of the reference data is obtained. after If the adjustable value can be defined as dHsize, the dHsize for the reference screen size (Hsize) of the image display apparatus is added or subtracted.

That is, the compensated adjustment values for the horizontal size of the screen are Hsize ± dHsize, respectively, and the compensated adjustment values for the vertical size are Vsize ± dVsize.

After compensating the screen size and position adjustment data as described above (S29), the compensated adjustment data are output to the screen adjustment apparatus (S30). If the screen size and position are adjusted according to the compensated adjustment data and then muted off, the screen is turned on (S31).

As described in detail above, the screen size and position adjustment method of the image display device according to the present invention has the following effects.

First, the present invention can always output a screen in a desired size in the center by compensating screen size and position adjustment data to be suitable for the characteristics of an image display apparatus by receiving timing information about a synchronization signal and an image signal from a PC.

Second, the present invention can adjust the screen using only timing data provided from the PC without a separate hardware device for adjusting the size and position of the screen.

Third, the present invention has an advantage that it can be applied to any product by compensating and outputting screen size and position adjustment data according to whether timing information provided from a PC is supported.

Therefore, according to the screen size and position adjustment method of the image display device of the present invention, since the change of the adjustment method is expected according to the size and the standard of the product, the present invention is implemented within the scope not departing from the technical idea of the present invention. It is apparent that various modulation variations are possible without being limited to the examples.

Claims (9)

In a video display device having a PC for providing a horizontal and vertical synchronization signal, and a MCU for compensating and outputting screen size and position adjustment data according to the horizontal and vertical synchronization signal, A first step of periodically determining whether both a horizontal synchronous signal and a vertical synchronous signal are input from the PC through the MCU and determining whether the synchronous signal matches a previously determined synchronous signal; Determines whether the synchronization signal is a signal capable of operating the image display device normally, sets the S curve correction and display environment according to the frequency of the current input synchronization signal when the signal is normally operated, and displays the screen when the signal is not normally operated. The second step of keeping it off; A third step of checking whether the timing data is input from the PC and determining whether the polarity of each frequency coincides with an input synchronization signal; And a fourth step of adjusting the screen size and position according to the adjustment data by outputting the screen size and position adjustment data after the third step. The method of claim 1, wherein the frequency and the polarity of the synchronization signal are determined by the MCU when both the horizontal synchronization signal and the vertical synchronization signal are input in the first step. According to claim 1, If the current synchronization signal is the same signal as the signal previously determined in the second step is to maintain the currently set display environment, if the other signal stops the output of the display data on the screen How to adjust the screen size and position of the video display device, characterized in that off. 2. The screen size of an image display apparatus according to claim 1, wherein in the second step, default adjustment data corresponding to a frequency band of the synchronization signal is loaded from a memory in order to set S curve correction and other circumstances. And positioning method. 2. The screen size of an image display apparatus according to claim 1, further comprising a step of variably adjusting a time difference Th3 between a horizontal synchronization signal and a start point of an image signal in order to vary the position of the screen in the fourth step. And positioning method. 2. The ratio of the time difference Th3 to the video signal end point and the next synchronization signal (Thf = Th1-Th2-Th3-Th4) in order to position the screen to the center in the fourth step. (Th3 / Thf) is the time difference between the horizontal synchronization signal and the video signal (Sh3), which is the reference data of the video display device, and the time difference between the video signal end point and the next synchronization signal (Shf = Shf-Sh2-Sh3-Sh4). And variably adjusting a time difference (Th3) between the horizontal synchronization signal and the video signal to be equal to the ratio (Sh3 / Shf). 7. The method of claim 6, wherein in the variable adjusting step, when Th3 / Thf, Sh3 / Shf is a constant, Sh3 / Shf is a constant k, and the variable amount of the time difference Th3 between the vertical synchronization signal and the video signal is defined as dT, Amount (dT) If Satisfies the equation If Screen size and position adjustment method of the image display device, characterized in that to satisfy the equation. The method of claim 6, wherein the variable amount If dHpos and dVpos are defined as adjustable values, the horizontally compensated adjustment value for centering the screen is Hpos ± dHpos, and the vertically compensated adjustment value is Vpos ± dVpos. How to adjust screen size and position. 7. The screen size of an image display apparatus according to claim 6, wherein the compensated adjustment value for the horizontal size of the screen in the fourth step is Hsize ± dHsize, and the compensated adjustment value for the vertical size is Vsize ± dVsize. And positioning method.