JP3200042B2 - Surface discharge type plasma display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (hereinafter, also referred to as "PDP") of a plasma display device, and more particularly to a surface discharge type AC plasma display panel.

[0002]

2. Description of the Related Art A PDP has a structure in which an electrode is exposed to a discharge space.
It is roughly classified into a C type (direct discharge type) and an AC type (indirect discharge type) in which electrodes are covered with a dielectric layer. AC type PDPs are roughly classified into a surface discharge type in which electrodes are provided on a back plate and a front plate, and a surface discharge type in which a pair of electrodes are provided on one of a back plate and a front plate. In the driving method of the AC type PDP, a refresh method, a matrix address method,
There is a self-shift method and the like.

[0003] For example, a conventional matrix address type surface discharge type AC PDP has barrier ribs (insulating partition walls) between the inner surfaces of a front plate 1 and a rear plate 2 facing each other in parallel as shown in FIG. (Not shown) to define the gas space 4 into a plurality of light emitting areas. The barrier ribs are provided to separate individual pixel cells and prevent leakage of ultraviolet rays from adjacent cells.

On the inner surface of the front panel 1, a pair of sustain electrodes are formed extending in parallel as row electrodes for each pixel cell, a dielectric layer 23 is formed thereon, and an MgO layer 24 is formed thereon. ing. The sustain electrode is formed by overlapping the metal bus electrode Sa on the transparent electrode S. The dielectric layer having a desired thickness t is formed on the patterned sustain electrode on the front plate so as to have a uniform thickness by screen printing or the like.

Address electrodes W are formed on the back plate 2 in parallel with the pixel cells so as to intersect with the sustain electrodes.
Barrier ribs 3 are formed in parallel between the address electrodes by printing or the like. The rare gas mixture is sealed in the gas space 4 by aligning the positions of the front plate 1 and the back plate 2 so that the address electrodes and the sustain electrodes intersect with the pixel cells.
A surface discharge type PDP is formed.

In the operation of the PDP, when a predetermined voltage is applied between the address electrode W and the sustain electrode, a surface discharge region is generated in the gas space 4 on the dielectric layer 23 at the intersection of each electrode, Phosphor layer 1 due to ultraviolet rays emitted from the discharge region
1 is excited to emit light, and emits light from the front panel 1. This surface discharge is maintained by the sustain voltage applied between the sustain electrodes, and is extinguished by the erase pulse applied to the sustain electrodes.

[0007] In a general surface discharge type AC PDP, a sustain electrode is formed by overlapping a metal bus electrode on the edge of a linear striped transparent electrode. Barrier ribs formed on the back plate 2 facing the pair of sustain electrodes intersect almost vertically to form a discharge cell. Therefore, a gap is easily formed below the barrier rib due to the thickness (several μm) of the bus electrode and the unevenness of the barrier rib surface.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a PDP having improved contrast.

[0009]

According to the present invention, a discharge space is sandwiched.
The first substrate and the back side of the pair of display surface side facing Nde
A second substrate serving as either provided on the inner surface of the first substrate
One and a plurality of row electrode pairs extending in a horizontal direction, the dielectric layer first cover inner surface and the row electrode pair of substrates, a plurality of rows extending in and vertically provided on the inner surface of the second substrate and the electrode, at least the column electrodes on the inner surface of the front Stories second substrate
Provided a vertically extending therebetween, said discharge space horizontal
A plurality of partitions defining a plurality of light emitting areas in the direction, and the row
A phosphor layer covering the side surfaces of the electrode and the partition wall, a surface discharge type plasma display panel having the dielectric
Extend vertically to the region on the body layer opposite the partition.
A long black or dark color layer is provided.

[0010]

Since a black or dark layer is provided in a region facing the partition on the first substrate side, reflection of external light can be prevented and the contrast is improved.

[0011]

Embodiments will be described below with reference to the drawings.
In the surface-discharge type PDP shown in FIG. 2, the front surface 1 serving as a display surface, that is, the inner surface of the first substrate (the surface facing the back surface 2).
, A plurality of transparent electrodes S made of, for example, indium tin oxide (so-called ITO) or tin oxide (SnO) are formed in parallel with each other. Each transparent electrode S is provided with an extension portion 7 extending in a direction perpendicular to the extension direction of the transparent electrode S so as to form a discharge gap G which forms the center of each light emitting region.

In order to reduce the line resistance of these discharge transparent electrodes and not to obstruct the emission of light, bus electrodes Sa are formed on the edges of these transparent electrodes S with a narrow width along the longitudinal direction. . The bus electrode Sa has an area smaller than the area of each of the transparent electrodes, and is provided on the edge of the transparent electrode opposite to the discharge gap. The transparent electrode S and the bus electrode Sa constitute a sustain electrode, and a pair of sustain electrodes sandwiching the discharge gap is a row electrode pair.

The inner surface of the substrate and the sustain electrodes S, S of the row electrode pairs
A dielectric layer 23 is formed on these so as to cover a. The dielectric layer 23 has, on the bus electrode Sa, a protrusion 23a having a thickness larger than the thickness of the dielectric layer on the transparent electrode from the edge on the discharge gap side to the bus electrode. The dielectric layer 23 has a thickness of 20 to 30 μm in a low flat portion, and further has a thickness of 7 to 100 μm in the protruding portion 23 a.
It is formed in a thickness of preferably 10 to 20 μm. As shown in FIG. 3, the thickness t of the flat portion and the thickness t2 of the protruding portion are obtained.
Is t: t2 = 1: 1.25 to 5.0, preferably t: t2 = 1: 1.3 to 2.0.

Further, an MgO layer 24 made of magnesium oxide (MgO) is formed on the dielectric layer 23. On the other hand, the inner surface of the back plate 2 which is the second substrate facing the first substrate with the discharge space 4 interposed therebetween (the surface facing the front plate 1)
, The barrier ribs 31 are arranged in parallel with each other such that the longitudinal direction thereof extends in a direction intersecting the transparent electrode S. The barrier rib 31 may be formed of a transparent or colored, preferably white, highly reflective glass paste, or a glass paste containing a black pigment such as iron oxide or cobalt oxide chromium oxide to enhance contrast.

Further, on the inner surface of the back plate 2, a plurality of address electrodes W, for example, column electrodes made of, for example, aluminum (Al) or an aluminum alloy are provided so as to extend over the entire rear plate 2 between the adjacent barrier ribs 31. They are formed in parallel. These address electrode groups are three in accordance with red, green, and blue R, G, and B color signals in order to form a color PDP.
In pairs. The address electrode W is not limited to Al or an Al alloy, but may be a metal or alloy such as Cu or Au having a high reflectivity.

Therefore, on the three address electrodes W,
Phosphor layers 11R, 11G, 11 made of phosphors corresponding to R, G, B so as to cover this and the side surface of the barrier rib 31.
B are formed respectively. The gas space 4 is defined by the barrier ribs 31 in a plurality of light emitting regions between the MgO layer 24 on the front plate 1 and the phosphor layers 11R, 11G, 11B on the back plate 2. For example, Ne.Xe gas or He.Xe gas is sealed in the gas space 4 as a rare gas.

As shown in FIGS. 3 and 4, in the light emitting region of the front panel 1 of the embodiment color PDP, the dielectric layer 23 is formed.
Is selectively thickened at least at the portion on the bus electrode Sa (the protruding portion 23a), the discharge starting voltage on the bus electrode Sa becomes higher than that on the transparent electrode S, and the transparent electrode S
The spread of the upper surface discharge is suppressed on the bus electrode Sa, and the discharge current can be limited.

The surface discharge started at the discharge gap G of the sustain electrode spreads outward (in the direction of the normal in FIG. 3) along the transparent electrode, but the dielectric layer protrusion 23a on the bus electrode is located at another location. Since the ribs become more convex, the partition walls, ie, the barrier ribs, and the other dielectric layer portions are in close contact with each other, and there is almost no gap, so that the surface discharge does not spread to adjacent cells. Further, the surface discharge does not spread to the adjacent cell in which the dielectric layer protrusion 23a is close.

In the above embodiment, the dielectric layer 23 has a structure in which the protrusion 23a is provided only on the bus electrode Sa in the light emitting region between the regions 31a facing the partition walls.
As shown in FIG. 3, a surface discharge type P having a protrusion 23a extending on a bus electrode Sa to an adjacent cell in a row direction along the bus electrode Sa.
It can also be DP. Further, in another embodiment, as shown in FIG. 6, the dielectric layer is formed on the projection 2 on the bus electrode Sa.
3a as well as the protrusion 2 of the region 31a facing the partition wall.
3b can be used as a surface discharge type PDP. Thus, the discharge does not spread to the adjacent cell by making the dielectric layer in the region facing the partition also convex.

Further, as shown in FIG. 7, a transparent electrode S is formed as a surface discharge type PDP in which individual island-shaped electrodes are arranged at a distance of a discharge gap between a pair of transparent electrodes connected to a bus electrode Sa. Because only the thickness of the dielectric layer and the bus electrode intersects with the region 31a facing the barrier rib, the barrier rib and the region 31a facing the barrier rib come into close contact with each other, and the discharge reaches the adjacent cell. It will not spread.

In another embodiment, as shown in FIG. 8, a surface discharge type PD having a projecting portion 23a extending on a bus electrode Sa connecting an island-shaped transparent electrode S to an adjacent cell along the bus electrode Sa.
It can also be P. In another embodiment, as shown in FIG. 9, not only the protrusion 23a on the bus electrode Sa where the dielectric layer connects the island-shaped transparent electrode S, but also the protrusion 23b of the region 31a facing the partition wall. Surface discharge type PDP
It can also be. Thus, the discharge does not spread to the adjacent cell by making the dielectric layer in the region facing the partition also convex.

Further, as shown in FIG. 10, in still another embodiment, a dielectric layer is formed on the projection 23 on the bus electrode Sa.
In addition, a protrusion 23c that protrudes not only between the adjacent bus electrodes Sa of the discharge cells adjacent to each other in the partition wall extending direction can be formed. As shown in FIG. 11, in a surface discharge type PDP having a dielectric protrusion 23c and a bus electrode upper protrusion 23a between bus electrodes Sa of discharge cells adjacent in the column direction,
Since erroneous discharge of adjacent cells is prevented, and the distance d between adjacent discharge cells in the column direction can be reduced, the length of the transparent electrode extension 7 per discharge cell can be secured, and luminous efficiency can be improved. it can. Further, as shown in FIG. 12, a surface discharge type PDP in which the protruding portions 23c between the bus electrodes Sa in the row direction can be extended, and further, as shown in FIG. In addition to the projections 23c between the bus electrodes, the projections 23b have a matrix-like dielectric projection that is thicker than the thickness of the dielectric layer on the transparent electrode near the discharge gap of each cell on the front panel. Surface-discharge type PDP having the same. Also, the surface discharge type P having these bus electrode inter-projection portions 23c
Also in the DP, the island-shaped transparent electrode S shown in FIGS.
It is clear that a structure having

As described above, the present invention relates to a surface discharge type PDP having a pair of electrodes buried in a dielectric layer facing a discharge space and arranged at a distance from a discharge gap. The spread of the surface discharge is controlled by making the thickness of the body layer larger than the thickness of the dielectric layer near the edge of the discharge gap. This can suppress the spread of unnecessary surface discharge not only in the case of a single-layer or multi-layer sustain electrode, but also in the case of a single-layer or multi-layer sustain electrode, in addition to a two-layer sustain electrode having a transparent electrode and a bus electrode. Further, in the above embodiment, the barrier ribs are provided. However, according to the present invention, a surface discharge PDP having no barrier ribs can be obtained.

Further, by forming a black or other dark portion on the protrusion so that the protrusion of the dielectric layer finally becomes black or another dark color, the contrast between the light emitting regions can be improved. . In the above embodiment, the configuration in which the sustain electrode group is formed on the front plate and the address electrode group is formed on the back plate is adopted.However, in the present invention, the structure is not limited to the structure of the above embodiment. The address electrode group can also be formed on the back plate. Also, color P
In the case of DP, the phosphor layers 11R, 11G, and 11B may be disposed on at least one of the side surface and the back plate of the barrier rib 31. Further, the present invention can be similarly applied to a monochrome PDP having no phosphor layer in addition to a color PDP.

FIG. 2 shows an example in which the barrier ribs 31 are formed on the back plate 2, but they may be formed on the front plate 1 side. Further, FIG. 2 shows an example in which the barrier ribs 31 are formed in a line shape, but they may be in a matrix shape (lattice shape).
Next, a method of manufacturing a surface discharge type PDP according to the present embodiment will be described. (Preparation of Front Plate Side) First, as shown in FIG.
On the main surface of the front plate 1 made of washed glass, an ITO thin film is formed by vapor deposition to a thickness of 0.1 to 0.2 μm, and this thin film is formed by photolithography and etching to form a transparent electrode S for parallel discharge. I do. Each of the pair of transparent electrodes has an extending portion extending in a direction perpendicular to the entire extending direction for each light emitting region, and the free ends of each pair of the extending portions are formed in a pattern facing each other. Also, the transparent electrode
It can also be formed in a pattern of individual island-shaped electrodes consisting of the above-mentioned extending portions and connecting portions of the bus electrodes. The discharge gap between opposing free ends of the elongated portions of the pair of parallel transparent electrodes is set to 50 to 100 μm.

Next, as shown in FIG. 14B, vapor deposition, photolithography, and the like are carried out using a conductive metal such as Al on the opposite free ends of the elongated portions of the discharge transparent electrodes. The bus electrode Sa is formed to a thickness of 1 to 2 μm by etching. The bus electrodes are formed in a pair of parallel transparent electrodes in parallel with each other along the edge opposite to the extension.

Next, as shown in FIG. 14C, a dielectric glass paste is uniformly applied by screen printing to a thickness of 20 to 30 μm so as to cover these discharge transparent electrodes and bus electrodes. (First printing), and further, FIG.
As shown in FIG. 4 (d), the protrusions are applied by screen printing in a pattern having openings on the bus electrodes in each light emitting region to a thickness of 7 to 100 μm, preferably 10 to 20 μm (second printing). Further, the projecting portions may be formed in a pattern along a pair of parallel bus electrodes, and the projecting portions on the pair of parallel bus electrodes may be formed by projecting portions in a region opposed to a partition defining each light emitting region. It can also be formed in a pattern that crosslinks. In the second printing, a black pigment such as iron oxide, cobalt oxide or chromium oxide is mixed into the paste so that the projections are finally black or another dark color to form the projections. Can be improved.

The front plate is fired at a temperature of about 400 to 600 ° C. to form a dielectric layer. Next, as shown in FIG. 14E, an MgO layer is formed on this dielectric layer to a thickness of about several hundred nm by electron beam evaporation or the like. The creation of the front plate side is performed in this manner. (Preparation of back plate side) Al address electrodes of about 1 μm thickness are formed on the main surface of the back plate made of perforated and well-cleaned glass by vapor deposition, photolithography and etching in the same manner as described above. Formed.

Next, using a screen having a predetermined parallel pattern by a screen thick film printing technique, a transparent or impermeable glass paste is applied to the back plate between adjacent address electrodes at a thickness of about 10 μm / time. Printed in thick layers,
100-200 μm high, 50 μm and 300 μm wide
Barrier ribs parallel to each other are formed at intervals of m. Next, phosphors corresponding to R, G, and B are applied by printing to a thickness of 10 to 30 μm so as to cover the corresponding address electrodes, and the whole is fired at a temperature of about 400 to 600 ° C. In this way, the back plate is created. (Assembly of PDP) The front plate and the back plate on which the respective electrodes are formed are aligned such that the longitudinal direction of the barrier ribs and the address electrodes extend in the direction intersecting with the sustain electrodes, and sealed with a predetermined spacer. The formed gas space is evacuated, and moisture on the surface of the MgO layer is removed by baking. Next, a Ne · Xe gas is sealed in the gas space, and then the gas space is sealed to produce a PDP.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a front panel of a conventional PDP.

FIG. 2 is a schematic partially cutaway perspective view of the PDP of the embodiment.

FIG. 3 is a partial cross-sectional view of a front plate of the PDP of the embodiment.

FIG. 4 is a partial plan view of the inner surface of the front plate of the PDP of the embodiment.

FIG. 5 is a partial plan view of an inner surface of a front panel of a PDP according to another embodiment.

FIG. 6 is a partial plan view of an inner surface of a front panel of a PDP according to another embodiment.

FIG. 7 is a partial plan view of an inner surface of a front panel of a PDP according to another embodiment.

FIG. 8 is a partial plan view of an inner surface of a front panel of a PDP according to another embodiment.

FIG. 9 is a partial plan view of an inner surface of a front plate of a PDP according to another embodiment.

FIG. 10 is a partial plan view of an inner surface of a front plate of a PDP according to another embodiment.

FIG. 11 is a partial cross-sectional view taken along line AA ′ of the PDP of FIG. 10;

FIG. 12 is a partial plan view of an inner surface of a front panel of a PDP according to another embodiment.

FIG. 13 is a partial plan view of an inner surface of a front panel of a PDP according to another embodiment.

FIG. 14 is a schematic cross-sectional view illustrating a method of forming the front panel of the PDP of the example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front plate 2 Back plate 3 Barrier rib 4 Gas space 11 Phosphor layer 23 Dielectric layer 23a Dielectric layer protrusion 24 MgO layer 31 Barrier rib S Transparent electrode Sa bus electrode W Address electrode

Continuation of front page (56) References JP-A-6-5204 (JP, A) JP-A-7-295507 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 11 / 00-11/02

Claims (1)

(57) [Claims] 1. A pair of display surfaces facing each other across a discharge space.
A second substrate comprising a first substrate and a back side which is a side, and a plurality of row electrode pairs extending in said first or One horizontal direction is provided on the inner surface of the substrate, the inner surface and the rows of the first substrate a dielectric layer covering the electrode pairs provided on the inner surface of the second substrate and a plurality of column electrodes extending in <br/> vertically, before SL between at least said column electrodes on the inner surface of the second substrate A plurality of partition walls extending in the vertical direction and defining the discharge space as a plurality of light emitting regions in the horizontal direction, and side surfaces of the column electrodes and the partition walls.
And a covering phosphor layer, comprising: a surface facing the partition wall on the dielectric layer in a vertical direction.
A surface discharge type plasma display panel characterized in that a black or dark color layer extending on the surface is provided.