JPH05266833A - Graphic fluorescent display panel - Google Patents

Abstract

PURPOSE:To provide a high-precision graphic fluorescent display panel while preventing short-circuiting that was usually caused by the oozing of phosphor layers when dotted segments serving as display patterns are formed by the phosphor layers. CONSTITUTION:A segment electrode of graphite, which has conventionally been formed on a segment electrode 3 of Al, is eliminated, and a first insulating layer 41 having a first opening for covering the circumferential portion of the Al segment electrode and a second insulating layer 42 having a second opening larger in area than the first opening of the first insulating layer 41 are provided. An anode base is used having a structure wherein a phosphor layer 6 is formed by applying and embedding phosphor to and in the first and second openings of the respective first and second insulating layers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic fluorescent display panel.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 3A and 3B, a fluorescent display panel for graphics of this type has a power supply wiring 2 made of an Al sputtered film on an insulating substrate 1 made of a glass substrate. The segment electrode 3 is formed by a photolithography method, an insulating layer 4 having an opening covering the peripheral edge of the segment electrode 3 is applied and formed, and a segment electrode 5 made of graphite is applied and formed in the opening. The anode substrate obtained by applying and forming the phosphor layer 6 so as to cover the segment electrodes 5 was used.

The display pattern composed of the phosphor layer 6 thus obtained has a size of 0.34 × 0.44 mm, for example.
The dot pattern is 0.58 mm wide and 0.71 long
They were regularly arranged in mm pitch.

[0004]

In the conventional fluorescent display panel for graphics, as shown in FIGS. 3 (a) and 3 (b), the phosphor layer 6 is formed so as to cover the segment electrodes 5.
In order to apply and form the phosphor layer 6, when the phosphor layer 6 is applied (generally by screen printing), the adjacent phosphor layer 6 is formed.
Bleeding occurs between the two, causing an electrical short,
There is a problem that the dot shape, which is the display pattern, collapses.

Further, the smaller the dot pitch which is the display pattern, the stronger the tendency is. For example, in the case of the pitch of 0.5 mm in width and 0.65 mm in length, in order to avoid the above-mentioned bleeding, every one printing is performed at the time of screen printing. Since it requires cleaning such as cleaning the screen, it has a big problem in terms of manufacturing man-hours.

An object of the present invention is to provide a fluorescent display panel for graphics which can reduce the number of manufacturing steps without causing an electrical short circuit due to the bleeding of the fluorescent substance and the deformation of the shape of the display pattern.

[0007]

The present invention comprises an insulating substrate,
Dot-shaped segment electrodes made of an Al film formed on the insulating substrate, and power supply wirings connected to the segment electrodes,
In a fluorescent display panel for graphics having an insulating layer having an opening on the segment electrode and covering the power supply wiring, and a phosphor layer connected to the segment electrode,
A first insulating layer having a first opening for covering the peripheral portion of the segment electrode with the insulating layer; a shape similar to the segment electrode at a position corresponding to the first opening, and having an area It has a two-layer structure including a second insulating layer having a second opening larger than the area of the first opening.

[0008]

Embodiments of the present invention will now be described with reference to the drawings.

1 (a) and 1 (b) are a partial cross-sectional view of an anode substrate and a partially enlarged plan view of a phosphor layer thereof according to a first embodiment of the present invention.

In the first embodiment, as shown in FIG. 1 (a),
First, the power supply wiring 2 and the segment electrode 3 made of an Al sputtered film are formed on the insulating substrate 1 made of a glass substrate by the photolithography method.

Next, a first insulating layer 41 having a first opening for covering the periphery of the segment electrode 3 and the power supply wiring 2 is formed.
Apply and form.

Next, a second insulating layer 42 having a second opening larger in area than the first opening of the first insulating layer 41 and having a shape similar to that of the segment electrode 3 is applied and formed.

Next, the first and second insulating layers 41 and 42
The phosphor layer 6 is formed by coating and embedding the phosphor in the first and second openings of the.

The anode substrate thus obtained is shown in FIG.
As shown in (b), the dot-shaped segment composed of the phosphor layer 6 which is the display pattern has a size of 0.25 × 0.40 m.
m, pitch 0.5 mm, length 0.65 mm, width of power supply wiring 2 0.03 mm, pitch 0.06 mm,
Conventionally, the bleeding that occurs when the phosphor layer 6 is applied is avoided by suppressing the protrusion of the phosphor layer 6 out of the pattern at the edge of the opening of the second insulating layer 42, and every time the screen is screened. No need to clean the screen. Further, as a result, the short circuit defect due to the bleeding became 1/20 or less.

FIG. 2 is a partial plan view of an anode substrate according to a second embodiment of the present invention and a partially enlarged plan view of its phosphor layer.

In the second embodiment, as shown in FIG. 2 (a),
First, similarly to the first embodiment, the power supply wiring 2 and the segment electrode 3 made of an Al sputtered film are formed on the insulating substrate 1 made of a glass substrate.

Next, the first and second insulating layers 41 and 42
Are sequentially formed.

Next, a phosphor is applied to and embedded in the first and second openings of the first and second insulating layers 41 and 42 to form a phosphor layer 6 to manufacture an anode substrate.

In this second embodiment, FIG.
As shown in FIG. 3, the dot-shaped segment electrode 3 composed of the phosphor layer 6 which is a display pattern has a size of 0.29 × 0.44 m.
m, pitch horizontal 0.5 mm, vertical 0.65 mm, power supply wiring width 0.03 mm, pitch 0.06 mm.
The dot-shaped segment electrode 2 of the first embodiment shown in (b)
The size of 3 is increased without changing the pitch.

In the formation of the phosphor layer 6, the bleeding of the phosphor layer 6 is achieved even though the distance between the dot-shaped segment electrodes 3 is 0.21 mm, which is smaller than the 0.25 mm of the first embodiment. However, the same effect as that of the first embodiment was obtained.

[0021]

As described above, according to the present invention, there is provided a single layer having a power supply wiring made of an Al sputtered film provided on an insulating substrate and a segment electrode, and a first opening portion covering a peripheral portion of the segment electrode. An insulating layer and a second insulating layer having an area larger than that of the first opening on the segment electrode of the first insulating layer and having a second opening similar to the dot-shaped segment electrode First of the first and second insulating layers
By forming a phosphor layer by coating and embedding the phosphor in the second opening and forming the anode substrate, the bleeding that occurs when the phosphor layer is coated can be reduced to 1/20 or less. There is no need to take measures such as cleaning the screen every time the screen is printed, and the number of manufacturing steps can be greatly reduced.

Further, due to this effect, for example, conventionally, a fluorescent display panel for graphics having dot-shaped segment electrodes with a pitch of 0.5 mm in width and 0.65 mm in length is manufactured without any problem in terms of yield and manufacturing man-hours. It has become possible.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of an anode substrate according to a first embodiment of the present invention and a partially enlarged plan view of a phosphor layer thereof.

FIG. 2 is a partial cross-sectional view of an anode substrate according to a second embodiment of the present invention and a partially enlarged plan view of a phosphor layer thereof.

FIG. 3 is a partial cross-sectional view of an example of an anode substrate of a conventional graphic fluorescent display panel and a partially enlarged plan view of a phosphor layer thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulating substrate 2 Power supply wiring 3,5 Segment electrode 4 Insulating layer 6 Phosphor layer 41 1st insulating layer 42 2nd insulating layer

Claims (1)

[Claims] 1. An insulating substrate, a dot-shaped segment electrode made of an Al film formed on the insulating substrate, a power supply wire connected to the segment electrode, and an opening on the segment electrode, In a fluorescent display panel for graphics having an insulating layer for covering and a phosphor layer connected to the segment electrode, a first insulating layer having a first opening for covering the insulating layer around the segment electrode. And a second insulating layer having a second opening having a shape similar to the segment electrode and having an area larger than the area of the first opening at a position corresponding to the first opening. A fluorescent display panel for graphics, which has a two-layer structure.