JPH081784B2 - Gas discharge display panel - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a gas discharge display panel in which discharge cells arranged in a predetermined pattern are selectively discharged and a desired pattern is displayed by the light emission thereof. Particularly, the present invention relates to a gas discharge display panel in which display brightness is improved by incorporating a condenser lens plate in which a condenser lens is formed in a portion corresponding to each discharge cell into the panel.

[Prior Art] Conventionally, in such a gas discharge display panel, a front substrate and a rear substrate made of glass are opposed to each other at a predetermined interval, and peripheral portions thereof are sealed with a sealing agent to form an airtight envelope. The airtight envelope has a structure in which a plurality of cathodes and anodes facing each other across a discharge gap are enclosed together with a discharge gas.
Further, discharge cells are formed in the facing portions of the cathode and the anode, and the discharge cells are arranged in a predetermined pattern such as a matrix or a parallel pattern.

Thus, when a voltage is selectively applied between the cathode and the anode, a gas discharge is generated in a discharge cell located at a portion where the selected cathode and anode face each other, and the emitted light is emitted through the front substrate to the outside. To produce the desired display pattern.

[Problems to be Solved by the Invention] By the way, since the airtight envelope is required to have mechanical strength, the front substrate, which is a main constituent member of the envelope, is relatively thick with a thickness of about several mm. Things are used. Therefore, a part of the light emitted from the discharge cell is diffused into the inside of the substrate while passing through the front substrate, which causes a problem of reduction in display brightness due to a decrease in the amount of light.

The present invention has been devised in view of the above points, and an object of the present invention is to realize a gas discharge display panel in which display brightness is improved by suppressing diffusion of light into the front substrate.

[Means for Solving the Problem] Therefore, as a result of various studies and experiments, the present inventor has adopted a structure in which light from a discharge cell is condensed and then incident on the substrate. Achieved the purpose.

Therefore, in the gas discharge display panel of the present invention, the front substrate provided with the light transmitting portion and the rear substrate are opposed to each other at a predetermined interval to form an airtight envelope, and the discharge gas is enclosed in the airtight envelope. At the same time, a plurality of cathodes and anodes are arranged so as to face each other with a discharge interval therebetween to form discharge cells at the facing portions of the cathodes and anodes, and the diameter of the holes is gradually increased toward the front substrate. A condenser lens plate formed by disposing a spacer provided in a portion corresponding to the discharge cell between the cathode and the anode, and further forming a condenser lens corresponding to each discharge cell on at least one surface of the transparent substrate. Is disposed between the front substrate and the cathode.

[Operation] As described above, since the hole diameter is gradually increased toward the front substrate and the spacer having the through hole in the portion corresponding to the discharge cell is arranged between the cathode and the anode, All the ignition of the discharge cells toward the substrate side is also reflected and guided to the front substrate side, combined with the light emission toward the front substrate side, and condensed by the condenser lens formed on the condenser lens plate. Is incident on the front substrate and is emitted to the outside with almost no diffusion inside the substrate.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show a gas discharge display panel according to an embodiment of the present invention, which is a cross-sectional view and a cutaway exploded perspective view, respectively.

The gas discharge display panel of the present embodiment is a dot matrix type, and in the figure, the gas discharge display panel 1 has a number of thicknesses.
A front substrate 2 and a rear substrate 3 each made of a glass plate of mm are arranged at a predetermined interval so as to face each other, and the peripheral portions thereof are sealed with a sealing agent (not shown) such as frit glass to form an airtight envelope 4. In addition, a plurality of square rod-shaped cathodes 5 whose surface is coated with an emitter material such as LaB ₆ or BaLaO ₃ and a plurality of square rod-shaped anodes 6 are arranged to face each other across a discharge gap. A structure in which this is enclosed in the airtight envelope 4 together with a discharge gas for generating ultraviolet rays in which Xe is added to He, and a condenser lens plate 7 is arranged between the front substrate 2 and the cathode 5. have.

A conductor layer 9 covered with a porous insulating layer 8 is formed on the back substrate 3, and discharge is started by electrons and ions submerged in the holes of the insulating layer 8 and a potential applied to the conductor layer 9. We are trying to reduce the time.

A plurality of anodes 6 are placed in parallel on the insulating layer 8 and an insulating barrier 10 is formed between the anodes 6, and a plurality of cathodes 5 are formed on the insulating barriers 10 with spacers 11 interposed therebetween.
Are placed in parallel, and further discharge cells 12 are formed in a portion where the cathode 5 and the anode 6 face each other and arranged in a matrix.

The spacer 11 is made of three layers of thin glass, and a rectangular through hole 13 is formed in a portion corresponding to the discharge cell 12.
A phosphor 14 is attached to the inner surface and the periphery of the through hole 13.
The through hole 13 has a hole diameter that increases stepwise from the anode 6 side toward the cathode 5 side, and constitutes a reflector for reflecting the light emitted from the discharge cell 12 to the front substrate 2 side. .

Further, a light-shielding mask 15 made of black glass is formed on the lower surface of the front substrate 2 except for the light-transmitting portion 2a corresponding to the discharge cells 12, and the outline of the display spot formed on the front substrate 2 is formed. It is clear.

The condenser lens plate 7, which is a feature of the present invention, has a thickness of 0.2 to
Formed on both sides of the portion corresponding to the discharge cell 12 in the transparent substrate 16 made of thin glass of about 0.4 mm, convex condenser lenses 17a and 17b for condensing light from the discharge cell 12 are formed, respectively. It is a thing. The condenser lenses 17 and 17b have a diameter of 0.
The dot shape is about 4 to 0.6 m, and the focal lengths thereof are set to be equal to each other. However, as shown in FIG. 3 (A), as shown in FIG. Even if the focal lengths of the optical lenses 17a and 17b are different from each other or the condensing lens 17a is formed only on one surface of the transparent substrate 16 as shown in FIG. 3B, the same effect can be obtained. is there.

To form the condenser lens plate 7, a portion of the transparent substrate 16 corresponding to the discharge cells 12 is coated with a resist, which is chemically etched with hydrofluoric acid or the like, and the isotropic nature of the etching action is used. The method of forming a condenser lens by overetching with a low melting point glass is applied to a portion of the transparent substrate 16 corresponding to the discharge cell 12, and the low melting point glass is heated to melt the surface tension of the glass. Method for forming a condenser lens, or holding the substrate 16 in a carbon mold in which a recess is provided in a portion of the transparent substrate 16 corresponding to the portion where the condenser lens is to be formed. There is a method of heating at a temperature equal to or higher than the softening point of, and embossing.

Thus, when a voltage is applied between the cathode 5 and the anode 6 which have been added, ultraviolet rays are generated by the discharge generated between the electrodes 5 and 6, and the ultraviolet rays are generated by the phosphor 14 attached to the spacer 11. And the discharge cell 12 emits light. At this time, as described above,
Since the light transmission 13 has a stepwise increase in hole diameter from the anode 6 side to the cathode 50 side, and constitutes a reflector for reflecting the light emission of the discharge cell 12 to the front substrate 2 side. Light emitted toward the rear substrate 3 side is also guided to the front substrate 2 side. Then, it is combined with the light emitted toward the front substrate 2 side, is condensed by the condenser lenses 17a and 17b of the condenser lens plate 7, enters the substrate 2, and is emitted to the outside. Thus, all the light from the discharge cell 12 is incident on the front substrate 2 in a condensed state and is emitted to the outside with almost no loss due to diffusion inside the front substrate 2, so that a high display brightness is obtained. Is obtained.

In the above embodiment, the condensing lens plate is shown in which dot-shaped condensing lenses are arranged in a matrix, but a strip-shaped discharge like a bar graph type gas discharge display panel is shown. A condensing lens plate built in a panel in which discharge cells with electrodes are arranged in parallel is suitable with a condensing lens in the shape of a kamaboko, and the point is to have a shape corresponding to the discharge cell of the gas discharge display panel to be incorporated. And those having an array are sufficient.

Further, although the ultraviolet ray generating gas is used as the discharge gas, it can be similarly applied to the case where the visible ray generating gas such as Ne is used.

[Effects of the Invention] As described in detail above, the gas discharge display panel of the present invention includes a spacer provided with a through hole having a hole diameter gradually increasing toward the front substrate in a portion corresponding to the discharge cell, and the spacer serving as the cathode. Since it is arranged between the anode and the anode, the light emitted from the discharge cells toward the rear substrate side is also reflected and guided to the front substrate side.
Combined with the light emitted toward the front substrate side, the light is incident on the front substrate in a state of being condensed by the condenser lens formed on the condenser lens plate, and is emitted to the outside with almost no diffusion inside the substrate. Therefore, high display brightness can be obtained.

[Brief description of drawings]

1 is a sectional view, FIG. 2 is a cutaway exploded perspective view, and FIG. 3 is a sectional view showing an example of the shape of a condenser lens plate. 1 ... Gas discharge display panel, 2 ... Front substrate, 2a ... Translucent part, 3 ... Rear substrate, 4 ... Airtight envelope, 5 ... Cathode, 6 ... Anode, 7 ... Lens plate, 11 ... Spacer, 12 ... Discharge cell, 13 ... Through hole, 16 ... Transparent substrate, 17
a, 17b ... Condensing lens.

Claims (4)

[Claims] 1. A front substrate provided with a light-transmitting portion and a rear substrate are opposed to each other at a predetermined interval to form an airtight envelope, a discharge gas is enclosed in the airtight envelope, and a plurality of cathodes are provided. A discharge cell is formed in a portion where the cathode and the anode face each other by arranging the anode and the discharge electrode so as to face each other at a discharge interval, and a through hole whose hole diameter gradually increases toward the front substrate corresponds to the discharge cell. A spacer provided in the above portion is disposed between the cathode and the anode, and a condenser lens plate formed by forming a condenser lens corresponding to each of the discharge cells on at least one surface of the transparent substrate is provided with the front substrate and the cathode. A gas discharge display panel, characterized in that it is disposed between the gas discharge display panel and the gas discharge display panel. 2. The gas discharge display panel according to claim 1, wherein the condenser lenses are formed on both surfaces of the transparent substrate of the condenser lens plate. 3. The gas discharge display panel according to claim 2, wherein the focal lengths of the condenser lenses formed on both sides of the transparent substrate of the condenser lens plate are equal to each other. 4. The gas discharge display panel according to claim 2, wherein the focal lengths of the condenser lenses formed on both surfaces of the transparent substrate of the condenser lens plate are different from each other.