JPS6093742A - Display device - Google Patents

Abstract

PURPOSE:To obtain a display device with the good focusing properties by constituting at least one electrode of the electron beam control electrodes performing focusing, deflection and modulation of a conductive magnet body having a thickness of 0.01mum-2mm. and the vertical magnetization on its surface. CONSTITUTION:In a display device, in which an electron beam is taken out of an electron source for being focused, deflected and modulated while being made to collide with a phosphor, the electrode part for taking out an electron beam is formed of a conductive substrate 15, a conductive magnet body 16, in which a Co-Cn vertical magnetic film of hexagonal system is formed on its surface by a sputtering method up to a thickness of 0.01mum-2mm. so that its magetization direction 16a may be all alike vertical to the surface of the substrate, as well through holes 15a. In this way, the electron beam 18 having low electron speed fetched from the cathode by a focusing mgnetic field 17, which is made by the electron beam fetch electrode, is focused in a fully spiral shape so as to make a display device with the good focusing properties having an well-regulated orbit.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a display device for displaying an image of a character by extracting and controlling an electron beam from an electron source and colliding it with a phosphor.

Configuration of Conventional Example and its Problems The present inventors previously proposed a display device having the structure shown in Fig. f-1-21. This display device includes a linear hot cathode 1 which is coated with a thermionic emission property on a metal wire 1, for example, a tungsten wire, and is stretched at regular intervals, and a thermionic emission property from the cathode is controlled on the back side of the linear hot cathode. Back electrode 2. A plurality of through holes 31L, 4 are arranged parallel to the linear hot cathode at equal intervals.
Electron beam extraction electrode with a 3.4. Vertical deflection electrodes 5 arranged at equal intervals parallel to the linear hot cathode
, 6a at the same position as the j'■ through holes 3a and 4a
An electrode 7 having a slit 7a at the same position as the electron beam modulation electrode 6, said sleeve 6a, and the electrode of each slit has a thickness that can be changed independently. A horizontal deflection electrode 8 forming a slit 8a by two parallel flat plates in the same position as the slit 7a, and an electrode 9 for assisting vertical deflection in the same position as the vertical deflection electrode, having a phosphor and a metal back layer on the inner surface. It consists of an anode made of a glass container on the display surface and a container on the back surface (not shown).

These electrode groups are kept insulated using insulating partition plates at intervals suitable for each purpose, fixed with frit glass, etc., and then bonded with the display glass container and back container, and then evacuated. .

The display device obtained in this way has a display surface of, for example, 30 mm.
In the case of 16 linear hot cathodes 1, an electron beam whose trajectory is adjusted to some extent is taken out by the back electrode 2 and the electron beam extraction electrodes 3 and 4, and is deflected and focused in the vertical direction by the vertical deflection electrode 5. The pulse width is modulated by the modulation electrode 6, the horizontal focus is adjusted by the electrode 7, and the horizontal deflection electrode 8 causes the light to collide with the phosphor of the anode 10 in a horizontal direction, thereby displaying an image with uniform brightness on the entire display surface. It is an attempt to do so.

FIG. 2 is a detailed view of the vicinity of the electron beam extraction electrode in FIG. 1. The back electrode 10 is composed of an insulating substrate 11 and a conductive material 12 thereon. At this time, a voltage of approximately 3Qv is applied to the electron beam extraction electrode 3 and a voltage of Ov is applied to the electrode 4 to extract the electron beam from the cathode.The electron beam with a well-aligned trajectory and good focusing characteristics is produced by the electron lens effect of the electrodes 3 and 4.5. can get.

However, the energy of the electron beam from the cathode is several tens of θ.
Since the electron beam 13 is extracted at a high speed of about V and passes close to the aperture of the electrode, the trajectory of the electron beam is disturbed, aberrations increase, and focus characteristics deteriorate. Further, the potential distribution 14 created by the electron beam extraction electrode and the back electrode is designed to make the extraction and focusing of the electron beam the same. Therefore, control of the electron beam emission 111 from the cathode and its focusing cannot be independently adjusted. Therefore, the optimum conditions for focusing the electron beam and the adjustment of the electron beam emission times are not in harmony, and when trying to obtain a certain amount of electron beam emission I11, the electron beam that has passed through the electron beam extraction electrode 1ji4 is not focused well, so There is a problem with poor focus characteristics.

OBJECTS OF THE INVENTION The present invention eliminates the drawbacks of the above-mentioned devices, and uses conductive magnetic electrodes whose magnetization directions are perpendicular to their surfaces to extract well-focused electron beams with well-aligned trajectories from an electron source. This provides a display device with good focus characteristics.

Structure of the Invention The present invention provides a display device having an electron source, in which an electrode made of a conductive magnetic material with magnetization perpendicular to the surface is provided in order to control and focus the electron beam emitted from the electron source. This improves the focusing characteristics of the electron beam.

DESCRIPTION OF THE EMBODIMENTS The difference between the embodiment of the present invention and the conventional example is that the electron beam extraction electrode section is structured as shown in FIG. Its structure consists of a conductive substrate 16 (for example, aluminum alloy) and a hexagonal Go-Or perpendicularly magnetized film formed by sputtering on the surface of the conductive substrate 16 to a thickness of several μm so that the magnetization direction 15 is aligned and perpendicular to the substrate surface. It is formed of a conductive magnetic material 16 with a thickness of several tens of μm and a through hole 152L. The magnetization of the magnetic material was sufficient to focus the electron beam. The electron beam extraction electrode having the structure shown in FIG. 3 was used in place of the electron beam extraction electrodes 3 and 4 of the conventional display device shown in FIG.

The powder hot cathode used was a tungsten wire with a diameter of 2Q μm coated with an oxide cathode material. 12o~- on the back electrode
A voltage of 6OV was applied to the cathode, a voltage of -10 to -50V was applied to the beam extraction electrode, and a voltage of 10kV was applied to the anode. The distance between the back electrode and the cathode is 2 mm.

The distance between the cathode and the beam extraction electrode is 1 to 2 mm, +
The A through hole 16a was set to 0.3~0.s mm. In this way, a low-speed electron beam is extracted from the cathode by the electron beam extraction electrode, and since the electron velocity is slow due to the focusing magnetic field 17 created by the electron beam extraction electrode, the electron beam 18 is sufficiently focused in a spiral shape even with a weak magnetic field. A display device with well-organized focus characteristics is great! I was beaten.

Similarly, replacing the electrodes 6, 7, and 8 with magnetic electrodes having the desired magnetization on their surfaces would also be effective since the electron beam C would be focused. Furthermore, this magnetic electrode 4 can also be used as a mask between the anode 10 and the electrode 9. At this time, if the magnetic electrode is made of a conductive perpendicularly magnetized film, a potential is applied and the electric electron lens formed between it and the box electrode can be adjusted, and this combines with the focusing action of the magnetic electron lens to improve focusing. A shadow mask with uniform magnetization characteristics and thickness can be easily manufactured by vapor deposition or sputtering.

Further, the magnetic electrode is formed on an insulating substrate (for example, sapphire).
Similar effects were obtained by forming a hexagonal Go-Or film thereon by sputtering. Furthermore, this insulating substrate has the feature of serving as an insulator or a spacer between electrodes.

Furthermore, by forming the magnetic electrode with a hexagonal magnetic material, the direction of magnetization becomes perpendicular to the electrode surface and is stable, resulting in very good electron beam focusing characteristics and easy fabrication.・Effects of the Invention The present invention uses a conductive magnetic material whose magnetization direction is perpendicular to the electrode surface, and uses its magnetic field to focus an electron beam to improve focus characteristics, and also to apply an electric potential to the electron beam to adjust the electron lens system. The amount of electron beam emitted from the cathode can be adjusted optimally, resulting in a display device with good focusing characteristics.Because it uses a conductive magnetic material, there is no charge caused by bumps on the electron beam electrode, making it easier to use than other focusing electrodes or other focusing electrodes. It can also be used as a nyadou mask. Further, although a metal film is formed on the surface of the ferrite magnet, it is the same as the present invention even if it is used for the insulating partition plate of the present invention. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional display device; FIG. 2 is a sectional view of the electron beam taken out in FIG. FIG. 3 is a sectional view of the vicinity of the extraction electrode. 1... Linear hot cathode, 2... Back electrode, 3.4
...Electron beam extraction electrode, 5...Vertical deflection electrode, 6...Modulation electrode, 8...Horizontal (Ji:
i-plane electrode, 10... anode, 16... conductive magnetic material, 16a... IIH conversion, 17... magnetic field, 1
8...Electron beam orbit.

Claims (3)

[Claims] (1) an electron source, and four stages of electron beam control for extracting, focusing, deflecting, and modulating the electron beam from the electron source;
A display device comprising: a light emitting means that emits light upon collision of the electron beam, wherein at least one of the electron beam control electrodes has a thickness of 0.01 μm and has magnetization perpendicular to the surface.
A display device comprising a conductive magnetic material with a diameter of 1 to 2 mm. (2) The display device according to claim 1, wherein the control electrode is a perpendicularly magnetized film formed on the second side of a conductive or insulating substrate. (3) The display device according to claim 1 or 2, wherein the crystal structure of the magnetic material is hexagonal.