KR19990020133A - Plasma display device - Google Patents

Abstract

The present invention discloses a PDP having a novel configuration.

The present invention improves the average luminance along with the local luminance by forming the partition wall transparently and forming a narrow black partition wall on the transparent partition wall to form an Ω-type fluorescent layer inverted over the substrate from the upper surface of the transparent partition wall. And the viewing angle is improved, and this configuration can be efficiently implemented by a method of forming a U-shaped space between partition walls, particularly by probability etching.

Description

Plasma display device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (PDP), and more particularly to a method of manufacturing a plasma display device.

PDPs using gas discharge phenomena are classified into direct current (DC) and alternating current (AC) types according to the characteristics of the applied voltage. The AC type PDP is a wall charge as shown in FIGS. 1 and 2. One side of the electrode is covered with a dielectric layer to form charge), and voltage is alternately applied to form and discharge wall charges.

PDPs are generally provided with a fluorescent layer for improving the luminance and displaying a predetermined color or color, and are classified into a transmissive type PDP as shown in FIG. 1 and a reflective type PDP as shown in FIG. 2 according to the position of the fluorescent layer. In general, the fluorescent layer and the dielectric layer face each other.

First, referring to the transmissive AC PDP of FIG. 1, this basically arranges the electrodes E1 and E2 on the two substrates P1 and P2 on the front and rear surfaces having discharge spaces formed therebetween, and partitions them into partitions B. Has one configuration. Since the transmissive type, the fluorescent layer F is formed on the front substrate P1 side, and the dielectric layer D is formed on the opposite side of the rear substrate P2 side.

Here, the functional layers (E1, E2, F, B, D) are generally formed by a printing method having low process cost and excellent productivity. For printing, each functional layer material is dispersed in a volatile solvent, glass particles, and the like. The calcined particles and a resin for maintaining the printed layer until the calcined particles are added to form the functional layer by firing after printing and drying.

As a result, the functional layer by printing, or the thick film method, is not uniform in structure, and fine voids are formed, so that the overall characteristics of the functional layer are inferior to those of the functional layer formed by the thin film.

In particular, in the PDP, an ion bombardment phenomenon occurs in which plasma at the time of discharge through the dielectric layer D strikes and damages the electrode (E2 in FIG. 1 and E1 in FIG. 2). On (D), a material such as MgO is laminated by a thin film method such as sputtering to form an overcoat layer.

As described above, the transmissive PDP of FIG. 1 has an advantage of excellent luminance since discharge light transmits the fluorescent layer F from the rear surface, but a thin and uniform filter is applied to the fluorescent layer F to realize uniform luminance as a whole. There is a technical difficulty to form a), the reflective PDP of Figure 2 is mainly preferred.

In contrast to the transmissive PDP of FIG. 1, the reflective PDP of FIG. 2 has a dielectric layer D and its protective layer T on the front substrate P1 side, and a fluorescent layer F on the opposite side of the rear substrate P2. Is provided.

Such a reflective PDP has no difficulty in forming the fluorescent layer F in a thin filter form, but in order to improve the luminance, the fluorescent layer F must have a maximum surface area, so that the reflective PDP has a U-shaped cross section over both partition walls B. FIG. There are other difficulties.

As such, various methods as shown in FIG. 3 have been used to form the fluorescent layer F in a U-shaped cross section.

First, (A) is a lamination printing method. In the case of lamination printing of the partition wall (B), the printing layer (F ') of the fluorescent layer (F) is alternately laminated on the left and right sides of the printing layer (B') and the fluorescent layer (F). How to complete it. Although this method was experimentally carried out in the early stages of PDP manufacturing, the fluorescent layer F, which is very large in printing maneuverability and susceptible to heat, has to be subjected to the firing of the partition wall B.

Next, FIG. 3B is a kind of precipitation method, in which a low-concentration phosphor slurry F 'is introduced between a partition wall B and a fluorescent layer F having a concave surface is formed by drying, and a slight surface area is obtained. There is only an increase in the distance from the actual U-shaped cross section.

On the other hand, Figure 3 (C) is a drop method by the source of the present inventors, by dropping a low-viscosity phosphor slurry (F ') on the upper portion of both partitions (B) to flow down Forming the fluorescent layer (F) of the U-shaped cross-section, it is judged to be the most suitable for forming the U-shaped cross-section of the existing method is currently in mass production.

However, these conventional methods use a method of using the side surface of the partition wall B to expand the surface area of the fluorescent layer F. The height of the partition wall B is higher than that of the fluorescent layer F, and thus the U-type is appropriate. Formation of the cross section is a relatively difficult situation.

In addition, when the user leaves the front of the PDP, a blind spot is formed by covering the field of view of the partition B, thereby causing a problem of narrowing the viewing angle.

In order to solve the various problems of the related art, an object of the present invention is to provide a PDP capable of enlarging the surface area of the fluorescent layer, improving luminous efficiency, and enlarging the viewing angle.

1 is a cross-sectional view showing the configuration of a transmissive PDP;

2 is a cross-sectional view showing the configuration of a reflective and multi-electrode PDP;

3 (A) to (C) are cross-sectional views showing conventional methods of forming a fluorescent layer having a U-shaped cross section,

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

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

Figure 6 (A) to (F) is a sequential cross-sectional view showing a manufacturing process of the PDP of the present invention by photolithography.

Explanation of symbols for main parts of the drawings

P1, P2: front and back substrates E1, E2: electrodes

F: fluorescent layer B: transparent partition

B ': Insulation layer 1:

2: transparent layer

In order to achieve the above object, the PDP of the present invention has a barrier rib formed of a transparent material, and a black bulkhead having a narrower width is laminated on the transparent barrier rib, and the outer surface of the transparent barrier rib and the upper surface of the substrate are formed from the upper surface of the barrier rib. Forming a fluorescent layer over.

In the PDP of the present invention as described above, the partition wall may be formed by a multilayer printing method, but more preferably, it may be formed by a photolithography method or a sand blasting method.

Then, since the fluorescent layer extends from the upper part of the partition wall, the surface area of the fluorescent layer is increased to improve the luminance, and a part of the light emission of one pixel illuminates adjacent pixels to improve the overall screen brightness. This has the effect of greatly improving.

EXAMPLE

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

In FIG. 4, the upper part of the partition B partitioning the discharge space between the two substrates P1 and P2 into a plurality of pixels is formed of a transparent material according to the features of the present invention, and the upper part of the sphere has a narrower black partition wall 1. The fluorescent layer F is formed and extends from the upper surface of the outer transparent partition B of the black partition 1 to the upper surface of the rear substrate P2 from the upper surface to the outer surface. That is, the fluorescent layer F is formed into an inverted Ω type having a larger area than the U type of FIG. 3 by the provision of the black partition wall 1.

In such a configuration, the formation of the narrow black partition wall 1 not only enlarges the surface area of the fluorescent layer F, but also allows the portion of the upper part of the transparent partition B to be directly viewed by the user, thereby providing more excellent luminance. When the user leaves the front, the blind spot is shielded only by the auxiliary partition wall 1, so that the viewing angle can be remarkably improved.

In addition, the entire discharge space except for the front substrate P1 is surrounded by the fluorescent layer F. Then, efficient light emission can be achieved, and the fluorescent layer F can be printed by printing a phosphor slurry. In the case of forming the fluorine slurry on the outer surface of the transparent partition wall (B) is limited by the surface tension and viscosity of the phosphor slurry located on the upper surface of the transparent partition wall (B), so that the fluorescent layer (F) It can be formed efficiently.

It can be compared with the falling method of FIG. 3 (C) of the latter characteristic, and the partition slurry (B) while the phosphor slurry (F ') deposited on the transparent partition (B) in FIG. 3 (C) flows down by its own weight. Since the amount remaining on the outer surface is only the viscosity, the coating amount thereof is not sufficient, whereas in the present invention, the phosphor slurry located on the upper surface of the transparent partition wall (B), that is, the horizontal surface, flows down the outer surface of the transparent partition wall (B) by surface tension and viscosity. Since it will be limited to a sufficient amount of the fluorescent layer (F) on the outer surface of the transparent partition wall (B).

In such a configuration, the transparent partition B serves to increase the overall luminance of the PDP by partially transmitting the light generated from one pixel to the adjacent pixels.

That is, as shown in FIG. 4, the light L generated by the discharge according to the selection of the right pixel is partially reflected by the reflected light L1 at the interface with the transparent partition B, and part of the transparent partition B The light is transmitted to the transmitted light L2 toward the pixel on the left side of the drawing. R is a reflective layer as needed.

This function may seem to be somewhat in conflict with the basic function of barrier rib (B) composed of an opaque insulating material to prevent cross talk, or interference, by blocking charge transfer and light transmission between adjacent pixels. However, since the transfer of charges that excite and emit the fluorescent layer F is blocked and only transmitted light L2 is transmitted, the problem of crosstalk does not occur.

In other words, the transmitted light L2 transmitted to the left pixel transmits the fluorescent layer F from the rear surface, thereby improving its brightness, that is, the luminance, but does not excite and emit the fluorescent layer F.

Such a unique function of the present invention increases the average brightness of the PDP, and thus exhibits a great effect not only in the illustrated AC type PDP but also in the DC type PDP. The DC-type PDP which emits light only when the pixel is selected, that is, does not have a memory effect, is difficult to use due to the high brightness and / or moving image indicators. As the average brightness is improved, a DC-type PDP having a simple structure and operation can be used for high resolution and / or moving picture display.

By the way, the rear projection of the adjacent pixel by the transparent partition B lowers the luminance of the selected pixel by the amount of the transmitted light L2. This problem can be supplemented by the improvement of the luminance by the configuration of the black partition 1 and the inverted Ω-type fluorescent layer F according to another feature of the present invention.

In this case, the light amount of the transmitted light L2 of the adjacent pixel depends on the light transmittance or surface reflectance of the transparent partition wall B. The light transmittance mainly depends on the transparency of the partition B material and the surface reflectance mainly depends on the refractive index. = 1).

As described above, it is very difficult to select a material having a transparency and a refractive index suitable for achieving the required light transmission amount. Accordingly, in the embodiment of FIG. 5, the transparent layer 2 having a different refractive index on the surface of the transparent partition B may be used. The light transmittance is adjusted by laminating.

That is, in the embodiment of FIG. 5, the light transmittance is determined not by the refractive index of the transparent barrier material (B) itself, but by the difference between the refractive indices of the transparent barrier material (B) and the transparent layer (2). It becomes easy.

Here, the transparent layer 2 not only plays a role of controlling light transmittance to adjacent pixels, but also promotes arrangement and adhesion of the fluorescent layer F and contributes to diffusion of emitted light to improve the viewing angle of the PDP.

Meanwhile, in the embodiment of FIG. 5, instead of the reflective layer R of FIG. 4, the dielectric layer D on the back substrate P2 side is made of a black material to concentrate light emission to the entire surface.

In the present invention as described above, the transparent partition wall (B) may be formed by a lamination printing method as in the related art (see FIG. 3 (A)), but is preferably formed by a sandblasting method as shown in FIG.

After the electrode E2 is formed on the substrate P2 in FIG. 6A, the insulating layer B 'made of a transparent material with the required thickness of the transparent electrode B is formed on the entire surface in FIG. 6B. Are stacked. Here, the symbol R is a DC-type PDP or a black or metallic gloss reflective layer formed on the entire surface of the substrate P2 as needed when the dielectric layer D is formed on the front substrate P1 side.

Next, in FIG. 6 (C), the insulating layer B 'is selectively etched by placing a mask M' on the upper portion and spraying a grit G to transparently partition the barrier B as shown in FIG. 6D. Will form. In this case, the mask M 'is preferably made of metal so as not to be etched into the grit G.

In this sandblasting method, a characteristic part of the present invention is that the space between the etched both transparent partitions B is formed to be U-shaped.

The etching of the U-shaped space may be achieved by a probabilistic etching method in the present invention. Such probabilistic etching is performed by changing the injection angle of the grit G to the left and right of the drawing during sandblasting. The central portion is deeply etched and the outer etch amount is reduced to form a U-shaped space as shown.

After the transparent partition B is formed, a black partition 1 having a width narrower than that of the transparent partition B is formed on the upper surface thereof, preferably in the center thereof, as shown in FIG. 6E.

Formation of the black partition wall (1) is preferably made by a printing method, it is preferable to be fired together with the transparent partition wall (B), and similar to the transparent partition (B) including the black pigment in the composition similar to the firing conditions Set it.

Then, as shown in FIG. 5 (F), the fluorescent layer F is preferably formed on the upper portion thereof by a printing method. As shown in FIG. 3 (C), the drop due to the drop and dripping of the low concentration phosphor slurry F 'as shown in FIG. Although it is preferable to apply the method, the fluorescent layer F having a very large surface area is formed as shown by the precipitation method in which the phosphor slurry of a lower concentration is filled by printing and simply dried according to the characteristics of the aforementioned surface tension and viscosity. You can do it.

Since the space between the partitions B forms a U-shaped space, the fluorescent layer F is not unnecessarily filled in the corners of the partitions B and the substrate P2 as in the conventional case. ) Can be arranged efficiently, and the viewing angle when the user is off the front can be improved.

As described above, according to the present invention, a PDP having excellent luminous luminance and viewing angle can be provided. In particular, the present invention can be applied to a DC-type PDP to greatly expand its usefulness.

Claims (5)

In a plasma display device in which discharge spaces of two substrates are partitioned into partitions and a fluorescent layer is formed in pixels between the partitions, The partition wall is made of a transparent material, A black bulkhead having a narrower width is provided on the transparent partition. The fluorescent layer is formed from the upper surface of the transparent partition wall outside the black partition wall to the outer surface of the transparent partition wall and the substrate. Plasma display element characterized by. The method of claim 1, A transparent layer is formed from an upper surface of the transparent partition wall outside the black partition wall to an outer surface of the transparent partition wall and the substrate. The fluorescent layer is formed on this transparent layer Plasma display element characterized by. The method of claim 2, The refractive index of the transparent layer and the transparent material is different Plasma display element characterized by. The method of claim 1, The reflective layer is provided below the transparent partition wall Plasma display element characterized by. The method of claim 1, A black dielectric layer is provided below the transparent partition wall. Plasma display element characterized by.