JPH0694381B2 - Manufacturing method of condenser lens plate for gas discharge display panel - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of manufacturing a condenser lens plate which is used by incorporating it in a gas discharge display panel in order to improve the display brightness of the panel. The present invention relates to a method of manufacturing a condenser lens plate for a gas discharge display panel in which a condenser lens is formed in a portion corresponding to a discharge cell by etching a transparent substrate.

[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 to form an airtight envelope, and in the airtight envelope, It 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 portion of the cathode and the anode, and the discharge cells are arranged in a predetermined pattern according to the type of the glass discharge display panel.

Thus, when a voltage is selectively applied between the cathode and the anode, the discharge cell in the portion where the selected cathode and anode face each other is discharged, and the light emission is emitted to the outside through the front substrate, and the desired light is emitted. Display pattern is formed.

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

The present invention has been devised in view of the above points, and is used by being incorporated in a panel to collect light from a discharge cell and suppress diffusion of the light inside the front substrate. An object is to realize a method for manufacturing a lens plate.

[Means for Solving the Problem] In order to achieve the above object, a method of manufacturing a condenser lens plate for a gas discharge display panel according to the present invention is a resist having a pattern corresponding to a discharge cell array pattern of the gas discharge display panel. A layer is formed on a transparent substrate, the transparent substrate is immersed in an etching solution for etching using the resist layer as a mask, the resist layer is removed, and the transparent substrate is made to have a low concentration with the same components as the etching solution. The transparent substrate is immersed in a polishing liquid to chemically polish the surface of the transparent substrate to form a condenser lens at the portion corresponding to the discharge cell.

[Operation] Since the method of the present invention has the above-described configuration, the peripheral portion of the transparent substrate where the resist layer is not formed and the peripheral portion where the resist layer is formed are etched to form the resist layer. The central part of the open part remains as a protrusion. Then, after removing the resist layer, the transparent substrate is immersed in a polishing liquid containing the same component as the etching liquid and having a low concentration to chemically polish the surface of the transparent substrate, thereby abrading the corners of the protrusions. As a result, a convex condenser lens is formed on a portion of the transparent substrate corresponding to the discharge cell, and the surface of the transparent substrate roughened by etching is smoothed to improve the transparency.

When the condenser lens plate is arranged between the discharge cell of the gas discharge display panel and the front substrate, the light from the discharge cell is condensed by the condenser lens formed on the transparent substrate. And is incident on the front substrate, and is emitted to the outside with almost no diffusion inside the substrate.

[Examples] Hereinafter, a method of manufacturing a condenser lens plate for a gas discharge display panel according to an example of the present invention will be described with reference to the drawings.

Example 1 This example is applied to a dot matrix type gas discharge display panel, and its manufacturing process is shown in FIGS. 1 (A) to 1 (E).

When manufacturing the condenser lens plate 1 for a gas discharge display panel, first, as shown in FIGS. 1 (A) and 1 (B), a thickness of 0.2
Resist layers 3a and 3b are formed on both surfaces of the transparent substrate 2 made of thin glass of about 0.4 mm to a pattern corresponding to the discharge cell array pattern of the gas discharge display panel. That is, a resist layer 3a, 3b is formed by applying a photosensitive etching resistant material such as polybiphenyl alcohol resin to a dot matrix having a dot diameter of 0.4 to 0.6 mm and a dot pitch of 0.6 to 0.8 mm by means of screen printing or the like. Form. In this case, since the condenser lens plate 1 is arranged in the immediate vicinity of the part where discharge occurs, the material of the transparent substrate, which is its constituent material, needs to be inorganic. Optimal.

Next, the transparent substrate 2 on which the resist layers 3a and 3b are formed
Is immersed in an etching solution such as hydrofluoric acid for chemical etching. Since the etching action of chemical etching has an isotropic property, if the overetching is intentionally performed, the transparent substrate 2
Not only the portion where the resist layers 3a and 3b are not formed, but also the etching action from the lateral direction to the portion where the resist layers 3a and 3b are formed, both surfaces of the portion corresponding to the discharge cell in the substrate. The projections 4a, 4b having a substantially trapezoidal cross section as shown in FIG.

After that, the resist layers 3a and 3b of the transparent substrate 2 are removed by xylene or the like, and further immersed in a polishing liquid containing hydrofluoric acid or the like having a lower concentration than the above etching liquid to chemically polish. ) And (E), the corners of the protrusions 4a and 4b are worn away to form convex condenser lenses 5a and 5b having the same focal length on both surfaces of the substrate 2 and are roughened by etching. The surface of the substrate 2 becomes smooth and the transparency is improved.

When manufacturing the condenser lens plate 1, the transparent substrate 2
Thickness and the dot diameter of the resist layers 3a and 3b, and by appropriately setting the etching degree of the substrate 2 by selecting the etching solution concentration, temperature, etching time, etc., the thickness diameter suitable for the gas discharge display panel to be used. It is possible to obtain the condenser lenses 5a and 5b having the focal lengths.

As shown in FIG. 2, the condensing lens plate 1 for a gas discharge display panel has a discharge gap in an airtight container formed by facing a front substrate 6 and a rear substrate 7 made of glass plates at a predetermined interval. Is disposed between the front substrate 6 and the cathode 8 in the gas discharge display panel 10 which is formed by enclosing a plurality of cathodes 8 and anodes 9 that are arranged orthogonally to each other together with a discharge gas.

Then, when a voltage is applied between the selected cathode 8 and anode 9, the discharge cell 11 formed between both electrodes 8 and 9 is discharged,
The light is condensed by the condenser lenses 5a and 5b of the condenser lens plate 1, enters the front substrate 6, and is emitted to the outside.

[Embodiment 2] FIG. 3 shows another embodiment of the present invention, in which condenser lenses 5a and 5b are formed on the upper surface and the lower surface of the transparent substrate 2, respectively.
The diameters of the two are different, and the focal lengths are different from each other.

In this embodiment, as shown in FIG. 3 (A), first, a large dot resist layer 3a is formed on the upper surface of the transparent substrate 2, and a resist layer 3b having a small dot diameter is formed on the lower surface in a matrix. This is subjected to chemical etching to form large-diameter projections 4a and small-diameter projections 4b on the upper and lower surfaces of the transparent substrate 2, respectively, as shown in FIG. 3 (B). Next, after removing the resist layers 3a and 3b formed on the transparent substrate 2, chemical polishing is performed to chamfer the projections 4a and 4b and make them transparent, and a large-diameter convex condenser lens is provided on the upper surface of the substrate 2. 5a, a small diameter convex condenser lens 5b is formed on the lower surface.

[Embodiment 3] FIG. 4 shows still another embodiment of the present invention in which the condenser lens 5a is formed only on the upper surface of the transparent substrate 2.

In this embodiment, as shown in FIG. 4 (A), first, the dot-shaped resist layer 3a is formed in a matrix on the upper surface of the transparent substrate 2, and the entire lower surface of the transparent substrate 2 is covered with the resist layer 3b. Cover with. Then, this is chemically etched to form protrusions 4a on the upper surface of the transparent substrate 2 as shown in FIG. 4 (B). After that, if the resist layers 3a and 3b are removed and the projections 4a are chamfered and made transparent by chemical polishing, a convex condenser lens 5a is formed on the upper surface of the transparent substrate 2.

[Embodiment 4] In the embodiment described above, the method of manufacturing the condenser lens plate used in the dot matrix type discharge display panel has been described, but this example is suitable for the bar graph type gas discharge display panel. To do.

In the case of the present embodiment, first, a stripe-shaped resist layer is formed on the upper surface of the transparent substrate 2, the entire lower surface is covered with the resist layer and chemically etched, and then the resist layer is removed and chemically polished. As shown in the figure, a condenser lens plate 1 in which a large number of kamaboko-shaped condenser lenses 5a are arranged in parallel on the upper surface of a transparent substrate 2 is obtained.

[Effects of the Invention] As described in detail above, in the method of manufacturing a condenser lens plate for a gas discharge display panel of the present invention, the periphery of the transparent substrate where the resist layer is not formed and where the resist layer is formed is used. The part is etched and the central part of the part where the resist layer is formed remains as a protrusion. Then, after removing the resist layer, the transparent substrate is immersed in a polishing liquid containing the same component as the etching liquid and having a low concentration to chemically polish the surface of the transparent substrate, thereby abrading the corners of the protrusions. As a result, a convex condenser lens can be formed on a portion of the transparent substrate corresponding to the discharge cell, and the surface of the transparent substrate roughened by etching can be smoothed to improve the transparency. Further, a desired condenser lens plate can be easily obtained only by appropriately selecting the thickness of the transparent substrate, the pattern shape of the resist layer and the etching conditions. When the condenser lens plate manufactured by the method of the present invention is incorporated between the front substrate and the cathode of the gas discharge display panel, the light from the discharge cell is emitted to the outside with almost no loss. It is possible to improve the display brightness of the discharge display panel.

[Brief description of drawings]

FIG. 1 shows an embodiment of the method of the present invention. FIGS. 1 (B) to 1 (D) are sectional views for explaining the manufacturing process, and FIGS. 1 (A) and 1 (E) are FIG. 2 is an exploded perspective view showing a state in which a condenser lens plate is incorporated in a gas discharge display panel, and FIG. 3 (A) to FIG. FIG. 4C is a cross-sectional view for explaining the manufacturing process of another embodiment, and FIG.
8A to 8C are cross-sectional views for explaining the manufacturing process of still another embodiment, and FIG. 5 is a perspective view showing an example of the shape of the condenser lens plate. 1 ... Condensing lens for gas discharge display panel, 2 ... Transparent substrate, 3a, 3b ... Resist layer, 4a, 4b ... Protrusion, 5a, 5b ...
Condenser lens, 10 ... Gas discharge display panel, 11 ... Discharge cell.

Claims (7)

[Claims] 1. A resist layer having a pattern corresponding to a discharge cell array pattern of a gas discharge display panel is formed on a transparent substrate, and the transparent substrate is immersed in an etching solution for etching using the resist layer as a mask, and then the resist is formed. The layer is removed, and the transparent substrate is further immersed in a polishing liquid containing the same composition as the etching liquid and having a low concentration to chemically polish the surface of the transparent substrate to form a condenser lens on the portion corresponding to the discharge cell. A method of manufacturing a condenser lens plate for a gas discharge display panel, comprising: 2. A method of manufacturing a condenser lens plate for a gas discharge display panel according to claim 1, wherein condenser lenses are formed on both surfaces of the transparent substrate. 3. A method of manufacturing a condenser lens plate for a gas discharge display panel according to claim 2, wherein the focal lengths of condenser lenses formed on both surfaces of the transparent substrate are made equal to each other. . 4. The production of a condenser lens plate for a gas discharge display panel according to claim 2, wherein the focal lengths of condenser lenses formed on both sides of the transparent substrate are different from each other. Method. 5. The method of manufacturing a condenser lens plate for a gas discharge display panel according to claim 1, wherein a condenser lens is formed on one surface of the transparent substrate. 6. The light condensing display panel according to any one of claims 1 to 5, wherein the resist layer is formed in a pattern in which a plurality of dots are arranged in a matrix. Lens plate manufacturing method. 7. The resist layer is formed in a pattern in which a plurality of bands are arranged in parallel.
Item 8. A method for manufacturing a condenser lens plate for a gas discharge display panel according to any one of items 5 to 5.