JPH02242548A - Plasma display panel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention is directed to plasma display panels (hereinafter referred to as FD
It is called P. ), and particularly relates to the structure of a cell barrier constituting a display element cell.

[Prior Art] In an FDP, cells for display elements are formed by cell barriers, and the shape of the cell barrier may be a line shape as shown in FIG. 6 or a matrix shape as shown in FIG. It is broadly divided into things.

In FIG. 6, 1 is a back plate, and 2 is a front plate, each of which is made of a flat substrate such as glass. and,
A cathode 3 is formed on the back plate 1, an anode 4 is formed on the front plate 2, and a line-shaped cell barrier 5 forming a display element cell is further formed on the front plate 2.

The structure shown in FIG. 7 is substantially the same as that shown in FIG. 6 except that the cell barrier 15 is in a matrix shape.

Note that the cell barrier may be formed on the front plate as shown in FIG. 6, or may be formed on the back plate as shown in FIG. Further, in FIGS. 6 and 7, the phosphor is omitted.

[Problems to be Solved by the Invention] Cell barriers are generally formed of a black light-absorbing material in order to prevent reflection of external light and improve contrast. The barrier is 100~
Since a thickness of 200 μm is required, it is usually formed by overcoating several times by screen printing.

However, when the cell barrier is formed of a light-absorbing material, there is a problem in that light emitted within the cell barrier is absorbed by the cell barrier surface, resulting in poor luminous efficiency.

On the other hand, as shown in FIG. 8, a light absorption layer 2G is formed on the front plate 22 at a location facing the cell barrier 25 to prevent reflection of external light and improve contrast. It has been proposed that the barrier 25 be formed of a white light-reflecting material. According to this, the light emitted on the surface of the phosphor is reflected on the surface of the cell barrier 25, so that the light emission efficiency can be improved.

However, in the PDP shown in FIG. 8, the color filter 27 must be formed on the front plate 22, and the light absorption layer 26 must be further formed at a predetermined position of the color filter, so the number of manufacturing steps is large. Another problem is that alignment of the back plate 21 and front plate 22 is troublesome.

The present invention solves the above problems, and provides an FDP that is easy to manufacture and has good luminous efficiency and contrast.
The purpose is to provide the following.

[Means for Solving the Problems] - In order to achieve the object described in F, the plasma display panel of the present invention comprises a plurality of cells for display elements arranged in a 7-trix pattern. The cell barrier is characterized by having a two-layer structure with a light absorption layer on the viewer side and a light reflection layer on the other side.

[Operation and Effects of the Invention] In conventional cell barriers, monochrome FDPs absorb neon (Ne) gas light emission, and color PDPs absorb phosphor light emission, but in the FDP of the present invention, the cell barrier absorbs light emission. Since the side wall portion is a light reflecting layer, the emitted light is reflected on the surface of the cell barrier, so the loss of light amount is extremely reduced, and the luminous efficiency can be improved.

Furthermore, the light absorption layer formed on the viewer side of the cell barrier prevents reflection of external light, thereby improving contrast.

Furthermore, it is extremely easy to manufacture compared to an FDP using a white light reflecting material as a cell barrier, as shown in FIG.

In the case of the present invention, the light-absorbing layer need only be formed on the surface portion of the cell barrier facing the viewer, and the side surface of the barrier inside the cell is almost a light-reflecting layer, resulting in good luminous efficiency.

[Example code] Examples will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of one embodiment of the FDP according to the present invention, in which 31 is a back plate, 32 is a front plate, 33 is a cathode, 34 is an anode, 35 is a cell barrier, and 36 is a light source. Absorption layer, 3
7 is a light reflecting layer, and 38 is a phosphor.

FIG. 1(a) shows an example in which a cell barrier 35 is formed on the front plate 32, and the cell barrier 35 consists of a light absorption layer 36 and a light reflection layer 37.
A light absorbing layer 36 is formed on the front plate side, that is, on the viewer's side, and a light reflecting layer 37 is formed on the other part, that is, on the back plate 31 side.

Further, FIG. 1(b) shows an example in which the cell barrier 35 is formed on the back plate 31, and similar to that shown in FIG. 1(a), the cell barrier 35 is on the front plate 32 side, that is, on the observer's side. A light absorption layer 36 is formed thereon, and a light reflection layer 37 is formed on the other part, that is, on the back plate 31 side.

In addition, in FIGS. 1(a) and (b), the cell barrier 3
5 may be in the form of a line or a matrix.

Moreover, although what is shown in FIG. 1 is the configuration of a DC type FDP, it is clear that an AC type PDP can be constructed in the same way.

Furthermore, a monochrome FDP without a phosphor can also be used in the same manner.

The following two methods can be considered for manufacturing an FDP having the structure shown in FIG.

■First method First, as shown in FIG. 2(a), the light reflective layer 37 is formed in a predetermined shape on the back plate 31, and then, as shown in FIG. 2(b), the light reflective layer 37 is overlaid. A method of forming a light absorbing layer 36. Note that the configuration shown in FIG. 2 is for the PDP having the configuration shown in FIG. 1(b), but in the case of the configuration shown in FIG. 36 and then
A light reflecting layer 37 is formed overlapping the light absorbing layer 36.

When forming the cell barrier 35 in the following manner, the height of the cell barrier 35 needs to be about 100 to 200 μm, so it is preferable to form it using screen printing technology. The paste is composed of a glass frit, a binder, a solvent, a filler, and an additive, but when forming the light absorption layer 36, after removing the binder by baking, a pigment that will eventually become black is added. Furthermore, when forming the light reflecting layer 37, powders such as titanium oxide and magnesium oxide are mixed into the paste.

To make the cell barrier 35 have a height of 100 to 200 μm,
It is necessary to apply multiple layers by screen printing, but in this case, if the thickness of each layer is too thick, the paste will sag and cause a defective shape, so it is necessary to apply 10 to 2
The layers should be stacked to a thickness of about 0 μm.

Printing plates with the same pattern may be distributed to each paste, but the alignment will be complicated, so after stacking the printing plates using the same one, replace the paste with the light-reflecting layer → light-absorbing layer. It is better to apply layers or vice versa.

Due to the following two points, even though the cell barrier has a two-layer structure,
It can be easily performed in the same way as normal cell barrier formation.

■Second method First, as shown in FIG. 3(a), the light reflecting layer 37 is formed solidly on the back plate 31, and then the light absorbing layer 37 is formed as shown in FIG. 3(b).
is overlaid on the light reflective layer 37 and formed in a solid manner. Next, as shown in FIG. 3C, a photomask 40 having a predetermined cell barrier pattern is placed, and the cell portion 41 is etched by chemical etching or physical etching such as sandblasting.
After forming, the photomask 40 is removed as shown in FIG. 3(d) and FIG. 3(e). This allows the cell barrier 35 to have a predetermined shape.

In this case, a paste similar to that used in screen printing may be used as the paste. However, when performing chemical etching, if a PbO-based glass frit is used, it can be etched with nitric acid, making handling easier.

Another possible method is to form the light-reflecting layer 37 and then attach the light-absorbing layer 36 to the surface of the viewer's side. As shown in FIG. 4, there is a method in which the light-absorbing ink 42 is transferred to the surface of the light-reflecting layer 37 using a roller 43, and as shown in FIG. layer 37
During this period, a resist 45 is filled to almost the same height as the light reflecting layer (FIG. 5(b)), and then the light absorbing layer 36 is formed (FIG. 5(c)), and then FIG. 5(d). ) can be considered to remove the resist 45 as shown in FIG.

Although the above description is about the configuration of FIG. 1(b), it is clear that the same can be applied to the configuration of FIG. 1(a).

[Specific example: The cell shape is a matrix, and the cell barrier width is 200 μm1
The height was 120 μm, the pitch was 1 mm, and the cell space was 0.8 m, and overprinting was performed by screen printing.

#325 mesh was used. The film thickness after one coating was 20 μm, and magnesium oxide was mixed as a light reflecting layer to form a paste. A black pigment (iron oxide, cobalt oxide, chromium oxide) was mixed into the light absorption layer, and a paste was formed.

After five coats of the light reflective layer were applied to the substrate that would become the back plate, the paste was replaced and the light absorbing layer was coated once. then 55
It was baked at 0'C for 20 minutes to form a two-layer cell barrier with a height of 100 μm.

Next, we combined it with a front panel, filled it with gas, and actually emitted light, which yielded good results.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a configuration example of the FDP of the present invention, FIG. 2 is a diagram showing one manufacturing method of the FDP of the present invention, FIG. 3 is a diagram showing another manufacturing method of the present invention, and FIG. 4 is a diagram showing an optical FIG. 5 is a diagram showing one method of forming an absorption layer, FIG. 5 is a diagram showing another method of forming a light absorption layer, FIG. 6 is a diagram showing an example of the configuration of a monochrome PDP, and FIG. 7 is a diagram showing the configuration of another PDP. FIG. 8 is a diagram showing a configuration example of a reflective FDP. 31... Rear plate, 32... Front plate, 33... Cathode, 34... Anode, 35... Cell barrier, 36... Light absorption layer, 37... Light reflection layer, 38 ...fluorescent substance. Applicant Oguchi Hon Printing Co., Ltd.

Claims (1)

[Claims] (1) The cell barrier constituting a plurality of matrix-shaped display element cells has two layers: a light-absorbing layer on the viewer side and a light-reflecting layer on the opposite side.
A plasma display panel characterized by having a layered structure.