JP2821142B2 - Fluorescent display tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fluorescent display tube that displays numbers, symbols, patterns, and the like by emitting light from a phosphor.

[Conventional technology]

Conventionally, as shown in FIG. 3, a fluorescent display tube has a power supply wiring 2 formed of Al or Ag on an insulating substrate 1 and an insulating layer 3 made of a low-melting glass having a through hole and a coloring pigment formed thereon. A graphite layer mainly composed of graphite powder and water glass is formed as a graphite electrode layer 4 at a position corresponding to the through hole, and a ZnO: Zn-based phosphor or (Zn, C) is further formed on the graphite electrode layer 4.
d) Phosphor layers 51 and 52 made of S: Ag, Cl-based phosphor are formed as anode substrates, and grids 6 are arranged at positions corresponding to the phosphor layers 51 and 52 at an appropriate distance. A filament 7 is disposed at an appropriate distance from the grid 6, and a cover glass 8 coated with a light-transmitting conductive film on the inner surface is sealed to the anode substrate to form a vacuum-tight container. Is provided.

In addition, due to the necessity of high-density power supply wiring and the demand for cost reduction accompanying the display complexity in recent years, as shown in FIG.
The power supply wiring 2 and the Al electrode layer 41 as a base of the phosphor layer are collectively formed on the insulating substrate 1 with an Al sputtered film, and then at least the surface of the Al electrode layer 41 where the phosphor layer is to be formed is formed. Then, an insulating layer 3 is provided, and a phosphor layer made of ZnO: Zn-based phosphor or (Zn, Cd) S: Ag, Cl-based phosphor is provided on the Al electrode layer 41.
51 and 52 are formed and used as an anode substrate, or as shown in FIG. 4 to improve the visibility of the display as shown in FIG.
A stripe-shaped light-transmitting window is provided in an electrode layer made of an Al sputtered film, and this is used as an electrode layer 42 having a stripe light-transmitting window. Phosphor layers 51 and 52 are provided on this electrode layer 42 to reduce the emission of phosphor. In addition, as shown in FIG. 6, the power supply wiring 2 shown in FIG. 4 is replaced with an Al electrode layer 41 by an Al sputtered film. A transparent conductive film electrode layer 43 formed of an ITO film, which is a transparent conductive film, is also provided which has a structure in which a display made of phosphor is observed from the back surface of the anode substrate.

[Problems to be solved by the invention]

In each of the above-described conventional fluorescent display tubes, as shown in FIG. 7, one power supply wiring 2 is disposed on an electrode layer forming one display pattern, and a fluorescent light having one emission color is provided on the electrode layer 4. Due to the structure in which the phosphor layer composed of the body was formed, when driven, it was possible to display only one emission color of the phosphor. For example, if a conventional fluorescent display tube is used for a car speedometer,
Even if a display consisting of a green luminescent color is requested up to 100 km / h, and a display consisting of a red luminescent color is required above 100 km / h,
There is a drawback that it is physically impossible to arbitrarily emit two emission colors of green and red with the same one display pattern.

In order to eliminate the above-mentioned problem, a phosphor layer is formed of a mixture of two kinds of phosphors having different emission colors and different emission voltage dependencies (that is, different emission start voltages). Attempts have been made to change the luminescent color by changing the voltage.However, the luminescence starting voltages of the phosphors that can be used for fluorescent display tubes are not so far apart that the operating voltage can be suppressed and those that can be used practically There was a disadvantage that it was not.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fluorescent display tube that can easily change the emission color with the same display pattern.

[Means for solving the problem]

The present invention provides a fluorescent display tube in which a power supply wiring and an electrode layer are formed on an insulating substrate, and a phosphor layer coated and formed in a predetermined display pattern on the electrode layer emits light by electron impact from a filament to obtain a display. One electrode layer forming one display pattern is divided into multiple stripe electrodes, and two peripheral electrodes in which stripe electrodes are alternately connected are provided so as to surround the multiple divided stripe electrodes. An electrode layer is formed by combining a striped electrode and an outer peripheral electrode with each other, an independent power supply wiring is provided for each of the two electrode layers, and a phosphor layer having a different emission color is applied to each of the two electrode layers. It has a formed structure.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partial plan view of a display pattern of a fluorescent display tube according to an embodiment of the present invention, and FIG. 2 is a partial cross-sectional view of the fluorescent display tube according to the embodiment of the present invention.

In the first embodiment, as shown in FIG. 2, first, an Al sputtered film is formed on an insulating substrate 1 made of soda lime glass, and the power supply wirings 21 and 2 are formed by photolithography.
2 and the electrode layers 45 and 46 serving as the base of the phosphor layer were formed at one time. As shown in FIG. 1, the electrode layers 45 and 46 and the power supply wirings 21 and 22 have a single display pattern (here, The electrode layer forming each segment of the character is divided into two stripes each having a line width of 0.1 mm and a line interval of 0.1 mm, and independent power supply wirings 21 and 22 are provided for each of them.

Next, except for the surfaces of the electrode layers 45 and 46 that form the phosphor layers, the insulating layer 3 made of low-melting glass and a coloring pigment is applied and formed, and further on one surface of the two divided electrode layers 45 and 46. ZnO: Z
A phosphor layer (1) 51 for emitting green light composed of an n-based phosphor and a phosphor layer (2) 52 for emitting red light composed of (Zn, Cd) S: Ag, Cl-based phosphor on another surface are provided. It was formed by photolithography. A grid 6 and a filament 7 were arranged on the anode substrate thus obtained, sealed with a cover glass 8, and then vacuum-sealed to produce a fluorescent display tube.

This fluorescent display tube is composed of two stripe-shaped electrode layers a, b45, 46 on which phosphor layers (1), (2) 51, 52 having different emission colors are formed. Since the power supply wirings a, b21, 22 are provided independently for each of the electrode layers a, b45, 46, the display color can be easily changed to green only or red by selecting the power supply wirings a, b21, 22 to be energized at the time of driving. Only, it became possible to change to three types, mixing green and red.

Next, as a second embodiment, the above-described first embodiment will be described.
Power supply wirings a, b21, 22 and electrode layers a, b4 made of Al sputtered film
Instead of 5 and 46, the power supply wirings a, b21 and 22 and the electrode layers a, b45 and 46 were formed by an ITO deposited film. The electrode layers a, b45, 46 also have a line width of 0.
It was divided into two in a stripe shape with 1 mm and a line interval of 0.1 mm, and independent power supply wirings a, b 21, and 22 were provided for each of them. After this,
The insulating layer 3 is formed in the same manner as in the first embodiment, and one of the two divided electrode layers a, b45, 46 is a phosphor layer (1) which emits green light of ZnO: Zn-based phosphor. ) 51, and on the other electrode layer, a phosphor layer (2) 52 of (Zn, Cd) S: Ag, Cl-based phosphor which emits red light was formed. As in the first embodiment, there are three types of fluorescent display tubes of the type in which the display is observed from the back surface of the substrate manufactured using the anode substrate obtained in this manner: green only, red only, and a mixture of green and red. Could be displayed.

Further, in the above-described embodiment, one electrode layer constituting one display pattern is divided into two stripes, independent power supply wirings are provided for each of the two, and each of the two divided electrode layers has a different fluorescent color. Although the case where the body layer was formed was described,
The method of dividing one electrode layer constituting one display pattern into stripes is not limited to the above-described two divisions, and it is possible to provide an independent power supply wiring without losing the shape as one display pattern. as much as possible,
It can be divided into many parts.

〔The invention's effect〕

As described above, the present invention forms one electrode layer serving as a base of a phosphor layer constituting one display pattern of a fluorescent display tube by dividing into multiple stripes, and providing an independent power supply wiring for each of them. By forming light-emitting layers having different light-emitting colors on the multi-divided electrode layers, it is possible to easily change the light-emitting color of display by a simple operation of selecting a power supply wiring to be energized. There is an effect that a fluorescent display tube having a completely new function can be provided.

[Brief description of the drawings]

FIG. 1 is a partial plan view of a display pattern of a fluorescent display tube according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional view of the fluorescent display tube according to the embodiment of the present invention, FIG. 3, FIG. FIG. 6 is a partial sectional view of a conventional fluorescent display tube, and FIG. 7 is a partial plan view of an example of a display pattern of the conventional fluorescent display tube. 1 ... insulating substrate, 2 ... power supply wiring, 3 ... insulating layer, 4 ...
... graphite electrode layer, 6 ... grid, 7 ... filament, 8 ... cover glass, 21 ... power supply wiring a, 22 ...
Power supply wiring b, 41 ... Al electrode layer, 42 ... Electrode layer having stripe-shaped light-transmitting window, 43 ... Transparent conductive film electrode layer, 45 ... Electrode layer a, 46 ... Electrode layer b, 51 ... Phosphor layer (1), 52 ...
... Phosphor layer (2).

Claims (1)

(57) [Claims] 1. A fluorescent display tube in which a power supply wiring and an electrode layer are formed on an insulating substrate, and a phosphor layer coated and formed in a predetermined display pattern on the electrode layer emits light by electron impact from a filament to obtain a display. One electrode layer constituting one display pattern is divided into multiple stripe-shaped electrodes, and two peripheral electrodes in which stripe-shaped electrodes are alternately connected are provided so as to surround the multi-divided stripe-shaped electrodes. An electrode layer is formed by combining the stripe-shaped electrode and the outer electrode with each other, an independent power supply wiring is provided for each of the two electrode layers, and a phosphor layer having a different emission color is provided on each of the two electrode layers. A fluorescent display tube having a structure formed by coating.