KR20040072905A - A miss-convergence correction device of deflection yoke - Google Patents

Abstract

PURPOSE: A device for compensating for miss convergence of a DY(Deflection Yoke) is provided to additionally connect coma free coils to variable resistances and diode bridges connected with an YV(Y-axis vertical miss convergence) absolute compensator, thereby improving VCR(Vertical Center Raster) and YH(Y-axis horizontal miss convergence) features. CONSTITUTION: Two vertical deflection coils(VC1,VC2) are disposed on a magnetic input end in serial. The first and second resistances(R1,R2) are disposed on the two vertical deflection coils(VC1,VC2) in parallel. The first variable resistance(VR1) variably distributes size of a voltage applied on connecting points of the vertical deflection coils(VC1,VC2). Diode bridges(D1-D4) consist of 4 diodes connected to the connecting points in parallel. Two YV controlling variable resistances(YVA1,YVA2) are connected on both ends of the diode bridges(D1-D4) in parallel, and change self resistance values. Two coma free coils(CF D1,CF D2) are connected both ends of the diode bridges(D1-D4) in serial.

Description

Misconvergence correction device of deflection yoke {A MISS-CONVERGENCE CORRECTION DEVICE OF DEFLECTION YOKE}

The present invention relates to a device for correcting misconvergence of a deflection yoke, and more particularly, to a device for correcting misconvergence of deflection yoke (DY) generated in a cathode ray tube, the Y-axis vertical misconvergence. By connecting an additional coma free coil to the absolute amount correction part, the vertical center raster (VCR) misconvergence is widened and the Y-axis horizontal misconvergence (hereinafter referred to as "YV"). YH "), and the deflection yoke misconvergence correction device capable of changing the beam sigma.

In general, the deflection yoke DY refers to a device that deflects three electron beams to a predetermined place on a screen by applying a magnetic field to three electron beams R, G, and B emitted from an electron gun of a cathode ray tube.

Such a deflection yoke flows current through two coils arranged at right angles to the neck portion of the cathode ray tube to form a magnetic field, and deflects the electron beam by using the law of framing. That is, the deflection yoke deflects the three electron beams emitted from the electron gun installed in the neck portion of the cathode ray tube in the vertical and horizontal directions so as to collide with the correct position on the fluorescent surface of the cathode ray tube.

The deflection yoke has a horizontal deflection coil mounted to the left and right inner circumferential surfaces of the separator having a substantially trumpet shape, and a vertical deflection coil mounted to the left and right circumferential surfaces of the separator. Typically, a deflection yoke is installed inside a coil separator to generate a pincushion type magnetic field in a vertical direction, and a pair of horizontal deflection coils installed between a coil separator and a ferrite core to produce a barrel type magnetic field in a horizontal direction. It includes a pair of vertical deflection coils for generating a, and the horizontal deflection coils are subjected to a sawtooth current of 15.75 ㎑ to deflect the electron beam from side to side. In addition, the vertical deflection coil flows a sawtooth wave current of 60 mA to deflect the electron beam up and down. By combining these two coils, the electron beam is sequentially scanned from the upper left to the lower right on the screen.

At this time, when a current flows through the deflection yoke, a difference occurs in the left and right magnetic fields according to the relative distribution of the left and right vertical deflection coils or the magnitude of the relative amount of current, which causes misconvergence on the screen. In particular, as the size of the screen gradually increases and becomes flat, the influence of the misconvergence of the deflection yoke increases as the deflection angle increases toward the periphery of the screen.

Here, the misconvergence is roughly divided into YV misconvergence and YH misconvergence according to the axial direction. The YV misconvergence is divided into the X and Y axes, and the red beam R is formed on the upper and lower portions of the Y axis. The horizontal misconvergence refers to the vertical misconvergence shifted from the horizontal line of the blue beam B, and the YH misconvergence refers to the horizontal misconvergence of the vertical red beam R and the vertical blue beam B intersecting.

In addition, the type of such misconvergence may be subdivided into 1) landing error, 2) distortion error, and 3) VCR distortion. The characteristics of each type of misconvergence will be briefly described as follows.

First, the landing error refers to misconvergence in which three electron beams R, G, and B scanned from the electron gun are not accurately scanned at each pixel on the screen, and are scanned from each pixel to the center of the screen or to the edge of the screen. In other words, it means a misconvergence of a narrowed state or a widened state.

In addition, the distortion error is a state in which the three electron beams (R, G, B) is scanned on the screen is out of the upper and lower sides of the screen or the center of the screen is scanned and the electron beam is not scanned at the edge Refers to the misconvergence, and means the misconvergence of the barreled or pinned state.

Finally, the VCR distortion means that of the three electron beams (R, G, B), the red beam (R) and the blue beam (B) are accurately scanned on the screen, while the green beam (G) is accurately scanned on each pixel of the screen. In other words, it means misconvergence that error occurs in the vertical direction.

In other words, the YH is a misconvergence of the deflection yoke, the difference in the horizontal components of the red beam (R) and the blue beam (B) at the end of the Y axis of the screen, the VCR is a misconvergence of the deflection yoke, The difference between the vertical component of the red beam (R) and the blue beam (B) and the vertical component of the green beam (G) at the end of the Y axis.

Since the occurrence of the misconvergence is deeply related to the quality damage of the deflection yoke product, the producer should suppress this phenomenon as much as possible. There are various correction devices for correcting various misconvergences, and a comma-free coil is used as a representative method for correcting VCR distortion. The comapri coil has a VCR characteristic of the deflection yoke, that is, a misconvergence sensitivity of the center of the red beam (R) and the blue beam (B) and the vertical direction of the green beam (G) at a measurement point on the vertical axis of the cathode ray tube. Make it.

FIG. 1 is a block diagram illustrating a general deflection yoke misconvergence correction device. The misconvergence correction device includes a geometric distortion (G / D) correction unit (HTR) 1, an YV absolute amount correction unit (YVA) 2, and YH. The absolute amount correction unit YHA 3, the YH cross correction unit YHC 4, and the YV tilt correction unit YVT 5 are connected in series to each other to correct an input magnetic field. Here, the geometric distortion correction unit 1 and the YV absolute amount correction unit 2 are vertical coil main units, which will be described in detail later.

Meanwhile, FIG. 2 is a diagram for describing a general beam sigma. Referring to FIG. 2, the beam sigma refers to a state in which three electron beams R, G, and B are landing on the surface of the cathode ray tube. After the reference value is selected according to the characteristics of the difference between the red beam (R) and the blue beam (B) occurs, as shown, if the red beam (R) is to the left side compared to the blue beam (B) Grouping The opposite is called degroupization.

3 is a circuit configuration diagram according to the prior art for correcting the misconvergence characteristics of the deflection yoke, and the configuration of only the vertical coil main part is as follows.

The vertical coil main part consists of a vertical deflection coil, a resistor, a variable resistor and diodes. More specifically, in the first diode D1, first and second resistors R1 and R2 and the variable resistor VR1 are connected in parallel to two vertical deflection coils VC1 and VC2. Its anode (+) terminal is connected between R1) and variable resistor VR1; The second diode D2 has its cathode terminal connected to the cathode (−) terminal of the first diode D1 and its anode terminal has the second resistor R2 and the variable resistor VR1. Connected between; A third diode D3 has its cathode terminal connected between the first resistor R1 and the variable resistor VR1; The fourth diode D4 has its own anode terminal connected to the anode terminal of the third diode D3, and its cathode terminal is connected between the second resistor R2 and the variable resistor VR1. ; The second variable resistor VR2 is connected between the common cathode terminal of the first diode D1 and the second diode D2 and the common anode terminal of the third diode D3 and the fourth diode D4. The resistance value of the variable resistor VR1 changes in response to a signal in which the resistance value of the variable resistor VR1 varies.

The other configuration is a structure in which the YH absolute amount correction unit, the YH cross correction unit and the YV tilt correction unit are connected in series with the vertical coil main unit as described above, and a detailed description thereof will be omitted.

Therefore, the second variable resistor VR2 is provided at the center of the four diodes D1 to D4 forming the diode bridge as described above, and the current flowing through separate coils connected to the upper and lower sides (four-pole magnetic field). Is synchronized with the vertical coil to adjust the amount of current flowing up and down, which can correct the absolute amount of YV with the second variable resistor VR2.

By the way, when the above and below imbalance of the absolute amount of YV occurs, the adjustment is impossible using the second variable resistor VR2 which is a variable resistor.

4 is another circuit configuration diagram of the misconvergence correction apparatus of the deflection yoke according to the prior art, and when the above-described unbalance of the absolute amount of YV occurs, the second variable resistor VR2 becomes impossible to adjust. In order to solve this problem, it is additionally connected with individual variable resistors that individually adjust the absolute amount of YV on the bottom of the screen.

That is, the configuration of the misconvergence correcting device of the deflection yoke of FIG. Variable resistors YVA1 and YVA2 are added. Compared to FIG. 3, instead of the YV absolute amount corrector 10 of FIG. 3, the YV absolute amount corrector 20 is further included in the two variable resistors YVA1 and YVA2, thereby providing an upper YV and a lower YV. Will be adjusted individually.

By the way, in the above-described prior art, although the absolute amount of YV can be adjusted, the absolute amount of VCR and YH has a limit that can be adjusted using a deflection yoke vertical coil or other additives. In addition, in the conventional deflection yoke, there is a problem in that it is difficult to group beam sigma and the amount that can be adjusted is small.

SUMMARY OF THE INVENTION An object of the present invention for solving the above-described problems is to provide an apparatus for correcting misconvergence of a deflection yoke capable of improving an absolute amount of VCR and YH which are misconvergence of a deflection yoke.

Another object of the present invention is to provide an apparatus for correcting misconvergence of a deflection yoke capable of adjusting beam sigma.

1 is a block diagram of a general deflection yoke misconvergence correcting apparatus.

FIG. 2 is a diagram for explaining a general beam sigma state.

3 is a circuit configuration diagram of a misconvergence correction apparatus for a deflection yoke according to the prior art.

4 is another circuit configuration diagram of a misconvergence correction apparatus for a deflection yoke according to the prior art.

5 is a circuit configuration diagram of an apparatus for correcting misconvergence of a deflection yoke according to the present invention.

FIG. 6 is a detailed circuit diagram of the misconvergence correction apparatus of the deflection yoke illustrated in FIG. 5.

BRIEF DESCRIPTION OF THE DRAWINGS

30: YV absolute amount correction unit 31, 32: variable resistor for YV adjustment

33, 34: Comafree coil HTR: G / D correction unit

YVA: Y-axis vertical misconvergence correction unit

YHA: Y axis horizontal misconvergence correction unit

YHC: Y axis horizontal cross compensation unit YVT: Y axis vertical tilt compensation unit

As a means for achieving the above object, the apparatus for correcting misconvergence of the deflection yoke according to the present invention comprises: a) two vertical deflection coils arranged in series at the magnetic field input terminal; b) first and second resistors respectively disposed in parallel to the two vertical deflection coils; c) a first variable resistor connected in parallel to the connection points of the two vertical deflection coils to variably distribute the magnitude of the voltage across the connection points; d) a diode bridge consisting of four diodes connected in parallel to the connection points of the two vertical deflection coils; e) two YV adjustable resistors connected in parallel to both ends of the diode bridge, each of which has its own resistance value corresponding to a change in the resistance value of the first variable resistor; And f) two comafree coils connected in series at both ends of the diode bridge, wherein the comafree coils change the VCR misconvergence and the Y-axis horizontal misconvergence of the deflection yoke.

Here, the comafree coil is characterized in that the widening of the VCR misconvergence of the deflection yoke, the positive Y-axis horizontal misconvergence of the deflection yoke, and the beam sigma are changed.

The diode bridge may further include: a first diode having an anode terminal connected between the first resistor and the first variable resistor; Its cathode terminal is connected to the cathode terminal of the first diode and the anode terminal is a second diode connected between the second resistor and the first variable resistor; A third diode having a cathode terminal connected between the first resistor and the first variable resistor; And an anode terminal thereof is connected to an anode terminal of the third diode, and a cathode terminal includes a fourth diode connected between the second resistor and the first variable resistor.

In addition, the comma-free coil, a first coma-pre coil having one side connected to the anode of the first diode, the other side is connected between the two resistors; And a second comma-free coil having one side connected to the anode of the second diode and the other side connected between the two resistors.

Therefore, according to the present invention, by adding a comma-free coil to the existing YV absolute amount circuit to improve the misconvergence of the deflection yoke, the YH and VCR characteristics are improved, and the three electron beams R, G, and B Landings are grouped to improve beam sigma conditions.

Hereinafter, with reference to the accompanying drawings will be described the configuration and operation of the misconvergence correction apparatus of the deflection yoke according to the preferred embodiment of the present invention.

5 is a circuit configuration diagram of a misconvergence correction apparatus of a deflection yoke according to the present invention, and FIG. 6 is a detailed circuit configuration diagram of a misconvergence correction apparatus of a deflection yoke shown in FIG. 5.

The misconvergence correction apparatus for the deflection yoke according to the present invention is, as shown in FIG. 1, the geometric distortion correction unit HTR, the YV absolute amount correction unit YVA, the YH absolute amount correction unit YHA, the YH cross correction unit YHC. ) And a YV tilt correction unit (YVT), and are connected in series to each other to correct input magnetic fields.

Here, the geometric distortion correction unit and the YV absolute amount correction unit are vertical coil main units, which will be described in detail later. At this time, the resistances of the diodes D5 and D6, the resistors R3 and R4, the variable resistor VR3 and the comma-free coils CF B1 and CF B2 and the YH cross correction unit YHC of the YH absolute amount correction unit YHA. (R5), variable resistor (VR4) and comafree coils (CF A1, CF A2), resistance (R6), variable resistor (VR5) and comafree coils (CF C1, CF C2) of the YV tilt correction unit (YVT) And, since the description of the modulator (V) and the resistor (R7) is the same as the conventional configuration, detailed description thereof will be omitted.

5 and 6, in the misconvergence correction apparatus of the deflection yoke according to the present invention, the vertical coil main portion is first, two vertical deflection coils (VC1, VC2) are arranged in series with the magnetic field input terminal, First and second resistors R1 and R2 are disposed in parallel to the two vertical deflection coils VC1 and VC2, respectively.

In addition, the first variable resistor VR1 is connected in parallel to the connection points of the two vertical deflection coils VC1 and VC2 to variably distribute the magnitude of the voltage applied to the connection points.

In addition, the diode bridges D1, D2, D3, and D4 made of four diodes are connected in parallel to the connection points of the two vertical deflection coils VC1 and VC2. Here, the diode bridge (D1, D2, D3, D4), the first diode (D1) is connected to the anode terminal between the first resistor (R1) and the first variable resistor (VR1); Its cathode terminal is connected to the cathode terminal of the first diode (D1) and the anode terminal is a second diode (D2) connected between the second resistor (R2) and the first variable resistor (VR1); A third diode D3 having a cathode terminal connected between the first resistor R1 and the first variable resistor VR1; And an anode terminal thereof is connected to an anode terminal of the third diode D3, and a cathode terminal is a fourth diode D4 connected between the second resistor R2 and the first variable resistor VR1. Can be done.

In addition, two YV adjusting variable resistors YVA1 and YVA2 are connected in parallel to both ends of the diode bridges D1, D2, D3 and D4, respectively, to correspond to variations in the resistance value of the first variable resistor VR1. The resistance value of each is changed. At this time, the YV absolute amount may be corrected by using the existing YV variable resistor (not shown), and the YV absolute amount imbalance may be adjusted by using YV adjusting variable resistors referred to as YVA1 and YVA2. Will be corrected.

In addition, two comafree coils CF D1 and CF D2 are connected in series to both ends of the diode bridges D1, D2, D3 and D4, respectively, wherein the comafree coils CF D1 and CF D2 are deflected. It will change the yoke's vertical center raster (VCR) misconvergence and Y-axis horizontal misconvergence (YH).

Specifically, the coma-free coils CF D1 and CF D2 widen the VCR misconvergence of the deflection yoke, make the Y-axis horizontal misconvergence YH of the deflection yoke positive, and change the beam sigma. It is characterized by. Here, the comma-free coils CF D1 and CF D2 have a first comma-free coil having one side connected to an anode of the first diode D1 and the other side connected between the two resistors R1 and R2. (CF D1); And a second coma pre-coil CF D2 having one side connected to the anode of the second diode D2 and the other side connected between the two resistors R1 and R2.

In such a configuration, one side of the first coma free coil CF D1 is connected to the anode of the first diode D1, and the other side is connected between the two resistors R1 and R2, and the second coma Except that one side of the pre-coil (CF D2) is connected to the anode of the second diode (D2), the other side is connected between the two resistors (R1, R2), and the conventional configuration of FIG. Basically the same. That is, the YV absolute amount correcting unit 30 further includes two coma-free coils 33 and 34 among the vertical coil main parts, and the two YV adjusting resistors 31 and 32 include the diode bridges D1 and D2. , D3 and D4, respectively, are connected in parallel to each other, and two comapri coils 33 and 34 are connected in series to both ends of the diode bridges D1, D2, D3, and D4, respectively. Since the coils 33 and 34 can change the VCR misconvergence and the Y-axis horizontal misconvergence YH of the deflection yoke, the detailed description is omitted.

As a result, according to the present invention, by adding a comma-free coil to the existing YV absolute amount circuit, the YH and VCR characteristics are improved, and the landings of the three electron beams R, G, and B are grouped, thereby improving the beam sigma state. Will improve. As described above, the beam sigma refers to a state in which three electron beams (R, G, B) are landed on the surface of the cathode ray tube, and in the present invention, the red beams (R) are grouped to be located on the left side compared to the blue beam (B). Can be grouped.

While the invention has been shown and described in connection with specific embodiments thereof, it will be appreciated that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

As described above, by providing the misconvergence correction apparatus of the deflection yoke according to the present invention, it is possible to improve the VCR and YH characteristics, which are the misconvergence of the deflection yoke, and to easily adjust the beam sigma.

Claims (6)

a) two vertical deflection coils VC1 and VC2 arranged in series at the magnetic field input stage; b) first and second resistors R1 and R2 disposed in parallel to the two vertical deflection coils VC1 and VC2, respectively; c) a first variable resistor VR1 connected in parallel to the connection points of the two vertical deflection coils VC1 and VC2 to variably distribute the magnitude of the voltage applied to the connection points; d) a diode bridge (D1, D2, D3, D4) consisting of four diodes connected in parallel to the connection points of the two vertical deflection coils (VC1, VC2); e) two YVs connected in parallel to both ends of the diode bridges D1, D2, D3, and D4, each of which has its own resistance value corresponding to a change in the resistance value of the first variable resistor VR1; Adjustable resistors YVA1 and YVA2; And f) two comafree coils CF D1 and CF D2 connected in series to both ends of the diode bridges D1, D2, D3, and D4, respectively. Including; The comma-free coils CF D1 and CF D2 change the VCR misconvergence of the deflection yoke and the Y-axis horizontal misconvergence YH. The method of claim 1, The comma-free coils CF D1 and CF D2 widen the VCR misconvergence of the deflection yoke. The method of claim 1, The comma-free coils CF D1 and CF D2 add a positive (+) Y-axis horizontal misconvergence (YH) of the deflection yoke. The method of claim 1, The comma-free coils CF D1 and CF D2 change the beam sigma of the deflection yoke. The method of claim 1, The diode bridge (D1, D2, D3, D4), A first diode D1 having an anode terminal connected between the first resistor R1 and the first variable resistor VR1; Its cathode terminal is connected to the cathode terminal of the first diode (D1) and the anode terminal is a second diode (D2) connected between the second resistor (R2) and the first variable resistor (VR1); A third diode D3 having a cathode terminal connected between the first resistor R1 and the first variable resistor VR1; And Its anode terminal is connected to the anode terminal of the third diode D3 and the cathode terminal is connected between the second resistor R2 and the first variable resistor VR1. Misconvergence correction device of the deflection yoke comprising a. The method of claim 1, The coma free coils CF D1, CF D2, A first comapri coil CF D1 having one side connected to the anode of the first diode D1 and the other side connected between the two resistors R1 and R2; And A second comma-free coil CF D2 having one side connected to the anode of the second diode D2 and the other side connected between the two resistors R1 and R2. Misconvergence correction device of the deflection yoke comprising a.