JP2001266755A - Back plate for plasma display panel, method of manufacturing the same, and plasma display panel - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To simultaneously increase the strength of a partition, the reflectance of light, and the contrast of display. SOLUTION: A plurality of black partition walls 6 are formed on a main surface of a glass substrate 1 so as to separate a plurality of address electrodes 2 from each other.
Is provided. A white reflective film 7 having high reflectivity is provided so as to cover the main surface of the address electrode 2 and the glass substrate 1 and also cover the side surfaces of the partition 6. The top surface of the partition 6 is exposed without being covered by the reflective film 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back plate for a plasma display panel, a method for manufacturing the same, and a plasma display panel, and more particularly to a method for simultaneously increasing the strength of a partition, light reflectance, and display contrast. Regarding improvement.

[0002]

2. Description of the Related Art Plasma display panels (hereinafter, referred to as plasma display panels)
"PDP") is a pair of front and back plates,
This is a self-luminous display panel in which a discharge space is formed inside by opposing each other at a minute interval and sealing the periphery. This PDP is expected to be used as a display panel of a personal computer, an office workstation, or a wall-mounted television which is expected to develop in the future.

FIG. 7 shows a conventional AC which is the background of the present invention.
It is a sectional perspective view showing the structure of the type back plate for PDPs. In the back plate 150 for PDP, a plurality of linear address electrodes 2 are provided in parallel on the main surface of the glass substrate 1, and the main surface of the glass substrate 1 and the address electrodes 2 are formed of a white reflective film 3. Covered. The reflection film 3 is provided to prevent electromigration between the address electrodes 2 and to improve the reflectance of the back panel 150 for PDP.

[0004] Between the address electrodes 2, a plurality of partition walls 4 are provided parallel to each other, linearly, and at equal intervals so as to separate them. Back panel 150 for PDP
And a front plate (not shown)
The discharge space formed inside P is partitioned by the partition walls 4. Thereby, prevention of discharge interference and color crosstalk is achieved. The height of the partition 4 is 100 μm
The upper layer of the partition 4 has a partition upper part 5 mixed with a black pigment in order to improve the contrast of image display.

[0005] Although not shown, on the reflection film 3,
A fluorescent film (phosphor) that emits light upon discharge is formed.

FIGS. 8 to 12 are manufacturing process diagrams showing a method for manufacturing the back plate 150 for PDP. Back panel 15 for PDP
In order to manufacture the address electrodes 0, first, a plurality of parallel and linear address electrodes 2 are formed on the main surface of the glass substrate 1 by using, for example, screen printing (FIG. 8).
Next, a reflective film 3 is provided so as to cover the main surface of the substrate 1 and the address electrodes 2 (FIG. 9).

Next, a plurality of partitions 14 are provided on the reflective film 3 in parallel, linearly and at equal intervals so as to separate the address electrodes 2 from each other (FIGS. 10 to 1).
1). The partition wall 14 is formed by stacking a plurality of layered bodies each made of a low-melting glass paste, for example, using a screen printing method (laminated printing method). After a white layer is stacked up to a certain layer, for example, up to about seven layers (FIG. 10), a black layer mixed with a black pigment is stacked in about two layers, whereby the partition wall upper part 15 is formed. (FIG. 11). Thereby, the black and white two-color partition wall 1 having a total of about nine layered bodies.
4 are formed. Then, by performing thermal firing,
The glass paste solidifies to form black and white two-color partitions 4 having black partition upper portions 5 (FIG. 12). Thereafter, a fluorescent film (phosphor) not shown is formed on the reflective film 3.

[0008] The screen printing method is a typical method for forming the partition walls 4. Instead of this method, the partition walls 4 may be formed by other methods such as a sand blast method, a lift-off (additive) method, a press molding method, and a photosensitive paste method. Is formed, the conventional back plate for PDP is also similar to that shown in FIG.
Finished shape shown by.

[0009]

The partition wall 4 has the following characteristics: (1) It naturally plays a role of a partition wall for keeping a front plate (not shown) and the substrate 1 at a fixed distance, and also has a chipping or cracking. It is required to have sufficient intensity to prevent the occurrence of (2), (2) to maintain a high light reflectance, and (3) to be able to increase the contrast of image display.

However, the conventional PDP back plate 150
Since the partition walls 4 are formed in the shape shown in FIG. 7 or FIG. 12, for example, a slight pattern shift due to screen printing on the side surfaces of the partition walls 4 or a minute surface due to a blast agent used in a sand blasting process or the like. There is a problem that roughness occurs and the light reflectance decreases. Further, since it is necessary to maintain the strength of the partition 4, a material having a high reflectivity, such as titania (TiO 2) or zirconia (ZrO), is positively mixed into the material of the partition 4, and the reflection on the side surface of the partition 4 is performed. There was a problem that it was difficult to increase the rate. Furthermore, the upper part 5 of the partition wall provided to enhance the contrast of the image display has a problem that the reflectance of the partition wall 4 is low because not only the surface of the top part but also the side surface is black.

The present invention has been made in order to solve the above-mentioned problems in the prior art, and has been made in consideration of the strength of the partition,
It is an object of the present invention to provide a back plate for a plasma display panel capable of simultaneously increasing light reflectance and display contrast, a method for manufacturing the same, and a plasma display panel.

[0012]

According to a first aspect of the present invention, there is provided a back plate for a plasma display panel, comprising a substrate having a main surface, a plurality of address electrodes laid on the main surface, and a plurality of address electrodes. A side wall of the partition wall, the address electrode, and a reflective film covering the main surface, such that a dark partition wall laid on the main surface so as to separate the address electrodes from each other and a top surface of the partition wall are exposed. Is provided.

According to a second aspect of the present invention, in the back plate for a plasma display panel according to the first aspect, the reflection film contains at least one selected from the group consisting of titania and zirconia.

A device according to a third aspect of the present invention is a plasma display panel comprising a front plate and a rear plate combined so as to face each other, and the rear plate for the plasma display panel according to the first or second invention. It has a back plate.

A manufacturing method according to a fourth aspect of the present invention is a method for manufacturing a back plate for a plasma display panel, comprising: (a) preparing a substrate having a main surface; and (b) providing a plurality of addresses on the main surface. Laying electrodes and (c) laying dark partitions on the main surface so as to separate the plurality of address electrodes from each other; and (d) covering the partitions, the address electrodes, and the main surface. (E) polishing the reflective film so that the top surface of the partition wall is exposed.

According to a fifth aspect of the present invention, in the method of manufacturing a back panel for a plasma display panel of the fourth aspect, the reflection film contains at least one selected from the group consisting of titania and zirconia.

According to a sixth aspect of the present invention, in the method of manufacturing a back panel for a plasma display panel according to the fourth or fifth aspect, the step (d) is performed by the step (d-1). The method includes a step of applying a material, and the manufacturing method further includes a step of solidifying the material of the reflective film by performing thermal firing after (f) the step (e).

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION
This will be described with reference to the drawings. FIG. 1 shows A according to the embodiment.
It is a sectional perspective view showing the structure of the back plate for C type PDPs.
In the back panel 100 for PDP, a plurality of linear address electrodes 2 are arranged on the main surface of the glass substrate 1 in parallel with each other.

On the main surface of the glass substrate 1, a plurality of partition walls 6 are further provided parallel to each other, linearly and at equal intervals so as to separate the plurality of address electrodes 2 from each other. The partition walls 6 are dark in order to increase the contrast of the image display, and are preferably black. As a material of the partition 6, for example, like the upper part 5 of the partition (FIG. 7) of the back plate 150 for the conventional PDP, the melting point is lower than that of the glass substrate 1,
Low melting glass mixed with black pigment is used.

By combining a PDP back plate 100 with a front plate (not shown), a discharge space formed inside the PDP is partitioned by partition walls 6. Thereby, interference of discharge and crosstalk of colors are prevented.
The partition 6 is also sandwiched between the front plate and the substrate 1 and serves to keep them at a fixed distance. The height of the partition 6 is about 100 μm to 200 μm, and this height defines the distance between the front plate and the substrate 1.

A light-color reflective film 7 having a high reflectivity is provided so as to cover the address electrodes 2 and the main surface of the glass substrate 1 and also to cover the side surfaces of the partition walls 6. The reflection film 7
It is preferably white, and more preferably contains one or both of titania (TiO2) and zirconia (ZrO) which are high reflectivity materials. The top surface of the partition wall 6 is exposed without being covered by the reflective film 7. The reflection film 7 is provided to prevent electromigration between the address electrodes 2 and to improve the reflectance of the back panel 100 for PDP. Although not shown, a fluorescent film (phosphor) that emits light in response to discharge is formed on the reflective film 7.

Since the top surface of the partition 6 is not covered with the reflective film 7, the effect of improving the contrast of the image display by the partition 6 is not hindered. Further, since the side surface of the partition 6 is covered with the reflection film 7, the light reflectance is maintained high even though the partition 6 is dark. Further, the conventional PDP back plate 15
Unlike FIG. 0 (FIG. 7), only the top surface of the partition 6 is covered with the light-colored reflective film 7 because only the top surface is dark and the sides are covered with the light-colored reflective film 7
High reflectivity is obtained.

Further, even if a slight amount of pattern shift or minute surface roughness occurs on the side surface of the partition 6, they are covered with the reflection film 7, so that the influence is eliminated and the light reflectance is increased. Can be held. In addition, by using a material containing a high reflectivity material such as titania (TiO2) or zirconia (ZrO) for the material of the reflection film 7, the strength is sufficiently high so that the partition 6 is not chipped or cracked. While maintaining a high reflectance.

2 to 6 are manufacturing process diagrams showing a method for manufacturing the back plate 100 for PDP. Back panel 100 for PDP
First, a plurality of parallel and linear address electrodes 2 are formed on the main surface of the glass substrate 1 by using, for example, screen printing (FIG. 1).

Next, a plurality of partition walls 16 are provided on the main surface of the glass substrate 1 in parallel, linearly and at equal intervals so as to separate the address electrodes 2 from each other (FIGS. 3 to 3).
(Fig. 4). The partition walls 16 are formed by stacking a plurality of layered bodies each made of a low-melting glass paste, for example, using a screen printing method (laminated printing method) (FIG. 3). A black pigment is mixed in the glass paste, and the partition walls 16 are formed in a dark color, preferably black. Thereafter, by performing thermal firing, the glass paste is solidified to form dark, preferably black, partition walls 6 (FIG. 4).

In order to form the partition 6, instead of the screen printing method, a sand blast method, a lift-off (additive)
It is also possible to use other methods such as a press method, a press molding method and a photosensitive paste method. With either method,
The structure shown in FIG. 4 is completed.

Thereafter, a light-colored reflection film 7 is formed so as to cover the entire surface of the structure shown in FIG. 4, that is, to cover the partition 6, the address electrode 2, and the main surface of the glass substrate 1 (FIG. 4). (Fig. 5). The reflective film 7 is preferably white, and more preferably contains one or both of titania (TiO2) and zirconia (ZrO), which are high reflectivity materials. By this step, the top surface of the partition 6 is also reflected on the reflection film 7.
Is covered by part 17 of the That is, the entire surface of the structure is lightened or whitened.

In this process, even if there is a slight pattern shift due to screen printing on the side surface of the partition wall 6 or a minute surface roughness caused by a blast agent used in the sand blasting process, it is covered by the reflective film 7. By using a paste material, particularly a paste material having a low viscosity, as the material of the reflective film 7, it is possible to more smoothly cover the roughness of the side surfaces of the partition walls 6, and particularly to realize a high reflectance. .

Next, by polishing only the top of the partition 6, a part 17 of the reflection film 7 remaining on the top surface is polished.
Is removed. Thereby, the surface of the partition 6 is exposed only on the top surface. Subsequently, when the entire structure is heated, the reflection film 7 is thermally baked and solidified (FIG. 6). After the step of FIG. 6, a not-shown fluorescent film (phosphor) is formed on the reflective film 7. The process itself of forming the fluorescent film is well known in the art, and thus the description is omitted.

Through the above steps, the PDP back plate 10
0 is completed. Furthermore, the completed back plate for PDP 100
Then, a PDP is completed by combining PDP front plates (not shown) so as to face each other. PDP
The structure of the front panel is well known in the art, and a description thereof will be omitted.

[0031]

According to the back plate for PDP according to the first invention,
Since the partition walls are dark and the top surface is exposed and the side surfaces are covered with the reflective film, high image display contrast, high light reflectance, and high mechanical strength of the partition walls are simultaneously realized in parallel.

In the PDP back plate according to the second aspect of the present invention, since the reflection film contains a high-reflectance material, the reflectance is further improved.

In the PDP according to the third aspect of the present invention, since the PDP back plate according to the first or second aspect of the invention is provided, high contrast of image display, high light reflectance, and high mechanical strength of partition walls are simultaneously paralleled. Realized

In the manufacturing method according to the fourth aspect of the present invention, it is possible to easily manufacture a back panel for a PDP which simultaneously realizes high image display contrast, high light reflectance, and high partition wall mechanical strength in parallel. .

In the manufacturing method according to the fifth aspect of the present invention, since the reflection film contains the high-reflectance material, it is possible to manufacture a PDP back plate having a higher light reflectance.

In the manufacturing method according to the sixth aspect of the present invention, since the reflection film is formed by applying a paste-like material, not only the formation of the reflection film is easy, but also the fine irregularities on the side surfaces of the partition walls are reflected. The film can be easily covered and hidden, and the reflectance can be further increased.

[Brief description of the drawings]

FIG. 1 is a sectional perspective view of a PDP back plate according to an embodiment.

FIG. 2 is a manufacturing process diagram of the PDP back plate of the embodiment.

FIG. 3 is a manufacturing process diagram of the PDP back plate according to the embodiment.

FIG. 4 is a manufacturing process diagram of the PDP back plate of the embodiment.

FIG. 5 is a manufacturing process diagram of the PDP back plate of the embodiment.

FIG. 6 is a manufacturing process diagram of the PDP back plate of the embodiment.

FIG. 7 is a sectional perspective view of a conventional PDP back plate.

FIG. 8 is a manufacturing process diagram of a conventional PDP back plate.

FIG. 9 is a manufacturing process diagram of a conventional PDP back plate.

FIG. 10 is a manufacturing process diagram of a conventional PDP back plate.

FIG. 11 is a manufacturing process diagram of a conventional PDP back plate.

FIG. 12 is a manufacturing process diagram of a conventional PDP back plate.

[Explanation of symbols]

1 glass substrate (substrate), 2 address electrodes, 6 partition, 7 reflective film.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Manabu Akiha 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5C027 AA05 AA09 5C040 FA01 FA04 GB03 GB14 GD07 GD09 GF02 GF18 GF19 JA12 KA10 KB15 MA02 MA03 MA09 MA23

Claims (6)

[Claims] A substrate having a main surface; a plurality of address electrodes laid on the main surface; and a dark partition wall laid on the main surface so as to separate the plurality of address electrodes from each other. A back panel for a plasma display panel, comprising: a reflective film covering a side surface of the partition, the address electrode, and the main surface such that a top surface of the partition is exposed. 2. The back plate for a plasma display panel according to claim 1, wherein the reflection film contains at least one selected from the group consisting of titania and zirconia. 3. A plasma display panel comprising a front plate and a back plate combined so as to face each other, and the back plate for a plasma display panel according to claim 1 or 2 as the back plate. 4. A step of preparing a substrate having a main surface, a step of laying a plurality of address electrodes on the main surface, and a step of separating the plurality of address electrodes from each other. Laying a dark partition on the main surface, (d)
A plasma comprising: a step of forming a reflective film so as to cover the partition, the address electrode, and the main surface; and (e) a step of polishing the reflective film so that a top surface of the partition is exposed. A method for manufacturing a rear panel for a display panel. 5. The method according to claim 4, wherein the reflection film contains at least one selected from the group consisting of titania and zirconia. 6. The method according to claim 6, wherein the step (d) includes a step (d-1) of applying a material for the reflective film in the form of a paste. The method for manufacturing a back plate for a plasma display panel according to claim 4, further comprising a step of solidifying the material of the reflection film by performing baking.