JPH05190079A - Transparent cold cathode and its manufacture and cold cathode discharge tube - Google Patents

Abstract

PURPOSE:To materialize a transparent cold cathode which does not absorb the ingredients having entered cold cathode, among luminous fluxes generated by negative glow, and enables it to be effectively made use of for indication or illumination, and can elevate the emission efficiency of the cold cathode discharge tube. CONSTITUTION:A transparent cold cathode 1 is provided with a cathode substrate 3 consisting of a transparent conductive film, an amorphous semiconductor layer 4 equipped with transparency covering the surface of the cathode substrate 3, and an amorphous emitter layer 5 equipped with transparency covering the surface of that semiconductor layer 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent cold cathode, a method of manufacturing the same, and a cold cathode discharge tube, and more particularly, to a cathode substrate formed of a transparent conductive film and an amorphous semiconductor layer having a light transmitting property. The present invention also relates to a transparent cold cathode composed of an amorphous emitter layer having a light-transmitting property, a method for producing the transparent cold cathode, and a cold cathode discharge tube using the transparent cold cathode.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, a cold cathode a in a cold cathode discharge tube of a DC type plasma display panel and a cathode substrate c formed on an inner surface of a back substrate b made of ceramic or glass. , An emitter layer d covering the surface of the cathode substrate c. The emitter layer d is formed to reduce the discharge voltage and improve the sputtering resistance.

The cold cathode a is arranged so as to face a transparent anode f adhered and formed on the inner surface of a front substrate e having a light-transmitting property by a spacer or the like (not shown) with a predetermined discharge gap g therebetween. To be done. Then, the peripheral edges of the rear substrate b and the front substrate e are hermetically sealed with a sealing material or the like not shown, and the discharge gap g is filled with a discharge gas such as Ne or Ar to form a cold cathode discharge tube h. To be done.

However, when a DC voltage is applied between the cold cathode a and the transparent anode f, a negative glow is generated by the discharge in the discharge gap g, and the luminous flux due to the negative glow passes through the transparent anode f. Then, it is radiated forward (upward in the figure) from the front substrate e, and the radiated luminous flux is used for various displays and illuminations.

[0005]

However, in the above-mentioned conventional cold cathode discharge tube h, the cathode substrate c of the cold cathode a is made of a material having no light-transmitting property such as Ni, Cu, W and Mo. Therefore, of the luminous flux generated in the discharge gap g, the component incident on the cold cathode a is absorbed by the cold cathode a and cannot be used for display or illumination.
The luminous efficiency was low.

The present invention has been made in view of the above-mentioned problems of the conventional example, and in the luminous flux generated by the negative glow, the component incident on the cold cathode is not absorbed by the cold cathode. Therefore, it is an object of the present invention to realize a transparent cold cathode which can be effectively used for display or illumination and which can enhance the luminous efficiency of the cold cathode discharge tube. Another object is to realize a cold cathode discharge tube using such a transparent cold cathode.

[0007]

In order to achieve the above object, a transparent cold cathode according to the present invention comprises a cathode substrate made of a transparent conductive film and an amorphous material having a light-transmitting property for coating the surface of the cathode substrate. And a light-transmissive amorphous emitter layer that covers the surface of the semiconductor layer. The semiconductor layer is, for example, Ni.
A semiconductor material containing one or more kinds of metal oxides selected from the group consisting of O, Cu ₂ O, MoO ₂ and W ₂ O ₃ is formed in a transparent amorphous state. The emitter layer is, for example, an oxide of an alkaline earth metal element,
An emitter material (BaO.La ₂ O ₃ etc.) containing one or more kinds of metal oxides selected from the group consisting of oxides of alkali metal elements and oxides of rare earth elements is formed into an amorphous state having a light-transmitting property. Formed.

The transparent cold cathode is formed, for example, by forming a transparent conductive film to form a cathode substrate, and the surface of the cathode substrate is selected from the group consisting of metal alkoxides and carboxylates having the property of becoming semiconductors by oxidation. A material containing one or more kinds of organic metal is attached and heated at a temperature not lower than the decomposition temperature of the organic metal and lower than the crystallization temperature to decompose the organic metal and thereby a semiconductor containing a metal oxide. The substance is formed into an amorphous state having a light-transmitting property, so that a semiconductor layer that covers the surface of the cathode substrate is formed, and
A material containing at least one organic metal selected from the group consisting of alkaline earth metal elements, alkoxides of metals containing alkali metal elements or rare earth elements, and carboxylates is attached to the surface of the semiconductor layer, By heating at a temperature not lower than the decomposition temperature of the organic metal and lower than the crystallization temperature, the organic metal is decomposed to be an oxide of an alkaline earth metal element, an oxide of an alkali metal element and an oxide of a rare earth element. It is manufactured by forming an emitter material containing one or more kinds of metal oxides selected from the group into an amorphous state having a light-transmitting property, and thereby forming an emitter layer covering the surface of the semiconductor layer.

In the cold cathode discharge tube according to the present invention, a first substrate and a second substrate are arranged so as to face each other with a predetermined discharge gap therebetween, and a surface of the first substrate facing the second substrate. A cold cathode is formed on the substrate, and an anode is formed on the surface of the second substrate facing the first substrate, and the peripheral edges of the two substrates are hermetically sealed to form an envelope. In a cold cathode discharge tube in which a discharge gas is filled in, the first substrate and the second substrate are formed of a translucent insulating material, and the cold cathode is a cathode substrate made of a transparent conductive film, and the cathode is made of a transparent conductive film. A transparent cold cathode having a translucent amorphous semiconductor layer that covers the surface of the substrate and a translucent amorphous emitter layer that covers the surface of the semiconductor layer. ,
The anode is composed of a transparent anode made of a transparent conductive film, and a reflective layer is formed on the outer surface of either one of the first substrate and the second substrate.

Further, a first substrate and a second substrate made of a translucent insulating material are opposed to each other with a predetermined discharge gap, and the peripheral edges of both substrates are hermetically sealed to form an envelope. A discharge gas is sealed in the envelope, and a plurality of reflecting members are formed on the surface of the first substrate facing the second substrate at predetermined intervals, and the light transmitting property is provided between the reflecting members. An electrode supporting plate made of an insulating material is erected, and either one of a cold cathode and an anode is adhered and formed on both surfaces of the electrode supporting plate to form a first electrode. A second substrate of the first substrate. A cold cathode discharge tube in which one of the cold cathode and the other anode is formed on the surface opposite to the above to form a second electrode corresponding to the first electrode, wherein the cold cathode is a transparent conductive film. A cathode substrate, an amorphous semiconductor layer having a light-transmitting property that covers the surface of the cathode substrate, and a semiconductor layer that covers the semiconductor layer. Together constituting a transparent cold cathode consisting of amorphous emitter layer having translucency, comprising constituted by a transparent anode made of the anode of a transparent conductive film.

Furthermore, a comb-teeth-shaped cold cathode and an anode are respectively provided on one surface of a plurality of substrates made of a translucent insulating material so that the comb-teeth portions of both electrodes are alternately arranged with a predetermined gap. And the electrodes are formed side by side so that the electrode-formed surface and the electrode-unformed surface face each other with a predetermined discharge gap.
What is claimed is: 1. A cold cathode discharge tube in which a light emitting portion is surrounded by a reflecting means to surround the substrate and is housed together with a discharge gas in an airtight container, the cold cathode being a cathode made of a transparent conductive film. A transparent cold cathode including a substrate, a light-transmissive amorphous semiconductor layer that covers the surface of the cathode substrate, and a light-transmissive amorphous emitter layer that covers the semiconductor layer. At the same time, the anode is formed of a transparent anode made of a transparent conductive film.

[0012]

Since the transparent cold cathode according to the present invention is formed by laminating the cathode substrate made of the transparent conductive film as described above, and the amorphous semiconductor layer and the emitter layer having a light transmitting property,
The entire cathode has translucency. Therefore, of the luminous flux of negative glow generated by the discharge, the component incident on the cold cathode is not absorbed by the cold cathode. Therefore, as described above, by adopting the transparent cold cathode according to the present invention as the cold cathode of the cold cathode discharge tube and combining it with an appropriate reflection means (reflection layer, reflection member), most of the luminous flux due to negative glow is obtained. Can be effectively used for display or illumination, and the luminous efficiency of the cold cathode discharge tube can be improved.

The above-mentioned emitter layer has a feature that it has a small work function and is strong against ion bombardment, so that it can reduce discharge voltage and improve spatter resistance. The reason for forming the semiconductor layer between the cathode substrate and the emitter layer is as follows. That is, since the cathode substrate of the lowermost layer is a good conductor and the emitter layer of the uppermost layer is an insulator, if the emitter layer is formed directly on the cathode substrate, the work function between them, that is, the electron mobility is extremely different. However, the discharge characteristics are deteriorated. Therefore, in the transparent cold cathode according to the present invention, the semiconductor layer is interposed between the two,
The work function of the entire transparent cold cathode is formed so as to gradually increase from the upper layer portion to the lower layer portion.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiments. FIG. 1 is a schematic cross-sectional view showing a transparent cold cathode 1 according to the present invention. The transparent cold cathode 1 is adhered and formed on one surface of a substrate 2 formed of a translucent insulating material such as glass. It has a three-layer structure including a cathode substrate 3, a semiconductor layer 4 deposited on the surface of the cathode substrate 3, and an emitter layer 5 deposited on the surface of the semiconductor layer 4.

The cathode substrate 3 is a NESA film (Sn
It is formed of a transparent conductive film such as O ₂ ) or an ITO film (In ₂ O ₃ .SnO ₂ ). The semiconductor layer 4 is made of Ni.
It is formed of a transparent semiconductor film in which O or the like is formed in a light-transmitting amorphous state. Further, the emitter layer 5 is formed of an emitter material in which BaO.La ₂ O ₃ or the like is formed in an amorphous state having a light transmitting property.

Next, a method for manufacturing the transparent cold cathode 1 will be described. First, a transparent conductive film such as a NESA film or an ITO film is deposited on the surface of the substrate 2 by a conventionally-used method such as etching, printing, plating or vapor deposition to form the cathode substrate 3.

Next, a material containing at least one kind of organic metal selected from the group consisting of alkoxides and carboxylates of metals having the property of becoming semiconductors by oxidation is attached to the surface of the cathode substrate 3, and By heating at a temperature not lower than the decomposition temperature of the organic metal and lower than the crystallization temperature to decompose the organic metal to form a semiconductor material containing a metal oxide in an amorphous state having a light-transmitting property. The semiconductor layer 4 that covers the surface of the cathode substrate 3 is formed.

As the material to be attached to the surface of the cathode substrate 3, specifically, nickel caprate 10% (weight ratio, the same hereinafter), butyl alcohol 77%, stearyl alcohol 10%, stearic acid 2% and Rosin 1
% Of the liquid, which is applied onto the cathode substrate 3 by means of printing, spraying, dipping, coating, etc., and then at a temperature above the decomposition temperature of nickel caprate and below the crystallization temperature. It decomposes by heating at a working temperature (400-600 ° C) during the manufacturing process of a cold cathode discharge tube.
Amorphous NiO having a light-transmitting property is fixed to the surface of the cathode substrate 3 to form the semiconductor layer 4.

Finally, the surface of the semiconductor layer 4 contains at least one kind of organic metal selected from the group consisting of alkali earth metal elements, alkoxides of metals containing alkali metal elements or rare earth elements, and carboxylates. Decompose the organic metal by attaching a material and heating it at a temperature not lower than the decomposition temperature of the organic metal and lower than the crystallization temperature,
A light-transmitting amorphous emitter material containing one or more kinds of metal oxides selected from the group consisting of oxides of alkaline earth metal elements, oxides of alkali metal elements and oxides of rare earth elements. Fixed to the surface of the semiconductor layer 4,
Thus, the emitter layer 5 is formed.

As a material to be adhered to the surface of the semiconductor layer 4, specifically, a mixture of 3% barium butyrate and 8% lanthanum butyrate, 75% butyl alcohol, 10% cetyl alcohol and 4% stearic acid is used. Of the cold cathode discharge tube having a temperature not lower than the decomposition temperature of barium butyrate and lanthanum butyrate and lower than the crystallization temperature by adhering it onto the cathode substrate 3 by means such as printing, spraying, dipping, and coating. Amorphous B that is transparent and decomposes by heating at the working temperature (400-600 ° C) during the manufacturing process.
The emitter layer 5 is formed by fixing aO.La ₂ O ₃ on the surface of the semiconductor layer 4.

In the above, NiO is used as the semiconductor layer 4.
However, the present invention is not limited to this, and Cu ₂ O, MoO ₂ , W ₂
The semiconductor layer 4 may be formed of O ₃ or the like. Also, B
When the emitter layer 5 was formed of aO.La ₂ O ₃ , the discharge voltage was the lowest and good results were obtained, but of course the invention is not limited to this, and MgO, CaO, SrO, Ba
O (oxide of alkaline earth metal element), Cs ₂ O, Na ₂
O, K ₂ O (oxide of alkali metal element), CeO ₂ , Y
₂ O ₃ , Gd ₂ O ₃ (oxides of rare earth elements), BaO · Sr
_{O, BaLa 2 O, CsLaO 2} ( obtained by conjugation of the metal oxide), the _{BaO · Al 2 O 3, NiO} · BaO ( composite metal oxide of the metal oxide and other metal oxides), etc. The emitter layer 5 may be formed.

As described above, since the thermal decomposition treatment required for forming the semiconductor layer 4 and the emitter layer 5 can utilize the working temperature (400 to 600 ° C.) during the manufacturing process of the cold cathode discharge tube, there is nothing. There is no need to use a special high temperature heating device.

Next, the first cold cathode discharge tube 10 using the cold cathode 1 will be described with reference to FIG. In the figure,
The first cold cathode discharge tube 10 as a direct current type plasma display comprises a rear substrate 11 formed of a translucent insulating material such as glass, and a transparent cold cathode 1 formed on the inner surface of the rear substrate 11. A front substrate 12 formed of a translucent insulating material such as glass, and a transparent anode 13 formed on the inner surface of the front substrate 12.

The transparent cold cathode 1 is made of a NESA film or ITO.
A cathode base 3 formed of a transparent conductive film such as a film, an amorphous semiconductor layer 4 such as NiO that covers the surface of the cathode base 3, and Ba that covers the semiconductor layer 4.
It has an amorphous emitter layer 5 having a light-transmitting property such as O · La ₂ O ₃ . The transparent anode 13 is made of N
It is formed of a transparent conductive film such as an ESA film or an ITO film.

The rear substrate 11 and the front substrate 12 are provided on the transparent cold cathode 1 and the transparent anode 13 by a spacer (not shown) or the like.
And are arranged so as to face each other with a predetermined discharge gap,
The peripheral edges of the two substrates 11 and 13 are hermetically sealed by a sealing material (not shown) to form an envelope. Ne, Ar, He, X are contained in the discharge space 14 formed inside the envelope.
A discharge gas mainly containing a rare gas such as e is filled.

On the outer surface of the back substrate 11, a first reflective layer made of aluminum foil, aluminum vapor deposition film or the like is provided.
15 are formed.

When a DC voltage is applied between the transparent anode 13 and the transparent cold cathode 1, a discharge is generated in the discharge space 14 and a negative glow 16 is generated by the discharge. Then, of the light flux from the negative glow 16, the component radiated to the transparent anode 13 side is as it is, the transparent anode 13 and the front substrate 12
And is emitted to the display side 17 in the light emission direction of the first cold cathode discharge tube 10. On the other hand, of the luminous flux, the component radiated to the transparent cold cathode 1 side passes through the transparent cold cathode 1 and the rear substrate 11 and reaches the first reflective layer 15, where it is reflected and again reflected on the rear substrate 11 and The light passes through the transparent cold cathode 1 and reaches the discharge space 14, and then passes through the transparent anode 13 and the front substrate 12 and is emitted to the display side 17.

As described above, in the first cold cathode discharge tube 10, since most of the luminous flux due to the negative glow 16 generated in the discharge space 14 can be utilized for display, the first cold cathode discharge tube 10 can be used. The luminous efficiency of the tube 10 can be increased. In addition,
Although the transparent cold cathode 1 is formed on the inner surface of the rear substrate 11 in this embodiment, the present invention is not limited to this. That is, the same effect can be obtained by forming the transparent cold cathode 1 on the inner surface of the front substrate 12 and the transparent anode 13 on the inner surface of the rear substrate 11.

Next, the second cold cathode discharge tube 20 according to the present invention will be described with reference to FIGS. 3 and 4. The second cold cathode discharge tube 20 is formed on the back substrate 11, a band-shaped transparent anode 13 adhered to the inner surface of the back substrate 11, and a transparent anode 13 formed on the surface of the back electrode 11, and has a triangular cross section. Multiple reflective members to present 2
1, 21 and also standing on the surface of the transparent anode 13,
An electrode support plate 22 located between the reflection members 21 and 21,
Strip-shaped transparent cold cathodes 1 and 1 formed on the left and right surfaces of the electrode support plate 22 and a front substrate which is arranged to face the rear substrate 11 with a predetermined discharge gap by a spacer or the like (not shown). 12 and. Back substrate 1 above
1, the front substrate 12 and the electrode support plate 22 are both formed of a translucent insulating material such as glass. Further, on the side surfaces of the reflecting members 21, 21, second reflecting layers 23, 23 made of aluminum foil, an aluminum vapor deposition film or the like and facing the transparent cold cathodes 1, 1 are formed. Further, the peripheral edges of the back substrate 11 and the front substrate 12 are hermetically sealed with a sealing material (not shown) or the like to form an envelope. In the discharge space 14 formed in the envelope, Ne, A discharge gas mainly containing a rare gas such as Ar, He, Xe is filled.

However, when a DC voltage is applied between the transparent anode 13 and the transparent cold cathodes 1, 1, the transparent cold cathodes 1, 1 are cooled.
A discharge is generated between the transparent anode 13 and the transparent anode 13, and negative glows 16, 16 are generated in the discharge space 14 by the discharge. This negative glow 1
The components of the light fluxes 6 and 16 emitted to the front substrate 12 side pass through the front substrate 12 as they are and proceed to the display side 17. The components radiated to the reflecting members 21, 21 side are reflected by the second reflecting layers 23, 23 on the side surfaces of the reflecting members 21, 21 and pass through the front substrate 12 to proceed to the display side 17. On the other hand, the components radiated to the transparent cold cathodes 1 and 1 side are as they are.
And through the electrode support plate 22, further through the transparent cold cathode 1 on the opposite side, and enters the reflecting member 21 on the opposite side, and is reflected by the reflecting layer 23 to pass through the front substrate 12 and the display side 17 Proceed to.

As described above, according to this embodiment, the negative glow
The light flux from 16, 16 can be captured in a wide range and used for display. Although not shown, if a reflective layer is formed on the outer side of the back substrate 11 as in the above embodiment,
The luminous flux incident on the transparent anode 13 side can also be used for display.

3 and 4, only two reflecting members 21 and 21 and one electrode supporting plate 22 provided between the reflecting members 21 and 21 are shown for convenience of illustration. One discharge cell, which is the minimum unit, is formed by the above, and the required number of discharge cells are actually formed in a dot matrix. Further, a boundary between the discharge cells may be clarified by providing a partition wall between the transparent anodes 13 and 13. In this embodiment, the transparent anode 13 is connected to the rear substrate 11
The transparent cold cathodes 1 and 1 are formed on the electrode support plate 22.
The transparent cold cathode 1 was formed on both sides of the back substrate.
The same effect can be obtained by forming the transparent anode 13 on the upper surface of the electrode support plate 22 and forming the transparent anode 13 on both surfaces of the electrode support plate 22.

Next, a display discharge lamp 30 as another embodiment of the cold cathode discharge tube according to the present invention will be described with reference to FIGS. The display discharge lamp 30 includes an airtight container 31.
And a light-emitting block 32 enclosed in the airtight container 31, the airtight container 31 has a convex lens portion 33 for condensing light in the upper direction, which is the direction of light emission, and has a lower opening. The main body 34 has a cup shape, and the lid 35 closes the opening of the main body 34.

Further, as shown in FIG. 6, the light emitting block 32 is provided with a bottom reflection plate 37 fixed on a stem 36 formed on the top surface of the lid 35 and a top reflection plate 37. 1st, 2nd, 3rd, 4th, and 5th translucent insulating substrates 38, 39, 40, 41, 42 provided, and a front reflector 43 surrounding them.
It comprises a back reflector 44 and a side reflector 45. The bottom reflection plate 37, the front reflection plate 43, the back reflection plate 44, and the side reflection plate 45 are each made of a thin plate such as aluminum. In addition, on the left side surface of the first translucent insulating substrate 38,
A third reflective layer 46 made of aluminum foil or aluminum vapor deposition film is formed. Therefore, each of the first to fifth translucent insulating substrates 38 to 42 has a bottom reflection plate 37, a front reflection plate 43, a back reflection plate 44, around its periphery except for the upper side 47 which is a light emitting portion. It is surrounded by the side reflector 45 and the third reflective layer 46.

As shown in FIG. 7, a comb-teeth-shaped transparent cold cathode 48 and a comb-teeth-shaped transparent anode 49 are formed on one surface of the second light-transmissive insulating substrate 39. Are formed so as to be alternately arranged side by side. Although not shown, the comb-teeth-shaped transparent cold cathode 48 is, like the transparent cold cathode 1, a cathode substrate formed of a transparent conductive film such as a NESA film or an ITO film, and an amorphous material having a light-transmitting property. A semiconductor layer and an amorphous emitter layer having a light-transmitting property, and a lead wire connecting portion 50 is formed at the lower end thereof. The comb-shaped transparent anode 49 is made of a transparent conductive film such as a NESA film or an ITO film, and a lead wire connecting portion 51 is formed at the lower end thereof. The above third, fourth and fifth
The translucent insulating substrates 40, 41, 42 also have the same configuration as the second translucent insulating substrate 39. The first translucent insulating substrate 38 also has the same configuration as the second translucent insulating substrate 39 except that the third reflective layer 46 is formed on the left side surface thereof.

The above first to fifth translucent insulating substrates 39 to 42
Are erected on the bottom reflection plate 37 such that the electrode-formed surface and the electrode-unformed surface are opposed to each other at regular intervals. In addition, the side reflector 45 is also the bottom reflector 37.
The fifth light-transmissive insulating substrate 42 and the fifth light-transmissive insulating substrate 42 are erected on the upper side thereof with a constant space.

A first lead wire 52 provided in the stem 36 is connected to the lead wire connecting portion 50 of each of the comb-shaped transparent cold cathodes 48, and the first lead wire 52 is the first lead wire 52. Connected to the external terminal 53 of. In addition, the lead wire connecting portions 51 of the respective comb-teeth-shaped transparent anodes 49 are also connected to the second lead wires 54 also arranged in the stem 36, and the second lead wires are also connected.
54 is connected to the second external terminal 55. Note that the airtight container 31 is exhausted through the exhaust pipe 56 provided in the lid portion 35 of the airtight container 31.
After the air inside is exhausted, Ne, A
A discharge gas such as r, He, or Xe is filled, and then the exhaust pipe 56 is burnt off.

Thus, the first external terminal 53 and the second external terminal 53
When a DC voltage is applied between the comb-teeth-shaped transparent cold cathode 48 and the comb-teeth-shaped transparent anode 49 via the external terminal 55, the light-transmissive insulating substrates 38 to 42 are formed on the sides of the first to fifth translucent insulating substrates 38 to 42. Discharge occurs in the generated discharge gap, and negative glow is generated by the discharge.
A component of the light flux due to the negative glow that travels above the airtight container 31 passes through the convex lens portion 33 and is emitted to the outside. In addition, the components that proceed in the other directions are transparent to the comb-shaped transparent cold cathode 48, the comb-shaped transparent anode 49, and the first to fifth transparent insulating substrates 38 to 42. From the above, the bottom reflection plate 37, the front reflection plate 43, the back reflection plate 44,
Reach either the side reflector 45 or the third reflector layer 46,
There, it is reflected, and finally the upper side of the light emitting block 32.
The light enters the convex lens portion 33 of the airtight container 31 through 47 and is emitted to the outside from there. Therefore, the luminous flux generated by the negative glow can be effectively used for display or illumination without wasting.

[0039]

As described above, the transparent cold cathode according to the present invention comprises a cathode substrate made of a transparent conductive film, an amorphous semiconductor layer having a light transmitting property, and an amorphous emitter having a light transmitting property. Since the cathode as a whole has a light-transmitting property, the components of the negative glow light flux generated by the discharge that have entered the transparent cold cathode are not absorbed by the transparent cold cathode itself.

Therefore, if a cold cathode discharge tube is formed using this transparent cold cathode, the luminous flux incident on the transparent cold cathode is
It can be used as it is for display or illumination, or it can be used for display or illumination by guiding it in the light emission direction of the cold cathode discharge tube through an appropriate reflection means. The luminous efficiency of the cold cathode discharge tube can be increased.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a transparent cold cathode according to the present invention.

FIG. 2 is a schematic sectional view showing an embodiment of a cold cathode discharge tube according to the present invention.

FIG. 3 is a schematic sectional view showing another embodiment of the cold cathode discharge tube according to the present invention.

FIG. 4 is a schematic perspective view of the above embodiment.

FIG. 5 is a schematic cross-sectional view showing another embodiment of the cold cathode discharge tube according to the present invention.

FIG. 6 is a schematic perspective view showing a light emitting block according to the above embodiment.

FIG. 7 is a schematic perspective view showing a translucent insulating substrate that constitutes the light emitting block.

FIG. 8 is a schematic perspective view showing a cold cathode discharge tube according to a conventional example.

[Explanation of symbols]

 1 Transparent Cold Cathode 2 Substrate 3 Cathode Base 4 Semiconductor Layer 5 Emitter Layer 10 First Cold Cathode Discharge Tube 11 Rear Substrate 12 Front Substrate 13 Transparent Anode 14 Discharge Space 15 First Reflection Layer 16 Negative Glow 20 Second Cold Cathode Discharge tube 21 Reflective member 22 Electrode support plate 23 Second reflective layer 30 Display discharge lamp 31 Airtight container 37 Bottom reflector 38 First translucent insulating substrate 39 Second translucent insulating substrate 40 Third translucent substrate Insulating substrate 41 4th translucent insulating substrate 42 5th translucent insulating substrate 43 Front reflector 44 Back reflector 45 Side reflector 46 Third reflector 47 Upper side 48 Comb-shaped transparent cold cathode 49 Comb-shaped transparent anode

Claims (9)

[Claims] 1. A cathode substrate made of a transparent conductive film, a light-transmissive amorphous semiconductor layer that covers the surface of the cathode substrate, and a light-transmissive amorphous layer that covers the surface of the semiconductor layer. Cold cathode having a striped emitter layer. 2. The semiconductor layer comprises NiO, Cu ₂ O, M
The semiconductor material containing at least one kind of metal oxide selected from the group consisting of oO ₂ and W ₂ O ₃ is formed in an amorphous state having a light-transmitting property. The transparent cold cathode described. 3. The emitter layer comprises an emitter material containing at least one metal oxide selected from the group consisting of oxides of alkaline earth metal elements, oxides of alkali metal elements and oxides of rare earth elements. The transparent cold cathode according to claim 1 or 2, wherein the transparent cold cathode is formed in an amorphous state having a light-transmitting property. 4. The transparent cold cathode according to claim 3, wherein the emitter layer is formed by forming BaO.La ₂ O ₃ in an amorphous state having a light transmitting property. 5. A transparent conductive film is formed to form a cathode substrate,
A material containing one or more kinds of organic metal selected from the group consisting of alkoxides and carboxylates of metals having the property of becoming semiconductors by oxidation is adhered to the surface of the cathode substrate, and this is attached at the decomposition temperature of the above-mentioned organic metals. As described above, by heating at a temperature lower than the crystallization temperature, the organic metal is decomposed to form a semiconductor material containing a metal oxide in an amorphous state having a light-transmitting property, and thus a surface of the cathode substrate is covered with a semiconductor. A transparent cold cathode characterized by forming a layer and fixing an amorphous emitter material having a light-transmitting property to the surface of the semiconductor layer to form an emitter layer covering the surface of the semiconductor layer. Production method. 6. A transparent conductive film is formed to form a cathode substrate,
An amorphous semiconductor substance having a light-transmitting property is fixed to the surface of the cathode substrate to form a semiconductor layer covering the surface of the cathode substrate, and an alkaline earth metal element, an alkali is formed on the surface of the semiconductor layer. A material containing one or more kinds of organic metals selected from the group consisting of alkoxides and carboxylates of metals containing metal elements or rare earth elements is attached, and this is attached at a temperature not lower than the decomposition temperature of the above-mentioned organic metals and lower than the crystallization temperature. By heating to decompose the organic metal to include one or more metal oxides selected from the group consisting of oxides of alkaline earth metal elements, oxides of alkali metal elements and oxides of rare earth elements. A method for producing a transparent cold cathode, which comprises forming an emitter material in an amorphous state having a light-transmitting property, and thereby forming an emitter layer covering the surface of the semiconductor layer. 7. A first substrate and a second substrate are arranged to face each other with a predetermined discharge gap, and a cold cathode is formed on a surface of the first substrate facing the second substrate, and An anode is formed on the surface of the second substrate facing the first substrate, the peripheral edges of the two substrates are hermetically sealed to form an envelope, and a discharge gas is enclosed in the envelope. In the cold cathode discharge tube, the first substrate and the second substrate are formed of a translucent insulating material, and the cold cathode is a cathode substrate made of a transparent conductive film, and a light transmissive material covering the surface of the cathode substrate. Composed of a transparent cold cathode having a transparent amorphous semiconductor layer and a light-transmitting amorphous emitter layer for covering the surface of the semiconductor layer, wherein the anode is made of a transparent conductive film. Which is a transparent anode, and is provided outside either one of the first substrate and the second substrate. A cold cathode discharge tube, characterized in that a reflective layer is formed on the surface thereof. 8. A first substrate and a second substrate made of a translucent insulating material.
Of the first substrate and the first substrate of the first substrate, which are opposed to each other with a predetermined discharge gap, and hermetically seal the peripheral edges of both substrates to form an envelope. A plurality of reflecting members are formed on the surface facing the second substrate at predetermined intervals, and an electrode supporting plate made of a translucent insulating material is erected between the reflecting members, and both sides of the electrode supporting plate are provided. One of the cold cathode and the anode is adhered to form the first electrode, and the other of the cold cathode and the anode is adhered to the surface of the first substrate facing the second substrate. The second electrode corresponding to the first electrode
A cold cathode discharge tube serving as an electrode of the above, wherein the cold cathode is a cathode substrate made of a transparent conductive film, a translucent amorphous semiconductor layer covering the surface of the cathode substrate, and the semiconductor layer And a transparent cold cathode consisting of a light-transmitting amorphous emitter layer for covering
A cold cathode discharge tube, characterized in that the anode is constituted by a transparent anode made of a transparent conductive film. 9. A comb-teeth-shaped cold cathode and an anode are respectively provided on one surface of a plurality of substrates made of a translucent insulating material so that the comb-teeth portions of both electrodes are arranged alternately with a predetermined gap. Then, the substrates are arranged side by side so that the electrode-formed surface and the electrode-unformed surface face each other with a predetermined discharge gap therebetween, and a light emitting portion is left around the substrate by a reflecting means. A cold cathode discharge tube which is surrounded and is housed together with a discharge gas in an airtight container, wherein the cold cathode has a cathode base made of a transparent conductive film and a light-transmitting property for coating the surface of the cathode base. And a transparent cold cathode composed of an amorphous semiconductor layer and a light-transmitting amorphous emitter layer covering the semiconductor layer, and the anode is composed of a transparent anode composed of a transparent conductive film. A cold cathode discharge tube characterized by.