JPH03159041A - Fluorescent character display tube - Google Patents

Abstract

PURPOSE:To obtain a character display condition having shading and a feeling of stereoscopic vision by forming the pattern of a phosphor layer to be laid across both the pattern of a conductive segment layer and the pattern of an insulating layer. CONSTITUTION:There are provided an anodic substrate obtained through the process of forming the pattern of a conductive wiring 2, the pattern of an insulating layer 3, the pattern of a conductive segment layer 5 and the pattern of a phosphor layer 6 in this sequence on a glass substrate 1, cathodic filaments 8, a grid electrode 9 in the shape of a grid and a cover glass 7. The phosphor layer 6 whose contour is shown by a solid line is formed to be protruded partly from the conductive segment layer 5 whose contour is shown by a broken line, and an anodic potential applied from a lead terminal 4 via the conductive wiring 2 is consequently decreased by the amount of resistance in the phosphor layer 6 to have low brightness, in the hatched protruded phosphor portion. This provides a character display condition having shading and a feeling of stereoscopic vision.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluorescent display tube, and more particularly to a fluorescent display tube with an improved structure of an anode substrate.

[Conventional technology]

Fluorescent display tubes are widely used as flat panel displays that are easy to see and can emit high-intensity light. However, there is a growing demand for higher display quality and higher display content.

For example, there is a demand for adding shading to the display to give it a three-dimensional effect and depth. Conventionally, the method shown in FIG. 4 has been used to meet this request. That is, first, the conductor wiring 2 is formed on the glass substrate 1 using a thick silver film or a thin aluminum film. The conductor wiring 2 is covered with an insulating layer 3 except for a part, and one side is electrically connected to the lead terminal 4 and the other side is electrically connected to the conductor segment layer 5 via a through hole. In order to attach the conductor segment layer 5
The phosphor layer formed thereon is formed by separately painting a high-brightness phosphor layer 46 and a low-brightness phosphor layer 47 in a predetermined pattern.
The difference in brightness between the two phosphor layers was used to create a display with shadows and a three-dimensional effect.

Also, as shown in the same figure, the anode substrate and cover glass cover are
It forms a vacuum vessel, in which a cathode filament 8 and a grid electrode 9 are further installed.

[Problem to be solved by the invention]

In the conventional fluorescent display tube described above, two types of phosphors are coated separately, which not only complicates the manufacturing process, but also requires a gap between the two phosphor patterns, making it difficult to obtain good display conditions. There was a drawback that there was no

An object of the present invention is to provide a trend display tube that provides a good display condition.

[Means to solve the problem]

The present invention provides a fluorescent light source having a fS anode substrate, a cathode filament, a lattice-shaped grid electrode, and a cover glass by sequentially forming a conductor wiring pattern, an insulating layer pattern, a conductor segment layer pattern, and a phosphor layer pattern on a glass substrate. The display tube has a structure in which the phosphor layer pattern is formed across the conductor segment layer pattern and the insulating layer pattern in a predetermined shape.

〔Example〕

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

FIG. 1 is a longitudinal sectional view of a first embodiment of the fluorescent display tube of the present invention, and FIG. 2 is a plan view showing the laminated relationship between the phosphor layer and the conductor segment layer of FIG. 1.

In the first embodiment, as shown in FIG. 1, conductive wiring 2 is formed on a glass substrate 1 using a thick silver film or a thin aluminum film. The conductor wiring 2 is covered with an insulating layer 3 except for a part, and one side is connected to a lead terminal 4 and the other side is connected to a conductor segment layer 5 via a through hole. As mentioned above, the phosphor layer 6 is composed of the conductor segment layer 5 and the insulating layer 3.
It is formed across the

Further, as shown in the figure, the anode substrate with the above structure forms a vacuum container together with the cover glass 7, and the cathode filament 8 and the grid electrode f! It stores 9.

The phosphor layer pattern and the conductor segment layer pattern have a laminated relationship as shown in FIG. That is, the phosphor layer 6 whose outline is shown by a solid line is formed so as to partially protrude from the conductor segment layer 5 whose outline is shown by a broken line. In this structure, the protruding phosphor layer 6 in the shaded area is shaded because the anode potential applied from the lead terminal through the conductor wiring is reduced by the resistance of the phosphor M6. A light emitting display state like this can be obtained.

FIG. 3 is a plan view showing the laminated relationship between the phosphor layer and the conductor segment layer of the second embodiment of the fluorescent display tube of the present invention.

In the second embodiment, as shown in FIG. 3, the conductor segment layer 32 shown by the broken line, which is formed as the lower layer of the phosphor layer 6 shown by the solid line, is formed into an arbitrary shape. A phosphor layer 6 corresponding to the outer side and shown by diagonal lines in the figure
Since the brightness of the portion is low, a predetermined shadow shape is formed, and more complex display information and higher display quality can be obtained.

〔Effect of the invention〕

As described above, the present invention has the effect that a display state with shadows and a three-dimensional effect can be obtained by forming a phosphor layer pattern across both a conductor segment layer pattern and an insulating layer.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a first embodiment of a fluorescent display tube of the present invention, FIG. 2 is a plan view showing the laminated relationship between the phosphor layer and the conductor segment layer of FIG. 1, and FIG. 3 is a diagram of the present invention. FIG. 4 is a plan view showing the laminated relationship between the phosphor layer and the conductor segment layer of the second embodiment, and FIG. 4 is a longitudinal sectional view of an example of a conventional fluorescent display tube. DESCRIPTION OF SYMBOLS 1... Glass substrate, 2... Conductor wiring, 3... Insulating layer, 4... Lead terminal, 5, 32... Conductor segment layer, 6... Phosphor layer 7... Fluorescence body layer, 7... cover glass, 8... cathode filament, 9... grid electrode, 46... high brightness phosphor layer, 47... low brightness phosphor layer.

Claims (1)

[Claims] A fluorescent display tube having an anode substrate in which a conductor wiring pattern, an insulating layer pattern, a conductor segment layer pattern, and a phosphor layer pattern are sequentially formed on a glass substrate, a cathode filament, a lattice-like grid electrode, and a cover glass. 1. A fluorescent display tube, characterized in that a phosphor layer pattern is formed to span the conductor segment layer pattern and the insulating layer pattern in a predetermined shape.