JPS5916247A - Fluorescent display tube - Google Patents

Abstract

PURPOSE:To provide an excellent fluorescent display tube with exceedingly high brightness and low power consumption by alternately arranging an anode and a control electrode on the same plane of a substrate and making the control electrode have a luminous function. CONSTITUTION:If positive potential is applied to the cathode A of an arbitrary segment 3 in each display body 2 for cathode potential, when positive potential is applied to a control electrode G in the display body 2 of a selected column, both electrodes A and G emit light. On the other hand, when negative potential is applied to the control electrode G that is adjacent to the anode A to which positive potential is applied for cathode potential, a positive field on the anode A is offset by a negative field made by the control electrode G and an electron that strickes at the anode A from a cathode 5 is cut off. As a result, the emission of the anode A is interrupted. On the contrary, if negative potential is applied to the anode A, even when positive potential is applied to the control electrode G, the electron is cut off by the field made by the anode A and does not strike at the control electrode G.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluorescent display tube comprising a cathode, an anode and a control electrode arranged opposite to the cathode, and particularly, the anode and the control electrode are insulated on the same plane of a substrate. The present invention relates to a fluorescent display tube in which phosphor layers are deposited on both electrodes, which are arranged alternately with a space between them.

Conventionally, a fluorescent display tube consists of an anode formed into a desired letter/figure shape and coated with phosphor on its surface, a filament-shaped cathode placed opposite to the anode, and an intervening space between the two. A control electrode in the form of a grid is sealed in a transparent vacuum container, and electrons emitted from the cathode are selectively made to impinge on a desired anode to display desired characters, figures, etc. was widely used.

However, in the fluorescent display tube based on the above-mentioned conventional technology, since a grid-shaped control electrode exists between the cathode and anode, the control electrode becomes a layer that blocks the field of view when observing the display from the cathode side. There was a drawback that the overall substantial brightness was significantly reduced and it was difficult to see. In addition, since the current flowing into the control electrode is a reactive current that does not contribute to light emission at all, there is also the disadvantage that the utilization efficiency of gravity is low, leading to an increase in power consumption.

Therefore, a planar electrode in which the control electrode and the anode are disposed on the same plane has been put into practical use to eliminate the drawbacks and make the display easier to see. As the manufacturing of microelectrodes has become easier due to rapid advances in semiconductor manufacturing technology, an electrode structure in which an anode and a control electrode are interleaved alternately has been developed in order to improve the electron acceleration and control effect of the control electrode. Now I can think.

An object of the present invention is to take into account the problems of blocking the field of view and power consumption due to the structural limitations of the fluorescent display tube based on the prior art, and to control the The idea is to give the electrode itself a light-emitting function.
It is an object of the present invention to provide an excellent fluorescent display tube that has extremely high brightness and low power consumption by eliminating the above-mentioned drawbacks.

In accordance with the above object, the configuration of the present invention is such that the diffusion, acceleration, and control of electrons by the control electrode are performed in the same plane as the plane on which the anode is arranged, so that when observing the emitting anode, the control electrode do not obstruct the field of view, and in addition,
A fluorescent layer is also deposited on the surface of the control electrode facing the cathode in the same manner as on the surface of the anode to enable light emission.
Together with the light emission from the anode, the overall brightness is significantly improved,
Furthermore, the control electrodes are arranged alternately with the anodes and intercalated with each other so that the electric field from the non-emitting anode acts in a blocking manner on the portion of the control electrode adjacent to the anode. Second, the main feature is to prevent electrons from flowing into the portion of the control electrode, thereby reducing power consumption.

Next, embodiments of the present invention will be described below based on the drawings.

In FIG. 1, a plurality of display bodies 2 are formed on a substrate 1 made of glass fiber or the like, and each display body is made up of a plurality of segments 3.

Above the display body 2, as shown in FIG. 2, segments 3u, a segment 3a, b segment 3b, .
It consists of segments 3g, and furthermore, within each segment 3, anodes A and control electrodes G are arranged on the substrate 1 in a comb-teeth pattern. As clearly shown in FIG. 3, anodes A and control electrodes G are alternately arranged on the substrate 1 with an insulating space S between them, and the electrodes A,
On the surface of G facing the cathode 5, a phosphor layer 8 is deposited. The width and spacing of both electrodes A1G are as follows:
From the viewpoint of ensuring the cut-off effect and the display connection 9, it is preferable that the electrode be small, and a satisfactory electrode can be obtained by applying a thin film forming technique used in semiconductor manufacturing techniques, for example.

Form the display contour as shown in . Although the insulating layer 9 is not made of a complete insulating material, it is preferable that the insulating layer 9 has some conductivity, for example, by mixing a small amount of metal fine powder into glass powder. When electrons from the insulating layer 9 adhere to the insulating layer 9, the electrons are released, effectively preventing the insulating layer from being charged, and thereby eliminating any adverse effects on the electron inflow path to the electrode.

As shown in FIG. 4, the anode A in each display body 2 is connected to an external terminal independently for each segment 3, and the anode AI of the a segment 3a is connected to the first segment signal line 10a. , b segment) 3b is connected to the second segment signal ftM10b, ..., g segment 3g's anode At is connected to the seventh segment signal line 10
each connected to g, each display body 21%
22,...,2. same segment through 3
are connected to the same segment signal line 10. on the other hand,
Within the display body 2, the control electrode G is commonly connected through each segment 3, and each display body 21% 22
% ......, control electrode G in 2, ,G2,
......, Gm is each grid signal line "1s"
11! ,...,11. is connected to. Such a connection is a connection structure for dynamic driving in a multi-digit fluorescent display tube.

In the above configuration, when a positive potential is applied to the anode A of any segment 3 in each display body 2 with respect to the cathode potential, a positive potential is applied to the control electrode G in the display body 2 of the selected digit. Then, both electrodes A and G emit light. On the other hand, when a negative potential with respect to the cathode potential is applied to the control electrode G adjacent to the anode A to which a positive potential has been applied, the positive electric field on the anode A is canceled by the negative electric field created by the control electrode G. Since electrons that are about to hit the anode A from the cathode 5 are cut off, the anode A is prevented from emitting light.

On the other hand, even if control electrode G is given - position, anode A
If a negative potential is applied to the anode A, similarly to the above, the anode A
Since the electrons are cut off by the negative electric field created by the electrode G and do not collide with the control electrode G, the control electrode G will not emit light and no electrons will flow into that part of the electrode G.

That is, only when a positive potential is applied to both the anode A and the control electrode G, the anode A emits light and the control electrode G itself emits light at the same time.

As described above, according to the present invention, in a fluorescent display tube in which a filament-shaped cathode, an anode, and a control electrode are arranged facing each other, the control electrode is arranged adjacent to the anode on the same plane. The control electrode, which has traditionally been a hindrance to observation, no longer obstructs the field of view, and has the excellent effect of increasing apparent brightness.

Moreover, anode and control! Since the electrodes are arranged in a fine-toothed arrangement, the two electrodes are very close to each other, making it easy to cut off the anode and requiring only a small blocking voltage to be applied to the control electrode. If the anode and the control electrode are simply arranged on the same plane of the substrate, the bright voltage will be extremely high, and it is generally difficult to realize dynamic drive. The above-mentioned effect derived from the arranged arrangement ensures the realization of dynamic drive for the first time.

In addition, since the phosphor layer is also deposited on the control electrode disposed between the anode and the anode, the control electrode itself also has a light emitting function, so the light emission in conjunction with the light emission from the anode is achieved. This significantly improves the overall brightness, and since the electrons flowing into the control electrodes in the light-emitting segments are also converted into light, there is no reactive current and the power utilization rate is improved.

Furthermore, since the control electrode inserted between the anodes also emits light together with the anodes, there is also the effect that a finely interconnected display can be obtained.

Moreover, the portion of the control electrode adjacent to the anode in the segment that is not emitting light is not bombarded with electrons from the cathode and no electrons flow into the control electrode, thereby reducing power consumption. Not only that, but it also has the effect of reducing cathode consumption and extending its lifespan.

[Brief explanation of drawings]

The figures show an embodiment of the invention, and Figure 1 is an overall perspective view;
FIG. 2 is an enlarged view of the display body, FIG. 3 is a sectional view taken along line XX in FIG. 2, and FIG. 4 is an explanatory diagram of the connections of each display body. 1... Board 2... Display body 3.
... Segment A ... Anode G ...
... Control electrode 5 ... Cathode 8 ... Phosphor layer S ... Insulating space 9 ... Insulating layer 10 ... Segment signal line 11...
...Grid signal line Figure 1 8"\-"(d

Claims (2)

[Claims] (1) It has a display body consisting of a plurality of segments, each segment consisting of an anode and a control electrode arranged alternately on the same plane of the substrate with an insulating space between them, and facing the cathode of both electrodes. A fluorescent display tube characterized in that a phosphor layer is deposited on the surface of the fluorescent display tube. (2) The anode is connected to an external terminal independently for each segment within each display body, while the control electrode is commonly connected to an external terminal within each display body.
Fluorescent display tube as described in section.