JPS59198643A - Fluorescent character display tube - Google Patents

Abstract

PURPOSE:To realize cost down of a rear surface liminance type multi-color phosphor display tube and improve the grade of display by impregnating the surface which will become the electrode forming surface with a metal or metal compound in the form of ion and providing an optically transparent anode substrate forming a colored layer in the vicinity of surface. CONSTITUTION:As an optically transparent anode substrate 1, it is impregnated with a metal or metal compound in the form of ion from the surface which will become the electrode forming surface, and provided with formation of colored layer in the vicinity of surface. For example, a Cu coloration film 11 consisting of the mixed powder of Al2O3 and Cu2S is formed on the surface of a glass plate 1 and an AG coloration film 12 consisting of the mixed powder of Al2O3 and AgCl is formed thereafter. Thereafter, these are baked and thereby Cu<+>, Ag<+> are caused to enter the glass plate 1 through replacement with Na<+> ion in the glass plate 1. Then, the films 11, 12 are mechanically removed, and Cu and Ag atoms are reduced through the heat treatment under the hydrogen ambient. Thereby, a glass plate 1 having the red-colored layer 13 and yellow- colored layer 14 can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a fluorescent display tube that displays numbers, symbols, patterns, etc. by emitting light from a fluorescent substance.

Conventionally, this type of display tube has an insulating substrate 1 as shown in FIG.
An anode feeder line is placed on top using non-transparent Ag wiring, a black insulating layer with through holes is provided on top of it, and electrodes are formed with graphite or the like at positions corresponding to the through holes, and then A grid 5 is arranged at an appropriate distance from the anode at a position corresponding to the anode on an anode substrate coated with a fluorescent substance, and a filament 6 is arranged at an appropriate distance from the grid 5. Further, a structure is provided in which a cover glass 7 whose inner surface is coated with a transparent conductive film is sealed to an anode substrate to form a vacuum-tight container. however,
All of these display tubes had the disadvantage that the display field of view was narrow because the display was observed from the top surface of the cover glass.

In contrast, the insulating substrate is made translucent, the anode electrode group disposed on the insulating substrate is made transparent or a translucent electrode, and a fluorescent substance is coated on the anode electrode group, and a fluorescent substance is applied onto the anode electrode. A fluorescent display tube configured to be observed from the side opposite to the electrode-forming surface can have a display field of view that is far superior to that of a fluorescent display tube with a conventional structure. Hereinafter, a fluorescent display tube with this structure will be referred to as a back-emitting type fluorescent display tube. Figure 2 is a partially enlarged view showing the electrode structure of a conventional back-emitting type fluorescent display tube. A conductive material such as A7 is applied by a sputtering method or the like, and a power supply line 4 and a transparent segment electrode 32 are formed by a photoetching method or the like. It is contacted by an insulating layer 2.

A fluorescent material such as Zn0-Zn is deposited on the upper surface of the translucent segment electrode 32 by electrophoresis or printing to form a fluorescent material layer 33.

Electrons emitted from the filament cathode 6 are accelerated by the grid electrode 5 and collide with the phosphor layer 33, causing the phosphor to emit light. The display has a structure in which C is observed through the translucent segment electrodes 32 and the transparent insulating substrate 1.

However, recently, with the diversification of display peaks and troughs, the demand for multicolor display has increased, and in order to realize this, fluorescent materials 3
3 changes the composition of the phosphor material according to the user's requirements for the emitted light color for each display pattern (7) Because it is necessary to use phosphors of various emitting colors, the phosphor composition is different from that of conventional single-color fluorescent display tubes. The cost has increased, and this has become a device that increases the cost of the product.

Historically, the composition of the fluorescent material changes depending on the color of the emitted light.
Non-uniformity of luminance due to the difference in luminous color occurs, which also makes the display difficult to see.

The present invention aims at reducing the cost and improving the display quality of these back-emitting multicolor fluorescent display tubes.

According to the present invention, a display pattern is formed by coating a fluorescent substance on a transparent anode substrate that forms an airtight container, and electrons emitted from a filament collide with the fluorescent substance to emit light at °C. In a multicolor fluorescent display tube having a structure in which the display is observed from the opposite side of the electrode-forming surface of the anode substrate, a metal or a metal compound is injected from the surface of the transparent anode substrate that will become the electrode-forming surface. By using a glass plate colored at least near the surface by an impregnating method, it is possible to provide a back-emitting multicolor fluorescent display tube with low cost and excellent display quality.

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 3 is a partially enlarged view showing the manufacturing process of the embodiment of the present invention.

In Fig. 3, a mixed powder of 90 parts by weight of AAzOa powder and 25 parts by weight of Cu251O is kneaded with a binder to form a paste on the surface of a soda lime glass plate 1 having a thickness of 1.8 cm, and is printed using a printing method. Coat to a thickness of 200 to 250μ
The Cu coloring film 11 was prepared as follows.

Furthermore, a mixed powder of 80 parts by weight of A7zOa powder and 80 parts by weight of AgCl2O was applied in the same manner to a thickness of 200 to 25 parts by weight.
The Ag coloring film 12 had a thickness of 0μ.

Next, the glass plate 1 on which the colored coatings 11 and 12 are formed
= 650-700℃ in air after drying at 2oo℃
By firing for 10 to 30 minutes, υ, Cu ions/and Ag ions/ions were allowed to penetrate into the glass plate 1 by exchanging the ions with Na+ ions in the glass plate 1. After cooling the glass plate 1 that has undergone ion exchange, the residual powder layer containing A120a as the main component of the coloring coatings 11 and 12 on the surface is mechanically removed, and then a 650~
700℃.

Heating was performed for 30 to 60 minutes to reduce Cu and Ag atoms.

Through the above operations, a transparent colored layer could be formed, and the glass plate 1 having the red colored layer 13 and the yellow colored layer 14 shown in FIG. 4 was obtained.

Thereafter, a back-emitting type fluorescent display tube was manufactured using the glass plate 1 as an anode substrate in the same process as the conventional method.

In this fluorescent display tube, electrons emitted from the filament cathode 6 are accelerated by the grid electrode 5 and the phosphor 33
One part of the light emitted by colliding with the coloring layer passes through the red colored layer 13, one part passes through the yellow colored layer 14, and one part does not pass through the colored layer and is taken out as it is. Since three-color display can be performed using different types of phosphors, there is no unevenness in luminance between display patterns due to differences in phosphor composition, which is the case with conventional back-emitting multicolor fluorescent display tubes, allowing for safe display. A back-emitting multicolor fluorescent display tube with improved quality can be obtained.

Although the present invention has been described above based on examples, the spirit of the present invention is to provide a back-emitting multicolor fluorescent display tube that is inexpensive and has high display quality by using a transparent glass anode substrate provided with a colored layer on the surface. It is clear that any changes in the type of ions used in the interstitial process and in the method thereof do not depart from the spirit of the invention.

[Brief explanation of drawings]

FIG. 1 is a cutaway perspective view of a fluorescent display tube of a conventional display method. FIG. 2 is a partially enlarged sectional view showing the structure of a conventional back-emission display type fluorescent display tube. FIG. 3 is a partially enlarged sectional view showing the manufacturing process of a back-emission display type multicolor fluorescent light tube according to the present invention. FIG. 4 is a partially enlarged cross-sectional view showing the structure of a back-emission multicolor fluorescent display according to the present invention. In the figure, 1... translucent glass 1 odor electrode substrate,
2... Insulating layer, 3... Display pattern,
4...Feeding line, 5...°...Grid electrode,
6P...Filament cathode, 7---Cover glass, 32...Mesh segment electrode, 33
... Phosphor, 11 ... Cu coloring film, 12 ... Ag coloring film, 13 ...
Red colored layer, 14...Yellow colored layer.

Claims (1)

[Claims] A display pattern is formed by coating a fluorescent material on a transparent anode substrate constituting an airtight container, and electrons emitted from the filament collide with the fluorescent material to emit light at °C while the electrode forming surface of the transparent anode substrate is coated. In a fluorescent display tube in which the display is viewed from the opposite side, the transparent anode substrate is impregnated with a metal or a metal compound in the form of ions from the surface of the transparent anode substrate that is to be the electrode forming surface to form a colored layer near the surface. 1. A fluorescent display tube characterized by having a positive anode substrate.