KR100195701B1 - The control apparatus of horizontal dynamic convergence - Google Patents

Abstract

The present invention relates to a horizontal dynamic convergence control apparatus of a display apparatus. The apparatus of the present invention comprises a horizontal parabola signal generator 20, a correction parabola signal generator 30, a horizontal switching signal generator 40, and a switching unit 50 to receive a flyback pulse from a horizontal output circuit. The dynamic convergence correction signal is generated and applied to the horizontal coil to correct the dynamic convergence. At this time, the horizontal parabola signal generator 20 generates a horizontal sawtooth wave using a horizontal flyback pulse, and generates a horizontal parabolic signal according to the horizontal sawtooth wave, and the corrected parabola signal issuing unit 30 generates the horizontal parabola signal. By varying the gain for, we generate various calibration parabolic signals. The horizontal switching signal generator 40 generates a horizontal switching signal for switching a part to be horizontally corrected according to the horizontal flyback pulse, and the switching unit 50 generates a horizontal deflection parabola signal partially corrected according to the switching signal. Output Therefore, the present invention can improve the convergence characteristics on a large screen by partially correcting the horizontal dynamic convergence correction signal.

Description

Horizontal Dynamic Convergence Control Unit

(A) of FIG. 1 is an illustration showing convergence correction, and (b) is a screen state when the color is out of convergence.

2 is an exemplary diagram showing a parabolic current flowing through each convergence coil.

3 is an exemplary diagram showing the shape of the horizontal convergence coil current and the vertical convergence coil current.

4 is a circuit diagram for generating a parabolic current for horizontal convergence.

(A) of FIG. 5 is a conventional horizontal convergence circuit diagram, and (b) is a horizontal deflection auxiliary circuit diagram and an S-shaped waveform diagram.

6 is a block diagram showing an apparatus for controlling horizontal dynamic convergence according to the present invention.

7 is a circuit diagram showing an embodiment of a horizontal parabola signal generator according to the present invention.

8 is a circuit diagram showing an embodiment of a horizontal switching signal generator according to the present invention.

9 is a block circuit diagram showing an embodiment of a correction parabola signal generator and a switch according to the present invention.

10 is a waveform diagram illustrating a process of partially correcting a horizontal parabola signal.

FIG. 11 is a wave for each point of the horizontal parabolic signal generator shown in FIG.

Brother.

FIG. 12 is a waveform diagram for each point of the correction parabola signal generator and the switch shown in FIG.

* Explanation of symbols for main parts of the drawings

20: Soup parabolic signal generator 22: Sawtooth wave generator

24: powering device 30: correction parabola generating unit

40: horizontal switching signal generator 42: sawtooth wave generator

44: switching signal generator 50: switching unit

52: first multiplexer 54: second multiplexer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal dynamic convergence control device, and more particularly, to a horizontal dynamic convergence control device that controls the convergence to be partially corrected to evenly deflect the left, right, and center of a large screen or a wide screen.

In general, convergence means that electron beams corresponding to red (R), green (G), and blue (B) are gathered together on a shadow mask to display a desired color.

(A) of FIG. 1 is an exemplary diagram showing convergence correction, and (b) of FIG. 1 shows a screen state diagram when the color is out of convergence without being converged.

As shown in (a) of FIG. 1, the electron beam from the electron gun (originally three electron beams but representing two electron beams for convenience of description) is in the same hole (point E of (a)) on the shadow mask. The electron beam from the focused, crossed, rust (G) electron gun touches the phosphor that emits green light, the electron beam from the red (R) gun touches the red phosphor, and the electron beam from the blue (B) gun shoots the blue phosphor. To reach each other.

However, when the electron beam is deflected, it is not concentrated on the shadow mask like the electron beam indicated by the solid line, but the closest distance from the deflection center point to the shadow mask (that is, from point A to point E shown in (a) of FIG. 1). Since the concentration is at the point D or F of the deflection radius arc whose radius is a radius, the adjacent phosphors fail to emit light and do not become false in color, as shown in FIG.

The reason for the color deviation without concentration as described above is because the positions of the electron guns are different and the distances from the deflection center point to the shadow mask surface (or the fluorescent surface) are different, as shown in FIG.

As shown in Fig. 1 (a), red (R) always tends to deviate to the right, green (G) to the left, and blue (B) to the bottom, which is relative to the position of the electron gun. Because each appears.

In order for the normal image to appear without any color deviation, as shown by the dotted line in (a) of FIG. 1, the deflection center point is properly opened so that the electron beam is concentrated at the d and f points, that is, B is b and C is c. It must be moved to correct the path of the electron beam.

Convergence includes Static Convergence and Dynamic Convergence, which is a permanent magnet embedded in a converged yoke that focuses the center of the screen. · Focusing the periphery of the screen by applying a moderate parabolic current to the vertical convergence coil.

Especially. Because dynamic convergence must be done periodically according to horizontal and vertical deflections, some of the horizontal and vertical deflection outputs are transformed into appropriate waveforms, which then flow through the conversion coil to concentrate on the periphery of the screen.

As shown in (a) of FIG. 1, as the deflection angle increases from the center of the screen, the concentration is shifted proportionally, and the tendency to shift according to horizontal and vertical deflection is different. Each must flow a suitable current.

2 is an exemplary diagram showing a parabolic current flowing through each convergence coil, (a) shows red (R) convergence coil current, and (b) shows green (G) convergence coil current.

Convergence is shown in FIG. Since it deviates in proportion to the distance between the shadow mask face and the deflection radius arc, it is necessary to compensate by flowing a parabolic current such as (a) or (b) which is proportional to the size of the shadow mask face and the deflection radius arc. do.

By the way, since the position of an electron gun differs in the above-mentioned parabola type electric current, the minimum point of the electric current which flows through an enemy convergence coil, and the electric current which flows through a rust convergence coil differs. Therefore, the path of the electron beam must be corrected by flowing a parabolic current through each convergent coil.

3 shows an example of the shape of the horizontal convergence coil current and the vertical convergence coil current. Although each current waveform is parabolic (parabolic), the magnitudes of the currents, that is, the amplitude (AMP) and the slope (TILT), are different. This is because the electron guns are arranged at a right angle and are out of the top, bottom, left, and right sides.

4 is a circuit diagram for generating a parabolic current for horizontal convergence, and a method of generating a parabola current based on the horizontal convergence circuit will be described.

(A) of FIG. 4 is a circuit diagram consisting of inductance only. Since a voltage proportional to the rate of change of current is always induced in the inductance L, a constant voltage of a constant magnitude (such as a sawtooth wave) flows through the circuit of the inductance L only. DC voltage) is applied, and as the current gradually increasing, such as parabolic current, the voltage is gradually increased, so that the sawtooth voltage appears at this time.

Therefore, if a sawtooth voltage is supplied to the circuit of the inductance L only, parabolic current flows between the syringes, and at the return time, the time constants of the resistance R and the inductance L are large (R is very small at T = L / R). Because the time constant T is very large, the current does not decrease rapidly, but decreases according to the decay time constant curve, so that when the sawtooth wave voltage is supplied to the circuit of the inductance L, a parabolic current flows.

(B) of FIG. 4 is a circuit diagram in which the inductance L2 is connected to both ends of the resistor R in FIG. 4A. When the inductance L2 is connected to the resistor R where the sawtooth voltage is applied, the sawtooth voltage is supplied. A parabola current flows through the inductance L2.

If the horizontal convergence coil is connected instead of the inductance L2, a parabola current flows through the horizontal convergence coil.

(C) of FIG. 4 is a circuit diagram in which the capacitor C1 is connected in parallel across the inductance L2 in (b), and the capacitor C1 is connected in parallel across the inductance L2 to resonate in parallel with the supply voltage frequency. In this case, since the vibration current also flows, the parabola current in the inductance L2 is superimposed on the parabola current and the curvature point is pushed to the opposite side. Since the resistor R shown in FIG. 4C acts as a damping resistance of the parallel resonant circuit, the vibration current is suppressed and is determined to be of an appropriate magnitude.

(D) 'a' waveform of FIG. 4 is a parabola current waveform flowing in inductance L2 when capacitor C1 is absent, and 'b' waveform is when capacitor C1 is connected and resonated in parallel to the supply voltage frequency. The waveform of the resonance current is a waveform of 'C' is a current flowing through the inductance (L2) is a combination of the a waveform and the b waveform.

(E) of FIG. 4 is a circuit diagram in which a capacitor C2 is connected in series to the inductance L1 of (c) and a diode D is connected in series to the resistor R. In this case, the diode D Since the rectified and charged (-) is charged to the capacitor (C2) is supplied to the inductance (L2), the parabolic current flows through the inductance (L2) of the minimum value is zero.

In FIG. 4 (f), 'a' is a circuit diagram in which the variable resistor R2 is connected in series with the capacitor C1 of the diagram (e). When the size of the bottom resistor R2 is adjusted, the magnitude of the vibration current is changed. The parabola current changes as shown in (f) 'b' or 'c' of FIG.

Therefore, since the resistance R2 is to change the inclination of the parabola current, the inclination TILT is adjusted. If the magnitude of the inductance L1 is changed, the magnitude of the voltage supplied to the inductance L2 is changed to increase the magnitude of the parabola current. As it changes, the amplitude (AMP) is adjusted.

(A) of FIG. 5 is a conventional horizontal convergence circuit diagram. When the RG-1 is adjusted, the currents of the red and green coils are equally increased and decreased, and when the RG-2 is adjusted, the red coil and the The current in the green (G) coil is reversed.

(For example, as the current increases on the R side, the G side decreases, and when the G side increases, the R side decreases. However, when placed in the middle position, the R and G sides are exactly the same.)

In addition, RG-3 changes the inclination of the red (R) and green (G) coil currents equally, and RG-4 reverses the inclination of the red (R) coil currents and the green (G) coil currents. .

(B) of FIG. 5 is a soug deflection auxiliary circuit diagram and an S-shaped waveform diagram, showing the principle of S-shaped correction, '10' is a deflection coil, '12' is an S-shaped correction capacitor, and '14' is a choke coil. '16' indicates a horizontal position adjusting unit.

When the current in the deflection coil 10 is a sawtooth wave accurately, both ends of the screen are excessively extended in the water pipe having a large deflection angle. Therefore, the S-shaped correction capacitor 12 is connected in series with the deflection coil 10 to correct the waveform by converting it into an S-shape.

However, in the case of the large screen or the wide screen (16: 9), only the correction by the S-shaped correction capacitor 12 as described above does not uniformly deflect the left, right or the center, which may cause deterioration in image quality. there was.

Accordingly, the present invention has been made to solve the above problems, and provides a horizontal dynamic convergence control device that controls the left, right, or center of the screen to be deflected constantly by correcting the horizontal parabola signal according to a necessary part. Its purpose is to.

The apparatus of the present invention for achieving the above object is to generate a dynamic convergence correction signal by using the horizontal flyback pulse generated in the horizontal output circuit and to apply to the horizontal coil to adjust the horizontal dynamic convergence A horizontal parabolic signal generator for generating a horizontal sawtooth wave by receiving the horizontal flyback pulse and generating a horizontal parabolic signal according to the sawtooth wave; A correction parabolic signal generator which receives the generated horizontal parabola signals and adjusts them differently to generate various correction parabola signals; A horizontal switching signal generator for generating a horizontal switching signal for switching portions to be differently corrected in the same horizontal period according to the horizontal flyback pulse; And a switching unit for outputting a horizontal dynamic convergence correction signal partially corrected by selecting an output of the correction parabola signal generator according to the horizontal switching signal.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention.

6 is a block diagram showing an apparatus for controlling horizontal dynamic convergence according to the present invention. The control device of the present invention comprises a horizontal parabolic signal generator 20 for generating a horizontal sawtooth wave using a horizontal flyback pulse and generating a horizontal parabolic signal according to the horizontal sawtooth wave; A correction parabola signal generator 30 generating a plurality of correction parabola signals by adjusting a gain of the generated horizontal parabola signal; A horizontal switching signal generator 40 generating a horizontal switching signal for switching a portion to be horizontally corrected according to the horizontal pullback pulses; And a switching section 50 such that the partially corrected horizontal deflection parabola signal is output by the horizontal switching signal.

7 is a circuit diagram illustrating an embodiment of a horizontal parabola signal generator according to the present invention. In FIG. 7, Q1 is a transistor (first transistor) serving as a switch for a + B drive of a horizontal flyback pulse (HFP), R1 and R2 are resistors for Q1 bias, R3 and R4 are load resistors, and C1 is sawtooth wave generation. The integral capacitor, A1 is a buffer, C2 is a DC coupling capacitor, and M is a multiplier (24: Multiplier).

Here, the horizontal parabolic signal generator 20 includes a sawtooth wave generator 22 for generating a sawtooth pulse by integrating a horizontal flyback pulse HFP; And a power generator 24 for generating a horizontal parabola signal proportional to the product of the sawtooth pulses generated.

In addition, the sawtooth wave generator 22 has two bias resistors R1 and R2 connected to the base of the transistor Q1 in common, and the horizontal flyback pulse HFP is connected to the other of the bias resistor R1. Is input, the other side of the bias resistor R2 is connected to ground, and the power supply (+ B) is supplied to the collector terminal of the first transistor Q1 to which the load resistor R3 is connected, and a buffer The collector terminal of the first transistor Q1 and the integrating capacitor C1 for generating a sawtooth wave are commonly connected to the non-inverting input terminal of (A1), and the inverting input terminal of the buffer A1 is connected to the output terminal of the buffer A1. The DC coupling capacitor C2 and the load resistor R4 are connected in series and parallel to the output terminal of the buffer A1.

The multiplier 24 in the present invention can be implemented by AD633 of Analog Devices.

8 is a circuit diagram showing an embodiment of a horizontal switching signal generator according to the present invention, wherein the horizontal switching signal generator 40 integrates a horizontal flyback pulse HFP to generate a sawtooth wave pulse 42. Wow; The switching signal generator 44 generates a pulse required for switching according to the generated sawtooth pulse.

Here, the sawtooth wave generator 42 of the horizontal switching signal generator 40 is the same as the element constituting the sawtooth wave generator 22 of the horizontal parabolic signal generator 20 shown in FIG. In the center of the switching signal generator 44 of the horizontal switching signal generator 40, A5 is a buffer, Q2 is a DC level shift transistor (second transistor), R7 and R10 are load resistors, and Q3 is a switching transistor. , R8 and R9 represent the bias resistor of Q3, E1 represents the switching level power supply.

In addition, the switching signal generator 44 has a sawtooth pulse input to the non-inverting input of the buffer A5, and an output of the buffer A5 connected to the base of the second transistor Q2 is input to the inverting input. A negative power supply (-B) is supplied to the collector terminal of the second transistor (Q2), a positive power supply (+ B) is supplied to an emitter to which a load resistor (R7) is connected, and an emi of the second transistor (Q2). One bias resistor (R8) and another bias resistor (R9) connected to the capacitor are connected to the base of the third transistor (Q3), and the switching level power source (E1) is connected to the emitter of the third transistor (Q3). The collector connected to the load resistor R10 is supplied with positive power (+ B) and has a final output terminal (HSWP).

9 is a block circuit diagram illustrating an embodiment of a correction parabola signal generation unit and a switching unit according to the present invention, wherein the correction parabola signal generation unit 30 receives the horizontal parabola signal to external resistors R _{A1 and} R _B1 . A first inverting amplifier A6 for generating a correction parabola signal whose gain is adjusted; The second inverting amplifier A7 receives the horizontal parabola signal and generates a correction parabola signal whose gain is adjusted by external resistors R _A2 and R _B2 .

In addition, the switching unit 50 selects one signal from among the parabolic signals HP1 and HP2 for correction and the uncorrected horizontal parabola signal HP by the horizontal switching signals HSWP1 and HSWP2. )Wow; A second multiplexer which selects one signal from the selected correction parabola signals HP1 and HP2 or the uncorrected horizontal parabola signal HP and outputs a partially corrected final parabola signal by the horizontal switching signal HSWPO; 54).

Next, the present invention configured as described above will be described in detail for the operation and effects.

10 is a waveform diagram illustrating a process of partially correcting a horizontal parabola signal, (a) a conventional horizontal parabola waveform, (b) a horizontal parabola waveform requiring correction, and (c) a horizontal parabola waveform for correction, (d ) Shows the horizontal switching signal waveform, and (e) shows the partially corrected horizontal parabola waveform.

Article 11 is a waveform diagram of each point of the horizontal parabola signal generating unit shown in FIG. 7, (a) is a horizontal flyback pulse coming into the input, (b) is a sawtooth pulse generated at point T, (d) This shows the waveform of the horizontal parabola signal generated at the output of the power supply.

FIG. 12 is a waveform diagram of each point of the parabolic signal generating unit and the switching unit shown in FIG. 9, (a) horizontal switching pulses (HSWP1, HSWP2, HSWPO), (b) a parabolic signal generating unit (b) 30 is a horizontal parabola signal (HP) waveform, (c) is the output (HP1.HP2) waveform of the correction parabola signal generator 30, (d) is the output (HPARA1, HPARA2) of the first multiplexer (52) ) Waveform, (e) shows the output waveform of the switching unit 50 partially corrected.

Referring to FIG. 7, the operation of the horizontal parabola signal generator 20 is performed. The horizontal flyback pulse (waveform: HFP in FIG. 11) generated by the horizontal output circuit (not shown) is a horizontal parabola. When input to the signal generator 20, the horizontal flyback pulse is integrated in the integral capacitor C1 of the sawtooth wave generator 22, and the sawtooth pulse is passed through the buffer A1 (waveform: T point in FIG. 11). Will occur. At this time, when the generated sawtooth pulse is input to the multiplier 24, a horizontal parabola signal (waveform (c) of FIG. 11) proportional to the product of two input signals is output.

Looking at the operation of the horizontal switching signal generator 40 with reference to FIG. 8, when the horizontal flyback pulse (waveform (HFP) of FIG. 11) enters the horizontal switching signal generator 40, a sawtooth wave is generated. The horizontal flyback pulse is integrated in the integrating capacitor C1 of the unit 42 to generate a sawtooth pulse (waveform (T) in FIG. 11) through the buffer A1. At this time, when the generated sawtooth wave is input to the switching generator 44, the final horizontal switching signal HSWP is output.

Referring to FIG. 9, the operation of the correction parabola signal generator 30 and the switching unit 50 will be described.

When the horizontal parabola signal is input to the correction parabola signal generator 30, the first inverting amplifier A6 outputs a correction parabola pulse whose gain is adjusted by the external resistors R _A1 and R _B1 ((c) of FIG. 12). HP1 waveform). That is, since the gain G of the first inverting amplifier A6 is G = − (R _B1 / R _A1 ), the closed loop gain G eventually depends on the external resistors R _A1 and R _B1 .

Similarly, the second inverting amplifier A7 outputs a correction parabola pulse whose gain is adjusted by the external resistors R _A2 and R _B2 ((c) HP2 waveform in FIG. 12). That is, since the gain G of the second inverting amplifier A7 is G = − (R _B2 / R _A2 ), the closed loop gain G eventually depends on the external resistors R _A2 and R _B2 .

Gain-adjusted correction parabola signals HP1 and HP2 which are output signals of the first and second inverting amplifiers A6 and A7 are respectively input to input terminals Y1A and Y1B of the first multiplexer 52 and horizontal parabola. When the signal ((b) HP waveform of FIG. 12) is input to the other input terminals (YOA, YOB) of the first multiplex 52, respectively, the signal from the horizontal switching signal generator 40 corresponding to the selection signal is received. The horizontal parabola signal or the correction parabola signal is selected and output from the first multiplexer 52 by the switching signal ((a) HSWP1 waveform and HSWP2 waveform in FIG. 12) ((d) HPARA1 waveform and HPARA2 waveform in FIG. 12).

When the signal selected by the first multiplexer 52 is input to the second multiplexer 54, the signal selected by the horizontal switching signal generator 40 corresponding to the selection signal is finally changed by the switching signal ((a) HSWP0 waveform of FIG. 12). A partially corrected parabola signal is output (Fig. 12 (e) HPO waveform).

As described above, according to the present invention, the horizontal parabola signals used for the horizontal dynamic convergence can be selected according to the switching signal to be partially corrected with different characteristics in the same horizontal period. Not only does it allow constant deflection, but it also has the effect of achieving even convergence, especially on large screens and wide screens.

Claims (5)

A display device configured to generate a dynamic convergence correction signal by using a horizontal flyback pulse generated from a horizontal output circuit and apply the horizontal convergence correction signal to a horizontal coil to receive a horizontal topback pulse. A horizontal parabolic signal generator 20 generating a horizontal parabolic signal according to the sawtooth wave; A correction parabolic signal generator 30 for receiving the generated horizontal parabola signal and adjusting gains differently to issue various correction parabola signals; A horizontal switching signal generator 40 generating a horizontal switching signal for switching portions to be differently corrected in the same horizontal period based on the horizontal flyback pulse; And a switching unit (50) which selects an output of the correction parabola signal generator in accordance with the horizontal switching signal and outputs a horizontal dynamic convergence correction signal partially corrected differently. A sawtooth wave generator (22) for generating a sawtooth wave pulse by integrating the horizontal flyback pulse; And a multiplier (24) for generating a horizontal parabola signal proportional to the product of the generated sawtooth pulses. 2. The sawtooth wave generator (42) according to claim 1, wherein the horizontal switching signal generator (40) comprises: a sawtooth wave generator (42) for integrating the horizontal flyback pulse to generate a sawtooth pulse; And a switching signal generator (44) for generating a pulse for switching according to the generated sawtooth pulse. The first inverting amplifier (A6) of claim 1, wherein the correcting parabola signal generator (30) receives the horizontal parabola signal and generates a correcting parabola signal whose gain is adjusted by external resistors (R _A1 , R _B1 ). )Wow; And a second half amplifier (A7) which receives the horizontal parabola signal and generates a correction parabola signal whose gain is adjusted by external resistors (R _A2 , R _B2 ). The switching device of claim 1, further comprising: a first multiplexer (52) for selecting one of a correction parabola signal and an uncorrected horizontal parabola signal by the horizontal switching signal; And a second multiplexer 54 which selects one signal from the selected correction parabola signal or an uncorrected horizontal parabola signal and outputs a horizontal dynamic convergence correction signal partially corrected differently. A horizontal dynamic convergence control device.