KR20020034385A - Method and apparatus for controlling screen of monitor - Google Patents

Abstract

PURPOSE: An apparatus and a method for controlling an image of a monitor are provided to adjust the center of an image by analyzing an input video signal and horizontal flyback signal. CONSTITUTION: An apparatus for controlling an image of a monitor includes a horizontal/vertical size and position controller(10), a horizontal controller(20), and a display. The horizontal/vertical size and location controller generates horizontal/vertical deflection control signals for controlling horizontal/vertical sizes and positions according to input horizontal/vertical synchronous signals and a horizontal flyback signal. The horizontal controller receives RGB video signals and the horizontal flyback signal to output a control signal for controlling a horizontal position to the horizontal/vertical size and location controller. The display displays the RGB video signals on a screen.

Description

Method and apparatus for controlling screen of monitor

The present invention relates to a monitor, and more particularly, to an apparatus and a method for adjusting a screen of a monitor.

In general, a monitor is a device that displays a video signal of a predetermined format transmitted from a video card of an associated PC on a screen through a series of signal processing such as digital sampling and scaling.

These monitors start with a small monitor using a cathode ray tube, and a large monitor using a flat panel display device such as an LCD is commercialized according to the trend of larger display devices with the development of modern technology.

Hereinafter, a screen adjusting apparatus of a monitor according to the prior art will be described with reference to the accompanying drawings.

1 is a block diagram showing an apparatus for adjusting a screen of a monitor according to the prior art.

As shown in FIG. 1, the apparatus for adjusting a screen of a monitor according to the related art includes an image amplifier 2 for amplifying input R, G, and B video signals to a predetermined level, and a horizontal / vertical sync signal to be input. A signal that can be displayed on the screen by receiving a horizontal / vertical magnitude and position controller 1 that outputs a horizontal / vertical deflection control signal, and an output of the image amplifier 2 and the horizontal / vertical magnitude and position controller 1. A CRT 4 for displaying an image signal output from the image processor 3 by a horizontal / vertical deflection control signal of the horizontal / vertical size and position control unit 1, Receives the vertical synchronization signal, the R, G, and B image signals, and the horizontal / vertical magnitude and the output Sd of the position control unit 1, and grasps the time relationship between the output time of the image signal and the deflection control signal. Outputting control signals according to A monitor for outputting a control signal to the horizontal / vertical size and position control unit 1 so that the screen is centered by varying the horizontal position and the vertical position according to the output from the plane adjustment unit 5 and the automation plane adjustment unit 5. It consists of the control part 6.

The operation of the screen adjustment device of the monitor configured as described above is as follows.

The image signal Sb is output from the image processing unit 3 in synchronization with the synchronization signal Sa output from the horizontal / vertical magnitude and position controller 1, and the horizontal / vertical magnitude and position controller 1 The video signal output from the image processor 3 is displayed on the CRT 4 by the vertical deflection control signal Sc and the horizontal deflection control signal Sd output from the.

In addition, since the distance between the inner curved surface of the CRT 4 and the electron emission point is not constant, the current of the deflection control signal is corrected (hereinafter referred to as S-shaped correction) to be deflected at a small angular velocity toward the edge of the screen. do. This degree of correction varies from frequency to frequency.

The automatic surface adjustment unit 5 uses the output of the vertical / horizontal position and size control unit 1 and the input of the synchronization signal and the input of the R, G, and B video signals to automatically adjust the size and position of the screen. The data relationship Sf is output to the monitor control section 6 after determining the time relationship between the output time and the deflection control signal.

The monitor control unit 6 adjusts the horizontal mode and the vertical position according to the input data Sf to center the screen, and adjusts the reference mode for each monitor to fit the screen size. And it adjusts constant size by grasping characteristics of adjustment value and screen size for each frequency band.

Here, the screen size depends on the time relationship between the deflection control output signal and the image signal output, the S-shape correction for each frequency, the deflection sensitivity of the deflection current of the CRT, and the error of various components related to the screen output. Experimental values by mode and measurement are used to automatically adjust the screen size.

As described above, the screen adjusting apparatus of the monitor according to the related art has the following problems.

First, a high manufacturing cost is required by implementing a separate automatic screen adjustment device.

Second, the implementation of the screen adjustment program using the information analyzed by the automatic screen adjustment device is complicated.

The present invention has been made to solve the above problems, and by adjusting the horizontal position of the image by comparing the input image signal and the horizontal flyback signal without implementing a separate automatic screen adjustment device to adjust the center of the image The purpose of the present invention is to provide an apparatus and method for adjusting a horizontal image center of a monitor.

1 is a view showing a screen adjustment apparatus of a monitor according to the prior art

2 is a view showing a screen adjustment apparatus of the monitor according to the present invention;

3 and 4 are waveform diagrams showing a change in an input signal of the monitor controller shown in FIG.

5 is a flowchart illustrating a screen adjusting method of a monitor according to the present invention.

Explanation of symbols for main parts of the drawings

10: horizontal / vertical size and position control unit 20: horizontal adjustment unit

21: image amplifier 22: stabilizer

23: NAND gate 24: monitor control unit

30: image processor 40: CRT

Horizontal center adjusting device of the monitor according to the present invention for achieving the above object is to output a horizontal / vertical deflection control signal and a horizontal flyback signal for controlling the horizontal and vertical size and position according to the input horizontal / vertical synchronization signal A horizontal / vertical size and position controller, and a horizontal adjuster that receives an input R / G / B image signal and the horizontal flyback signal and outputs an adjustment signal for adjusting a horizontal position to the horizontal / vertical size and position controller; And a display unit for processing the R / G / B image signal to be displayed on the screen according to the control signal output from the horizontal / vertical size and the position controller.

The horizontal center adjusting method of the monitor according to the present invention for achieving the above object is to move the horizontal position a predetermined step in the first setting direction when the flag for determining whether the interrupt is generated, and to determine whether or not the interrupt is generated after a predetermined time. Determining, if the interruption occurs, storing the first horizontal position control value; and if the first horizontal position control value is stored, initializing a flag for determining whether an interrupt has occurred, and then setting the second direction. Moving the horizontal position by a predetermined step, determining whether an interrupt has occurred after a predetermined time, storing the second horizontal position control value if the interrupt has occurred, and the first and second horizontal positions. And calculating and storing an average value of the control values. There is a gong.

Hereinafter, an apparatus and method for adjusting a horizontal center of a monitor according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a view showing a horizontal center adjustment apparatus of the monitor according to the invention, Figure 3 is a view showing a first embodiment of a horizontal center adjustment method of the monitor according to the invention, Figure 4 is a view of the monitor according to the invention 2 is a view showing a second embodiment of a horizontal center adjusting method, and FIG. 5 is a flowchart illustrating a horizontal center adjusting method of a monitor according to the present invention.

The horizontal center adjustment apparatus of the monitor according to the present invention outputs a horizontal / vertical deflection control signal and a horizontal flyback signal for controlling the horizontal / vertical size and position according to the horizontal / vertical synchronization signal input as shown in FIG. 2. The horizontal / vertical size and position control unit 10 and the horizontal / vertical size and position control unit 10 to receive an input R / G / B image signal and the horizontal flyback signal and to adjust a horizontal position. R, G, and B video signals output from the horizontal adjustment unit 20 in synchronization with the horizontal and vertical size and the synchronization signal output from the position control unit 10 on the screen The image processing unit 30 according to the image processing unit 30 for processing the displayable signal, the vertical deflection control signal Sc and the horizontal deflection control signal Sd output from the horizontal / vertical size and the position control unit 10. Exodus It consists of the video signal that is a CRT (40) for displaying.

The horizontal adjustment unit 20 is an image amplifier 21 for amplifying the input R, G, B image signal to a predetermined level, and each of the R, G, B image signals amplified by the image amplifier 21 NAND gate 23 for performing a NAND operation by receiving a stabilization unit 22 for stabilizing, an output signal of the stabilization unit 22, and a horizontal flyback signal output from the horizontal / vertical magnitude and position control unit 10. And a monitor controller 24 which receives the output of the NAND gate 23 as an interrupt signal, adjusts the horizontal center of the monitor, and outputs the horizontal / vertical size and the position control unit 10 to the horizontal control unit.

Here, the stabilizer 22 may include a first diode D1 for receiving the R image signal as an anode, a second diode D2 for receiving the G image signal as an anode, and a B image signal as an anode. The third diode D3 receives an input.

Referring to the operation of the horizontal center adjustment apparatus of the monitor according to the present invention configured as described above are as follows.

When the R, G, and B video signals are input to the video amplifier 21, the video amplifier 21 amplifies the video signal to a predetermined level, and amplifies the amplified R, G, B video signals to the first to Each of the third diodes D1, D2, and D3 is inputted to the anode, stabilized, and then output through a cathode. The cathodes of the first to third diodes D1, D2, and D3 are connected to one point. If any one of the outputs is high, the signal at the connection point is operated to output high.

The signal is input to the NAND gate 23, and another input of the NAND gate 23 is a horizontal flyback signal output from the horizontal / vertical magnitude and the position control unit 10.

Accordingly, the NAND gate 23 outputs a low signal only when both input signals are high, and the output of the NAND gate 23 is connected to the interrupt port of the monitor controller 24. Connected.

Herein, a change in an input signal input to the interrupt port of the monitor controller 24 will be described with reference to FIGS. 3 and 4.

As shown in FIG. 3, the video signal is fixed in synchronization with the input synchronization signal as shown in FIG. 3A, and the horizontal flyback signal used for deflection driving is shifted to the left as shown in FIG. 3B. In this case, as shown in (c) of FIG. 3, the video signal and the horizontal flyback signal are simultaneously high, and a low signal is input to the interrupt port of the monitor controller 24, and the input is high. When the signal is changed from a low signal to a low signal, an interrupt is generated in the monitor controller 24.

In addition, as shown in Figure 4, the video signal is fixed in synchronization with the input synchronization signal as shown in Figure 4 (a), the horizontal flyback signal used for the deflection drive to the right as shown in Figure 4 (b) When moving, as shown in (c) of FIG. 4, the video signal and the horizontal flyback signal are simultaneously high, and a low signal is input to the interrupt port of the monitor controller 24. When the signal is changed from a high signal to a low signal, an interrupt is generated in the monitor controller 24.

As such, when an interrupt occurs in the monitor controller 24, a program as shown in FIG. 5, which processes an input signal in the monitor controller 24, is driven.

Referring to FIG. 5, first, the horizontal position is initialized to an unchanged state in the input state so that the video signal is positioned between the horizontal flyback signals so that the two signals do not overlap and the horizontal position is determined to determine whether an interrupt is generated. Initialize the position and initialize the interrupt input flag to 0 (S1).

Then, the horizontal position is moved to the left by a predetermined step and waits for a predetermined time (S2 to S3).

After the predetermined time waits, it is determined whether an interrupt has occurred (S4).

Subsequently, when the interrupt occurs, the determination result S4 stores the first horizontal position control value in Hpos-left (S5).

Next, to find the horizontal position in the right direction, the horizontal position is initialized as before, and the interrupt input flag is initialized to 0 (S6).

Then, the horizontal position is moved to the right by a predetermined step and waits for a predetermined time (S7 to S8).

After waiting for the predetermined time, it is determined whether an interrupt has occurred (S9).

Subsequently, when the interrupt occurs, the determination result S9 stores the second horizontal position control value in Hpos-right (S10).

The average value of the first and second horizontal position control values is calculated (S11).

As described above, the apparatus and method for adjusting the horizontal center of the monitor according to the present invention receives the R, G, and B image signals and the horizontal flyback signal input to the interrupt port of the monitor controller, and adjusts the horizontal position of the image. The two signals are compared and analyzed to finally center the image.

As described above, the apparatus and method for adjusting the horizontal center of the monitor according to the present invention have the following effects.

First, the user's convenience can be maximized by comparing the image signal and the horizontal flyback signal to automatically center the image.

Second, productivity can be improved by horizontally positioning the video signal at the center automatically constantly.

Third, since the horizontal center can be adjusted in a manner without a separate device, the present invention can be implemented at a low cost.

Claims (7)

A horizontal / vertical magnitude and position control unit for outputting a horizontal / vertical deflection control signal and a horizontal flyback signal for controlling the horizontal / vertical magnitude and position according to the input horizontal / vertical synchronization signal; A horizontal adjusting unit which receives an input R / G / B image signal and the horizontal flyback signal and outputs an adjustment signal for adjusting a horizontal position to the horizontal / vertical size and position control unit; And, And a display unit configured to process an R / G / B image signal to be displayed on a screen according to a horizontal / vertical deflection control signal output from the horizontal / vertical size and position control unit. The method of claim 1, The horizontal adjustment unit An image amplifier for amplifying a predetermined level of the R / G / B image signal input; A stabilization unit for stabilizing each R / G / B image signal amplified by the image amplification unit; A NAND gate that receives an output of the stabilization unit and a horizontal flyback signal output from the horizontal / vertical size and position control unit and performs a NAND operation; And a monitor controller configured to receive a calculation result of the NAND gate as an interrupt signal and output a control signal for adjusting a horizontal position to the horizontal / vertical size and position controller. The method of claim 2, The stabilization unit A first diode which receives the R video signal as an anode; A second diode receiving the G image signal as an anode; And a third diode receiving the B image signal as an anode. The method of claim 3, wherein And cathodes of the first to third diodes are connected to each other. The method of claim 1, The display unit An image processing unit for processing the image signal amplified by the screen adjusting unit as a displayable signal on the screen according to the synchronization signal output from the horizontal / vertical size and the position control unit; And a CRT configured to display an image signal output from the image processor according to the horizontal / vertical deflection control signal output from the horizontal / vertical size and the position controller. Moving a horizontal position a predetermined step in a first setting direction when a flag for determining whether an interrupt is generated is determined and determining whether an interrupt has occurred after a predetermined time has elapsed; Storing a first horizontal position control value if an interrupt is generated as a result of the determination; Initializing a flag for determining whether an interrupt occurs when the first horizontal position control value is stored, and then moving the horizontal position a predetermined step in a second setting direction and determining whether an interrupt has occurred after a predetermined time elapses; Storing a second horizontal position control value if an interrupt is generated as a result of the determination; And, And calculating an average value of the first and second horizontal position control values. The method of claim 6, And the first and second directions are opposite to each other.