JPH02123649A - Graphic fluorescent character display tube - Google Patents

Abstract

PURPOSE:To prevent a short-circuit accident with an anode and obtain a sharp luminous characteristics by forming a conductive material on an insulation layer provided between phosphor layers for the contact extension of a wire grid. CONSTITUTION:An Al or ITO film is patterned on a glass substrate 1 for leading an anode wire 2 and a grid wire 5 for external connection. An insulation layer 4 adjacent to a luminous element is formed in a direction orthogonal with the wire 2. A conductive material 5 is formed on the layer 4 and the ends thereof are lowered for being baked and connected to the grid wire 9. A phosphor luminous element formed on the substrate 1 in a dotted shape forms the layer of a phosphor 6 via electrodeposition. A wire grid 5 comprising the etched 426 alloy sheet is aligned with the conductor of the upper layer of an insulator 4 in the sealing process of a filament cathode and cover glass, and kept in close contact with the conductor. Then, the wire grid 5 is sealed and fastened. After exhausting the fluorescent character display tube, a portion of the unnecessary wire grid 5 is cut off from a half-etching part 11 and scrapped.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to graphic fluorescent display tubes, and more particularly to grids.

[Prior Art] Conventionally, this glazed graphic fluorescent display tube is shown in Fig. 3 (a).
), as shown in FIG. 3(b), a linear filament cand (not shown) and a PIIJ electrode wiring 2 in which phosphor 6 is coated on a glass substrate 1 in the form of dots or parallel lines. A wire grid 5 stretched at right angles above the phosphor 6 controlled the electron beam to emit the necessary light.

At ζζ, the wire grid 5 is connected to the grid fixed glass 7
The grid fixing glass 7 and the wire grid 5. The grid fixing glass 7 and the glass substrate 1 are each fixed.

[Invention tries to solve it! l! Title]

The conventional graphic fluorescent display tube mentioned above has a one-wire grid 5 as shown in Fig. 4, so from the mounting surface there are hundreds of side glasses with a grid pitch of about 0.4 to 0.8 fins. However, it was necessary to solder the grid wire coming out of the vacuum envelope made of the cover glass 12 to the printed circuit board, which required extremely sophisticated connection technology. Furthermore, as shown in Fig. 4, since the wire grid 5 is held stretched in a vacuum space, heat conduction is poor, and deformation due to heating by the electron beam may cause a short circuit with the anode. There were many.

On the other hand, there is also a structure in which a conductive material is coated on the top surface of the insulating layer formed around the phosphor to form a grid, but with this structure, the height must be at least 8 times the thickness of the phosphor layer to prevent addressing. This tends to cause a problem due to the so-called cut-off characteristic, where the phosphor screen between the grids that are not connected shines a little. However, for example, forming an insulating layer with a width of 0.2131 mm or less and a thickness of 9.2111 mm or more is based on the flow characteristics of glass during firing.

There were disadvantages in that it was impossible to form a force, a hole, or a height, and that it was difficult to put it into practical use.

SUMMARY OF THE INVENTION An object of the present invention is to provide a graphic fluorescent display tube which solves the above-mentioned drawbacks, prevents short-circuiting with the anode, and provides sharp light emission characteristics.

Means for Solving ca@] The configuration of the present invention includes, in a vacuum envelope, a cathode that emits electrons, a wire grid that controls the electrons, and a dot-shaped phosphor layer that emits light by collision of the electrons. In the graphic fluorescent display tube, an insulating layer is formed between the phosphor layers, a conductive material is formed on an upper surface of the insulating layer, and the wire grid is stretched in contact with the conductive material. shall be.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1<a) is a plan view of the substrate portion of a graphic fluorescent display tube according to the first embodiment of the present invention. FIG.
It is a perspective view of the board|substrate before stretching the wire grid of a). In these figures, the graphic fluorescent display tube of this embodiment has a cathode that emits an electron beam into a vacuum envelope, and a wire grid 5 that accelerates and controls the electron beam, and emits light by collision of the electron beam. The light-emitting elements of the dot-shaped phosphor 6 are connected to each other in a certain direction by thin film wiring, and an insulating layer 4 is formed adjacent to the light-emitting element. A conductive material is placed on the upper surface of the layer 4, and a wire grid 5 is tightly stretched over it.

Here, the main surface of the glass substrate 1 is coated with aluminum (AAi).
) or ITO film is patterned to provide anode wiring 2 and grid wiring 9 for connection to the outside. An insulating layer 4 is formed adjacent to the light emitting element in a direction perpendicular to the anode wiring 2 . This insulating layer 4 is formed by a printing method or a photolithography method, and is formed to a height of 0.2111 after firing, and a conductive material 3 is formed on the upper part of the insulating layer 4 by a photoresist method. descends and is fired and connected to the grid wiring 9. A layer of phosphor 6 is formed on the dot-shaped phosphor light-emitting element on the substrate 1 by electrodeposition. In the step of sealing the filament cathode and the cover glass to the substrate, the wire grid 5 etched from 426 alloy with a thickness of 0.2111 is attached to the insulator 6 using a jig.
After aligning with the conductor on top of the layer and bringing them into close contact, seal and fix.

After the sealed graphic fluorescent display tube is evacuated,
A part of the wire grid 5 that is no longer needed is cut and discarded from a half-etched part 11 provided in the vicinity of the cover glass sealing part to complete the process.

FIG. 2 is a sectional view of a substrate portion of a graphic fluorescent display tube according to a second embodiment of the present invention. In FIG. 2, the fluorescent display tube of this embodiment has ITOIIA on the main surface of the glass substrate 1.
An insulating layer 4 is formed around the patterned Al 114 and the phosphor 6, and a conductive material 3 is formed on the upper surface of the insulating layer 4. A wire grid 5 is stretched in close contact with the conductive material 3, and further wire grids 5 are stretched over the conductive material 3 at the same pitch.

In this practical example, since the grid surface can be formed at a height 15 times or more higher than the plane of the phosphor 6, there is an advantage that it can be applied even to large light emitting elements.

〔Effect of the invention〕

As explained above, the present invention utilizes the advantage of the wire grid being stretched sufficiently higher than the surface of the phosphor, and the upper part of the insulating layer, which has the advantage of being easily formed around the phosphor. As a result, the present invention makes it possible to use FPC, etc. to connect the grid wires to the printed board for mounting purposes, and also allows charging of the insulating layer by forming a metal with sufficient width and height on the top of the insulating layer. This eliminates the close-up phenomenon, makes it easier for the electron beam to collide with the phosphor, and improves the sharpness of the edges of the light-emitting part, which improves the display quality.Furthermore, the heat generated by the grid wire is dissipated through the insulating layer, so the heat is reduced. This has the effect of eliminating problems such as short circuits due to swelling and improving reliability.

[Brief explanation of drawings]

FIG. 1(a) is a plan view of the substrate portion of a graphic fluorescent display tube according to the first embodiment of the present invention, and FIG.
), FIG. 2 is a sectional view of the substrate portion of the second embodiment of the present invention, and FIG. 3(a) is a plan view of the substrate portion of a conventional graphic fluorescent display tube. (b) is shown in Figure 3 (a)
) is a sectional view taken along line AA' of FIG. 4, and FIG. 4 is a perspective view of a conventional graphic fluorescent display tube. DESCRIPTION OF SYMBOLS 1... Glass substrate, 2... Anode wiring, 3... Conductor material, 4... Insulating layer, 5... Wire grid,
6... Phosphor % 7... Grid fixed glass, 8...
... Frit, 9... Grid, wire, 11... Half etching, 12... Cover glass, 13... Filament. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] In a graphic fluorescent display tube including a cathode that emits electrons, a wire grid that controls the electrons, and a dot-shaped phosphor layer that emits light by collision with the electrons in a vacuum envelope, there is a space between the phosphor layers. 1. A graphic fluorescent display tube comprising: an insulating layer; a conductive material formed on the upper principal surface of the insulating layer; and the wire grid being stretched in contact with the conductive material.