KR20020065660A - A Image Displaying Device - Google Patents

Abstract

PURPOSE: An image display device is provided to mount a distortion control device on horizontal/vertical axes of a color cathode ray tube between a deflection yoke and a fluorescent surface, and to apply another current to the distortion control device to form magnetic field, thereby controlling up/down distortion on a screen. CONSTITUTION: An image display device comprises as follows. A panel forms a fluorescent surface. A shadow mask is arranged inside the panel at regular intervals. An electronic gun is mounted on a network of the panel. A deflection yoke deflects electronic beams emitted from the electronic gun, to be located in a predetermined position of the fluorescent surface by the electronic beams. A distortion control device(12) winds coils(8) on a member in a straight line. The distortion control device is mounted on upper/lower horizontal axes of the fluorescent surface of a color cathode ray tube between the deflection yoke and the fluorescent surface. Another current is applied to the coils of the distortion control device, and a magnetic field is formed, to control upper/lower distortions on a screen.

Description

Image Display Device {A Image Displaying Device}

The present invention relates to a horizontal trapezoidal distortion occurring in upper and lower portions of screens of various shapes due to mechanical or product errors in a manufacturing process in an image display device, more specifically, a cathode ray tube and a deflection yoke used in an image display device. Distortion adjustment device for adjusting the upper and lower pincushion distortion.

Generally, in the color cathode ray tube, the electron beam 9 generated by the electron gun 1 is deflected on the screen, the bottom, the left or the right by the magnetic force generated from the deflection yoke to form the screen. The distortion of the screen formed by the scanned beam is generally called distortion. There are many reasons for the distortion, but first, when the cathode ray tube is assembled, it can be broadly divided into the cause of misalignment of the electron gun and the panel 2 and the assembly caused by assembling the deflection yoke.

With the recent introduction of flat color cathode ray tubes, the distortion phenomenon that can be overlooked in conventional curved color cathode ray tubes is revealed in our eyes even in flat cathode ray tubes (especially when both inside and outside surfaces are flat). Vendors are trying to raise the level of distortion further. However, it is not easy to construct a square screen like paper by the analog structure of cathode ray tube.

Therefore, in order to reduce the distortion caused by parts or assembly, a cathode ray tube manufacturer locally attaches a magnet component called magnet (5) to the periphery of the deflection yoke by using a small rectangular auxiliary body. I choose the method of correction the most.

In FIG. 1, the deflection of the beam of the color cathode ray tube is configured so that the beam from the electron gun 1 can be accurately scanned at a desired portion of the panel 2 for each of R, G, and B, but the center misalignment of the electron gun, the panel Due to various factors such as the center misalignment of the funnel (3) and the deflection center misalignment of the deflection yoke (4), it is impossible to form an accurate rectangular screen and various distortions as shown in FIGS. 2A and 2B or vice versa. The phenomenon occurs.

A method generally used to correct this distortion phenomenon is to use the correction of the magnet (5) to attach to the diagonal or upper and lower directions of the deflection yoke as shown in Figs. How to control the phenomenon. In addition, one of the methods to solve the deflection yoke itself is to use a CF coil (6) attached to the deflection yoke. The structure of the CF coil is designed to be complicated by a multipole structure, and a variable resistor is installed on the circuit board of the deflection yoke. It is not used widely because it is not good in terms of efficiency in comparison with complicated structure.

First, one of the most commonly used methods is to correct local distortion shape by using magnet around deflection yoke holder (13: Holder). There are disadvantages that can only be observed and adverse effects on local screen color purity and beam converging. This calibration also requires meticulous work and therefore is disadvantageous in terms of workability and productivity.

FIG. 5 is a diagram illustrating generation of wavy distortion of a screen by local distortion correction, and [Table 1] below shows a value of convergence changed by magnet correction.

TABLE 1

division R-G B-G X axis 0.05 0.05 Y axis 0.10 0.10

Next, the horizontal trapezoidal distortion using CF coil is controlled. First, the CF coil cannot be used to correct pincushion distortion in the up and down direction. Since the upper and lower parts are controlled together, there is no significant effect on the distortion adjustment that occurs only on the upper part or the lower part.The convergence of the upper and lower parts of the screen changes during the correction process. Cause.

Figure 6 shows a terminal plate for the horizontal trapezoidal distortion correction using a conventional CF coil and an example of adjustment, by moving the G / D of the terminal plate of the deflection yoke to adjust the distortion of the form as shown in (a) (b) When adjusted in the form of, the convergence at the top and bottom of the screen changes as shown in (b '). In order to correct this, the YV1 of the terminal board needs to be adjusted again, and since the distortion changes back to the shape as shown in (c), the distortion correction using the CF coil is ineffective due to the reverse action.

Therefore, the present invention has been made to solve the above problems, an object of the present invention is to be caused by the difference in mechanical coupling in the manufacturing process of the color cathode ray tube or the left and right unevenness of the deflection force in the deflection yoke manufacturing process It is an object of the present invention to provide an image display device having a distortion adjustment device that can conveniently and easily adjust distortion of a cathode ray tube screen.

1 is a view showing a general planar cathode ray tube shape combined with a deflection yoke;

2A to 2B are diagrams showing screen distortion forms of color cathode ray tubes.

3 is a view showing the shape of a conventional deflection yoke and distortion adjustment magnet;

4 is a view showing a state in which a conventional distortion adjusting magnet is attached to a deflection yoke, as viewed from the front of the deflection yoke opening;

5 is a diagram showing a distortion change when a conventional local distortion adjustment magnet is attached;

6 is a view showing a terminal plate and an adjustment example for horizontal trapezoidal distortion correction using a conventional CF coil;

7a to 7g is a view showing the principle and effect of the distortion encouragement device according to the invention,

8A to 8F are diagrams illustrating distortion value control according to a coupling angle and a position adjustment of a distortion yoke and a deflection yoke of the present invention;

9 is a view showing the principle and effect of the upper and lower pincushion distortion correction apparatus according to another embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

1: electron gun 2: panel

3: funnel 4: deflection yoke

5: magnet 6: CF coil

7: iron strip 8: coil

9: electron beam 10: magnetic field

12: distortion adjustment device 13: deflection yoke holder

Technical solution of the present invention for achieving the above object is a panel having a fluorescent surface formed on the inner surface, a funnel connected to the skirt portion of the panel, a shadow mask disposed at a predetermined interval on the inner surface of the panel, and the neck of the funnel An image display apparatus having a color cathode ray tube including an electron gun mounted to a part, and a deflection yoke for deflecting up and down and left and right so that the electron beams emitted from the electron gun strike a predetermined position of the fluorescent surface. To control the top and bottom distortion of the screen by mounting a coiled distortion adjusting device above and below the horizontal axis of the fluorescent surface outside the color cathode ray tube between the deflection yoke and the fluorescent surface, and applying a separate current to the coil of the distortion device to form a magnetic field. It features.

In addition, the linear member is an iron piece mainly composed of Fe, and the distortion adjusting device is preferably mounted above and below the deflection yoke in parallel with the horizontal plane of the fluorescent surface.

In addition, it is possible to control the amount of distortion adjustment by adjusting at least one of the strength of the current applied to the coil in the distortion control device, the size of the iron piece, the arrangement position of the distortion control device, the arrangement angle of the distortion control device.

Further, in the distortion adjusting device mounted on the color cathode ray tube, the coil may be wound around the iron piece in the vertical direction of the screen so that a magnetic field is generated across the upper and lower portions of the screen.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The present invention is to mount a distortion adjustment device for adjusting the upper and lower distortion of the screen above and below the deflection yoke of the color cathode ray tube in the image display device. As shown in Figs. 7A to 7G, the distortion adjusting device of the present invention winds a coil 8 on a thin linear member, for example, an iron piece 7 containing Fe as a main component, and causes a current to flow around the coil. By controlling the movement path of the electron beam (9) by generating a) by changing the direction of the current appropriately when the screen distortion occurs, we can make the screen shape of the shape we want. The reason for using thin iron strip inside the coil is to increase the magnetic field efficiency, and the line of magnetic force has the direction of entering or exiting perpendicular to the height direction of the steel plate.

FIG. 7A is a view from above of the distortion adjusting device 12 mounted on the top of the deflection yoke, and 7B is a view from the side of the deflection yoke. As shown in Figure 7a, b is a structure in which the iron piece in the vertical direction in the upper and lower center portion of the deflection yoke and each coil has a structure that can control the upper part of the screen or the lower part of the screen, respectively. have. The current supply of the coil takes the form of not being connected to the circuit of the deflection yoke but attaching a separate current line to the monitor circuit board (for example, a structure such as a tilt coil of the deflection yoke).

FIG. 7C is a front view in the form of an assembly of the distortion adjustment device, and FIG. 7D is a top view. As shown in FIG. 7E, the magnetic field shape 10 shown when the basic iron piece and the coil assembly are vertically coupled to the upper and lower centers of the deflection yoke is generated as shown in FIG. 7E. Since the path is controlled (F is a beam moving direction), when the distortion of the screen is generated as shown in FIG. 7F, the distortion adjusting device may be used to create a screen without distortion as shown in FIG. 7G.

One of the advantages of the present invention is to operate the upper and lower coils separately according to the type of distortion generation, thereby implementing a function of controlling only the upper or lower part which is not possible in the conventional distortion adjustment device using the CF coil.

In addition, since it takes the form of controlling the upper and lower sides of the screen, it is possible to minimize the change of convergence of the upper and lower parts of the screen generated by using the distortion adjusting device, and the adjusting device attached to the deflection yoke even when the change of convergence occurs. The deflection yoke terminal board (see 6) can be used to adjust the value without significantly affecting the distortion.

In addition, since the distortion adjustment of the screen takes a gentler form and does not take a very local correction form, it is much more effective in the color purity and convergence changes caused by attaching it to the deflection yoke using a separate magnet. It is advantageous.

The amount of distortion adjustment of the screen is related to the thickness of the coil or the number of windings, and the thickness of the coil in the present invention is set to 0.28 to 0.30φ and the number of windings is about 50 times, which is appropriate according to the size of the cathode ray tube and the size of the deflection yoke. You can adjust the number. The size of the iron piece was set to 60mm × 10mm × 2.5mm in width and can be adjusted in consideration of the characteristics and size of the cathode ray tube.

Therefore, the magnitude (value) of the distortion to be adjusted (varied) can be appropriately adjusted according to the size of the distortion control device, the number of windings of the coil, and the strength of the current applied to the coil. For example, in the case of a 17 ”cathode ray tube, the maximum value to be adjusted is about 2.0 to 3.0 mm.

As shown in Figures 8a to f. The engagement angle and position of the deflection yoke are set so that the amount of distortion can also be controlled according to the engagement angle and the engagement position of the distortion adjustment device and the deflection yoke of the present invention.

9 illustrates controlling upper and lower pincushion distortion as another embodiment of the present invention. This upper and lower pincushion distortion adjustment device is mounted vertically on the deflection yoke by winding the coil direction vertically in the middle of the upper and lower parts of the deflection yoke, the coil is wound in the vertical direction of the screen, the magnetic field is generated across the upper and lower screen As a result, the beam can be adjusted up and down. Using such a distortion adjustment coil, the pincushion distortion as shown in Fig. 9A can be adjusted as shown in Fig. 9B.

As described above, according to the present invention, a simple structure in which a coil of a coil is wound around the upper and lower centers of the deflection yoke in various shapes of distortions caused by mechanical or product errors commonly generated in the cathode ray tube and the deflection yoke. It is equipped with the distortion control device of to reduce the workability and local distortion of the screen due to the use of the commonly used correction magnet, and can control only the desired part of the upper and lower parts of the screen separately. Functions that could not be achieved can now be realized.

In addition, the present invention can reduce the decrease in productivity due to the correction work held by the cathode ray tube or the monitor assembly company, and can control the distortion portion that is emerging as a chronic problem of the flattened monitor to realize a flat screen closer to the rectangle. It became possible.

Claims (5)

A panel having a fluorescent surface formed on an inner surface thereof, a funnel connected to a skirt portion of the panel, a shadow mask disposed at a predetermined interval on an inner surface of the panel, an electron gun mounted on a neck portion of the funnel, and electron beams emitted from the electron gun An image display apparatus having a color cathode ray tube including a deflection yoke for deflecting up, down, left and right so as to strike a predetermined position of a fluorescent surface. A distortion adjusting device wound a predetermined number of coils on a linear member is mounted above and below the horizontal axis of the fluorescent surface outside the color cathode ray tube between the deflection yoke and the fluorescent surface, and a separate current is applied to the coil of the distortion device to form a magnetic field. An image display apparatus characterized by controlling the vertical distortion of the screen. The method of claim 1, And the linear member is an iron piece containing Fe as a main component. The method of claim 1, And controlling the amount of distortion adjustment by adjusting at least one of the strength of the current applied to the coil, the size of the iron piece, the arrangement position of the distortion adjustment device, and the arrangement angle of the distortion adjustment device. The method of claim 1, And the distortion adjusting device is mounted above and below the deflection yoke in parallel with the horizontal plane of the fluorescent surface. The method of claim 1, And a coil wound around the iron piece in the vertical direction of the screen in the distortion control device mounted on the color cathode ray tube to generate a magnetic field across the upper and lower portions of the screen.