JPH0723897Y2 - Fluorescent display tube - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display tube for displaying characters and figures, and more particularly to positioning of internal electrodes.

[0002]

2. Description of the Related Art A fluorescent display tube comprises a cathode for emitting electrons, a control electrode for controlling the electrons emitted from the cathode, and an electron bombardment inside an airtight envelope whose inside is kept in a high vacuum state. A display unit or the like having a phosphor layer that emits light is arranged.

More specifically, the display portion is provided on the inner surface of the front plate forming a part of the airtight envelope, and is formed by an anode conductor made of an Al thin film or the like, and the inner surface of the anode conductor is desired to project by electrons. Is provided with a phosphor layer that emits light of the above emission color.

Further, the fluorescent display tube has been
In the past, the focus was on fixed pattern display, but in recent years, graphic fluorescent display tubes that can arbitrarily display characters, numbers, figures, etc. have been used.

The fluorescent display tube for graphic display is divided into several types according to the display selection method. As one of them, an anode conductor is formed in a stripe shape, a phosphor layer is arranged on the upper surface thereof, and a linear control electrode is stretched in a direction orthogonal to the anode conductor, and a control electrode and an anode conductor are formed. To select the display. In another example, the anode conductor and the phosphor layer are formed in a solid shape, and the display is selected only by the control electrodes arranged in a matrix.

FIG. 2 is a diagram showing an example of a conventional fluorescent display tube, and FIG. 3 is an enlarged plan view of its essential part. The fluorescent display tube A is hermetically sealed by forming a back plate 1 made of a glass plate or the like, a side plate 2 and a front plate 3 forming a side surface part together with a sealing material 4 made of a low melting point frit glass or the like interposed therebetween. It constitutes the envelope.

The fluorescent display tube A has a linear cathode 9 stretched around the inner surface of the back plate 1 and emits thermoelectrons by being energized and heated. Corresponding to this, on the inner surface of the front plate 3, anode conductors 5 formed of an Al thin film or the like and formed in a translucent pattern are formed in a stripe shape, and a phosphor layer of a desired emission color is formed on the inner surface thereof. 6 is adhered and formed. On the inner surface of the front plate 3, a light-shielding insulating layer 7 is provided between the phosphor layers 6.

Reference numeral 8 is a control electrode, and a lead wire 8a is provided at one end.
It is composed of a linear electrode having a lead wire and is supported by the sealed portion of the envelope in a state where the lead wires 8a are led out in a left-right staggered manner. The control electrode 8 is supported by a spacer 11 fixed to the front plate 3 via a fixing material 10,
The front plate 3 is stretched through the spacers 11.
Is maintained at a predetermined height.

In this way, if a drive signal is simultaneously applied to the two control electrodes 8 and scanning is sequentially performed, and a display signal is applied to the anode conductor 5, electrons will strike the phosphor layer 6 at the intersection. This is to obtain a desired light emitting display. The light emitting display is observed through the front plate 3.

In addition, the control electrode 8 is formed by pressing or etching a single metal plate, has a lead wire 8a at one end, and leaves a metal plate in a frame shape at both ends. The control electrode is treated as one member. And the control electrode 8 is
After positioning with respect to the front plate 3 in the process of sealing the envelope, the front plate 3 and the side plate 2 are fixed by the sealing material 4. After that, the control electrode 8 is formed by separating the frame.

By the way, in the above-mentioned fluorescent display tube, as shown in FIG.
As shown in, even if the positions of the anode conductor 5 and the phosphor layer 6 and the control electrode 8 are slightly deviated in the arrangement direction of the phosphor layer 6, the display is hardly affected. However, if the intersection angle between the control electrode 8 and the phosphor layer 6 deviates from 90 degrees, the pixel shape becomes distorted, and the display is distorted.

Therefore, the shape of the lead wire 8a of the control electrode 8 and the body of the control electrode 8 are different from each other, and the boundary portion is matched with the arrangement pattern of the fixing material 10 of the spacer 11 so that the control electrode 8 and the fluorescent substance are formed. It was aligned with layer 6.

[Problems to be solved by the device]

However, the fixing material 10 is formed by screen printing or the like and is used for fixing the spacer 11, and a film thickness of 0.1 mm to 0.2 mm is required to obtain sufficient fixing strength. Become. Further, in order to simplify the process, the fixing material 10 may be formed of the same low melting point frit glass as the sealing material 4, and may be simultaneously formed by screen printing. At this time, the sealing material 4 of the envelope is further thickened in order to increase the sealing strength, and at the same time, the thickness of the fixing material 10 is also thickened.

As described above, when the thickness of the fixing material 10 is large, when the fixing material 10 is formed on the front plate 3, sagging is large and the shape is not uniform. Even if the control electrodes 8 are aligned, there is a problem that accurate alignment cannot be performed.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a fluorescent display tube capable of accurately aligning a control electrode with respect to a display portion such as a phosphor layer on a front plate and an anode conductor. To aim.

[0016]

According to the structure of the present invention, electrons emitted from the cathode are selected and controlled by a linear control electrode in an airtight envelope, and are selectively applied to a phosphor layer of a display section. In a fluorescent display tube that is bombarded to obtain a desired light-emitting display, the control electrode is formed integrally with a lead wire that conducts electricity to the control electrode, the size being different from that of the lead wire. An opening is provided so as to be orthogonal to the electrode, and the control electrode is fixed at a position where the boundary between the control electrode and the lead wire is aligned with the open end of the insulating layer.

As another configuration, the display portion is composed of a striped anode conductor formed on a glass substrate, a phosphor layer formed on the upper surface thereof, and an insulating layer formed between the phosphor layers. The control electrode is arranged so as to be stretched in a direction orthogonal to the direction in which the phosphor layer is arranged, and the metal film is exposed in the open portion of the insulating layer.

[0018]

The insulating layer of the display portion has a small film thickness, and the open end portion of the insulating layer has less sagging and has a uniform shape. Further, if the metal film is formed so as to be exposed in the open part of the insulating layer, the boundary of the open end part becomes clear.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings.
1A and 1B show an embodiment of the present invention, in which FIG. 1A is a plan view of a main part thereof, and FIG. 1B is a side view of the main part.
Since the basic structure is similar to that of the conventional fluorescent display tube, the same parts are designated by the same reference numerals and the description thereof will be omitted.

FIGS. 1 (a) and 1 (b) show an example in the middle of manufacturing a fluorescent display tube. Finally, a front plate 3 is formed by integrating a back plate and side plates (not shown) into one body. It is attached via a sealing material to form an envelope. On the inner surface of the front plate 3, an anode conductor 5 made of an Al thin film or the like and formed in a translucent pattern is formed in a stripe shape,
Furthermore, a phosphor layer 6 of a desired emission color is formed on the inner surface of the anode conductor 5.
It is formed in a stripe shape or a dot shape.

On the other hand, the anode conductor 5 is formed on the inner surface of the front plate 3.
In addition, a light-shielding insulating layer 17 is provided between the phosphor layers 6. A metal film 18 is simultaneously formed on the inner surface of the front plate 3 when the anode conductor 5 is formed. The metal film 18 is provided so as to extend in the same direction as the anode conductor 5. Further, the insulating layer 17 is provided with an open portion 17a parallel to the anode conductor 5 on the metal film 18 and forms an open end portion 17b. In addition, the spacer 11 is attached to the inner surface of the front plate 3 on the insulating layer 17 via the fixing material 10.

[0022] The control electrode 8, together with the lead wire portion 8a is provided on the left and right alternately, both end portions are connected by a frame 8b. Further, the control electrode 8 is the lead wire portion 8
The boundary between a and the control electrode 8 main body is aligned with the open end 17b of the insulating layer 17. In this state, a side plate and a back plate, which are not shown, are integrated in advance, and are attached to the front plate 3 via the sealing material 4, and the control electrode 8 is fixed to this sealed portion. Then, the frame 8b is cut to form the control electrode 8.

As described above, in the fluorescent display tube shown in the embodiment, the control electrode 8 is aligned with the open end portion 1 of the insulating layer 17.
This is done using 7b. The insulating layer 17 has both light-shielding properties and insulation, and may have a thickness of several microns. Therefore, if the control electrode 8 is positioned using the open end portion 17b, the positioning can be accurately performed.

Further, when the control electrode 8 is aligned, since the metal film 18 is exposed in the open portion 17a, the open end 17b of the insulating layer 17 becomes clearer and the alignment can be performed easily. it can. Although the example using the metal film 18 is shown in the previous embodiment, the alignment can be performed sufficiently accurately without the metal film. Further, the shape of the open portion can be variously changed as long as the open end is parallel to the anode conductor and the end of the insulating layer is simply the open end.
Further, in the embodiment, an example of using a translucent anode conductor and observing the luminescent display from the front plate side is shown, but it is also applicable to a fluorescent display tube of the type observing the luminescent display from the rear plate side. .

[0025]

As described above, according to the present invention, an open end is provided in the light-shielding insulating layer formed in the display, and the open end is aligned with the boundary between the control electrode and its lead wire to control the display. The electrodes are positioned. Since the insulating layer is intended for light shielding and insulation, it has a thin film thickness and therefore has a uniform shape with little sagging. Therefore, if an insulating layer is used, even a linear control electrode can be accurately aligned.

[Brief description of drawings]

FIG. 1A is a plan view of an essential part showing an example of a fluorescent display tube of the present invention, and FIG. 1B is a side view of the essential part.

FIG. 2 is a side sectional view showing an example of a conventional fluorescent display tube.

FIG. 3 is a plan view of a main part of a conventional fluorescent display tube.

[Explanation of symbols]

 3 Front plate 5 Anode conductor 6 Phosphor layer 8 Control electrode 8a Lead wire 17 Insulating layer 17a Open part 17b Open end part 18 Metal film

Claims (2)

[Scope of utility model registration request] 1. An electron emission emitted from a cathode is selected and controlled by a linear control electrode in an airtight envelope, and selectively emitted to a phosphor layer of a display section to obtain a desired light emitting display. In the fluorescent display tube, the control electrode has a size different from that of a lead wire for energizing the control electrode and is integrally formed, and an opening is provided in an insulating layer formed on the display unit so as to be orthogonal to the control electrode. The fluorescent display tube is characterized in that the control electrode is fixed at a position where a boundary between the control electrode and the lead wire is aligned with an open end of the insulating layer. 2. The display section comprises a stripe-shaped anode conductor formed on a glass substrate, a phosphor layer formed on the upper surface of the anode conductor, and an insulating layer formed between the phosphor layers. The electrode is stretched in a direction orthogonal to the direction in which the phosphor layer is arranged, and the metal film is formed so as to be exposed in the open portion of the insulating layer. The fluorescent display tube described.