KR0145460B1 - Trapezoid compensating circuit of a monitor - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a geometric distortion correction circuit of a monitor, and more particularly to a trapezoid correction circuit of a monitor capable of compensating for a trapezoid generated on a screen when the vertical position is moved to the top or bottom of the screen. It is about.

As described above, the present invention relates to a monitor in which a trapezoid is corrected according to a vertical synchronization signal input by a pincushion correction unit and a vertical position located at the center of the screen, wherein the trappy generated by the vertical position moved to the upper and lower parts of the screen is Correction signal generation means for generating a trapezoid correction signal for correcting the zoids, and correction signal output control means for controlling the output of the trapezoid correction signal output from the correction signal generation means.

Description

Monitor's trapezoid correction circuit

1 is a view showing the configuration of a trapezoid compensator for a general monitor.

2 is a view showing the configuration of a trapezoid correction circuit of a monitor according to the present invention.

3 is a waveform diagram showing a signal output from each part of FIG.

* Explanation of symbols for the main parts of the drawings

10: pincushion correction unit 20: correction signal generator

21: integral part 22: differential part

30: correction signal output control unit 31-33: first control unit-third control unit

R2l-R22, R31-R33: Resistor C2l, C22, C3l: Capacitor

Q31, Q32: Transistor D3l: Diode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for compensating for geological distortion of a monitor, and in particular, a trapezoid correction circuit of a monitor capable of compensating for a trapezoid generated on a screen when the vertical position is moved to the top or bottom of the screen. It is about.

In general, in a monitor, the distortion generated on the screen in various forms such as center, trapezoid, parallel, corner, and balance is shown in FIG. The same is corrected by the pincushion correction unit 1.

Among the distortions generated as described above, the upper part of the screen is wider, the lower part is narrower, or the upper part of the screen is narrower, the lower part is wider. The horizontal signal at which the video signal is displayed is 48 KHz, and the vertical position located at the center of the screen. It is corrected by a parabolic correction signal output from the pincushion correction unit 1 operated according to the present invention.

In the monitor where the trapezoid is corrected by the pincushion correction device as described above, when the horizontal frequency is 48 KHz and the vertical position is located at the center of the screen, the trapezoid is corrected but the horizontal frequency is 48 KHz, and the vertical position is When moving to the upper part of the screen, the upper part of the screen is wider and the lower part is formed in a narrower trapidoid. When the vertical position is moved to the lower part of the screen, the upper part of the screen is narrower and the lower part is wider. A form of trapezoid is generated.

In addition, in the monitor standard set by the Video Electronic Standard Association (VESA), since the basic raster is considerably lowered to the lower part of the screen, the upper part of the screen becomes narrower, and then the vertical position is moved to the center. When the compensation of the trapezoid after the screen, the screen of the monitor having a different specification is distorted.

Accordingly, the present invention is to solve such a problem, an object of the present invention is the horizontal frequency of 48KHz, even when the vertical position is moved to the top or bottom of the trapezoid is corrected to increase the image quality of the monitor trapezoid It is to provide a compensation circuit.

Such an object of the present invention is generated by the vertical position moved to the upper and lower portions of the screen in the monitor that the trapezoid is corrected according to the parabolic line input by the pincushion correction unit and the vertical position located at the center of the screen. And a correction signal generating means for generating a trapezoid correction signal for correcting the trapezoid and a correction signal output control means for controlling the output of the trapezoid correction signal outputted from the correction signal generating means. It can be achieved by providing a trapezoid correction circuit.

Hereinafter, an embodiment of a trapezoid correction circuit of a monitor according to the present invention will be described in more detail with reference to the accompanying drawings.

2 is a view showing the configuration of a trapezoid correction circuit of a monitor according to the present invention. As shown in the drawing, a trappy generated on a screen when an input horizontal frequency is 48 KHz and a vertical position is located at the center of the screen. A pincushion correction unit 10 for outputting a parabola-shaped trapezoid correction signal for correcting the zoids, and a parabola type for correcting the trapezoid generated on the screen when the vertical position is moved to the upper or lower portion of the screen A correction signal generator 20 for outputting a trapezoid correction signal, and a correction signal output controller 30 for outputting a correction signal output from the correction signal generator 20 when the horizontal frequency input is 48 KHz. .

Here, the correction signal generator 20 integrates the vertical deflection signal A, which is input in the form of a sawtooth wave, to a value determined by the resistor R2l, the variable resistor VR2l, and the capacitor C2l ( 21 and a derivative 22 for differentiating the signal output from the integrating portion 21 and outputting a parabola-shaped correction signal C2. .

In addition, the correction signal output control unit 30 is composed of a resistor (R3l) and a transistor (Q31) by the control signal CON1 of the low potential state input when the input horizontal frequency according to the screen output method is 40KHz-50KHr The first control unit 31 for outputting the integral signal output from the integrating unit 21, and a resistor (R32), a capacitor (C3l) and a transistor (Q32) of a low potential state is input when the horizontal frequency is 48KHz A second control unit 32 for outputting a correction signal output from the derivative unit 22 by a control signal CON2, a resistor R33 and a diode D3l, which is input in the case of a D-Sub connector And a third control section 33 for outputting a correction signal output from the derivative section 22 by the control signal CON3 in the potential state.

In the trapezoid correction device of the monitor according to the present invention configured as described above, the horizontal frequency input at 48KHz and the voltage corresponding to the vertical position Vp located at the center of the screen are applied to the pincushion correction unit 10 so that the parabola is applied. The correction signal C1 of the form is output.

In addition, the trapezoid generated on the screen is corrected by the parabola type correction signal at the upper part and the lower part, or the upper part is narrow and the lower part is wide.

On the other hand, when the vertical position is moved upward or downward from the center of the screen, as shown in (A) of FIG. 3, the vertical deflection signal input in the form of sawtooth wave is a resistance (R2l) of the integrating portion 21, a variable resistor. The integrated signal as shown in (B) of FIG. 3 is output by integrating by the VR2l and the condenser C2l, and the integrated signal is transmitted by the resistor R22 and the condenser C22 of the derivative 22. Differentiated and shown in FIG. 3C, a parabolic correction signal C2 is output.

At this time, if the horizontal frequency input according to the corresponding method at the time of screen output is 40-50KHz, the control signal CON1 of the low potential state is output from the microprocessor not shown in the drawing, and the control signal CON1 of the low potential state The transistor Q31 is turned off by being applied to the transistor Q31 through the resistor R3l of the first control unit 31.

That is, the integrated signal output from the integration unit 21 of the correction signal generator 20 can be output as it is.

On the other hand, when the input horizontal frequency is 48KHz, the control signal CON2 in the low potential state is output from the microprocessor (not shown), and the control signal CON2 in the low potential state is supplied to the resistor R32 and the condenser C3l. After shaping, it is applied to transistor Q31 to turn transistor Q31 off.

That is, the correction signal C2 output from the derivative 22 of the correction signal generator 20 is output as it is.

In addition, when the input video signal is input to the D-Sub connector, a control signal CON3 having a low potential state is output from a microprocessor not shown in the drawing, and the control signal CON3 having a low potential state is a resistor R33. And after shaping by the diode D3l, the transistor Q31 is turned off by being applied to the transistor Q31 of the second control unit 32 through the capacitor C3l of the second control unit 32.

That is, the correction signal output from the derivative 22 of the correction signal generator 20 is output as it is.

On the other hand, if the horizontal frequency is not 40-50KHz, the control signal CON1 in the high potential state is output from the microprocessor (not shown), and the control signal CON1 in the high potential state is controlled by the first control unit 31. The transistor Q31 is turned on by being applied to the transistor Q31 through the resistor R3l.

The integrated signal output from the integration unit 21 of the correction signal generator 20 is muted to the turned-on transistor Q31.

In addition, if the input horizontal frequency is not 48KHz, the control signal CON2 in the high potential state is output from the microprocessor not shown in the drawing, and the removal signal CON2 in the high potential state is shaped by the resistor R32. Applied to transistor Q32, transistor Q32 is eventually turned on.

That is, the correction signal output from the derivative 22 of the correction signal generator 20 is muted by the turned-on transistor Q32.

In addition, when the input video signal is input to the BNC connector, a control signal CON3 in a high potential state is output from a microprocessor (not shown), and the control signal CON3 in a high potential state is a resistor R33 and a diode ( After shaping by D3l), the transistor Q32 is turned on by being applied to the transistor Q32 of the second control unit 32 through the capacitor C3l of the second control unit 32.

That is, the correction signal output from the differential unit 22 of the correction signal generator 20 is muted by the transistor Q32 of the second control unit 32.

As described above, the trapezoid correction circuit of the monitor according to the present invention includes a trapezoid correction signal output from the pincushion correction unit when the vertical position is located at the center of the screen and the horizontal frequency is 48 KHz, and the vertical position is displayed on the screen. When moved to the top or bottom of the trapezoid generated on the screen by the correction signal output from the correction signal generator is completely corrected has the effect that the image quality is increased.

Claims (3)

In a monitor in which a trapezoid is corrected according to a vertical sync signal input by a pincushion correction unit and a vertical position positioned at the center of the screen, correcting a trapezoid generated due to a vertical position moved up and down the screen. Correction signal generating means 20 for generating a trapezoidal correction signal for the correction signal output control means 30 for controlling the output of the trapezoidal correction signal output from the correction signal generating means 20 is further included Trapezoid correction circuit of the monitor, characterized in that. According to claim 1, The correction signal generating means 20 is an integral part 21 for outputting an integrated signal by integrating the vertical deflection signal (A) input in the form of sawtooth wave to a variable value, and the integral part ( 21. A trapezoid correction circuit for a monitor, characterized in that it comprises a derivative section 22 for differentiating a signal output from 21) and outputting a parabola type correction signal. 3. The correction signal output control means (30) according to claim 2, wherein the correction signal output control means (30) is output from the integrating portion (21) by a control signal (CON1) in a low potential state when the horizontal frequency input according to the screen output method is 40 to 50 KHz. A first control unit 31 for outputting an integrated signal and a correction signal output from the differential unit 22 by a control signal CON2 in a low potential state when the horizontal frequency input according to the screen output method is 48 KHz; The second control unit 32 and the third control unit 33 for outputting the correction signal output from the derivative unit 22 by the control signal CON3 of the low potential state input in the case of the D-Sub connector Trapezoid correction circuit of a monitor characterized by the above-mentioned.