JPH037018Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a fluorescent display tube having a structure in which a pattern display section consisting of a plurality of segments and other signal display sections are arranged on the same insulating substrate. This invention relates to a fluorescent display tube with improved display quality in a signal display section.

[Conventional technology]

For example, as a fluorescent display tube used in audio equipment, there is a multifunctional fluorescent display tube that includes a pattern display section that displays various information in segments and bars, and a signal display section that displays signals. In such a multifunctional fluorescent display tube, the wiring layer for leading out each segment of the pattern display section is severely limited due to space limitations.
Usually, a method is adopted in which the wiring layer is led out through the lower part of the signal display section.

FIGS. 1a and 1b are a schematic plan view and a partial cross-sectional view showing an example of the wiring structure of the display section,
On an insulating substrate 1 made of glass or the like, there are a multi-digit pattern display section 3 ₁ , 3 ₂ , . are placed on the same plane. Each segment 2a to 2g of the pattern display portions 3 ₁ , 3 ₂ , . . . is formed by a wiring layer 5a to 5g made of silver or the like and formed with a predetermined pattern on the surface of the insulating substrate 1 by a printing method.
and are electrically connected to each other through through holes on the insulating layer 6, and these wiring layers 5a to 5
After g, the wiring layers 5a to 5e form the signal display section 4.
is derived through the lower position of . Further, a base electrode layer 7 made of carbon or the like is formed on a part of the insulating layer 6 that insulates the wiring layers 5a to 5g by a printing method, and a shape (REC) shown in the figure is formed on the base electrode layer 7. A phosphor layer 8 is formed to have a phosphor pattern, and the base electrode layer 7 and the phosphor layer 8 constitute the signal display section 4. In FIG. 1, reference numeral 10 is a wiring layer electrically connected to the base electrode layer 7 of the signal display section 4, and 11 and 12 shown with diagonal lines are patterns different from the pattern display sections 3 ₁ , 3 ₂ . . . Wiring regions each having a wiring layer leading to each segment of the display section are shown.

By the way, in the fluorescent display tube having such a structure, when displaying by dynamically driving the pattern display sections 3 ₁ , 3 ₂ , . . . and the signal display section 4,
With the signal display section 4 illuminated,
When the pattern display sections 3 ₁ , 3 ₂ , . Disturbances in the electric field occur. Therefore, as shown in FIG.
This causes flicker-like unevenness, which is a factor in degrading display quality.

[Summary of the idea]

This invention was made in view of the above points,
In a device in which wiring layers electrically connected to each segment of the pattern display section are led out through the lower part of the signal display section, the resistance of the base electrode layer of the phosphor layer that displays the signal is reduced, and the base electrode layer is It is an object of the present invention to provide a fluorescent display tube in which the display quality of the signal display section is improved by suppressing the electric field from the wiring line by the wiring layer and increasing the light emitting efficiency by increasing the potential of the wiring layer. Hereinafter, embodiments of the present invention will be described based on the drawings.

〔Example〕

FIGS. 3a and 3b are a schematic plan view and a partial cross-sectional view of the wiring structure of the display section of a fluorescent display tube according to an embodiment of the present invention, and the same or corresponding parts as in FIG. 1 are the same. A code is attached.
In this embodiment, Japanese character segments 2a to 2g
The pattern display portions 3 ₁ , 3 ₂ , . . . and the signal display portion 4 are arranged on the same insulating substrate 1, and each segment 2a to 3 of the pattern display portions 3 ₁ , 3 ₂ , .
Wiring layers 5a to 2g are electrically connected to each other.
5e is led out through the lower part of the signal display section 4, which is similar to the conventional one shown in FIG. A carbon electrode layer 7 is formed as a carbon electrode layer 7, and a silver conductive layer 9 is formed as a conductive layer on the back surface of the carbon electrode layer 7 in a lattice shape or a solid shape by a printing method. By depositing a phosphor layer 8 having a body pattern (REC), the signal display section 3 is constituted by the carbon electrode layer 7, the silver conductive layer 9, and the phosphor layer 8.

As described above, according to the configuration of the above embodiment, a grid-like or solid silver conductive layer 9 is also formed on the bottom surface of the carbon electrode layer 7 on which the phosphor layer 8 is deposited so as to cover each of the wiring layers 5a to 5e. By providing this silver conductive layer 9, together with the lower resistance of the carbon electrode layer 7, the silver conductive layer 9 has the effect of suppressing the electric field due to the potential increase. Therefore, each of the daily character segments 2a to 2g of the pattern display portions 3 ₁ , 3 ₂ , ...
When dynamically driving the signal display section 4, a constant electric field is applied to the signal display section 4 without being affected by the electric field from the wiring line. Therefore, the light emitting portion of the phosphor layer 8 emits light uniformly over the entire surface without causing uneven light emission such as partial flickering as in the conventional case, thereby improving display quality. Furthermore, the luminous efficiency of the phosphor layer 8 can be increased by increasing the potential of the carbon electrode layer 7.

In addition, as the base electrode layer of the signal display section 4, in addition to the carbon electrode layer, an electrode layer with good adhesion to the phosphor layer is applied, and in addition to the silver conductive layer, the conductive layer is also a conductive layer that lowers the resistance of the base electrode layer. It can also be formed from a material.

[Effect of idea]

As explained above, according to the present invention, in a fluorescent display tube having a structure in which the wiring layers connected to each segment of the pattern display section are led out through the lower position of the signal display section, the base electrode of the signal display section By lowering the resistance of the base electrode layer and providing a conductive layer on the bottom surface of the layer so as to cover the wiring layer, the light emitting efficiency can be increased by increasing the potential of the base electrode layer, and the wiring The layer is no longer affected by the electric field from each wiring line, and therefore the display quality of the signal display section can be improved, and the luminous efficiency thereof can also be improved.

[Brief explanation of the drawing]

Figures 1a and b are schematic plan views and partial cross-sectional views showing the wiring structure of the display section of a conventional fluorescent display tube, and Figure 2 is an explanation showing the state of uneven light emission in the signal display section of Figure 1. 3A and 3B are a schematic plan view and a partial sectional view thereof corresponding to FIG. 1, showing a fluorescent display tube according to an embodiment of the present invention. 1...Insulating substrate, 2a to 2g...Segment,
3 ₁ , 3 ₂ ... Pattern display section, 4 ... Signal display section, 5a to 5g ... Wiring layer, 6 ... Insulating layer, 7
... Base electrode layer (carbon electrode layer), 8 ... Phosphor layer, 9 ... Silver conductive layer, 10 ... Wiring layer.

Claims (1)

[Scope of utility model registration request] A pattern display section and a signal display section consisting of a plurality of segments are arranged on the same insulating substrate, and a wiring layer electrically connected to each segment of the pattern display section is led out through a lower position of the signal display section. In the fluorescent display tube having a structure, the signal display section includes a base electrode layer made of carbon or the like formed on a part of an insulating layer that insulates the wiring layer, and a base electrode layer on the bottom surface of the base electrode layer. A conductive layer made of a conductive material that has a low resistance and is applied to cover the wiring layer, and a phosphor layer formed with a predetermined phosphor pattern on the base electrode layer. A fluorescent display tube characterized by: