JPH04253142A - fluorescent display tube - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display tube, and more particularly to a fluorescent display tube mounted adjacent to other light emitting elements.

0002

2. Description of the Related Art A conventional fluorescent display tube, as shown in FIG. , the phosphor layer 5 is coated and formed to form an anode substrate, and then the phosphor layer 5 is formed by coating.
A fluorescent display tube was obtained by arranging a grid 6 and a filament 7 at opposite positions, and further sealing a cover glass 8 made of light-transmitting colorless glass to an anode substrate and vacuum-sealing. Note that the cover glass 8 is composed of a spacer section 81 and a display surface section 82 forming a side surface.

0003

[Problems to be Solved by the Invention] Conventional fluorescent display tubes are
Since the spacer part that forms the side surface of the cover glass is made of translucent colorless glass, external light around the fluorescent display tube (e.g.
During mounting, the visibility of the display is impaired because light emitted from the light emitting elements set around the spacer passes through the spacer section and enters the fluorescent display tube. There is a problem in that the light emitted leaks from the spacer portion, resulting in a problem that impairs the visibility of other light emitting elements.

The purpose of the present invention is to reduce the visibility of display due to the entry of light emitted from other light emitting elements in the periphery, which occurs during set mounting, and the visibility of other light emitting elements in the periphery due to the leakage of light. It is an object of the present invention to provide a fluorescent display tube that can prevent both deterioration of the fluorescent display tube.

[0005]

[Means for Solving the Problems] The present invention includes a glass substrate, an electrode layer formed on the glass substrate, a phosphor layer coated on the electrode layer, and a wiring layer connected to the electrode layer. An anode substrate, a filament stretched across the phosphor layer at intervals, a grid placed between the filament and the phosphor layer, and a spacer portion are sealed to the anode substrate to form a vacuum-tight container. The fluorescent display tube has a structure in which a light-shielding film made of light-shielding colored glass is formed on at least a part of the spacer portion.

[0006]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a main part of a first embodiment of the present invention.

In the first embodiment, as shown in FIG. 1, first, a wiring layer 2 of Al is formed on a glass substrate 1, an insulating layer 3 covering the wiring layer 2, and a phosphor layer 5. An electrode layer 4 and a phosphor layer 5, which serve as a base, are sequentially coated to form an anode substrate. Furthermore, a grid 6 and a filament 7 are arranged at a position facing the phosphor layer 5.

Next, a light-shielding colored glass is applied to one side of the cover glass 8 in advance by screen printing, and the spacer portion 81 and display surface portion 82, on which a light-shielding film 85 is formed, are baked and integrated with low-melting glass. form by becoming

Next, this cover glass 8 is placed on a grid 6,
A fluorescent display tube was manufactured by sealing the anode substrate on which the filament 7 was placed and vacuum sealing.

A light-shielding film 8 is formed on the spacer portion 81 thus obtained.
The fluorescent display tube formed with 5 suppresses the entry of outside light to 10% or less (compared to conventional products) when mounted as a set, and conversely also prevents the leakage of light emitted from the display of the fluorescent display tube to the outside. became possible.

FIG. 2 is a sectional view of a main part of a second embodiment of the present invention.

As shown in FIG. 2, the second embodiment is applicable to a so-called flat-emitting type fluorescent display tube in which a display consisting of luminescence of a phosphor is observed from the anode substrate surface opposite to the surface coated with the phosphor layer 5. This is an example.

In the cover glass 8 used in this embodiment, a light-shielding film 85 made of light-shielding colored glass is formed on one side of the spacer portion 81, and the display surface portion 82 is
and low melting point glass were used. Note that a graphite layer 83 is coated on the inside of the display surface portion 82 in order to provide conductivity and light shielding properties.

Similar to the first embodiment, the fluorescent display tube of the second embodiment reduces the entry of external light and the leakage of light to the outside by 10%.
% or less (compared to conventional products).

It should be noted that when it is not necessary to form the light-shielding film 85 on all of the spacer parts 81, for example, when external light enters only from one direction during set mounting, It has been confirmed that sufficient effects can be achieved by forming the light-shielding film 85 made of light-shielding colored glass.

[0017]

As explained above, the fluorescent display tube of the present invention has a structure in which a light-shielding film made of light-shielding colored glass is coated on at least a part of the spacer portion constituting the side surface of the cover glass. When mounted as a set, the entry of light generated from other light emitting elements in the surrounding area is suppressed to 10% or less (compared to conventional models), and the visibility of the display is not impaired. It is also possible to prevent leakage to other light-emitting elements, and there is an effect that the visibility of the display of other surrounding light-emitting elements is not impaired.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is a sectional view of a second embodiment of the invention.

FIG. 3 is a sectional view of a main part of an example of a conventional fluorescent display tube.

[Explanation of symbols]

1 Glass substrate 2 Wiring layer 3 Insulating layer 4 Electrode layer 5 Phosphor layer 6 Grid 7 Filament 8 Cover glass 81 Spacer part 82 Display surface section 83 Graphite layer 85 Light-shielding film

Claims (1)

[Claims] 1. An anode substrate comprising a glass substrate, an electrode layer formed on the glass substrate, a phosphor layer coated on the electrode layer, and a wiring layer connected to the electrode layer, and the phosphor layer. A fluorescent display comprising a filament stretched at intervals, a grid disposed between the filament and the phosphor layer, and a cover glass having a spacer portion sealed to the anode substrate and forming a vacuum-tight container. 1. A fluorescent display tube, characterized in that the tube has a structure in which a light-shielding film made of light-shielding colored glass is formed on at least a part of the spacer portion.