JP3116775B2 - Display fluorescent lamp and display element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp for display and a display element used as a light-emitting element for use in a large-sized image display device or an electric signboard.

[0002]

2. Description of the Related Art FIG. 39 and FIG.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view and a cross-sectional view showing a conventional display fluorescent lamp disclosed in Japanese Patent Application Laid-Open No. 190152, partially broken away, wherein 1 is a display fluorescent lamp, and 2 is a cylinder constituting the display fluorescent lamp 1. The glass bulb 3 is an internal electrode inserted into the glass bulb 2 from the lower end surface of the glass bulb 2.

[0003] Further, 4 is an external electrode provided on the outer surface of the glass bulb 2, 7 is a phosphor layer formed on the inner wall of the side face and lower end face of the glass bulb 2, and 8 is provided on the upper end face of the glass bulb 2. A light-transmitting light output unit. The above internal electrode 3
A power supply 6 is connected between the external electrodes 4 via lead wires 5a and 5b.

Next, the operation will be described. When an AC voltage is applied between the internal electrode 3 and the external electrode 4 from the power supply 6, a voltage is applied to the rare gas in the glass bulb 2 via glass, which is a dielectric, to cause discharge. The ultraviolet light generated during the discharge excites the phosphor layer 7 and is converted into a specific visible light determined by the phosphor.

Also, since the phosphor itself is white,
Visible light generated from the phosphor is almost totally reflected by the phosphor layer 7 formed on the inner wall of the glass bulb 2 and returns to the inside of the glass bulb 2. This visible light is output and radiated to the outside of the glass bulb 2 from the light output section 8 having only translucency,
Functions as a high-luminance light-emitting element.

[0006]

Since the conventional fluorescent lamp for display is configured as described above, it emits high-luminance light suitable as a light-emitting element of a large-sized image display device.
When the diameter of the glass bulb 2 is reduced in order to increase the arrangement density of the display fluorescent lamp 1 with the increase in the resolution of the large-sized image display device, the distance between the internal electrode 3 and the external electrode 4 is reduced, There has been a problem that the insulation distance for electrical insulation cannot be sufficiently secured.

The first invention has been made to solve the above problems, and provides a sufficient insulating distance between an internal electrode and an external electrode even when the diameter of the glass bulb is reduced. It is an object of the present invention to obtain a display fluorescent lamp capable of performing such a display.

A second object of the present invention is to provide a display fluorescent lamp capable of forming a phosphor layer uniformly.

A third object of the present invention is to provide a display fluorescent lamp which can reduce power consumption.

A fourth object of the present invention is to provide a fluorescent lamp for display capable of obtaining high luminance.

A fifth object of the present invention is to increase the insulation distance between an internal electrode and an external electrode without increasing the outer shape of the fluorescent lamp for display.

A sixth object of the present invention is to provide a display fluorescent lamp in which external electrodes can be continuously formed with a uniform thickness.

A seventh object of the present invention is to provide a display fluorescent lamp capable of pressing a connection space of a lead wire to an external electrode into an extended cylindrical surface of a cylindrical container.

An eighth aspect of the present invention is to provide a fluorescent lamp for display which can prevent adjacent external electrodes from being short-circuited.

A ninth aspect of the present invention is to provide a display fluorescent lamp which can easily print external electrodes on a cylindrical container.

A tenth aspect of the present invention is to provide a display fluorescent lamp which can form an external electrode simply by fitting a preformed cylindrical conductive material into a cylindrical container without complicated steps in printing. .

An eleventh aspect of the present invention is to provide a display fluorescent lamp capable of suppressing an increase in dark luminance due to reflection on a phosphor layer.

A twelfth object of the present invention is to provide a display fluorescent lamp capable of suppressing an increase in dark luminance by making the light transmittance constant over the entire visible light range.

A thirteenth aspect of the present invention is to provide a display fluorescent lamp capable of suppressing an increase in dark luminance by utilizing a light transmission characteristic corresponding to a wavelength of visible light.

A fourteenth invention aims to obtain a fluorescent lamp for display capable of improving the durability of the filter cap.

A fifteenth aspect of the present invention is to provide a display fluorescent lamp capable of increasing the aperture ratio.

A sixteenth aspect of the present invention is to provide a display fluorescent lamp which can easily form a cylindrical container.

According to a seventeenth aspect of the present invention, there is provided a display fluorescent lamp in which the light output portion is made of soda-lime glass and the cylindrical portion is made of lead glass, so that the light output portion and the cylindrical portion can be easily fused. With the goal.

An eighteenth aspect of the present invention is to provide a display fluorescent lamp capable of suppressing an increase in dark luminance due to reflection on a phosphor layer even when a flat light output section is used.

According to a nineteenth aspect of the present invention, even when a flat light output section is used, a display fluorescent lamp capable of suppressing an increase in dark luminance by keeping the light transmittance constant over the entire visible light range. The purpose is to:

According to a twentieth aspect, there is provided a display fluorescent lamp capable of suppressing an increase in dark luminance by utilizing a light transmission characteristic corresponding to a wavelength of visible light even when a flat light output portion is used. Aim.

An object of the twenty-first invention is to provide a fluorescent lamp for display which can suppress an increase in dark luminance by suppressing reflection of external light in a light output portion having a flat plate shape by means of minute hemispherical projections.

According to a twenty-second aspect, a concentric projection is provided.
Accordingly, it is an object of the present invention to obtain a display fluorescent lamp capable of suppressing reflection of external light at a light output section having a flat plate shape and suppressing an increase in dark luminance.

A twenty-third aspect of the present invention is to provide a display fluorescent lamp capable of stably controlling discharge.

A twenty-fourth aspect of the present invention is to provide a display fluorescent lamp capable of suppressing emission of light from a phosphor due to discharge at a second external electrode.

A twenty-fifth aspect of the present invention has an object to provide a display fluorescent lamp capable of suppressing the power consumed by the discharge at the second external electrode.

A twenty-sixth aspect of the present invention aims to obtain a display element capable of increasing the resolution of a display image by arranging display fluorescent lamps at a high density.

An object of the twenty-seventh aspect is to provide a display element capable of displaying a color image using the emission colors of red, green and blue.

A twenty-eighth aspect of the present invention is to provide a display device in which the luminance ratio of red, green, and blue is controlled.

A twenty-ninth aspect of the present invention has an object to provide a display element capable of selectively controlling lighting of each of a plurality of display fluorescent lamps with a small number of signal lines.

A thirtieth object of the present invention is to provide a display element capable of reliably preventing a short circuit between external electrodes of a fluorescent lamp for display adjacent to each other in parallel by coating an insulating tube.

A thirty-first aspect of the present invention has an object to provide a display element capable of reliably fixing an insulating tube to a display fluorescent lamp.

A thirty-second aspect of the present invention is to provide a display element capable of mounting and fixing an insulating tube to a display fluorescent lamp by utilizing the heat shrinkage of the tube.

A thirty-third invention is a display element capable of reliably preventing a short circuit between external electrodes and covering the entirety of each display fluorescent lamp by covering an adjacent display fluorescent lamp in parallel with an insulating cap. The purpose is to obtain.

A thirty-fourth aspect of the present invention is to provide a display element capable of suppressing an increase in dark luminance due to reflection on a phosphor layer even when an insulating cap is used.

A thirty-fifth aspect of the present invention is to provide a display element capable of suppressing an increase in dark luminance by keeping the light transmittance constant over the entire visible light range even when an insulating cap is used.

According to a thirty-sixth aspect, even when an insulating cap is used, a light transmission characteristic corresponding to a wavelength of visible light is utilized,
It is an object of the present invention to provide a display element capable of suppressing an increase in dark luminance.

A thirty-seventh aspect of the present invention aims to obtain a display element capable of improving the durability of an insulating cap.

A thirty-eighth aspect of the present invention is to provide a display element which can securely and undetachably attach an insulating cap to a display fluorescent lamp.

A thirty-ninth aspect of the present invention is to provide a display element capable of easily fixing an insulating cap to a cylindrical projection.

A fortieth object of the present invention is to provide a display element in which an insulating cap can be easily attached to a cylindrical convex portion, and the mutual engagement between them can be further strengthened.

A forty-first invention aims at providing a display element capable of suppressing an increase in dark luminance due to reflection on a phosphor layer by preventing the incidence of external light such as sunlight.

[0048]

According to a first aspect of the present invention, there is provided a display fluorescent lamp in which the axial length of the small-diameter portion of the cylindrical container is required for the voltage applied between the internal electrode and the external electrode. The insulation distance is larger than the insulation distance.

In the display fluorescent lamp according to the second aspect of the present invention, the phosphor layer is extended to a connection portion between the small diameter portion and the large diameter portion of the cylindrical container.

In the display fluorescent lamp according to the third invention, the length of the external electrode is shorter than the axial length of the large diameter portion of the cylindrical container.

In a display fluorescent lamp according to a fourth aspect of the present invention, the external electrode is formed near the bottom of the cylindrical container opposite to the light output portion on the large diameter side.

The display fluorescent lamp according to the fifth aspect of the present invention has a small diameter portion provided with an external electrode and a crease for increasing a creepage distance.

In the display fluorescent lamp according to the sixth invention, the external electrode is a conductive paste formed by printing on the outer peripheral surface of the cylindrical container.

In a display fluorescent lamp according to a seventh aspect of the present invention, the external electrodes extend to the outer surface of the small diameter portion of the cylindrical container.

A display fluorescent lamp according to an eighth aspect of the present invention is one in which an insulating film is formed on an outer surface other than a drive signal supply portion of an external electrode.

In the display fluorescent lamp according to the ninth aspect, the boundary between the large-diameter portion and the small-diameter portion of the cylindrical container has an arc shape or a slope shape.

The display fluorescent lamp according to the tenth aspect of the present invention comprises:
The external electrode is made of a cylindrical conductive material, and this is inserted into the outside of the cylindrical container.

The display fluorescent lamp according to the eleventh aspect of the present invention comprises:
A wavelength selective transmissive filter cap is provided outside the light output section.

The display fluorescent lamp according to the twelfth aspect is
The filter cap is a neutral density filter.

A display fluorescent lamp according to a thirteenth aspect of the present invention comprises:
The filter cap is a color filter.

A display fluorescent lamp according to a fourteenth aspect of the present invention comprises:
The filter cap is made of silicone rubber.

A display fluorescent lamp according to a fifteenth aspect of the present invention comprises:
The light output section has a flat plate shape.

A display fluorescent lamp according to a sixteenth aspect of the present invention comprises:
The flat plate-shaped light output section is a member separate from the cylindrical portion of the cylindrical container, and is made of a dielectric material having a softening point higher than the softening point of the dielectric material forming the cylindrical portion.

A display fluorescent lamp according to a seventeenth aspect of the present invention comprises:
The dielectric constituting the light output portion having a flat plate shape is soda lime glass, and the dielectric constituting the cylindrical portion is formed of lead glass.

A display fluorescent lamp according to an eighteenth aspect of the present invention comprises:
The dielectric material constituting the light output section having a flat plate shape has wavelength selective transmission.

The display fluorescent lamp according to the nineteenth aspect of the present invention comprises:
The dielectric material constituting the light output section having a flat plate shape is a neutral density filter.

The display fluorescent lamp according to the twentieth aspect of the present invention comprises:
The dielectric constituting the light output section having a flat plate shape is used as a color filter.

The display fluorescent lamp according to the twenty-first aspect is
A plurality of minute hemispherical projections are provided on the outer surface of the light output section having a flat plate shape.

A display fluorescent lamp according to a twenty-second aspect of the present invention
It has a ring shape provided concentrically on the outer surface of the light output
And those having a plurality of projections.

The display fluorescent lamp according to the twenty-third aspect of the present invention comprises:
A second external electrode is provided on the outer surface of the small diameter portion of the cylindrical container.

A display fluorescent lamp according to a twenty-fourth aspect of the present invention comprises:
The position of the second external electrode is such that it does not overlap with the phosphor layer extending to the connection between the small diameter portion and the large diameter portion of the cylindrical container.

A display fluorescent lamp according to a twenty-fifth aspect of the present invention is
A dielectric coating is applied to a portion of the internal electrode corresponding to the position of the second external electrode.

The display device according to the twenty-sixth aspect is the display device according to the first aspect.
A plurality of display fluorescent lamps according to any one of claims to 25 are arranged in a plane.

The display element according to the twenty-seventh aspect of the present invention is a display element in which fluorescent lamps for display are divided into three types: a red light emitting lamp, a green light emitting lamp, and a blue light emitting lamp.

The display element according to the twenty-eighth aspect of the present invention has a red, green,
This is a variation of the length of the external electrode of the blue fluorescent lamp.

A display element according to a twenty-ninth aspect of the present invention is the display element, wherein the display fluorescent lamps are arranged in a matrix, and the external or internal electrodes of the display fluorescent lamp on the same row and the display fluorescent lamp on the same column are arranged. The internal electrodes or the external electrodes of the lamp are connected via connecting members.

In the display element according to the thirtieth aspect, a cylindrical convex portion is provided at a portion facing the fluorescent lamp for display, and the convex portion and a portion excluding the light output portion of the fluorescent lamp for display are common. It is covered with an insulating tube.

A display element according to a thirty-first aspect of the present invention has an adhesive layer interposed between a fluorescent lamp for display and an insulating tube.

A display element according to a thirty-second aspect is one wherein the insulating tube is a heat-shrinkable tube.

In the display element according to the thirty-third aspect, a cylindrical projection for mounting the same is provided on a portion facing the display fluorescent lamp, and the projection and the light output portion of the display fluorescent lamp are connected to each other. It is covered with a common insulating cap.

A display element according to a thirty-fourth aspect of the present invention is one wherein the insulating cap is made of a material having a wavelength selective transmittance.

A display element according to a thirty-fifth aspect of the present invention is one wherein the insulating cap is a neutral density filter.

A display element according to a thirty-sixth aspect uses an insulating cap as a color filter.

A display element according to a thirty-seventh aspect is one wherein the insulating cap is formed of silicone rubber.

A display element according to a thirty-eighth aspect of the present invention has an adhesive layer interposed between an insulating cap and a fluorescent lamp for display.

A display element according to a thirty-ninth aspect is one wherein a projection is formed on the outer surface of a cylindrical projection.

A display element according to a fortieth aspect of the present invention is directed to a display element, wherein a projection is provided on an inner surface of a portion of an insulating tube or an insulating cap which covers the outer surface of a cylindrical projection, and the cylindrical portion corresponding to the projection is provided. A recess is provided on the outer surface of the projection to engage the projection.

The display element according to the forty-first aspect is provided with light shielding means for shielding external light to the light output part of the fluorescent lamp for display.

[0089]

The small-diameter portion of the display fluorescent lamp according to the first aspect of the present invention is constructed such that the internal electrode is inserted into the cylindrical container from the end surface on the small-diameter portion side. A sufficient insulation distance can be secured between the internal electrode and the external electrode.

In the second aspect of the present invention, the phosphor layer extending to the connection portion between the small-diameter portion and the large-diameter portion of the cylindrical container of the display fluorescent lamp enables uniform formation of the phosphor layer.

The length of the external electrode of the fluorescent lamp for display according to the third aspect of the present invention makes it possible to reduce power consumption.

The external electrodes of the fluorescent lamp for display according to the fourth aspect of the present invention are formed near the bottom of the cylindrical container opposite to the light output portion on the large-diameter portion side, thereby enabling high luminance.

The folds in the fifth invention improve the withstand voltage without changing the size of the display fluorescent lamp.

The conductive paste of the fluorescent lamp for display according to the sixth aspect of the present invention enables the external electrodes to be formed on the outer surface of the cylindrical container in a continuous and uniform thickness by printing.

The external electrodes of the fluorescent lamp for display according to the seventh aspect of the present invention also extend to the outer surface of the small diameter portion of the cylindrical container,
The connection of the lead wire to the external electrode is enabled at the small-diameter portion, and the connection portion is accommodated in the extended cylindrical surface of the cylindrical container, thereby enabling the high-density arrangement of the display fluorescent lamp.

In the case where the insulating film of the display fluorescent lamp according to the eighth invention is a display element formed by arranging a plurality of display fluorescent lamps adjacent to each other, a short circuit between the external electrodes is formed on the external electrodes. This is prevented by the insulating film.

The display fluorescent lamp according to the ninth aspect,
By making the boundary between the large-diameter portion and the small-diameter portion of the cylindrical container not arc-shaped but arc-shaped or slope-shaped, the printing operation of the conductive paste for the external electrode to be formed on the outer surface of the cylindrical container is facilitated. .

In the tenth aspect of the present invention, a cylindrical conductive material formed in a predetermined shape and size by sheet metal molding of a display fluorescent lamp in the tenth invention is simply inserted into the outer surface of the cylindrical container.
It enables integration of external electrodes into a cylindrical container.

In the eleventh invention, the filter cap having a wavelength selective transmittance attached to the light output portion of the cylindrical container of the display fluorescent lamp functions to attenuate the increase in dark luminance due to reflection on the phosphor layer. I do.

In the twelfth aspect of the present invention, the neutral density filter of the filter cap of the light output section of the display fluorescent lamp obtains a constant light transmission characteristic over the entire visible light range and suppresses an increase in dark luminance of the phosphor. .

The color filter of the filter cap of the light output section of the display fluorescent lamp according to the thirteenth invention is:
A transmittance corresponding to the wavelength of visible light generated by the phosphor is obtained, and an increase in dark luminance due to reflection on the phosphor is suppressed.

The silicone rubber of the filter cap of the display fluorescent lamp according to the fourteenth aspect of the present invention can improve the durability.

The flat shape of the light output section of the fluorescent lamp for display according to the fifteenth aspect allows a large aperture ratio.

The dielectric having a softening point higher than the softening point of the dielectric constituting the cylindrical portion of the display fluorescent lamp according to the sixteenth aspect facilitates the formation of the cylindrical container.

In the seventeenth aspect of the present invention, the dielectric soda lime glass forming the flat light output portion of the display fluorescent lamp and the dielectric lead glass forming the cylindrical portion are:
The light output portion and the cylindrical portion are easily fused together.

In the display fluorescent lamp according to the eighteenth aspect of the present invention, the dielectric material constituting the light output portion having a flat plate shape has wavelength selective transmittance, thereby increasing the increase in dark luminance based on reflection on the fluorescent material layer. Make attenuation possible.

In the display fluorescent lamp according to the nineteenth aspect, the dielectric material constituting the light output section having a flat plate shape is a neutral density filter to obtain a constant light transmission characteristic over the entire visible light range. Suppresses an increase in dark luminance in the phosphor.

In the display fluorescent lamp according to the twentieth aspect of the present invention, the transmittance corresponding to the wavelength of visible light generated by the phosphor is obtained by using a color filter for the dielectric constituting the light output portion having a flat plate shape. Thus, an increase in dark luminance due to reflection on the phosphor is suppressed.

In the display fluorescent lamp according to the twenty-first aspect, by providing a plurality of minute hemispherical projections on the outer surface of the light output portion having a flat plate shape, the reflection of external light at the light output portion is suppressed and the darkness is reduced. Suppress increase in brightness.

The fluorescent lamp for display according to the twenty-second aspect of the present invention.
It has a ring shape provided concentrically on the outer surface of the light output
In addition, the one provided with the plurality of protrusions suppresses reflection of external light at the light output unit and reduces an increase in dark luminance.

The second external electrode provided on the outer surface of the small-diameter portion of the cylindrical container of the display fluorescent lamp according to the twenty-third aspect stabilizes discharge control.

In the display fluorescent lamp according to the twenty-fourth aspect, the position of the second external electrode is such that the position does not overlap with the fluorescent layer extending to the connection between the small-diameter portion and the large-diameter portion of the cylindrical container. By doing so, it is possible to suppress the phosphor from emitting light due to the discharge at the second external electrode, and to reduce an increase in dark luminance.

In the display fluorescent lamp according to the twenty-fifth aspect, the electric power consumed by the discharge at the second external electrode is achieved by applying a dielectric coating to the portion of the internal electrode corresponding to the position of the second external electrode. Suppress.

In the twenty-sixth aspect, the high-density planar arrangement of the display fluorescent lamps having a small outer diameter of the display element enables high-resolution image display.

In the twenty-seventh aspect, the plurality of red light emitting lamps, green light emitting lamps, and blue light emitting lamps arranged in a predetermined relationship with the display element can display a high-resolution color image.

In the twenty-eighth aspect, the display fluorescent lamp in which the lengths of the external electrodes of the display element are different between the red light emitting lamp, the green light emitting lamp, and the blue light emitting lamp is a red light emitting lamp, a green light emitting lamp. And control of the luminance ratio of the blue light emitting lamp.

The display element according to the twenty-ninth aspect is characterized in that the external electrodes or the internal electrodes of a plurality of display fluorescent lamps in the same row or column arranged in a matrix are connected to each other via a connecting member, thereby providing a signal. The number of wires used can be reduced.

In the display element according to the thirtieth aspect, a short circuit between the external electrodes of the display fluorescent lamps is prevented by covering both the display fluorescent lamp and the projection for attaching the display fluorescent lamp with an insulating tube.

In the display element according to the thirty-first aspect, the insulating tube is securely attached to the display fluorescent lamp by the adhesive interposed therebetween.

In the display element according to the thirty-second aspect, the display fluorescent lamp and the projection are covered with a heat-shrinkable tube and heated, so that the heat-shrinkable tube itself shrinks the heat-shrinkable tube to form the display fluorescent lamp. It can be fixed to the outer surface to provide insulation protection between the external electrodes.

In the display element according to the thirty-third aspect, the entirety of the display fluorescent lamp can be made waterproof by covering the cylindrical projection and the display fluorescent lamp with a common insulating cap.

The display element according to the thirty-fourth aspect uses an insulating cap made of a material having wavelength selective transmittance, thereby avoiding the inconvenience of preparing a filter cap or the like as a separate member.

In the display element according to the thirty-fifth aspect, the insulating cap is a neutral density filter, which has a constant transmittance over the entire visible light range, and has a dark luminance based on the reflection on the phosphor layer. Try to suppress the rise.

In the display element according to the thirty-sixth aspect, by using a color filter as the insulating cap, transmittance characteristics corresponding to the wavelength of visible light can be obtained, and an increase in dark luminance due to reflection on the phosphor layer can be suppressed. To do.

In the display element according to the thirty-seventh aspect, durability and weather resistance are improved by forming the insulating cap with silicone rubber.

In the display element according to the thirty-eighth aspect, the insulating cap and the fluorescent lamp for display are fixed with an adhesive to reliably prevent the insulating cap from falling off from each fluorescent lamp for display.

According to the display element of the thirty-ninth aspect, the projection provided on the outer surface of the cylindrical projection prevents the insulating cap from falling off to the projection and stabilizes the mounting state.

In the display element according to the fortieth aspect, the projection provided on the insulating cap or the insulating tube can be fitted into the concave portion provided on the cylindrical projection, so that the mutual fitting can be achieved. And stabilization of the fitted state can be achieved at the same time.

In the display element according to the forty-first aspect, the high-intensity external light such as sunlight is prevented from directly entering the fluorescent lamp for display by the light shielding means, and the increase in the dark luminance of the fluorescent lamp due to the irradiation is prevented. Avoidance beforehand and make a bright display image visible.

[0130]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a fluorescent lamp for display of the present invention, and 2 denotes a cylindrical container constituting the fluorescent lamp 1 for display. Here, a glass bulb as a cylindrical container having portions having different diameters in an axial direction. is there. Here, 2a is a large diameter portion of the glass bulb 2, and 2b is a small diameter portion of the glass bulb 2.

Reference numeral 3 denotes an internal electrode inserted into the glass bulb 2 from the end face of the small-diameter portion 2b side of the glass bulb 2; 4 denotes an external electrode provided on the outer surface of the large-diameter portion 2a of the glass bulb 2; Is a phosphor layer formed on the inner surface and the inner lower end surface of the large diameter portion 2a of the glass bulb 2.

Further, reference numeral 8 denotes a large diameter portion 2a of the glass bulb 2.
Is a light-transmitting light output unit provided at the upper end (the left end in the figure). Further, the internal electrode 3 and the external electrode 4 are connected to a power source 6 by lead wires 5a and 5b.

Next, the operation will be described. Now power 6
When a voltage is applied between the internal electrode 3 and the external electrode 4 from
A voltage is applied to the rare gas in the display fluorescent lamp 1 via glass, which is a dielectric, to cause discharge. The ultraviolet light generated at that time excites the phosphor layer 7 and is converted into a specific visible light determined by the phosphor.

Since the phosphor itself is white,
Visible light generated from this phosphor is almost totally reflected by the phosphor layer 7 formed on the inner surface of the large diameter portion 2a of the glass bulb 2 and returns to the inside of the glass bulb 2, but this visible light is transparent. Are output and radiated to the outside of the glass bulb 2 from the light output unit 8 having

By the way, the voltage applied between the internal electrode 3 and the external electrode 4 is about 200 V to 2000 V, depending on the type of rare gas to be sealed and the sealing pressure. For example, the diameter of the large diameter portion 2a of the glass bulb 2 is 6.45 m.
m, when the rare gas xenon is 200 Torr, a voltage of about 600 V or more is required, and the insulation distance required for this is, for example, IEC380.
When the standard is applied, the creepage distance is 5.6 mm
Need more.

In the conventional fluorescent lamp 1 for display, the creepage distance between the internal electrode 3 and the external electrode 4 cannot be more than half the diameter of the glass bulb 2, When a diameter of 6.45 mm was used as 2, a creepage distance of only about 3 mm was obtained.

On the other hand, the display fluorescent lamp 1 according to the present invention.
In the case of (1), the diameter of the small diameter portion 2b of the glass bulb 2 is 2.
When the length is 4 mm, the creepage distance of about 6 mm or more can be obtained if the length of the small diameter portion 2b is about 4 mm or more.

Further, even when the type of the rare gas to be charged, the charging pressure, and the like are changed and the applied voltage is higher than that in the above example, it is necessary to make the length of the small diameter portion 2b appropriate. The creepage distance can be obtained and the internal electrode 3
And the external electrode 4 can be sufficiently electrically insulated.

The external electrodes 4 can be efficiently and easily formed by printing a conductive paste on the outer surface of the glass bulb 2 using a printing technique such as screen printing.

Embodiment 2 FIG. FIG. 2 shows another embodiment of the present invention. In this embodiment, the phosphor layer 7 is provided with the small diameter portion 2 of the glass bulb 2.
The case where it is extended to b is shown. In this configuration, the fluorescent layer 7 is formed by the large diameter portion 2a and the small diameter portion 2 of the glass bulb 2.
It is possible to easily form a uniform phosphor layer 7 without requiring high-precision control of controlling at the boundary with b.
Reference numeral 99 denotes "folds" or "wrinkles" provided on the outer surface of the small-diameter portion, whereby the creepage distance can be increased. The folds may be plural, and may be made of another material and attached to the small diameter portion instead of the material constituting the small diameter portion as shown in FIG.

Embodiment 3 FIG. FIG. 3 shows another embodiment of the present invention, in which the length of the external electrode 4 is shorter than the length of the large diameter portion 2a of the glass bulb 2 in the axial direction. When the power consumed by the display fluorescent lamp 1 is measured using the length of the external electrode 4 as a parameter, the power consumption increases as the length of the external electrode 4 increases. This is shown as an example in FIG. Therefore, if the length of the external electrode 4 is made equal to the axial length of the large-diameter portion 2a of the glass bulb 2 as in the conventional example, excessive power will be consumed. On the other hand, the length of the external electrode 4 is set to the large diameter portion 2 of the glass bulb 2.
By making the length a shorter than the length in the axial direction, the value of the power consumption of the display fluorescent lamp 1 can be suppressed to an appropriate value.

FIG. 5 shows the result of measuring the light emission luminance of the display fluorescent lamp 1 using the length of the external electrode 4 as a parameter. As shown in FIG. 5, it has been found that the light emission luminance of the display fluorescent lamp 1 increases as the length of the external electrode 4 increases. On the other hand, when a color display element is formed by combining a red light-emitting lamp, a green light-emitting lamp, and a blue light-emitting lamp, an appropriate luminance for the red light-emitting lamp, the green light-emitting lamp, and the blue light-emitting lamp due to the problem of color reproduction. A luminance ratio is required. As a means for realizing this, it is conceivable to make the value of the voltage applied between the internal electrode 3 and the external electrode 4 different between the red light emitting lamp, the green light emitting lamp, and the blue light emitting lamp. It is necessary to prepare a power supply. On the other hand, if the length of the external electrode 4 of the display fluorescent lamp 1 used as a red light-emitting lamp, a green light-emitting lamp, and a blue light-emitting lamp is made different using the characteristics shown in FIG. In addition, the emission luminance of the display fluorescent lamp 1 used as the green light emitting lamp and the blue light emitting lamp can be easily adjusted, and the required luminance ratio can be easily realized.

Embodiment 4 FIG. FIG. 6 shows another embodiment of the present invention, in which an external electrode 4 whose length is shorter than the axial length of the large-diameter portion 2a of the glass bulb 2 is provided near the lower end surface of the large-diameter portion 2a of the glass bulb 2. The case where it was formed is shown. When the length of the external electrode 4 is shorter than the length of the large diameter portion 2a of the glass bulb 2 in the axial direction, there is a problem in which part of the large diameter portion 2a of the glass bulb 2 to form the external electrode 4. .
Then, when the light emission luminance of the display fluorescent lamp 1 was measured using the formation position of the external electrode 4 as a parameter, the result shown in FIG. 7 was obtained. That is, it has been found that the emission luminance of the display fluorescent lamp 1 can be increased by forming the external electrode 4 near the lower end surface of the large diameter portion 2a of the glass bulb 2. This is considered because the light emission of the phosphor layer formed on the lower end surface greatly contributes to the light emission luminance of the display fluorescent lamp 1. Therefore, by forming the external electrode 4 near the lower end surface of the large diameter portion 2a of the glass bulb 2, the display fluorescent lamp 1 with high brightness can be obtained.

Embodiment 5 FIG. FIG. 8 shows another embodiment of the present invention, in which the external electrode 4 is connected to the small-diameter portion 2 of the glass bulb 2.
The case where it is extended to b is shown. In this configuration, the space required for connecting the lead wire 5b and the external electrode 4 can be pressed into the extended cylindrical surface of the large-diameter portion 2a of the glass bulb 2, so that the connection portion of the lead wire 5b The outer diameter is not increased unnecessarily, and as a result, the high-density arrangement of the display fluorescent lamps 1 becomes possible.

Embodiment 6 FIG. FIG. 9 shows another embodiment of the present invention, in which the external electrode 4 is connected to the small-diameter portion 2 of the glass bulb 2.
The case where it is extended to a part of b is shown. In this case, as in the case of the fifth embodiment, the connection space of the lead wire can be pressed into the extended cylindrical surface of the large diameter portion 2a of the glass bulb 2, and the display fluorescent lamp 1 can be arranged at a high density. to enable.

Embodiment 7 FIG. FIG. 10 shows another embodiment of the present invention, in which a case where an insulating film 9 is formed in a portion other than the drive signal supply portion of the external electrode 4 is shown. According to this embodiment, when a display element is configured by arranging a plurality of display fluorescent lamps 1, an effect is obtained that a short circuit between adjacent external electrodes 4 can be prevented.

Embodiment 8 FIG. FIG. 11 shows another embodiment of the present invention. In this case, when the external electrode 4 is extended to a part of the small-diameter portion 2b of the glass bulb 2, an insulating film is formed on a portion other than the drive signal supply portion of the external electrode 4. 9 shows an example in which 9 is formed. In this embodiment, similarly to the above, the display fluorescent lamps 1 can be arranged at a high density, and a short circuit between the external electrodes 4 of the adjacent display fluorescent lamps 1 can be prevented.

Embodiment 9 FIG. FIG. 12 shows another embodiment of the present invention, in which the boundary portion between the large diameter portion 2a and the small diameter portion 2b of the glass bulb 2 is formed in an arc shape. According to this embodiment, the external electrode 4 is formed by printing a conductive paste from the large diameter portion 2a of the glass bulb 2 to the small diameter portion 2b.
In the case of extending and forming up to this point, there is obtained an advantage that the printing operation can be performed continuously and easily via the arcuate portion 2c, and the formation of the insulating film 9 becomes easy.

Embodiment 10 FIG. FIG. 13 shows another embodiment of the present invention, in which a portion (boundary portion) connecting the large diameter portion 2a and the small diameter portion 2b of the glass bulb 2 has a slope shape. Also in this embodiment, the large-diameter portion 2
The conductor paste for the external electrode 4 and the insulating film 9 can be formed continuously, easily, and quickly by printing or the like through the slope-shaped portion 2d on the small diameter portion 2b and the portion a.

Embodiment 11 FIG. FIG. 14 shows another embodiment of the present invention, in which the external electrode 4 is made of, for example, a cylindrical conductor material 10 as shown in FIG. This shows a case where the structure is to be inserted. In this embodiment, a cylindrical body of the conductor material 10 is formed by cutting out a plate material by pressing or the like, and a connecting piece 10a for connecting to the lead wire 5b is bent toward the center.

Therefore, according to this embodiment, the steps of printing, drying, and baking, which are required when the conductive paste is formed by printing, can be omitted, and the advantage that the assembling efficiency is improved can be obtained.

Embodiment 12 FIG. FIG. 16 shows another embodiment of the present invention, in which a filter cap 11 having wavelength selective transmittance is provided in the light output section 8 of the glass bulb 2. According to this embodiment, the increase in the dark luminance caused by the external light entering the glass bulb 2 from the light output unit 8 being reflected by the phosphor layer 7 and being emitted from the light output unit 8 again is determined by the external light Is suppressed by being attenuated by two times of filtering at the time of incidence and at the time of emission, and as a result, a displayed image can have high contrast.

The filter cap 11 having the above-mentioned wavelength selective transmittance may be constituted by a neutral density filter having a constant transmittance over the entire visible light range. By obtaining a constant light transmission characteristic over the entire area, it is possible to effectively suppress an increase in dark luminance due to reflection on the phosphor. Further, the filter cap 11 may be constituted by a color filter having a transmittance characteristic corresponding to the wavelength of visible light generated by the phosphor, and the effect of improving the contrast can be obtained. In addition, when the filter cap 11 is made of silicone rubber, the weather resistance can be improved.

Embodiment 13 FIG. FIG. 17 shows another embodiment of the present invention, in which the light output section 8 of the glass bulb 2 is formed in a flat plate shape. When the light output portion 8 has a hemispherical shape, the light generated in the phosphor layer formed on the lower end surface of the large diameter portion 2a of the glass bulb 2 greatly contributes to the emission luminance of the display fluorescent lamp 1. As shown in FIG. 18, the light output portion 8 can be extracted from the front surface of the display fluorescent lamp 1 only in an area smaller than the inner diameter area of the large diameter portion 2a of the glass bulb 2 due to the concave lens effect. On the other hand, when the light output section 8 has a flat plate shape, the light generated in the phosphor layer formed on the lower end surface of the large diameter portion 2a of the glass bulb 2 as shown in FIG. The glass bulb 2 can be taken out to the front of the display fluorescent lamp 1 by the inner diameter area of the large diameter portion 2a. Therefore, when the light output section 8 is formed in a flat plate shape, the light emission area (aperture ratio as a display element) when the display fluorescent lamp 1 is viewed from the front can be increased. 18 and 19, the influence of the small diameter portion 2b is neglected from the viewpoint of simplicity of the simulation.

Further, the light output portion 8 having a flat plate shape is formed separately from the large diameter portion 2 a of the glass bulb 2,
The glass bulb 2 can be easily formed by using a glass having a softening point higher than the softening point of the glass used for the large diameter portion 2a.

As an example, the light output portion 8 is made of soda lime glass and the large diameter portion 2a of the glass bulb 2 is made of lead glass.
f can be easily fused.

Further, since the light output section 8 of the glass bulb 2 is made of glass having a wavelength selective transmittance, external light entering the glass bulb 2 from the light output section 8 is reflected by the phosphor layer 7. Then, an increase in dark luminance caused by the light emitted from the light output unit 8 again is suppressed by attenuating the external light by two times of filtering when the external light is incident and when the external light is emitted. The contrast can be improved.

The light output section 8 having the above-mentioned wavelength selective transmittance may be constituted by a neutral density filter having a constant transmittance over the entire visible light range.
In this case, by obtaining a constant light transmission characteristic over the entire visible light region, it is possible to effectively suppress an increase in dark luminance due to reflection on the phosphor. Further, the light output section 8 may be constituted by a color filter having a transmittance characteristic corresponding to the wavelength of visible light generated by the phosphor, and the effect of improving the contrast can be obtained.

Embodiment 14 FIG. FIG. 20 shows another embodiment of the present invention, in which a plurality of minute hemispherical projections 8a are provided on the outer surface of the light output section 8. According to this embodiment, external light incident on the light output unit 8 is scattered by the minute hemispherical projections 8a, so that reflection of the external light on the light output unit 8 having a flat plate shape can be prevented. .

Embodiment 15 FIG. FIG. 21 shows another embodiment of the present invention. In this embodiment, a plurality of semi-cylindrical shapes (the cylinder is cut vertically, and
The projection 8b of the shape) as the al face was on the lower side shows a case of providing concentrically <br/>. That is, on the outer surface of the light output unit 8,
A plurality of ring-shaped projections 8b provided concentrically
Is provided. In this case as well, it is possible to prevent external light from being reflected on the light output section 8 having a flat shape.

Embodiment 16 FIG. FIG. 22 shows another embodiment of the present invention, in which the second external electrode 12 is provided on the outer surface of the small diameter portion 2b of the glass bulb 2. In this case, due to the presence of space charges generated by a discharge (auxiliary discharge) generated by applying a voltage between the internal electrode 3 and the second external electrode 12, the internal electrode 3 and the external electrode 4
(Main discharge) can be easily generated.

In general, the voltage required to start discharge is a function of the product pd of the gas pressure p in the discharge space and the gap length d in the discharge space according to Paschen's law, and may have a minimum value at a certain value of pd. Are known. In a normal discharge lamp, the pd product is set to be larger than the pd value that gives this minimum value. When the gas pressure is constant, the longer the gap length, the higher the voltage required to start discharge. .

Therefore, the discharge between the internal electrode 3 and the external electrode 4 requires a higher voltage for the start of the discharge than the discharge between the internal electrode 3 and the second external electrode 12. Therefore, even if a voltage for causing a discharge between the internal electrode 3 and the second external electrode 12 is applied, no discharge occurs between the internal electrode 3 and the external electrode 4. On the other hand, when a predetermined voltage required for starting the discharge between the internal electrode 3 and the external electrode 4 is applied between the internal electrode 3 and the external electrode 4, the space charge generated by the auxiliary discharge causes In addition, a discharge can be stably started with a lower voltage than when there is no space charge.

The position at which the second external electrode 12 is provided is such that it does not overlap with the phosphor layer extended to the small diameter portion 2b of the glass bulb 2 as shown in FIG. The display fluorescent lamp 1 can be prevented from emitting light due to a discharge between the display and the second external electrode 12.

Embodiment 17 FIG. FIG. 23 shows another embodiment of the present invention, in which a glass coating 13 is applied to a portion of the internal electrode 3 corresponding to the position of the second external electrode 12. In this case, as shown in FIG. 24, the power consumed by the auxiliary discharge can be reduced.

Embodiment 18 FIG. FIG. 25 shows another embodiment of the present invention, in which a display element 21 is constructed by arranging a plurality of display fluorescent lamps 1 as shown in FIGS. The following shows the case.

According to this embodiment, the outer diameter of the large-diameter portion 2a can be made as small as possible by providing the small-diameter portion 2b capable of extending the insulation distance in the glass bulb 2, and thereby,
A display element capable of forming a high-resolution large-size image display device can be configured.

Embodiment 19 FIG. FIG. 26 shows another embodiment of the present invention, in which the display fluorescent lamp 1 is a red light emitting lamp 1R, a green light emitting lamp 1G, and a blue light emitting lamp 1.
B shows a case where the display element 21 is configured by arranging the display element 21 on the base member 22 in a certain order in three types of B. According to this embodiment, the lamps 1 R, 1 G, 1
By lighting B at various ratios, various luminescent colors can be reproduced, and thus a high-resolution color image display device can be configured.

Embodiment 20 FIG. FIG. 27 shows a fluorescent lamp 1 for display.
Are arranged in a matrix, and the display fluorescent lamps 1 on the same row are arranged.
FIG. 3 is a schematic diagram when a display element is formed by connecting the external electrodes 4 and the internal electrodes 3 of the display fluorescent lamp of the same example.

Here, a connecting member 23 for connecting the external electrodes 4 and a connecting member 24 for connecting the internal electrodes 3 are provided.
With this configuration, an interface between the display element 21 and an external display element driving circuit (not shown) can be realized by 4 + 4 = 8 signal lines.

In the drawing, the display fluorescent lamp 1 on the same row is shown.
External electrodes 4 and display fluorescent lamps 1 in the same row
Of the display element 21 by connecting the internal electrodes 3 of the display fluorescent lamp 1 in the same row, and connecting the external electrodes 4 of the display fluorescent lamp 1 in the same column to each other. The same effect can be obtained even if the display element 21 is configured by connection.

Embodiment 21 FIG. FIG. 28 shows a portion of the display element 21 opposite to the display fluorescent lamp 1 on the base member 22.
A cylindrical projection 25 for mounting the display fluorescent lamp 1 as shown in FIG. 29 is provided, and the projection 25 and a portion other than the light output section 8 of the display fluorescent lamp 1 are shown in FIG. In this manner, the display element 21 is covered with the common insulating tube 26.

In this embodiment, the small-diameter portion 2b of the glass bulb 2 is inserted into the center hole 25a of the projection 25, and the large-diameter portion 2b is inserted.
a, the display fluorescent lamp 1 and the convex portion 25 are simultaneously covered with the insulating tube 26 after the lower surface of the a is opposed to the upper surface of the convex portion 25, so that the short circuit between the external electrodes 4 of the adjacent display fluorescent lamps 1 is achieved. Prevention can be made more reliable.
Here, the external electrodes 4 and the like are omitted.

Embodiment 22 FIG. FIG. 31 shows another embodiment of the present invention, in which an adhesive layer 27 is provided on the inner surface of an insulating tube 26. According to this embodiment, the display fluorescent lamp 1, the cylindrical projection 25 and the insulating tube 2 are provided.
6 can be improved in adhesion. Further, by using the heat-shrinkable tube as the insulating tube 26, the above-mentioned adhesion after heat-shrinkage can be further improved.

Embodiment 23 FIG. FIG. 32 shows a portion of the display element 21 opposite to the display fluorescent lamp 1 on the base member 22.
29 shows an embodiment in which a cylindrical convex portion 25 as shown in FIG. 29 is provided, and the convex portion 25 and the light output portion 8 of the display fluorescent lamp 1 are covered with a common insulating cap 28.

According to this embodiment, the fluorescent lamp for display 1
In addition, since the insulating cap 28 is made of a material having a wavelength selective transmittance, there is no need to prepare a filter cap as a separate member. Further, by forming the insulating cap 28 from silicone rubber, there is obtained an advantage that weather resistance is improved.

The insulating cap 28 may be constituted by a neutral density filter having a constant transmittance over the entire visible light range, and has a transmittance characteristic corresponding to the wavelength of the visible light generated by the phosphor. You may comprise by a color filter. Thereby, it is possible to suppress an increase in dark luminance due to the reflection of the phosphor.

Embodiment 24 FIG. FIG. 33 shows another embodiment of the present invention, in which an adhesive layer 29 is provided on the inner surface of an insulating cap 28. According to this embodiment, the fluorescent lamp 1 for display, the cylindrical projection 25 and the insulating cap 2 are used.
8 can be further improved.

Embodiment 25 FIG. FIG. 34 shows another embodiment of the present invention. In this embodiment, a projection 30 is provided on a circumferential surface of a cylindrical projection 25 projecting from a base member 22 of a display element 21.
Is shown. In this embodiment, the insulating cap 28
Is inserted so as to cover the display fluorescent lamp 1,
The lower portion of the insulating cap 28 fits tightly into the cylindrical projection 25, so that it is possible to prevent the insulating cap 28 from easily coming off from the cylindrical projection 25. Here, the insulating cap 2
8, the same effect can be obtained by providing the protruding portion 30 also in the case of the insulating tube 26 as shown in FIG. 28, FIG. 30, and FIG.

Embodiment 26 FIG. FIG. 35 shows another embodiment of the present invention, in which the cylindrical convex portion 2 of the insulating cap 28 is shown.
5 shows a case in which a projection 31 is provided on the inner surface of a portion covering 5 and a recess 32 is provided on the peripheral surface of a cylindrical projection 25 corresponding to the projection 31.

According to this embodiment, there is obtained an advantage that the fitting of the projection 31 and the recess 32 can more securely prevent the insulating cap 28 from coming off the cylindrical projection 25. Although the figure shows the case of the insulating cap 28, the projecting portions 31 may be used in the case of the insulating tube 26 as shown in FIGS. 28, 30, and 31.
By providing the recesses 32, the same effect as described above can be obtained.

Embodiment 27 FIG. FIGS. 36, 37, and 38 show another embodiment of the present invention. In this embodiment, when the external light is directly applied to the light output section 8 of the display fluorescent lamp 1 with respect to the display element 21. The case where the light shielding means 33 is provided so as not to be shown. The light shielding means 33 is provided between each row of the plurality of rows of display fluorescent lamps 1 arranged in a row, and each light shielding plate 34 for blocking direct sunlight from above or obliquely above.
Are arranged. Accordingly, reflection of the display fluorescent lamp 1 from the phosphor can be suppressed to suppress an increase in dark luminance, and a high contrast of a display image can be realized.

In the eighteenth to twenty-seventh embodiments, 4 ×
An example in which one display element is configured using 4 = 16 display fluorescent lamps has been described, but the number of display fluorescent lamps configuring one display element is not limited to this.

[0184]

As described above, according to the first aspect of the present invention, the axial length of the small diameter portion of the cylindrical container is controlled by the insulation required for the voltage applied between the internal electrode and the external electrode. Since it is configured to be larger than the distance, there is an effect that a sufficient insulating distance can be provided between the internal electrode and the external electrode even if the diameter of the glass bulb is reduced.

According to the second aspect of the present invention, since the phosphor layer is formed so as to extend to the connecting portion between the small-diameter portion and the large-diameter portion of the cylindrical container, the phosphor layer can be formed uniformly. There is.

According to the third aspect, the length of the external electrode is
Since the configuration is made shorter than the axial length of the large-diameter portion of the cylindrical container, the power consumption can be reduced.

According to the fourth aspect, since the external electrode is formed near the bottom on the side opposite to the light output section on the large diameter side of the cylindrical container, an effect of obtaining high luminance can be obtained. is there.

According to the fifth aspect, the creeping distance between the internal electrode and the external electrode can be increased without increasing the length of the fluorescent lamp.

According to the sixth aspect, since the external electrodes are formed of the conductive paste formed on the outer peripheral surface of the cylindrical container by printing, the external electrodes can be formed continuously and with a uniform thickness. effective.

According to the seventh aspect, since the external electrode is configured to extend to the outer surface of the small-diameter portion of the cylindrical container, the space for connecting the lead wire to the external electrode is reduced by the extended cylindrical surface of the cylindrical container. There is an effect that can be held down inside.

According to the eighth aspect, since the insulating film is formed on the outer surface other than the drive signal supply portion of the external electrode, there is an effect that adjacent external electrodes can be prevented from being short-circuited.

According to the ninth aspect, since the boundary between the large-diameter portion and the small-diameter portion of the cylindrical container is formed in an arc shape or a slope shape, the printing operation of the external electrodes on the cylindrical container is facilitated. There is an effect that can be done.

According to the tenth aspect, since the external electrode is formed of a cylindrical conductive material and is inserted into the outside of the cylindrical container, a complicated process in printing or the like is eliminated. There is an effect that the external electrode can be easily formed only by fitting the cylindrical conductive material formed in advance into the cylindrical container.

According to the eleventh aspect, since the filter cap having the wavelength selective transmission is provided outside the light output portion, there is an effect of suppressing an increase in dark luminance due to reflection on the phosphor.

According to the twelfth aspect, since the filter cap is configured as a neutral density filter, the light transmittance can be made constant over the entire visible light range, and the dark luminance based on the reflection from the phosphor can be reduced. This has the effect of suppressing the rise.

According to the thirteenth aspect, since the filter cap is configured to be a color filter, an increase in dark luminance based on reflection on the phosphor layer is made using light transmission characteristics corresponding to the wavelength of visible light. Has the effect of suppressing

According to the fourteenth aspect, since the filter cap is made of silicone rubber, there is an effect that the durability of the filter cap can be improved.

According to the fifteenth aspect, since the light output portion is configured to have a flat plate shape, the aperture ratio can be increased.

According to the sixteenth aspect, the light output portion having a flat plate shape is formed separately from the cylindrical portion of the cylindrical container, and the dielectric member having a softening point higher than the softening point of the dielectric constituting the cylindrical portion is provided. Since it is constituted by the body, there is an effect that the formation of the cylindrical container can be facilitated.

According to the seventeenth aspect, since the dielectric constituting the light output portion in the form of a flat plate is made of soda lime glass and the dielectric constituting the cylindrical portion is made of lead glass, the light output is reduced. This has the effect of facilitating the fusion between the portion and the cylindrical portion.

According to the eighteenth aspect, since the dielectric constituting the light output portion having a flat plate shape is configured to have wavelength selective transmittance, even when the light output portion having a flat plate shape is used, This has the effect of suppressing an increase in dark luminance due to reflection on the phosphor layer.

According to the nineteenth aspect, since the dielectric constituting the light output section having a flat plate shape is configured as a neutral density filter, even when the light output section having a flat plate shape is used, visible light can be obtained. By making the light transmittance constant over the entire region, there is an effect that the increase in dark luminance can be suppressed.

According to the twentieth aspect, since the dielectric constituting the light output portion having a flat plate shape is configured to be a color filter, even when a light output portion having a flat plate shape is used, visible light can be obtained. There is an effect that an increase in dark luminance can be suppressed by utilizing the light transmission characteristics corresponding to the wavelength.

According to the twenty-first aspect, since a plurality of minute hemispherical projections are provided on the outer surface of the light output section having a flat plate shape, the flat hemispherical projections can be used to form the flat light output section. This has the effect of suppressing the reflection of external light at the output section and suppressing an increase in dark luminance.

According to the twenty-second aspect, on the outer surface of the light output portion,
It has a plurality of concentric ring-shaped protrusions .
Since it is configured so obtain, by the projections of the ring-shaped, the effect capable of suppressing the increase of dark luminance by suppressing reflection of external light in the light output portion.

According to the twenty-third aspect, the second external electrode is provided on the outer surface of the small diameter portion of the cylindrical container.
There is an effect that discharge control can be performed stably.

According to the twenty-fourth aspect, the position of the second external electrode is set so as not to overlap with the phosphor layer extending to the connection between the small-diameter portion and the large-diameter portion of the cylindrical container. Thus, there is an effect that it is possible to suppress the phosphor from emitting light due to the discharge at the second external electrode.

According to the twenty-fifth aspect, since the dielectric coating is applied to the portion of the internal electrode corresponding to the position of the second external electrode, the power consumed by the discharge at the second external electrode Has the effect of being able to suppress

According to the twenty-sixth aspect, since a plurality of small-diameter display fluorescent lamps are arranged side by side in a plane,
By arranging the display fluorescent lamps at high density, there is an effect that a higher resolution of a display image can be obtained.

According to the twenty-seventh aspect, the fluorescent lamps for display are divided into three types, that is, a red light emitting lamp, a green light emitting lamp, and a blue light emitting lamp.
There is an effect that a color image display can be performed using the emission colors of red, green, and blue.

According to the twenty-eighth aspect, since the lengths of the external electrodes are made different for the red light emitting lamp, the green light emitting lamp, and the blue light emitting lamp, the red light emitting lamp and the green light emitting lamp are provided. In addition, the brightness of the blue light emitting lamp can be easily controlled.

According to the twenty-ninth aspect, the display fluorescent lamps are arranged in a matrix, and the external electrodes or internal electrodes of the display fluorescent lamps in the same row and the display fluorescent lamps in the same column are arranged. Since the internal electrodes and the external electrodes are connected to each other via the connecting member, there is an effect that the lighting of each of the plurality of display fluorescent lamps can be selectively controlled with a small number of signal lines.

According to the thirtieth aspect, a cylindrical convex portion is provided at a portion facing the fluorescent lamp for display, and the convex portion and a portion excluding the light output portion of the fluorescent lamp for display are provided with a common insulating tube. The structure is such that short-circuiting between external electrodes of adjacent display fluorescent lamps juxtaposed by insulating tubes can be reliably prevented.

According to the thirty-first aspect, since the adhesive layer is interposed between the display fluorescent lamp and the insulating tube, there is an effect that the insulating tube can be securely fixed to the display fluorescent lamp. .

According to the thirty-second aspect, since the heat-shrinkable tube is used as the insulating tube, the insulating tube can be easily mounted and fixed to the display fluorescent lamp by utilizing the heat-shrinkability of the tube. There is an effect that can be done.

According to the thirty-third aspect, a cylindrical convex portion for mounting the display fluorescent lamp is provided at a portion facing the fluorescent lamp for display, and the convex portion and the light output portion of the fluorescent lamp for display are provided. Are covered with a common insulating cap, so that an insulating cap is juxtaposed and placed over each of the adjacent display fluorescent lamps, thereby reliably preventing a short circuit between the external electrodes, and allowing each display fluorescent lamp to be covered. This has the effect of waterproofing the entire lamp.

According to the thirty-fourth aspect, since the insulating cap is made of a material having a wavelength selective transmittance, even when the insulating cap is used, there is an effect that an increase in dark luminance in the light output section can be suppressed.

According to the thirty-fifth aspect, since the insulating cap is configured as a neutral density filter, even when the insulating cap is used, the light transmittance can be kept constant over the entire visible light range, and the darkness can be reduced. This has the effect of suppressing an increase in luminance.

According to the thirty-sixth aspect, since the insulating cap is configured to be a color filter, even when the insulating cap is used, the dark luminance can be reduced by utilizing the light transmission characteristics corresponding to the wavelength of visible light. This has the effect of suppressing the rise.

According to the thirty-seventh aspect, since the insulating cap is made of silicone rubber, there is an effect that the durability of the insulating cap can be improved.

According to the thirty-eighth aspect, since the adhesive layer is interposed between the insulating cap and the display fluorescent lamp, the insulating cap can be securely removed from the display fluorescent lamp. There is an effect that can be fixed as much as possible.

According to the thirty-ninth aspect, since the projection is formed on the outer surface of the cylindrical projection, there is an effect that the insulating cap can be easily fixed to the cylindrical projection.

According to the fortieth aspect, a projection is provided on the inner surface of a portion of the insulating tube or the insulating cap which covers the outer surface of the cylindrical projection, and the cylindrical projection corresponding to the projection is provided. Is formed on the outer surface thereof so as to be engaged with the above-mentioned projection, so that there is an effect that the fitting of the insulating tube or the insulating cap to the cylindrical projection can be further strengthened.

According to the forty-first aspect, since the light shielding means for shielding external light to the light output section of the display fluorescent lamp is provided, it is possible to prevent the incidence of extraneous light such as sunlight. This has the effect of suppressing an increase in dark luminance due to reflection on the phosphor layer.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a display fluorescent lamp according to Embodiment 1 of the present invention.

FIG. 2 is a longitudinal sectional view showing a display fluorescent lamp according to a second embodiment of the present invention.

FIG. 3 is a vertical sectional view showing a display fluorescent lamp according to Embodiment 3 of the present invention.

FIG. 4 is a graph showing a relationship between external electrode length and power consumption.

FIG. 5 is a graph showing the relationship between the length of an external electrode and the emission luminance.

FIG. 6 is a vertical sectional view showing a display fluorescent lamp according to a fourth embodiment of the present invention.

FIG. 7 is a graph showing a relationship between a position of an external electrode and light emission luminance.

FIG. 8 is a vertical sectional view showing a display fluorescent lamp according to a fifth embodiment of the present invention.

FIG. 9 is a longitudinal sectional view showing a display fluorescent lamp according to a sixth embodiment of the present invention.

FIG. 10 is a longitudinal sectional view showing a display fluorescent lamp according to a seventh embodiment of the present invention.

FIG. 11 is a longitudinal sectional view showing a fluorescent lamp for display according to an eighth embodiment of the present invention.

FIG. 12 is a vertical sectional view showing a display fluorescent lamp according to Embodiment 9 of the present invention.

FIG. 13 is a longitudinal sectional view showing a display fluorescent lamp according to Embodiment 10 of the present invention.

FIG. 14 is a longitudinal sectional view showing a display fluorescent lamp according to Embodiment 11 of the present invention.

FIG. 15 is a perspective view showing a cylindrical conductive material in FIG. 14;

FIG. 16 is a longitudinal sectional view showing a fluorescent lamp for display according to a twelfth embodiment of the present invention.

FIG. 17 is a longitudinal sectional view showing a fluorescent lamp for display according to Embodiment 13 of the present invention.

FIG. 18 is a diagram illustrating a state of light output when the light output unit is hemispherical.

FIG. 19 is a diagram illustrating a state of light output when the light output unit has a flat plate shape.

FIG. 20 is a longitudinal sectional view showing a display fluorescent lamp according to Embodiment 14 of the present invention.

FIG. 21 is a longitudinal sectional view showing a display fluorescent lamp according to Embodiment 15 of the present invention.

FIG. 22 is a longitudinal sectional view showing a display fluorescent lamp according to Embodiment 16 of the present invention.

FIG. 23 is a longitudinal sectional view showing a display fluorescent lamp according to Embodiment 17 of the present invention;

FIG. 24 is a diagram illustrating an effect when a glass coating is applied to a portion of an internal electrode corresponding to a position of a second external electrode.

FIG. 25 is a perspective view showing a display element according to Embodiment 18 of the present invention;

FIG. 26 is a perspective view showing a display element according to Embodiment 19 of the present invention.

FIG. 27 is a schematic diagram showing a display element according to Embodiment 20 of the present invention.

FIG. 28 is a perspective view showing a display device according to Embodiment 21 of the present invention.

FIG. 29 is a perspective view showing a base member provided with a cylindrical protrusion in FIG. 28;

30 is a longitudinal sectional view showing the display fluorescent lamp in FIG. 28.

FIG. 31 is a longitudinal sectional view showing a display element according to Embodiment 22 of the present invention.

FIG. 32 is a longitudinal sectional view showing a display element according to Embodiment 23 of the present invention.

FIG. 33 is a longitudinal sectional view showing a display element according to Embodiment 24 of the present invention;

FIG. 34 is a longitudinal sectional view showing a display element according to Embodiment 25 of the present invention.

FIG. 35 is a vertical sectional view showing a display element according to Embodiment 26 of the present invention;

FIG. 36 is a perspective view showing a display element according to Embodiment 27 of the present invention.

FIG. 37 is a front view showing the light shielding means in FIG. 36.

FIG. 38 is a side view showing the light shielding means in FIG. 36.

FIG. 39 is a perspective view showing a conventional fluorescent lamp for display, partially cut away.

FIG. 40 is a longitudinal sectional view showing a conventional display fluorescent lamp.

[Explanation of symbols]

1 display fluorescent lamp, 1R red light emitting lamp, 1G green light emitting lamp, 1B blue light emitting lamp, 2 glass bulb (tubular container), 2a
Large diameter part, 2b Small diameter part, 3 internal electrode, 4 external electrode, 7 phosphor layer,
8 light output section, 8a hemispherical projection,
8b semi-cylindrical projection, 9 insulating film, 10
Conductive material, 11 filter cap, 12 second external electrode, 13 glass coating, 21 display element, 23,
24 connecting members, 25 convex portions, 2
6 insulating tubes, 27, 29 adhesive layers,
28 insulating cap, 30, 31 protrusion,
32 hollow part, 33 light shielding means,
99 folds

Continuation of front page (72) Inventor Sadayuki Matsumoto 8-1-1, Tsukaguchi-Honmachi, Amagasaki-shi Mitsubishi Electric Corporation Materials and Devices Laboratory (56) References JP-A-5-190152 (JP, A) JP-A Sho62 -217554 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 65/00 G09F 9/313

Claims (41)

(57) [Claims] 1. A dielectric cylindrical container having a large-diameter portion filled with a rare gas, and a small-diameter portion connected substantially coaxially to one end surface of the large-diameter portion and having an outer diameter smaller than the large-diameter portion. And a light-transmitting portion having a light-transmitting property formed on the other end surface portion on the large-diameter portion side, and inserted into the cylindrical container from an end surface portion not connected to the large-diameter portion on the small-diameter portion side. An internal electrode, a phosphor layer formed on the inner surface other than the light output portion on the large diameter portion side of the cylindrical container, and provided on the outer surface of the large diameter portion other than the light output portion of the cylindrical container. A display fluorescent lamp comprising an external electrode, wherein the axial length of the small-diameter portion is larger than an insulation distance required for a voltage applied between the internal electrode and the external electrode. 2. The fluorescent lamp for display according to claim 1, wherein the phosphor layer extends to a small diameter side of the cylindrical container. 3. The fluorescent lamp for display according to claim 1, wherein the length of the external electrode is shorter than the length in the axial direction of the large-diameter portion of the cylindrical container. 4. The fluorescent lamp for display according to claim 3, wherein the external electrode is formed near an end face of the large-diameter portion opposite to the light output portion. 5. The display fluorescent lamp according to claim 1, further comprising a fold or wrinkle structure on the outer surface of the small diameter portion for increasing a creepage distance. 6. The display according to claim 1, wherein the external electrode is formed by applying or printing a conductive paste on the outer peripheral surface of the cylindrical container. Fluorescent lamp. 7. The display fluorescent lamp according to claim 1, wherein the external electrode extends to an outer surface of a small diameter portion of the cylindrical container. 8. The display fluorescent lamp according to claim 1, wherein an insulating film is provided on an outer surface of the external electrode. 9. The cylindrical container according to claim 1, wherein a boundary portion from the large diameter portion to the small diameter portion has a portion whose outer diameter changes in an arc shape or a slope shape. Fluorescent lamp for display as described. 10. The display according to claim 1, wherein the external electrode is made of a cylindrical or C-shaped conductive material inserted into the outside of the cylindrical container. For fluorescent lamp. 11. The fluorescent lamp for display according to claim 1, further comprising a filter cap having a wavelength selective transmission outside the light output unit. 12. The filter cap according to claim 11, wherein the filter cap is a neutral density filter.
The fluorescent lamp for display according to 1. 13. The fluorescent lamp for display according to claim 11, wherein the filter cap is a color filter. 14. The filter cap according to claim 11, wherein the filter cap is made of silicone rubber.
The fluorescent lamp for display according to any one of the above. 15. The fluorescent lamp for display according to claim 1, wherein a part of the shape of the light output portion has a flat surface. 16. The display according to claim 15, wherein the member forming the light output section is made of a dielectric material having a softening point higher than the softening point of the dielectric material forming the cylindrical portion of the cylindrical container. For fluorescent lamp. 17. The fluorescent lamp for display according to claim 16, wherein soda lime glass is used as a dielectric constituting the light output portion, and lead glass is used as a dielectric constituting the cylindrical portion. 18. The dielectric material constituting the light output section is a dielectric material having wavelength selective transmission.
The fluorescent lamp for display according to any one of claims 1 to 17. 19. The display fluorescent lamp according to claim 18, wherein the dielectric constituting the light output section has a characteristic of a neutral density filter. 20. The fluorescent lamp for display according to claim 18, wherein the dielectric constituting the light output section has a characteristic of a color filter. 21. A plurality of hemispherical projections provided on an outer surface of a light output section.
The fluorescent lamp for display according to any one of the above. 22. Concentrically provided on the outer surface of the light output section .
Display fluorescent lamp according to any one of claims 20 to claim 15, characterized in that it comprises a plurality of projections in which the ring-shaped are. 23. The method according to claim 1, wherein a second external electrode is provided on an outer surface of the small diameter portion of the cylindrical container.
The fluorescent lamp for display according to any one of the above. 24. The display according to claim 23, wherein the position of the second external electrode is set so as not to overlap with the phosphor layer extending to the connection portion of the small diameter portion with the large diameter portion. Fluorescent lamp. 25. The display fluorescent lamp according to claim 23, further comprising an internal electrode coated with a dielectric at a portion corresponding to the position of the second external electrode. 26. A display element comprising a plurality of display fluorescent lamps according to claim 1 arranged in a line or in a plane. 27. The display according to claim 26, wherein three or more kinds of display fluorescent lamps including a red light emitting lamp, a green light emitting lamp, and a blue light emitting lamp are used in parallel. element. 28. A display fluorescent lamp for red light emission, green light emission and blue light emission, wherein the external electrodes have different lengths for the respective colors. The display element as described in the above. 29. The display fluorescent lamps are arranged in a matrix of rows and columns, and external electrodes or internal electrodes of the display fluorescent lamps in the same row and internal electrodes of the display fluorescent lamps in the same column. 28. The display element according to claim 26, wherein the external electrodes are connected to each other. 30. A plurality of cylindrical projections are provided on a plane or a curved surface on which display fluorescent lamps are arranged, and a small-diameter portion of the display fluorescent lamp is inserted into a center hole of the projections. The display device according to any one of claims 26 to 29, wherein the large-diameter portion of the display fluorescent lamp is covered with a common insulating tube. 31. The display device according to claim 30, wherein an adhesive is interposed between the display fluorescent lamp and the insulating tube. 32. The display element according to claim 30, wherein the insulating tube is a heat-shrinkable tube. 33. The display device according to claim 30, wherein the insulating tube covers a light output portion of the display fluorescent lamp.
The display element according to 1. 34. The display element according to claim 33, wherein the insulating tube is made of a material having a wavelength selective transmission. 35. The display element according to claim 33, wherein the insulating tube is a neutral density filter. 36. The display device according to claim 33, wherein the insulating tube is a color filter. 37. The display element according to claim 33, wherein the insulating tube is made of silicone rubber. 38. The display element according to claim 33, wherein an adhesive layer is interposed between the insulating tube and the display fluorescent lamp. 39. The display element according to claim 30, wherein a projection is formed on an outer surface of the cylindrical projection. 40. A projection is provided on the inner surface of a portion of the insulating tube covering the outer surface of the cylindrical projection, and the outer surface of the cylindrical projection corresponding to the projection is connected to the projection. 39. The indented portion provided with a concave portion.
The display element according to any one of the above. 41. The display device according to claim 26, further comprising light shielding means for shielding external light to the light output portion of the display fluorescent lamp.
0. The display element according to any one of 0.