KR20030077352A - Super slim cathode ray tube - Google Patents

Abstract

PURPOSE: An ultra-slim cathode ray tube is provided to achieve improved screen quality, luminance, contrast and color purity by controlling the trajectory of electron beam, while reducing the thickness and weight of the cathode ray tube. CONSTITUTION: A panel(10) includes a surface on which a phosphor screen(12) is formed. A funnel(20) is attached to the rear end of the panel so as to form an internal vacuum. An electron gun(40) radiates electron beams. A deflection yoke(50) deflects the electron beam radiated from the electron gun. An electron beam deflection magnet(70) includes a solenoid structure and secondarily deflects the electron beam primarily deflected by the deflection yoke toward the front surface of the phosphor screen.

Description

Super slim cathode ray tube {SUPER SLIM CATHODE RAY TUBE}

The present invention relates to a cathode ray tube, and more particularly, to further deflect an electron beam emitted from an electron gun, to improve image quality and color clarity of a screen, and to reduce an electric field length to achieve ultra slim and ultra light weight. will be.

Generally, a cathode ray tube (CRT) is a special vacuum tube that converts an electric signal emitted from an electron gun into an optical image such as an image, a figure, or a character by the action of an electron beam, and selectively displays a fluorescent mask on a rear surface of a panel through a shadow mask. Landing is performed to display an image.

1 is a side view illustrating a conventional cathode ray tube, and FIG. 2 is a front view illustrating an image formation state during electron beam emission of the conventional cathode ray tube of FIG. 1.

Looking at the configuration of the conventional cathode ray tube 1 with reference to Figure 1, a panel 10 having a fluorescent surface 12 formed therein, a funnel 20 fused to the rear end of the panel 10 to form an internal vacuum, and An electron gun 40 embedded in the neck portion 30 of the rear end of the funnel 20 to emit the electron beam B, and a deflection yoke 50 to radially deflect the electron beam B emitted from the electron gun 40. And a shadow mask 60 through which the electron beam B selects a color through the slit hole 62 so as to emit a predetermined phosphor on the phosphor surface 12.

Looking at the operation relationship of the conventional cathode ray tube 1 having such a configuration, first, the electron beam B emitted from the electron gun 40 is radially deflected by the deflection yoke 50 so that the slit hole of the shadow mask 60 62 passes through the slit hole 62, and the electron beam B passes through a predetermined phosphor on the phosphor surface 12 corresponding to each hole 62, thereby emitting light. The image is reproduced on the screen 14 on the outer surface.

In the conventional cathode ray tube 1 operated as described above, as shown in FIGS. 1 and 2, the point where the electron beam B radiated from the electron gun 40 starts to be deflected by the deflection yoke 50 is obtained. The deflection center S is referred to, and a predetermined angle formed by connecting the outermost pixels of the screen 14 with respect to the deflection center S is referred to as a maximum deflection angle θ.

In the case of the conventional cathode ray tube 1, as the size of the screen 14 increases, the deflection center S of the electron beam B moves toward the vehicle model 40 by a ratio of increasing the size of the screen 14. In other words, in order to obtain the same image quality as the screen of the previous size in the enlarged screen 14, an electron beam spot P having the same size as before is required. For this purpose, the electron beam B incident on the screen 14 is The same angle of incidence as before the change of the size of the screen 14 is achieved. For this purpose, the deflection center S of the electron beam B is moved toward the electron gun 40. This increases the traveling distance D1 of the electron beam B 'from the deflection center S to the screen 14, resulting in a problem that the overall length D of the cathode ray tube 1 becomes long.

As such, the conventional cathode ray tube 1 has a long length D when the size of the screen 14 is increased, which makes it difficult to install and use in a limited area, and other flat panel displays due to an increase in overall volume and load. It is less competitive than the device.

In addition, in the conventional cathode ray tube 1, the landing angle θ1 of the electron beam B incident thereto is gradually decreased from the center of the screen 14 to the outside thereof, which will be described with reference to FIG. 2. .

As shown, looking at the shape of the beam spot P in the fluorescent surface 12 which is the arrival position of the electron beam B deflected by the deflection yoke 50, the center of the fluorescent surface 12 forms a rounded circle. On the other hand, it gradually extends in the radial direction from the center toward the outside, and at the outermost angle, the beam spot P forms an elongated ellipse structure.

In this case, as the beam spot P increases, color blurring occurs between pixels, and the problem of color blurring is a decrease in contrast, white uniformity, and color purity of the screen 14. In the end, there was a problem of lowering the quality.

The present invention has been invented to solve the problems of the prior art as described above, and includes an electron beam deflection magnetic material for increasing the landing angle of the electron beam incident on the screen by deflecting the electron beam in a direction that is directed to the fluorescent surface. It is an object of the present invention to provide an ultra-slim cathode ray tube that can prevent and reduce the traveling distance of the electron beam.

1 is a side view showing a conventional cathode ray tube

FIG. 2 is a front view illustrating an image formation state during electron beam emission of the conventional cathode ray tube of FIG. 1.

Figure 3 is a front view showing the schematic configuration and magnetic field direction of the present invention ultra-slim cathode ray tube

Figure 4 is a side view showing the configuration of the cathode ray tube according to Figure 3 and the traveling state of the electron beam

FIG. 5 is a front view illustrating an image consolidation state during electron beam emission of the cathode ray tube according to FIG. 3; FIG.

Figure 6a is a diagram showing the experimental results for the change in the landing angle of the electron beam compared to the current intensity in the cathode ray tube of the present invention

Figure 6b is a diagram showing the experimental results for the change in the landing position of the electron beam compared to the current intensity in the cathode ray tube of the present invention

* Description of the symbols for the main parts of the drawings *

1,1 ': cathode ray tube 10: panel

12 fluorescent screen 14 screen

20: Funnel 30: Neck part

40: electron gun 50: deflection yoke

60: shadow mask 62: slit holes

70 electron beam deflection magnetic material 72 coil

74: magnetic core B, B ': electron beam

D, D ': Overall length D1, D'1: Mileage

P, P ': Beam spot S, S': Center of deflection

M: magnetic field θ: maximum deflection angle

θ1, θ2: Landing angle

The present invention for achieving the above object is a panel formed with a fluorescent surface on one side, a funnel fused to the rear end of the panel to form an internal vacuum, an electron gun to emit an electron beam, and to deflect the electron beam emitted from the electron gun A cathode ray tube configured to include a deflected yoke, the ultra-thin cathode ray tube further comprising an electron beam deflection magnetic material having a solenoid structure for secondary deflection of the electron beam primarily deflected by the deflection yoke to the front of the fluorescent surface. To provide.

As a specific example of the present invention, the electron beam deflection magnetic material is located between the deflection yoke and the panel.

The present invention more specifically, the electron beam deflection magnetic material is characterized in that provided on at least one of the inner surface and the outer surface of the funnel.

In the present invention, the electron beam deflection magnetic material is provided with a plurality, characterized in that arranged side by side facing each other.

In the present invention, the electron beam deflecting magnetic material is characterized in that the upper and lower left and right of the funnel, respectively.

In the present invention, the electron beam deflection magnetic material is characterized in that it is installed in the upper and lower corners of the funnel.

In the present invention, the electron beam deflection magnetic body is characterized in that the magnetic core provided inside the coil to form a high-strength magnetic field is composed of a ferrite core.

In the present invention, the electron beam deflecting magnetic material is characterized in that the magnetic core is installed in the vertical direction of the funnel so that the magnetic field acts in the vertical direction of the funnel to deflect the electron beam.

As described above, the present invention forms a predetermined magnetic field region by applying a DC current to the electron beam deflection magnetic material provided on the surface of the funnel, and deflects the electron beam passing through the secondary to increase the landing angle of the electron beam incident on the screen. By controlling the trajectory, it is possible to further improve image quality, brightness, contrast and color sharpness on the screen, as well as to reduce the traveling length of the electron beam, thereby reducing the total length of the cathode ray tube, thereby achieving ultra slim and ultra light weight of the cathode ray tube. Will be.

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

Since the overall configuration and operation relationship of the cathode ray tube to which the present invention is applied are the same as in the prior art, the repeated description thereof will be omitted, and the same reference numerals will be given as in the prior art, and only new components will be given the new reference numerals.

Figure 3 is a front view showing the schematic configuration and magnetic field direction of the present invention ultra-thin cathode ray tube, Figure 4 is a side view showing the configuration of the cathode ray tube according to Figure 3 and the traveling state of the electron beam, Figure 5 It is a front view which shows the image consolidation state at the time of electron beam emission of the cathode ray tube which concerns on 3.

As shown in FIG. 4, the ultra-slim cathode ray tube 1 'of the present invention has a direction in which the electron beam B' primarily deflected by the deflection yoke 50 is directed to the fluorescent surface 12 of the panel 10 in a straight line. In order to deflect the vehicle, the electron beam deflecting magnetic body 70 is provided.

The electron beam deflection magnetic material 70 is a solenoid structure in which the coil 72 is wound, and is installed at a predetermined position between the deflection yoke 50 and the panel 10, which may be installed on an outer surface or an inner surface of the funnel 20. . In addition, the electron beam deflection magnetic material 70 is provided in the upper and lower left and right sides of the funnel 20, as shown in Figure 3 and 4, the upper and lower corners of the funnel 20, Preferably, in order to deflect the electron beam B ', the magnetic core 74 is installed to face the vertical direction of the funnel 20 so that the magnetic field M acts in the vertical direction of the funnel 20.

Next, an operation relationship of the ultra slim cathode ray tube 1 'according to the present invention will be described with reference to the drawings.

When a DC current flows through the electron beam deflection magnetic material 70 installed at the left, right, top and bottom ends of the funnel 20, a magnetic field M is formed around each electron beam deflection magnetic material 70 as shown in FIG. 3. The magnetic field (M) acts in the vertical direction of the funnel by the Fleming's left-hand law, affecting the internal space of the funnel 20, which is the traveling path of the electron beam B '.

At this time, the electron beam B ′ emitted from the electron gun 40 is firstly deflected from the deflection center S of the magnetic field region formed by the deflection yoke 50 at the rear end of the funnel 20, and then through the inner space of the funnel 20. The electron beam B 'passes through a predetermined magnetic field region inside the funnel 20 in which the magnetic field M is formed before reaching the fluorescent surface 12.

In this process, as illustrated in FIG. 4, the electron beam B ′ is secondarily deflected in the direction directed toward the fluorescent surface 12 by collecting the magnetic beam M in the maximum inward direction.

As described above, the second deflected electron beam B ′ that is directed toward the fluorescent surface 12 has a larger landing angle θ2 incident on the screen 14, thereby controlling the trajectory of the electron beam B ′. Thus, the brightness and contrast on the screen 14 may be improved to further improve image quality.

Further, the shape of the beam spot P 'at the fluorescent surface 12, which is the beam arrival position of the secondary deflected electron beam B' straight toward the fluorescent surface 12, is rounded as shown in FIG. It has a circular shape, from which color bleeding is prevented between the pixels of the screen 14, so that the color sharpness can be further increased.

Although not shown, the present invention may be provided in a structure in which the electron beam deflection magnetic material 70 is simultaneously attached to the inside and the outside of the funnel 20 in order to increase the degree of deflection of the electron beam B 'by increasing the strength of the magnetic field M. have. In addition, the electron beam deflecting magnetic body 70 may be provided in a structure that surrounds the circumferential surface in a state in close contact with one side of the funnel 20.

In addition, the electron beam deflecting magnetic material 70 may be formed of a ferrite core (Ferrite core) does not cause a loss due to the eddy current of the magnetic core 74 provided in the coil 72, in this case high strength even with a small current Since the magnetic field M can be formed, power consumption can be reduced eventually.

On the other hand, the present invention can shorten the traveling distance D'1 of the electron beam B 'from the deflection center S' of the electron beam B 'to the fluorescent surface 12, thereby reducing the screen 14 of the same size. Compared with the conventional cathode ray tube 1 having, the electric field length D 'can be significantly reduced.

As a result, the present invention can provide an ultra-lightweight, ultra-slim cathode ray tube with significantly reduced volume and load compared to the screen size.

Figure 6 is a diagram showing the experimental results of the landing state of the electron beam using the ultra-slim cathode ray tube of the present invention, Figure 6a shows a change in the landing angle of the electron beam compared to the current intensity, Figure 6b is an electron beam compared to the current intensity Indicates a change in landing position.

It is well known that the angle of incidence of the electron beam in the screen decreases from the center of the screen to the outside, and the electron beam is mainly affected by the magnetic field in the Y-axis direction. In the ultra-slim cathode ray tube 1 'of the present invention, the funnel 20 is used. By installing the electron beam deflection magnetic material 70 at the upper and lower ends of the left and right sides, preferably at each corner portion, the deflection degree of the electron beam B 'is increased toward the corner portion of the funnel 20 so that the electron beam incident on the screen 14 ( The landing angle θ2 of B ') can be increased. 6A and 6B, while increasing the intensity of the DC current supplied to each of the electron beam deflecting magnetic bodies 70, the degree of deflection of the electron beam is gradually increased, and the landing angle on the screen is further increased. Landing distance can also be reduced.

As described above, the present invention forms a predetermined magnetic field region by applying a DC current to the electron beam deflection magnetic material provided on the surface of the funnel, and secondly deflects the electron beam passing therethrough so that the landing angle of the electron beam incident on the screen becomes larger. By controlling the trajectory of the electron beam, the image quality, brightness, contrast, and color sharpness of the screen can be further increased, and the traveling distance of the electron beam can be reduced to reduce the overall length of the cathode ray tube, thereby achieving ultra slim and ultra light weight. Will be.

Claims (8)

In a cathode ray tube comprising a panel having a fluorescent surface on one side, a funnel fused to the rear end of the panel to form an internal vacuum, an electron gun to emit an electron beam, and a deflection yoke to deflect the electron beam emitted from the electron gun. , And an electron beam deflection magnetic material having a solenoid structure for secondarily deflecting the electron beam primarily deflected by the deflection yoke to the front of the fluorescent surface. The method of claim 1, And the electron beam deflecting magnetic body is located between the deflection yoke and the panel. The method of claim 1, The electron beam deflecting magnetic material is an ultra-slim cathode ray tube, characterized in that provided on at least one surface of the inner surface and the outer surface of the funnel. The method according to claim 1 or 3, The electron beam deflection magnetic body is provided with a plurality, ultra-thin cathode ray tube, characterized in that installed side by side facing each other. The method according to claim 1 or 3, The electron beam deflecting magnetic material is a super slim cathode ray tube, characterized in that installed in the upper and lower left and right of the funnel respectively. The method of claim 5, The electron beam deflecting magnetic material is a super slim cathode ray tube, characterized in that installed in the upper and lower corners of the funnel. The method of claim 1, The electron beam deflecting magnetic body is an ultra-slim cathode ray tube, characterized in that the magnetic core provided in the coil to form a magnetic field of high strength to form a ferrite core. The method according to claim 1 or 7, The electron beam deflection magnetic body is characterized in that the ultra-thin cathode ray tube, characterized in that the magnetic field is installed in the vertical direction of the funnel so that the magnetic field acts in the vertical direction of the funnel to deflect the electron beam.