KR19990020128A - Plasma display device - Google Patents

Abstract

The present invention discloses a PDP having a novel configuration.

Conventionally, the electrode of the front substrate is composed of a transparent electrode and a vertical stack of metal electrodes. In the present invention, the black metal electrode is formed to overlap only part of the transparent electrode at the same level, thereby improving the aperture ratio and luminance of the PDP. The effect of improving contrast and preventing peeling of the transparent electrode is achieved without a separate black stripe.

Description

Plasma display device

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a plasma display panel (PDP), and more particularly to the improvement of the front electrode thereof.

As shown in FIG. 1, the PDP using the gas discharge phenomenon for image display is divided into partitions B by arranging the electrodes E1 and E2 on the front and back substrates P1 and P2 so as to cross each other. A structure having a formed structure (DC PDP) and covering one electrode (front electrode in FIG. 1; E1) with a dielectric layer (D) (and its protective layer; P) for use of wall charge ( AC PDP) is mainly used.

A fluorescent layer (not shown) is provided to enhance light emission luminance and color, and is mainly formed on the opposite side of the dielectric layer D, so that the PDP of FIG. 1 may be referred to as a reflective PDP.

In this configuration, since the front electrode E1 is located in the transmission path of the light generated by the discharge, the front electrode E1 is composed of a transparent electrode to prevent the luminance decrease. However, indium tin oxide (ITO), which is a transparent electrode material, has low conductivity and a severe voltage drop, and as a result, a structure in which a metal electrode M having a small area is stacked on the transparent electrode T, as shown in FIG. 2. It is used for the front electrode E1.

The configuration of FIG. 2 also shows an auxiliary electrode E3 parallel to the one side or both sides of the front electrode E1 for maintaining front and continuous discharge, and is disclosed between the front electrode E1 and the back electrode E2. When the discharge V1 occurs, the sustain discharge V2 is responsible for the main discharge between the auxiliary electrode E3.

On the other hand, the contrast of the screen is somewhat in conflict with the luminance, and the black stripe (S) is formed of black material in the ineffective area such as the upper part of the partition B to improve the contrast.

However, such a conventional configuration has various problems. First, since a plurality of functional layers such as a black stripe (S), a transparent electrode (T), and a metal electrode (M) must be sequentially formed on the front substrate (P1). The process is complicated and the manufacturing cost is high. Next, ITO, which is a transparent electrode (T) material, is difficult to uniform patterning and is vulnerable to heat, so that it is easy to peel off during the firing or use of the metal electrode (M). This is small. In addition, even when viewed in plan view, the front electrode E1 and the black stripe S occupy separate areas, and thus device arrangement is also inefficient. In addition, since the metal electrode M is opaque, it cannot be formed in a large area, so that the conductivity cannot be greatly improved, and the body color is also white or brown, which also hinders image recognition.

In view of these conventional problems, an object of the present invention is to provide a PDP having a simple functional layer structure, preventing a defect of a transparent electrode, and having an efficient space arrangement, a strong voltage, a small size, and improved image recognition.

1 is a cross-sectional view showing a general configuration of an AC PDP,

2 is a cross-sectional view showing a conventional configuration of a surface discharge type AC PDP;

3 is a cross-sectional view showing one configuration of the present invention PDP;

4 is a cross-sectional view showing another configuration of the present invention PDP;

5 is a cross-sectional view showing another configuration of the present invention PDP.

Explanation of symbols for main parts of the drawings

P1, P2: front and back substrates B: bulkhead

E1, E2: front and back electrodes T: transparent electrodes

M: metal electrode E3: E3a, E3b: auxiliary electrode

In order to achieve the above object, the PDP of the present invention is characterized in that a metal electrode made of a black material is formed so that a part thereof overlaps with the transparent electrode on the same surface as the transparent electrode.

Preferably, the black metal electrode is formed in the ineffective area on the partition wall, so that the contrast can be improved without a separate black strip, and the metal electrode can be formed in a large area, thereby improving the conductivity and transparency. By anchoring the electrode, it is possible to prevent defects such as peeling.

EXAMPLE

Such specific features and advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

In FIG. 3, the front electrode E1 formed of a stack of the transparent electrode T and the metal electrode M is formed of a black material such as black Ag, and the transparent electrode T according to the present invention. Is formed on the front substrate P1, and only a part thereof is stacked on one side of the transparent electrode T.

Preferably, the black metal electrode M is formed in an ineffective area on the partition wall B, and only a part of the black metal electrode M extends on the effective area outside the partition B to overlap the transparent electrode T, or the transparent electrode. T extends to the ineffective area on the partition B and overlaps the metal electrode M. As shown in FIG.

Since the rest of the configuration is almost the same as the conventional configuration of Figs. 1 and 2, duplicated description is omitted.

According to such a configuration, since the metal electrode M, which prevented image recognition in white or brown, is formed in black, the metal electrode M itself serves as a black stripe (S in FIG. 2), so that a separate black stripe is unnecessary. The configuration of the front substrate P1 side is simplified.

In addition, since only the transparent electrode M is positioned or only a part of the metal electrode M is projected in the effective area between the partition walls B, the aperture ratio can be increased and the screen brightness can be improved accordingly.

In addition, since the metal electrode M having excellent adhesion to the glass front substrate P1 overlaps the transparent electrode T and anchors it, problems such as peeling of the transparent electrode T can be prevented.

In addition, since the metal electrode M can be formed in a very wide area up to the conventional black stripe S area, the conductivity can be improved. Accordingly, even when the large-area PDP is configured, the voltage drop is small to obtain a uniform screen luminance. It becomes possible.

3, only the front electrode E1 has the features of the present invention, and the auxiliary electrode E3 has a vertically stacked structure as in the prior art. 4, the auxiliary electrode E3 as well as the front electrode E1 have the features of the present invention. In this case, the metal electrode M of the front electrode E1 of the auxiliary electrodes E3 of two adjacent pixels is provided. ) Is separated in the ineffective area on the partition (B).

5 is an embodiment of a four-electrode element having two auxiliary electrodes E3 (E3a and E3b). In this embodiment, the front electrode E1 has a conventional vertical stack structure and the left and right auxiliary electrodes E3. E3a and E3b have the present invention structure and cause sustain discharge V2 between the front electrode E1.

As described above, according to the present invention, the functional layer structure of the front substrate is simplified, the aperture ratio is increased, the screen brightness is improved, and the image recognition is improved by using the black stripe of the metal electrode, the peeling of the transparent electrode is prevented, and the conductivity is improved. It is possible to contribute to the achievement of a uniform picture brightness and the improvement of the space efficiency of the PDP.

As a result, the present invention has the effect of providing high quality PDP with high productivity and yield.

Claims (6)

In a plasma display device in which electrodes on the front and rear substrates are arranged to face each other and partitioned into a plurality of pixels by partition walls, the electrodes of the front substrate are made of a stack of transparent electrodes and metal electrodes. The metal electrode is made of black material and is formed at the same level as the transparent electrode, A part of the metal electrode overlaps one side of the transparent electrode Plasma display element characterized by. The method of claim 1, The metal electrode is formed in the ineffective region on the partition wall Plasma display element characterized by. The method according to claim 1 or 2, A portion of the metal electrode extends to an effective area outside the barrier rib and overlaps the transparent electrode Plasma display element characterized by. The method according to claim 1 or 2, The transparent electrode extends into an ineffective region on the partition wall and overlaps the metal electrode; Plasma display element characterized by. The method of claim 1, wherein the electrode of the front substrate A rear substrate, an electrode, a front electrode causing an initial discharge, and at least one auxiliary electrode causing a sustain discharge; At least one of the front electrode and the auxiliary electrode has a partially overlapping structure of the metal electrode and the transparent electrode Plasma display element characterized by. The method according to any one of claims 1 to 5, The front electrode and the auxiliary electrode each have the partial overlapping structure, and the metal electrode of the front electrode of one pixel and the metal electrode of the auxiliary electrode of the adjacent pixel are separated from the ineffective area on the partition wall. Plasma display element characterized by.