JP2519270Y2 - 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, figures and the like, and more particularly to a fluorescent display tube for observing a luminescent display through a substrate on which a display section is formed.

[0002]

2. Description of the Related Art Conventionally, in a fluorescent display tube, a filter is used for the purpose of improving the contrast of display by cutting off external light or light reflected internally, or for improving the color purity of the light emitted from the display section. Is used. Further, a filter is used for the purpose of extracting only a specific wavelength out of the emission wavelength from the display section and changing the apparent emission color from the display section.

As a type of filter, there is a filter in which an acrylic resin plate or the like is positioned in front of the fluorescent display tube, or a colored layer is directly provided on the outer surface or the inner surface of the substrate of the fluorescent display tube.

FIG. 3 shows a side cross section of a fluorescent display tube. The fluorescent display tube A includes a substrate 1 made of a glass plate or the like having a light-transmitting property and an insulating property, and a side plate 2 forming a side surface portion.
The rear plate 3 positioned corresponding to the substrate 1 is integrally formed with the sealing material 4 made of low melting point glass or the like, and has an airtight envelope.

Further, on the inner surface of the substrate, a colored layer 6 as a filter, a transparent anode conductor 7 formed by forming a transparent conductive film or an Al thin film in a stripe shape, and a phosphor layer 8 are sequentially laminated. And a display portion B is formed. On the inner surface of the substrate 1, an insulating layer 5 having a light blocking property is provided between the display portions B.

Next, the display section B will be described in detail. As described above, the display portion B is provided by sequentially stacking the colored layer 6, the anode conductor 7, and the phosphor layer 8 on the substrate 1. Colored glass is generally used as the coloring layer 6, and a mixture of a pigment and glass powder is coated with an organic solvent.
It is formed by forming a strike, depositing it in a predetermined pattern on the substrate 1 by screen printing or the like, and baking it.

Then, a transparent conductive film such as ITO is formed in a predetermined pattern on its inner surface to form the anode conductor 7. As the anode conductor 7, via the subsequent Fuotoriso step by depositing A1 like, some of which have a predetermined pattern formed. In this case, the anode conductor 7 has a mesh-shaped or stripe-shaped opening so as to have translucency.
Then, a phosphor layer 8 is formed by depositing a phosphor on the thus formed anode conductor 7 by screen printing or the like and then baking the phosphor.

In addition, inside the fluorescent display tube A, a control electrode 9 and a linear cathode 10 are provided at positions facing the display section B.
Are arranged. Then, the electrons emitted from the cathode 10 are controlled by the control electrode 9 to selectively strike the phosphor layer 8 of the display section B to emit light.

[0009]

By the way, in the conventional fluorescent display tube, in the filter formed on the inner surface of the substrate of the fluorescent display tube, the colored layer serving as the filter is formed of colored glass. Since the colored glass is insulative, it does not act as an electrode, and when the colored layer made of colored glass is formed in the fluorescent display tube, the phosphor layer cannot be directly provided on the inner surface of the colored layer. Therefore, first, a colored layer is formed on the inner surface of the substrate, and then an anode conductor and a phosphor layer are sequentially formed.

However, when the anode conductor is formed on the upper surface of the colored layer by the photolithography method, the acid or alkali aqueous solution used especially in the etching or resist stripping process is used.
There are problems that the characteristics of the colored layer as a filter are changed and the colored layer itself is deteriorated.

The colored layer made of colored glass has a certain thickness (several tens of μm) in order to have a filter function.
is necessary. Furthermore, since the colored layer is formed by screen printing or the like and then baked, unevenness is inevitably generated on the surface of the colored layer. Moreover, the substrate itself is deformed by firing. Therefore, even if an attempt is made to form a thin film anode conductor on the surface of the colored layer, there is a problem in that it cannot be formed accurately due to the irregularities and the deformation of the substrate itself.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a fluorescent display tube having a colored layer as a filter and capable of forming an anode conductor with high accuracy.

[0013]

According to the structure of the present invention, a display portion including at least a transparent anode conductor and a phosphor layer is formed on an inner surface of a substrate forming a part of an airtight envelope, and the airtightness is improved. In a fluorescent display tube in which a control electrode and a cathode are disposed inside the envelope so as to face the display unit, and the light emission from the display unit is observed through the substrate, the display unit is formed on the inner surface of the substrate. The transparent anode conductor and the anode conductor formed on the inner surface of the anode conductor have the same conductivity, but the thickness in the film thickness direction is smaller than the width in the surface direction, and the electric resistance value in the film thickness direction is compared with the electric resistance value in the surface direction. And a phosphor layer adhered to the inner surface of the colored layer.

As another configuration, the colored layer is formed of a glass film containing a metal colloid or metal ions.

[0015]

Since the colored layer has the conductivity in the thickness direction, the anode conductor can be directly formed on the inner surface of the substrate, and the phosphor layer can be formed on the inner surface via the colored layer.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the drawings. FIG. 1 shows an example of a fluorescent display tube according to the present invention, and is an enlarged sectional view of a substrate on which a display portion is formed. In addition, as a display type of the fluorescent display tube, a configuration capable of graphic display is shown.

Reference numeral 11 in the figure denotes a light-transmissive substrate made of a glass plate or the like, which constitutes an airtight envelope with a side plate and a back plate although not shown. A display portion C is formed on the inner surface of the substrate 11.

The display portion C is formed by the anode conductor 12, the colored layers 21, 22, 23 having conductivity only in the thickness direction, and the phosphor layer 13. First, for the anode conductor,
Stripes are formed on the inner surface of the substrate 1. The anode conductor 12 has a transparent conductive film or a thin metal film having stripe-shaped or mesh-shaped openings, and has a light-transmitting property.

Further, on the inner surface of the anode conductor 12, a blue-transmitting colored layer 21, a red light-transmitting coloring layer 22, and a green light-transmitting coloring layer 23 are provided. The phosphor layer 13 is formed on the inner surface of each of the colored layers 21, 22, and 23 by using a phosphor having a wide emission wavelength range such as a ZnO: Zn phosphor. Light emitted from the phosphor layer 13 is transmitted through the colored layers 21, 22, and 23 to blue, red,
Observed as a green emission color.

In addition, at a position facing the display portion C, a wire-shaped control electrode, for example, is stretched over the anode conductor in a direction orthogonal to the stripe direction and is arranged in a matrix with the anode conductor 12 to form a cathode. The electrons emitted from the anode conductor 12
Color graphic display is possible by selectively controlling with the control electrode.

Next, the colored layers 21, 22, and 23 will be described in detail. The colored layers 21, 22, and 23 are formed by a raster used in a coloring method for ceramic products in order to have conductivity in the thickness direction.

The raster is one which produces a glow by the interference effect of light, and the coloring layers 21, 2 by the raster.
Numerals 2 and 23 are screens prepared by dissolving a metal resin salt in a solvent (lavender oil, rosemary oil, etc.).
It is formed by depositing it on the anode conductor 12 by printing or the like and then firing it.

The colored layers 21 and 2 formed in this way
2 and 23 are metal yuloids 21a and 2 in the inorganic glass layer.
2a, 23a or contains metal ions and has a film thickness of 0.0
It is a very thin layer of 5 μm to 0.2 μm. Also, as the commercially available raster, N. Ikemukya Tsu door Co., Ltd. paste raster there is a "product number 20P (red), product number BL-15P (blue), product number GR-2P (green), and the like".

The colored layers 21, 22, and 23 formed by the raster are inorganic glass films, but they are very thin and include the metal colloids 21a, 22a, and 23a. Indicates conductivity. However, since there is a gap of several tens to several hundreds of μm between the adjacent anode conductors 12 and 12 even in the fluorescent display tube for graphic display, the colored layers 21, 22 and 23 are in contact with each other as shown in FIG. However, the insulation between the anode conductors 12 and 12 is maintained.

As described above, in the fluorescent display tube shown in the embodiment, the colored layers 21, 22, 23 are formed by the raster, and the colored layers 21, 22, 23 are made conductive only in the thickness direction. is there.

Therefore, in the display portion C, the anode conductor 12 is directly formed on the inner surface of the substrate 11, and the colored layers 21, 2 are formed on the inner surface.
2, 23 and the phosphor layer 13 may be sequentially formed. Therefore, since the anode conductor 12 is first formed on the inner surface of the substrate 11, the colored layers 21, 22 and 23 are not affected by the photolithography process when the anode conductor 12 is formed, and the characteristic as a filter is kept good. You can

On the contrary, the anode conductor 12 includes the colored layers 21,
It can be accurately formed on the inner surface of the substrate 11 without being affected by the unevenness of the grooves 22 and 23 or the deformation of the substrate 11 during firing. In particular, even when the arrangement interval of the anode conductors 12 is narrow like a fluorescent display tube for graphic display, it can be formed with a high yield.

[0028]

[Other Embodiments] FIG. 2 shows another embodiment of the fluorescent display tube of the present invention. Similar to the previous embodiment, a transparent conductive film or a metal thin film is provided on the inner surface of the substrate 11, and light-transmissive anode conductors 12 having stripe-shaped or mesh-shaped openings are arranged in a stripe shape.

[0029] Then similarly to the previous embodiment the anode conductor 12 inner surface is configured such that blue consisting of raster over, red, colored layers 21, 22 and 23 transmits green luminescent color is arranged.
Further, the coloring layer 21 and the coloring layer 22, and the coloring layer 22 and the coloring layer 2
3 is a configuration in which the anode conductors 12 and 12 are overlapped with each other.

On the inner surface of the colored layers 21, 22, 23,
As in the conventional case, the phosphor layer 13 is formed by depositing a phosphor such as ZnO: Zn having a wide emission wavelength range. Then, these anode conductors 12, colored layers 21, 22, 23,
The display portion D is formed by the phosphor layer 13.

By stacking the colored layers 21, 22, and 23 in this way, it is possible to efficiently absorb the external light received by the fluorescent display tube, the light emitted from the fluorescent material layer 13, and the reflected light from the control electrode. With such a structure, it is not necessary to provide an insulating layer for light shielding unlike the conventional case.

Further, since the colored layers 21, 22, and 23 are slightly conductive, the electrons emitted from the cathode are prevented from being charged in the colored layers 21, 22, and 23,
It does not adversely affect the display. Further, similarly to the above-described embodiment, the colored layers 21, 22, and 23 can well maintain the characteristics as a filter, and the anode conductor 12 can be accurately formed.

The display type of the fluorescent display tube can be applied to not only the graphic display but also the character display fluorescent display for displaying a specific character or figure.
Further, in the previous example, the one in which the luminescent color transmitted by the colored film is selected and the desired display is performed is shown, but the luminescent color close to the desired display color is used, and coloring is performed. by layer, also by <br/> physician as a raise the color purity of the luminescent color. When the emission color is a desired emission color among the plurality of types of phosphors, the colored layer may not be provided in that portion.

[0034]

[Effect] With the configuration as described above, the anode conductor can be formed on the substrate before the firing step, and the anode conductor can be formed with high accuracy. Further, since the colored layer is formed after the anode conductor is formed, the characteristics of the colored layer as a filter can be favorably maintained without being affected by the photolithography process or the like when forming the anode conductor.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an example of a fluorescent display tube of the present invention.

FIG. 2 is a partial cross-sectional view showing another example of the fluorescent display tube of the present invention.

FIG. 3 is a side sectional view of a conventional fluorescent display tube.

[Explanation of symbols]

 11 Substrate 12 Anode Conductor 13 Phosphor Layer 21 Coloring Layer 22 Coloring Layer 23 Coloring Layer C Display Part D Display Part

Claims (2)

(57) [Scope of utility model registration request] 1. An inner surface of a substrate forming a part of an airtight envelope,
A display portion including at least a light-transmissive anode conductor and a phosphor layer is formed, and a control electrode and a cathode are disposed inside the airtight envelope so as to face the display portion, and emit light from the display portion. In the fluorescent display tube for observing through the substrate, the display unit includes a translucent anode conductor formed on the inner surface of the substrate and a conductivity formed on the inner surface of the anode conductor.
Equal, but the thickness in the film thickness direction is smaller than the width in the surface direction
Has a smaller electrical resistance value than that in the surface direction.
A fluorescent display tube comprising a color layer and a phosphor layer deposited on the inner surface of the colored layer. 2. The fluorescent display tube according to claim 1, wherein the colored layer is composed of a glass film containing a metal colloid or metal ions.