JPH04359850A - Light emitting element - Google Patents

Abstract

PURPOSE:To suppress initiation of cracks at the root of each lead pin, which is protruding outside from the back panel, and prevent generation of vacuum leakage by adhering a low melting point glass to the lead pin root part at the back panel. CONSTITUTION:A cathode electrode group 4, grid electrode group 8, and back- plate electrode group 10 are encapsulated in a vacuum envelope 1, and lead pins 12 whose one-side ends are connected with electrodes of these groups 10 and other ends penetrate the back panel 3 are drawn out. A low melting point glass 15 is applied to the root of each lead pin 12 at the back panel 3, and adhesion takes place with sintering followed by consolidation. Thereby cracks are not likely initiated even though an external force is applied to the pin 12 because its root is enclosed with the glass 15.

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 display device.

0002

2. Description of the Related Art FIG. 5 shows the structure of a conventional light source display tube of this type, in which (a) is a plan view and (b) is a cross-sectional view taken along the line A-A'. , R (red), G (green)
A multi-cell type light source display tube in which a phosphor screen having one pixel of each of the B (blue) phosphors and B (blue) phosphors is arranged in a 3×3 pixel matrix will be described. In the figure, reference numeral 1 denotes a vacuum envelope as a glass tube hermetically sealed by a front panel 2, a rear panel 3, and a cylindrical side plate 4. Each of G and B is used as a unit pixel and is applied and arranged in a matrix to form a fluorescent display section 5 consisting of 3×3 pixel fluorescent screens 5R, 5G, and 5B. Here, fluorescent screen 5R
, 5G, and 5B are red (R), green (G), and blue (
B) respectively. Reference numeral 6 denotes an anode electrode group consisting of a plurality of accelerating anodes 61, 62, etc. disposed corresponding to the periphery of each of the fluorescent screens 5R, 5G, 5B of the fluorescent display section 5, and these accelerating anodes 61 , 62 . . . are applied with a high voltage via the external terminal 13. 7 is each fluorescent screen 5R, 5G, 5B of the fluorescent display section 5
This is a cathode electrode group in which cathodes 711 to 733 (not shown) for emitting electrons are arranged independently corresponding to each other, and each of these cathodes 711 to 733 is a pair of cathodes with both ends fixed on the back panel 3. is supported between. 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. For each of the cathodes 711 to 733, for example, an indirectly heated type cathode formed by coating an oxide on a Ni sleeve or a directly heated type cathode formed by coating tungsten with an 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. In addition, 12 is a lead pin as an external terminal that pulls out each electrode of the cathode electrode group 7, grid electrode group 8, and back electrode group 10 from the back panel 3, and 14 is the cylindrical side plate 4 and the front panel 2.
, is a frit seal that joins the back panel 3.

0003

[Problems to be Solved by the Invention] However, in the conventional light source display tube, the lead pin 1 that passes through the rear panel 3 is
When an external force is applied to the back panel 3, cracks occur at the bases of the lead pins 12 of the back panel 3, which is highly likely to develop into a vacuum leak.

0004

[Means for Solving the Problems] In order to solve the above problems, the present invention is to adhere and arrange low-melting glass at the bases of the lead pins of the rear panel.

[0005]

[Operation] In the present invention, by adhering and arranging the low melting point glass, the base portion is covered with the low melting point glass, making it difficult for cracks to occur and suppressing the progress of cracks.

[0006]

Embodiments Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings. FIG. 1 is a sectional view showing the structure of an embodiment of a light emitting element according to the present invention, and the same parts as those in the previous figures are given the same reference numerals, and the explanation thereof will be omitted. In the figure, one end is connected to each electrode of a cathode electrode group 7, a grid electrode group 8, and a back electrode group 10 enclosed in a vacuum envelope 1, and the other end is connected to the outside through a back panel 3. A low melting point glass 15 is applied to the base portion of each of the pulled out lead pins 12 and the outer surface of the back panel 3, and is bonded and solidified by sintering. When the low melting point glass 15 is bonded to the base of the back panel 3 of the lead pin 12, as shown in the enlarged cross-sectional view of the main part in FIG. By inserting the cylindrical frit tablet 16 at a temperature of about 500°C and heating it at a temperature of about 500°C, the frit tablet 16 melts, and as shown in FIG. It flows out along the outer surface, is applied to the root portion of the lead pin 12 and the outer surface of the back panel 3, and is bonded and solidified as the low melting point glass 15 by slow cooling.

According to such a configuration, the lead pin 12
A low melting point glass 1 is placed at the base of the rear panel 3 of the
By adhering and solidifying the lead pin 12, the base portion is covered with the low melting point glass 15, so even if an external force is applied to the lead pin 12, cracks are less likely to occur, and even if there are minute cracks, Since its progress can be reliably prevented, a predetermined degree of vacuum can be maintained.

FIG. 3 is an enlarged sectional view of main parts showing the structure of another embodiment of the light emitting device according to the present invention, and the same parts as those in the previous figures are given the same reference numerals. In the figure, a recess 17 having a concave cross section is integrally formed around the surface (outer surface) of the rear panel 3 where the lead pin 12 penetrates and protrudes, and a low melting point glass 15 is coated in the recess 17. and is bonded and solidified by sintering.

Even in such a configuration, the lead pin 1
The root portion of the back panel 2 of the second embodiment with the outer surface thereof is covered with the low melting point glass 15, and the same effect as described above can be obtained.

FIG. 4 is an enlarged cross-sectional view of a main part showing the configuration of still another embodiment of the light emitting device according to the present invention, and the same parts as in the previous figures are given the same reference numerals. In the figure, a ring-shaped convex portion 18 is located around the outer surface of the back panel 3 where the lead pin 12 penetrates and protrudes.
are integrally formed to form a concave portion 19 having a concave cross section, and a low melting point glass 15 is coated within this concave portion 19 and bonded and solidified by sintering.

Even in such a configuration, the lead pin 1
The root portion of the back panel 2 of the second embodiment with the outer surface thereof is covered with the low melting point glass 15, and the same effect as described above can be obtained.

[0012] In the above-mentioned embodiment, a case was explained in which the low melting point glass was adhesively arranged on the outer surface of the rear panel, but the present invention is not limited to this, and the low melting point glass was adhesively arranged on the inner surface of the rear panel. It goes without saying that the same effect as described above can be obtained even if the arrangement is made.

[0013]

[Effects of the Invention] As explained above, according to the present invention,
Low-melting glass is bonded to the base of the back panel of the lead pins that protrude from the back panel, and this base is covered, making it difficult for cracks to occur even when external force is applied to the lead pins. Even if cracks occur, their progress can be suppressed, so vacuum leaks caused by cracks can be prevented, and a light-emitting element with high quality and reliability can be obtained, which is an extremely excellent effect.

[Brief explanation of drawings]

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

FIGS. 2(a) and 2(b) are cross-sectional views of essential parts of a process for explaining a method for adhering and arranging low-melting glass to a back panel portion of a light emitting element according to the present invention.

FIG. 3 is a cross-sectional view of a main part of a rear panel section showing a structure according to another embodiment of a light emitting device according to the present invention.

FIG. 4 is a cross-sectional view of a main part of a rear panel section showing a structure according to still another embodiment of a light emitting device according to the present invention.

5(a) is a plan view showing the configuration of a conventional display tube for a light source, and FIG. 5(b) is a sectional view taken along line AA' in FIG. 5(a).

[Explanation of symbols]

1 Vacuum envelope 2 Front panel ３　　　　Back panel 4 Cylindrical side plate 5 Fluorescent display section 6 Anode electrode group 7 Cathode electrode group 8 Grid electrode group 10 Back electrode group 11 Electron beam 12 Lead pin 13 External terminal 14 Frit seal 15 Low melting point glass 16 Fritto tablet 17 Recessed part 18 Convex part 19 Recessed part

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; and a fluorescent display section 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 each of the phosphor screens, a cathode electrode group including electron emission cathodes arranged independently for each of the phosphor screens, and the cathode electrode a plurality of control electrode groups that control thermoelectrons emitted from the group and guide them to the phosphor screen;
In a light emitting element comprising lead pins having one end connected to each of the electrode groups and the other end penetrating the back panel and drawn out to the outside, low melting point glass is bonded to the base of the lead pin with the back panel. A light-emitting element characterized by: