KR19990027577A - Dielectric layer of AC plasma display device - Google Patents

Abstract

The present invention discloses an improved dielectric layer of AC PDP.

In the related art, charges are concentrated only on the electrodes due to the difference in the relative thicknesses of the dielectric layers, so that charging efficiency is low and power consumption is high. In the present invention, the dielectric layers are formed in the shape of a hat on the electrodes to equalize the thickness so that the charges are formed evenly over a large area. High brightness and low power were achieved.

Description

Dielectric layer of AC plasma display device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alternating current (AC) plasma display panel (PDP), and more particularly to a dielectric layer thereof.

PDPs using gas discharge phenomena for image display have recently been put to the forefront of the next generation of display devices due to the practical application of 40 ″ elements, and the basic configuration thereof is as shown in FIG.

In FIG. 1, electrodes E1 and E2 are arranged opposite to each other on the front and rear substrates P1 and P2, and the partition B is partitioned between the spaces filled with the discharge gas.

On the other hand, the fluorescent layer F is provided on one side substrate (P1 in the figure) for the improvement of the luminance and the color image.

The above configuration is common to the DC-type PDP, but the AC-type PDP is provided with a dielectric layer D and its protective layer T on one electrode (E2 in the figure) for the formation of wall charges.

The operation of the dielectric layer D in the AC PDP will be described with reference to FIG. 2.

When voltage is applied to the electrode E2, charge (-), that is, wall charge, is charged on the surface of the dielectric layer D. Here, a relational expression for determining the charge amount is as follows.

Dielectric Capacity C = εS / d

Charge amount = Q = CV

Where ε is the dielectric constant of the dielectric layer D, S is the area, d is the thickness, and V is the applied voltage.

That is, since the charge amount Q is inversely proportional to the thickness d of the dielectric layer D, when the dielectric layer D stacked on the electrode E2 is examined in detail, the thickness of the charge on the electrode E2 indicated by the dotted line is d1. Although constant at ', the thickness of the dielectric layer D becomes out of the outer end of the electrode E2 becomes the inclined distance between the outer end of the electrode E2 and the surface of the dielectric layer D, so that the thickness is gradually increased to d2'.

Accordingly, the charge (-) is mainly concentrated only in the dielectric layer (D) portion of the upper portion of the electrode (E2) and the density of the charge (-) decreases toward the outside thereof, thereby limiting the area used for forming the wall charge. However, since the repulsive force acts between the charges (-), a resistance is generated in the upper portion of the electrode (E2) where the charges (-) are concentrated, and thus a problem in that the applied voltage cannot be converted into sufficient charge (-) occurs.

In view of such a conventional problem, an object of the present invention is to provide a dielectric layer having high efficiency of wall charge formation by preventing concentrated charge formation of charge and dispersing it in a large area.

1 is a cross-sectional view showing the configuration of a typical AC PDP,

2 is a schematic cross-sectional view illustrating the operation of the dielectric layer;

3 is a schematic cross-sectional view illustrating the principle of the present invention;

4 is a partially enlarged cross-sectional view of a dielectric layer showing one embodiment of the present invention.

Explanation of symbols for main parts of the drawings

P1, P2: Front and back boards E1, E2: Front and back electrodes

D: dielectric layer D ′: auxiliary dielectric layer

In order to achieve the above object, the present invention is characterized by equalizing the thickness of the dielectric layer on the electrode.

This solves the problem of intensive charge of the charge on the electrode and mutual mutual rejection. Since the charge is evenly charged over a large area of the dielectric layer, the wall charge can be efficiently formed.

Accordingly, the present invention provides an AC PDP capable of high brightness while lowering power consumption.

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 dielectric layer D laminated on the substrate E2 on the back substrate P2 is equalized relative to the electrode E2 in accordance with the features of the present invention.

That is, when the distance from the upper surface of the electrode E2 to the surface of the dielectric layer D, that is, the thickness is d1, the distance d2 from the outer edge of the electrode E2 to the surface of the dielectric layer D is set equal to d1.

In other words, the dielectric layer D of the present invention has a thickness d1 on the upper surface of the electrode E2, and has a surface with a trace of a circle having a radius of d2 almost equal to the thickness d1 at the upper edge of the outer end of the electrode E2. The thickness of the dielectric layer D is set to d3 at a position sufficiently deviated from the outer end of E2, that is, a position which does not contribute significantly to charge formation, so that the path connecting them becomes the surface of the dielectric layer D.

Here, the horizontal line indicated by the dotted line indicates the thickness d 1 ′ of the conventional dielectric layer D. Preferably, the thickness d 1 on the upper surface of the electrode E 2 is larger than the conventional thickness d 1 ′. The thickness d2 is smaller than the conventional thickness d2 'and is formed to be substantially the same as the thickness d1 on the upper surface of the electrode E1. When the traces are continuously connected, the thickness d3 of the dielectric layer D at a position sufficiently far from the electrode E2 is also smaller than the conventional thickness d1 '.

This configuration is a preferred configuration in order to prevent concentration of charge (-) on the electrode E2 in the present invention, but when the problem is not serious, the thickness d1 of the dielectric layer D is not serious. If not, the thickness d1 of the dielectric layer D may be formed to be the same as the conventional thickness d1 ′.

As a result, the completed dielectric layer D has a cross section covering the electrode E2 in the shape of a hat. Then, the hat portion has a relative thickness d1 of the dielectric layer D with respect to the electrode E2. Since d2) becomes substantially the same, when a voltage is applied to the electrode E2, the charge (−) can be uniformly charged over the entire hat portion.

Accordingly, the charge (-) is excessively concentrated on the electrode (E2) to prevent the occurrence of resistance due to mutual exclusion and thus the power consumption, which in turn causes more charge (-) to be charged by the same voltage That means you can. In addition, since the charge (-) is dispersed and formed over a large area, it is advantageous to generate a surface discharge, and thus high luminance can be realized.

Thus, the configuration of Figure 3 in the form of a hat is theoretically optimal, but it is not easy to implement this in the actual manufacturing process.

Accordingly, FIG. 4 illustrates a simplified embodiment, in which an auxiliary dielectric layer D 'having a width corresponding to the width of the electrode E2 is stacked on the dielectric layer D. Referring to FIG. T denoted by a dotted line is a protective layer.

The auxiliary dielectric layer D 'may be printed in a pattern similar or identical to that of the electrode E2 after the entire area of the dielectric layer D is formed, and thus there is no difficulty in forming the auxiliary dielectric layer D'.

The thickness t 'of the auxiliary dielectric layer D' is preferably equal to the thickness t of the electrode E2, which is not only to make the thickness of the entire dielectric layer D uniform, In this case, the same dielectric mask as that of the electrode E2 can be used for the auxiliary dielectric layer D ', which is advantageous in manufacturing.

In the embodiment of FIG. 4, instead of using a curved surface to equalize the thickness of the dielectric layer D, the charge (−) due to the thickness difference is added by adding the auxiliary dielectric layer D ′ on the relatively thin electrode E2. It is to prevent the concentration of the charge and to be able to be distributed decentralized.

As described above, according to the present invention, since the charge (-) is formed over a wide range, it is advantageous to expand discharge, in particular, surface discharge, and there is no loss due to charge concentration.

Claims (3)

In an alternating current plasma display device in which a dielectric layer is formed on one of two electrodes arranged opposite to each other on both substrates, the dielectric layer is capped so that the thickness at the outer end of the dielectric layer is approximately equal to the thickness at the top of the electrode. A dielectric layer of an AC plasma display device, characterized in that formed in the form. The dielectric layer of an AC plasma display device according to claim 1, wherein the hat-shaped dielectric layer is formed by stacking an auxiliary dielectric layer corresponding to the width of the electrode at a position above the electrode. The dielectric layer of an AC plasma display device according to claim 2, wherein the thickness of the auxiliary dielectric layer corresponds to the thickness of the electrode.