KR20050121928A - Plasma display panel - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display panel that can improve contrast in bright room by applying an auxiliary bus electrode for partially shielding light incident into a discharge cell.

An object of the present invention is a first substrate; A second substrate disposed opposite the first substrate; Address electrodes formed on the first substrate; Barrier ribs disposed between the first substrate and the second substrate to define a plurality of discharge cells; A phosphor layer formed in the discharge cell; And display electrodes formed on the second substrate corresponding to the discharge cells and formed of the first and second electrodes, wherein the first and second electrodes extend toward the center of the discharge cell, respectively, and have a pair of transparent electrodes facing each other. A main bus electrode zigzag along a direction crossing the electrode, and an auxiliary bus electrode connected to the main bus electrode with at least two junctions and partially shielding light incident into the discharge cell, the center of the discharge cell The spacing between the transparent electrodes facing each other and the spacing between the auxiliary bus electrodes may be achieved by different plasma display panels.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of improving bright room contrast.

In general, a plasma display panel (PDP) is used to excite phosphors by ultraviolet rays generated by gas discharge, thereby realizing an image, and has been spotlighted as a next-generation display device because it is possible to make a thin and high resolution large screen.

When the PDP is classified according to three subpixels of R (red), G (green), and B (blue), that is, an arrangement pattern of the discharge cells, the discharge cells divided by the partition walls, that is, gas discharge are performed. The stripe may be divided into a stripe type (or inline type) in which spaces are arranged in a stripe pattern, and a delta type in which discharge cells are arranged in a triangular pattern.

Here, the substantial delta arrangement of the R, G, and B subpixels is formed by, for example, a rectangular closed bulkhead disclosed in U.S. Patent No. 5,182,489 and a hexagonal closed bulkhead disclosed in JP-A-6-44907. And the deformable structure of the linear bulkheads disclosed in US Pat. Nos. 6,373,195 and 6,376,986.

In the stripe type and the delta type PDP, both an address electrode and a phosphor layer are formed on a lower substrate corresponding to each discharge cell partitioned by a partition wall, and a display electrode composed of a scan electrode and a sustain electrode is formed on an upper substrate. A dielectric layer is formed on each of the lower substrate and the upper substrate to cover the address electrode and the display electrode. Here, the scan electrode and the sustain electrode each include a transparent electrode made of a transparent material such as ITO, and a bus electrode formed of an opaque metal material avoiding discharge cells to improve resistance characteristics over the transparent electrode.

Accordingly, when an address voltage is applied between the address electrode and the scan electrode in response to the selected discharge cell, the discharge cell to emit light through the address discharge is selected, and a sustain voltage is applied between the scan electrode and the sustain electrode. Plasma discharge occurs to emit vacuum ultraviolet rays, and the vacuum ultraviolet rays excite the phosphor layer of the corresponding discharge cell to emit visible light, thereby realizing an image.

However, as described above, when the scan electrode and the sustain electrode of the upper substrate are made of a transparent electrode and the bus electrode is formed to avoid the discharge cell, it is excellent in terms of securing the aperture ratio, but the absorption efficiency of external light is low when the PDP is operated under the clear condition. The disadvantage is that the contrast of the screen is lowered.

Accordingly, the present invention is to solve the conventional problems as described above, to provide a plasma display panel that can improve the clear contrast by applying an auxiliary bus electrode for shielding part of the light incident into the discharge cell. There is a purpose.

The object of the present invention described above is a first substrate; A second substrate disposed opposite the first substrate; Address electrodes formed on the first substrate; Barrier ribs disposed between the first substrate and the second substrate to define a plurality of discharge cells; A phosphor layer formed in the discharge cell; And display electrodes formed on the second substrate corresponding to the discharge cells and formed of the first and second electrodes, wherein the first and second electrodes extend toward the center of the discharge cell, respectively, and have a pair of transparent electrodes facing each other. A main bus electrode zigzag along a direction crossing the electrode, and an auxiliary bus electrode connected to the main bus electrode with at least two junctions and partially shielding light incident into the discharge cell, the center of the discharge cell The spacing between the transparent electrodes facing each other and the spacing between the auxiliary bus electrodes may be achieved by different plasma display panels.

Here, the spacing between the transparent electrodes may be smaller or larger than the spacing between the auxiliary bus electrodes, in which case the auxiliary bus electrodes are formed on the transparent electrodes.

In addition, the main bus electrode and the auxiliary bus electrode is made of an opaque metal material.

In addition, the partition partitions the discharge cells so that the plurality of subpixels constituting one pixel are arranged in a triangular pattern, and each subpixel has a hexagonal planar shape, and the main bus electrode defines a partition partitioning the subpixel. The discharge cells may be partitioned so that the partition walls have the phosphor layers of the same color adjacent to each other in the direction parallel to the address electrode.

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

1 is a partially exploded perspective view schematically illustrating a plasma display panel according to an exemplary embodiment of the present invention, and FIG. 2 is a partial cross-sectional view illustrating a coupling state of a plasma display panel according to line I-I of FIG. 1.

Referring to the drawings, the PDP of this embodiment has a so-called delta shape in which three subpixels of red (R), green (G), and blue (B) are arranged in a triangular pattern to form a group of pixels.

Looking at the configuration of the delta-type PDP in detail, the first substrate 10 and the second substrate 20 are disposed to face each other at a predetermined interval, between the first substrate 10 and the second substrate 20 A partition 13 having a height corresponding to the gap is formed to partition the pixels.

Here, a set of pixels is composed of three sub-pixels, that is, discharge cells 14R, 14G and 14B arranged in a triangle as described above, and each discharge cell 14R, 14G and 14B is shown in FIG. As shown, it has a substantially hexagonal plane. Accordingly, the partitions 13 constituting one discharge cell 14R, 14G, 14B also have a hexagonal plane, and correspondingly, the discharge spaces formed by the respective discharge cells 14R, 14G, 14B also have an overall shape. It will have a hexagonal plane.

In addition, a discharge gas necessary for the PDP is charged in the internal spaces of the discharge cells 14R, 14G, and 14B, and the R, G, and B phosphor layers 15R, 15G, and 15B are filled in the discharge cells 14R, 14G, and 14B. Are formed respectively. Here, the phosphor layers 15R, 15G, and 15B are formed on both the bottom surface of the discharge space and the side surfaces of the partition wall 13.

In the first substrate 10, the address electrodes 11 are formed to be spaced apart from each other along the first direction (the Y-axis direction in the drawing) corresponding to the respective discharge cells 14R, 14G, and 14B. The dielectric layer 12 is formed on the entire surface of the first substrate 10 while covering the layers.

On one surface of the second substrate 20 facing the first substrate 10, the first electrode 21 as the sustain electrode and the second electrode 22 as the scan electrode correspond to the discharge cells 14R, 14G and 14B. A pair of display electrodes 23 are formed to face each other, and the dielectric layer 24 and the MgO passivation layer 25 are formed on the entire surface of the second substrate 20 while covering the display electrodes 23.

Here, the first electrode 21 and the second electrode 22 extend toward the center of the discharge cells 14R, 14G and 14B, respectively, and the transparent electrodes 21a and 22a facing each other and the transparent electrodes 21a, 22a) at least two main bus electrodes 21b and 22b and main bus electrodes 21b and 22b formed along the partition wall 13 in a second direction (X-axis direction in the drawing) intersecting with the first direction. Auxiliary bus electrodes formed on the transparent electrodes 21a and 22a while being connected to each other and formed near the edges of the transparent electrodes 21a and 22a to partially shield light incident into the discharge cells 14R, 14G and 14B. 21c and 22c, and the main bus electrodes 21b and 22b and the auxiliary bus electrodes 21c and 22c are made of an opaque metal material.

Since the main bus electrodes 21b and 22b are formed along the partition wall 13, the main bus electrodes 21b and 22b have a zigzag shape along the second direction (the x-axis direction of the drawing) of the second substrate 20, and the auxiliary bus electrodes 21c, 22c is formed covering the edges of the transparent electrodes 21a and 21b to absorb external light, thereby partially shielding the light incident into the discharge cells 14R, 14G and 14B.

At this time, the distance between each of the transparent electrodes 21a and 22a and the auxiliary bus electrodes 21c and 22c corresponding to the center of the discharge cells 14R, 14G and 14B is as shown in FIGS. 4 and 5. Preferably, the spacing d1 between the auxiliary bus electrodes 21c and 22c is larger than the spacing d between 22a).

That is, when the distance d1 between the auxiliary bus electrodes 21c and 22c becomes larger than the distance d between the transparent electrodes 21a and 22a, the auxiliary bus electrode 21c by the photolithography process and the etching process becomes larger. 22c) Even if mask misalignment occurs during formation, the short between the first electrode 21 and the second electrode 22 can be prevented by the gap d1 between the widened auxiliary bus electrodes 21c and 22c. The discharge gap formed by the gap d between the first electrode 21 and the second electrode 22 by the transparent electrodes 21a and 22a may be kept constant.

As described above, the case in which the distance d1 between the auxiliary bus electrodes 21c and 22c is made larger than the distance d between the transparent electrodes 21a and 22a has been described. The distance d2 between the transparent electrodes 21a and 22a may be made larger than the distance d between the auxiliary bus electrodes 21c and 22c. In this case, as in the above-described embodiment, the auxiliary process may be performed by photolithography and etching processes. Although mask misalignment occurs when the bus electrodes 21c and 22c are formed, the short between the first electrode 21 and the second electrode 22 can be prevented by the gap d2 between the widened transparent electrodes 21a and 22a. In addition, the discharge gap formed by the gap d between the first electrode 21 and the second electrode 22 by the auxiliary bus electrodes 21c and 22c may be kept constant.

In addition, in the present exemplary embodiment, the delta type PDP in which the partition wall 13 partitions the discharge space so that a plurality of subpixels constituting one pixel are arranged in a triangular shape has been described as an example. Is not limited to this, and the sub-pixels adjacent to each other in the direction parallel to the address electrode 11 have phosphor layers of the same color, and the partition walls are formed such that the R, G, and B sub-pixels adjacent to the address electrodes constitute a set of pixels. The present invention can also be applied to a stripe-type PDP that divides this discharge space.

That is, in the stripe-type PDP, the gap between the transparent electrodes 21a and 22a is made smaller than the gap between the auxiliary bus electrodes 21c and 22c as shown in FIG. 8, or the gap between the transparent electrodes 21a and 22a as shown in FIG. 9. If the width of the auxiliary bus electrodes 21c and 22c is wider than the distance between the auxiliary bus electrodes 21c and 22c, the first electrode 21 may be formed even when mask misalignment occurs when the auxiliary bus electrodes 21c and 22c are formed by the photolithography and etching process as in the above-described embodiments. The short between the second electrode 22 and the second electrode 22 can be prevented, and the discharge gap formed by the gap between the two electrodes can be kept constant.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to

As described above, the plasma display panel according to the present invention can improve the clear room contrast by providing an auxiliary bus electrode for partially shielding light incident into the discharge cell.

Also, by controlling the distance between the transparent electrode and the auxiliary bus electrode when forming the auxiliary bus electrode, the short between the sustain electrode and the scan electrode can be prevented even if misalignment occurs during photolithography and etching process for forming the auxiliary bus electrode. Can improve.

1 is a partially exploded perspective view schematically showing a plasma display panel according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a bonding state of the plasma display panel taken along the line I-I of FIG.

3 is a plan view schematically illustrating an arrangement of discharge cells of a plasma display panel according to an embodiment of the present invention;

4 is a plan view showing electrodes arranged on a second substrate of the plasma display panel according to the embodiment of the present invention;

5 is a cross-sectional view taken along the line II-II of FIG. 4.

6 is a plan view showing electrodes arranged on a second substrate of a plasma display panel according to another embodiment of the present invention;

7 is a cross-sectional view taken along line III-III of FIG. 6;

8 and 9 are respective plan views showing electrodes in which a plasma display panel is arranged on a second substrate, according to another embodiment of the present invention;

Claims (8)

A first substrate; A second substrate disposed opposite the first substrate; Address electrodes formed on the first substrate; Barrier ribs disposed between the first substrate and the second substrate to partition a plurality of discharge cells; A phosphor layer formed in the discharge cell; And Display electrodes formed on the second substrate corresponding to the discharge cells and formed of first and second electrodes; The first and second electrodes extend toward the center of the discharge cell, respectively, and have a pair of transparent electrodes facing each other, a main bus electrode zigzag in a direction crossing the address electrode, and at least two of the main bus electrodes. An auxiliary bus electrode having a plurality of junctions and connected to partially shield light incident to the discharge cell; And a gap between the transparent electrodes facing the center of the discharge cell and a gap between the auxiliary bus electrodes. The method of claim 1, And a spacing between the transparent electrodes is smaller than a spacing between the auxiliary bus electrodes. The method of claim 2, And the auxiliary bus electrode is formed on the transparent electrode. The method of claim 1, And a gap between the transparent electrodes is greater than a gap between the auxiliary bus electrodes. The method of claim 1, And the main bus electrode and the auxiliary bus electrode are made of an opaque metal material. The method of claim 1, The barrier rib partitions the discharge cells such that a plurality of subpixels constituting one pixel are arranged in a triangular pattern. The method of claim 6, Each of the subpixels has a hexagonal planar shape, and the main bus electrode is formed along a partition wall partitioning the subpixels. The method of claim 1, And the partition wall partitions the discharge cells such that adjacent subpixels in a direction parallel to the address electrode have phosphor layers of the same color.