JP2000149824A - Color picture tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a color picture tube device easily correcting convergence and an image distortion at low costs. SOLUTION: A color picture tube device is provided with an auxiliary coil 20 arranged on the phosphor screen 3 side in a deflection yoke 11 so as to be wound in the direction surrounding electron beams 7B, 7G, 7R emitted from an electron gun 8. The auxiliary coil 20 generates a magnetic field correcting convergence, which is provided with asymmetric constituents of three electron beams on the phosphor screen, or an image distortion when current synchronized with deflection current flowing in at least one deflection coil between horizontal and vertical deflection coils 10H, 10V is supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube apparatus equipped with a deflection yoke, and more particularly to an auxiliary coil for correcting convergence and image distortion having an asymmetric component of three electron beams on a phosphor screen. The present invention relates to a color picture tube device.

[0002]

2. Description of the Related Art Generally, a color picture tube device has a vacuum envelope comprising a panel 1 and a funnel 2, as shown in FIG. 8, and a phosphor screen comprising a three-color phosphor layer on the inner surface of the panel 1. A shadow mask 4 is disposed inside the phosphor screen 3 at a predetermined distance from the phosphor screen 3. On the other hand, the neck 6 of the funnel 2
An electron gun 8 which emits three electron beams 7B, 7G, 7R into the inside
Are arranged. A horizontal deflection coil 10H extends from the outside of the large diameter portion 9 of the funnel 2 to the outside of the neck 6.
And a deflection yoke 11 having a vertical deflection coil 10V. The horizontal of the deflection yoke 11,
The three electron beams 7B, 7G, 7 emitted from the electron gun 8 by the magnetic fields generated by the vertical deflection coils 10H, 10V.
R is deflected, the three electron beams 7B, 7G, and 7R are selected by the shadow mask 4, and the phosphor screen 3 is horizontally and vertically scanned to display a color image.

At present, such a color picture tube device emits three electron beams 7B, 7G, 7R arranged in a line composed of a center beam 7G and a pair of side beams 7B, 7R passing through the electron gun 8 on the same horizontal plane. By using an in-line type electron gun, the magnetic field generated by the horizontal deflection coil 10H is of a pincushion type and the magnetic field generated by the vertical deflection coil 10V is of a barrel type, three electron beams can be obtained over the entire screen without any special correction means. 7B, 7G, 7R
A self-convergence in-line type color picture tube device for concentrating images is mainly used.

However, in such a color picture tube device, the axis of the deflecting magnetic field often deviates from the axis of the electron beams 7B, 7G, and 7R due to geomagnetism and manufacturing variations. A convergence pattern or image distortion having an asymmetric component occurs.

The convergence pattern and the image distortion having the asymmetric component are theoretically eliminated by making the axes of the deflection magnetic fields coincide with the axes of the electron beams 7B, 7G and 7R. Axis and electron beam 7B, 7G
, 7R cannot be matched. For this reason, usually, the rear end (electron gun side) of the deflection yoke 11 is fixed to the neck 6 and the front end (phosphor screen side) is displaced in a direction orthogonal to the tube axis (Z axis). 7
B, 7G, and 7R are corrected by a method of reducing the axis deviation. Therefore, such a method cannot completely correct all convergence patterns and image distortions having asymmetric components. Therefore, when correcting the convergence pattern or the image distortion by such a method, various adjustment units are provided in the deflection yoke 10 as auxiliary units.

For example, when there is an axial misalignment in the horizontal direction, the horizontal trapezoidal distortion pattern 12a shown in FIG. 9A and the left and right bow-shaped distortion pattern 1 shown in FIG.
2B, a YV wide narrow pattern 12c in which a pair of side beam patterns 13B and 13R are shifted up and down as shown in (c) and a pair of convergence patterns having an asymmetric component as shown in FIG. An XH wide narrow pattern 12d in which the side beam patterns 13B and 13R are shifted left and right is generated. In addition, when the axis shift occurs in the vertical direction, as image distortion, FIG.
A vertical trapezoidal distortion pattern 14a shown in FIG. 0 (a) and an upper and lower bow-shaped distortion pattern 14b shown in (b) are generated, and as a convergence pattern having an asymmetric component, a pair of side beam patterns 13B as shown in FIG. , 13R are tilted up and down with respect to each other, as shown in FIG. 3D, a pair of side beam patterns 13B, 13R.
A YH cross pattern 14d in which the Rs are inclined left and right is generated.

The patterns 12a to 12d and 14a to
Of the image distortions and convergence due to horizontal axis deviation among 14d, the front end of the deflection yoke is geometrically displaced in the horizontal direction to correct the left and right bow distortion pattern 12b shown in FIG. 9B. A magnetic material is attached on the horizontal axis at the rear end of the deflection yoke to correct the XH wide narrow pattern 12d shown in FIG. 9D, and the vertical deflection coils disposed on the left and right with the vertical axis interposed therebetween. The horizontal trapezoidal distortion pattern 12a shown in FIG. 9A is corrected by adjusting the current balance between the left and right by a voltage-dividing resistor or the like, and a magnetic material is placed in the second and third quadrants at the rear end of the deflection yoke. Fig. 9
The YV wide narrow pattern 12c shown in (c) is corrected.

As for image distortion and convergence due to vertical axis deviation, the front end of the deflection yoke is geometrically displaced in the vertical direction to correct the upper and lower bow-shaped distortion patterns 14b shown in FIG. Then, the YH cross pattern 14d shown in FIG. 10D is corrected by adjusting the current balance between the left and right sides of the coma correction coils arranged above and below the horizontal axis with a voltage-dividing resistor or the like. By adjusting the current balance between the upper and lower horizontal deflection coils arranged above and below by using a differential coil or the like, FIG.
The XV cross pattern 14c shown in FIG.
A magnetic material is attached to the third and fourth quadrants at the rear end of the deflection yoke to correct the vertical trapezoidal distortion pattern 14a shown in FIG.

However, the magnetic material used for the above correction is
Since it is made of an inexpensive metal piece, an eddy current is generated in linkage with the magnetic field generated by the deflection yoke, and a demagnetizing field is generated. Therefore, when used in a recent multi-scan type display device, there is a problem that convergence changes due to a change in frequency. Also, from the viewpoint of the manufacture of the color picture tube device, it is better not to stick the magnetic material as much as possible.

Therefore, in actuality, with respect to the axial deviation in the horizontal direction, the deflection yoke is geometrically displaced in the horizontal direction, and the XH wide narrow pattern 12 shown in FIG.
d is corrected, and the left and right bow-shaped distortion pattern 1 shown in FIG.
2b is standardized and corrected by circuit means provided in the circuit for driving the color picture tube device, and the YV wide narrow pattern 12c shown in FIG. 9C is corrected by the left and right current balance of the vertical deflection coil. The standard trapezoidal distortion pattern 12a shown in FIG. On the other hand, with respect to vertical axis deviation, correction of the vertical trapezoidal distortion pattern 14a shown in FIG. 10A is managed according to standards without attaching a magnetic material, and provided in a circuit for driving a color picture tube device. Correction is made by circuit means.

However, when the color picture tube apparatus adjusted by such a method is finally incorporated in a display device and then corrected for a convergence pattern or image distortion, the color picture tube device shown in FIG.
The YH cross pattern 14d shown in FIG.
The YV wide narrow pattern 12c shown in FIG.
The XV cross pattern 14c shown in FIG. 0 (c) can be easily adjusted on the deflection yoke side, and has a vertical trapezoidal distortion pattern 14a shown in FIG. 10 (a) and a right and left bow distortion pattern shown in FIG. 9 (b). 9B, the XH wide narrow pattern 12d shown in FIG. 9D, the upper and lower bow-shaped distortion patterns 14b shown in FIG. The horizontal trapezoidal distortion pattern 12a shown in (1) cannot be adjusted effectively.

In recent years, an annular coil called a raster rotation coil has been disposed on the phosphor screen side of the deflection yoke, and a direct current has been passed through this coil to adjust the rotation of the image due to the mounting error of the deflection yoke or the geomagnetism. Color picture tube devices have been developed.

[0013]

In recent years, with the spread of liquid crystal display elements which do not generate a convergence pattern or image distortion structurally, further improvement in image quality of a color picture tube device has been reduced. Therefore, a means for easily and inexpensively correcting the convergence pattern and the image distortion is required.

However, as described above, there is no effective means for correcting conventional convergence and image distortion, particularly effective distortions such as horizontal trapezoidal distortion and upper and lower bow distortions which occur at the top and bottom of the screen. When a correction circuit is provided for correction, the vertical deflection current supplied to the vertical deflection coil must be changed in synchronization with the horizontal deflection current supplied to the horizontal deflection coil, and an expensive element is required. There is such a problem.

The present invention has been made in view of the above problems, and has as its object to constitute a color picture tube device which can easily and inexpensively correct convergence and image distortion.

[0016]

A deflection yoke having horizontal and vertical deflection coils is mounted from the outside of the large diameter portion of the funnel constituting the vacuum envelope together with the panel to the outside of the neck, and the electron gun is disposed in the neck. In a color picture tube apparatus which deflects the three electron beams emitted from the magnetic field generated by the horizontal and vertical deflection coils and directly scans the phosphor screen formed on the inner surface of the panel, the deflection yoke is disposed on the phosphor screen side. It is wound and arranged in a direction surrounding the electron beam emitted from the electron gun, and is supplied on the phosphor screen by a current synchronized with a deflection current flowing through at least one of the horizontal and vertical deflection coils.
An auxiliary coil for generating a magnetic field for correcting convergence or image distortion having an asymmetric component of the electron beam is provided.

The auxiliary coil was attached to the end of the deflection yoke on the phosphor screen side.

Further, the auxiliary coil is disposed on the phosphor screen side, away from the end of the deflection yoke on the phosphor screen side.

Further, the auxiliary coil is constituted by a combination of coils wound in opposite directions.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a color picture tube device which is one embodiment of the present invention. This color picture tube device has a vacuum envelope composed of a panel 1 and a funnel 2, and a phosphor screen 3 composed of a three-color phosphor layer that emits blue, green and red light is provided on the inner surface of the panel 1. A shadow mask 4 is disposed inside and at a predetermined distance from the phosphor screen 3. On the other hand, 3 in the neck 6 of the funnel 2
An electron gun 8 for emitting electron beams 7B, 7G, 7R is provided. Further, from the outside of the large-diameter portion 9 of the funnel 2 to the outside of the neck 6, horizontal deflection for generating a magnetic field for deflecting the three electron beams 7B, 7G, 7R emitted from the electron gun 8 in the horizontal direction (X-axis direction). A deflection yoke 11 having a coil 10H and a vertical deflection coil 10V for generating a magnetic field deflected in the vertical direction (Y-axis direction) is mounted.

Further, in this color picture tube device, the front end (end of the phosphor screen) of the deflection yoke 11 surrounds the passing area of the three electron beams 7B, 7G, 7R deflected by the deflection yoke 11. An auxiliary coil 20 is provided.

The auxiliary coil 20 is wound in the direction surrounding the electron beams 7B, 7G, 7R emitted from the electron gun 8 and reversely wound, and is composed of a combination of coils arranged at the same position. , Vertical deflection coil 10
By supplying a current synchronized with a deflection current flowing through at least one of H and 10V, a magnetic field in the direction of the tube axis (Z axis) is generated to finely deflect the electron beams 7B, 7G and 7R.

When the auxiliary coil 20 is disposed at the front end of the deflection yoke 11 and a current synchronized with a deflection current flowing through at least one of the horizontal and vertical deflection coils 10H and 10V is supplied to the auxiliary coil 20, geomagnetism and the like are obtained. Due to manufacturing variations of the color picture tube device, the deflection yoke 1
1 and the axes of the deflection magnetic fields and the electron beams 7B, 7G, 7
It is possible to easily and inexpensively correct a convergence pattern and an image distortion having an asymmetric component generated when R 1 is displaced from the axis.

The correction will be described below with reference to an embodiment.

[0026]

Embodiment 1 FIG. 2 shows a circuit configuration for correcting the horizontal trapezoidal distortion pattern 12a shown in FIG. To correct the horizontal trapezoidal distortion pattern, a pair of coils 22a and 22b, which are oppositely wound and constitute the auxiliary coil 20, are used.
Are connected in parallel via a voltage dividing resistor 23, resistors 24a and 24b are connected in series to the respective coils 22a and 22b, and a current i synchronized with the vertical deflection current is supplied to each coil 22a by a voltage dividing resistor 26. , 22b.

In this circuit, the contact 25 for distributing the current i
Is located at the middle point of the voltage dividing resistor 23, and when the current i is equally divided into the two coils 22a and 22b,
The magnetic fields generated from a and 23b cancel each other and do not substantially affect the electron beam.

However, for example, it is assumed that the voltage dividing resistor 23 is adjusted so that a current flows through one of the coils 22a, and the current i flows in the direction of the arrow 26 when the electron beam is deflected upward of the screen. At this time, if the electron beam is deflected to the upper left of the screen, as shown in FIG. 3, if the magnetic field generated by the current ia flowing through the coil 22a is B and the current component of the electron beam is I, then the left hand of Fleming According to the law, a downward force F acts on the electron beam. On the other hand, when the electron beam is deflected to the upper right of the screen, the direction of the current component I of the electron beam is reversed, and an upward force acts on the electron beam.

On the other hand, when the electron beam is deflected to the lower part of the screen, the direction of the current ia flowing through the coil 22a is opposite to that when the electron beam is deflected upward, and is deflected to the lower left of the screen. For example, when an upward force acts on the electron beam and the electron beam is deflected to the lower right of the screen, a downward force acts.

As a result, the electron beam is applied to the auxiliary coil 20.
9A, the horizontal trapezoidal distortion pattern 12a shown in FIG. 9A can be corrected, and the voltage dividing resistor 23 adjusts the shunt to both coils 22a and 22b. The large horizontal trapezoidal distortion pattern 12a can be corrected.

By adjusting the voltage dividing resistor 23 so that a current flows through the other coil 22b, the voltage of FIG.
A horizontal trapezoidal distortion pattern opposite to the horizontal trapezoidal distortion pattern 12a shown in FIG.

[0032]

Embodiment 2 FIG. 4 shows a circuit configuration for correcting a parallelogram distortion pattern on the upper and lower sides of the screen. When correcting the parallelogram distortion pattern, a pair of reversely wound coils 22a and 22b constituting the auxiliary coil 20 are connected to a voltage dividing resistor 23.
, And connected to the output terminal of a rectifier circuit 28 composed of a bridge via resistors 24a and 24b connected in series to the coils 22a and 22b, respectively. The rectified current is supplied to each coil 22a, 2 by a voltage dividing resistor 23.
2b.

In this circuit configuration, a current in the same direction flows through the coils 22a and 22b both when the electron beam is deflected upward and downward. Therefore, for example, one of the coils 22a is
3, the horizontal scanning line rotates counterclockwise and the parallelogram distortion that rises to the left can be corrected from the relationship shown in FIG. In addition, by allowing the current to flow through the other coil 22b, the horizontal scanning line rotates clockwise, and the parallelogram distortion that rises to the right can be corrected. Therefore, the voltage dividing resistor 2
By adjusting the shunt current to both coils 22a and 22b by means of 3, it is possible to correct a parallelogram distortion pattern of an arbitrary size.

[0034]

Third Embodiment FIG. 5 shows a circuit configuration for correcting the upper and lower bow-shaped distortion patterns 14b shown in FIG. 10B. When correcting the upper and lower bow-shaped distortion patterns, a pair of reversely wound coils 22a and 22b constituting the auxiliary coil 20 are connected in parallel via a differential coil 30, and a current i synchronized with the horizontal deflection current is subtracted. Each coil 23a, 2
3b.

With this configuration, the coils 22a, 22
The magnetic field generated by 2b changes in synchronization with the horizontal deflection. When the magnetic field is deflected to the left side of the screen, the horizontal scanning line gradually rotates clockwise according to the deflection. Gradually rotates counterclockwise as shown in FIG.
The upper and lower bow-shaped distortion patterns 14b shown in FIG. 0 (b) can be corrected.

In the correction of the upper and lower bow-shaped distortion patterns, the case where a current synchronized with the horizontal deflection current is applied to one set of coils constituting the auxiliary coil has been described. However, the circuit shown in FIG. Even when the supplied current is supplied, the upper and lower bow-shaped distortion patterns can be similarly corrected.

In each of the embodiments described above, a pair of coils wound in opposite directions constituting the auxiliary coil are connected in parallel. However, this pair of coils may be connected in series.

For example, as shown in FIG. 6, a pair of coils 22a and 22b wound in opposite directions are connected in series, and resistors 32a and 32 are respectively connected to the coils 22a and 22b.
b are connected in parallel, and the coils 22a and 22b and the resistor 3
A structure may be employed in which a voltage dividing resistor 23 is interposed between 2a and 32b.

In the above embodiment, a voltage dividing resistor and a differential coil are arranged in order to adjust the current balance of one set of coils constituting the auxiliary coil. However, the current balance flowing through this one set of coils is adjusted. Is not limited to these voltage-dividing resistors and differential coils, but may be other means.

In the above embodiment, the auxiliary coil is arranged close to the front end of the deflection yoke. However, this auxiliary coil may be located on the phosphor screen side of the deflection yoke, as shown in FIG. Alternatively, the deflection yoke 11 may be arranged on the phosphor screen side away from the front end.

[0041]

As described above, the direction of surrounding the electron beam emitted from the electron gun toward the phosphor screen side of the deflection yoke mounted from the outside of the large diameter portion of the funnel constituting the vacuum envelope to the outside of the neck. And a convergence or an asymmetric component of three electron beams on the phosphor screen by applying a current synchronized with a deflection current flowing in at least one of the horizontal and vertical deflection coils of the deflection yoke. When an auxiliary coil for generating a magnetic field for correcting image distortion is provided, convergence or image distortion having an asymmetric component which has conventionally been difficult to correct when adjusting the image quality by incorporating a color picture tube device into a display device. Can be easily and inexpensively corrected, and a color picture tube device displaying a high-quality image can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a color picture tube device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a circuit configuration of Embodiment 1 of the color picture tube device.

FIG. 3 is a diagram for explaining the effect of the circuit configuration of the first embodiment on an electron beam.

FIG. 4 is a diagram showing a circuit configuration of a second embodiment of the color picture tube device.

FIG. 5 is a diagram showing a circuit configuration of a third embodiment of the color picture tube device.

FIG. 6 is a diagram showing a circuit configuration different from the first to third embodiments.

FIG. 7 is a diagram showing a configuration of a color picture tube device different from the color picture tube device shown in FIG.

FIG. 8 is a diagram showing a configuration of a conventional color picture tube device.

FIGS. 9A to 9D are diagrams of a convergence pattern and an image distortion having an asymmetric component generated when the axis of the deflection magnetic field and the axis of the electron beam are shifted in the horizontal direction, respectively.

FIGS. 10A to 10D are diagrams of a convergence pattern and an image distortion having an asymmetric component generated when the axis of the deflection magnetic field and the axis of the electron beam are vertically displaced.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Panel 2 ... Funnel 3 ... Phosphor screen 6 ... Neck 7B, 7G, 7R ... 3 electron beam 8 ... Electron gun 9 ... Large diameter part 10H ... Horizontal deflection coil 10V ... Vertical deflection coil 11 ... Deflection yoke 20 ... Auxiliary coil 22a, 22b ... coil

Claims (4)

[Claims] 1. A deflection yoke having horizontal and vertical deflection coils is mounted from the outside of a large diameter portion of a funnel constituting a vacuum envelope together with a panel to the outside of a neck, and emitted from an electron gun disposed in the neck. A color picture tube device for scanning a phosphor screen formed on the inner surface of the panel by deflecting the three electron beams by a magnetic field generated by the horizontal and vertical deflection coils. It is wound and arranged in a direction surrounding the electron beam emitted from the gun, and is supplied with a current synchronized with a deflection current flowing through at least one of the horizontal and vertical deflection coils. An auxiliary coil that generates a magnetic field that corrects convergence or image distortion having an asymmetric component of the electron beam must be provided. Color picture tube apparatus according to claim. 2. The color picture tube device according to claim 1, wherein the auxiliary coil is attached to an end of the deflection yoke on the phosphor screen side. 3. The color picture tube device according to claim 1, wherein the auxiliary coil is arranged on the phosphor screen side of the deflection yoke, away from an end of the deflection yoke on the phosphor screen side. 4. The auxiliary coil according to claim 1, wherein the auxiliary coil comprises a combination of coils wound in opposite directions.
The color picture tube device according to any one of the above.