JPH0631641Y2 - Fluorescent display tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a fluorescent display tube in which a control electrode is arranged in the same plane as a display unit, and more particularly to a control electrode in which electric field control is easy.

[Prior art]

Conventional fluorescent display tubes include a display section having a phosphor layer and an anode conductor in an airtight envelope, a cathode for emitting electrons, and a control electrode having a mesh-shaped opening disposed between the display section and the cathode. It is a structure having. Then, the electrons emitted from the cathode are selected and controlled by the control electrode and the cathode conductor to selectively strike the phosphor layer to obtain a desired light emitting display.

In addition, as described in JP-A-55-56343 as a structure of a fluorescent display tube, a control electrode made of a conductive film is provided on a substrate on which a display section is formed, at a position surrounding the display section. Some were done. In this type of fluorescent display tube, since it is not necessary to provide the mesh-shaped control electrode as described above, the structure thereof can be simplified, and since it can be formed simultaneously in the step of forming the anode conductor of the display portion, Excellent in productivity and manufacturing cost. Further, the control electrode is integrally formed on the substrate directly or through another member such as an insulating layer. Therefore, the control electrode is not thermally deformed at the time of operation, and accordingly, the control electrode is not in contact with the display portion or the cathode, and the malfunction due to the short circuit can be prevented.

On the other hand, as a driving method of the fluorescent display tube, there are a dynamic driving method and a static driving method. In the static drive method, the anode conductor is electrically divided for each display pattern, and a display signal is applied to each anode conductor to perform light emission display, and the control electrode is not necessary to select the display unit. It only diffuses the electrons emitted from the cathode efficiently and prevents the external electric field from affecting the display portion. On the other hand, in the dynamic drive type, for example, the control electrode is divided into several parts, the anode conductor is commonly connected so as to straddle each control electrode, the control electrode is driven in a time division manner, and the timing of the control electrode is controlled. According to the above, a display signal is applied to the anode conductor to obtain a desired light emitting display.

[Problems to be solved by the device]

By the way, in the fluorescent display tube described in Japanese Patent Application Laid-Open No. 55-56343, the control electrode is on substantially the same plane as the display section, so that even if dynamic driving is performed, the electrons emitted from the cathode are not emitted. There is a problem that it is not suitable for dynamic driving because the control electrode cannot completely block the arrival at the phosphor layer, resulting in leakage light emission. Further, when the pattern of the display portion becomes large, there is a problem that the electrons emitted from the cathode cannot be sufficiently diffused and display unevenness occurs.

The present invention has been made in view of the above problems,
An object of the present invention is to provide a fluorescent display tube in which a control electrode is on substantially the same plane as a display section, a driving method of a dynamic drive system can be applied, and display unevenness does not occur even if it has a large display pattern. And

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the structure of the present invention has a display unit having an anode conductor and a phosphor layer, a control electrode arranged in the same plane as the display unit, and emitting electrons in an airtight envelope. In the fluorescent display tube having a cathode, the control electrode has a structure having a large number of openings and is arranged on the surface of the phosphor layer via an insulating layer having the same pattern as the control electrode.

[Action]

As described above, since the control electrode is provided even on the surface of the phosphor layer, it is possible to shield the electron impingement on the phosphor layer even with a shallow cutoff potential. Further, even if the display pattern becomes large, the diffusion of electrons becomes easy, and display unevenness does not occur.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings. Figure 1 shows
FIG. 1 (a) is a diagram showing an example of the fluorescent display tube of the present invention.
Is a plan view thereof, and FIG. 1 (b) is a longitudinal sectional view.

The fluorescent display tube A is an insulating substrate 1 made of a glass plate or the like.
And a translucent front plate 2 made of a glass plate or the like which is opposed to this, and side plates 12a and 12b forming side faces, which are hermetically sealed via a sealing material such as a low melting point frit glass. It constitutes the envelope.

Further, an insulating layer 3 and a conductor 5 such as wiring are formed on the upper surface of the substrate 1 by a screen printing method or the like. Further, an anode conductor 4 such as graphite and a phosphor layer 6 are formed on the upper surface thereof by a screen printing method or the like according to a display pattern. The anode conductor 4 and the phosphor layer 6 form a display section. A control electrode 8 is laminated on the upper surfaces of the phosphor layer 6 and the insulating layer 3 with an insulating layer 7 interposed therebetween. As shown in FIG. 1A, the insulating layer 7 and the control electrode 8 are arranged so as to span a plurality of display portions, and at least a portion corresponding to the display portion has a mesh-shaped or slit-shaped opening. Is.

In addition to this, 9 is a cathode, which is arranged so as to be stretched over the supports 10 and 10. The cathode 9 emits electrons by being electrically heated. In the figure, 11a, 11b, 11c,
Is a lead wire connected to the control electrode 8, the anode conductor 4, and the cathode 9 directly or via the wiring conductor 5, respectively.

The control electrode 8 is arranged so as to extend over some of the display parts that form a set as described above. The anode conductor 4 of the display section is connected to the other control electrode 8 via the wiring conductor 5.
And the anode conductor 4 of the corresponding display section are electrically connected in common.

Next, a method of forming the control electrode 8 and the insulating layer 7 will be described.

As an example of a method of forming the control electrode 8 and the insulating layer 7, a method using transfer printing as shown in FIGS. 2A and 2B is shown. FIG. 2 (a) shows the structure of the transfer film. The transfer film B includes a base film 13 and a release layer.
14, the control electrode 8, the insulating layer 7, and the adhesive layer 15 are sequentially stacked.

Specifically, the base film 13 is composed of a film made of polyethylene, polypropylene, polyester or the like having a thickness of several tens of μm. The peeling layer 14 has a thickness of 1
It is formed by a gravure printing method or a screen printing method using a thermoplastic resin or the like with a thickness of up to 2 μm. In addition, a wax layer is provided between the base film 13 and the release layer 14 in order to enhance the release property.
14 'may be formed. Further, the control electrode 8 is made of graphite Ag, A
A conductive material such as u is formed into a predetermined shape by screen printing or the like and has a large number of openings.
Similarly to the control electrode 8, the insulating layer 7 is also formed of an insulating material such as SiO ₂ or lead glass in a predetermined shape by a screen printing method or the like. In addition, as a method of forming the control electrode 8 and the insulating layer 7, a mask may be used to form the control electrode 8 and the insulating layer 7 once or several times by sputtering.

The adhesive layer 15 is preferably a heat-sensitive and pressure-sensitive adhesive layer having a film thickness of 1 to 2 μm and having good adhesiveness to a glass material.
As a method of forming the adhesive layer 15, a screen printing method, a gravure printing method, or the like may be used.

The control electrode 8 is transferred to the upper surfaces of the insulating layer 3 and the phosphor layer 6 through the insulating layer 7 using the transfer film B having the above-described structure. At the time of transfer, as shown in FIG. 2 (b), the silicon rubber roller 16 or the like is heated to about 200 ° C. while being pressurized to about 50 kg / cm ² , for example, and transferred at a transfer speed of about 5 cm / sec. To do. After that, the base film 13 can be peeled off from the peeling layer 14, and the control electrode 8 can be formed on the phosphor layer 6 and the insulating layer 3 via the insulating layer 7 through a firing process.

As described above, in the fluorescent display tube of the present invention, the control electrode 8 having a large number of openings is arranged not only around the phosphor layer 6 but also on the surface thereof through the insulating layer 7 having the same pattern. Is.

Therefore, since the control electrode 8 is positioned above the phosphor layer 6, the electrons emitted from the cathode 9 can be easily blocked from reaching the phosphor layer 6 by the control electrode 8. Even if a display is performed by dynamic driving with the anode conductor 4, good display can be obtained without leakage light emission or the like.

Further, even if the pattern of the display portion becomes large, the electrons emitted from the cathode can be sufficiently diffused, so that display unevenness or the like does not occur and good display can be obtained. Since the control electrode 8 is integrated with the substrate 1 as a matter of course, the control electrode 8 is not thermally deformed during operation, and accordingly, the control electrode 8 does not come into contact with the display portion or the cathode 9 and is short-circuited. It is possible to prevent malfunction due to

Further, since it is formed by transfer printing using the transfer film B, it can be easily formed even if the display portion such as the phosphor layer 6 has irregularities.

[Other Examples]

As a method of forming the control electrode, a sputtering method or the like can be used, and the control electrode can be directly formed on the display portion A, Ag, Au or the like through an insulating layer such as SiO ₂ with a mask or the like.

Further, when the control electrode is formed by transfer printing, if other members formed on the substrate such as the phosphor layer and the anode conductor are also formed on the transfer film, the manufacturing process can be simplified. .

Besides, in the previous embodiment, an example of a fluorescent display tube of a type in which the display is observed through the front plate facing the substrate in the airtight envelope has been shown, but a fluorescent display of a type in which the display is suitably observed is shown. Of course, it can be applied to tubes.

〔effect〕

As described above, the fluorescent display tube of the present invention comprises a display part having an anode conductor and a phosphor layer in an airtight envelope, a control electrode arranged on the same plane as the display part, and a cathode for emitting electrons. In the fluorescent display tube having, the control electrode has a large number of openings and is disposed on the surface of the phosphor layer via an insulating layer having the same pattern as the control electrode.

Therefore, since the control electrode is arranged not only around the phosphor layer but also on the upper portion, electrons emitted from the cathode can be easily blocked by the control electrode from reaching the phosphor layer, and Even if display is performed by dynamic driving with the cathode conductor, good display can be obtained without causing leakage light emission or the like. Further, even if the pattern of the display section becomes large, the electrons emitted from the cathode can be sufficiently diffused, so that display unevenness or the like does not occur and good display can be obtained.

[Brief description of drawings]

1 (a) and 1 (b) are a plan view and a longitudinal side sectional view showing a fluorescent display tube of the present invention, and FIGS. 2 (a) and 2 (b) are fluorescent display tubes of the present invention. It is a figure showing an example of forming the electrode. A ... Fluorescent display tube 1 ... Substrate, 3 ... Insulating layer 4 ... Anode conductor, 5 ... Wiring conductor 6 ... Phosphor layer, 7 ... Insulating layer 8 ... Control electrode

Claims (1)

[Scope of utility model registration request] 1. A fluorescent display tube having, in an airtight envelope, a display section having an anode conductor and a phosphor layer, a control electrode arranged on the same plane as the display section, and a cathode for emitting electrons. 2. The fluorescent display tube according to claim 1, wherein the control electrode has a structure having a large number of openings and is arranged on the surface of the phosphor layer via an insulating layer having the same pattern as the control electrode.