JPS6188432A - Dot-matrix fluorescent character display tube - Google Patents

Abstract

PURPOSE:To achieve great capacity and high resolution of a dot-matrix fluorescent display tube by using separate dot blocks each having several dot anodes, installing a drain electrode surrounding each dot block and installing a filament facing each dot block. CONSTITUTION:Anodes 2 coated with a phosphor 1 are separately formed on each of several dot blocks 6. A drain electrode 7 is installed around each dot block 6 through an insulator 8, and a filament 4 is installed facing each dot block 6. A dot-matrix fluorescent character display tube is assembled by placing the above parts in a vacuum case. Emission is controlled by turning on and off dot voltage for each anode 2 while the filaments 4 are constantly maintained in a thermion-emitting state. Because of the above structure, it is possible to control displaying of several dots by one filament. Consequently, great capacity and high resolution of the display tube can be achieved by reducing the size of the dots.

Description

[Detailed Description of the Invention] [Description of the Field to Which the Invention Pertains] This invention relates to the dot matrix fire source deficiency/t! This relates to the one-part structure of the filament and anode.

"Description of the Prior Art" An example of the structure of a dot matrix fluorescent display tube according to the prior art is shown in FIG. An upper plate 5 having a hollow filament 4 is assembled so that the anode 2 and the filament 4 face each other, and a vacuum vessel is opened.

Anode 2 is made of 1μ aluminum! After vapor deposition to a thickness of about n, the phosphor 1 is formed into stripes by photolithography, and the phosphor 1 is formed by screen printing.

Filament 4 has 777742778 layers of tongue
It has a vague shape and is arranged hollow, and is manufactured by a process in which a temporary underlayer is formed on the upper plate 5 of the glass substrate, a filament thin film layer is formed, and then the temporary underlayer is removed by etching. do.

The operation is performed by dynamic driving by constantly applying positive pressure to the anode 2 and directly turning the filament 4 on and off.

This method has the disadvantage that the number of filaments 4 required is equal to the number of anode dots, resulting in a complicated circuit.

Further, since the size of one dot is also limited by the size of the filament, it is difficult to achieve a size of one dot of 0.5 mm or less.

[Object of the Invention] The present invention provides a diode-type dot matrix fluorescent display tube in which a filament and an anode are enclosed facing each other, and in which the anode is divided into blocks formed by a plurality of dot anodes, and The dot block is surrounded by a drain electrode, and each dot block has one filament that emits thermoelectrons, which are placed facing each other.The purpose of this is to provide a high-resolution fluorescent display tube with a simple structure. That's true.

[Description of structure and operation of the invention] An embodiment according to the invention is shown in FIGS. 1 and 2.

The anode 2 coated with the phosphor 1 is divided into a plurality of dot blocks 6, and a drain electrode 7 is arranged around the dot blocks 6 with an insulator 8 in between.

The filaments 4 are arranged one by one at positions facing the dot blocks 6+', and are connected to each dot block 6 by rA.
Emit electrons.

To operate this, the emission of light from the phosphor 10 is controlled by keeping the filament 4 in a thermionic emission state and turning off the anode 2. 2! 1/ of the rib action voltage
A voltage of about 10V is constantly applied, and when there are no dots in the anode block 6 to emit light, emitted electrons from the filament 4 flow in.

With this kind of structure, one filament can control the display of q number of dots facing each other, reduce the size of the trap dots, and use the display tube's resolution method? can be raised. Also, dot block 6 is red and blue.

If it is made of a phosphor that emits green light, it can be used as a dot matrix fluorescent display tube for color display.

[Explanation of Effects] As explained above, the structure in which multiple dot anodes are used to display light emission for one ficimen h and ζ can suppress light emission with fewer filaments than conventional ones, and is capable of achieving large capacity and high resolution. We can provide dot matrix fluorescent display tubes.

1. In the conventional type, the display was controlled by directly turning on and off the filament, so it took time for the filament temperature to reach the specified value, but by turning the anode on and off, the display can be displayed based on this rise time. This has the advantage of eliminating response delays.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment according to the present invention. Figure 2 is an enlarged view of the dot block. Figure 3 shows the conventional 2・* 'F'f
Matrix fluorescent display by jM construction! 1OUr surface view. l...phosphor, 2... anode, 3.
...Substrate glass, 4...Filament,
5...Upper board, 6... Group/dot block, 7...
...Drain electrode, 8...Insulator. Sakai / Illustrated 3 areas

Claims (1)

[Claims] In a diode-type dot matrix fluorescent display tube, in which a filament and an anode are sealed face-to-face in a vacuum container, at least one of which is transparent, the anode is divided into blocks formed by a plurality of dot anodes, and the drain is placed around the dot block. A dot matrix fluorescent display tube surrounded by electrodes and characterized in that each dot block has one filament facing each other that emits thermoelectrons.