JP2002008570A - Fluorescent display tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a variously designed display by raising the brightness of a data display higher than that of a display equivalent to the background. SOLUTION: A thin film anode electrode 8 of transparent conductive film is formed at inner surface of the first substrate 3. On an anode electrode 8, a thin phosphor layer 9 formed in a shape of display pattern equivalent to the background and the first luminous display part A with a prescribed opening, are formed. At inner surface of the second substrate facing the first substrate 3, the second luminous display part B, having a phosphor layer 15 formed in the shape of various data display pattern on an anode electrode 14, is formed. A control electrode 16 is arranged with a subscribed distance from the thin phosphor layer 9, and a cathode 17 is arranged with a subscribed distance from the control electrode 16. When operated, the first luminous display part A performs the display equivalent to the background, and the second luminous display part B performs the display of various data, and those displays are observed at the outside of the first substrate 3. The data display of the second luminous display part B is observed at the outside of the first substrate 3 through the opening of the first luminous display part A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display tube for performing a desired display by causing a phosphor to emit light by colliding thermoelectrons, and more particularly, to a fluorescent display tube having a vacuum-contained envelope. The present invention relates to a novel double-sided fluorescent display tube that displays data such as characters, symbols, bar graphs, and the like on the inner surface and displays a background equivalent on the inner surface of the other substrate.

[0002]

2. Description of the Related Art A double-sided fluorescent display tube having a light-emitting display portion provided on each inner surface of a facing substrate constituting a box-shaped envelope whose inside is vacuum-maintained is provided on one substrate of the envelope. Display characters, symbols, bar graphs and other data on the inside,
There is known a type in which a background is displayed on the inner surface of the other substrate and these displays are observed from the one substrate side.

FIG. 3 is a side sectional view showing an example of this type of conventional double-sided fluorescent display tube.

A double-sided fluorescent display tube 31 shown in FIG.
It has a box-shaped envelope 32 whose inside is held in vacuum.
The envelope 32 is configured by assembling a first substrate 33, a second substrate 34, and a frame-shaped side plate 35, each of which is made of a plate material such as glass having translucency and insulating properties.

An anode electrode 36 made of a transparent conductive film such as ITO (Indium Tin Oxide) and anode wiring (not shown) are formed in a predetermined pattern on the inner surface of the first substrate 33 on the side where the display is observed. I have. A phosphor layer 37 is formed on the anode electrode 36 in a data display pattern shape, and constitutes a light emitting display section 38 for displaying data. Below the light-emitting display section 38, mesh-shaped control electrodes 39 are provided at predetermined intervals. Below the control electrode 39, a filament-like cathode 40 is stretched and disposed at a predetermined interval.

On the inner surface of the second substrate 34, a solid anode electrode 41 made of, for example, an Al thin film and anode wiring (not shown) are formed. On the anode electrode 41, a phosphor layer 42 is formed in the shape of a background pattern, and constitutes a light emitting display section 43 for performing background display.

In the double-sided light emitting fluorescent display tube 31 configured as described above, desired data such as characters, symbols, bar graphs, etc. are displayed on the light emitting display section 38 of the first substrate 33.
Background display is performed on the light emitting display section 43 of the second substrate 34. The data display and the background display are the first
It is observed from the outside of the substrate 33.

[0008]

Meanwhile, in the fluorescent display tube, the thermoelectrons emitted from the cathode are accelerated and controlled by the control electrode, and the thermoelectrons collide with the surface of the phosphor layer on the selected anode electrode. Although it emits light, in the above-mentioned conventional double-sided fluorescent display tube 31, both data display and background display are observed from outside the first substrate 33 having the light-emitting display unit 38 for performing data display. For data display, light emission on the surface of the phosphor layer 37 is observed through the first substrate 33, the anode electrode 36, and the phosphor layer 37. On the other hand, regarding the background display, the first
Light emission on the surface of the phosphor layer 42 is directly viewed through the substrate 33.

For this reason, there is a problem that the luminance of the background display is higher than that of the data display which originally requires the luminance, and the visibility of the data display is impaired.

In addition, with the recent development of industry, fluorescent display tubes used as display panels for various products such as car audio systems and system components also have new designs and display variations from the user side that have not existed before. Is required.

In view of the above, the present invention has been made in view of the above-mentioned problems, and it is possible to secure the visibility of data display by increasing the brightness of the data display as compared with the display corresponding to the background, and to use various designs. It is an object of the present invention to provide a fluorescent display tube capable of displaying.

[0012]

In order to achieve the above object, according to the first aspect of the present invention, two substrates, one of which is translucent, face each other, the outer peripheral portions of these substrates are sealed, and the inside is sealed. A box-shaped envelope kept in vacuum, a first electrode of a thin film formed on the inner surface of the translucent substrate, and a thin film formed on the first electrode in a display pattern shape corresponding to a background A first light-emitting display portion having a predetermined opening, a second electrode formed on the inner surface of the substrate facing the light-transmitting substrate, and characters on the second electrode. A second light-emitting display section having a phosphor layer formed in a pattern shape for displaying various data such as symbols and bar graphs, and a second light-emitting display section disposed at a predetermined distance from the phosphor layer of the second light-emitting display section. A control electrode; and a cathode disposed at a predetermined distance from the control electrode. Wherein the data display of the second light emitting display unit is observed from the outside of the substrate having the light-transmitting from the opening of the first light-emitting indicator.

According to a second aspect of the present invention, in the fluorescent display tube of the first aspect, the first electrode is formed of a solid transparent electrode,
It is characterized in that a pattern is formed so as to have a predetermined opening in the phosphor film.

According to a third aspect of the present invention, in the fluorescent display tube of the first aspect, the first electrode comprises a transparent electrode or a metal electrode having an equivalent opening.

According to a fourth aspect of the present invention, in the fluorescent display tube according to any one of the first to third aspects, a positive voltage is always applied to the first electrode.

According to a fifth aspect of the present invention, in the fluorescent display tube according to any one of the first to fourth aspects, the thickness of the phosphor film of the first light emitting display section is 1 to 5 μm.

According to a sixth aspect of the present invention, in the fluorescent display tube according to any one of the first to fourth aspects, the phosphor film of the first light-emitting display portion is made of an ultrafine phosphor and has a thickness of 0.1 μm. 1
１1 μm.

According to a seventh aspect of the present invention, in the fluorescent display tube according to the first aspect, the phosphor film is formed in multiple colors, the first electrode is divided for each color of the phosphor film, and another color is used. The phosphor film is formed on the first substrate so as not to cross the electrode on which the phosphor film is formed, and a positive voltage is selectively applied to the first electrode for each color of the phosphor film. And

[0019]

1 is a partially enlarged side sectional view showing an embodiment of a fluorescent display tube according to the present invention. As shown in FIG. 1, the fluorescent display tube 1 of the present embodiment has a box-shaped envelope 2. The envelope 2 is arranged at a predetermined interval with the first substrate 3 and the second substrate 4 facing each other, and a frame-shaped side plate 5 is sealed to the outer peripheral portions of the first substrate 3 and the second substrate 4. It is sealed with a material 6 and the inside is held in vacuum.

The first substrate 3 is made of an insulating and translucent plate material such as glass. On the inner surface of the first substrate 3, an anode wiring 7 and an anode electrode (first electrode) 8 are formed. The anode electrode 8 is formed of any of a solid transparent electrode, a transparent electrode having an equivalent opening, and a metal electrode having an equivalent opening to a thickness of about 0.1 μm. On the anode electrode 8, a phosphor film 9 having a shape corresponding to a display pattern corresponding to a background is formed as a thin film.

The phosphor film 9 is preferably formed by applying and baking phosphor particles as thinly as possible on the anode electrode 8.
In this case, it is desirable that the amount of application is such that the emission pattern of the phosphor layer 15 of the second substrate 4 does not spread, that is, the phosphor particles are one layer and the phosphor particles are separated from each other and have openings. In the phosphor film 9, when the anode electrode 8 is formed of a transparent conductive film such as ITO, if the phosphor particles are too dense, the light emission on the back side of the second substrate 4 is too weak. On the other hand, if the phosphor particles are too far apart, the emission intensity of the phosphor film 9 will be weak. For this reason, the density of the phosphor particles is adjusted according to the application.

FIG. 2 shows the relationship between the thickness of the phosphor film 9 and the luminance. In FIG. 2, the anode electrode on the second substrate 4 side is formed of ITO, and the luminance when no phosphor is present on the ITO is set to 100% (solid line in FIG. 2). As a specific example of this example, the relationship between the thickness of the phosphor film 9 and the luminance when the anode electrode 8 on the second substrate 4 side is formed by a hatching pattern of Al and the aperture ratio is 90% is shown in FIG. 2 when the aperture ratio is 85%.
It shows a characteristic like the one-dot chain line. 2, when the thickness of the phosphor film 9 is the same, the larger the aperture ratio of Al forming the anode electrode 8, the higher the brightness. In addition, when the aperture ratio of Al is the same, it can be seen that the smaller the thickness of the phosphor film 9, the higher the luminance.

The phosphor film 9 is formed by applying a usual phosphor for a fluorescent display tube from above the anode electrode 8 and also forming the following (1)
To (3). As a result, a first light-emitting display unit A that performs display corresponding to the background is configured. (1) A phosphor powder having an average particle diameter of 3 μm or less is dissolved in a solvent, and the gap between the printing squeegee and the first substrate 3 is adjusted to 1 to 5 μm (preferably 1 to 3 μm) by a doctor blade method.
m) The phosphor film 9 is formed on the anode electrode 8. (2) A phosphor powder having an average particle diameter of more than 3 μm is pulverized by a ball mill to have an average particle diameter of 3 μm or less. 1-5μm by doctor blade method
A phosphor film 9 (preferably 1 to 3 μm) is formed on the anode electrode 8. (3) An ITO film is formed as the anode electrode 8 on the first substrate 3 and ZnO: Zn ultrafine particles (0.1
(μm or less) is applied thinly to form the phosphor film 9. Thereby, the film thickness is 0.1 to 0.5 μm (preferably 0.1 to 0.5 μm).
(1 μm) phosphor film 9 is formed.

A specific example of the method of forming the phosphor film 9 is as follows. As a specific example of the above (1), the phosphor powder is made of a fine particle printing squeegee having an average of 3 μm and an average particle size of 1 μm or less.
The gap of the substrate 3 is 1 μm or less, which is
wt%, UV curing agent 40-50wt%, solvent 10wt
% Is mixed and formed into a film by a doctor blade method or the like and fired at 520 ° C. Thus, a translucent phosphor film 9 having a thickness of 1 to 3 μm is formed on the anode electrode 8. Further, as a specific example of the above (2), a color phosphor having an average of 5 to 7 μm is pulverized by a ball mill to have an average particle diameter of 3 μm or less, and then the phosphor film 9 is formed by the above-described forming method.
Further, as a specific example of the above (3), a transparent glass substrate is used as the first substrate 3, and an IT
An O film is formed, and ZnO: Zn ultrafine particles (0.
(1 μm or less). As a result, a film thickness of 0.1
The phosphor film 9 having a thickness of about 0.5 μm is formed.

The second substrate 4 is made of, for example, the same plate material as glass as the first substrate 3, but only needs to have an insulating property, and does not necessarily have to have a light transmitting property. Second substrate 4
The anode wiring 11 is formed on the inner surface of the anode wiring 11.
An insulating layer 12 having a through hole 12a is formed at a predetermined position. The insulating layer 12 is formed of an opaque material such as graphite.

On the insulating layer 12, an anode electrode 14 is formed so as to be connected to the anode wiring 11 via a conductive material 13 filling the through hole 12a. Anode electrode 14
Is formed of a transparent electrode or a metal electrode, and is formed in a shape (for example, a shape slightly larger than the data display pattern shape) including at least a data display pattern shape such as a character, a symbol, and a bar graph. The phosphor layer 1 is provided on the anode electrode 14.
5 is formed in a pattern shape for displaying data such as characters, symbols, and bar graphs. Thus, the second light emitting display section B for displaying data such as characters, symbols, and bar graphs is configured.

Above the phosphor layer 15, a control electrode 16 having a mesh shape is disposed at a predetermined interval. Below the control electrode 16, filament-shaped cathodes 17 are arranged at predetermined intervals on a cathode support (not shown) fixed to the first substrate 3.

Next, a method of manufacturing the fluorescent display tube 1 having the above configuration will be described.

Process for Producing First Substrate (Front-Side Substrate) 3 An anode wiring 7 and an anode electrode (first electrode) 8 are formed on a first substrate 3 such as glass having an insulating property and a light transmitting property. The anode wiring 7 and the anode electrode 8 are made of a transparent conductive film such as ITO or Al.
And the like, for example, to a thickness of about 0.1 μm. When the anode electrode 8 is formed of a metal thin film, it is formed in a pattern shape having a predetermined opening. For example, it can be formed in a mesh shape, a stripe shape, a dot shape, a mosaic shape, or the like. When the anode electrode 8 is formed of a transparent conductive film, the anode electrode 8 is formed in a pattern shape having a predetermined opening or a solid shape on one surface of the first substrate 3. After that, the phosphor film 9 is formed on the anode electrode 8 by the method described above.

A process for manufacturing the second substrate (base-side substrate) 4 The anode wiring 1 is formed on the second substrate 4 having an insulating property such as glass.
Form one. Subsequently, an opaque insulating layer 12 having a through hole 12a at a predetermined position of the anode wiring 11 is formed.
Then, the conductive material 13 is filled in the through holes 12a of the insulating layer 12, and the anode electrode 14 is formed thereon. afterwards,
The phosphor layer 15 is formed on the anode electrode 14 in a pattern for data display.

In a step different from the above, the filament-shaped cathode 17 is fixed by welding between the pair of cathode supports (anchors, supports) and the cathode supports in the spacer frame having external terminals under a predetermined tension. .

When the spacer frame in which the first substrate 3, the second substrate 4, and the cathode 17 are stretched as described above is manufactured, the spacer frame is aligned on the first substrate 3. Then, a frame-shaped side plate 5 in which four glass plates are bonded and fixed in a frame shape is placed on the spacer frame. Thereafter, the second substrate 4 is positioned and placed on the side plate 5. Then, the aligned first substrate 3, side plate 5, and second substrate 4 are heated and fired at about 450 ° C. in a CO ₂ gas atmosphere while being pressed from above and below using a suitable jig.
Thereby, the substrates 3, 4, and 5 are sealed with each other, and the envelope 2 is assembled. Thereafter, an evacuation process is performed until the inside of the envelope 2 reaches a predetermined vacuum state. Then, an aging process for driving the phosphors of the light emitting display units A and B to emit light for a predetermined time on a trial basis is performed. Thereby, the fluorescent display tube 1 of this example
Is completed.

When the fluorescent display tube 1 is driven, the cathode 17 is heated and driven to emit thermoelectrons in a state where a positive voltage is always applied to the anode electrode 8 of the first substrate 3 to emit data electrons. The anode electrode 14 and the control electrode 16 of the second substrate 4 are selectively driven according to the contents. As a result, a display corresponding to the background is performed on the first light emitting display section A of the first substrate 3 near the display observation side, and various data such as characters, symbols, and bar graphs are displayed on the second light emitting display section B of the second substrate 4. Display is performed, and these displays are observed from outside the first substrate 3.

Therefore, according to the fluorescent display tube 1 of this embodiment, the display corresponding to the background can be displayed thinner than the data display, and various data displays can be clearly emphasized. This ensures the visibility of various data displays,
The entire display area can be shown brilliantly. Moreover,
Since the first light-emitting display section A of the first substrate 3 has an opening at which the second light-emitting display section B of the second substrate 4 located at least on the rear side can be observed, the first light-emitting display section A and the second light-emitting display section A The display can be performed by forming patterns of various shapes on the light-emitting display section B, and a new image display that has not been realized can be realized.

If the thickness of the phosphor film 9 of the first light emitting display section A of the first substrate 3 is 1 to 5 μm, the phosphor film 9 is turned off when the light is turned off.
Depending on the phosphor layer 15 on the back side and the built-in material (control electrode 16).
And the cathode 17) can be shielded.

By the way, in the above-described embodiment,
By using fluorescent materials of various colors (for example, red, green, blue, orange, etc.) for the phosphor film 9, the first light emitting display section A of the first substrate 3 can be displayed in a multicolor display corresponding to the background. It is.
In this case, the anode electrode 8 is divided for each color of the phosphor film 9 formed on the anode electrode 8 and is formed on the first substrate 3 using an insulating layer so as not to cross the anode electrodes 8 of other colors. A pattern is formed so that a positive voltage can be selectively applied to the anode electrode 8 for each color of the phosphor film 9. Thereby, colorful display can be performed and display variations can be increased.

In the fluorescent display tube 1 shown in FIG.
The anode wiring 11 and the anode electrode 14 are formed on the same plane of the second substrate 4.
May be formed, an insulating layer 12 having an opening in a pattern shape for displaying data such as characters, symbols, and bar graphs may be formed from above, and the phosphor layer 15 may be formed from above the opening in the insulating layer 12. .

Further, in the above embodiment, the second substrate 4
Although the configuration using the insulating layer 12 on the side has been described, a configuration in which the insulating layer 12 is omitted may be adopted. In this case, the anode wiring 11 and the anode electrode 14 are formed on the same plane of the second substrate 4, and the anode electrode 14 is formed in a pattern shape for displaying data such as characters, symbols, and bar graphs.

[0039]

As apparent from the above description, the fluorescent display tube of the present invention has the following effects.

The display corresponding to the background is performed on the first light emitting display section of the first substrate, and data such as characters, symbols, bar graphs, etc. are displayed on the second light emitting display section of the second substrate. , The display corresponding to the background can be displayed thinner than the data display, and the data display can be highlighted.

Since the first light-emitting display portion of the first substrate has an opening at least so that the second light-emitting display portion of the second substrate located on the back side can be observed, the first light-emitting display portion A and the second light-emitting display portion are provided. The display can be performed by forming patterns of various shapes on the display section B, and a new image display which has not been available can be realized.

If the thickness of the phosphor film of the first light emitting display section of the first substrate is 1 to 5 μm, the phosphor film on the back side and the internal components (control electrodes, cathodes, etc.) are turned off by the phosphor film when the light is turned off. Can be shielded.

The phosphor film is formed in multiple colors, the first electrode is divided for each color of the phosphor film, and the first electrode is formed on the first substrate so as not to intersect with the electrodes on which phosphor films of other colors are formed. When a positive voltage is selectively applied to the first electrode for each color of the phosphor film, the display corresponding to the background becomes colorful,
Display variations increase.

[Brief description of the drawings]

FIG. 1 is a partially enlarged side sectional view showing an embodiment of a fluorescent display tube according to the present invention.

FIG. 2 is a diagram showing a relationship between the thickness of a phosphor film on a second substrate side and luminance.

FIG. 3 is a partially enlarged side sectional view showing an example of a conventional fluorescent display tube.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fluorescent display tube, 2 ... envelope, 3 ... 1st board, 4 ... 2nd
Substrate, 8: first electrode (anode electrode), 9: phosphor film, 14
... Second electrode (anode electrode), 15: phosphor layer, 16: control electrode, 17: cathode, A: first light emitting display section, B: second light emitting display section.

Claims (7)

[Claims] 1. A box-shaped envelope in which two substrates, one of which is translucent, face each other, the outer peripheral portions of which are sealed, and the inside of which is held in vacuum, First of the thin film formed on the inner surface of the substrate
A first light-emitting display portion having an electrode, a thin phosphor film formed on the first electrode in a display pattern shape corresponding to a background, having a predetermined opening, and facing the light-transmitting substrate. A second electrode formed on the inner surface of the substrate to be formed, and a second light-emitting display portion having a phosphor layer formed on the second electrode in a pattern shape for displaying various data such as characters, symbols, and bar graphs; A control electrode disposed at a predetermined distance from the phosphor layer of the second light emitting display unit; and a cathode disposed at a predetermined distance from the control electrode; A fluorescent display tube, wherein data display is observed from the outside of the translucent substrate through the opening of the first light emitting display unit. 2. The fluorescent display tube according to claim 1, wherein the first electrode is formed of a solid transparent electrode, and is patterned so as to have a predetermined opening in the phosphor film. 3. The fluorescent display tube according to claim 1, wherein said first electrode comprises a transparent electrode or a metal electrode having an equivalent opening. 4. The fluorescent display tube according to claim 1, wherein a positive voltage is constantly applied to said first electrode. 5. The fluorescent display tube according to claim 1, wherein the thickness of the phosphor film of the first light emitting display section is 1 to 5 μm. 6. The method according to claim 1, wherein the phosphor film of the first light-emitting display section is made of ultrafine phosphor, and has a thickness of 0.1 to 1 μm. The fluorescent display tube as described. 7. The phosphor film is formed in multiple colors, the first electrode is divided for each color of the phosphor film, and does not cross an electrode on which a phosphor film of another color is formed. The first
2. The fluorescent display tube according to claim 1, wherein a positive voltage is selectively applied to the first electrode for each color of the phosphor film formed on a substrate.