JPH0729530A - Fluorescent character display tube - Google Patents

Abstract

PURPOSE:To provide color filters by which light transmissive positive electrode conductors having an opening part can be formed uniformly without deformation and upon which the influence of etching is not exerted when the positive electrode conductors are formed. CONSTITUTION:Light transmissive positive electrode conductors 3 having an opening part 4 are formed uniformly on an undeformed light transmissive positive electrode board 2. A filter material is printed directly on the positive electrode conductors 3 from above, and is exposed from below the positive electrode board 2, and filters R, G and B are formed only in the opening parts 4 of the positive electrode board 2. Phosphor layers 5 are formed on the filters. The phosphor layers 5 are continued directly electrically to the positive electrode conductors 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front emission type fluorescent display tube for observing the light emission of a phosphor layer through a translucent anode conductor and a translucent anode substrate, and in particular, it has a color filter. The present invention relates to a top emission type fluorescent display tube.

[0002]

2. Description of the Related Art Fluorescent display tubes that perform full-color display using color filters are known. FIG. 3 is a partially enlarged view of the fluorescent display tube 100, showing a structure in the vicinity of the anode substrate 101 provided with a display section.

The fluorescent display tube 100 has an envelope having an airtight structure. R (red), G (green), and B (B) are formed on the inner surface of the insulating and translucent anode substrate 101 that forms a part of the envelope.
Three types of band-shaped color filters 1 of each color (blue)
02, 103, and 104 are repeatedly arranged in this order without any gap. On each color filter, a transparent anode conductor 105 having an opening 108 is arranged in a strip shape. A strip-shaped phosphor layer 106 is formed on each anode conductor 105. That is, the strip-shaped phosphor layer 106, together with the strip-shaped anode conductor 105, constitutes a large number of strip-shaped anodes 107 that are parallel to each other at predetermined intervals. The types of phosphors are common, for example, Z having a broad emission spectrum from blue to red centered on green.
An nO: Zn phosphor is used.

Although not shown, a control electrode having a predetermined structure and a cathode for emitting electrons are provided above each of the stripe-shaped anodes 107, and a drive matrix is formed together with the anodes 107. When the fluorescent display tube 100 having such a structure is matrix-driven, each strip-shaped anode 1
In 07, the green light emitted from the phosphor of the selected portion passes through the color filters 102, 103, 104 and the anode substrate 101 through the opening 108 of the anode conductor 105, and the green light of each color filter Observed in color.

When forming the above-mentioned color filter,
Conventionally, a color filter material prepared by mixing a frit glass powder with a pigment of a specific color has been prepared for each required color. Then, each color filter material for each color of the color filter is printed on the anode substrate 101 and dried, and the color filter materials for all colors are printed and dried, and then collectively fired.

[0006]

As described above, since the color filter is formed by firing a color filter material containing an inorganic material as a main component, it is hard to be flat on the anode substrate, and the surface is considerably uneven. Often occurred.

For this reason, it is extremely difficult to uniformly form thin anode conductors each having an opening at a fine pitch of, for example, 1 mm width, and to make the resistance of each anode conductor uniform. It was difficult.
If, for example, an aluminum thin film is used as the anode conductor,
The film thickness may change due to the unevenness of the color filter, resulting in a high resistance value or disconnection.

Further, although the anode conductor can be formed in a stripe shape by etching, there is a problem that the color filter is deteriorated by chemicals used for etching, resulting in unevenness or melting and disconnection.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to uniformly form a translucent anode conductor having an opening without deformation, and to affect etching when forming the anode conductor. It is an object of the present invention to provide a fluorescent display tube having a color filter having a structure not provided.

[0010]

The fluorescent display tube of the present invention comprises:
An envelope having a transparent anode substrate, and a transparent anode conductor having an opening formed on the inner surface of the anode substrate,
In a fluorescent display tube comprising a phosphor layer formed on the anode conductor, and observing light emission of the phosphor layer through the opening of the anode conductor and the anode substrate, at least the opening of the anode conductor. The feature is that a filter is provided in the.

[0011]

[Function] Since the anode conductor is directly provided on the anode substrate,
It can be formed uniformly without deformation. Since the filter is formed on the anode conductor after forming the anode conductor, the filter is not adversely affected by the etching solution used for forming the anode conductor. The phosphor layer and the anode conductor are directly electrically connected.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. The present embodiment relates to a fluorescent display tube 1 capable of performing full-color graphic display.

In the fluorescent display tube 1 of this embodiment, an anode substrate 2 having an insulating property and a light transmitting property shown in FIG. 1 and a cathode substrate having an insulating property (not shown) have an insulating spacer member (not shown) interposed therebetween. It has a box-shaped envelope integrally sealed. The inside of the envelope is kept in a high vacuum state.

As shown in FIG. 1, a large number of strip-shaped anode conductors 3 are arranged in stripes on the inner surface of the anode substrate 2 at predetermined intervals. A plurality of openings 4 are formed in each of the anode conductors 3 to impart a light-transmitting property.

The opening 4 of each anode conductor 3 is covered with color filters R, G and B, respectively. There are three types of color filters, R (red), G (green), and B (blue).
It is of a type and is repeatedly provided in a predetermined order on each anode conductor 3 along the order in which the anode conductors 3 are arranged in parallel.
Each color filter R, G, B is provided in each opening 4 of the anode conductor 3 and is not provided on the upper surface of the anode conductor 3.

A band-shaped phosphor layer 5 is formed on each of the color filters R, G, B and each of the anode conductors 3, respectively. That is, the strip-shaped phosphor layer 5 and the strip-shaped anode conductor 3 constitute a large number of strip-shaped anodes 6 that are parallel to each other at a predetermined interval. In each anode 6, each phosphor layer 5 is in direct contact with each anode conductor 3 to be electrically conductive, and each of the color filters R,
It covers G and B. The type of phosphor is common, and for example, a ZnO: Zn phosphor having a broad emission spectrum from blue to red centered on green is used.

Above the stripe-shaped anode 6, a control electrode 7 having a predetermined structure, a filament-shaped cathode 8 that emits electrons, and the like are provided to form a drive matrix together with the stripe-shaped anode 6.

When the fluorescent display tube 1 having such a structure is matrix-driven and electrons are projected onto a selected portion of the phosphor layer 5 in each strip-shaped anode 6, an anode current is applied to the corresponding anode conductor 3. The phosphor layer 5 emits green light. This light passes through each opening 4 of the anode conductor 3 in which each color filter R, G, B is arranged, and further passes through the anode substrate 2 to observe the color of each color filter R, G, B. To be done.

Main parts of the manufacturing process of the fluorescent display tube 1 will be described. First, the anode conductor 3 having the opening 4 is formed in a stripe shape on the anode substrate 2. The anode conductor 3 can be formed by forming a thin aluminum film on the anode substrate 2, forming a mask on the anode thin film with high precision using a photolithography method, and then performing etching.

Next, a color filter is formed by using the photolithography method. First, a color filter material including an inorganic pigment, a photosensitive resin, and a vehicle is prepared. This color filter material is printed in a strip shape on the upper surface of the anode conductor 3 along the longitudinal direction, and the color filter material is provided on the upper surface of the anode conductor 3 and in each opening. The color filter material is printed for each color and dried each time.

After the printing and drying of the color filter materials of the respective colors are completed, light is irradiated from the outer surface side of the anode substrate 2 to collectively expose the color filter materials by using the anode conductor 3 having the openings 4 as a mask. In the subsequent developing process, the color filter material which has not been exposed is removed, and the color filters R, G and B are formed only in the opening 4. Then, the same type of phosphor is deposited on each anode conductor 3 and each color filter R, G, B by a method such as a printing method, an electrodeposition method, and a photolithography method to form a stripe-shaped anode 6. To do.

In the above manufacturing process, since the anode conductor 3 is directly formed on the anode substrate 2 by the photolithography method, it can be uniformly formed according to a predetermined fine dimension without deformation. Further, since the color filters R, G, B are formed after the anode conductor 3, the chemicals used in the etching process for forming the anode conductor 3 are color filters R, G, B.
There is no fear of adversely affecting G and B.

The color filters R, G and B are
Since the size is approximately the same as or slightly larger than the opening 4 of the anode conductor 3, the emission color of the phosphor layer 5 does not directly go out of the envelope.

Next, a second embodiment will be described with reference to FIG. This embodiment relates to a full-color fluorescent display tube having a striped anode as in the first embodiment, and the basic structure of the display tube is the same as that of the first embodiment. FIG. 2 shows one of the striped anodes on an enlarged scale. The same components as those in the first embodiment are designated by the same reference numerals as those in FIG. 1 and their description is omitted.

An anode conductor 3 having an opening 4 is formed on the anode substrate 2. Insulating color filters r, g, b are formed on the anode conductor 3. A phosphor layer 15 is formed on the color filters r, g, b. Through-holes 17 are formed at important points of the color filters r, g, b, and the phosphor layer 15 is electrically connected to the anode conductor 3 through the through-holes 17.

A method of forming the color filters r, g and b having the above structure will be described. First, a color filter material is solidly printed on the anode conductor 3. Next, a mask is arranged above it, and exposure is performed from above the mask. After the development process,
Color filters r, g, and b having through holes 17 are formed on the anode conductor 3. This color filter r,
A phosphor layer 15 is formed on g and b, and the phosphor layer 15 and the anode conductor 3 are electrically connected through a through hole 17 to form an anode 16.

[0027]

In the fluorescent display tube of the present invention, a color filter is provided in at least the opening of the anode conductor formed on the anode substrate, and the phosphor layer on the anode conductor and the anode conductor are brought into direct electrical contact with each other. It has been configured. Therefore, according to the present invention, the following effects can be obtained.

(1) When the anode conductor is provided on the filter, the anode conductor cannot be formed uniformly unless the surface of the filter is smooth. However, in the present invention, since the anode conductor is directly provided on the anode substrate and the color filter is provided in the opening, unlike the case where the anode conductor is provided on the filter, the smoothness of the surface of the filter does not matter. For this reason, it is possible to use a filter made of a powder laminated film or the like.

(2) Since the phosphor layer and the anode conductor are in direct contact with each other, there is no problem even if the filter is an insulator.

(3) When the color filter is formed, 400 to
Although the anode substrate tends to be deformed because it is fired in the air at 600 ° C., since the anode conductor is directly formed on the anode substrate without any deformation before forming the color filter, a fine anode conductor pattern can be realized.

(4) Since the color filter is formed after forming the anode conductor, there is no possibility that the etching solution used for forming the anode conductor deteriorates the color filter.

[Brief description of drawings]

FIG. 1 is a partially enlarged cross-sectional view near an anode substrate of an image display device that is a first embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view near an anode substrate of an image display device according to a second embodiment of the present invention.

FIG. 3 is a partially enlarged cross-sectional view in the vicinity of an anode substrate of a conventional fluorescent display device including a color filter.

[Explanation of symbols]

 1 Fluorescent Display Tube 2 Anode Substrate 3 Anode Conductor 4 Opening 5,15 Phosphor Layer 6,16 Anode R, G, B, r, g, b Color Filter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eiji Sato 629 Oshiba, Mobara-shi, Chiba Futaba Electronics Co., Ltd.

Claims (1)

[Claims] 1. An envelope having a translucent anode substrate, a translucent anode conductor having an opening formed on an inner surface of the anode substrate, and fluorescent light formed on the anode conductor. In a fluorescent display tube comprising a body layer and observing the light emission of the phosphor layer through the opening of the anode conductor and the anode substrate, a filter is provided at least in the opening of the anode conductor. Fluorescent display tube.