JPH066446Y2 - Display discharge lamp - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention can enhance the brightness by enabling driving with an AC power source, and maintains a long life even when driven intermittently by a pulse signal. The present invention relates to a display discharge lamp which is extremely suitable for use in a display panel or the like, which is capable of emitting colored light.

[0002]

2. Description of the Related Art Conventionally, as a medium for providing information or advertising to a large number of people outdoors, a display panel mounted on the roof or the outer wall of a building such as a scroll type display panel or a matrix type display panel. Exists. As a display light source used in such a display panel, a large number of display discharge lamps 21 as shown in FIG. 4 which consume less power and have excellent life characteristics are used. In the conventional display discharge lamp 21 described above, the wire-shaped anode 23 is inserted and opposed to the lower end of the opening of the inverted frustoconical cathode 22, which is made of glass filled with discharge gas. The airtight container 24 has a structure in which it is arranged. When a predetermined DC voltage is applied between the cathode 22 and the anode 23 of the display discharge lamp 21, the lower end portion of the opening of the cathode 22 and the anode 23.
A trigger discharge is generated between the cathode 22 and the portion surrounded by the lower end of the opening of the cathode 22, and this becomes a glow discharge and is transferred to the inner surface of the inverted truncated cone-shaped cathode 22. The glow discharge produces a bright negative glow on the inner surface of the cathode 22, the inner surface of the cathode 22 is reflected by the negative glow, and further intense light is emitted forward through the condenser lens 24a.

[0003]

However, since the above-mentioned conventional display discharge lamp 21 is driven by a DC power source, it is difficult to perform brightness modulation, and in addition, a scroll type display panel or a matrix type display panel is used. Driving the display discharge lamp in a time division manner often used in
When driven by a so-called pulse drive method, there is a problem that the life characteristics are deteriorated.

Therefore, in the present invention, it is possible to easily perform brightness modulation by making it possible to drive with an AC power source and to achieve high brightness, and even when driven by a pulse drive method, the life is shortened. It is intended to realize a display discharge lamp which can have good characteristics and can also emit colored light.

[0005]

In order to achieve the above-mentioned object, the display discharge lamp of the present invention has comb-teeth-shaped electrodes facing each other with a gap on the surface of a rear substrate made of an electrical insulator. , This electrode is covered with a dielectric, and a fluorescent material layer is formed on the inner surface of the back substrate and the discharge space so as to cover the electrode and the dielectric and is made of a light-transmitting electrical insulator. The front substrate thus formed is arranged, and the front substrate is enclosed together with an ultraviolet radiation gas in an airtight container having a light transmitting property.

[0006]

The display discharge lamp has an AC power supply because electrodes are arranged on the surface of the rear substrate so as to face each other with a gap, and the electrodes are covered with a dielectric and enclosed in an airtight container. Can be driven by. By forming the electrodes arranged on the surface of the back substrate in the shape of a comb, the electric field strength between the electrodes is made uniform, and it is possible to realize a bright display discharge lamp without uneven brightness due to uniform discharge light emission over the entire area of the electrodes. it can. By arranging a front substrate that is transparent and has a fluorescent material layer formed on the inner surface facing the back substrate, and by enclosing a UV radiating gas in an airtight container, it is possible to discharge the UV light between the electrodes. And the ultraviolet light excites the fluorescent material to produce the desired colored light emission.

[0007]

【Example】

1 is a sectional view showing a display discharge lamp of the present invention, and FIG. 2 is a schematic perspective view showing a rear substrate used in the display discharge lamp of the present invention.

In the figure, 1 is a display discharge lamp of the present invention, 2 is a rear substrate made of a translucent material such as glass,
3 ₁ and 3 ₂ are electrodes made of a transparent conductive film such as tin oxide deposited on the surface of the back substrate 2, 4 is a transparent dielectric layer such as glass that covers the surfaces of the electrodes 3 ₁ and 3 ₂ , Reference numeral 5 is a reflection layer formed on the back surface of the rear substrate 2 and formed of an aluminum foil or an aluminum vapor-deposited film for reflecting light forward, 6 is a front substrate made of a light-transmitting material such as glass, and 7 is A fluorescent substance layer 8 deposited on the inner surface of the front substrate 6 has a thickness of 0.1 to 0.
A spacer for forming a discharge space of about 3 mm,
9 ₁ and 9 ₂ connect the electrodes 3 ₁ and 3 ₂ to the lead pins 10 ₁ and 10
₂ is a lead wire for connecting to ₂ , and 11 are lead wires 9 ₁ , 9
_A tube body formed of a glass tube or an insulating coating for preventing abnormal discharge in ₂ , reference numeral 12 is a flat plate-shaped stem having a convex lens portion 12a for condensing at the front and a sealing portion 12c at the bottom, a so-called botam stem 12b is an airtight container made of transparent glass. Further, the airtight container 12 is filled with an ultraviolet ray radiating gas mainly composed of a single substance or a mixture of rare gases such as helium and xenon. As shown in FIG. 2, the electrodes 3 ₁ and 3 ₂ are formed so as to face each other on the surface of the rear substrate 2 so as to face each other with a comb-like gap. On the surface of the dielectric layer 4 covering the electrode 3 _1, 3 _2, to protect the dielectric layer 4 from the ion bombardment, without protective film made of magnesium oxide (illustrated with an anti-ion impact ) Is deposited to a thickness of about 100 to 250 nm. And, although not particularly shown,
The back substrate 2 and the front substrate 6 are clamped by a clip or the like made of metal having spring elasticity.

However, in the display discharge lamp 1 having the above-mentioned structure, when a predetermined AC voltage is applied between the electrodes 3 ₁ and 3 ₂ through the lead pins 10 ₁ and 10 ₂ , the comb-teeth-shaped electrode portions interpose with each other. A discharge is generated in the discharge space above the formed gap, and this discharge causes the ultraviolet radiation gas such as helium and xenon enclosed in the airtight container 12 to generate ultraviolet rays having a wavelength of 147 nm, and the ultraviolet rays also cause the front substrate. The fluorescent substance layer 7 deposited on the inner surface of 6 is excited to obtain colored light emission. Then, of the colored light emission, the light that has passed through the front substrate 6 is condensed by the convex lens portion 12a of the airtight container 12 and irradiates the front side, and the transparent dielectric layer 4 and the transparent electrodes 3 ₁ , 3 ₂ The light transmitted through the rear substrate 2 is reflected by the reflective layer 5, is transmitted through the rear substrate 2, the electrodes 3 ₁ , 3 ₂ and the dielectric layer 4 again, is condensed by the convex lens portion 12a, and illuminates the front. Therefore, the light emission obtained as described above can be used very efficiently for display.

FIG. 3 shows a voltage waveform 13 and a current waveform 1 when the display discharge lamp 1 of the present invention is driven by an AC power source.
FIG. 4 is an explanatory view showing 4 and 4. In the display discharge lamp 1 of the present invention, a high frequency power source of 5 to 40 KHz is used as a driving power source. When the brightness of the display discharge lamp 1 is adjusted, the frequency of the high frequency power supply may be changed. When the frequency is increased, the number of discharges per unit time shown by the current waveform 14 increases and the brightness increases.
On the other hand, when the frequency is lowered, the number of discharges per unit time is reduced and the brightness is lowered.

[0011]

As described above in detail, according to the display discharge lamp of the present invention, the comb-teeth-shaped electrodes are arranged on the surface of the rear substrate so as to face each other with a gap, and the electrodes are covered with a dielectric. By encapsulating in an airtight container, the electric field strength between the electrodes is made uniform, and it is possible to obtain a bright display discharge lamp with no uneven brightness due to uniform discharge light emission over the entire area of the electrodes. By making it possible to drive with a power supply, life characteristics are made extremely excellent even when driven by a pulse drive method, and it is easy to perform brightness modulation by changing the frequency of the drive power supply. It is possible to realize a high-luminance display discharge lamp. In addition, electrodes are placed on the surface of the rear substrate so that a fluorescent substance layer is formed on the inner surface of the front substrate that is separated from the rear substrate by a discharge space, and an ultraviolet radiation gas is enclosed in an airtight container. By doing so, the display discharge lamp can obtain a desired colored light emission, and therefore, in the display panel using the display discharge lamp of the present invention, an extremely excellent information transmission effect and advertising effect can be exhibited. It is a thing.

[Brief description of drawings]

FIG. 1 is a sectional view of a display discharge lamp of the present invention.

FIG. 2 is a schematic perspective view of a rear substrate used in the display discharge lamp of the present invention.

FIG. 3 is an explanatory diagram showing voltage / current waveforms of the display discharge lamp of the present invention.

FIG. 4 is a front view of a conventional display discharge lamp.

[Explanation of symbols]

1 Display Discharge Lamp 2 Rear Substrate 3 ₁ , 3 ₂ Electrode 4 Dielectric Layer 6 Front Substrate 7 Fluorescent Material Layer 12 Airtight Container

Claims (1)

[Scope of utility model registration request] 1. A comb-teeth-shaped electrode is arranged on a surface of a back substrate made of an electrical insulator so as to face each other with a gap, and the electrode is covered with a dielectric, and the electrode and the dielectric are covered. A front substrate, which is made of a light-transmitting electrical insulator and has a fluorescent substance layer formed on the inner surface thereof, is disposed to separate the rear substrate and the discharge space from each other. A display discharge lamp characterized by being enclosed in an airtight container.