JPS62195829A - Method of forming spacer of gas discharge panel - Google Patents

Abstract

PURPOSE:To improve the forming accuracy by print-forming an insulator layer in lamination of at least 2 layers, using a thin screen printing mask for the first layer and thick screen printing layer for the second layer and the rest, on dielectric layers of both substrates. CONSTITUTION:On dielectric layers 5, 6 covering multiple electrodes 3, 4 arranged on substrates 1, 2 for the respective panels, low melting point glass layers 21a, 22a for the forming of 1st spacer layer are formed with good pattern width accuracy by means of screen printing of small mesh number and thin stencil film making the mask, and are then dried. Glass layers 21b, 22b, of a similar linear pattern and thickness as large as possible to the extent that no drooping occurs in the applied low melting point glass layer for the forming of spacer, are formed on the lower melting point glass layers 21a, 22a for the forming of 1st spacer layer, and then dried. Further on these layers, thick spacers 21, 22 consisting of low melting point glass layers of specified dimensions and shapes are formed in lamination. By this process, linear pattern of good width accuracy and relatively large thickness can easily be formed in the specified dimensions and shapes.

Description

[Detailed Description of the Invention] [Summary] The present invention is a method for forming a thick film spacer for defining a gap in a gas discharge space of a gas discharge panel used in various display devices. An insulating material layer serving as a spacer is provided on the dielectric layer -1- covering the plurality of electrodes in a pattern that avoids the electrode facing gap, respectively.
Initially, a screen printing mask with a small mesh number and a thin stencil film is used, and from the second time onwards, a screen printing mask with a large mesh number and a thick stencil film is used to create at least two layers. By separately printing and forming the spacer in a laminated form, a relatively high (thick) thick film spacer of about 100 nm can be easily obtained with high accuracy and a predetermined pattern width without sagging.

[Industrial application field]

The present invention relates to a method of forming a spacer for defining the gap between the gas discharge spaces of gas discharge panels used in various display devices, and in particular, a thick film forming method may cause relatively tall (thick) spacers to sag. The present invention relates to a method of forming with high precision so as to avoid

A flat gas discharge panel known as a plasma display panel, for example, a counter-electrode discharge type gas discharge panel such as a 7-trisox type panel with a one-top display type, has a plurality of electrodes each covered with a dielectric layer on the surface. A structure in which a pair of substrates arranged with the above are placed facing each other with a predetermined gas discharge space in between, and a discharge gas is sealed in the predetermined gas discharge space while the periphery thereof is hermetically sealed with a sealing material. have.

The gas discharge characteristics of a gas discharge panel with such a structure vary greatly depending on the gap accuracy of the gas discharge space. In order to prevent discharges in discharge cells from being coupled between adjacent discharge cells, a pair of substrates each having a plurality of electrodes whose surfaces are covered with a dielectric layer are provided with gaps between the electrodes facing each other. The discharge gap is uniformly defined by forming a thick film spacer made of an insulating material layer in a linear pattern that avoids the discharge gap, and by interposing both spacers against each other between the opposing substrates.

However, if a thick film spacer like the one described in - is formed relatively thick, it tends to sag, and it is difficult to form a relatively tall (thick) thick film spacer with good precision without increasing the pattern width. There is a need for a method that can easily and accurately form a pattern with a specified width that requires such relatively thick film spacers.

[Conventional technology]

A conventional method for forming a thick film spacer for a gas discharge panel of the opposed electrode discharge type involves disposing a plurality of electrodes 3 and 4 each covered with a dielectric layer 5, 6 on the surface thereof, as shown in FIG. A linear pattern is formed on a pair of substrates 1 and 2 consisting of a plurality of dielectric layers 5.6 in a direction perpendicular to the plurality of electrodes 3.4, avoiding the opposing gaps between the electrodes 3.4. A thick film spacer 7.8 made of a low melting point glass layer is applied by a thick film forming method using screen printing and is formed by baking.

At this time, the thickness of each thick film spacer 7.8 is, for example, exactly half the gap defined in the predetermined gas discharge space between the opposing dielectric layers 5 and 6 of the pair of substrates 1.2. There is.

Therefore, the pair of panel boards configured as described above was
When stacked and assembled as shown in the figure, the thick film spacers 7 and 8 are partially abutted in a crossing state, and the gap between the predetermined gas discharge space is defined by the cross abutment of both spacers 7 and 8. ing.

[Problem that the invention seeks to solve]

By the way, when the above-described conventional thick film spacer 7.8 made of a low melting point glass layer is applied and formed by a thick film forming method using screen printing, the arrangement pitch is 0.3 mm.
The linear pattern width is 100 μm.

Dielectric layers 5 and 6 are formed by covering the electrodes 3.4 on each substrate 1.2 with a low melting point glass paste by screen printing.
When a low melting point glass layer was applied on top by screen printing using a low melting point glass paste for spacer formation,
There is a drawback that the low melting point glass layer tends to sag, and it is not easy to accurately form the thick film spacer 7.8 made of the low melting point glass layer with a specified size and shape.

In view of such conventional drawbacks, the present invention provides at least two
Using screen printing masks with different numbers of meshes and different thicknesses of stencil films constituting the masks, a thick film spacer made of a low melting point glass layer is laminated by screen printing at least two times or more. Therefore, it is an object of the present invention to provide a novel method for forming spacers for gas discharge panels, which enables the formation of thick film spacers made of a low-melting glass layer having a specified size and shape with high precision.

[Means for solving problems]

In order to achieve the above object, the present invention has a dielectric layer 5.4 covering the electrodes 3.4 of each panel substrate 1, 20, as shown in FIG. G1, both electrodes 3, 4 in a direction orthogonal to the plurality of electrodes 3, 4 covered with each dielectric layer 5.6, respectively.
In order to increase the pattern width viscosity of the thick film spacers 21 and 22 to be formed, for example, the number of meshes is small and the thickness of the stencil film constituting the mask is thin. The first layer of low melting point glass layer 2 for forming spacers has a thin film thickness with good pattern width accuracy by screen printing using the first screen printing mask.
]a, 22a is formed by coating.

Next, after drying, the first layer of low melting glass for spacer formation 121a, 22a, . The melting point glass layer is formed as thick as possible without sagging, for example, by screen printing using a second screen printing mask with a large mesoside number and a thick stencil film forming the mask. A relatively thick second spacer-forming low melting point glass layer 21b, 22b is formed by coating.

Thereafter, on the dry low melting point glass layers 21b and 22b for forming the spar 9' of the second l1ji1', a low melting point glass layer for forming the third layer spacer is similarly applied by screen printing using the second screen printing mask. Melting point glass layer 21 (1, 22
c is applied and formed, followed by drying and firing treatment to form a laminated thick film spacer made of a low melting point glass layer having a prescribed size and shape.

[For production]

In this way, the spacer forming method of the present invention can be used to form small
Types of mesonules and stencil films constituting the mask II - Using screen printing masks with different thicknesses, the initial screen printing pattern @ low melting point glass for forming the first layer spacer with a thin film thickness and good accuracy layer 21a,
22a is coated and formed 7, and relatively thick low melting point glass layers 21b, 22b, 21c, 22 for spacer formation are coated on ten sides thereof at least once.
Since the thick film spacer 9- is formed by laminating the thick glass layers 21b, 22b, 21c, 22c, etc., no sagging occurs when applying the thick spacer forming low melting point glass layers 21b, 22b, 21c, 22c, etc.
Linear pattern width is 100μm, height and thickness is 50μm
A thick film spacer made of a low melting point glass layer having a relatively high specified size and shape can be easily formed with high precision.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view of a main part for explaining an embodiment of the method for forming spacers in a gas discharge panel according to the present invention.

As shown in the figure, first, each dielectric layer 5.6-F is coated with a plurality of electrodes 3.4 disposed on each panel substrate Fi1.2''-. Thick film spacers 21 and 22 to be formed have parallel linear patterns in a direction perpendicular to the plurality of electrodes 3 and 4 covered with . In order to improve pattern width accuracy, the mesh number is as small as 300, and the thickness of the stencil film constituting the mask is, for example, 0.
By screen printing using a thin first screen printing mask and a thin first screen printing mask, a first layer of low melting point glass layers 21a and 22a for forming a spacer with a dry film thickness of, for example, 10 μm and good pattern width accuracy is formed by coating. Then continue drying.

Next, after drying, the first layer of low melting point glass for spacer formation 2+a, 22al has a linear pattern similar to the first screen printing mask and is coated with one low melting point glass for spacer formation. The glass layer can be formed as thick as possible without causing sag, for example, the number of meshes is as large as 200, and the thickness of the stencil film constituting the mask is, for example, 25.
By screen printing using a second screen printing mask as thick as μm, the film thickness after drying is relatively thick, e.g. 25 μm.
Low melting point glass Wi 2 for forming a spacer in the first layer of m
] +1 and 22b are applied and formed, and then dried.

Further, on the dried second layer of low melting point glass layers 21b and 22b for spacer formation, a third layer of low melting point glass layer for spacer formation is similarly applied by screen printing using the second screen printing mask. 21c.

22c is applied and formed, and then, after drying, a firing process is performed to form a thick film spacer 21, 22 made of a low melting point glass layer having a prescribed size and shape in a laminated manner.

In such a forming method, the accuracy of the pattern width of the thick film spacer 21, 22 is determined by the first low melting point glass layer 21a, 22a for spacer formation, and the upper surface thereof is coated at least once. Separately, low melting point glass layers for spacer formation, for example, 21b, 22b and 21c, are made as thick as possible without causing sag.

By sequentially laminating 22c, thick film spacers 21 and 22 made of a low melting point glass layer with relatively high specified dimensions and shape with a linear pattern width of 100 μm and a height (thickness) of 50 μm can be formed with high precision. It becomes possible to form it easily.

Therefore, by assembling the pair of panel substrates on which the thick film spacers 21, 22 are formed in this manner with the thick film spacers 21, 22 facing each other, as shown in FIG. The cross-abutment of the thick film spacers 21, 22 allows the gas discharge space to be precisely defined in a gap of a predetermined size.

In the above embodiments, a dielectric layer is formed by covering a plurality of electrodes. Secondly, parallel lines are formed in a direction orthogonal to the plurality of electrodes covered with the dielectric layer, avoiding gaps between opposing types. Although an example has been described in which a thick film spacer is formed in a pattern, the present invention is not limited to this example. For example, each of a plurality of electrodes covered with the dielectric layer is A similar effect can be obtained by forming thick film spacers in parallel linear patterns at positions facing each other between the electrodes, avoiding opposing gaps.

Furthermore, in the above embodiment, a thick film spacer is formed on each dielectric layer of both substrates forming a pair, and the gap between the gas discharge spaces is defined by both thick film spacers. For example, it is of course possible to form a tall thick film spacer that defines the gap between the gas discharge spaces only on the dielectric layer of one of the paired substrates, and the same effect can be obtained. It will be done.

〔Effect of the invention〕

As is clear from the above description, according to the method for forming spacers for a gas discharge panel according to the present invention, the thick film spacers that define the gap size of the gas discharge space are formed in a linear pattern with a pitch of about 0.3 ms + pitch. Good width accuracy and 100
It has the excellent advantage that it can be easily formed into a relatively high (thick) prescribed size and shape on the order of μ.

Therefore, it is extremely applicable not only to the type of gas discharge panel described in this embodiment, but also to various gas discharge panels that require thick film spacers with relatively high (thick) dimensions, as well as to flat liquid crystal display panels. It's advantageous.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part for explaining an embodiment of a method for forming a spacer for a gas discharge panel according to the present invention. FIG. 2 is a cross-sectional view of a main part showing a panel configuration using a thick film spacer according to the present invention. , FIG. 3 is a cross-sectional view of a main part for explaining a method of forming a spacer in a conventional gas discharge panel, and FIG. 4 is a cross-sectional view of a main part showing an intervening structure of a spacer in a conventional gas discharge panel. In Figures 1 and 2,

Claims (1)

[Claims] A pair of substrates (1, 2) each having a plurality of electrodes (3, 4) each covered with a dielectric layer (5, 6) on its surface.
A method for forming a spacer for defining a gap between the gas discharge spaces in a panel configuration in which: 6) Place spacers (21
, 22) using a screen printing mask with a small mesh number and a thin stencil film thickness.
A method for forming a spacer for a gas discharge panel, characterized in that from the second time onwards, a screen printing mask with a large mesh number and a thick stencil film thickness is used to print and form at least two or more layers in a laminated form.