KR100493857B1 - Method for self correction of INNER PIN distortion using horizontal deflection coil and deflection yoke for the same - Google Patents

Abstract

The present invention relates to a method for correcting a pin distortion phenomenon generated in a CRT product and a deflection yoke accordingly.

To this end, the present invention is divided into a neck portion and a screen vent portion and an extension portion connecting the neck portion and the screen vent portion, and are provided on the inner circumferential surface of the coil separator of the deflection yoke and have a horizontal deflection coil to generate a horizontal deflection magnetic field. In the method for correcting the pin distortion of the screen, the screen bent portion of the horizontal deflection coil is divided into four quadrants, and the length of the effective length of a specific portion of the extension part located in the diagonal direction of the screen bent portion of each of the quadrants Generating a pincushion in a corner area of the screen by extending close to the plane of the screen; Compensating the entire pincushion of the screen by adjusting the deflection control circuit of the display set, thereby correcting the pincushion generated in the above step and the inner inner pin phenomenon of the middle part of the screen.

The present invention can reduce the production cost because it does not need to provide an additional circuit as in the prior art to suppress the phenomenon of the pincushion in the middle portion of the screen, and consumes because it does not use a circuit for pincushion suppression The power can be reduced, and as the occurrence of the dispersion along the winding of the coil increases, it is possible to solve the dispersion of the middle pin and the destabilization of the characteristics.

Description

Method for self correction of INNER PIN distortion using horizontal deflection coil and deflection yoke for the same}

The present invention relates to a method for correcting a pin distortion phenomenon occurring in a CRT product. In particular, the pincushion of the middle part is extended by extending the effective electric field in a specific direction at an angle corresponding to a specific area of the screen band portion diagonal of the horizontal deflection coil. Self-intermediate pin distortion correction method using a horizontal deflection coil and a deflection yoke accordingly.

In general, cathode ray tube (CRT; Cathode-Ray-Tube) is a water tube that displays an image on a TV receiver, which is called a brown tube. It is excellent in brightness, viewing angle, manufacturing cost, and contrast, and is currently used the most in the world. It is a display device. The principle of the cathode ray tube is that when a metal or the like is heated to a high temperature, electrons in the atoms forming the material are released and radiated into the space.

Cathode ray tubes are divided into shadow mask type, chromatron type, and trinitron type.In most color TV receivers, about 300,000 pieces are located at about 10mm away from the fluorescent surface. The type equipped with the shadow mask of the thin iron plate which the fine hole was formed is mainly used.

The operation of the color image implementation on the screen of the cathode ray tube is briefly described. The optical component of the subject is red, green and blue, and the color component included in the subject is decomposed into three color signal components and transmitted. The screen surface is coated with a fluorescent film that emits red, green, and blue light, and the three color signal components are synthesized to reproduce the original color of the original subject.

That is, red, blue, and green fluorescent points are applied to the screen surface on which the image is displayed. To emit light, three electron guns respectively responsible for the red, blue, and green signals are required. In addition, a deflection yoke must be provided so that each electron beam emitted from the electron gun passes through the shadow mask to accurately reach each fluorescent point.

The electric image made on the target tube target surface of the camera is composed of a number of points with different charge amounts, and in order to output this as an image signal, the electric image must be sequentially decomposed from the upper left side to the lower right side of the target surface. And the video signal transmitted in this manner is assembled in sequence on the receiver side of the TV to produce an image. The disassembly or assembly of such images is called scanning.

This scan consists of horizontal scan from left to right and vertical scan from top to bottom. In the actual TV receiver, the scan lines are set to 525, which makes scanning at very high speed and about 1/30 second to scan the screen. It takes In other words, every 30 images are transmitted in one second, which is seen as a continuous screen in the human eye.

However, in practice, the scan is made from top to bottom and left to right according to the time, so the top side is erased and some flicker occurs in the whole screen. To prevent this, the interlaced scan which repeats 262.5 scan lines twice I'm using the method.

The deflection yoke is responsible for the proper scanning of the electron beam, and the electron beam of the deflection yoke acts on the straight electron beam to bend the direction of movement of the electron beam. Will be done.

That is, the deflection yoke is the most important element of the magnetic device of the cathode ray tube, and serves to allow an electric signal transmitted in time series to be reproduced as an image on the cathode ray tube screen.

In other words, as the electron beam emitted from the electron gun goes straight onto the screen by the high voltage, only the central phosphor (fluorescent material) of the screen emits light, so that the electron beam is deflected to reach the screen in the order of scanning from the outside. The deflection yoke forms a magnetic field so that the electron beam is deflected to the fluorescent film coated on the screen of the cathode ray tube by using an electromagnetic force when the electron beam passes through the magnetic field and changing its direction of travel.

Hereinafter, a cathode ray tube and a deflection yoke provided therein will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side view showing a typical cathode ray tube, and as shown, the deflection yoke 104 is positioned in the RGB electron gun 103 of the cathode ray tube 100 and scans an electron beam scanned from the electron gun 103a. The film is deflected by the fluorescent film applied to the film.

The electron gun section 103 focuses the electron flow emitted from the cathode in the form of a beam and concentrates the fluorescent film at one point. As the types thereof, a unipotential electron gun type and a bipotential electron gun type are used.

When focusing on the fluorescent surface, the unpotential type electron gun has the advantage that the focus is relatively large, but the depth of focus is deep and the focus is reduced due to the fluctuation of voltage even though there is a deep depth of focus and some error occurs electrically or mechanically on the entire surface of the fluorescent surface. It has the advantage of little deviation, and is mainly used for electron guns in black and white CRTs.

On the other hand, the bi-potential type electron gun requires a high pressure dedicated to Forks, but the configuration is somewhat difficult, but the trajectory correction of the electron beam is easy, and the distortion of the electron beam is less, and the CRT is mainly used in color.

The electron beam emitted from the electron gun passes through the hole of the shadow mask and emits light by irradiating respective fluorescent points. The larger the diameter of the shadow mask hole, the better the transmittance of the electron beam and the brighter the screen, but the drawback is that the greater the possibility of color mixing between colors.

The transmittance of the electron beam is approximately 15 to 18% in the center of the screen, and only this causes the fluorescent surface to emit light, and the rest hits the shadow mask, resulting in heat loss. For this reason, the back side of the shadow mask is blackened to improve heat dissipation.

Phosphor of the fluorescent film (Phosphor) is to change the electron energy to light due to the collision of the electron beam, and the selection and coating technology of the fluorescent material should be considered for proper color, its persistence and good life.

The deflection yoke 104 has a pair of coil separators 110 which are symmetrical in shape and are combined as a whole, and the coil separator 110 comprises a horizontal deflection coil 115 and a vertical deflection coil 116. It is provided to insulate and at the same time assembling their positions, the screen portion 111a and the rear cover portion 111b and the rear cover portion coupled to the screen surface 102 side of the cathode ray tube 100. It is composed of a neck portion 112 formed integrally extending from the center plane of 111b) and coupled to the electron gun portion 103 of the cathode ray tube 100.

A horizontal deflection coil 115 and a vertical deflection coil 116 are formed on the inner and outer circumferential surfaces of the coil separator 110 as described above to form a horizontal deflection magnetic field and a vertical deflection magnetic field by power applied from the outside.

In addition, a pair of ferrite cores 114 are installed to surround the vertical deflection coil 116 and formed of a magnetic material to reinforce the magnetic field generated by the vertical deflection coil 116.

A printed circuit board (p) is installed at one side of the rear cover part 111b of the coil separator 110 to supply power to the horizontal and vertical deflection coils 115 and 116. Control the electrical signal.

When sawtooth wave currents of different frequencies are applied to the horizontal and vertical deflection coils 115 and 116, the magnetic deflection lines of the horizontal deflection coil 115 are generated by the left-hand law of Fleming so that the electron beam is forced in the horizontal direction. In the deflection coil 116, the electron beam is forced in the vertical direction by the magnetic lines in the horizontal direction.

Accordingly, the three-color electron beams of red (R), green (G), and blue (B) emitted from the electron gun 113a are deflected by a predetermined angle to determine dice on the screen.

On the other hand, the deflection yoke shown in Figure 1 according to the winding structure of the coil saddle-saddle (Saddle-Saddle) type shown in Figures 2 and 3 and Saddle-Toroidal type (Saddle-Toroidal) type slightly different from the winding structure (shown Omitted).

In the saddle-saddle deflection yoke shown in FIGS. 2 and 3, a saddle-type horizontal deflection coil 115 is installed on the upper and lower inner circumferential surfaces of the screen portion of the coil separator 110 having a substantially conical shape and saddles are disposed on the left and right sides of the outer circumferential surface. A vertical deflection coil 116 is installed.

In order to reinforce the magnetic field of the vertical deflection coil 116, a substantially cylindrical ferrite core 114 is installed on the outer circumferential surface of the screen portion 111a of the coil separator 110.

In addition, a coma-free coil (not shown) is installed around the outer circumference of the neck portion 112 of the coil separator 110 to correct a coma generated by the vertical deflection coil 116.

Saddle-toroidal deflection yoke is provided with a saddle-shaped horizontal deflection coil 115 on the upper and lower inner circumferential surface of the screen portion of the coil separator 110 of the substantially conical shape and a substantially cylindrical ferrite core 114 on the outer circumference thereof. A toroidal vertical deflection coil 116 is wound along upper and lower sides of the ferrite core 114.

In addition, a coma-free coil (not shown) is installed around the outer circumference of the neck portion 112 of the coil separator 110 to correct a coma generated by the vertical deflection coil 116.

A printed circuit board (p) is installed at one side of the rear cover part 111b of the coil separator 110 to supply power to the horizontal and vertical deflection coils 115 and 116. Control the electrical signal.

The cathode ray tube (CRT) having the above configuration has recently faced a competitive relationship with LCDs and PDPs, which are flat displays due to the continuous light weight and flattening of display devices in the display market.

The following briefly describes the LCD and PDP displays, which are in charge of the cathode ray tube (CRT) and which are important parts of the display apparatus.

Currently, desktop monitors are roughly classified into CRT monitors and TFT LCD monitors. As the monitors increase in size, the demand for LCD monitors is gradually increasing due to the limitation of space with conventional CRT monitors.

LCDs began to be used as segment type electronic calculators and watch displays in the early 1970s, and have been applied to electronic notebooks. Today, products such as PCs, liquid crystal color TV receivers, and car navigation systems are used. It is applied to a variety of applications.

Initially, display performance was much lower than that of CRT, but recently, TFT (Thin Film Transistor) LCDs have been developed to enable high contrast, wide viewing angle, high resolution, and high-speed response. Color and video screens can be provided.

The display performance required by the display device includes high contrast ratio, high brightness, high resolution, displayability, high-speed response, and wide viewing angle. The LCD provides image information such as text and graphics even in the conventional passive matrix structure. However, in the simple matrix structure, there is a problem that their characteristics are in conflict with each other.

In other words, if one characteristic is good, the other characteristics are deteriorated, which makes it impossible to improve the overall performance, and in particular, a problem of cross talk occurs.

In order to solve this problem, the developed is a TFT (Thin Film Transitor) LCD of an active matrix structure to improve the display performance by applying a switching element to each pixel.

Briefly explaining the principle of the TFT (Thin Film Transitor) LCD, contrast is generated by injecting a liquid crystal, which is an intermediate between solid and liquid, between two thin glass plates and changing the arrangement of liquid crystal molecules by a voltage difference between electrodes provided on the upper and lower glass plates. It is a display device using a kind of light switching phenomenon to display an image through.

On the other hand, PDP is a type of flat panel display, a display device using a gas discharge, the name 'plasma' is named because the gas generated by the discharge is plasma. The PDP works by inserting a plasma (a mixture of neon and xenon gas) between two sealed glass plates with parallel electrodes installed on the surface. The glass plates are completely sealed and the electrodes are at an exact angle to create a pixel. .

 In this case, when the voltage pulse passes between the two electrodes, the inserted gas becomes a weakly ionized plasma state that emits UV radiation while causing chemical change. The emitted UV radiation acts on the color phosphor and produces visible light at each pixel, combining the light to produce the required image.

PDP is used for factory automation (FA), vending machine, fuel flow meter and so on.In recent years, PDP has been used for electronics for office automation (OA), including PCs according to the trend of small size and light weight of display devices. It is mainly adopted in the apparatus.

As described above, the configuration and characteristics of the cathode ray tube, which has been widely used as a display device, and the LCD and PDP, which are new display devices that have been developed through a lot of research and investment, have been briefly described.

Recently, new types of display devices, such as LCD and PDP, are mainly used in electronic products equipped with computer monitors, TV receivers, and other display devices because screens are flat and have excellent resolution. According to the trend of advanced display, the conventional CRT is newly transformed according to this trend. The main problems to be solved in order to flatten the CRT are geometric distortion and misconvergence.

The following describes the misconvergence phenomenon which is a problem in the CRT.

In the saddle-saddle or saddle-toroidal deflection yoke, the magnetic field generated on both sides of the oppositely installed deflection coils differs depending on the scattering characteristics of the vertical and horizontal deflection coils and the magnitude of the relative current amount.

In this case, the three color electron beams which are initially emitted from the neck portion of the coil separator, that is, integrally extending from the rear cover portion and coupled to the neck portion coupled to the electron gun portion of the cathode ray tube, are positioned for each electron gun in charge of red, green, and blue. Due to the difference between the magnetic fields generated in the and the deflection coils, the vector trajectory of each beam has different characteristics, and thus, miss convergence occurs on the screen.

In order to accurately produce an image on a color monitor or CRT, the electron beams emitted from the red, green, and blue electron guns in the cathode ray tube must be precisely gathered at one point at the same time. That's how it is.

When a misconvergence occurs, a problem occurs that characters or pictures overlap and become unclear on the screen, and in general, the misconvergence becomes larger in the periphery than the center of the screen due to the structure of the cathode ray tube.

In general, misconvergence displayed on the screen includes a landing error, a distortion error, a VCR distortion, HCR, YV, YH, CV, and PQH.

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. It means misconvergence of narrowed or widened state.

On the other hand, the distortion error is a misconvergence of the state 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 in a state where the electron beams B, G, and R are scanned at the edges of the screen so that the beam cannot be scanned at the edges. It refers to the misconvergence of the barreled or pinned state.

On the other hand, as shown in FIG. 4, the HCR and the red beam R and the blue beam B are accurately scanned on the screen, while the green beam G is not accurately scanned on each pixel of the screen, and the horizontal direction error is obtained. Is generated to be located inside or outside the red beam R and the blue beam B, and refers to misconvergence having horizontal unbalance.

In case of the HCR distortion, the inductance of the horizontal deflection coil is matched by additionally installing the balance coil BC and moving the core of the balance coil so that the inductance difference between the horizontal deflection coils installed on the upper side and the lower side does not occur. Will be adjusted.

On the other hand, the VCR is shown in Figure 5, when the white line is displayed in the horizontal direction along the top and bottom of the screen, the red beam (R) and blue beam (B) is accurately scanned and matched on the screen while the green The beam G refers to a misconvergence in which an error occurs in the vertical direction without being accurately scanned in each pixel of the screen.

In the case of VCR distortion, it is mainly more prominent near the top and bottom of the screen and does not change in the center of the screen.

Coma Free is the VCR (Ver.Center Raster) characteristic of the deflection yoke, i.e. the center of the red beam (R) / blue beam (B) and the green beam (G) at the measuring point on the vertical axis of the cathode ray tube. It makes the misconvergence sensitivity of the direction good. The pin magnetic field generated in the Comapri cancels the barrel magnetic field generated in the vertical deflection coil so that the green beam G matches the red beam R and the blue beam B.

On the other hand, CV refers to the misconvergence of scanning the red beam (R) and the blue beam (B) is crossed with each other in the vertical direction at the corner portion of the screen, YV is the X axis and the screen, as shown in FIG. In case of dividing by Y axis, it refers to vertical misconvergence in which the horizontal line of the red beam R is shifted from the horizontal line of the blue beam B in the upper and lower parts of the Y axis. In this case, the variable resistance is mainly connected to the left and right vertical deflection coils. By installing the variable resistor to adjust the relative strength of the current flowing to the left and right of the vertical deflection coil.

On the other hand, as shown in FIG. 7, YH is a misconvergence in which the vertical line of the red beam R and the vertical line of the blue beam B intersect each other. That is, the vertical line (vertical line) of the blue beam B deviates from the upper and lower ends of the screen center with respect to the red beam R, and the vertical line of the blue beam B with respect to the red beam R. On the basis of the reference, the state in which the vertical line of the blue beam B deviates to the left is indicated by a minus (-). On the contrary, the state in which the vertical line of the blue beam B deviates to the right on the basis of the red beam R is positive ( Mark with +).

Next, geometric distortion of the cathode ray tube will be described.

Geographic Distortion (G / D) refers to a state in which the screen is not normal and is distorted, as shown in FIGS. 8 and 9.

In particular, the N / S distortion and the positive (+) of the pin (PIN) occur due to the planarization of the CRT. The upper and lower magnetic fields of the Y-axis, as shown in the horizontal magnetic analysis diagram shown in FIG. 11, the PQH becomes negative (-) as shown in FIG. 11, and as a result, the red beam R and the blue beam B are opened about the Y axis in the diagonal direction. FIG. 12 illustrates that the N / S distortion is positive (+) according to the magnetic field characteristic of FIG. 10.

13 to 15 illustrate misconvergence and distortion in accordance with the vertical magnetic field analysis. FIG. 13 shows a vertical magnetic field, FIG. 14 shows a misconvergence, and FIG. 15 shows a distortion.

On the other hand, in recent years, CRT R & D has been making a lot of efforts to improve the flattening characteristics of CRTs by reducing geometric distortion and misconvergence to meet the demands of the display market.

Among the types of misconvergence, as a method for pin distortion correction, a pair of bias magnets for applying a fixed bias to a pair of drum cores wound with a horizontal correction coil and a variable bias wound with a vertical correction coil are typically used. The method of changing the inductance (L) value during the up and down deflection by using a coil was used.

The above-described conventional method is disclosed in Japanese Patent Laid-Open No. 11-261839, which will be described below with reference to the accompanying drawings in Japanese Patent Laid-Open No. 11-261839.

When described with reference to the accompanying drawings as follows. FIG. 16 is a circuit diagram showing an example of a conventional middle pin distortion correction device, and FIG. 17 is a side view of an example of a main configuration of a middle pin distortion correction reactor used in a conventional middle pin distortion correction device.

As shown, a bias magnetic field is applied to two horizontal correction coils L1 and L2, one vertical correction coil L3, and the horizontal correction coils L1 and L2 and the vertical correction coil L3 connected in series. A middle pin distortion correction reactor 1 composed of a pair of magnets 2 and 3 is provided, and horizontal correction coils L1 and L2 are connected to a horizontal deflection circuit to modulate the vertical correction coil at a period of vertical deflection current. By generating the magnetic field in the opposite direction to the bias magnetic field, the impedance of the horizontal correction coil is changed to correct the pin distortion in the middle of the screen.

In addition, as shown in FIG. 17, the intermediate pin distortion correction reactor 1 has a first horizontal correction coil L1 wound around the first core 4 and a second horizontal correction coil wound around the third core 6. Three correction coils, which are the coil L2 and the vertical correction coil L3 wound around the second core 5, are formed.

In addition, a pair of magnets 2 and 3 are arranged at both ends of the three cores 4 to 6, and the polarity thereof is S pole at one end and N pole at the other end.

Accordingly, the winding directions of the two horizontal correction coils L1 and L2 are directions in which magnetic fields in opposite directions are generated. On the other hand, the winding direction of the vertical correction coil L3 is a direction in which a magnetic field in the opposite direction is generated from the magnetic field (bias magnetic field) generated by the pair of magnets 2 and 3.

The middle pin distortion correction reactor 1 is constituted as described above, and in the conventional screen distortion correction apparatus, such a middle pin distortion correction reactor 1 is used to correct pin distortions occurring on the left and right sides of the screen.

16 and 17, the same member numbers indicate the same configuration, where L4 and L5 are horizontal deflection coils, L6 and L7 are vertical deflection coils, R1 to R4 are resistors, VR1 is variable resistors, and D1 and D2 are diodes, respectively. Indicates.

The middle pin distortion correction reactor 1 shown in FIG. 16 is an equivalent circuit, and its configuration is as described with reference to FIG.

In Fig. 16, the horizontal deflection coils L4 and L5 and the vertical deflection coils L6 and L7 are coils of the deflection yoke. As is well known, the horizontal deflection coils L4 and L5 have a horizontal period from the horizontal deflection circuit not shown. The sawtooth wave current is supplied, and the sawtooth wave currents of the vertical period are supplied from the vertical deflection circuits L6 and L7 to deflect the electron beam.

The pin distortion correction process using the conventional technique configured as described above will be described with reference to FIGS. 17 and 18.

In the accompanying drawings, when a pin distortion phenomenon, which is represented by a dotted line in the areas of the second point P2 and the fourth point P4, occurs, the magnetic field of the horizontal correction coils L1 and L2 is caused by the current flowing in the horizontal deflection circuit. Is generated and the inductance values L of the pair of horizontal correction coils L1 and L2 that are previously provided are dropped due to the fixed bias magnetic field of the pair of magnets 2 and 3.

In addition, the variable bias generated in the vertical correction coil L3 cancels in the direction opposite to the magnetic field direction of the pair of magnets 2 and 3, thereby causing a difference in the upper and lower inductance values L, resulting in a difference in the size of the upper and lower pins. This is the reason why P2 and P4 are corrected (the part processed by the thin dotted line disappears).

However, in the conventional pin distortion correction method as described above, since the respective horizontal correction coils and the vertical correction coils must be wound on a plurality of cores, the productivity is lowered, and as the occurrence of dispersion due to the winding of the coil increases, There are problems that the distribution and characteristics of the middle pin are unstable and unnecessary power consumption increases as additional correction circuits are installed.

That is, in the accompanying drawings, each of the components of each core has a gap (Gap) generated by the repulsive force generated by its own electromagnetic force, and the above-described problems are caused by the power consumption.

Accordingly, the present invention has been proposed to solve the above-described problems of the prior art, and an object of the present invention is to extend the effective electric field in a specific direction at an angle corresponding to a specific area of the screen band portion diagonal of the horizontal deflection coil, thereby providing The present invention provides a method of correcting the middle pin distortion of a middle part using a horizontal deflection coil and a deflection yoke, which can improve pincushion, improve productivity, reduce cost, and improve quality.

Self-intermediate pin distortion correction method using a horizontal deflection coil of the present invention for achieving the above object,

It is divided into a neck part and a screen vent part, and an extension part connecting the neck part and the screen band part, and is installed on the inner circumferential surface of the coil separator of the deflection yoke and has a horizontal deflection coil which generates a horizontal deflection magnetic field to correct the pin distortion of the screen. The method further comprises: dividing the screen band portion of the horizontal deflection coil into quadrants, and extending the effective length of a specific portion of the extension portion located in the screen vane portion diagonal direction of each quadrant close to the plane of the rear surface of the screen band portion. Generating a pincushion in the corner area of the screen; Compensating the entire pincushion of the screen by adjusting the deflection control circuit of the display set to correct the pincushion generated in the above step and the inner inner pin phenomenon of the middle portion of the screen.

In addition, the present invention, the middle pin distortion correction method using the horizontal deflection coil, the range of the section extending the length of the effective length of the horizontal deflection coil is 28 ° to 42 when the X axis of the divided quadrant of the screen band portion It is another feature that it exists in the position angle range of °.

In addition, the present invention, the middle pin pin distortion correction method using the horizontal deflection coil, the extension length to extend the length of the effective length for a specific portion of the horizontal deflection coil is in the range of 3% to 10% of the total length of the horizontal deflection coil. It is another feature to do.

The deflection yoke of the present invention comprises: a coil separator comprising a neck portion which is formed from a screen portion, a rear cover portion and a rear cover portion located on the screen surface of the cathode ray tube and coupled to an electron gun portion of the cathode ray tube; A vertical deflection coil installed on an outer circumferential surface of the coil separator to generate a vertical deflection magnetic field; The length of the effective length of a specific portion of the extension part, which is composed of a screen band part, an extension part, and a neck band part, is installed on the inner circumferential surface of the coil separator to generate a horizontal deflection field, and is located in the diagonal direction of the screen band part of the front view from the screen side. A horizontal deflection coil which extends so as to be close to the rear surface XY plane of the screen band part and changes the distortion pattern of the screen corner part; It is characterized in that it comprises a ferrite core is installed on the outer peripheral surface of the coil separator to strengthen the deflection magnetic field.

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

First, a brief description of the technical concept applied in the present invention, the deflection yoke is provided with a pair of coil separators are combined symmetrically up and down, and the coil separator insulates the horizontal deflection coil and the vertical deflection coil and At the same time, it is provided to assemble their position to a sufficient degree, the neck coupled to the screen surface side of the cathode ray tube and the rear cover portion and the neck formed integrally extending from the rear surface of the rear cover portion is coupled to the electron gun portion of the cathode ray tube It consists of wealth.

The inner and outer circumferential surfaces of the coil separator as described above are provided with a horizontal deflection coil and a vertical deflection coil for forming a horizontal deflection magnetic field and a vertical deflection magnetic field by power applied from the outside. In addition, a pair of ferrite cores are installed to surround the vertical deflection coil and formed of a magnetic material to reinforce the magnetic field generated from the vertical deflection coil.

In addition, a printed circuit board equipped with a circuit for misconvergence correction is installed on one side of the rear cover portion of the deflection yoke.

On the other hand, Figure 19 shows a conventional horizontal deflection coil. The horizontal deflection coil is installed in a coil separator (not shown) on which a printed circuit board is mounted. The neck portion 11, which is provided on the inner circumferential surface of the coil separator, uses the same term as the neck portion of the coil separator. However, each neck portion designation position is different) and the screen bent portion 10 and the extension portion 13 which connects the neck portion 11 and the screen vent portion 10 is divided. Here, reference numeral 12 denotes a window.

At this time, substantially the biasing force is generated in the extension portion 13, in order to maintain the biasing force uniformly, the length of the extension portion 13 from the neck portion 11 to the screen vent portion 10 uniformly I keep it.

Therefore, in the present invention, in order to eliminate the inner pin distortion phenomenon, the extension part 13 is the screen band part 10 in order to prevent the distortion phenomenon through the overall screen compensation by forcibly distorting the portion where the actual inner pin distortion does not occur. By deforming the length of a specific part at the part connected to), pincushion shape is forcibly generated in the corner area of the screen, and this can be suppressed by the control of the horizontal deflection control circuit for pincushion adjustment of the entire screen. It is.

That is, as shown in FIG. 20, a uniform section β in which the inclination angle is changed is present at the connection portion between the extension part 13 and the screen vent part 10. In the present invention, the inner pin In order to solve the distortion phenomenon, a portion of the uniform section β is deformed in order to forcibly distort the portion where the actual inner pin distortion does not occur so as to prevent distortion through overall screen compensation.

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

As shown in FIG. 21, the present invention provides a horizontal deflection coil that most influences distortion of a screen, and is positioned horizontally in a diagonal direction of the screen bent part 10 of the front side viewed from the screen side. The length of the extension corresponding to the specific section of the coil is extended to have a separate section α in addition to the uniform section β.

That is, as shown in FIG. 22, the angle of a specific section of the horizontal deflection coil located in the diagonal direction of the screen band part 10 on the front side of the deflection yoke, which has the greatest influence on the distortion of the screen, is seen from the screen side. At (θ1≤θ≤θ2), an extension section α is formed so that the effective electric field is close to the XY plane, which increases the X-axis deflection force of a specific region so that only the distortion pattern of the corner portion is mainly changed. will be.

In this case, the extending section range θ of the horizontal deflection coil is formed to be within a range of 28 ° to 42 ° position angle with respect to the X axis when the screen band portion of the deflection yoke is divided into quadrants.

In this case, the length of the extension portion of the extending horizontal deflection coil is referred to by reference numeral α, and referring to the accompanying FIG. 21, the range of the length "α" of the extended coil according to the present invention is referred to by reference numeral L. 3% to 10% of the total length of the entire coil.

As shown in FIGS. 21 and 22, the horizontal deflection located in the diagonal direction of the screen band part 10 on the front side of the deflection yoke which most affects the distortion of the screen as viewed from the screen side. The effect of extending a particular portion of the coil to approximate the plane of the backside of the screen bent part 10 is as shown in FIGS. 23 to 25.

That is, in the pincushion state of the middle part, which is a problem when contrasting left and right, as shown in FIG. 23 attached to the screen when the middle pincushion is not removed, the bones shown in the attached FIGS. 21 and 22 Application of the method of self-intermediate pin distortion correction using the horizontal deflection coil according to the present invention increases the deflection force of only the portion indicated by reference numeral A in FIG. 24 and consequently results from the conventional deflection force adjustment circuit of the display set. The overall left and right pincushion is improved as shown in FIG.

That is, according to the present invention, the pincushion phenomenon occurs only in the middle of the circuit, based on the conventional horizontal deflection control circuit provided in the display set. In order to compensate for this, the deflection magnetic field on the horizontal X-axis of the horizontal deflection coil is strengthened on the screen. After the pincushion phenomenon is forcibly generated in the corner region, the pin cushion of the entire screen can be suppressed only by the control of the usual horizontal deflection control circuit as described above.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention as set forth in the claims. Anyone who has a can easily know.

As described above, the self-intermediate pin distortion correction method using the horizontal deflection coil and the deflection yoke according to the present invention may include additional circuits as in the prior art in order to suppress the phenomenon of middle pincushion of the screen. There is no need to reduce the production cost, and there is an effect that can reduce the power consumption by not using a circuit for pincushion suppression.

In addition, in the prior art, as the occurrence of the dispersion along the winding of the coil increases, there is an effect that the problem that the dispersion and stabilization of characteristics of the middle pin cannot be stabilized can be solved.

1 is a side view showing a typical cathode ray tube.

2 is a front sectional view showing a saddle-saddle deflection yoke according to the prior art.

3 is a plan sectional view of FIG.

4 to 15 are examples of misconvergence and geometric distortion patterns on a screen in a deflection yoke according to the prior art.

Fig. 16 is a circuit diagram showing an example of a conventional middle pin distortion correction device.

Fig. 17 is a side view of an example of main components of an intermediate pin distortion correction reactor used in a conventional intermediate pin distortion correction device;

18 is an exemplary view of a screen during conventional middle pin distortion correction.

19 is a perspective view of a general horizontal deflection coil.

20 is a perspective view of a main portion of a conventional horizontal deflection coil;

21 is a partial perspective view of a horizontal deflection coil for applying the middle pin distortion correction method according to the present invention.

Figure 22 is an exemplary view for explaining the length extension section of the effective length of the horizontal deflection coil according to the present invention.

23 to 25 are exemplary diagrams for explaining the pin distortion correction effect according to the middle pin distortion correction method according to the present invention.

Claims (6)

In the method of correcting the pin distortion of the screen having a horizontal deflection coil which is divided into a neck part, a screen band part, and an extension part connecting them, and installed on upper and lower inner peripheral surfaces of the coil separator of the deflection yoke to generate a horizontal deflection magnetic field. The screen band part of the horizontal deflection coil is divided into quadrants, and the length of the effective length of a specific portion of the extension part located in the diagonal direction of the screen band part of each section extends closer to the plane of the rear surface of the screen band part so as to be on the edge of the screen. Generating a pincushion in the region; Compensating the entire pincushion of the screen by adjusting the deflection control circuit of the display set to correct the pincushion generated in the step and the inner pin of the screen itself, The range of the section extending the length of the effective electric field of the horizontal deflection coil is within the position angle range of 28 ° to 42 ° based on the X axis of the divided quadrant of the screen band part, The extension length extending the length of the effective electric field for a specific portion of the horizontal deflection coil is 3 to 10% of the total length of the total horizontal deflection coil, the middle pin pin distortion correction method using the horizontal deflection coil . delete delete A coil separator comprising a neck portion which is formed on the screen surface of the cathode ray tube, a rear cover portion, and a neck portion which extends from the center surface of the rear cover portion and is coupled to the electron gun of the cathode ray tube; A vertical deflection coil installed on an outer circumferential surface of the coil separator to generate a vertical deflection magnetic field; The length of the effective length of a specific portion of the extension part, which is composed of a screen band part, an extension part, and a neck band part, is installed on the inner circumferential surface of the coil separator to generate a horizontal deflection field, and is located in the diagonal direction of the screen band part of the front side as viewed from the screen side. A horizontal deflection coil which extends so as to be close to the rear surface XY plane of the screen band part and changes the distortion pattern which is a screen corner part; A ferrite core installed on an outer circumferential surface of the coil separator to strengthen a deflection magnetic field; The range of the section extending the length of the effective electric field of the horizontal deflection coil is provided within the position angle range of 28 ° to 42 ° based on the X axis of the divided quadrant of the screen band part, And an extension length extending the length of the effective electric field with respect to a specific portion of the horizontal deflection coil is in the range of 3% to 10% of the total length of the horizontal deflection coil. delete delete