JPH0770288B2 - Gas discharge type panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an AC type or DC type gas discharge panel for performing dot matrix display, and more specifically,
The present invention relates to a gas discharge type panel having cell partition walls formed by stacking a lattice-shaped dielectric and a striped dielectric.

[Prior Art] Generally, an AC in which discharge cells are arranged in an XY matrix.
Type or DC type gas discharge type panel (hereinafter, abbreviated as PDP) requires a dielectric material called a partition in order to secure a discharge gap or prevent crosstalk to an adjacent cell.

When utilizing the emission color of the rare gas itself, such as the orange emission color PDP due to the discharge of neon gas, this partition wall has a unidirectional stripe shape because the emission is limited only to the vicinity of the electrode of the selected cell. However, in the case of considering a multi-color or full-color PDP, since a method of exciting and emitting a phosphor by ultraviolet rays accompanying discharge is adopted, a unidirectional stripe-shaped partition wall has a direction along the partition wall. The leakage of ultraviolet rays may cause the phosphors of the adjacent cells to be excited and emit light. That is, crosstalk or color bleeding is inevitable, color reproducibility and resolution are impaired, and the value of the display is lowered.

Therefore, it is possible to solve this problem by introducing a lattice-shaped partition wall, but in general, PDP has a partition wall sandwiched between two flat glass sheets having excellent flatness, and the periphery is sealed with a sealing glass. In the lattice-shaped partition wall alone, each cell is completely separated by the partition wall, and there is no gap between the cells, so that vacuum exhaust and gas introduction do not reach all the cells. Therefore, it is necessary to secure the gas introduction hole by some method.

To date, lattice-shaped partition walls that secure gas introduction holes by various methods have been proposed. For example, there are the following.

Method A: Thick film method by multi-layer printing of two patterns, a lattice shape and a notched lattice shape (Television Technical Report, p.37-4)
2, No. 15, vol 12, 1988).

Method B: A method in which a photosensitive plate glass is etched to form lattice-shaped partition walls, and one plate glass is grooved (NH
K Giken monthly report, p.55-60, No. 2, Vol. 38, 1986).

Method C: A method of providing a gap between the plate glass and the dielectric by using a spacer thicker than the dielectric when sandwiching the lattice-shaped dielectric between the plate glasses.

[Problems to be Solved by the Invention] Of these, method A is a method that uses thick film printing and is therefore inexpensive and excellent in mass productivity, but with high definition (for example, dot pitch 0.2 mm), Moreover, the formation of the lattice shape requires a very high technology. Considering the alignment when stacking two patterns, the higher the precision, the more strict the precision of the screen plate making, and the more advanced technology is required.

In the method B, the plate glass is grooved as a gas introduction hole, but it is difficult to mechanically groove the glass with a high-definition pitch, the workability is poor, and there is a problem in cost.

The method C generally uses a spacer outside the display area, and although there are few problems with a small display, there is a problem that the larger the size, the more uneven the discharge gap due to the warp of the glass substrate due to the sealing process or the like.

As described above, conventionally, no method has been found which has a high-definition pitch, is relatively inexpensive, and is excellent in mass productivity.

The present invention has been made to solve the above problems, and has a high-definition pitch, is excellent in characteristics such as crosstalk, is relatively inexpensive, has mass productivity, and is a gas discharge type that secures a gas introduction hole. The purpose is to provide a panel.

[Means for Solving the Problems] The object of the present invention is achieved by using a cell partition wall formed by superposing a lattice-shaped dielectric and a stripe-shaped dielectric.

That is, the present invention is an AC-type or DC-type PDP for performing dot matrix display having a cell partition formed by superimposing a lattice-shaped dielectric and a stripe-shaped dielectric, wherein the lattice-shaped dielectric is an etching material. Is a grid-shaped metal plate, and is a grid-shaped dielectric composite in which a dielectric of 1 to 100 μm is deposited on the surface by electrodeposition, and the stripe-shaped dielectric is formed by patterning a glass paste by screen printing. Or pattern formed by printing and developing a photosensitive glass paste, the film thickness is 5-150μ
It is an AC type or DC type PDP characterized by being m.

The lattice-shaped dielectric in the present invention is obtained by thick film printing of a glass paste, etching of a photosensitive plate glass, perforating a plate glass, coating glass on a metal grid plate, etc., processability, panel assembly processability, It may be selected in consideration of cost, adaptability to high definition, and the like. In the present invention, 1 to 1 is formed on the surface of the grid-shaped metal plate as a grid-shaped dielectric.
A grid-like dielectric composite having a 100 μm dielectric applied is preferably used.

The lattice-like metal plate of the lattice-like dielectric composite substrate is preferably 42 wt% Ni-6 wt% Cr-Fe alloy, 50 wt%
Examples include Ni-Fe alloys. The wall thickness of these metal plates is 0.
Those with a diameter of about 05 to 1.0 mm can be preferably used. The linear thermal expansion coefficient of the lattice-shaped metal plate is preferably matched with that of glass, and is usually 80 to 100 (× 10 ^-7 / ° C).

As a method of processing this metal plate into a predetermined grid pattern, a punching method by a press, a laser processing method,
Plating, welding, etching, etc. can be used,
Generally, the etching method is preferably used.

In this lattice-shaped dielectric composition, 1 is formed on the surface of the lattice-shaped metal plate.
~ 100 μm dielectric is deposited.

As the dielectric used here, at least one selected from organic substances, crystalline inorganic substances, and glass can be used. More specifically, glass or a crystalline inorganic substance containing glass is generally used. Taking specific glass composition in _{examples, PbO-B 2 O 3 -SiO} 2, PbO-B 2 O 3, Zn
O-B ₂ O ₃ -SiO ₂ and the like. The softening point of these glasses is preferably 400 to 1000 ° C., and the particle size of the glass is preferably about 1 to 5 μm. Further, as the crystalline inorganic substance, ceramics such as alumina (Al ₂ O ₃ ) and forsterite (2MgO-SiO ₂ ) are used, and further inorganic pigments (FeO-Cr ₂ O ₃ , C
oO-Al ₂ O ₃ etc.) can also be used. The particle size of the crystalline inorganic material is preferably about 1 to 5 μm.

Any organic substance can be used as long as it can be finally made inorganic.

At least one of the following methods can be used for forming the derivative film on the surface of the lattice-shaped metal.

That is, (1) a dipping method in which the dielectric powder is melted, or a dipping method in which the dielectric powder is dissolved or dispersed in water or an organic solvent, (2) a spray method in which the liquid is applied in a spray form, (3) A firing oxidation method in which a base metal is fired and oxidized in a suitable atmosphere to form a metal oxide film on the surface, (4) An anode which forms an oxide film on the metal surface in a suitable electrolyte using the base metal as an anode By utilizing the oxidation method and (5) dispersing the dielectric powder in a liquid, the dielectric particles are charged either positively or negatively,
There is an electrodeposition method in which a base metal is used as a cathode or an anode and charged particles (dielectric particles) are attracted and deposited on a metal surface.

Among these, the most advantageous method may be used in consideration of the uniformity of the coating, the formed thickness, the ease of controlling the forming conditions, the influence on the substrate, and the like. (5) The electrodeposition method is used. Is the best.

In the present invention, the gas introduction hole is created by providing a striped dielectric on the plate glass. The film thickness of the stripe-shaped dielectric is preferably 5 to 150 μm.

As a method of manufacturing the stripe-shaped dielectric, for example, at least one of the following methods can be used.

That is, (1) a method of arranging elongated glass plates at an equal pitch, (2) a method of arranging elongated metal plates coated with glass at an equal pitch, and (3) using a drawing device as a glass paste as ink. A method of drawing lines at equal pitch, (4) a method of patterning a glass paste by screen printing, and (5) a method of printing a photosensitive glass paste and then performing exposure and development to form a pattern can be used.

Of these methods, the most advantageous one may be selected in consideration of workability, processing accuracy, cost, adaptability to high definition, etc. (4) Pattern formation of glass paste by screen printing Or, (5) it is excellent to print, expose and develop a photosensitive glass paste to form a pattern.

(4) Pb is used as a glass paste material for the method of forming a pattern of the glass paste by screen printing.
_{O-B 2 O 3 -SiO 2} , ZnO-B 2 O 3 -SiO 2 , etc., if necessary and a glass component Al ₂ O ₃ such as ceramics and FeO-Cr ₂ O ₃ of, CoO-Al ₂ O ₃
10 to 30 parts by volume of the vehicle is kneaded with 100 parts by volume of powder obtained by mixing and pulverizing the pigments such as.

Next, by screen printing, a stripe-shaped dielectric pattern is obtained. The film thickness that can be formed by one printing varies depending on the screen plate making conditions, the paste formulation, the viscosity, etc., but a thickness of about 5 to 30 μm can be obtained.

After printing once, dry thoroughly in an oven and then overprint. Thus, by repeating printing and drying a large number of times, a dielectric having a desired film thickness can be obtained. However,
The film thickness after baking through the baking process at 500 to 700 ° C. is about 70 to 100% of the film thickness after printing and drying.

High-definition pitch can be achieved with the current printing technology with a pitch of 0.2 mm, which is excellent in adaptability to high-definition.

Next, (5) is a case where a photosensitive glass paste is used, and a commercially available product such as Photo Insulator (produced by Tokyo Ohka Kogyo Co., Ltd.) can be used.

Unlike ordinary glass paste, it is not necessary to form a pattern by screen printing, and solid printing may be performed over the entire area of the region where the stripe is to be formed. However, since it has photosensitivity, it must be handled under yellow light, but the printing technique is extremely simple.

After printing and drying, a pattern is formed through the steps of exposure and development, but if the film thickness is too large, the exposure is insufficient and film peeling during development tends to occur. However, the minimum required film thickness for forming the gas introduction hole is sufficiently obtained. Further, the high definition of pitch is far more accurate than the screen printing method using the above glass paste.

Further, regarding the proper use of the normal glass paste and the photosensitive glass paste, a pattern is formed by screen printing with the normal glass paste up to about 0.2 mm pitch,
Higher definition than 0.2mm pitch is technically difficult with ordinary screen printing, so it is disadvantageous in terms of price, but patterning by printing, exposing, and developing using photosensitive glass paste. Will be done.

[Advantageous Effects of the Invention] In the present invention, when forming an AC type or DC type PDP for performing dot matrix display, in order to suppress deterioration of display quality such as crosstalk between dots or color bleeding, a lattice-shaped dielectric is used. In order to solve the problem that the introduction of gas into all dots becomes uncertain due to the use of a partition wall made of, a partition wall made of a stripe-shaped dielectric is solved.

[Examples] Hereinafter, the present invention will be described in more detail with reference to Examples and the like.

Example 1 A lattice-shaped dielectric was prepared by the following method.

That is, as the lattice-shaped metal serving as the base, 42 wt% Ni-6 wt% Cr-Fe having a linear thermal expansion coefficient of 92 (× 10 ^-7 / ° C)
Alloy was used. The metal plate thickness is 0.1 mm, the formed dot pitch is 0.2 mm in both length and width, and the hole size is 0.15 x 0.15 mm.
A large number of holes were formed by etching to obtain a grid-shaped metal plate.

As the dielectric material, softening point 600 ℃, average particle size 2-3μ
m of ZnO-B ₂ O ₃ -SiO ₂ based glass powder, and Al ₂ O _3, FeO · C
An inorganic filler such as r ₂ O ₃ was used. The deposition of the dielectric substance is the same material as the grid metal plate used as the anode in the electrodeposition liquid,
Electrodeposition was performed using a metal plate having a similar area as a cathode. The working voltage was fixed at -200V DC.

As a result, the electrodeposition state and the electrodeposition layer strength were also very good.

This sample is fired in the air at a temperature higher than the softening point of glass powder of 600 ° C, and the dielectric layer is made into a dense film to obtain a lattice-like dielectric composite with an electrodeposition layer thickness of 10 μm. It was

For the striped dielectric, Fort Insulator (manufactured by Tokyo Ohka Kogyo Co., Ltd.) was used to form a dielectric layer having a film thickness of 30 μm, a pitch of 0.2 mm and a line width of 50 μm on the back glass plate.

Next, as shown in FIGS. 1 and 2, a lattice-shaped dielectric material 2 and a stripe-shaped dielectric material 3 are sandwiched between a front glass plate 1 and a rear glass plate 4 to form a cell partition wall and a low melting point. After sealing with a glass frit, evacuation and gas filling through the tip tube, the tip tube was sealed off to prepare a DC type PDP. This DC type PDP, as shown in FIGS.
The front glass plate 1 is provided with an anode 5, and the inner surface of the front glass plate 1 is coated with a phosphor 7. on the other hand,
A cathode 6 is provided on the rear glass plate 4. And
The anode 5 and the cathode 6 are orthogonal to each other to form a dot matrix. Number of dots formed in this way 10
0 × 100 DC type PDP was obtained. The enclosed gas is He-Xe.
(2%) 300 Torr was used.

Example 2 As the lattice-shaped dielectric, the same lattice-shaped dielectric composite as in Example 1 was used.

The dielectric stripe shape used after kneading vehicle 20 parts by volume of the mixed powder 100 parts by volume of the ZnO-B ₂ O ₃ -SiO ₂ -based glass component and Al ₂ O ₃ and FeO-Cr ₂ O ₃ Then, a dielectric layer having a pitch of 0.2 mm and a forming line width of 50 μm was formed by screen printing. Multilayer printing up to 3 times, film thickness of 30μ after firing
m was obtained.

Next, in the same manner as in Example 1, seal with a glass frit and apply DC.
Created a PDP.

Comparative Example 1 The same lattice-shaped dielectric composite as in Example 1 was used as the lattice-shaped dielectric. This thickness was 0.1 mm.

Next, as a method of securing the gas introduction holes, when the above-mentioned grid shape is sandwiched between two glass sheets, a spacer slightly thicker than the grid shape is arranged outside the area of the grid-shaped partition wall so that the partition wall and the glass plate can be secured. A gap was formed between them. As the spacer, a frame-shaped plate glass surrounding the periphery of the lattice-shaped partition wall was used. The plate glass frame is specifically about the width
The one having a thickness of 5 mm and a thickness of 0.13 mm was used.

Next, in the same manner as in Example 1, seal with a glass frit and apply DC.
Created a PDP.

Comparative Example 2 As the lattice-shaped dielectric, the same lattice-shaped dielectric composite as in Example 1 was used. This thickness is 0.1 mm.

Next, as a method of securing the gas introduction hole, of the two plate glasses sandwiching the grid-like partition wall, only the back plate has a thickness of 0.2 mm.
Pitch-striped grooves were formed. That is, a groove with a width of about 50 μm and a depth of about 30 μm is formed near the center of the cell,
Gas was allowed to spread throughout the PDP. Grooving is
Since a large number of fine pitches are performed with a very narrow width and a high definition pitch, the manufacturing yield is low, and the cost is high, which is not suitable for mass production.

Next, sandwich the grid-shaped dielectric composite between the front plate and the grooved back plate and seal with a glass frit to form a DC type PDP.
It was created.

Experimental Example With respect to the DC type PDPs obtained in Examples 1 and 2 and Comparative Examples 1 and 2, adaptability to high definition (dot pitch 0.2 m
m), workability, uniformity of discharge voltage characteristics (unevenness of discharge gap) and crosstalk characteristics were evaluated, and the results are shown in Table 1. The evaluation symbols in Table 1 are as follows.

◎: Very good ○: Slightly excellent △: Slightly inferior ×: Inferior Also, the uniformity of the discharge voltage characteristics was evaluated by the unevenness of the discharge gap at a driving voltage of 280 V, and the crosstalk characteristics were evaluated. Was evaluated by the presence / absence of crosstalk to adjacent cells when every other cell is selectively emitted in the upper, lower, left and right directions.

As shown in Table 1, Examples 1 and 2 give good results in all evaluation items, while Comparative Example 1 is inferior in uniformity of discharge voltage characteristics and crosstalk characteristics, and Example 2 is inferior in adaptability to high definition and processability.

[Advantages of the Invention] As described above, the PDP of the present invention having the cell partition wall formed by superposing the lattice-shaped dielectric and the striped dielectric on each other has a high-definition pitch and is excellent in workability. The effect that the discharge voltage characteristics are uniform and the crosstalk characteristics are also excellent.

[Brief description of drawings]

Fig. 1 is a PDP component and assembly diagram, and Fig. 2 is a structural sectional view of one cell of the PDP. 1: Front glass plate, 2: Lattice-shaped dielectric, 3: Striped dielectric, 4: Rear glass plate, 5: Anode, 6: Cathode, 7: Phosphor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideyuki Asai 5 Nagaike, Nagakute Town, Aichi-gun, Aichi Prefecture (56) References JP-A-62-219438 (JP, A)

Claims (1)

[Claims] 1. An AC type or DC type gas discharge panel for performing dot matrix display having a cell partition formed by stacking a lattice-shaped dielectric and a stripe-shaped dielectric, wherein the lattice-shaped dielectric is used. Is a grid-shaped metal composite plate formed by etching, and a grid-shaped dielectric composite in which a 1 to 100 μm dielectric is deposited by electrodeposition on the surface, and the stripe-shaped dielectric is screen-printed with glass paste. The pattern is formed by printing or development of a photosensitive glass paste, and the film thickness is 5 to 150μ.
AC type or DC type gas discharge type panel characterized by being m.