KR20040069678A - AC-PDP having different pitch value between barrier ribs - Google Patents

Abstract

PURPOSE: A surface-discharge AC-plasma display panel for multi-screen is provided to reduce the deviation of luminance and improve the uniformity in a multi-screen forming process by forming differently pitches between barrier ribs according to each region within the AC-plasma display panel. CONSTITUTION: A surface-discharge AC-plasma display panel for multi-screen includes a plurality of discharge cells having address electrodes, X electrodes, and Y electrodes, and a plurality of barrier ribs for partitioning the discharge cells. The surface-discharge AC-plasma display panel for multi-screen includes a barrier rib structure for increasing a pitch between the barrier ribs according to the traveling direction of the pulse waveform applied to one electrode.

Description

AC-PDP having different pitch value between barrier ribs}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (PDP), and more particularly, to a luminance deviation according to a distortion of a waveform applied to an X electrode and a Y electrode in a PDP used for a multi screen device. The present invention relates to a surface discharge AC plasma display panel capable of minimizing a discharge voltage difference.

PDP is a light emitting device that displays an image by exciting phosphor formed in a discharge cell.It is light compared to the existing CRT (Cathod Ray Tube), its manufacturing process is simple, and its thin and large screen makes it easy to display the status of stock exchanges. As a video display device used for video conferencing displays and large wall-mounted TVs in recent years, its use has been greatly increased.

1 is an exploded perspective view showing a state in which a general PDP is separated, and FIG. 2 shows a structure in which the X electrode and the Y electrode are drawn out in one direction to the PDP used in the configuration of the multi-screen device.

In the PDP, the front substrate 10 on which the X electrode and the Y electrode are formed and the rear substrate 20 on which the address electrode is formed are sealed in parallel with a predetermined distance therebetween.

The front substrate 10 includes an X electrode and a Y electrode for maintaining light emission of a cell described later by mutual discharge in one pixel, and the X electrode and the Y electrode are transparent electrodes (or ITO electrodes) formed of a transparent ITO material. (Xa, Ya) and the bus electrodes Xb, Yb made of metal.

The X electrode and the Y electrode are covered by a dielectric layer 12 which limits the discharge current and insulates the electrode pairs, and a protective layer 13 is formed on the upper surface thereof.

The rear substrate 20 has a plurality of discharge spaces, that is, stripe-type (or dot-type) barrier ribs 21 for forming the cells C and are arranged vertically while keeping the electrodes (X, Y) The address electrode A is disposed parallel to the partition wall 21 so as to intersect with each other, and a dielectric layer 23 is formed thereon.

In addition, the upper surface of the rear substrate 20 is coated with an R.G.B fluorescent layer 24 that emits visible light for image display at the address discharge except the upper surface of the partition wall 21.

However, these PDPs are currently being developed up to 63 inches due to technical limitations or equipment limitations.

Therefore, for the display of the advertisement requires the characteristics of large, thin and high brightness, PDP is constantly demanded for a larger size.

In order to satisfy such a demand, a multi-screen device in which a large number of PDPs are arranged to form a large screen is used. For this purpose, a PDP in which the X electrode and the Y electrode are drawn in only one direction may be used. That is, in the case of configuring a large screen by arranging four PDPs, as shown in FIG. 2, X and Y electrodes are drawn out in only one direction without drawing electrodes at the ends of PDPs which are in contact with each other, and thus there is no gap between the PDPs. It has a close connection.

However, in order to form a multi-screen as described above, when the electrode is pulled out in only one direction and a pulse is applied through the electrode, as the electrode is moved away from the electrode pad to which the electrode is applied, the impedance of the electrode becomes high, resulting in a distortion of the pulse. Deepen. However, in the PDP for multi-screen, like the single-screen PDP, the partitions 21 are provided at regular intervals orthogonal to the electrodes.

In other words, the pulse applied from the electrode pad is severely distorted toward the opposite end of the electrode pad, but the discharge space (C) is formed in the same size with a constant pitch between the partition walls of the leading end and the leading end to which the pulse is applied Between the opposite sides, a difference in luminance and discharge voltage between discharge cells (discharge regions) occur.

This increase in local discharge voltage makes it difficult to drive at the same voltage when driving the entire panel, resulting in a small operating margin, which is directly related to yield problems.

Accordingly, an object of the present invention for solving the above problems is the difference in the discharge voltage for each region of the PDP due to the distortion of the pulse applied to the X electrode and the Y electrode in the PDP in which the X electrode and the Y electrode are drawn in one direction And to minimize the luminance deviation.

1 is an exploded perspective view showing a state in which a typical PDP is separated.

2 is a diagram showing an electrode structure of a PDP in which X electrodes and Y electrodes are drawn in one direction to form a multi-screen device;

3 is a diagram illustrating a PDP having different pitches between partition walls according to regions according to the present invention.

Plasma display panel of the present invention for achieving the above object is composed of a plurality of discharge cells having an address electrode and X, Y electrodes, in the plasma display panel comprising a partition for separating each discharge cell, It has a partition structure in which the pitch between partition walls is gradually increased in accordance with the advancing direction of the applied pulse waveform.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

First, in the PDP of the present invention, a plurality of PDPs are interconnected to be used as a large display device, and the X electrode and the Y electrode are drawn out to only one side of the panel as shown in FIG. 2 for close connection between the PDPs. The X electrodes and the Y electrodes are each arranged in pairs alternately and in parallel.

3 is a diagram illustrating a PDP having different pitches between partition walls according to regions according to the present invention.

According to the PDP of the present invention, as shown in FIG. 3, the gaps between the partition walls disposed perpendicular to the X electrode and the Y electrode according to the distance from the electrode pad to which the pulse waveform is applied to the X electrode (not shown) and the Y electrode (not shown) are shown. (Pitch) is formed differently. That is, as the distance from the electrode pad increases, the pitch between the partition walls increases, so that the discharge space is widened.

① The area is the area adjacent to the electrode pad and corresponds to the start of the X electrode and the Y electrode, and the pitch between the partition walls is minimum. (3) The area is the area farthest from the electrode pad and corresponds to the last ends of the X and Y electrodes, and the pitch between the partition walls is maximum.

The area ② is an intermediate area between the areas ① and ③, and the pitch between the partition walls of the area ② is determined by the increase in the pitch between the partition walls between the areas ① and ③. At this time, it is preferable that the maximum partition wall pitch is equal to or less than twice the minimum partition wall pitch. In the case of 42 "plasma display panel, when the electrode is pulled out in one direction, the luminance deviation occurring between ① region and ③ region is experimentally showed 40% non-uniformity, which is larger than 2 times according to the size of plasma display panel. It is possible to adjust to be smaller or smaller.

In the present invention, the pitch between the barrier ribs according to the embodiment is different, and the distance between the barrier ribs is gradually increased in a predetermined ratio in units of R, G, and B phosphor cells as the distance from the electrode pad increases, or the pulse applied to the electrode pad After the PDP is divided into several regions according to the advancing direction, the pitch between the partition walls may be constant within each region, and the pitch between the partition walls may be gradually increased.

As the barrier rib forming method, any barrier rib forming method conventionally used may be used, and the pitch thereof may be appropriately adjusted when the barrier rib is patterned.

As the barrier rib forming method, a screen print method, a sandblast method, a Low Temperature Cofired Ceramic on Metal (LTCC-M) method, a direct etching method, and the like may be used.

In addition, in the above-described embodiment, the case in which the barrier rib structure is a stripe type has been described, but the same applies to the case in which the barrier rib structure is a grid type.

As described above, by forming the pitch between the partition walls differently for each area of the PDP, the luminance deviation of each area of the PDP can be reduced to improve the quality of the PDP, and in particular, the uniformity can be improved when forming a multi-screen. In addition, since the discharge voltage can be made uniform throughout, a wide operating margin can be obtained, and yield improvement can be expected.

Claims (4)

In a plasma display panel comprising a plurality of discharge cells having an address electrode and a pair of X and Y electrodes, and having partition walls for separating the discharge cells, And a barrier rib structure in which a pitch between the barrier ribs is gradually increased according to an advancing direction of a pulse waveform applied to the at least one electrode. In a plasma display panel comprising a plurality of discharge cells having an address electrode and a pair of X and Y electrodes, and having partition walls for separating the discharge cells, And a barrier rib structure having different pitches between the barrier ribs divided into a plurality of regions according to an advancing direction of the pulse waveform applied to the at least one electrode. The method according to claim 1 or 2, The pitch between the barrier ribs increases at a constant rate as the distance from the electrode pad to which the pulse waveform is applied to the electrodes increases at a constant rate. The method according to claim 1 or 2, And the X and Y electrodes are drawn out to only one side of the panel to receive the pulse waveform.