KR100959119B1 - Apparatus for correcting for correcting mis-convergence of deflection york and display device using the apparatus - Google Patents

Abstract

The misconvergence correction device of the deflection yoke includes a first correction circuit and a second correction circuit connected in parallel to the vertical deflection coil, and the first correction circuit includes a first diode having a first end connected to the vertical deflection coil, And at least one first coil connected in series to a second end of the first diode, and at least one second coil connected in parallel to the first diode, wherein the second correction circuit comprises a first deflection coil; At least one third coil connected in series with the first stage, at least one third coil connected in series with the second stage of the second diode, and at least connected in parallel with the second diode; It includes one fourth coil.

Deflection yoke, YH misconvergence, coma correction coil, B-ing

Description

Misconvergence correction device of deflection yoke and display device using the same {APPARATUS FOR CORRECTING FOR CORRECTING MIS-CONVERGENCE OF DEFLECTION YORK AND DISPLAY DEVICE USING THE APPARATUS}

The present invention relates to a correction device for correcting misconvergence of a deflection yoke and a display device using the same, and more particularly, to a YH misconvergence correction device for correcting a Y-axis horizontal misconvergence.

In general, a three-color beam of red (R), green (G), and blue (B) that is scanned from an electron gun into a cathode ray tube (CRT) of a television or computer monitor is a fluorescent film coated on the screen of the cathode ray tube. A deflection yoke is used to deflect accurately. This deflection yoke is the most important element of the magnetic tube of the cathode ray tube, and serves to deflect the electron beam scanned from the electron gun so that the transmitted electric signal can be reproduced as an image on the screen of the cathode ray tube.

Since only the central phosphor of the screen emits light when the electron beam scanned from the electron gun goes straight onto the screen by a high voltage, the deflection yoke serves to deflect the electron beam from outside to reach the screen in scanning order. That is, the deflection yoke forms a magnetic field and accurately deflects the electron beam to the fluorescent film coated on the screen of the cathode ray tube using the change in the direction of propagation when the electron beam passes through the magnetic field.

In this case, when the deflected electron beam reaches a fluorescent film other than the fluorescent film to be reached, a problem may occur in which a convergence occurs on the screen. For example, Y-axis horizontal (hereinafter referred to as "YH") misconvergence may occur where the red and blue beams are displaced in the horizontal direction with the vertical axis (i.e., the Y-axis) interposed therebetween. have. In particular, a deflection amount of the red beam and the blue beam may vary depending on the position in the vertical direction, thereby causing a B-ing phenomenon in which the red beam and the blue beam cross each other in an “S” shape.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide an apparatus for correcting misconvergence of a deflection yoke capable of correcting YH misconvergence and / or B-ing characteristics and a display device using the same.

Misconversion correction device of the deflection yoke including the vertical deflection coil according to the characteristics of the present invention for achieving the above object includes a first correction circuit and a second correction circuit connected in parallel to the vertical deflection coil, The first correction circuit may include a first diode having a first end connected to the vertical deflection coil, at least one first coil connected in series with a second end of the first diode, and the first diode. At least one second coil connected in parallel, wherein the second correction circuit includes: a second diode having a first end connected to the vertical deflection coil and disposed in a reverse direction to the first diode; At least one third coil connected in series to a second end of the two diodes, and at least one fourth coil connected in parallel to the second diode.

According to another aspect of the present invention, a display device includes a cathode ray tube, an electron gun unit for emitting an electron beam, and a deflection yoke for transferring the electron beam emitted from the electron gun unit to the cathode ray tube, wherein the deflection yoke includes a vertical deflection coil; And a neck portion having first and second correction circuits connected in parallel to the vertical deflection coil, wherein the first correction circuit comprises: a first diode having a first end connected to the vertical deflection coil; At least one first coil connected in series to a second end of the first diode, and at least one second coil connected in parallel to the first diode, wherein the second correction circuit is configured to perform the vertical deflection. A first end is connected to the coil, the second diode disposed in a reverse direction to the first diode, connected in series to the second end of the second diode Is at least one third coil, and which includes at least one of the fourth coil is connected in parallel with the second diode.

Misconvergence correction apparatus for a deflection yoke including a vertical deflection coil according to another aspect of the present invention is a first diode having a first end connected to the vertical deflection coil, is connected in series to the second end of the first diode At least one first coil, a first end connected to the vertical deflection coil, at least one second coil connected in parallel to the first diode, and a first end connected to the vertical deflection coil. A second diode disposed in a reverse direction to the first diode, at least one third coil connected in series to a second end of the second diode, and a first end connected to the vertical deflection coil; And at least one fourth coil connected in parallel to the second diode, wherein the first coil and the third coil are connected in parallel.

As described above, according to the present invention, the YH misconvergence can be corrected by using the coil used in the YH misconvergence correction apparatus without adding a separate new coil, and the B-ing characteristic can be improved. Can be.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily practice the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

Hereinafter, a deflection yoke according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

1 is a view schematically showing a cathode ray tube display device according to an exemplary embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a deflection yoke according to an exemplary embodiment of the present invention, and FIG. 3 is a cross-sectional view of the deflection yoke of FIG. 2 taken along line III-III ′.

As shown in FIG. 1, the cathode ray tube display device includes a cathode ray tube 10, a deflection yoke 20, and an electron gun unit 30. The deflection yoke 20 is positioned between the cathode ray tube 10 and the electron gun portion 30, and the electron beam scanned from the electron gun 31 of the electron gun portion 30 collides with the correct position of the fluorescent film applied to the screen 11. Let's do it. The deflection yoke 20 includes a pair of coil separators 21 installed in up and down symmetry and coupled to each other. At this time, the coil separator 21 insulates the horizontal deflection coil 22 and the vertical deflection coil 23. In addition, the deflection yoke 20 extends integrally from the center surfaces of the screen portion 24, the recovery portion 25, and the recovery portion 25 coupled to the screen 11 side of the cathode ray tube 10 so that the cathode ray tube ( Neck portion 26 is coupled to the electron gun section 30 of 10).

Specifically, in the deflection yoke 20, the horizontal deflection coil 22 and the vertical deflection coil 23 are formed on the inner circumferential surface and the outer circumferential surface of the coil separator 21 to form a horizontal deflection magnetic field and a vertical deflection magnetic field by power applied from the outside, respectively. Is installed. At this time, a pair of ferrite cores 27 are mounted on the deflection yoke 20 to surround the vertical deflection coil 23, and are formed of a magnetic material so that the magnetic field generated in the vertical deflection coil 23 is strengthened.

When voltages of different frequencies are applied to the horizontal and vertical deflection coils 22 and 23, vertical magnetic force lines are generated in the horizontal deflection coil 22 by the Fleming's left-hand law, and the electron beam is deflected in the horizontal direction. A magnetic field line in the horizontal direction is generated at 23, and the electron beam is deflected in the vertical direction. Therefore, the red, green, and blue three-color electron beams emitted from the electron gun 31 are deflected at predetermined angles and impinge on the screen 11, respectively.

2 and 3, the deflection yoke 20, for example, the saddle-saddle type deflection yoke 20, is a saddle type that is installed on the inner circumferential surface of the conical coil separator 21. The saddle type vertical deflection coil 23 is provided on the outer circumferential surface of the horizontal deflection coil 22 and the coil separator 21.

Meanwhile, referring to FIG. 3, two horizontal deflection coils 22 are formed on the left and the right to generate magnetic lines in the vertical direction, and two horizontal deflection coils 22lu and 22ld formed on the left side are vertically disposed. The horizontal deflection coils 22ru and 22rd formed on the right side are also separated up and down. Two vertical deflection coils 23 are formed on the upper side and the lower side, respectively, in order to generate the magnetic lines in the horizontal direction. The two vertical deflection coils 23ul and 23ur formed on the upper side are separated from left and right, and are formed vertically. Deflection coils 23dl and 23dr are also separated from side to side.

A coma correction coil (not shown) is provided around the outer circumferential surface of the neck portion 26 of the coil separator 21 to correct the coma generated by the vertical deflection coil 23, and the coil separator 21 is provided. On one side of the recovery portion 25 of the) is a printed board (P) is installed to supply power to the horizontal and vertical deflection coils (22, 23) to control the electrical signal for the deflection yoke.

The electron beam emitted from the neck portion 26 has a different deflection trajectory due to the position of each electron gun in charge of red, green, and blue and the magnetic field generated in the deflection coil. As a result, misconvergence may occur on the screen. That is, three electron beams emitted from the electron gun must be focused and deflected in a certain direction and focused at one point of the shadow mask in the cathode ray tube. However, when the electron beam is deflected according to different deflection trajectories, since the electron beam reaches a phosphor other than the phosphor corresponding to the screen 11, a color error is generated and the red beam and the blue beam deviate from the green beam. This is called convergence.

YH misconvergence, a type of misconvergence, is a misconvergence in which a vertical line of a red beam and a vertical line of a blue beam cross each other, and a vertical line of a blue beam deviates from the upper and lower ends of the center of the screen based on the red beam.

In order to correct such misconvergence, the neck unit 26 includes a misconvergence correction device, and a misconvergence correction device according to the first and second embodiments of the present invention will be described with reference to FIGS. 4 to 7.

4 is a diagram illustrating a misconvergence correction apparatus according to a first embodiment of the present invention. FIG. 5 is a diagram illustrating YH misconvergence in the misconvergence correction apparatus shown in FIG. 4, and FIG. 6 is a diagram showing being (B-ing) in the misconvergence correction apparatus shown in FIG. 4.

As shown in FIG. 4, the misconvergence correction device 100 is connected to a vertical deflection coil 23 that generates a vertical deflection force with respect to the electron beam, and includes variable resistors YH_VR1 and YH_VR2 and diodes D1 and D2. , Coma correction coils L1, L2, L3, L4 and resistors R1, R2.

The first end of the variable resistor YH_VR1 and the first end of the variable resistor YH_VR2 are commonly connected to a contact J1 connected to the vertical deflection coil 23, and the second end of the variable resistor YH_VR1 is a diode ( It is connected to the anode terminal of D1), and the second end of the variable resistor YH_VR2 is connected to the cathode terminal of the diode D2. The two coma correction coils L1 and L2 are connected in series between the cathode terminal of the diode D1 and the contact J2, and the windings are wound in opposite directions. The two coma correction coils L3 and L4 are connected in series between the anode terminal of the diode D2 and the contact J2, and the windings are wound in opposite directions. That is, the coma correction coils L1 and L2 and the coma correction coils L3 and L4 are connected in parallel between the contact J1 and the contact J2. At this time, the two diodes (D1, D2) are formed in the opposite direction to each other, the diode (D1) forms a current path from the contact (J1) to the contact (J2), the diode (D2) is a contact (in contact J2) ( To form a current path to J1).

The first ends of the two resistors R1 and R2 are connected to a contact J1 connected to the vertical deflection coil 23, and the second end of the resistor R1 is connected to the diode D1 and the coma correction coil L1. It is connected to the contact J3, and the second end of the resistor R2 is connected to the contact J4 of the diode D2 and the coma correction coil L3.

At this time, the coma correction coils L1 and L2 correspond to the left and right sides of the vertical deflection coils 23ul and 23ur respectively formed on the upper side, and the coma correction coils L3 and L4 respectively form the vertical deflection coils 23dl and 23dr formed on the lower side. Correspond to the left and right sides of

In addition, the second end of the vertical deflection coil 23 and the contact J2 are connected to the printed circuit board P so that the current path or the contact J2 from the second end of the vertical deflection coil 23 to the contact J2 may occur. A current path to the second end of the vertical deflection coil 23 is formed.

When a current is applied to the vertical deflection coil 23 to generate a deflection magnetic field, the electron beam is deflected in the vertical direction. At this time, in the misconvergence correction device 100, scattering is generated on the horizontal and vertical deflection coils 22 and 23 provided on the inner and outer circumferential surfaces of the coil separator 21 to generate magnetic fields on both sides (left / right or up / down). As shown in FIG. 5, YH misconvergence between the red beam and the blue beam is generated.

When such YH misconvergence occurs, the coma correction coils L1 and L2 and the coma correction coils L3 and L4 are generated according to the direction and magnitude of the current flowing into the vertical deflection coil 23 and the magnitudes of the variable resistors YH_VR1 and YH_VR2. The intensity of the current flowing through) is controlled. Then, a magnetic force in a predetermined direction is generated according to the position of the core to which the coma correction coils L1 and L2 and the coma correction coils L3 and L4 are wound and the winding direction, so that the red beam and the blue beam receive electromagnetic force. YH misconvergence is compensated for by an angle deflection. That is, YH misconvergence is corrected by adjusting the resistance values of the variable resistors YH_VR1 and YH_VR2 so that a constant magnetic field is generated according to the flow of current relative to the coma correction coils L1 and L2 and the coma correction coils L3 and L4. can do.

However, in order to increase the amount of YH correction by increasing the size of the variable resistors YH_VR1 and YH_VR2 to correct YH misconvergence, as shown in FIG. There is a problem that B-ing occurs in the part.

Hereinafter, the misconvergence correction apparatus according to the second embodiment of the present invention will be described with reference to FIGS. 7 and 8 to solve the problem in which the B-ing occurs.

FIG. 7 is a diagram illustrating a misconvergence correction apparatus according to a second embodiment of the present invention, and FIG. 8 is a diagram illustrating a be-ing in the misconvergence correction apparatus shown in FIG. 7.

As shown in FIG. 7, the misconvergence correction apparatus 100 ′ according to the second embodiment of the present invention may have a coma correction coil L1 / L2 / L3 / L4 in the misconvergence correction apparatus 100 shown in FIG. 4. ) Are separated into two coma correction coils (L11 / L21 / L31 / L41 and L12 / L22 / L32 / L42).

The number of turns of the coma correction coil L1 shown in FIG. 4 is divided by a predetermined ratio to form the coma correction coils L11 and L12. Similarly, the number of turns of each of the coma correction coils L2, L3 and L4 is a predetermined ratio. They are divided to form coma correction coils L21 and L22, coma correction coils L31 and L32, and coma correction coils L41 and L42. Therefore, the overall inductance of the misconvergence correction apparatus 100, 100 'remains approximately the same.

The first ends of the two resistors R1 and R2 are connected to a contact J1 connected to the vertical deflection coil 23, and the two coma correction coils L12 and L22 are connected to the second end of the resistor R1 and the diode D1. ) Is connected to the contact J3 of the coma correction coil L11, and the two coma correction coils L32 and L42 are connected to the second stage of the resistor R2 and the contact point of the diode D2 and the coma correction coil L31. J4). That is, the resistor R1 and the coma correction coils L12 and L22 are connected in parallel with the diode D1, and the resistors R2 and the coma correction coils L32 and L42 are connected in parallel with the diode D2. have.

At this time, the coma correction coils L11 and L12 correspond to the left side 23ul of the vertical deflection coils formed on the upper side, and the coma correction coils L21 and L22 correspond to the right side 23ur of the vertical deflection coils formed on the upper side. The coma correction coils L31 and L32 correspond to the left side 23dl of the vertical deflection coils formed on the lower side, and the coma correction coils L41 and L42 correspond to the right side 23dr of the vertical deflection coils formed on the lower side.

When a current is applied to the vertical deflection coil 23 to generate a deflection magnetic field, the electron beam is deflected in the vertical direction. At this time, when the electron beam is deflected upward with respect to the horizontal axis which bisects the screen horizontally, current flows from the contact J1 through the misconvergence correction device 100 'to the contact J2. That is, the current path from the contact J1 through the diode D1 and the coma correction coils L11 and L21 in the direction of the contact J2, the resistance R1 and the coma correction coils L11 and L21 in the contact J1. A current path in the direction of the contact J2 via L12 and L22 and a current path in the direction of the contact J2 through the resistor R2 and the coma correction coils L32, L42, L31, and L41 at the contact J1. Is formed. At this time, the magnitude of the current flowing in the three current paths is determined by the impedance of the variable resistor (YH_VR1), resistors (R1, R2), coma correction coil (L11, L21, L12, L22, L31, L41, L32, L42). . Then, since the magnetic force generated through the coma correction coils L11 and L21 is greater than the magnetic force generated through the coma correction coils L31 and L41, the YH misconvergence generated at the upper portion of the screen is corrected, and the variable resistor YH_VR1 The total impedance of the misconvergence correction device 100 'is reduced by the coma correction coils L12, L22, L32, and L42 connected in parallel to YH_VR2 than the misconvergence correction device 100. B-ing occurring at the top of the can be reduced.

First embodiment Second embodiment Difference YH-B-ing (mm) Mw0.3 ㅁ 0.15 0.15 LV (mH) 13.8 13.8 0 RV (Ω) 8.4 7.8 0.6

Here, the YH-being (B-ing) is a difference between the maximum value and the minimum value at which the red and blue beams of the YH axis are displaced in the horizontal direction with the vertical axis (that is, the Y axis) interposed therebetween, and LV is the misconvergence. It is the total inductance formed by the correction device and the vertical deflection coil, and RV is the total impedance formed by the misconvergence correction device and the vertical deflection coil.

On the other hand, when the electron beam is deflected downward based on the horizontal axis which bisects the screen horizontally, current flows from the contact point J2 to the contact point J1 via the misconvergence correction device 100 '. That is, the current path from the contact point J2 through the coma correction coils L31 and L41 and the diode D2 toward the contact point J1, and the comma correction coils L31, L41, L32 and L42 at the contact point J2. A current path in the direction of the contact J1 and a current path in the direction of the contact J1 are formed through the coma correction coils L11, L21, L12, and L22 and the resistor R1 through the contact J2. At this time, the magnitude of the current flowing in the three current paths is determined by the impedance of the variable resistor (YH_VR2), resistors (R1, R2), coma correction coil (L11, L21, L12, L22, L31, L41, L32, L42). . Then, since the magnetic force generated through the coma correction coils L31 and L41 is greater than the magnetic force generated through the coma correction coils L11 and L21, the YH misconvergence generated at the bottom of the screen is corrected, and the variable resistances YH_VR1, Since the total impedance of the misconvergence correction device 100 'is reduced by the coma correction coils L12, L22, L32, and L42 connected in parallel to YH_VR2, the misconducting correction device 100' is reduced. (B-ing) phenomenon can be reduced.

When the electron beam is deflected to the upper or lower portion of the screen as described above, the YH misconvergence generated at the upper or lower portion of the screen may be corrected by using the magnetic force generated through the coma correction coils L11, L21, L31, and L41. The total impedance of the misconvergence correction device 100 'is reduced by the coma correction coils L12, L22, L32, and L42 than the misconvergence correction device 100. ing) phenomenon can be corrected.

Although the coma correction coils L12 and L22 according to the second embodiment of the present invention correspond to the left and right sides of the vertical deflection coils 23ul and 23ur formed on the upper side, the present invention is not limited thereto, and the lower side May correspond to the left and right sides of the vertical deflection coils 23dl and 23dr, respectively. In addition, although the coma correction coils L32 and L42 according to the second embodiment of the present invention correspond to the left and right sides of the vertical deflection coils 23dl and 23dr formed below, the present invention is not limited thereto. It may correspond to the left and right sides of the vertical deflection coils 23ul and 23ur formed on the upper side, respectively.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a view schematically illustrating a cathode ray tube display device according to an exemplary embodiment of the present invention.

2 is a view showing an example of a deflection yoke according to an embodiment of the present invention.

3 is a cross-sectional view taken along line III-III ′ of the deflection yoke illustrated in FIG. 2.

4 is a diagram illustrating a misconvergence correction apparatus according to a first embodiment of the present invention.

FIG. 5 is a diagram illustrating YH misconvergence in the misconvergence correcting apparatus shown in FIG. 4.

FIG. 6 is a diagram illustrating B-ing in the misconvergence correction apparatus shown in FIG. 4.

7 illustrates a misconvergence correction apparatus according to a second embodiment of the present invention.

FIG. 8 is a diagram illustrating B-ing in the misconvergence correction apparatus shown in FIG. 7.

Claims (17)

In the misconvergence correction apparatus of a deflection yoke including a vertical deflection coil, A first correction circuit and a second correction circuit connected in parallel to the vertical deflection coil; The first correction circuit, A first diode having a first end connected to the vertical deflection coil; At least one first coil connected in series with a second end of the first diode, and At least one second coil connected in parallel to the first diode, The second correction circuit, A second diode connected to the vertical deflection coil and disposed in a reverse direction to the first diode; At least one third coil connected in series with a second end of the second diode, and At least one fourth coil connected in parallel to the second diode, The first correction circuit further includes a first variable resistor connected in series with the first diode, The second correction circuit further includes a second variable resistor connected in series with the second diode. The method of claim 1, The first coil and the second coil is formed above the deflection yoke, And the third coil and the fourth coil are formed under the deflection yoke. The method of claim 1, The first coil and the fourth coil are formed above the deflection yoke, And the second coil and the third coil are formed under the deflection yoke. The method according to any one of claims 1 to 3, The first correction circuit further includes a first resistor connected in parallel to the first diode, The second coil is connected in series with the first resistor, The second correction circuit further includes a second resistor connected in parallel to the second diode, And the fourth coil is connected in series with the second resistor. delete The method according to any one of claims 1 to 3, First and second stages of the first diode are an anode and a cathode, respectively And a first end and a second end of the second diode are a cathode and an anode, respectively. The method according to any one of claims 1 to 3, The at least one first coil includes a first left coil and a first right coil which are connected to each other in series and are formed on the left and right sides of the deflection yoke, respectively. The at least one third coil is connected to each other in series, the misconvergence correction device including a third left coil and a third right coil formed on the left and right of the deflection yoke, respectively. The method of claim 7, wherein The at least one second coil includes a second left coil and a second right coil which are connected to each other in series and are formed on the left and right sides of the deflection yoke, respectively. The at least one fourth coil includes a fourth left coil and a fourth right coil which are connected in series with each other and are formed at left and right sides of the deflection yoke, respectively. Cathode ray tube, An electron gun that emits an electron beam, and A deflection yoke for transferring the electron beam emitted from the electron gun section to the cathode ray tube, The deflection yoke, Vertical deflection coil, and A neck portion having first and second correction circuits connected in parallel to the vertical deflection coil; The first correction circuit, A first diode having a first end connected to the vertical deflection coil; At least one first coil connected in series with a second end of the first diode, At least one second coil connected in parallel to the first diode, A first variable resistor connected in series with the first diode, and Further comprising a first resistor connected in parallel with the first diode, The second correction circuit, A second diode connected to the vertical deflection coil and disposed in a reverse direction to the first diode; At least one third coil connected in series with a second end of the second diode, At least one fourth coil connected in parallel to the second diode, A second variable resistor connected in series with the second diode, and Further comprising a second resistor connected in parallel with the second diode, And the second coil is connected in series with the first resistor, and the fourth coil is connected in series with the second resistor. 10. The method of claim 9, The first coil and the second coil is formed above the deflection yoke, And the third coil and the fourth coil are formed under the deflection yoke. 10. The method of claim 9, The first coil and the fourth coil are formed above the deflection yoke, And the second coil and the third coil are formed under the deflection yoke. delete In the misconvergence correction apparatus of a deflection yoke including a vertical deflection coil, A first diode having a first end connected to the vertical deflection coil; At least one first coil connected in series with a second end of the first diode, At least one second coil connected to the vertical deflection coil and connected in parallel to the first diode; A second diode having a first end connected to the vertical deflection coil and disposed in a reverse direction to the first diode; At least one third coil connected in series with a second end of the second diode, and A first end is connected to the vertical deflection coil, and includes at least one fourth coil connected in parallel to the second diode. And the first coil and the third coil are connected in parallel. The method of claim 13, A first variable resistor having a first end connected to the vertical deflection coil, and having a second end connected to the first end of the first diode, A first resistor connected to a first end of the first variable resistor and a second end connected to a first end of the second coil, A second variable resistor having a first end connected to the vertical deflection coil, a second end connected to a first end of the second diode, and And a second resistor having a first end connected to the first end of the second variable resistor and having a second end connected to the first end of the fourth coil. The method of claim 13, The first coil and the second coil is formed above the deflection yoke, And the third coil and the fourth coil are formed under the deflection yoke. The method of claim 13, The first coil and the fourth coil are formed above the deflection yoke, And the second coil and the third coil are formed under the deflection yoke. The method according to any one of claims 13 to 16, First and second stages of the first diode are an anode and a cathode, respectively And a first end and a second end of the second diode are a cathode and an anode, respectively.

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