JPH04315762A - Light-emitting element - Google Patents

Abstract

PURPOSE:To prevent electrical trouble resulting from getter films formed within a vacuum envelope. CONSTITUTION:A base 20 on which to place each electrode group is provided in such a way as floating above the back panel 3 of a vacuum envelope 1, and a metallic container 21 is provided on the back side of the base 20 and getter 13 is disposed in the metallic container 21 whereby scattering of a getter film 14 over each electrode group is restrained. Sufficient burning of the getter is thus made possible and the degree of vacuum within the vacuum envelope is sufficiently enhanced by the getter.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting element constituting a pixel of a large screen color display device.

0002

2. Description of the Related Art FIG. 2 shows the basic structure of a conventional light emitting device of this type, such as a display tube for a light source.
is a plan view, FIG. 3(b) is a cross-sectional view taken along line A-A', and
is an exploded perspective view of the multi-cell, which is arranged in a 3 x 3 pixel matrix, with a phosphor screen having one pixel for each of R (red), G (green) and B (blue) phosphors. This type of light source display tube will be explained. In the figure, 1 is a vacuum envelope as a glass tube hermetically sealed by a front panel 2, a back panel 3, and a cylindrical side plate 4.
. Here, fluorescent screen 5R, 5
The subscripts of G and 5B are red (R), green (G), and blue (B).
correspond to each. 6 is each fluorescent screen 5R of the fluorescent display section 5
, 5G, 5B, which are arranged in correspondence to the peripheries of the electrodes 61, 62, etc., and external terminals 16 are connected to these acceleration anodes 61, 62,... A high voltage is applied through the terminal. Reference numeral 7 denotes a cathode electrode group in which cathodes 711 to 733 (not shown) for emitting electrons are arranged independently corresponding to each of the fluorescent screens 5R, 5G, and 5B of the fluorescent display section 5, and these cathodes 711 733 are each supported between a pair of supports fixed on the back panel 3 at both ends. Here, the first and second subscripts of the cathodes 711 to 733 correspond to the first to third rows and the first to third columns, respectively. Note that each cathode 711 to 733 has, for example, N
An indirectly heated type in which the i-sleeve is coated with oxide or a direct heated type in which tungsten is coated with oxide can be used. Further, 8 is a grid electrode group consisting of control grids 81 to 83 for row selection arranged between the cathode electrode group 7 and the fluorescent display section 5, and these control grids 8
1 to 83, each fluorescent screen 5R, 5G of the fluorescent display section 5
, 5B in the row direction, respectively.
Electron passing holes 91 to 93 are provided to allow the electron beams 11 from 733 to pass through as unfocused beams. Numerals 10 are arranged on the back side of the cathode electrode group 7, that is, on the back panel 3 forming a part of the vacuum envelope 1, and facing in the row direction corresponding to each of the fluorescent screens 5R, 5G, and 5B of the fluorescent display section 5. Back electrode 1 for selecting striped columns arranged
01 to 103, and these back electrodes 101 to 103 are formed from a conductor layer such as Ag. And each of the aforementioned back electrodes 101 to 1
03 controls the electron beam 11 emitted from the cathodes 711-733 by applying a negative potential and a positive potential of 0 V or several V to the potential of each cathode 711-733. The reference numeral 12 designates a lead pin as an external terminal for pulling out each electrode such as the cathode electrode group 7, the grid electrode group 8, and the back electrode group 10 from the back panel 3, and this lead pin 12 is embedded in the back panel 3. It penetrates and is pulled out to the outside. Further, as shown in FIG. 4, a getter 13 is attached to the accelerating anode facing the cylindrical side plate 4 in the vacuum envelope 1, and the scattering of the getter 13 forms a getter film on the inner surface of the cylindrical side plate 4. 14 is formed. In addition, 15 is a frit glass which joins the cylindrical side plate 4, the front panel 2, and the back panel 3.

0003

[Problems to be Solved by the Invention] However, in the conventional light source display tube, when the getter 13 attached to the anode electrode group 6 facing the cylindrical side plate 4 of the vacuum envelope 1 is scattered, the cylindrical A getter film 14 is formed over a wide area on the inner surface of the shaped side plate 4, and the distance between the getter film 14 and the grid electrode group 8 formed on the back panel 3 is close, so that short circuits or discharges may occur between the two. There was a problem with electrical problems.

Therefore, an object of the present invention is to provide a light emitting element that does not have the electrical troubles caused by the getter film mentioned above.

[0005]

[Means for Solving the Problems] In order to achieve the above object, a light emitting device according to the present invention is provided with a substrate on which a cathode electrode group, a grid electrode group and a back electrode group are mounted, and this substrate is enclosed in a vacuum envelope. A metal container is provided on the back side of the substrate, and a getter is placed inside the metal container.

[0006]

[Function] In the light emitting device according to the present invention, the getter is housed in a metal container and placed on the back side of the substrate which is provided floating above the back panel of the vacuum envelope, so that unnecessary parts are removed due to scattering of the getter. The getter film is not scattered, and a getter film is formed over a wide area on the back panel.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a main part showing the structure of an embodiment of a light emitting element according to the present invention, and the same parts as in the previous drawings are given the same reference numerals, and the explanation thereof will be omitted. In the same figure,
20 is a ceramic substrate, for example, which is provided floating above the back panel 3 constituting the vacuum envelope 1, and a cathode electrode group 7, a grid electrode group 8, and a back electrode group 10 are attached to the surface of this ceramic substrate 20. ing. The lead pins 12 of each electrode group pass through the ceramic substrate 20 or are guided to the back side of the ceramic substrate 20 through a notch on the circumference thereof, and the back panel 3 and the cylindrical side plate 4, which are joined with the frit glass 15, are connected to each other. It is led out to the outside through the section. Therefore, the ceramic substrate 20
can be attached to lead pin 1 without using any special mounting parts.
2, it is floatingly supported on the back panel 3. 21
is a metal container attached to the back panel 3 on the back side of the ceramic substrate 20, and the getter 13 is accommodated and arranged within this metal container 21.

According to such a configuration, when the getter 13 is scattered, the getter film 14 is formed on the back panel 3, but the distance from each electrode group arranged on the surface of the ceramic substrate 20 becomes long. , electrical troubles will no longer occur. Furthermore, since the getter 13 is provided within the metal container 21, the spread of the getter film 14 can be suppressed, and therefore electrical troubles caused by the getter film 14 can be more reliably prevented.

[0009]

[Effects of the Invention] As explained above, according to the present invention,
A substrate is provided floating above the back panel of the vacuum envelope, a cathode electrode group, a grid electrode group, and a back electrode group are attached to the surface of this substrate, a metal container is provided on the back side of this substrate, and the inside of this metal container is Since the getter is disposed in the rear panel, a getter film due to scattering of the getter is formed on the surface of the rear panel, and electrical troubles caused by this getter film can be reliably prevented. Therefore, the getter can be sufficiently burned, the degree of vacuum in the vacuum envelope can be sufficiently increased by the getter, and a light emitting device with high quality and reliability can be obtained, which is an extremely excellent effect.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing the structure of an embodiment of a light emitting element according to the present invention.

FIG. 2(a) is a plan view showing the basic configuration of a conventional display tube for a light source, and FIG. 2(b) is a sectional view taken along line A-A'.

FIG. 3 is an exploded perspective view of a portion of FIG. 2;

FIG. 4 is an explanatory enlarged cross-sectional view of essential parts showing the arrangement structure of a getter in a conventional display tube for a light source.

[Explanation of symbols]

1 Vacuum envelope 2 Front panel ３　　　　Back panel 4 Cylindrical side plate 5 Fluorescent display section 6 Anode electrode group 61 Acceleration electrode 62 Acceleration electrode 63 Acceleration electrode 7 Cathode electrode group 8 Grid electrode group 10 Back electrode group 11 Electron beam 12 Lead pin 13 Getta 14 Getter film 15 Fritted glass 16 External terminal 20 Ceramic substrate 21 Metal container

Claims (1)

[Claims] 1. A vacuum envelope in which a front panel is hermetically sealed to the front side of a cylindrical side plate, and a back panel is hermetically sealed to the back side thereof, and a fluorescent display section is formed by arranging fluorescent screens in a matrix on the inner surface of the front panel. an anode electrode group consisting of a plurality of accelerating anodes arranged around the phosphor screen; a cathode electrode group including electron emission cathodes arranged independently corresponding to the phosphor screen; and the cathode electrode group. A plurality of electron passing holes are arranged between the group and the fluorescent display section in the row or column direction corresponding to each fluorescent screen of the fluorescent display section and allow electrons from each of the cathodes to pass through as a non-focused beam. a grid electrode group consisting of a control grid; and a back electrode group consisting of a plurality of back electrodes arranged on the back side of the cathode electrode group in a column or row direction corresponding to each fluorescent screen of the fluorescent display section. In the light emitting element, each control grid of the grid electrode group and each back electrode of the back electrode group constitute a matrix, in which the cathode electrode group, the grid electrode group, and the back electrode group are mounted so as to float above the back panel. 1. A light emitting device comprising: a substrate, a metal container placed on the back side of the substrate, and a getter housed in the metal container.