WO2002021562A1

WO2002021562A1 - Display based on miniaturized multiple cathode-ray injector

Info

Publication number: WO2002021562A1
Application number: PCT/KR2001/001495
Authority: WO
Inventors: Ho Seob Kim; Seung Joon Ahn; Dae Wook Kim
Original assignee: Cebt Co., Ltd.
Priority date: 2000-09-04
Filing date: 2001-09-04
Publication date: 2002-03-14
Also published as: AU2001286289A1

Abstract

The invention relates to a display based on miniaturized multiple cathode-ray injector comprising a glass tube consisting of a screen as a fluorescent screen. The glass tube is a flat type and is divided into plurality unit screen which is arranged having a desired size. Each miniaturized cathode-ray injector receives the control signal from a multi-image controller and scans cathode-ray beams to the screen so that the screen can display images. According to the invention, the distance between the cathode-ray injector and the unit screen is minimized so that a flat-typed display having a thin thickness can be produced.

Description

DISPLAY BASED ON MINIATURIZED MULTIPLE CATHODE-RAY

INJECTOR

Technical Field

The present invention relates generally to a display using multiple miniaturized cathode-ray scanners, and more particularly to a display using multiple miniaturized cathode-ray scanners, in which a screen is divided into unit screens each having a predetermined size and each of the miniaturized cathode- ray scanners is arranged behind a corresponding unit screen, so the distance between the miniaturized cathode-ray scanners and the unit screens can be minimized and the screen can have a flat structure, thereby allowing the fabrication of a thin flat display, and the fabrication of small-sized and large- sized displays by changing the arrangement of the unit screens.

Background Art

In general, a cathode-ray tube is representative of a display for scanning a cathode ray. The cathode ray tube is a vacuum tube for scanning a cathode ray, and is called a Braun tube or CRT.

The cathode-ray tube (or Braun tube) is widely used for displaying images and observing electrical phenomena by deflecting a cathode ray using an electric or a magnetic field. In particular, the cathode ray tube for displaying images accelerates a cathode ray scanned by an electron gun and brings it into collision with a fluorescent surface 12 using a magnetic field.

The cathode ray tube for displaying images, as shown in Fig. 1, is comprised of a glass tube 13 including a screen 10 provided with a fluorescent surface 12 and allowing an electron beam deflected at a predetermined deflection angle (generally 45°) to proceed therethrough, an electron gun mounted in the rear portion of the glass tube 13 for scanning the electron beam, and a vertical/horizontal deflector plate 26 for deflecting the electron beam in vertical and horizontal directions.

In particular, the electron gun is comprised of a cathode 22 for receiving amplified red, green and blue signals and. emitting electrons according to the supply of negative voltage from a heater 21, a control grid (or an electron lens) 23 for modulating luminance by controlling the amount of electrons emitted from the cathode 22, a plurality of accelerating grids 24 for preventing the electrons from being diffused by the mutual repulsive force of the electrons and accelerating the electrons to reach the fluorescent surface 12, and an anode 25 for discharging high voltage when electric power is turned off by isolating the electron gun and the screen 10 from each other.

Such a cathode-ray tube scans electron beams using one or three electron guns according to image data inputted to the cathode, and the scanned electron beams allow the fluorescent surface 12 of the glass tube 13 to be luminous while colliding with the fluorescent surface 12, thereby realizing images.

However, in the conventional cathode-ray tube, the deflection angle of the deflector plate for deflecting the electron beams in horizontal and vertical directions is fixed, so it is difficult to fabricate the cathode-ray tube to allow the distance between the glass tube and the electron gun to be short. Therefore, the size of a television becomes large and causes the television to occupy a large space.

Additionally, the electron beams are deflected and scanned to form a deflection surface of the horizontal/vertical deflector plate to have a fixed curvature, so it is difficult to manufacture not only a display such as a flat television but also a large-size display.

Disclosure of the Invention

Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a display using multiple miniaturized cathode-ray scanners, in which a glass tube includes a screen provided with a fluorescent surface, the screen is divided into unit screens each having a flat plate shape and a predetermined size, each of the miniaturized cathode-ray scanners is arranged behind a corresponding unit screen and the multiple miniaturized cathode-ray scanners can implement images in response to control signals from a multi-image processing unit, so the distance between the miniaturized cathode-ray scanners and the unit screens can be minimized, thereby being capable of fabricating a thin flat display, and facilitating the fabrication of small-sized and large-sized displays by disposing the unit screens in an nxm arrangement.

Brief Description of the Drawings

Fig. 1 is a cross section showing a conventional cathode-ray tube;

Fig. 2 is an exploded perspective view showing the construction of a miniaturized cathode-ray scanner in accordance with the present invention; and Fig. 3 is an exploded perspective view showing a display in which the multiple miniaturized cathode-ray scanners of the present invention are disposed in a 2x2 arrangement.

Best Mode for Carrying Out the Invention

Hereinafter, the construction and operation of multiple miniaturized cathode-ray scanners in accordance with the present invention are described.

Fig. 2 is an exploded perspective view showing the construction of a miniaturized cathode-ray scanner in accordance with the present invention. Fig. 3 is an exploded perspective view showing a display in which the multiple miniaturized cathode-ray scanners of the present invention are disposed in a 2x2 arrangement. In the drawings, reference numerals 10 and 20 designate a screen and a miniaturized cathode-ray scanner, respectively. In the display including the screen 10 in accordance with the present invention, the screen 10 is divided into unit screens 11 each having a predetermined size, and the miniaturized cathode-ray scanner 20 is disposed behind each of the unit screens 11 to form an nxm arrangement (a lattice or

5 zigzag type arrangement).

In this case, the unit screens 11 are a portion of the display for implementing a real image, and correspond to the screen of a conventional glass tube 13. A single miniaturized cathode-ray scanner 20 for scanning an electron beam is arranged behind each of the unit screens 11 one to one and implements a

0 partial image on a corresponding unit screen 11, thereby minimizing the distance between the cathode-ray scanner and the unit screen.

In particular, the unit screens 11 are disposed in an nxm arrangement such as a lattice or zigzag type arrangement, so the display can be manufactured in various sizes (for example, a small, medium or large size) according to the size

5 of the screen of a display. The unit screens 11 are manufactured to form an n=m arrangement, so the display can be manufactured in a square form.

In a preferred embodiment of the present invention, the unit screens 11 are disposed to have a screen ratio of 4 to 3 or 16 to 9, and can be desirably selected according to a general image display or movie display.

: 0 The unit screens 11 are fabricated into a flat structure and the distance between the cathode-ray scanner 20 and the unit screen 11 can be manufactured to be short, thus allowing a flat display to be fabricated. As described above, if the nxm arrangement of the unit screens and the miniaturized cathode-ray scanner is changed, small-sized and large-sized flat displays can be fabricated.

!5 That is, the unit screen 11 and the cathode-ray scanner 20 are manufactured to be small-sized to minimize the distance between the electron beam scanning position of the cathode-ray scanner 20 and the fluorescent surface of the unit screen 11. Additionally, the curvature of the unit screen 11 can be manufactured to be maximized, so a completely flat screen 10 can be 0 manufactured. Additionally, the entire length of the cathode-ray tube can be reduced, so it is possible to allow the thickness of the display to be thin.

The cathode-ray scanner 20 is comprised of a cathode 22 (an electron emission source) for emitting electrons to a unit screen provided with a fluorescent surface according to the control- signals of a multi-image processing unit, one or more accelerating grids 27 for enabling the electrons to reach the unit screen 11; one or more focusing grids 28 for axially focusing the electrons so as to prevent the electrons from being diffused, and a deflector plate 26 for deflecting the electrons at a predetermined deflection angle. In particular, the deflector plate 26 can be fabricated in the form of a single deflector plate composed of four terminals (or more terminals) or a composite deflector plate composed of two or more deflector plate parts.

In this case, the grids are manufactured through a minute semiconductor fabricating process or a minute manufacturing process using a laser, different from a conventional CRT manufacturing process. In more detail, the grids (electron lenses) are manufactured of silicone or metal. The grids are each fabricated by using a piece of the silicone (or metal) having a size of several mmx several mm and a thickness of 1 to 2 μm and forming a minute circular hole (having a diameter of several to several hundred micrometers) at the center of the piece so as to allow electrons to pass therethrough.

The grids manufactured in the above-described manner are integrated with insulators disposed therebetween, and are used to fabricate the miniaturized cathode-ray scanner. In particular, the size and thickness of each grid are minimized to fabricate a miniaturized cathode-ray tube. In addition, the cathode-ray tube can be manufactured to be several mm to several cm in length through the above-described grid fabrication technique. Accordingly, a television can be manufactured to be several cm in its entire thickness.

In accordance with a preferred embodiment of the present invention, in the cathode-ray tube, an electron beam is scanned onto each of the unit screens 11 constituting the screen 10, so the scan area of the cathode-ray tube can be made to be hundreds of μm x hundreds of μm to several cm x several cm. Accordingly, if the size of each of the unit screens 11 is made small to increase the number of electron beams though the screen 10 has the same size, the image

5 quality of the display is improved.

Additionally, in the miniaturized cathode-ray scanner, it is desirable that the accelerating grids and focusing grids each are at least three in number and that insulators are inserted therebetween. In this case, it is desirable to manufacture the miniaturized cathode-ray scanner to be 1 to 10 cm in its entire

0 length.

Meanwhile, in order to enable the cathode-ray scanners fixedly positioned behind the unit screens 11 to implement images, the cathode-ray scanners 20 are controlled by a multi-image processing unit. The multi-image processing unit divides received video signals according to images corresponding

5 to the unit screens, and transmits the divided, scanned signals to the cathode-ray tubes, thus realizing partial images on the unit screens. This type technique can be applied to analog type displays, and can be easily implemented for digital type displays.

Industrial Applicability

: 0 As described above, in the display of the present invention, a screen is divided into unit screens and a miniaturized cathode-ray scanner is disposed behind each of the unit screens, so an entire image is implemented through a multi-image processing unit, thereby providing the following effects.

1) The miniaturized cathode-ray scanners are arranged in parallel, so a >5 thin display can be manufactured. Additionally, the cathode-ray tube is miniaturized, so it can be operated with low voltage in comparison with a conventional large-sized cathode-ray tube.

2) A large number of electron beams are emitted through a plurality of cathode-ray scanners arranged in parallel, so the luminance and scanning speed of a display can be improved, thereby improving not only the brightness of the screen but also image quality.

3) A display can be manufactured to have a varied arrangement (an nxm arrangement) of miniaturized cathode-ray scanners according to the screen size of a display, so displays having various screen sizes and shapes including small- sized and large-sized flat displays.

The display of the present invention can be preferably applied to the field of a flat television. A large-sized flat television can be manufactured using the display. Additionally, it can be used for all the fields employing cathode-ray tubes including a computer monitor, a large-sized electronic bulletin board, etc.

Claims

1. A miniaturized cathode-ray scanner, comprising an electron emission source for emitting electrons to a unit screen provided with a fluorescent surface according to the control signals of a multi-image processing unit, one or more

5 accelerating grids for enabling the electrons to reach the unit screen, one or more focusing grids for axially focusing the electron beams so as to prevent the electron beams from being diffused, and a deflector plate for deflecting the electron beams at a predetermined deflection angle; wherein the accelerating grids and the focusing grids are each

0 constructed in the form of a membrane of 1 to 2 μm in thickness and provided with a minute circular hole.

2. The miniaturized cathode-ray scanner according to claim 1, wherein at least three accelerating grids and at least three focusing grids are respectively stacked one on top of another, insulators are inserted therebetween, and the

.5 accelerating grids, the focusing grids and the insulators are integrated into a single body.

3. A display using multiple miniaturized cathode-ray scanners, wherein a glass tube includes a screen provided with a fluorescent surface, the screen is divided into unit screens each having a flat plate shape and a predetermined size,

! 0 a miniaturized cathode-ray scanner is arranged behind each of the unit screens, and the miniaturized cathode-ray scanner can implement an image in response to control signals from a multi-image processing unit.

4. The display according to claim 3, wherein said miniaturized cathode- ray scanner comprises an electron emission source for emitting electrons

.5 according to the control signals of a multi-image processing unit, one or more accelerating grids for enabling the electrons to reach the unit screen, one or more focusing grids for axially focusing the electron beams so as to prevent the electron beams from being diffused, and a deflector plate for deflecting the electron beams at a predetermined deflection angle.

5. The display according to claim 3, wherein said unit screens and miniaturized cathode-ray tubes are arranged to allow a screen ratio to be 4 : 3 or

16 : 9.

6. The display according to claim 4, wherein said miniaturized cathode- ray scanner is constructed in such a way that at least three accelerating grids and at least three focusing grids are respectively stacked one on top of another and insulators are inserted therebetween, and has an entire length of 1 to 10 cm.

7. A flat television including a miniaturized cathode-ray tube according to claim 1 or 2 or display according to claim 3 or 4.