JPH11273593A - Cathode-ray tube apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cathode-ray tube apparatus capable of easily correcting the inclination of scanning beam and displaying images without disconnection or overlap. SOLUTION: A defection apparatus 20 installed in the outside of a funnel comprises a horizontally deflecting coil 23 and a vertically deflecting coil 25. The horizontally deflecting coil 23 is installed so as to keep the symmetric axis 27 of the coil at an angle θto the horizontal direction X. The horizontally and vertically deflecting coils 23, 25 are arranged so as to keep an angle between the deflecting direction 27 of the horizontally deflecting coil 23 and the deflecting direction 28 of the vertically deflecting coil 25 from 90 deg. to the angle θ.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube device, and more particularly, to a plurality of regions formed by scanning a common phosphor screen by dividing the common phosphor screen into a plurality of regions by electron beams emitted from a plurality of electron guns. The present invention relates to a cathode ray tube device of a type in which one screen is formed by connecting small screens.

[0002]

2. Description of the Related Art In recent years, there has been a demand for a high-resolution cathode-ray tube for high-definition broadcasting or a large screen associated therewith, and its screen display performance is required to be even more severe. To meet these demands, it is necessary to flatten the screen surface, increase the resolution, and reduce the deflection aberration. At the same time, it is necessary to reduce the weight and thickness of the cathode ray tube.

As a cathode ray tube satisfying such demands,
Japanese Unexamined Patent Publication No. Hei 5-36363 discloses that an integrated phosphor screen formed on the inner surface of a flat face plate is deflected by a plurality of deflectors to deflect electron beams emitted from a plurality of electron guns. A cathode ray tube apparatus is shown which is divided into a plurality of regions for scanning.

According to this cathode ray tube device, a vacuum envelope having a flat face plate and a flat rear plate opposed to each other with a side wall interposed therebetween is provided to support an atmospheric load applied to the vacuum envelope. A plurality of supports are arranged between the face plate and the rear plate.
According to this method, the weight and thickness of the cathode ray tube and the flatness of the screen surface can be achieved. In addition, since the distance from the electron gun to the phosphor screen is shortened due to the reduction in thickness, the magnification of the electron lens can be reduced, and as a result, the electron beam spot on the phosphor screen can be reduced to achieve high resolution. . Furthermore, as the number of electron guns is increased, the deflection angle for one electron beam can be reduced without changing the depth of the vacuum envelope, and the deflection aberration can be reduced.

[0005]

Since the above-described cathode ray tube apparatus scans the phosphor screen by dividing the phosphor screen into a plurality of regions, a small image drawn in each scanned region is an electronic image. Signals supplied to the deflecting devices mounted corresponding to the guns and the electron guns must be connected and reproduced as images without breaks or overlaps over the entire area of the phosphor screen.

In order to obtain such an image, at a minimum,
The scanning lines must be continuously connected between the small screens. At this time, it is necessary to solve the following problems. Generally, the electron beam is slightly scanned also in the vertical direction during horizontal deflection, so that each scanning line has a slight inclination with respect to the horizontal direction. That is, at the left and right ends of the screen, the positions of the scanning lines in the vertical direction are displaced substantially by the interval between the adjacent scanning lines. Since the inclination of such a scanning line is very small, there is no problem in a normal cathode ray tube. However, in the case of the above-described cathode ray tube device having a plurality of electron guns, images become discontinuous between adjacent small screens. Therefore, in such a cathode ray tube device, it is necessary to correct a slight inclination of the scanning line and to make the scanning line horizontal with high accuracy.

By the way, in general, a cathode ray tube device of the type described above is provided with a correcting means for accurately correcting image distortion and convergence. Specifically, for example, it is possible to correct the inclination of the scanning line by providing an auxiliary coil in each of the plurality of necks and supplying a correction current for finely adjusting the trajectory of the electron beam to these correction coils. It is possible.

However, the interval between the scanning lines may be 1 mm or more, and it is necessary to increase the correction range in order to perform such a large amount of correction. As a result, an increase in power consumption and an accompanying increase in heat generation are not preferable in practical use. Further, an extra circuit is added, which complicates the system and increases the manufacturing cost.

The present invention has been made in view of the above points, and an object of the present invention is to provide a cathode ray tube device capable of easily correcting the inclination of a scanning line and displaying an image without breaks or overlaps. It is in.

[0010]

To achieve the above object, a picture tube device according to the present invention comprises a unit having an electron gun and a deflection device for scanning an electron beam emitted from the electron gun. , A common phosphor screen facing the plurality of units is provided, and a plurality of small screens formed on the phosphor screen by the plurality of units are connected to form a single image. Wherein each of the deflecting devices has a vertical deflecting unit and a horizontal deflecting unit, and the electron beam deflecting direction by the horizontal deflecting unit and the vertical deflecting unit so that scanning lines at boundaries between the small screens are continuous. The present invention is characterized in that the angle formed by the electron beam deflection direction is shifted by a predetermined angle from a right angle.

A cathode ray tube device according to the present invention includes a face plate having a phosphor screen formed on an inner surface thereof, a rear plate opposed to the face plate, and a plurality of plates extending outward from the rear plate. A plurality of electron guns respectively provided in the neck of the funnel and emitting an electron beam toward the phosphor screen, and the electron beams provided outside the respective funnels and emitted from the electron gun. A plurality of deflection devices for deflecting the phosphor screen by dividing the phosphor screen into a plurality of regions, wherein each of the deflection devices vertically deflects the electron beam, and horizontally deflects the electron beam. A horizontal deflecting unit for deflecting the electron beam in the direction, wherein the vertical deflecting unit and the horizontal deflecting unit are configured to deflect the electron beam by the horizontal deflecting unit and the vertical deflecting unit. The angle between the deflection direction of the electron beam with is characterized in that it is arranged to be shifted a predetermined angle from a right angle.

In the above-mentioned cathode ray tube, when the predetermined angle is θ, the deflection amplitude in the direction of forming the scanning line by the electron beam is A, and the interval between the scanning lines is s, the predetermined angle θ
Is characterized by | θ | = arctan (s / A).

According to the cathode ray tube device having the above-described configuration, the inclination of the scanning line is corrected by a simple configuration in which the horizontal deflection unit or the vertical deflection unit of the deflection device is inclined at a predetermined angle, and the distance between adjacent regions is corrected. Can be greatly reduced. Therefore, it is possible to provide a low-cost cathode-ray tube device capable of displaying a good image with no noticeable joint without providing special correction means.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cathode ray tube device according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, the cathode ray tube comprises a vacuum envelope 5, which comprises a substantially rectangular flat faceplate 1 and a faceplate 1
And a frame-shaped side wall 2 extending substantially perpendicular to the face plate 1 and a substantially rectangular flat surface joined to the side wall 2 and arranged in parallel with and facing the face plate 1. And a plurality of funnels 4 joined to the rear plate 3.

A plurality of, for example, 2
Zero rectangular openings 6 are formed, and are provided in a matrix form, for example, in five vertical rows and four horizontal rows. The plurality of funnels 4 have respective openings 6.
, And five in the horizontal direction (X direction) and four in the vertical direction (Y direction).
There are zero.

On the inner surface of the face plate 1, blue, green,
An integrated phosphor screen 8 having a stripe-shaped three-color phosphor layer extending in the vertical direction that emits red light and a black stripe provided between the three-color phosphor layers is formed.

In the vacuum envelope 5, a phosphor screen 8 is provided.
, A flat shadow mask 9 is arranged. The shadow mask 9 has a plurality of effective portions corresponding to a plurality of regions R1 to R20 of the phosphor screen 8 which are divided and scanned by an electron beam as described later.
A number of electron beam passage holes are formed in each effective portion.

The shadow mask 9 is divided in the horizontal direction according to the number of divisions of the area of the phosphor screen 8 in the horizontal direction.
8 and is supported on the rear plate 3. Between the face plate 1 and the rear plate 3, a plate support member 1 composed of a plurality of metal columns for supporting the atmospheric pressure load applied to the face plate 1 and the rear plate 3
1 is arranged. Each plate support member 11 has a base end fixed to the rear plate 3 and a front end in contact with the black stripe of the phosphor screen 8.

An electron gun 13 for emitting an electron beam is disposed in each of the necks 12 provided on the plurality of funnels 4. Further, the deflection device 2 is provided outside each neck 12.
0 is attached. The electron beam emitted from the electron gun 13 is deflected in the horizontal and vertical directions by the magnetic field generated by the deflecting device 20, and moves the phosphor screen 8 through the shadow mask 9 in a plurality of areas, in the illustrated example, in the horizontal direction. 5 regions, 4 regions in the vertical direction, a total of 20 regions R1 to R20
And scanning. The images drawn on the phosphor screen 8 by the divided scanning are connected by signals applied to the electron gun 13 and the deflecting device 20 to reproduce one large image without a break on the entire surface of the phosphor screen 8.

As shown in FIG. 3, each deflecting device 20 includes a flared separator 22 made of synthetic resin and having a small-diameter end on the neck 12 side of the funnel 4 and a large-diameter end on the cone side. A pair of saddle-shaped horizontal deflection coils 23 symmetrically disposed on the inner surface side of the separator 22, and a cylindrical core 2 surrounding the outer surface of the separator 22.
4 and wound around the core 24 to form the separator 22
And a pair of toroidal-type vertical deflection coils 25 arranged vertically symmetrically on the outer surface side.

The horizontal deflection coil 23 functions as a horizontal deflection unit that deflects the electron beam emitted from the electron gun 13 in the horizontal direction, and the vertical deflection coil 25 functions as a vertical deflection unit that deflects the electron beam in the vertical direction. I do. Then, the deflecting device 20 forms a scanning line extending in the horizontal direction X on the phosphor screen by deflecting the electron beam. The horizontal and vertical deflection coils 23 and 25 are not limited to the so-called saddle-toroidal coils shown in the figure, and other types of deflection coils may be used.

FIG. 4 is a schematic cross-sectional view of the deflection device 20 as viewed from the phosphor screen side. The horizontal and vertical deflection coils 23 and 25 include a deflection direction of the horizontal deflection coil 23 and a vertical deflection coil 25. Is deviated from the right angle by a predetermined angle θ.

More specifically, the horizontal deflection coil 23 includes:
It has an axis of symmetry 27 passing through the center O of the deflecting device 20, which axis 27 coincides with the direction of deflection of the horizontal deflection coil.
The horizontal deflection coil 23 is arranged in a state where the axis of symmetry 27 is inclined by an angle θ with respect to the horizontal direction X.

The vertical deflection coil 25 has an axis of symmetry 28 passing through the center O of the deflection device 20, and this axis of symmetry 28 coincides with the deflection direction of the vertical deflection coil. The vertical deflection coil 25 is arranged in a state where the symmetry axis 28 is aligned with the vertical direction Y.

By thus arranging the horizontal deflection coil 23 at an angle, the horizontal deflection magnetic field BH at the center O forms an angle θ with respect to the vertical direction Y, and at the time of horizontal deflection, the electron beam is shifted with respect to the horizontal direction X. Therefore, a force FH in an obliquely upward direction is received by the angle θ. Thereby, the inclination of the scanning line can be corrected. In FIG. 4, the angle θ is exaggerated, but is normally set to 1.5 ° or less.

The inclination angle θ of the horizontal deflection coil 23 is determined as follows. Now, assuming that the deflection amplitude of the electron beam in the horizontal direction is AH and the interval between the scanning lines is S, the inclination φ of the scanning line is given by φ = −arctan (s / AH) when the horizontal deflection coil is not tilted. .

In this case, as shown in FIG. 5, the images drawn in the adjacent regions of the face panel 1, for example, R8 and R9, are discontinuous at the boundary regions.
In FIG. 5, reference numerals 30A, 31A, 32A, 33A,
And 30B, 31B, 32B, and 33B denote scanning lines, respectively, and discontinuity of the scanning lines occurs at the position of the boundary 34 of the region by the interval s between the scanning lines due to the inclination φ of the scanning lines.

Therefore, according to the present embodiment, the inclination of the scanning line is corrected by inclining the horizontal deflection coil 23 by the angle θ = −φ. As a result, as shown in FIG. 6, each scanning line becomes horizontal, and becomes continuous in the adjacent regions R8 and R9. In FIGS. 5 and 6, the number of scanning lines is very small, such as four, for ease of explanation.

As the scanning method, there are generally a sequential scanning and an interlaced scanning. In the case of the interlaced scanning, the scanning line interval s is a value for a field, that is, twice the value for a frame. Become. Further, depending on the cathode ray tube device, the vertical deflection of the electron beam may be performed in the opposite direction to the normal direction, that is, from the bottom to the top. In this case, the direction in which the horizontal deflection coil 25 is inclined is reversed.

Further, in the above embodiment, the scanning line is formed in the horizontal direction X. However, in the case of a cathode ray tube apparatus in which the scanning line is formed in the vertical direction Y, the vertical deflection coil 23 is used instead of the horizontal deflection coil 23. The deflection coil 25 may be disposed at a predetermined angle θ with respect to the vertical direction Y.

Therefore, the angle between the deflection direction of the horizontal deflection coil 23 and the deflection direction of the vertical deflection coil 25 is 90 ° +
When θ is set, the deflection amplitude of the scanning line is A, and the scanning line interval is s.
Then, | θ | = arctan (s / A) can be expressed as follows.

Normally, in the deflection coil, the orthogonality between the horizontal deflection coil 23 and the vertical deflection coil 25 is regarded as important. If they are not orthogonal, a phenomenon called so-called crosstalk, in which an induced current flows through the vertical deflection coil due to the horizontal deflection magnetic field, occurs. This causes undesirable undulations in the scanning lines.

Therefore, when the orthogonality between the horizontal deflection coil 23 and the vertical deflection coil 25 is shifted as in the present embodiment, there is a possibility that undulation may occur in the scanning lines due to crosstalk. Can be suppressed by a method such as providing a resistor between the terminals.

In practice, a slight asymmetric component is present in the deflection magnetic field due to variations in the manufacturing of the deflection coil and the like, so that the inclination of the scanning line may vary depending on the location. In this case, the inclination of the scanning line may be optimized for the entire cathode ray tube.

When it is necessary to display video systems having different numbers of scanning lines, it is sufficient to appropriately deal with them. For example, the scanning line interval of the HDTV system is about half the scanning line interval of the NTSC system. If it is necessary to cope with both, the inclination θ is determined with emphasis on one of the methods, and the other method may be corrected by another correction means. It may be an average value of both.

As described above, according to the cathode ray tube device having the above-described configuration, the simple configuration in which the horizontal deflection coil or the vertical deflection coil in the deflection device is simply disposed at an angle does not require any special correction means. The inclination of the scanning line can be corrected, and the discontinuity of the scanning line between adjacent areas can be significantly reduced. As a result, a cathode ray tube device capable of displaying a good image with no noticeable joint can be provided at low cost.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention.
For example, the deflecting device is not limited to the one using electromagnetic deflection using a coil, but may be one using electrostatic deflection using a deflecting plate, or a combination of both.

[0038]

As described above in detail, according to the present invention, in a cathode ray tube device which has a plurality of electron guns and a deflection device and divides a phosphor screen into a plurality of regions for scanning, It is possible to provide a cathode ray tube device capable of easily correcting the discontinuity of the scanning line at the boundary of the small screen due to the tilt, and capable of displaying an image with no noticeable joint.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a cathode ray tube device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is a side view showing a deflection device of the cathode ray tube device.

FIG. 4 is a sectional view taken along line BB in FIG. 3;

FIG. 5 is a diagram schematically showing a state in which scanning lines are discontinuous between small screens due to the inclination of the scanning lines.

FIG. 6 is a diagram schematically showing a state in which scanning lines are continuous by correcting the inclination of the scanning lines.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Face plate 3 ... Rear plate 4 ... Funnel 5 ... Vacuum envelope 8 ... Phosphor screen 12 ... Neck 13 ... Electron gun 20 ... Deflection device 23 ... Horizontal deflection coil 25 ... Vertical deflection coil 27, 28 ... Symmetry axis

Claims (5)

[Claims] A plurality of units each having an electron gun and a deflecting device for scanning an electron beam emitted from the electron gun, and a common phosphor screen facing the plurality of units is provided; In a cathode ray tube device for forming one image by connecting a plurality of small screens formed on a phosphor screen by the plurality of units, each of the deflecting devices has a vertical deflecting unit and a horizontal deflecting unit. So that the scanning line at the boundary between screens is continuous,
A cathode ray tube device wherein an angle formed between the direction of deflection of the electron beam by the horizontal deflection section and the direction of deflection of the electron beam by the vertical deflection section is shifted from a right angle by a predetermined angle. 2. A face plate having a phosphor screen formed on an inner surface, a rear plate opposed to the face plate, a plurality of funnels extending outward from the rear plate, and a neck of the funnel. A plurality of electron guns each of which emits an electron beam toward the phosphor screen, and a plurality of electron guns provided outside each of the funnels, deflecting the electron beam emitted from the electron gun to deflect the phosphor screen. A plurality of deflecting devices that scan by dividing into a plurality of regions, each of the deflecting devices, a vertical deflecting unit that deflects the electron beam in the vertical direction, and a horizontal deflecting unit that deflects the electron beam in the horizontal direction, Wherein the vertical deflection unit and the horizontal deflection unit each have an angle formed between the direction of deflection of the electron beam by the horizontal deflection unit and the direction of deflection of the electron beam by the vertical deflection unit. A cathode ray tube device, wherein a degree is shifted from a right angle by a predetermined angle. 3. The predetermined angle is θ, the deflection amplitude of the electron beam in the scanning line forming direction is A, and the interval between the scanning lines is s.
3. The cathode ray tube device according to claim 1, wherein the predetermined angle θ is represented by | θ | = arctan (s / A). 4. When the direction in which scanning lines are formed by the electron beam is a horizontal direction, the predetermined angle is θ, the deflection amplitude of the electron beam along the horizontal direction is AH, and the interval between the scanning lines is s. 3. The cathode ray tube device according to claim 1, wherein the predetermined angle θ is represented by | θ | = arctan (s / AH). 4. 5. The vertical deflection unit includes a vertical deflection coil having a symmetry axis extending in a vertical direction, and the horizontal deflection unit includes:
5. The cathode ray tube device according to claim 4, further comprising a horizontal deflection coil having a symmetric axis extending at a predetermined angle [theta] with respect to a horizontal direction.