KR100217993B1 - Circuit for correcting top and bottom distortion - Google Patents

Abstract

The present invention relates to a vertical distortion correction circuit for each mode, including: a parabola generator for generating a parabolic wave, a multivibrator for adjusting and outputting a duty pulse width of a horizontal pulse, and a duty width of the multivibrator being adjusted and outputting A multi-supply unit for applying a horizontal pulse and a parabolic wave output from the parabolic generator and synthesizing and outputting a correction current, and a gain of a correction current applied by applying a correction current output from the multi-supply unit. An amplification unit configured to amplify and a modulation unit configured to receive a correction current and a vertical pulse output from the amplifying unit and output a synthesized correction wave generated by superimposing the applied correction current and the vertical pulse, thereby generating an image generated on a display monitor screen. Lower wave distortion using multi-supply By combining the Rabola wave and the horizontal pulse to generate a correction current, it is possible to correct the up and down distortion of the display monitor screen generated in each video mode.

Description

Mode Up / Down Distortion Correction Circuit

The present invention relates to a vertical distortion correction circuit for each mode, and more particularly, to a vertical distortion correction circuit for modes for correcting vertical distortion generated for each image mode generated in a display monitor.

In general, a display monitor is a device that displays information on an image on a display screen among various peripheral devices that process information generated from a main device, that is, a personal computer (hereinafter, referred to as a PC) main body in a system device that handles information. Say. Such a display monitor is a convenient device that can display information generated in the PC main body most easily and quickly, and is the most common peripheral device always connected to the main device among the information system devices.

This general display monitor will be described with reference to the accompanying drawings.

1 is a block diagram showing an internal circuit of a monitor generally used. As shown in the drawing, the PC 100 receives a keyboard signal used by a user, processes the CPU signal, and generates data according to the processed result, and receives the data output from the CPU 110 and receives an image signal ( The horizontal synchronizing signal H-SYNC and the vertical synchronizing signal V- for processing the R, G and B and synchronizing the processed image signals R, G and B with the image signals R, G and B. The video card 120 outputs SYNC).

The monitor 200 receiving the image signals R, G, and B, the horizontal synchronizing signal H-SYNC, and the vertical synchronizing signal V-SYNC output from the video card 120 in the PC 100 is provided. The microcomputer 210 receiving the horizontal synchronizing signal H-SYNC and the vertical synchronizing signal V-SYNC, and a control button for generating a screen control signal for controlling the monitor screen and outputting the generated monitor screen control signal ( Button unit 220, horizontal and vertical output circuit unit 230 for synchronizing raster by receiving the monitor screen control signal and the reference oscillation signal output from the microcomputer 210, and the video card 120 A video circuit unit 240 for receiving and displaying an image signal output from the power supply unit; and a power supply circuit unit for supplying a driving voltage to the microcomputer 210, the horizontal and vertical output circuit units 230, and the image signal processor unit 240; 250).

Looking at each block in the monitor 200 having such a configuration in more detail as follows.

The horizontal synchronization signal H-SYNC and the vertical synchronization signal V-SYNC output from the video card 120 are received by the microcomputer 210. The microcomputer 210, which receives the horizontal synchronizing signal H-SYNC and the vertical synchronizing signal V-SYNC, incorporates various monitor screen control data. When the monitor screen control signal is applied from the control button unit 220 to the micom 210 as described above, the microcomputer 210 outputs an image adjustment signal for adjusting the image displayed on the monitor screen according to the applied screen control signal. Done.

The control button unit 220 outputs horizontal and vertical position control signals and horizontal and vertical size adjustment signals. The microcomputer 210 receiving the monitor screen control signal outputs a phase adjustment signal and a reference oscillation signal according to the applied monitor screen control signal.

The horizontal and vertical oscillation signal processors 230-1 receiving the phase adjustment signal and the reference oscillation signal output from the microcomputer 210 receive the horizontal synchronizing signal H-SYNC and the vertical synchronizing signal ( V-SYNC) controls the switching speed of the on / off operation of the sawtooth wave generating circuit.

The vertical pulses output from the horizontal and vertical oscillation signal processors 230-1 are applied by the vertical drive circuit 230-2. The vertical drive circuit 230-2, which receives the vertical oscillation signal, is generally used with one stage of vertical amplification type, and emitter follower (Emitter Folower) which inputs the base terminal of the transistor and extracts the output voltage from the emitter terminal. The mold is used a lot.

Therefore, the linearity improvement operation is performed rather than the gain. The vertical output circuit 230-3 receiving the current signal output from the vertical drive circuit 230-2 generates a sawtooth current corresponding to the vertical synchronizing pulse flowing through the V-DY 230-4. The vertical scan period is thus determined.

In addition, the horizontal oscillation signal output from the horizontal and vertical oscillation signal processor 230-1 is applied by the horizontal drive circuit 230-5. The horizontal oscillation signal is supplied to the horizontal drive circuit 230-5 to supply sufficient current to turn on / off the horizontal output circuit 230-6. The horizontal drive circuit 230-6 has an in-phase (dynamic polarity) method in which the output stage is turned on when the drive stage is turned on, and an inverted phase (reverse polarity) scheme in which the output stage is also turned off when the drive stage used in the current stage is on. have. As such, the horizontal output circuit 230-6 receiving the current output from the horizontal drive circuit 230-5 generates a sawtooth wave current in the H-DY 230-7. This sawtooth current determines the horizontal scanning period.

A flyback transformer (FBT) is used to supply a stable direct current (DC) voltage to an anode of a cathode ray tube (hereinafter referred to as a CRT) 240-3. 9) by using the return collector and using harmonics by the leakage inductance and the distribution capacity of the high voltage circuit 230-8, a large high voltage is generated even if the collector pulse is small, so that the anode terminal of the CRT 240-4 is used. High pressure is applied to (240-4-1).

As described above, a process of displaying an image signal on the CRT 240-4 in the image signal processor 240 that is applied with high voltage through the anode terminal 240-4-1 is as follows. The OSD unit 240-1 receiving the OSD gain signal generated by the screen control through the microcomputer 210 generates and outputs the OSD gain signal.

The video preamplifier 240-2 receiving the OSD gain signal output from the OSD unit 240-1 and the image signals R, G, and B applied from the video card 120 is a low voltage amplifier and has a low image signal. Amplifies (R, G, B) to maintain a constant voltage level. For instance, for example to amplify a signal of less than 1V _PP into a signal of 4 ~ 6V _PP. Thus, the video main amplifier 240-3 amplifies the signal of 4 to 6V _PP and amplifies the signal to 40 to 60V _PP to supply energy to each pixel. The video signal amplified by the video main amplifier 240-3 is applied to the cathode of the CRT 240-4 so that the video signals R, G, and B are displayed on the monitor screen.

As described above, the power supply circuit unit 250 for supplying a driving voltage for displaying the image signals R, G, and B through the monitor screen is inputted as an alternating current (hereinafter referred to as AC) input terminal 250-1 for receiving commercial AC. Input exchange through). The degaussing coil 250-2 receiving the alternating current output through the AC input terminal 250-1 restores the color bleeding state of the monitor screen to the original color due to the geomagnetic field or external conditions. To make it work.

When the AC is applied to the degaussing coil 250-2 for 2-8 seconds for this operation, the magnetic field formed in the shadow mask in the monitor is dispersed to restore the color bleeding state.

In addition, the direct current rectified through the rectifier 250-3 is applied to the switching transformer 250-4. The switching transformer 250-4 receiving direct current performs a switching operation to supply various driving voltages required in the monitor 200 through the voltage output terminal 250-5. At this time, if the vertical synchronization signal V-SYNC is not applied from the video card 120, the microcomputer 210 applies the suspend mode signal to the voltage regulator 250-6 to block the deflection voltage.

At this time, the pulse width modulation (PWM) unit 250-7 performs a square wave pulse on / off drive operation of the switching device, and the change in the pulse width increases and decreases the conduction time. It will stabilize the voltage. If the PWM 250-7 does not detect the horizontal synchronizing signal H-SYNC and the vertical synchronizing signal V-SYNC in the microcomputer 210, the microcomputer 21 applies the power off mode signal. . The PWM unit 250-7 receiving the power off mode signal is in a low level state to cut off the voltage supplied to the monitor 200. Therefore, the power consumed in the monitor 200 is saved.

Such a general display monitor includes an electron gun that emits an electron beam to be scanned on a screen, and the emitted electron beam is scanned laterally deflected on the screen, and an image is formed according to the concentration of the electron beam to be scanned. Since the electron beam is deflected by the electromagnetic field formed by the deflection coil, the deflection angle of the electron beam may be deformed when the electromagnetic field is affected by the disturbance.

An image displayed on such a general display monitor may represent an image modified by internal or external factors. This screen distortion phenomenon will be described with reference to the accompanying drawings.

2 is a diagram illustrating a screen distortion phenomenon occurring in a display monitor. As shown, FIG. 2A is a diagram illustrating side pin cushion distortion, in which an image displayed on a display monitor is concave by lengths a and b. 2B is a state diagram showing the up-down distortion phenomenon, and is concavely displayed by the lengths c and d in the up-and-down direction on the screen of the display monitor. to be. This distortion phenomenon is formed in such a way that the scanning of the electron beam is abnormally performed by the resistance value of the image tube itself in addition to the image rotation phenomenon caused by an external magnetic field so that the image is asymmetric in the horizontal or vertical direction, or is applied to a deflection coil. In the case where the current is excessively supplied, the image is not displayed in a rectangular shape but has an upper, lower, left and right unbalance, thereby causing a problem of displaying in a non-rectangular shape.

A conventional distortion phenomenon correction circuit for preventing such a distortion phenomenon will be described with reference to the accompanying drawings.

3 is a circuit diagram illustrating in detail the vertical circuit illustrated in FIG. 1. As shown, Fig. 3A is a circuit diagram showing an image distortion phenomenon correction circuit, in which a horizontal pulse is applied to a transformer T1 through a resistor R1. It is induced through the transformer T1 according to the horizontal pulse applied through the resistor R1.

In this way, the horizontal pulse induced through the transformer T1 and the vertical pulse applied from the vertical output circuit 230-3 are superimposed waveforms according to the period of the RC time constant of the integrator composed of the resistor R2 and the capacitor C1. Will occur.

As such, the superimposed waveform generated according to the RC time constant of the resistor R2 and the capacitor C1 is applied to the vertical deflection yoke V-DY 230-4 to suppress the up and down distortion generated on the display monitor screen. Will be corrected. That is, by adjusting the vertical deflection angle of the beam generated by the electron gun, the generated upper and lower distortion strings are corrected.

The waveform output to each output point of the conventional distortion phenomenon correction circuit is shown in Fig. 3B. 3B is a waveform diagram of each output point of the image distortion phenomenon correction circuit, and waveform (A) shows a horizontal pulse generated and output at the horizontal output terminal.

The waveform (B) is shown as a waveform output from the vertical output circuit 230-3, and the waveform (C) shows a waveform in which the waveform (B) and the waveform (A) overlap. In particular, the hatched area in waveform (C) indicates the corrected amount.

The conventional screen distortion correction circuit of the display monitor has a non-linearity in order to correct the up and down distortion of the image generated on the screen of the display monitor, so to provide a non-linear, that is, a secondary functional current must be provided. There is a difficulty, and there is also a problem in that it is used only in a single mode, that is, a single frequency, and the amount of correction is fixed.

Therefore, in order to solve the above-mentioned problems, the present invention adjusts the correction position by varying the integral amount of the horizontal output signal, adjusts the correction magnitude by variably amplifying the voltage of the position corrected signal, and then adjusts the corrected horizontal output signal. It is an object of the present invention to provide a correction circuit for correcting up and down distortion image by applying to a vertical deflection coil by overlapping a vertical output signal whose vertical period is variable according to the magnitude of a frequency applied by using a modulation unit. .

The present invention having the above object is a parabola generator for generating a parabolic wave, a multivibrator for adjusting the duty width of the horizontal pulse and outputting, a horizontal pulse output by adjusting the duty width in the multivibrator and the A multi-supply unit that receives and synthesizes a parabolic wave output from the parabolic generator and outputs a correction current, an amplification unit that amplifies the gain of the applied correction current by receiving the correction current output from the multi-supply unit; And a modulation unit configured to receive the correction current and the vertical pulse output from the amplifier and output a synthesized correction wave generated by superimposing the applied correction current and the vertical pulse.

1 is a block diagram of an internal circuit of a conventionally used monitor;

2 is a state diagram illustrating a screen distortion phenomenon occurring in a display monitor;

Figure 2A is a state diagram showing the side pin cushion (Side Pin Cushion) distortion phenomenon,

2B is a state diagram showing up and down distortion phenomenon;

3 is a circuit diagram showing in detail the vertical circuit shown in FIG.

3A is a circuit diagram showing an image distortion phenomenon correction circuit,

3B is a waveform diagram of each output point of the image distortion phenomenon correction circuit;

4 is a block diagram showing an up-and-down distortion correction circuit for each mode according to the present invention;

FIG. 5 is a waveform diagram illustrating waveforms of respective output points in FIG. 4; FIG.

6 is a graph illustrating a state of a waveform generated by a modulation unit;

FIG. 7 is a detailed circuit diagram of the parabolic generator shown in FIG. 4;

8 is a circuit diagram illustrating in detail the multivibrator illustrated in FIG. 4;

9 is a circuit diagram showing in detail the multi-supply unit shown in FIG.

FIG. 10 is a circuit diagram illustrating in detail the buffer and amplifier shown in FIG. 4;

FIG. 11 shows the modulation part and the vertical deflection yoke shown in FIG. 4 in detail.

Schematic,

12 is a state diagram of a display monitor screen showing up and down distortion;

12A is a top and bottom distortion caused in the corner portion of the display monitor screen

It is a state diagram correcting an image,

12B illustrates the upper and lower sides generated according to the change according to the change in the amplification factor of the screen amplifier.

It is a state diagram which correct | amends a distorted image.

Looking at the present invention having such features using the accompanying drawings as follows.

4 is a block diagram illustrating an up-down distortion correction circuit for each mode according to the present invention. As shown, the horizontal synchronizing signal H-SYNC and the vertical synchronizing signal V-SYNC applied from a PC (not shown) are applied and applied to the horizontal synchronizing signal H-SYNC and the vertical synchronizing signal V-SYNC. The microcomputer 10 determines a video mode according to the control mode, and outputs a mode-specific image control and adjustment signal, a reference oscillation signal, and a horizontal synchronization signal according to the applied horizontal synchronization signal H-SYNC and the vertical synchronization signal V-SYNC. ), A horizontal and vertical oscillation signal processor 15 receiving a reference oscillation signal output from the microcomputer 10 and outputting a vertical oscillation wave according to the applied reference oscillation signal, and the horizontal and vertical oscillation signal processor 15 A vertical output circuit 20 that receives a vertical oscillation wave output from the N-axis output wave and generates a vertical pulse according to the applied vertical oscillation wave, and generates a parabolic wave according to the applied vertical pulse. Parabol A digital-to-analog converter (Digital to Analog Converter) for receiving an image control and adjustment signal according to a video mode output from the micro-generator 10 and a digital signal, which is an applied screen control and adjustment signal, into an analog signal. Analog Converter (hereinafter abbreviated as DAC) 30 and a horizontal balance which is output from the DAC 30 by receiving a horizontal pulse according to a horizontal synchronizing signal H-SYNC output from the microcomputer 10. A multivibrator 35 for triggering according to the signal H-BALANCE to adjust the duty width of the horizontal pulse to output an adjustment pulse, an adjustment pulse output from the multivibrator 35, and the parabola generator 25. The multi-supply unit 40 and the multi-supply unit 40 for synthesizing and receiving a parabolic wave output from the multiplier wave and outputting a correction current. A buffer unit 45 for stabilizing a gain by stably outputting the output correction current, an amplification unit 50 for receiving a correction current output from the buffer unit 45 and amplifying a gain of the applied correction current; Modulation unit 55 for receiving a correction current output from the amplifier 50 and a vertical pulse applied from the vertical output circuit 20 and outputs a synthesized correction wave generated by superimposing the applied correction current and the vertical pulse. And a vertical deflection yoke 60 for correcting the vertical and horizontal distortions by receiving the composite correction wave output from the modulation unit 55 and correcting the vertical deflection angle of the electron beam.

In this configuration, the modulation unit 55 may include a first transformer 55-1 overlapping each other by receiving a correction current output from the amplifier 50 and a vertical pulse applied from the vertical output circuit 20. It is comprised by the 2nd transformer 55-2.

Looking at the operation according to such a configuration as follows.

The PC outputs a horizontal sync signal (H-SYNC) and a vertical sync signal (V-SYNC) to synchronize an image displayed on a display monitor screen. The output horizontal sync signal H-SYNC and the vertical sync signal H-SYNC are applied by the microcomputer 10 in the display monitor. The microcomputer 10 receiving the horizontal sync signal H-SYNC and the vertical sync signal V-SYNC detects the applied horizontal sync signal H-SYNC and the vertical sync signal V-SYNC to select the video mode. Will be determined.

That is, the mode of the video signal output from the PC is determined. When the mode of the video signal is determined as described above, the control signal and the screen adjustment signal according to the determined result, the horizontal sync signal H-SYNC and the vertical sync signal V-SYNC applied from the PC are output.

The microcomputer 10 generates a reference oscillation signal used as a reference of the oscillation signal. The generated reference oscillation signal is applied by the horizontal and vertical oscillation signal processor 15. The horizontal and vertical oscillation signal processor 15 receiving the reference oscillation signal outputs a vertical oscillation wave according to the applied reference oscillation signal. The vertical oscillation wave is applied by the vertical output circuit 20 and outputs a vertical pulse according to the applied vertical oscillation wave.

The parabolic generator 25 receives a vertical pulse according to the vertical flyback signal H-FLB. According to the applied vertical pulse, the parabolic generator 25 generates a parabolic wave according to the vertical period. In addition, the DAC 30 receives an adjustment signal of the monitor screen according to the video mode output from the microcomputer 10. The DAC 30 receiving the adjustment signal of the monitor screen converts the applied digital signal into an analog adjustment signal.

The horizontal pulse according to the horizontal synchronizing signal H-SYNC output from the microcomputer 10 is applied by the multivibrator 35. The multivibrator 35 receiving the horizontal pulse receives the horizontal balance signal H-BALANCE applied through the DAC 30 as a clock signal to adjust the duty width of the horizontal pulse. At this time, triggering is performed according to the RC time constant of an integrator (not shown) composed of a resistor and a capacitor in the multivibrator 35.

The horizontal pulse output by adjusting the duty width of the pulse from the multivibrator 35 and the parabolic wave output from the parabolic generator 25 are applied by the multi-supply unit 40. The multi supply unit 40 synthesizes the applied parabolic wave and the adjustment pulse. As described above, the multi-supply unit 40 outputs a correction current for correcting the up and down distortion occurring in the screen of the display monitor through the synthesis.

The buffer unit 45 is used to stably output the correction current output through the multi-supply unit 40. The buffer unit 45 allows the gain of the correction current obtained by combining the parabolic wave and the phase shifted horizontal pulse through the multi-supply unit 40 to be stably output without variation. The correction current output through the buffer unit 45 is amplified to a constant level through the amplifier unit 50. The correction current amplified by the amplifier 50 is applied to the modulation unit 55.

The modulation unit 55 receiving the correction current is applied to the first transformer 55-1 and the second transformer 55-2 which are made of EI cores, respectively. The first transformer 55-1 and the second transformer 55-2 that receive the correction current, respectively, are combined with the vertical pulses applied from the vertical output circuit 20. That is, the first transformer 55-1 and the second transformer 55-2 in the modulation unit 55 synthesize the vertical pulse and the correction current to convert the synthesized correction wave into the vertical deflection yoke 60. Will be authorized.

The vertical deflection yoke 60 receiving the composite correction wave adjusts the vertical deflection angle of the electron beam generated through an electron gun (not shown) according to the applied composite correction wave to display an image displayed on the screen of the display monitor. The up and down distortion of the image is corrected. That is, the vertical deflection angle increases as the electron beam moves from the left end to the center to correct the up and down distortion of the image displayed on the display monitor screen, and the vertical deflection angle decreases as it moves toward the right end beyond the center. .

In addition, in the first half of the vertical scan, the polarity increases in the negative direction and increases in the + direction in the second half, and the amplitude of the image is generated on the display monitor screen so that the beginning and end of the scan are maximum and minimum in the center. The distortion will be corrected. Therefore, by generating the composite correction wave in accordance with the video mode, the up-and-down distortion of the image generated at the frequencies according to various video modes is corrected.

The waveform of each output point of the image distortion phenomenon correction circuit will be described with reference to FIG. 5.

FIG. 5 is a waveform diagram illustrating a waveform of each output point in FIG. 4. Referring to the accompanying Figure 4 as follows. As shown in FIG. 5, the waveform W1 represents a vertical pulse, and the waveform W2 represents a parabolic wave generated according to the period of the vertical pulse through the parabolic generator 25. The waveform W3 shows the horizontal pulse, and the waveform W4 shows the pulse output by adjusting the width of the duty pulse of the horizontal pulse through the multivibrator 35.

The waveform W5 represents the correction current generated by combining the waveform W2 and the waveform W4 through the multi-supply unit 40. That is, the waveform according to the correction current generated by synthesizing the parabolic wave waveform W2 and the phase shifted horizontal pulse through the multi-supply unit 40 is shown. In addition, when the hatched portion is curved upward, the correction amount in the upward direction of the display monitor screen is shown. And when the curved part faces downward, the correction amount of the downward direction of a display monitor screen is shown.

As such, the waveform according to the correction current shown in the waveform W5 is superimposed on the vertical pulse through the modulation unit 55. Looking at the modulation unit 55 using the accompanying drawings as follows.

6 is a graph illustrating a state of a waveform generated by a modulation unit. As shown, the transverse direction of the graph shows the vertical period. In addition, the width of each curved surface represents a horizontal period. That is, the period T1 shows the vertical period, and the width of the hatched surface shows the horizontal period T2.

The inclination 1 shown in the graph represents the optimum operating point at which the image does not cause up and down distortion on the display monitor screen. The center line 2 representing the center of the inclination 1 represents the center of the display monitor screen. In addition, the correction amount 3 in the upward direction of the screen is shown on the basis of the center line 2 representing the center of the display monitor screen, which indicates that the upwardly opposite end is the maximum correction amount. The correction amount 4 in the downward direction of the screen indicates that the correction amount at the end of the downward direction is maximum.

As described above, each block for outputting the generated waveform to correct the distortion of each mode is described in detail as follows. First, a parabolic generator 25 generating a parabolic wave will be described with reference to the accompanying drawings.

FIG. 7 is a detailed circuit diagram of the parabola generator 25 shown in FIG. 4. As shown in the drawing, a transistor Q1 that receives a horizontal pulse signal and performs a switching operation according to the applied horizontal pulse signal and an output signal that receives an output signal according to the switching operation of the transistor Q1 are applied and are output. And op amps OP1, resistors R3 and R4, and capacitors C2 and C3.

Looking at the operation according to such a configuration as follows.

The vertical pulse according to the vertical flyback signal is applied to the base terminal of the transistor Q1 through the resistor R3 and the capacitor C2. The transistor Q1 receiving the vertical pulse switches and outputs a pulse according to the applied vertical pulse. The pulse output through the transistor Q1 charges and discharges the capacitor C3. The waveform according to the charging and discharging of the capacitor C3 is applied to the inverting terminal of the operational amplifier OP1 and the ground voltage is applied through the inverting terminal.

The operational amplifier OP1 receiving the waveform according to the charge / discharge of the capacitor C3 outputs a parabolic wave in comparison with the ground voltage. At this time, it is driven by the Vcc voltage (+ 12V) in the positive period, and driven by the V _EE voltage (-12V) in the negative period. In addition, a size adjustment signal is output through the resistor R4.

Meanwhile, the multivibrator 40 for modulating the amplitude by receiving a horizontal pulse will be described with reference to the accompanying drawings.

FIG. 8 is a circuit diagram illustrating in detail the multivibrator illustrated in FIG. 4. As shown, the multi-vibrator 40 in which the horizontal pulse is applied and the duty pulse of the pulse is adjusted according to the triggering signal according to the horizontal balance signal H-BALANCE to output the adjustment pulse. A vibrator IC 40-1, a transistor Q2 for receiving and amplifying an amplitude-adjusted control pulse output from the multi-vibrator IC 40-1, resistors R13 and R14 and capacitors C6 and C7. Consists of

Looking at the operation according to such a configuration as follows.

A horizontal pulse according to the horizontal synchronizing signal H-SYNC output from the microcomputer 10 (shown in FIG. 4) is applied to the input terminal B of the second multivibrator IC 40-1 in the multivibrator 40. . In addition, the input terminal A receives a driving voltage 5V. In this way, the multi-vibrator IC 40-1 receiving the driving voltage 5V and the phase shifted pulse receives the horizontal balance signal H-BALANCE through the terminal C. The resistor R13 and the capacitor ( Licensed through C7).

As such, the horizontal balance signal H-BALANCE applied through the resistor R13 and the capacitor C7 is converted into a sawtooth wave through the resistor R13 and the capacitor C7, thereby multiplying the multivibrator IC 40-1. Triggering In other words, the timing triggered according to the horizontal balance signal H-BALANCE according to the video mode is determined to determine the amplitude of the horizontal pulse applied from the microcomputer 10.

When the triggering timing Timing is determined for each video mode as described above, an adjustment pulse whose amplitude is adjusted for each mode is output through the output terminal Q of the multivibrator IC 40-1. The output adjustment pulse is applied to the base terminal of the transistor Q2 through the resistor R14. The transistor Q2 receiving the adjustment pulse switches according to the applied adjustment pulse to output the adjusted pulse. The capacitor C6 is used for smoothing.

The multi-supply unit 45 receiving the adjustment pulse output from the multivibrator 40 will now be described with reference to the accompanying drawings.

9 is a circuit diagram illustrating in detail the multi-supply unit illustrated in FIG. 4. As shown, a multi-supply IC that receives and overlaps a horizontal pulse applied from a multi-multi vibrator 35 (shown in FIG. 4) and a parabolic wave applied from a parabola generator 25 (shown in FIG. 4). (45-1), a plurality of resistors R15 to R27, capacitors C9 and C10, and coils L2.

Referring to the operation according to the configuration as follows.

First, the horizontal pulse outputted by adjusting the duty width in the multi-vibrator 35 is removed through the coil L2 to remove the noise, and then induced in the resistor R15 to be applied through the 9th pin. In addition, the parabolic wave applied from the parabolic generator 25 is matched through the resistor R16 and the capacitor C8, is induced in the resistor R17, and applied to the eighth pin.

As described above, the multi-supply IC 40-1 receiving the parabolic wave and the adjusting pulse through pins 8 and 9 synthesizes the applied parabolic wave and the adjusting pulse to pin 2. Through the correction current is output. That is, the multi-supply IC 40-1 receives a potential difference corresponding to the voltages (+12 V and −12 V) applied through the resistors R18 and R19, respectively, and distributes the voltages applied through the resistors R20 and R21. Done. The divided voltage is applied through pin 4.

In addition, a voltage (+ 12V) applied through the resistor R22 and the capacitor C9 is applied to pin 14 through the resistor R24. The ground potential is applied through pins 3 and 13 through resistor R26 and the voltage (+ 12V) is applied through pin 1. In addition, resistors R25 and R27 were connected to pins 5, 6, 10, and 11, respectively, and pin 12 was connected to ground through resistor R28. Capacitor C10 is used for smoothing.

As described above, the parabolic wave and the adjusting pulse are synthesized according to the potentials of the voltages (+ 12V and -12V) applied through the resistors R18 and R19 to correct the top and bottom of the display monitor screen. The correction current is output. This correction current is output through pin 2 of the multi-supply IC 40-1.

The buffer unit 45 for stably extracting the correction current output through the second pin of the multi-supply IC 40-1 will be described with reference to the accompanying drawings.

FIG. 10 is a detailed circuit diagram illustrating the buffer unit and the amplifier unit illustrated in FIG. 4. As illustrated, the buffer unit 45 for stabilizing the gain of the correction current applied from the multi-supply unit 40 (shown in FIG. 4) includes transistors Q4 and Q5 that receive and amplify the correction current, and a plurality of resistors. It consists of (R29-R35) and capacitor C11.

In addition, the amplifier 50 that receives the correction current output from the buffer unit 45 and amplifies the applied correction current is a transistor Q5 for receiving and amplifying the correction current, and is output from the transistor Q5. It consists of transistors Q6 and Q7 that receive and re-amplify the output signal, a plurality of resistors R36 to R43, a plurality of capacitors C12 to C14, and a plurality of diodes D1 to D4.

Referring to the operation according to the configuration as follows.

The buffer unit 45 that receives the correction current applied from the multi-supply unit 40 receives the applied correction current through the capacitor C11 to the base terminal of the transistor Q3. At this time, it is combined with the voltages (+ 12V, -12V) through the resistors R29 and R30 and applied through the resistor R31 according to the potential level of the applied correction current. In addition, a ground potential is applied to the base terminal of the transistor Q4 through the resistor R34, and a voltage (-12V) is connected through the resistor R35.

The transistors Q3 and Q4 that receive the correction current constitute a differential amplifier, and thus output the correction current stably. The correction current output through the transistors Q3 and Q4 constituting the differential amplifier is applied to the base end of the transistor Q5 in the amplifier 50. The transistor Q5 receiving the correction current amplifies the applied correction current to a predetermined level. The amplified correction current is applied to the base terminal of the transistor Q6 to be amplified and output again.

The driving voltage (+ 150V) for driving the transistors Q5 and Q6 is induced through the resistor R43 to drive the transistor Q7. At this time, the correction current amplified and output from the transistor Q6 is fed back through the diodes D1 and D2 and the resistor R40 to select only a frequency of a predetermined band through the peaking coil L3. It is applied to the base end of (Q7). In response to the correction current applied through the peaking coil L3, the transistor Q7 operates to stabilize the correction current output from the transistor Q6.

Meanwhile, the driving voltage applied to the diode D3 through the peaking coil L3 applies the driving voltage of the transistor Q5 through the resistor R41 and the diode D4. The amplified correction current output through the transistors Q5 and Q6 is output through the resistors R42 and C14 by removing the noise of the resistors R38 and R39 and the capacitor C12. The resistor R36 is used as an emitter resistor and the resistor R37 is used as a collector resistor.

The modulation unit 55 (shown in FIG. 4) and the vertical deflection yoke H-DY 60 receiving the output correction current will be described with reference to the accompanying drawings.

12 is a circuit diagram illustrating in detail the modulation part and the vertical deflection yoke shown in FIG. 4. As shown, the correction current output from the amplifier 50 and the vertical common signal V-COMMON are applied and synthesized to synthesize a synthesized correction wave with the first transformer 55-1 and the amplifier ( A second transformer 55-2 that receives a correction current and a vertical output signal outputted from 50), synthesizes the resultant, and outputs a synthesized correction wave; and the first transformer 55-1 and the second transformer 55-2. And a vertical deflection yoke (H-DY) 60, which receives the composite correction waves respectively outputted from the control panel, adjusts the deflection angle of the electron beam to prevent the up and down distortion of the image displayed on the display monitor screen.

Referring to the operation according to the configuration as follows.

First, the correction current output from the amplifier 50 is applied to pin 1 of the first transformer 55-1 in the modulation unit 55. Pin 8 receives the vertical Common signal (V-COMMON) and pin 4 is connected to ground. This first transformer 55-1 uses an EI core. As described above, the first transformer 55-1 receiving the correction current and the vertical common signal V-COMMON synthesizes the applied correction current and the vertical common signal V-COMMON to synthesize a synthesized correction wave. Will print

In addition, the second transformer 55-2 in the modulation unit 55 receives the correction current output from the amplifying unit 50 to the first pin. Pin 5 receives the vertical output signal and pin 4 is connected to ground. This second transformer 55-2 uses an EI core. As described above, the second transformer 55-2 receiving the correction current and the vertical output signal synthesizes the applied correction current and the vertical output signal to output the synthesized correction wave.

In this way, the overlapping waves respectively output from the first transformer 55-1 and the second transformer 55-2 are input to the input pins 1 and 3 of the vertical deflection yoke (H-DY) 60. The vertical deflection yoke (H-DY) 60, which receives the corrected superposition wave through the input pin 1 and the input pin 3, respectively, amplifies the applied correction superimposed wave to correct the up and down distortion occurring on the screen of the display monitor. Done. That is, the vertical deflection yoke H-DY 60 adjusts the deflection angle of the electron beam to correct the up and down distortion generated at the left and right edges of the display monitor screen, that is, the corner portion.

As described above, a screen for correcting up and down distortion generated in the display monitor will be described with reference to the accompanying drawings.

12 is a state diagram of a display monitor screen showing up and down distortion.

As shown, FIG. 12A shows images (f, f ') and (g, g') that are distorted up and down at the corners of a display monitor screen generated by shifting horizontal periods and overlapping vertical output signals. have. The generated up and down distortion phenomenon can be adjusted to a desired screen by freely adjusting the vertical period through the first multi-vibrator 35 (shown in FIG. 4).

In other words, it is possible to convert the distorted images f and f 'back to the distorted images g and g' as well as the normal images e and e '. 12B shows a distorted image (h, h ') displayed according to the up-and-down distortion caused by the change in the amplification factor of the amplifier 50 (shown in FIG. 4). The upper and lower distortion images h and h 'generated in this way are converted into normal images e and e' by varying the amplification ratio for each mode through the amplifying unit 50.

As described above, the present invention synthesizes a parabolic wave and a horizontal pulse using up and down distortion generated in the display monitor screen to generate a correction current to correct the up and down distortion of the display monitor screen generated in each video mode. There is an effect that can be corrected.

Claims (5)

A parabolic generator that receives a vertical pulse and generates a parabolic wave according to the applied vertical pulse, and a digital signal that is an applied screen control and adjustment signal by receiving an image control and adjustment signal according to a video mode output from the microcomputer. Is converted to an analog signal and triggered according to a horizontal balance signal (H-BALANCE) output from the DAC by receiving a horizontal pulse according to a horizontal sync signal (H-SYNC) output from the DAC. Multi-vibrator to output the horizontal pulse by adjusting the duty width of the horizontal pulse, and a horizontal pulse output by adjusting the duty width from the multi-vibrator and the parabolic wave output from the parabolic generator A multi supply unit for outputting a correction current, The multi supply unit A buffer unit for stabilizing a gain by stably outputting a correction current output from the buffer, an amplification unit for receiving a correction current output from the buffer unit and amplifying a gain of the applied correction current, and a correction current output from the amplifying unit And a modulator for outputting a composite correction wave generated by applying a vertical pulse and superimposing the applied correction current and a vertical pulse, and receiving a composite correction wave output from the modulation unit and correcting a vertical deflection angle of the electron beam. A vertical distortion correction circuit for each mode including a vertical deflection yoke for correcting distortion. The method of claim 1, The parabolic generator outputs a transistor Q1 that receives a horizontal pulse signal and performs a switching operation according to the applied horizontal pulse signal, and compares an output signal that is applied with an output signal according to the switching operation of the transistor Q1. An up-down distortion correction circuit for each mode, characterized in that it is an operational amplifier (OP1). The method of claim 1, The multivibrator is a multivibrator IC that generates a phase shifted pulse by receiving a horizontal pulse and a triggering signal according to a horizontal balance signal (H-BALANCE). Up and down distortion correction circuit for each mode. The method of claim 1, The multi-supply unit receives a phase shifted horizontal pulse applied from the multi-vibrator and a parabolic wave applied from the parabolic generator, and overlaps the applied control pulse and the parabolic wave. An up-down distortion correction circuit for each mode, characterized by an IC. The method of claim 1, The modulation unit receives a correction current output from the amplifier and a vertical common signal (V-COMMON) and combines the first transformer to output a synthesized correction wave, and the correction current output from the amplifier is perpendicular to the output. And a second transformer configured to receive and synthesize an output signal and to output a synthesized correction wave.