KR100719087B1 - In-line electron gun of cathode ray tube - Google Patents

Abstract

The present invention provides a three-pole portion comprising a control electrode and an acceleration electrode for controlling and accelerating the amount of electron beams emitted from a plurality of cathodes, an electrode acting as a shear-focusing lens by focusing the electron beam by a predetermined amount, and focusing the electron beam on a screen. In an electron gun composed of a plurality of focusing electrodes acting as a main lens, an electrode which receives a dynamic voltage among the electrodes serving as the main lens is installed in a direction perpendicular to the radiation path of the electron beam in an inner space thereof. A guide electrode which prevents the traveling path of each electron beam from being converted, a 'c'-shaped protruding blade which is formed in a plurality of side through hole portions of the guide electrode and is opened toward the central hole, and protrudes in the traveling direction of the electron beam, and the It is installed in the center through hole of the guide electrode, and is installed at the top and bottom respectively based on the center through hole. Comprising a '-' shaped protruding blade protruding in the direction of the beam, forming a correction blade of a certain dimension inside the dynamic electrode receiving a dynamic voltage to apply an electric field of a certain intensity and by this electric field By making the side beams deflect in the center direction, the electron beam is compensated to minimize the amount of beams moved by the dynamic parabola voltage before entering the main lens, thereby improving in-line electron guns of cathode ray tubes that can improve resolution across the screen. to provide.

Description

Electronic Gun of In-line Type for CRT             

1 is a side view showing a general color cathode ray tube,

2 is a view showing the configuration of an electron gun according to the prior art,

3 is a view showing a configuration of a fifth electrode of FIG. 2 according to the prior art, FIG. 3A is a side view of an electrode to which a dynamic voltage is applied, and FIG. 3B is a view showing a cross section of a guide electrode.

4 is a view showing the action of the deflection lens formed in the electron gun of FIG.

5 is a view showing the action of the dynamic lens formed in the electron gun of FIG.

6 is a view showing the action of the main lens formed in the electron gun of FIG.

7 is a view showing a detailed configuration of a fifth electrode of the electron gun according to the prior art, Figure 7a is a side view of the fifth electrode, Figure 7b is a cross-sectional view taken along the line AA 'of Figure 7a,

8 is a view showing a detailed configuration of a guide electrode according to an embodiment of the present invention, Figure 8a is an embodiment of the guide electrode correction blade, Figure 8b is another embodiment of the guide electrode correction blade,

9 is a view for explaining the effect of the guide electrode and the correction blade of FIG.

10 is a view for explaining the design dimensions of each of the correction blade of Figure 8, Figure 10a is a view showing the embodiment of Figure 8a, Figure 10b is a view showing the embodiment of Figure 8b,

FIG. 11 is a diagram for explaining the influence of the A dimension in FIG. 10. FIG.

FIG. 12 is a diagram for explaining the influence of the B dimension in FIG. 10. FIG.

Explanation of symbols on the main parts of the drawings

16: first electrode of fifth electrode 17: second electrode of fifth electrode

30: guide electrode installed in the second electrode of the fifth electrode

31, 33: Protruding blade installed in the side passage hole of the guide electrode

35, 37: Protruding blade installed in the center through hole of the guide electrode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun for a color cathode ray tube, and in particular, by forming a blade protruding inside an electrode to which dynamic voltage is applied, the trajectory of a beam generated by an alternating voltage of a dynamic parabola waveform applied when the electron beam is deflected to the periphery of the screen. The present invention relates to an in-line electron gun of a cathode ray tube capable of correcting a change amount (DSS) to increase resolution in a cathode ray tube.

The electron gun of the color cathode ray tube generally has a plurality of electron beam through holes squarely drilled in a horizontal in-line on the grid electrodes of the flat and flat surfaces, and the longitudinal and horizontal grooves are provided in the first and second grids. A plurality of formed in-line integrated grid electrodes are laminated and fused and fixed with bead glass while maintaining a distance between predetermined grid electrodes by external force, and a main part thereof is configured. The plurality of sequentially stacked grid electrodes provide a heater. A focusing electrode constituting a first grid electrode, a second grid electrode constituting an electron beam forming region for forming the hot electrons emitted from the built-in cathode into an electron beam, and a focusing focusing lens for narrowly focusing and forming an electron beam that subsequently enters; The second acceleration and focusing electrodes are arranged in order.

In addition, in order to achieve a multi-focus type with enhanced focusing effect, a third grid electrode and a fourth grid electrode for shear focusing are additionally inserted between the grid electrode constituting the electron beam forming region and the electrode constituting the electrostatic focusing lens. .

FIG. 1 is a side view illustrating a general color cathode ray tube, in which red, green, and blue phosphors are coated on an inner surface of a panel 1 to form a fluorescent surface, and an electron gun 10 is disposed on a neck portion 2 behind the panel 1. ) Funnel (3) encapsulated by glass is kept in a high vacuum state of about 10 ^-7 Torr.

The shadow mask 4, which serves as color screening of the electron beam scanned by the electron gun 10, is installed at a portion proximate to the fluorescent surface of the inner surface of the panel while being fixed to the support frame.

Further, a deflection yoke 5 is provided at the interface between the funnel 1 and the neck 2 to deflect the electron beam scanned by the electron gun to the entire fluorescent surface.

The electron gun radiating the electron beam in the cathode ray tube configured as described above is provided with a cathode 11 emitting the electron beam as a voltage is applied as shown in FIG. 2, and a first electrode 12 installed close to the cathode to control the radiation amount of the electron beam 12. ), A second electrode 13 installed close to the first electrode to accelerate the emitted electron beam, and a third (14) and a fourth installed close to the second electrode to form the electrostatic focusing lens. Fifth (16, 17) and sixth electrodes (18), which are provided in close proximity to the electrode (15) and the fourth electrode to form the electrostatic focusing lens, and are fixed to the sixth electrode to provide an external electric field and a magnetic field. The shield cup 19 is shielded, and they are kept at a constant distance from each other by the bead glass 20.

Different voltages are applied to the electrodes through the connector 23 connected through the stem pin 22 fixed to the stem 21, and the stem 21 is sealed to the neck portion.

Therefore, when power is applied from the stem pin 22 to the heater in the cathode 11 constituting the triode of the electron gun and the heater generates heat, the hot electrons are emitted from the electron emission material applied to the tip of the cathode 11.

The emitted electrons are accelerated and focused while passing through a plurality of electrodes, pass through a shadow mask 4 having a color screening function installed at a constant interval from the fluorescent surface, and then collide with the fluorescent surface to emit phosphors, thereby reproducing the screen.

In this case, in order to reproduce an image, the electron beam must be sequentially scanned over the entire area of the screen. For this purpose, a self-convergence deflection yoke 5 using a non-uniform magnetic field is applied.

3 is a cross-sectional view of a fifth electrode to which the dynamic voltage of FIG. 2 is applied, and typically illustrates a guide electrode inserted into a center portion of the second focusing electrode 17 of FIG. 2.

In general, the guide electrode 30 is formed to prevent the path change of the beam when the beam passes through the second focusing electrode 17, that is, the path of the side beams (R, B beam) is biased outward or inward. 2 is installed inside the focusing electrode 17.

4 is a view showing the action of the deflection lens formed in the electron gun of FIG. 2, the distribution of the magnetic field generated in the deflection yoke (5) using the self-focusing type can be explained by dividing into two-pole and four-pole components However, the bipolar component serves to deflect the electron beam in the horizontal or vertical direction, and the 4-pole component, that is, the DY lens, focuses the electron beam in the vertical direction and diverges in the horizontal direction, thereby generating DY astigmatism ( Astigmatism causes the beam in the vertical direction to focus at a shorter distance than the beam in the horizontal direction, causing a halo phenomenon in which the vertical direction rises convexly on the screen, resulting in deterioration of image quality.

In order to solve the above problems, the four-pole component is generated by the electron gun to cancel the four-pole component generated by the self-focusing deflection yoke so that the electron beams in the horizontal and vertical directions can be focused at one point at the same time.

In order to form a four-pole lens, the fifth electrodes 16 and 17 are divided into two, the first focusing electrode 16 and the second focusing electrode 17, and the first focusing electrode 16 has a static high and low pressure ( By applying a dynamic low voltage Vdf to the second focusing electrode 17, Vsf) generates a potential difference on the dynamic quadrupole electrode to form a quadrupole lens, thereby solving the above problem.

However, the electron beam is still focused in front of the screen due to the difference in the electron beam moving distance between the center and the peripheral portion of the screen, and the hollow phenomenon still occurs. That is, since the intensity of the non-uniform magnetic field increases toward the periphery of the screen, an electron beam spot formed of a core portion having a high electron beam density and a hollow portion having a low electron beam density is formed.

Therefore, in order to solve this problem, when the electron beam is deflected to the periphery of the screen, a dynamic voltage (variable voltage) of a parabola waveform synchronized with the deflection frequency is applied to the second focusing electrode 17 of the fifth electrode to provide the main electrostatic focusing lens. The method of solving the above problems by adjusting the focal length of the beam by reducing the intensity is mainly employed.

FIG. 5 shows the action of the lens formed by applying the dynamic parabola voltage to the second focusing electrode 17 of the fifth electrode. The dotted line shows the action when the beam is incident on the center of the screen. When the beam is incident on the periphery of the screen, the beam path is shown. When the beam is incident on the periphery of the screen, the DY lens and the dynamic lens are operated, and the intensity of the main lens is weakened.

However, when the voltage of the dynamic parabola waveform is applied, the lens action of the main lens unit is weakened, and as shown in FIG. do. Various methods have been derived to correct this shape.

As an example, referring to TV report EID 88-64, the effect of the electric field formed around the edge of the electrode to which the dynamic voltage is applied as shown in FIG. In other words, as the electric field is formed from the inside to the outside, the path of the electron beam is directed toward the center beam.

However, with the trend toward flattening and large-sized CRTs, these principles alone cannot achieve the full effect. At present, the DSS amount in the planar CRT is at least 0.2 mm to 0.5 mm even with the generalized correction scheme.

Accordingly, an object of the present invention is to form a blade protruding inside the electrode to which the dynamic voltage is applied, thereby reducing the orbital change amount (DSS) of the beam generated by the AC voltage of the dynamic parabola waveform applied when the electron beam is deflected to the periphery of the screen. It is to provide a cathode ray tube in-line electron gun that can be calibrated to increase resolution across the screen of the cathode ray tube.

Technical means of the present invention for achieving the above object, the triode portion consisting of a control electrode and an acceleration electrode for controlling and accelerating the amount of electron beam emitted from a plurality of cathodes, and focusing the electron beam by a predetermined amount to act as a shear focusing lens In the electron gun consisting of a plurality of focusing electrodes that serve as a main lens for focusing the electron beam on the screen, the electrode provided with a dynamic voltage among the electrodes serving as the main lens, the electron beam in the inner space of the A guide electrode installed in a direction perpendicular to the radial path; And a 'c' shaped protruding blade which is formed in a plurality of side passage holes of the guide electrode and is opened toward the central hole and protrudes in the traveling direction of the electron beam.

Another technical means of the present invention for achieving the above object is a tripolar portion consisting of a control electrode and an acceleration electrode for controlling and accelerating the amount of electron beams emitted from a plurality of cathodes, and focusing the electron beam by a predetermined amount to a shear-focusing lens In the electron gun composed of a plurality of focusing electrodes serving as a main lens for focusing the electron beam on the screen, the electrode which receives a dynamic voltage among the electrodes serving as the main lens, the electron beam in the inner space A guide electrode installed in a direction perpendicular to the radiation path of the; And a '-' shaped protruding blade installed at the upper and lower ends of the guide electrode, respectively, protruding in the traveling direction of the electron beam.

Another technical means of the present invention for achieving the above object is a three-pole portion consisting of a control electrode and an acceleration electrode for controlling and accelerating the amount of electron beams emitted from a plurality of cathodes, and focusing the electron beam by a certain amount of a shear-focusing lens In the electron gun consisting of a plurality of focusing electrodes that serve as a main lens for focusing the electron beam on the screen, the electrode provided with a dynamic voltage among the electrodes serving as the main lens, in the inner space A guide electrode installed in a direction perpendicular to the radiation path of the electron beam; A 'c' shaped protruding blade formed in a plurality of side passage holes of the guide electrode and opened toward the central hole and protruding in a traveling direction of the electron beam; And a '-' shaped protruding blade which is installed at the center through hole of the guide electrode and is installed at the top and the bottom of the guide electrode, respectively, and protrudes in the traveling direction of the electron beam.

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

8 is a perspective view showing a detailed configuration of a guide electrode according to an embodiment of the present invention, Figure 8a is an embodiment of the guide electrode and the correction blade, Figure 8b shows another embodiment of the guide electrode and the correction blade .

As shown in FIG. 8A, 'C'-shaped protruding blades 31 and 33 which are opened toward the central hole and protrude in the traveling direction of the electron beam are installed in the plurality of side passage holes of the guide electrode 30, or as shown in FIG. 8B. The upper and lower ends of the guide electrode 30 are respectively provided with '-' shaped protruding blades 35 and 37 which protrude in the advancing direction of the electron beam, respectively.

That is, the correction blades 31 and 33 are formed at the upper and lower ends of the side holes of the guide electrode 30 formed of three circular through holes (FIG. 8A), or the correction blades 35 and 37 are respectively formed at the upper and lower ends of the central hole. (B) and different materials so that different voltages may be applied to the upper and lower ends of each of the correction blades based on the through holes thereof, and the installation direction of the correction blades is toward the cathode side or the screen side. .

In order to further improve the effect, except for the i plane which is a plane perpendicular to the electron beam passing hole, the remaining portion is formed to form an insulating film to suppress the field emission.

FIG. 8 illustrates the formation of the DSS correction blades 31, 33, 35, and 37 on the guide electrode 30. Referring to FIG.

FIG. 9A shows the case of FIG. 8A and FIG. 9B shows the case of FIG. 8B, in which electric fields are formed by the blades having different conductivity, and the side beams of FIG. As shown in (c), the deflection in the direction of the center beam is corrected.

That is, as described in the prior art, the dynamic parabola voltage is applied, thereby decreasing the intensity of the main lens and changing the path of the beam inward before the beam is incident on the main lens in order to correct the amount of DSS generated by the main lens.

In addition, the specific dimensions of the DSS correction blade (31, 33, 35, 37) are described in detail in Table 1 below and FIG.

DSS correction blade dimensions (unit [mm]) part T A B C D size 0.4 to 0.8 1 to 2.5 3 to 7.5 4 to 6 4 to 17

As shown in Table 1 and FIG. 10A, the protruding blades 31 and 33 provided in the guide electrode 30 have a protruding length A in the traveling direction of the electron beam in the range of 1 to 2.5 mm, and the horizontal direction of the guide electrode. Therefore, it is preferable to define the horizontal length in the range of 3 to 7.5 mm and the vertical length C in the vertical direction of the guide electrode in the range of 4 to 6 mm. Referring to Table 1 and FIG. The protruding blades 35 and 37 provided at the upper and lower ends of the through-holes have a length A of the protruding blades in the traveling direction of the electron beam in the range of 1 to 2.5 mm, and the horizontal length D of the guide electrodes in the horizontal direction. In the range of 4 to 17 mm, it is preferable to define the separation distance (C) of the protruding blades respectively installed at the upper end and the lower end of the through hole in the range of 4 to 6 mm.

In addition, the diameter of the passage hole through which the electron beam passes is standardized to 4.0 mm in diameter.

When the dimension of the DSS correction blade is out of its design value, i.e., outside the upper limit value, the effect of the electric field becomes stronger, affecting the center beam through hole, and horizontally deforming the electron beam passing through the center hole to reduce the resolution on the screen. It may cause, and the effect will be lost if it is below the lower limit of each dimension.

The present invention provides an electron gun for a color cathode ray tube that improves the screen resolution of a color cathode ray tube, and is a structure created to 'zero' the amount of DSS generated when a dynamic parabola voltage is applied, and guides the inside of the dynamic electrode. The electrode 30 and the correction blades 31 and 33 (35 and 37) are formed to form an electric field for correcting the trajectory of the electron beam, thereby improving the resolution over the entire screen area.

In addition, in order to stabilize the grade in preparation of a correction blade, it is preferable to set thickness T of a material to 0.4-0.8 mm.

Looking at the effect of each dimension in the present invention, first look at the DSS amount according to the change of the dimension A shown in Fig. 11, when the size of the DSS is changed only when the A dimension is fixed in the rest of the dimensions A dimension 1.0mm It can be seen that the sharp change when less than or equal to 2.5mm.

In addition, as shown in FIG. 12, when the length is 7.5 mm or more, the influence of the electric field is transmitted to the center beam, and the electron beam passing through the center hole becomes horizontal, so that the center beam and the side are on the screen. There is a problem in that the resolution is lowered due to the difference in the horizontal size between the beams of 20% or more, so that the B dimension is determined not to exceed 7.5 mm or more, and the C dimension is 4 to optimize the influence without covering the passage hole of the electron beam. It is set in the range of 6 mm.

Accordingly, in the present invention, a blade having a predetermined dimension is formed inside the dynamic electrode provided with the dynamic voltage so that an electric field of a certain intensity is applied, and the side beam is deflected toward the center by the electric field so that the electron beam is applied to the dynamic parabola voltage. By correcting the amount of beam to be moved to minimize the incident before the main lens, there is an effect that can improve the resolution across the screen.                     

Claims (9)

A triode comprising a control electrode and an acceleration electrode for controlling and accelerating the amount of electron beams emitted from a plurality of cathodes, an electrode acting as a shear focusing lens by focusing the electron beam by a predetermined amount, and a main for focusing the electron beam on the screen. In the electron gun composed of a plurality of focusing electrodes acting as a lens, Among the electrodes acting as the main lens, an electrode provided with a dynamic voltage, A guide electrode installed in the inner space in a direction perpendicular to the radiation path of the electron beam; And The in-line electron gun of the cathode ray tube, characterized in that formed in the plurality of side through-hole portion of the guide electrode is opened toward the central hole, each comprising a 'c'-shaped protruding blade protruding in the traveling direction of the electron beam. The method of claim 1, Protruding blade provided on the guide electrode, The protruding length in the traveling direction of the electron beam is in the range of 1 to 2.5 mm, the horizontal length in the horizontal direction of the guide electrode is in the range of 3 to 7.5 mm, and the vertical length in the vertical direction of the guide electrode is 4 to 6 mm. An in-line electron gun of a cathode ray tube, characterized by the range. A triode comprising a control electrode and an acceleration electrode for controlling and accelerating the amount of electron beams emitted from a plurality of cathodes, an electrode acting as a shear focusing lens by focusing the electron beam by a predetermined amount, and a main for focusing the electron beam on the screen. In the electron gun composed of a plurality of focusing electrodes acting as a lens, Among the electrodes acting as the main lens, an electrode provided with a dynamic voltage, A guide electrode installed in the inner space in a direction perpendicular to the radiation path of the electron beam; And It is installed in the center through-hole portion of the guide electrode, and installed on the upper and lower sides with respect to the center through-hole respectively, characterized in that it comprises a '-' shaped protruding blade protruding in the traveling direction of the electron beam -Line gun. The method of claim 3, wherein Protruding blades installed on the top and bottom of the central passage hole, The length of the protruding blade in the traveling direction of the electron beam is in the range of 1 to 2.5 mm, and the horizontal length in the horizontal direction of the guide electrode is in the range of 4 to 17 mm. An in-line electron gun of a cathode ray tube, characterized in that the distance is defined in the range of 4 to 6 mm. A triode comprising a control electrode and an acceleration electrode for controlling and accelerating the amount of electron beams emitted from a plurality of cathodes, an electrode acting as a shear focusing lens by focusing the electron beam by a predetermined amount, and a main for focusing the electron beam on the screen. In the electron gun composed of a plurality of focusing electrodes acting as a lens, Among the electrodes acting as the main lens, an electrode provided with a dynamic voltage, A guide electrode installed in the inner space in a direction perpendicular to the radiation path of the electron beam; A 'c' shaped protruding blade formed in a plurality of side passage holes of the guide electrode and opened toward the central hole and protruding in a traveling direction of the electron beam; And It is installed in the center through-hole portion of the guide electrode, and installed on the upper and lower sides with respect to the center through-hole respectively, characterized in that it comprises a '-' shaped protruding blade protruding in the traveling direction of the electron beam -Line gun. The method according to claim 3 or 5, An in-line electron gun of a cathode ray tube, characterized in that the protruding blades respectively formed at the top and the bottom of the through hole are different in conductivity. The method according to any one of claims 1, 3 and 5, An in-line electron gun of a cathode ray tube, characterized in that the thickness of the protruding blade is defined in the range of 0.4 to 0.8 mm. The method according to any one of claims 1, 3 and 5, An in-line electron gun of a cathode ray tube, wherein an insulating film for suppressing field emission is formed on a part or the entire surface of the protruding blade. The method according to any one of claims 1, 3 and 5, The protruding blade, In-line electron gun of the cathode ray tube, characterized in that provided on the cathode side or the screen direction side of the guide electrode.

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