JPH0220752Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a fluorescent display tube that displays numbers, symbols, designs, etc. by emitting light from a fluorescent substance.

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 top of the anode electrode group, and a fluorescent substance is applied to form the electrode of the anode substrate to display light emission from the fluorescent substance. This invention relates to a fluorescent display tube which is designed to be observed from the opposite side. Hereinafter, this structure will be referred to as a back-emission display.

FIG. 1 is a partially enlarged view showing the electrode structure of a conventional back-emitting fluorescent display tube.
A conductive material such as Al is applied on the surface by a sputtering method, etc., and a conductive material such as Al is provided by a photoetching method.
A power supply line 2 and a translucent segment electrode 3 are formed, and the power supply line 2 is covered with an insulating layer 4 except for the segment electrode portion. ZnO is deposited on the upper surface of the transparent segment electrode 3 by electrophoresis or printing method.
- A fluorescent material layer 5 is formed by depositing a fluorescent material such as Zn.

Electrons emitted from the filament cathode 6 are accelerated by the grid electrode 7 and impact the fluorescent material 5.
Makes a phosphor emit light. The display has a structure in which the image is observed through a light-transmitting segment electrode 3 and a transparent insulating substrate 1. However, with the recent diversification of display contents, the demand for multi-color display has become stronger. Because the composition has to be changed and the fluorescent substance application work has to be repeated to match the emitted color, the work process becomes more complex and increases compared to conventional single-color products, leading to lower yields and higher costs. This was a contributing factor.

Furthermore, since the composition of the fluorescent material changes depending on the color of the emitted light, the luminance level of the emitted light varies depending on the color pattern of the emitted light, which is a factor in deteriorating the display quality.

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

According to the present invention, a fluorescent substance is formed on an anode substrate forming an airtight container to form a display pattern, and electrons emitted from the filament are bombarded with the fluorescent substance to emit light, while the electrode-formed surface of the anode substrate In a fluorescent display tube having a structure in which the display is observed from the opposite side, a transparent colored film is formed at a position corresponding to the display pattern on the inner surface of the anode substrate on which the display is observed,
In addition, by forming a colored film representing desired characters, symbols, designs, etc. on the outer surface of the anode substrate of the display section, it is possible to easily generate multiple light-emitting lights by combining the fluorescent material and the translucent colored films on the inner and outer surfaces of the substrate. It is possible to provide a multi-color display back-emitting fluorescent display tube that provides various colors, is inexpensive, and has excellent display quality.

Hereinafter, the details will be explained using one embodiment of the present invention. Figure 2 is a partially enlarged view showing the electrode structure of the multicolor display and back-emitting fluorescent display tube according to the present invention. A colored glass paste made by adding a pigment or dye to a low melting point glass powder as the main component was pattern printed by screen printing and then baked to form a translucent colored film 8 having a thickness of about 10 μm. Next, Al was sputtered to a thickness of 1 to 1.5 μm.
Width 50-100μ by photoetching method
Pitch 150μm with feed line 2 of m and line width of 20μm
A mesh-like segment electrode 3 is formed, and the electrode 3
The feeder line 2 is covered with an insulating layer 4 except for the portion shown in FIG. A fluorescent material layer 5 is formed by depositing a ZnO--Zn fluorescent material on the upper and side surfaces of the mesh-shaped segment electrode 3 by electrophoresis.

From then on, the fluorescent display tube was manufactured using the same process as before. Next, on the observation side of the display tube, a pattern of approximately 20 μm thick epoxy/acrylate-based ultraviolet curable ink with high transmittance is printed on the outer surface of the insulating substrate 1 at a position corresponding to the display pattern using a screen printing method. In this fluorescent display tube, in which a transparent colored film 81 is formed by irradiating ultraviolet rays to the fluorescent material, electrons emitted from the filament cathode 6 are accelerated by the grid electrode 7, impact the fluorescent substance layer 5, and cause the phosphor to become phosphor. It has a structure that emits light.

Here, the fluorescent material layer 5 is made of ZnO which emits blue-green light.
For example, a translucent red film 8 is formed on the inner surface of the translucent substrate 1, and a yellow colored coating 81 is further formed on the outer surface of the substrate except for portions 83 such as desired characters.
is printed in a pattern as shown in Figure 3, and when it is lit and displayed, the text part emits red light due to the filter effect of the translucent red film formed on the inner surface, and the parts other than the text are colored by the coloring of the inner and outer surfaces of the board. A composite color tone of the film, ie an orange emission color, is obtained.

As described above, according to the present invention, various combinations of display colors and display patterns are possible using only one type of phosphor. In addition, unlike conventional multicolor back-emitting fluorescent display tubes, multicolor back-emitting fluorescent display tubes with high brightness and stable display quality are free from uneven luminance between display patterns due to differences in the composition of fluorescent substances. Obtained.
Furthermore, even with the same luminescent color, the desired chromaticity could be easily obtained by changing the proportions of dye and pigment in the translucent colored film material.

Furthermore, in response to demands for emitted light colors, a wide variety of emitted light colors can be obtained by combining light-transmitting coatings on the inner and outer surfaces of the insulating substrate without changing the composition of each individual phosphor, thereby reducing the cost of the phosphor. reduction, productivity improvement,
And we were able to significantly reduce product costs.

Although a simple embodiment has been described above, it is clear that the present invention is not limited to the translucent color tone and pattern shape of the colored film. or,
It goes without saying that the material of the colored film and the method of forming it are not limited to those of the above embodiments.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged view showing the structure of a conventional back-emitting display type fluorescent display tube. FIG. 2 is a partially enlarged view showing the structure of a back-emitting display type fluorescent display tube according to the present invention. FIG. 3 is a plan view of the outer colored film 81 shown in FIG. 2. 1... Translucent insulating substrate, 2... Power supply line, 3...
Mesh segment electrode, 4... Insulating layer, 5...
Fluorescent material layer, 6... Filament cathode, 7... Grid electrode, 8... Inner transparent colored film, 81...
External colored film.

Claims (1)

[Scope of utility model registration request] A fluorescent material is coated on a transparent anode substrate constituting an airtight container to form a display pattern, and electrons emitted from the filament are bombarded with the fluorescent material to cause it to emit light, while the surface of the transparent anode substrate opposite to the electrode formation surface is applied. In a fluorescent display tube for viewing the display, a light-transmitting colored film is formed on the inner surface of the anode substrate corresponding to the display pattern, and a light-transmitting colored film representing characters, symbols, or designs is formed on the outer surface of the anode substrate corresponding to the display pattern. A fluorescent display tube characterized by forming a coloring film.