JPH04294045A - Discharge lamp for display - Google Patents

Abstract

PURPOSE:To equip a displaying discharge lamp to be used in a display board, etc., with high brightness and with a function to make multi-color light emission. CONSTITUTION:Comb-form electrodes 51, 52 are provided on the surface of an insulative base board 21 in such a way as oppositely with a discharge gap reserved in between and covered with a dielectric substance layer 6. A fluorescent substance layer 9 is formed as covering the surface of another insulative base board 22, and the surface where this fluorescent substance layer 9 is arranged so as to confront the surface where the abovementioned comb-form electrodes 51, 52 are formed. The two base boards 21, 22 are encapsulated together with an ultraviolet ray emitting gas in an airtight vessel 3 having light transmissibility, and their end faces 2a, 2a are oriented in the light emitting direction in the airtight vessel 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display discharge lamp used for a display panel, etc., and more particularly to a display discharge lamp which is capable of increasing brightness and emitting multicolor light.

0002

[Prior Art] Conventionally, display panels such as scroll type display panels and matrix type display panels, which can be attached to the roof or outer wall of a building, have been used as media for providing information or advertising to a large number of people outdoors. exist. As a display light source used in such a display panel, a display discharge lamp 21 as shown in FIG. 4 has been proposed by the applicant of the present invention. As shown in FIG. 5, this display discharge lamp 21 has comb-shaped electrodes 51 on the surface of a back substrate 22 made of an electrical insulator.
, 52 are formed facing each other with a discharge gap in between, and are covered with a dielectric layer 6. A front substrate 23 made of a translucent electrical insulator and having a fluorescent material layer 9 deposited on its inner surface is disposed above the rear substrate 22 with a space therebetween;
This is sealed in a translucent airtight container 3 together with an ultraviolet emitting gas such as helium or xenon. Lead wires 7, 7 are led out from the ends of the electrodes 51, 52 and connected to the upper ends of external terminals 8, 8. With this configuration, it becomes possible to drive the display discharge lamp 21 with an AC power supply, which solves the problem of reduced life characteristics caused by driving the display discharge lamp with a DC power supply, and provides a good result. Life characteristics can be obtained. When a predetermined alternating current voltage is applied between the electrodes 51 and 52 of the display discharge lamp 21, the comb-shaped electrode portions penetrate into each other, making the electric field strength between the electrodes uniform, and discharging above the gap between the electrodes. A uniform discharge is generated in the space over the entire electrode area, and this discharge causes the ultraviolet radiation gas sealed in the airtight container 3 to generate ultraviolet light with a wavelength of 147 nm.
The ultraviolet rays excites the fluorescent material layer 9 formed on the inner surface of the front substrate 23 to obtain colored light emission with uniform brightness. The light that has passed through the front substrate 23 of the above-mentioned emitted light is focused by the convex lens portion 3a of the airtight container 3 and irradiates the upper part. The light that has passed through is reflected by the reflective layer 4, passes through the back substrate 22, the electrodes 51 and 52, and the dielectric layer 6 again, and is focused by the convex lens portion 3a and irradiates the upper part. The luminescence obtained can be used extremely efficiently for display purposes.

0003

However, in the above-mentioned display discharge lamp 21, the light emitting area is spread over the entire front substrate 23, and the light is widely dispersed, so that it is required to be installed outdoors in bright light and has a strong contrast. The brightness was insufficient for use in display panels. Furthermore, not only the above-mentioned display discharge lamp 21 but also ordinary display discharge lamps, although it is possible to emit colored light such as red, green, and blue by changing the type of fluorescent substance, one Display discharge lamps can only emit light of one color, and therefore it is extremely difficult to perform color display using the three primary colors of red, green, and blue using a display panel using display discharge lamps. Therefore, an object of the present invention is to realize a display discharge lamp that has high brightness and can emit multicolor light with a single display discharge lamp.

0004

[Means for Solving the Problems] In order to achieve the above-mentioned object, the display discharge lamp of the present invention has comb-shaped electrodes formed on an insulating substrate facing each other across a discharge gap, and at least the comb-shaped electrodes is coated with a dielectric material, and a fluorescent material layer is formed on an insulating substrate, and the comb-shaped electrode forming surface and the fluorescent material layer forming surface are arranged to face each other, and this is transparent together with an ultraviolet emitting gas. The device is characterized in that it is sealed in an airtight container that has optical properties, and that each end face of the insulating substrate is disposed so as to face the direction in which light is emitted in the airtight container. Alternatively, a plurality of sets of insulating substrates on which comb-shaped electrodes are formed and insulating substrates on which fluorescent material layers are deposited may be disposed in an airtight container.

[0005]

[Function] Forming comb-shaped electrodes on an insulating substrate facing each other with a discharge gap in between, coating at least the comb-shaped electrodes with a dielectric material, and forming a fluorescent material layer on the insulating substrate,
The comb-shaped electrode forming surface and the fluorescent material layer forming surface are arranged to face each other, and are sealed together with an ultraviolet emitting gas in a light-transmitting airtight container, and each end surface of the insulating substrate is airtightly sealed. By arranging the light emission direction in the container, the light emitted from the surface of the insulating substrate is concentrated in a substantially linear shape, resulting in a small light emitting area and high brightness. and,
When multiple sets of insulating substrates on which comb-shaped electrodes are formed and insulating substrates on which fluorescent material layers are deposited are placed in an airtight container, multiple types of fluorescent materials with different luminescent colors may be provided. By individually driving the comb-shaped electrodes corresponding to these fluorescent substances, it is possible to emit multicolor light with one display discharge lamp.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic cross-sectional view of a display discharge lamp according to the present invention. 1 in the figure is a display discharge lamp of the present invention, which is made of five insulating substrates 2 made of a translucent material such as glass.
1, 22, 23, 24, and 25 are arranged in parallel with a space of about 0.1 to 0.3 mm between each using a spacer or the like, and the end surface 2a of these insulating substrates 2 is placed in an airtight container 3 so that the light can be transmitted. It is placed in the radial direction. This airtight container 3 is made of transparent glass, which has a convex condensing lens part 3a formed in the upper part in the light emission direction, and a so-called bottom stem 3c, which is a flat stem having a sealing part 3b at the bottom. The interior is filled with an ultraviolet emitting gas consisting mainly of rare gases such as helium and xenon or a mixture thereof.

000
7. On one side of the insulating substrate 21, a reflective layer 4 made of aluminum foil, aluminum vapor deposition film, etc. for reflecting light is deposited, and on the other side, as in the explanation of FIG. 5 above, Electrode 5 made of a transparent conductive film such as tin oxide
The electrodes 51 and 52 are deposited facing each other with a discharge gap in the shape of a comb, and the surfaces of the electrodes 51 and 52 are coated with a transparent dielectric layer 6 such as glass. A protective film (not shown) made of magnesium oxide or the like having ion bombardment resistance is deposited on the surface to a thickness of about 150 to 250 nm. Then, the electrode 51 is used as a common electrode, and a lead wire 71 is led out from one end of the electrode 51 to form a common external terminal 8.
At the same time, a lead wire 72 is led out from one end of the electrode 52 and connected to an external terminal 82 .

An insulating substrate 2 facing the electrodes 51 and 52
A fluorescent material layer 91 that emits green light when irradiated with ultraviolet rays is coated on one side of 2, and a fluorescent material layer 92 that emits red light when irradiated with ultraviolet rays is coated on the other side. .

On one side of the insulating substrate 23 facing the fluorescent material layer 92 of the insulating substrate 22, there are electrodes 51 and 52 facing each other with a discharge gap in the shape of a comb, and a transparent dielectric material such as glass. A layer 6 and a protective film (not shown) having ion bombardment resistance are deposited on the other surface, and electrodes 51, 52, a dielectric layer 6, and a protective film are similarly deposited on the other surface. Then, using the electrode 51 on one side of the insulating substrate 23 as a common electrode, a lead wire 73 is led out from one end thereof and connected to the lead wire 71, and a lead wire 74 is led out from one end of the electrode 52 and connected to an external terminal 83. Connected. Further, the electrode 51 on the other side of the insulating substrate 23 is used as a common electrode, and a lead wire 75 is led out from one end thereof and connected to the lead wire 71, and a lead wire 76 is led out from one end of the electrode 52 and connected to the external terminal 84. Connected.

On one side of the insulating substrate 24 facing the other side of the insulating substrate 23 is coated a fluorescent material layer 93 that emits blue light when irradiated with ultraviolet rays, and on the other side is coated a fluorescent material layer 93 that emits blue light when irradiated with ultraviolet rays. In order to increase the brightness of the green color, a fluorescent material layer 91 that emits green light when irradiated with ultraviolet light is further applied.

On one side of the insulating substrate 25 opposite to the other side of the insulating substrate 24, there are electrodes 51 and 52 facing each other with a discharge gap in a comb-like shape, a dielectric layer 6, and an ion impact resistant layer. A protective film (not shown) having an opaque oxide film (not shown) is deposited thereon, and a reflective layer 4 made of aluminum foil, aluminum evaporated film, or the like for reflecting light is deposited on the other surface. Then, using the electrode 51 on one side of the insulating substrate 25 as a common electrode, a lead wire 77 is led out from one end thereof and connected to the lead wire 71, and a lead wire 78 is led out from one end of the electrode 52 and connected to an external terminal 85. Connected.

Further, a reflective layer 4 made of aluminum foil, aluminum vapor deposition film, etc. for reflecting light is provided on one side of the end faces in three directions excluding the upper end face 2a in the light emission direction of the insulating substrates 2 arranged in parallel. A reflecting plate 10 is disposed on the upper end surface 2a, which is the direction in which the light is emitted.
The light emitted in directions other than the above is reflected by the reflective layer 4, and is finally emitted upward from the convex condensing lens portion 3a of the airtight container 3.

The above lead wires 71, 72, 73, 74, 7
Although not particularly shown, 5, 76, 77, and 78 may be configured to cover a tube body made of a glass tube or an insulating coating in order to prevent abnormal discharge.

However, in the display discharge lamp 1 constructed as described above, when a predetermined AC voltage is applied between the electrodes 51 and 52 of the insulating substrate 21 through the external terminals 81 and 82, the comb-shaped electrode portions enter into each other. A discharge is generated in the discharge gap formed by the discharge, and this discharge causes the ultraviolet radiation gas such as helium or xenon sealed in the airtight container 3 to generate ultraviolet light with a wavelength of 147 nm.
This ultraviolet light excites the fluorescent substance layer 91 formed on one surface of the insulating substrate 22 to obtain green light emission.

Furthermore, when a predetermined AC voltage is applied between the electrodes 51 and 52 on one side of the insulating substrate 23 through the external terminals 81 and 83, the ultraviolet rays generated by the discharge in the discharge gap of the comb-shaped electrode portion are The fluorescent material layer 92 deposited on the other surface of the substrate 22 is excited to emit red light. Furthermore, when a predetermined AC voltage is applied between the electrodes 51 and 52 on the other side of the insulating substrate 23 through the external terminals 81 and 84, the ultraviolet rays generated by the discharge in the discharge gap of the comb-shaped electrode portion are applied to the insulating substrate 24. A fluorescent material layer 93 deposited on one surface is excited to emit blue light. Similarly,
When a predetermined AC voltage is applied between the electrodes 51 and 52 on one side of the insulating substrate 25 through the external terminals 81 and 85, the ultraviolet rays generated by the discharge in the discharge gap of the comb-shaped electrode portion are applied to the other side of the insulating substrate 24. The fluorescent material layer 91 deposited on the surface of the phosphor layer 91 is excited to emit green light.

[0016] Then, by the AC voltage applied from the drive circuit of the display discharge lamp 1 to the external terminals 81, 82, 83, 84, 85, the above-mentioned red, green, and blue light is emitted selectively or in combination. It will be necessary to do so. The light emitted from the surface of the insulating substrate 2 as described above is concentrated in a substantially linear shape from the upper end surface 2a of the insulating substrate 2, increasing its brightness, and is emitted upward from the condensing convex lens portion 3a of the airtight container 3. be done.

FIG. 2 shows another embodiment of the display discharge lamp 1 of the present invention, in which the arrangement of the electrode 5 and the fluorescent material layer 9 formed on the insulating substrate 2 is changed. On one side of the insulating substrate 21, a reflective layer 4 made of aluminum foil or aluminum vapor deposition film for reflecting light is deposited, and on the other side, a fluorescent material layer that emits green light when irradiated with ultraviolet rays is formed. 91 is attached.

On one side of the insulating substrate 22 opposite to the other side of the insulating substrate 21, there are electrodes 51 and 52 facing each other with a discharge gap in a comb-like shape, and a transparent dielectric layer 6 made of glass or the like.
and a protective film (not shown) having ion bombardment resistance, and a fluorescent substance layer 92 that emits red light when irradiated with ultraviolet rays is coated on the other side. Then, the electrode 5
1 as a common electrode, a lead wire 71 is led out from one end thereof and connected to the upper end of the common external terminal 81, and the electrode 5
A lead wire 72 is led out from one end of 2 and connected to an external terminal 82.

On one side of the insulating substrate 23 facing the fluorescent substance layer 92 of the insulating substrate 22, there are electrodes 51 and 52 facing each other with a discharge gap in a comb-like shape, and a transparent dielectric material such as glass. A layer 6 and a protective film (not shown) having ion bombardment resistance are deposited on the other surface, and electrodes 51, 52, a dielectric layer 6, and a protective film are similarly deposited on the other surface. Then, using the electrode 51 on one side of the insulating substrate 23 as a common electrode, a lead wire 73 is led out from one end thereof and connected to the lead wire 71, and a lead wire 74 is led out from one end of the electrode 52 and connected to an external terminal 83. Connected. Further, the electrode 51 on the other side of the insulating substrate 23 is used as a common electrode, and a lead wire 75 is led out from one end thereof and connected to the lead wire 71, and a lead wire 76 is led out from one end of the electrode 52 and connected to the external terminal 84. Connected.

On one side of the insulating substrate 24 facing the other side of the insulating substrate 23, a fluorescent material layer 93 that emits blue light when irradiated with ultraviolet rays is deposited, and on the other side, a comb-like discharge is formed. Electrodes 51 and 52 facing each other with a gap in between, a dielectric layer 6, and a protective film (not shown) having ion bombardment resistance are deposited. Then, the electrode 51 on the other side of the insulating substrate 24 is used as a common electrode, and the lead wire 7
7 and connect it to the lead wire 71, and connect the electrode 5 to the lead wire 71.
A lead wire 78 is led out from one end of 2 and connected to an external terminal 85.

One surface of the insulating substrate 25 facing the other surface of the insulating substrate 24 is coated with a fluorescent material layer 91 that emits green light when irradiated with ultraviolet rays, and the other surface is coated with a fluorescent material layer 91 for reflecting light. A reflective layer 4 made of aluminum foil, aluminum evaporated film, or the like is deposited.

FIG. 3 shows another embodiment of the display discharge lamp 1 of the present invention, in which five insulating substrates 21, 22, 23,
24, 25 are configured in a so-called mountain shape with the central insulating substrate 23 placed at the top and the other insulating substrates gradually lowered, and the individual insulating substrates 21, 22, 23, 24,
25 itself is also in the shape of a mountain. With this configuration, the convex shapes at the tips of the insulating substrates 21, 22, 23, 24, and 25 match the concave shape of the upper inner periphery of the airtight container 3, thereby freeing up extra space in the narrow space of the airtight container 3. By effectively utilizing the entire area of the insulating substrate 2 as a light-emitting portion without forming a light-emitting portion, it is possible to obtain a display discharge lamp 1 with excellent brightness characteristics. In the above-described embodiment, the structure is such that the three colors of red, green, and blue are emitted, but the structure is not limited to this, and any color may be emitted. be.

Furthermore, in this embodiment, the electrode and the fluorescent material layer were formed on separate insulating substrates, but these were formed on the front and back sides of the same insulating substrate, and a plurality of insulating substrates were formed. Alternatively, the electrode and the fluorescent material layer may be arranged to face each other.

[0024]

As described in detail above, according to the display discharge lamp of the present invention, comb-shaped electrodes are formed on an insulating substrate facing each other with a discharge gap in between, and at least the comb-shaped electrodes are made of a dielectric material. At the same time, a fluorescent material layer is deposited on the insulating substrate, and the comb-shaped electrode forming surface and the fluorescent material layer forming surface are arranged to face each other, and this and the ultraviolet emitting gas have a translucent property. By enclosing the insulating substrate in an airtight container and arranging each end face of the insulating substrate to face the light emission direction in the airtight container, the light emitted on the surface of the insulating substrate is concentrated in a substantially linear shape, and the light emission is The light emitting area in the direction is small and the brightness is high. When multiple sets of insulating substrates on which comb-shaped electrodes are formed and insulating substrates on which fluorescent substance layers are adhered are placed in an airtight container, multiple types of fluorescent substances with different luminescent colors are arranged. By individually driving the comb-shaped electrodes corresponding to these fluorescent substances, it becomes possible to emit multicolor light with one display discharge lamp. Therefore, the display panel using the display discharge lamp of the present invention, unlike the conventional display panel that can only emit monochrome light, can exhibit extremely excellent information transmission and advertising effects by emitting multicolor light. be.

[Brief explanation of drawings]

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

FIG. 2 is a schematic cross-sectional view showing another embodiment of an insulating substrate used in the display discharge lamp of the present invention.

FIG. 3 is a schematic perspective view showing still another embodiment of the insulating substrate used in the display discharge lamp of the present invention.

FIG. 4 is a cross-sectional view of a conventional display discharge lamp.

FIG. 5 is a perspective view showing an insulating substrate used in a conventional display discharge lamp.

[Explanation of symbols]

1 Display discharge lamp 2　Insulating substrate 2a End face 3 Airtight container 51, 52 Electrode 6 Dielectric layer 9. Fluorescent material layer

Claims (2)

[Claims] 1. Comb-shaped electrodes are formed on an insulating substrate so as to face each other with a discharge gap in between, and at least the comb-shaped electrodes are covered with a dielectric material, and a fluorescent material layer is formed on the insulating substrate. , the comb-shaped electrode forming surface and the fluorescent substance layer forming surface are arranged to face each other, and this is sealed together with an ultraviolet emitting gas in a light-transmitting airtight container, and each end surface of the insulating substrate is A display discharge lamp characterized in that it is disposed in an airtight container in a direction in which light is emitted. 2. The display discharge lamp according to claim 1, wherein a plurality of sets of an insulating substrate on which a comb-shaped electrode is formed and an insulating substrate on which a fluorescent substance layer is adhered are disposed in an airtight container. .