KR20080040994A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to improve picture quality and to prevent damage of a barrier rib by using a white barrier rib instead for a colored barrier rib. A first substrate(10) and a rear substrate(20) are arranged opposite to each other. A barrier rib(16) is arranged between the first substrate and the second substrate in order to define discharge cells. An address electrode is extended in a first direction on the first substrate. A display electrode is formed in a second direction crossing the first direction on the second substrate. A phosphor layer is formed in each of the discharge cells. The phosphor layer is colored partially with a first color and is extended in a non-discharge region of an upper side of the barrier rib. A dielectric layer is formed to cover the display electrode and is colored with a second color. The first and second colors have subtractive color mixture relationship.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.

3 is a diagram illustrating subtracted and mixed color relationships between a phosphor layer and a dielectric layer of a plasma display panel according to an exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10 back panel 16 bulkhead

20 Front substrate 28 Dielectric layer

30 ... phosphor layer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel. More particularly, the present invention relates to a plasma display panel in which plasma display panels can improve display efficiency while improving contrast efficiency without damaging partition walls when applying complementary colors to components of the plasma display panel. It is about the panel.

In general, a plasma display panel is a visible light of red (R), green (G) and blue (B) generated by exciting the phosphor by using a vacuum ultraviolet (VUV) emitted from the plasma generated through gas discharge To implement the image. The plasma display panel is classified into a direct current type and an alternating current type according to the supplied driving voltage and the structure of the discharge cell. Hereinafter, a schematic configuration of an alternating current plasma display panel (hereinafter referred to as a 'plasma display panel') will be described.

First, address electrodes are formed on a rear substrate, and the address electrodes are covered with a dielectric layer. The partition walls are disposed between the address electrodes on the dielectric layer to form a stripe or matrix shape. The front substrate is spaced apart from the rear substrate so as to face each other, and display electrodes including a pair of sustain electrodes and scan electrodes are formed along a direction crossing the address electrodes. The display electrode is covered with a dielectric layer and a protective film (MgO protective film). A discharge cell is formed at a point where the pair of address electrodes on the rear substrate and the pair of display electrodes on the front substrate cross each other. Phosphor layers of red (R), green (G), and blue (B) are formed inside the discharge cell.

In the above-described plasma display panel, millions of unit discharge cells are arranged in a matrix form, and an image necessary for discharging the selected discharge cells among these discharge cells is displayed.

In this case, external light incident on the front surface of the plasma display panel is partially reflected from the front surface of the plasma display panel and mixed with visible light displayed by the plasma display panel. In particular, in a bright external condition (bright room condition), external light is more introduced into the discharge cells, thereby decreasing the bright room contrast, thereby degrading the display performance of the image actually expressed by the plasma display panel.

In order to improve the above problems, colors having complementary relations are colored on components such as partition walls, dielectric layers, and protective films of the plasma display panel, thereby reducing external light reflectance.

However, breakage of the partition wall occurs due to the complementary color, causing problems such as scattering of the phosphor and generation of bubbles in the dielectric layer.

The present invention has been made to solve the above-described problems, and when the color of the complementary color is applied to the components of the plasma display panel, it is possible to achieve the improvement of the clear room contrast and the improvement of the display efficiency without damaging the partition wall. The object is to provide a plasma display panel.

Plasma display panel of the present invention for achieving the above object, the first substrate and the second substrate facing each other; Barrier ribs disposed between the first substrate and the second substrate to partition each discharge cell; An address electrode extending in a first direction on the first substrate; A display electrode extending on the second substrate in a second direction crossing the first direction; A phosphor layer formed in each of the discharge cells, the at least part of which is colored in a first color and extended to a non-discharge region above the partition wall; And a dielectric layer covering the display electrode and colored in a second color, wherein the first color and the second color have a color relationship of navy blue mixing.

In the present invention, the area extended to the non-discharge area of the phosphor layer is colored and expanded in the first color.

In the present invention, the first color and the second color are made of complementary colors.

In the present invention, the first color is made of purple (Magenta).

In the present invention, the second color is made of cyan.

In the present invention, the partition wall is made of white color.

Hereinafter, a plasma display panel according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you.

1 is a partially exploded perspective view of a plasma display panel according to an embodiment of the present invention, Figure 2 is a cross-sectional view taken along the line II-II of Figure 1, Figure 3 is a plasma display panel according to an embodiment of the present invention The color relationship subtracted and mixed between the phosphor layer and the dielectric layer is illustrated. 1 to 3, a plasma display panel will be described below.

The plasma display panel includes a first substrate 10 (hereinafter, referred to as a "back substrate") and a second substrate 20 (hereinafter, referred to as a "front substrate") disposed to face each other at intervals. A partition wall 16 partitioning the discharge cells 18 is disposed between the front substrate 20 and the rear substrate 10.

The partition wall 16 is formed at a predetermined height on the dielectric layer 14 between the rear substrate 10 and the front substrate 20 to partition the plurality of discharge cells 18. The discharge cell 18 is filled with a discharge gas (eg, a mixed gas including neon (Ne), xenon (Xe), etc.) to generate vacuum ultraviolet rays by gas discharge, and emits visible light by absorbing the vacuum ultraviolet rays. The phosphor layer 19 is provided. As shown in FIG. 1, the partition wall 16 includes a first partition member 16a formed in a first direction and a second partition member 16b formed in a second direction perpendicular to the first partition member 16a. ), The discharge cells 18 are formed in a matrix structure. In addition, the partition wall may be formed to extend in the first direction, and the plurality of partition walls may be disposed side by side in the second direction to form discharge cells in a stripe structure (not shown). The partition 16 is not colored with a color including a separate color pigment, but is made of a white color. The partition 16 is made of white color that does not contain the colored pigment, thereby preventing damage such as cracking of the partition by the colored pigment.

In the plasma display panel, an address electrode 12 and a display electrode are formed to correspond to each discharge cell 18 between the rear substrate 10 and the front substrate 20 so as to realize an image by gas discharge. 21 and a scanning electrode 22 are provided.

1 and 2, the sustain electrode 21 and the scan electrode 22 cross the address electrodes 12 and are covered with the dielectric layer 28 facing each other corresponding to the discharge cells 18. The dielectric layer 28 forms and accumulates wall charges during discharge while protecting the sustain electrode 21 and the scan electrode 22 from gas discharge. The dielectric layer 28 is covered with the protective film 29. The passivation layer 29 is formed of magnesium oxide (MgO) that protects the dielectric layer 28 to increase the secondary electron emission coefficient upon discharge.

The address electrode 12 extends along the first direction (y-axis direction in the drawing) on the inner surface of the back substrate 10 and continuously corresponds to the discharge cells 18 adjacent in the first direction. . In addition, the plurality of address electrodes 12 are arranged side by side to correspond to adjacent discharge cells 18 in a second direction (the x-axis direction of the drawing) that crosses the first direction. Since the address electrode 12 is disposed on the rear substrate 10 and does not prevent the visible light from being irradiated forward, the address electrode 12 may be formed of an opaque electrode (that is, a metal electrode having excellent conductivity). The address electrode 12 is disposed on the inner surface of the back substrate 10 and covered with the dielectric layer 14. The dielectric layer 14 prevents cations or electrons from directly colliding with the address electrode 12 during discharge, thereby preventing damage to the address electrode 12 and forming and accumulating wall charges.

Meanwhile, the phosphor layer 30 is colored in the first color, and the dielectric layer 28 covering the sustain electrode 21 and the scan electrode 22 is colored in the second color. This first / second color consists of colors in a dark blue blend relationship. That is, the first color colored in the phosphor layer 30 may be made of purple (Magenta), and the second color colored in the dielectric layer 28 may be made of cyan. As shown in FIG. 3, the phosphor layer 30 and the dielectric layer 28 are colored in the color of the dark blue color mixture, thereby greatly improving the contrast contrast and reducing the external light reflectance, thereby reducing the display efficiency of the plasma display panel. Prevent it. However, the present invention is not limited thereto, and the first color and the second color may be formed of different color systems forming a color relationship in which the first color and the second color are subtracted and mixed with each other. Of course, the first color and the second color may be made of complementary colors.

As shown in FIG. 2, the phosphor layer 30 is extended to the upper side of the partition 16, that is, to the non-discharge region. As it is applied to the upper part of the partition wall of the phosphor layer 30, a subtractive mixing action is performed between the dielectric layer 28 and the phosphor layer 30, thereby reducing reflection brightness and improving clear room contrast. The phosphor layer 30 continuously corresponds to the discharge cells 18 formed along the first direction. In addition, the plurality of address electrodes 12 are arranged side by side to correspond to adjacent discharge cells 18 in a second direction (the x-axis direction of the drawing) that crosses the first direction. Since the address electrode 12 is disposed on the rear substrate 10 and does not prevent the visible light from being irradiated forward, the address electrode 12 may be formed of an opaque electrode (that is, a metal electrode having excellent conductivity). The address electrode 12 is disposed on the inner surface of the back substrate 10 and covered with the dielectric layer 14. The dielectric layer 14 prevents cations or electrons from directly colliding with the address electrode 12 during discharge, thereby preventing damage to the address electrode 12 and forming and accumulating wall charges.

On the other hand, the sustain electrode 21 and the scan electrode 22 are provided on the inner surface of the front substrate 20, so that the surface discharge structure corresponding to each discharge cell 18 so as to cause gas discharge in the discharge cell 18 Form. The sustain electrode 21 and the scan electrode 22 extend in a second direction crossing the address electrode 12.

Each of the sustain electrode 21 and the scan electrode 22 includes transparent electrodes 21a and 22a for generating a discharge and bus electrodes 21b and 22b for supplying a voltage signal to the transparent electrodes 21a and 22a, respectively. do. Each of the transparent electrodes 21a and 22a is a part which causes surface discharge in the discharge cell 18, and is a transparent material (eg, indium tin oxide, ITO) to secure the aperture ratio of the discharge cell 18. Is formed. The bus electrodes 21b and 22b are formed of a metal material having excellent conductivity to compensate for the high electrical resistance of the transparent electrodes 21a and 22a.

During the driving of the plasma display panel having the above-described configuration, in the reset period, reset discharge is caused by a reset pulse supplied to the scan electrode 22. In the addressing period following the reset period, address discharge is caused by a scan pulse supplied to the scan electrode 22 and an address pulse supplied to the address electrode 12. Thereafter, in the sustain period, sustain discharge is caused by a sustain pulse supplied to the sustain electrode 21 and the scan electrode 22.

The sustain electrode 21 and the scan electrode 22 function as electrodes supplying sustain pulses necessary for sustain discharge, and the scan electrodes 22 function as electrodes supplying reset pulses and scan pulses. The address electrode 12 functions as an electrode for supplying an address pulse. The sustain electrode 21, the scan electrode 22, and the address electrode 12 may vary in function depending on the voltage waveform supplied to each, but are not necessarily limited to these functions.

The plasma display panel selects a discharge cell 18 to be turned on by the address discharge due to the interaction between the address electrode 12 and the scan electrode 22, and the sustain electrode 21 and the scan electrode 22 are mutually selected. An image is realized by driving the selected discharge cells 18 by sustain discharge due to the action.

  The present invention has been described above with reference to the embodiments shown in the drawings. However, the present invention is not limited thereto, and various modifications or other embodiments falling within the scope equivalent to the present invention are possible by those skilled in the art. Therefore, the true scope of protection of the present invention should be defined by the following claims.

The plasma display panel according to the present invention as described above has the following effects.

First, by forming color relations that are subtracted and mixed between the elements constituting the plasma display panel, the contrast of the bright room is improved to prevent the display efficiency due to the reflection of external light from being lowered, thereby improving the image quality of the plasma display panel.

Second, by applying white partitions, not colored partitions, it is possible to prevent damage of the partitions by the action of the coloring material.

Claims (6)

A first substrate and a second substrate disposed to face each other; Barrier ribs disposed between the first substrate and the second substrate to partition each discharge cell; An address electrode extending in a first direction on the first substrate; A display electrode extending on the second substrate in a second direction crossing the first direction; A phosphor layer formed in each of the discharge cells, the at least part of which is colored in a first color and extended to a non-discharge region above the partition wall; And A dielectric layer covering the display electrode and colored in a second color; And the first color and the second color are blue-mixed. The method of claim 1, And an area of the phosphor layer extended to the non-discharge area is colored and expanded in the first color. The method of claim 1, And the first color and the second color are complementary colors. The method of claim 1, The first color is purple (Magenta) plasma display panel. The method of claim 1, And the second color is cyan. The method of claim 1, The partition wall has a plasma display panel of white color.

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