KR100451947B1 - Miss-Convergence correction device of deflection yoke - Google Patents

Abstract

The present invention relates to a miss convergence correction device of a deflection yoke. In particular, a resistor is connected in series to an upper comma-free coil in order to compensate for an error caused by an upper and lower adjustment imbalance during operation of a YH correction circuit. It is related with the misconvergence correction apparatus of the deflection yoke which equalizes the upper and lower resistance values.

Description

Miss-Convergence correction device of deflection yoke}

The present invention relates to a miss convergence correction device of a deflection yoke. In particular, a resistor is connected in series to an upper comma-free coil in order to compensate for an error caused by an upper and lower adjustment imbalance during operation of a YH correction circuit. It is related with the misconvergence correction apparatus of the deflection yoke which equalizes the upper and lower resistance values.

Generally, deflection yoke is a device for deflecting an electron beam emitted from an electron gun of a cathode ray tube. Coma Free is the VCR (Ver.Center Raster) characteristic of deflection yoke, ie the center of red (R) / blue (B) and green (G) vertical misalignments at the measuring point on the vertical axis of the cathode ray tube. It makes the convergence sensitivity good.

In addition, misconvergence in the deflection yoke is displayed on the screen due to landing error, distortion error, and VCR distortion. This landing error refers to a misconvergence in which the 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. (narrow) means misconvergence in a widened state.

In addition, the distortion error is a misconvergence in which the electron beams B, G, and R are scanned on the screen out of the upper and lower sides of the screen, or are driven to the center of the screen to prevent the beam from being scanned at the edges. It means the misconvergence of the barrelized or pinned state.

In addition, the VCR distortion is a misconvergence in which the red beam R and the blue beam B are accurately scanned on the screen, whereas the green beam G is not accurately scanned on each pixel of the screen, and an error occurs in the vertical direction.

1 is a circuit diagram of an apparatus for correcting misconvergence in such a conventional deflection yoke.

As shown therein, the first and second comaprial coils 51 and 52 are electrically connected to each other in series with respect to the vertical coil main part 10. The YHC misconvergence adjusting units R1 and YHC VR are connected in parallel to the first and second coma-free coils 51 and 52. The YHC misconverging adjusting units R1 and YHC VR are connected to the first and second coma. This is for adjusting the misconvergence on the screen by controlling the relative amount of current flowing through the pre-coils 51 and 52.

In addition, the third and fourth coma prim coils 53 and 54 are connected in parallel to the second coma prim coil 52, and a variable resistor (YH VR) for adjusting YH misconvergence is provided in the third and fourth comma prim coils 52 and 54. 4 are connected in parallel to the comma-free coils 53, 54.

The variable resistor (YH VR) for the YH misconvergence adjustment is to adjust the misconvergence (YH) of the screen by controlling the relative amount of current flowing through the third and fourth comma-free coils (53, 54).

In addition, the first and second diodes D1 and D2 are connected in reverse polarity to each other in parallel, and the YH variable resistor YH VR is connected to the cathode terminal of the first diode D1 and the anode terminal of the second diode D2. The second and third resistors R2 and R3 are connected in series and are connected to the YH variable resistor YH VR in parallel, and are connected to the second and third resistors R2 and R3. And a fourth resistor R4 connected to the connection points of the first and second diodes D1 and D2 and first and second coils (not given reference numbers) connected in parallel to the fourth resistor.

Therefore, the vertical deflection magnetic field is adjusted through the vertical coil main part 10, and the input voltage is input to the first and second coma prim coils 51 and 52.

Then, the YHC misconvergence adjusting units R1 and YHC VR adjust the misconvergence on the screen by controlling the relative amounts of current flowing through the first and second coma precoils 51 and 52.

In the conventional misconvergence correction device operating as described above, YH, which is a distortion phenomenon of a screen that is distorted as shown in FIG. Should be corrected.

In this case, YH correction is performed by adjusting the variable resistor referred to as YH VR in FIG. 1. When adjusting the YH correction variable resistor (YH VR), the upper and lower characteristic change amounts should be changed in the same manner. As shown in FIG. 3, the screen does not change proportionally, and as a result of the imbalance, unnecessary work is performed during production, affecting other characteristics during correction, and 'U, which is currently mainstream of the DY Comafree coil. 'This is a problem that occurs in common in the letter system, so it is urgent to improve it.

The conventional method for solving such a problem generates a reverse signal as shown in FIG. 4 by adjusting a variable resistor (variable resistor referred to as YHC VR in FIG. 1) provided to correct YHC distortion. The overall compensation is made according to the combination of FIGS. 2 and 4.

However, since this method is connected to the comapri coil connected to the YH variable resistor (YH VR), the amount of current flowing in the upper and lower comapricoils is adjusted according to the adjustment of the YH variable resistor (YH VR), and the YH on the screen is adjusted. The absolute amount of the component changes.

Thus, if the amount of correction of the YH variable resistor (YH VR) that performs this operation is unevenly adjusted, such a cycle of re-calibrating the YHC variable resistor (YHC VR) on the circuit is repeated.

An object of the present invention for solving the conventional problems as described above relates to the miss convergence correction device of the deflection yoke, in particular, the error caused by the up and down adjustment imbalance during operation of the YH correction circuit In order to compensate for this, a deflection yoke misconvergence correction device is provided to equalize the upper and lower resistance values by connecting a resistor to the upper comma-free coil in series.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a circuit diagram of a misconvergence correction apparatus for a general deflection yoke.

2 to 4 are screen examples illustrating the YH distortion phenomenon and the process for correcting the same.

5 is an exemplary test result for examining the cause of the YH distortion phenomenon.

6 is an exemplary configuration diagram of a misconvergence correction apparatus for a deflection yoke having a YH compensation function according to the present invention;

7 is an exemplary test result for explaining the effect of the misconvergence correction apparatus of the deflection yoke having the YH compensation function according to the present invention.

In order to achieve the above object, according to the present invention, the first and second coma free coil electrically connected in series with the vertical coil main unit; A YHC misconvergence adjustment unit connected in parallel to the first and second comaprider coils and controlling misconvergence on a screen by controlling a relative amount of current flowing through the first and second comaprider coils; First and second diodes connected in parallel with each other in reverse polarity, YH variable resistors connected in parallel between a cathode terminal of the first diode and an anode terminal of the second diode, and parallel to the second comma-free coil; The third and fourth comma-free coils connected in parallel to the YH variable resistors, the third and fourth resistors connected in series and connected in parallel to the YH variable resistors, and the connection points between the third and fourth resistors. First and second coils forming a double intermediate tap TAP of a vertical coil V COIL connected in series between an anode terminal of the first diode and a cathode terminal of the second diode; And a compensating resistor connected in series between the fourth coma prime coil and the YH variable resistor and equalizing resistance values of the upper and lower coma primaries to improve an imbalance generated during YH distortion correction.

The above object and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

First, the technical idea applied to the present invention will be briefly described. In general, an imbalance amount generated during correction due to YH distortion is referred to as YHC (YH CROSS), and the amount of YHC generated according to YH absolute amount during YH adjustment is attached. It is measured as shown in FIG.

Therefore, looking at the diagram shown in FIG. 5, it can be seen that the change in YH is larger than the lower side in accordance with the change in the absolute amount of YH, and the difference increases as the adjustment amount increases.

Therefore, it is conceived that the imbalance can be improved by equalizing the upper and lower resistance values by connecting the resistors in series to the upper comapri coil.

In the present invention, as shown in FIG. 6, the first and second comafree coils 51 and 52 are electrically connected to each other in series with respect to the vertical coil main part 10. The YHC misconvergence adjusting units R1 and YHC VR are connected in parallel to the first and second coma-free coils 51 and 52. The YHC misconverging adjusting units R1 and YHC VR are connected to the first and second coma. This is for adjusting the misconvergence on the screen by controlling the relative amount of current flowing through the pre-coils 51 and 52.

In addition, the third and fourth coma prim coils 53 and 54 are connected in parallel to the second coma prim coil 52, and a variable resistor (YH VR) for adjusting YH misconvergence is provided in the third and fourth comma prim coils 52 and 54. 4 are connected in parallel to the comma-free coils 53, 54.

The variable resistor (YH VR) for the YH misconvergence adjustment is to adjust the misconvergence (YH) of the screen by controlling the relative amount of current flowing through the third and fourth comma-free coils (53, 54).

In this case, a compensation resistor (PR) for improving the imbalance is installed in series with the upper comapri coil referred to by reference numeral 54.

In addition, the first and second diodes D1 and D2 are connected in reverse polarity to each other in parallel, and the YH variable resistor YH VR is connected to the cathode terminal of the first diode D1 and the anode terminal of the second diode D2. The second and third resistors R2 and R3 are connected in series and are connected to the YH variable resistor YH VR in parallel, and are connected to the second and third resistors R2 and R3. And a fourth resistor R4 connected to the connection points of the first and second diodes D1 and D2 and first and second coils (not given reference numbers) connected in parallel to the fourth resistor.

Therefore, the vertical deflection magnetic field is adjusted through the vertical coil main part 10, and the input voltage is input to the first and second coma prim coils 51 and 52.

Then, the YHC misconvergence adjusting units R1 and YHC VR control the relative amount of current flowing through the first and second coma precoils 51 and 52 to adjust the YHC misconvergence on the screen.

Then, the variable resistance (YH VR) for YH misconvergence adjustment is the amount of current flowing through the fourth coma pre coil 54 and the compensation resistor (PR) connected in series with the amount of current flowing through the third coma pre coil 53. The control adjusts the misconvergence (YH) of the screen.

In this case, the resistance value of the compensation resistor PR should be set to 0.7 Ω, because the comapri coil used in the DY is configured up and down. In this configuration, the PCB and the terminal are located on the upper side, so that the difference in length occurs on the upper and lower sides during wiring. When the upper and lower terminals are configured with the same length of the upper and lower terminals of the comafree coil wound with the same number of windings When tested by the same review method that was examined when adjusting the existing YH volume (VOLUME) it can be seen that the distortion does not occur as shown in the accompanying FIG.

As in the above method, if the resistance element is connected as much as the difference between the resistance value of the lower C / F coil and the resistance of the upper comapri coil, the resistance difference between the upper and lower comaprile coil becomes '0' and the resistance value is unbalanced. This is in equilibrium.

Although preferred embodiments of the present invention have been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, by providing a Miss Convergence correction apparatus according to the present invention by equalizing the resistance of the upper and lower sides by connecting a resistor in series to the upper comma free coil, the upper and lower adjustments during the operation of the YH correction circuit It can compensate for the error caused by the imbalance.

Claims (2)

First and second comafree coils electrically connected in series with the vertical coil main part; A YHC misconvergence adjustment unit connected in parallel to the first and second comaprider coils and controlling misconvergence on a screen by controlling a relative amount of current flowing through the first and second comaprider coils; First and second diodes connected in parallel with each other in reverse polarity, YH variable resistors connected in parallel between a cathode terminal of the first diode and an anode terminal of the second diode, and parallel to the second comma-free coil; The third and fourth comma-free coils connected in parallel to the YH variable resistors, the third and fourth resistors connected in series and connected in parallel to the YH variable resistors, and the connection points between the third and fourth resistors. First and second coils forming a double intermediate tap TAP of a vertical coil V COIL connected in series between an anode terminal of the first diode and a cathode terminal of the second diode; And Misconvergence of the deflection yoke, which is connected in series between the fourth comaprire coil and the YH variable resistor and includes a compensation resistor that equalizes the resistance values of the upper and lower comaprises to improve an imbalance generated during YH distortion correction. Compensator. The method of claim 1, And a resistance value of the compensation resistor has a resistance of 0.7 Ω.