JPH0359928A - Gas discharge display element and its manufacture - Google Patents

Abstract

PURPOSE:To form a discharge space by means of a bulkhead higher than at least 300mu by hot press molding the bulkhead by means of a press-molding metal die. CONSTITUTION:A bulkhead higher than at least 300mu is hot-press molded by press-molding metal dies 3, 6. The press-molding metal dies 3, 6 used for press molding are formed into a desired bulkhead shape and a mirror face shape, respectively, and are each covered by a chemically stable thin film, and as the base material of each of the press-molding metal dies 3, 6, e.g. superhard alloys, thermet, zirconia, silicon carbide, silicon nitride, stainless steel and the like are suitable and the thin film covering the base material of each of the press molding metal dies 3, 6 is preferably noble metals that do not react with nor fuse with glass, and a simple substance or alloy of tangsten, tantalum, rhenium, or hafnium. A bulkhead of height more than 300mu is thus formed with a super accurate pattern, and a discharge space with long gaps is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a high-luminance, high-definition glass discharge display element (plasma display panel), a method for manufacturing the same, and a press molding die used in the method.

Conventional technology Conventionally, in gas discharge display elements (plasma display panels), the partition wall that partitions the display cell space between two glass panels was formed by a thick film printing method called screen printing. However, it is difficult to form partition walls with a height of 300 microns or more in an ultra-precise pattern.

In the screen printing method, a paste-like barrier rib material is squeezed out with a squeegee from a mesh-like screen on which a mask pattern is pasted, and printed onto a glass panel. In current screen printing, the minimum line width is 100cm and the height is 20ξ.
Kron is the limit, and in order to obtain higher heights,
It is necessary to repeat the process, but there are problems in that the ultra-precise shape of the partition walls is distorted by repeating the process, or that numerous production steps such as drying, firing, annealing, etc. are required. (For example, Japanese Patent Publication No. 62278727) Problems to be Solved by the Invention When a high-definition pattern is formed by screen printing in a conventional full-color gas discharge display element, misalignment of the pattern, staining, dripping, etc. Therefore, there was a problem in that multi-layering by overlapping high-definition patterns was not possible, and barrier ribs higher than 300ξcm could not be formed by screen printing at a pitch of 300 microns.

An object of the present invention is to obtain a gas discharge display element having a discharge space in which barrier ribs higher than 300 microns are formed in a high-definition pattern, and further, barrier ribs higher than 300 microns are formed in a high-definition pattern. The purpose of the present invention is to provide a manufacturing method and a press molding die that can be used.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a gas discharge display element in which a discharge space is formed by a partition wall having a height of at least 300ξcm.

By the manufacturing method of hot press-forming the barrier ribs having a height of at least 300 microns using a press-forming die, it is possible to form a discharge space with a relatively long gap. The press mold used for press molding is processed into a desired partition wall shape and mirror finish, and is coated with a chemically stable thin film.

When the discharge space of the working gas discharge display element is partitioned by partition walls higher than 300 microns, from Paschen's law that the discharge starting voltage Vs becomes a function of the product pd of the gas pressure p and the electrode gap length d, the electrode gap length d is As it increases, the gas pressure p
becomes smaller. When the gas pressure p decreases and the electrode gap length d increases, a positive column of glow discharge appears, atoms in the plasma are excited by collision with electrons, and when they transition to a lower energy level, they emit light in the visible and ultraviolet regions. radiates electromagnetic waves.

In order to display full color, it is common to excite a phosphor to emit light using ultraviolet radiation from rare gas atoms, but the luminance is low due to low luminous efficiency.

On the other hand, in the glow discharge positive column of low pressure, ultraviolet rays (185 nm, 253.7 nm) related to the ground level of mercury
In particular, photoluminescent phosphors that emit strongly at 253.7 nm and are compatible with ultraviolet excitation of mercury can be used, and since the emitted ultraviolet rays are not reabsorbed because of the low pressure region, the luminous efficiency is greatly increased. It is brightness.

Partition walls higher than at least 300 microns can be manufactured by hot press molding using a press mold. The press molding mold used for press molding is
It is processed into a desired partition wall shape and mirror finish, and is coated with a chemically stable thin film. Examples of the base material of the press molding die include cemented carbide, cermet, and zirconia.

Silicon carbide, silicon nitride, stainless steel, etc. are suitable, and the thin film that coats the base material of the press molding die is made of noble metals that do not react or fuse with glass, tungsten, tantalum, rhenium, hafnium, or any of them. It is desirable to be an alloy of.

In the present invention, a more preferable molding atmosphere in which the glass and these thin films do not react or fuse together is an inert gas such as nitrogen, argon, helium, etc., and hydrogen, carbon oxide, or carbon dioxide added to these inert gases. Carbon oxides, methane, ethane.

It is a mixture of hydrocarbons such as ethylene and toluene, halogenated hydrocarbons such as trichloroethylene and trichlorotrifluoroethane, alcohols such as ethylene glycol and glycerin, and fluorocarbons such as F-113 and F-11. .

These atmospheres are appropriately selected depending on conditions such as the glass composition, the composition of the thin film coated on the press-molding mold, the temperature and time of press-molding, and the shape of the partition walls.

EXAMPLE Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Example 1 FIG. 1 shows a method for forming partition walls as an example of the present invention, FIG. 2 is a block diagram of a gas discharge display element formed by the method, and FIG. 3 shows a press or mold. FIG. Cemented carbide (WC-5) is used as the base material for press molds.
A block of TiC-8Co) was wire electrical discharge machined into the shape shown in FIG.

The press-molded surface was further made into a mirror surface with a surface roughness (RMS) of about 30 in about 1 hour using ultrafine diamond powder. Platinum-iridium-osmium alloy (Pt-1r
-Os) was coated with a thin film.

Ni cathode electrode 2 on back plate 1 (soda quartz glass)
was formed by thick film printing. As a partition wall material, lead oxide glass such as 52% by weight of silica (SiO2),
Potassium oxide (K2O) 6% by weight, lead oxide (p
b○) 35% by weight, sodium oxide (Na20
) 5% by weight, the remainder being trace components. The flat plate 5, the lower mold 3 (thickness: 1 mm), the thin glass plate 4, and the flat mold 5 were sandwiched in this order, and the glass was pushed into the slit-like spaces of the lower mold 3. Next, remove the flat mold 5, invert the lower mold 3, press the lower mold 3 against the back plate 1, and press the upper mold 3.
The partition walls 7 were transferred to the back plate 1 by press molding, and the partition walls 7 (height: 0.7 mm) were formed on the back plate 1. In order to prevent the cathode electrode 2 from being deformed due to contact between the cathode electrode 2 and the lower mold 3, a notch is provided in the lower mold 3.

The press molding conditions were as follows: mold temperature: 510''c, press pressure: 10 kg/cIIl, press time: 1 minute, in a nitrogen gas atmosphere, and after press molding, it was slowly cooled to 300°C.

In FIG. 2, an anode electrode 12 and a phosphor 13 are formed on the opposite side of the front plate 11.

The anode electrode 12 is made of Ba alloy, and the phosphor 13 is made of (Gd,
Y) BO2:Eu (red), Zn2SiO4:Mn(
green), B a M g A f u Oa: E
Screen print using u (blue) at predetermined intervals 4
The bottom of the hole was reached at 50°C. The front plate 11 and the back plate 1 are bonded together using a glass frit, and after evacuation using a well-known method, helium (He) 9 is added as a discharge gas into the gas discharge display element.
9wt, xenon (Xe) 0.9wt%, mercury (Hg
) 0.1% by weight of mixed gas was introduced until the pressure reached 30 Torr+7).

Trigger electrode 1 provided between dielectric layer 16 and back plate 1
When 250 volts are applied between 7 and the anode electrode 12 to cause a discharge, charged particles gather near the anode electrode 12 and the discharge tends to occur. The ultraviolet rays 14 accompanying the plasma discharge 15 were emitted into the discharge space, and the ultraviolet rays 14 excited the phosphor 13 to emit light.The luminance of the gas discharge display element operated in this manner was approximately 150 fL. Excellent results were obtained. Also, a large number of homogeneous barrier ribs 7 could be formed in a sharp pattern, there was no crosstalk between display cells, and reliable discharge could be performed.

Embodiment 2 FIG. 4 shows a method of forming barrier ribs as an example of the present invention, and FIG. 5 is a block diagram of a gas discharge display element according to the method. A block of cermet (T i C-10Mo-9N i) was wire electrical discharge machined into the shape shown in FIG. 3 as a base material for a press mold. The press-molded surface was further made into a mirror surface with a surface roughness (RMS) of about 30 in about 1 hour using ultrafine diamond powder. The mirror-finished press mold was coated with a thin film of platinum-tank rhenium alloy (Pt-Ta-Re) by sputtering.

The thickness of the partition wall material is 2 on the front plate 11 (soda quartz glass).
A thick membrane formed on the ribs. As a material for bulkheads, Shi! J force (S
iO2) 65% by weight, potassium oxide (K2O)
A borosilicate glass containing 9% by weight, 10% by weight of boric acid (B203), 10% by weight of sodium oxide (Na20), and the balance being trace components was used.

The front plate 11 coated with the partition wall material was press-molded using the upper die 6 to form the partition wall 7 (height: 1.5 mm) on the front plate 11. Press molding conditions are mold temperature 610°C1
The press pressure was 10 kg/c+Il, the press time was 1 minute, and the press was in an argon gas atmosphere, and after press molding, it was gradually cooled to 350°C.

A mask pattern is placed on the front plate 11 on which the partition wall 7 is formed. Fluorescent material I3 was applied by spray method using a spray gun.

The phosphor 13 is (Gd, Y)BO2:Eu (red), Ba
A/! 120. :Mn (green), BaMgAl u O
a: Using Eu (blue), screen printing was performed at predetermined intervals, and combustion acid was applied at 450°C.

On the other hand, as shown in FIG.
The column electrodes 24 and 24 are provided so as to be orthogonal to each other with the dielectric layer 23 interposed therebetween. A dielectric layer 21 was provided on these electrodes, and an MgO protective film (not shown) was further provided thereon.

These electrodes, dielectric layers, and protective films can be formed by printing, vapor deposition, or sputtering.

The front plate 11 and the back plate 1 manufactured by this method are joined together using a glass frit, and after evacuation by a well-known method, helium (He) is introduced as a discharge gas into the gas discharge display element.
A mixed gas of 99% by weight) and 1% by weight of xenon (Xe) was introduced until the pressure reached 1QTorr.

High frequency pulses of 150 ports with opposite phases were applied to the row electrodes 22 and the column electrodes 24, respectively, to operate the gas discharge display element.

1 Ultraviolet rays 14 accompanying plasma discharge 15 were emitted into the discharge space, and the ultraviolet rays 14 excited the phosphor 13 to emit light. The luminance of the gas discharge display element operated in this manner was approximately 13
An excellent result of 0 fL was obtained. Furthermore, a large number of homogeneous partition walls 7 could be formed in a sharp pattern, and there would be no crosstalk between display cells, allowing reliable discharge to occur.

The gas discharge display element of the present invention, the method for manufacturing the same, and the press-molding mold used in the method are those in which a discharge space is formed by partition walls that are higher than at least 300 ξcm. By using a manufacturing method in which barrier ribs with a height of more than a micron are hot press-formed using a press-forming die, it is possible to form a discharge space with a relatively long gap. The press molding mold used for press molding is characterized by being processed into a desired partition wall shape and mirror finish, and coated with a chemically stable thin film,
Conditions such as the glass composition, the composition of the thin film coated on the press molding die 2, the temperature and time of press molding, and the thickness of the glass layer are not limited to those in this example.

As described in detail, the gas discharge display element of the present invention, the method for manufacturing the same, and the press molding die used in the method include:
In a gas discharge display element, a discharge space is formed by barrier ribs higher than at least 300 μm, and a long gap is formed by hot press-forming the barrier ribs higher than at least 300 μm using a press mold. It becomes possible to form a discharge space.

That is, the present invention has made it possible to mass-produce high-luminance, high-definition gas discharge display elements.

[Brief explanation of drawings]

FIG. 1 is a process diagram showing a method for forming partition walls as an example of the present invention, FIG. 2 is a configuration diagram of a gas discharge display element according to the method, FIG. 3 is a cross-sectional view of a press molding die, and FIG. 4 5 is a process diagram showing a method for forming barrier ribs as an example of the present invention, and FIG. 5 is a diagram showing the configuration of a gas discharge display element according to the method. 1... Rear plate, 2... Cathode electrode,
3...Lower mold, 4...Thin glass plate, 5.
...Flat type, 6...Top type, 7...
Partition wall, 11... Front plate, 12... Anode electrode, 13... Fluorescent material, 14...
Ultraviolet light, 15...Plasma discharge, 16...
...Dielectric layer, 17...Trigger electrode, 21.
... Dielectric layer, 22 ... Row electrode, 23.
...Dielectric layer, 24...Column electrode.

Claims (4)

[Claims] (1) A gas discharge display element in which a discharge space is formed by barrier ribs having a height of at least 300 microns. (2) A method for manufacturing a gas discharge display element in which partition walls are hot press-molded using a press-molding die. (3) A press molding die processed into a desired partition wall shape and mirror finish, and coated with a chemically stable thin film. (4) The press molding die according to claim (3), wherein the thin film is made of a noble metal, tungsten, tantalum, rhenium, or hafnium, or an alloy thereof.