KR20080044667A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to improve the bright room contrast by using subtractive mixture between elements, without separately forming a black stripe layer. A first substrate(10) colored by a first color and a second substrate(20) colored by a second color are opposite to each other, and barrier ribs(16) are interposed between the first and second substrates to define plural discharge cells(18). Address electrodes(12) are extended on the first substrate in a first direction, and display electrodes are extended on the second substrate in a second direction crossing the first direction. A phosphor layer(19) is formed in each discharge cell, and a dielectric layer(14) is formed to cover the display electrodes. A filter is attached to the second substrate, and has light guides(30) formed on the second substrate and a member(40) formed between the light guides for preventing reflection of external light and colored by a third color which is subtractively mixed with the first and second colors.

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.

FIG. 3 is a plan view illustrating color relationships subtracted and mixed between a front substrate, an external light reflection preventing member, and a rear substrate of a plasma display panel according to an exemplary embodiment of the present invention.

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

10; Back substrate 20; Front board

40; External light reflection prevention member

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of preventing external light incident on the front surface of the plasma display panel from being reflected to reduce the display ability of an image.

Typically, a plasma display panel uses red, green, and blue (B) generated by exciting a phosphor using vacuum ultra violet (VUV) emitted from a plasma generated through gas discharge. Realize the image with visible light.

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.

By the way, when the above-described method is used, while the plasma display panel according to the prior art displays an image on the front surface, external light generated from various light sources is incident on the front surface of the plasma display panel.

In this case, the 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 the visible light displayed by the plasma display panel. In particular, in an external bright condition (bright room condition), more external light is introduced into the discharge cells, resulting in a decrease in bright room contrast, thereby degrading display performance of an image actually expressed by the plasma display panel.

In order to solve the above problems, conventionally, a separate black stripe layer is formed on a portion corresponding to the partition wall to reduce reflection of external light due to the front substrate and the dielectric layer.

However, when the black stripe layer is formed separately as in the prior art, there is a problem in that the cost and the process are increased and the production time is increased.

SUMMARY OF THE INVENTION An object of the present invention is to form a colored layer of color relationship subtracted and mixed with elements constituting the plasma display panel, thereby preventing display performance degradation of the plasma display panel due to reflection of external light, and improving image quality by improving contrast in clear room. The present invention provides a plasma display panel.

In order to achieve the above object, the present invention is disposed spaced apart from the first substrate, the first substrate to be colored in the first color, and disposed between the second substrate, the first substrate and the second substrate to be colored in the second color A partition wall partitioning each discharge cell, an address electrode extending in a first direction on the first substrate, a display electrode extending in a second direction crossing the first direction on the second substrate, and a phosphor layer formed in each discharge cell And a dielectric layer covering the display electrode, and a filter attached to the second substrate, wherein the filter includes light guides having an area of incidence surface larger than that of an emission surface in the second substrate, and light guides. It is preferable to include an external light reflection preventing member that is formed, and colored with a third color of the color relationship that is subtracted and mixed with the mixed color of the first color and the second color.

In the above configuration, the first color, the second color, and the third color may be any one of three different primary colors of the navy blue mixture, the first color is made of cyan, and the second color is It is made of yellow and the third color may be made of purple (Magenta).

The first substrate includes one of manganese (Mn), nickel (Ni), and cobalt (Co), and the second substrate includes one of copper (Cu) and antimony (Sb), and reflects external light. The prevention member may include one of chromium (Cr) and bismuth (Bi).

In addition, the first substrate includes one of chromium (Cr) and bismuth (Bi), the second substrate includes one of copper (Cu) and antimony (Sb), and the external light reflection preventing member is manganese (Mn). ), Nickel (Ni), and cobalt (Co).

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

1 is a partial exploded attempt of a plasma display panel according to an exemplary embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.

A configuration of a plasma display panel according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 and 2.

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. The back substrate 10 is formed by coloring the first color, and the front substrate 20 is formed by coloring the second color.

A filter is attached to the front substrate 20. The filter includes a light guide 30 and an external light reflection preventing member 40. The external light reflection preventing member 40 is colored with a third color having a color relationship in which the first color of the rear substrate 10 and the second color of the front substrate 20 are mixed with the color that is subtracted and mixed. With the above configuration, the external light reflection preventing member 40, the front substrate 20, and the back substrate 10 form a color relationship subtracted and mixed with each other, and can prevent the display efficiency of the plasma display panel from being degraded by the external light reflection. have. In addition, the present invention may form a separate black stripe layer by forming a color relationship in which the external light reflection preventing member 40, the front substrate 20, and the rear substrate 10 are colored by respective colors to subtract and mix the components. There is no need, and the image quality of the plasma display panel can be improved by greatly improving the clear room contrast and reducing the external light reflectance.

Here, when the external light reflection preventing member 40 and the front substrate 20 are colored in each color including the coloring raw material component, visible light generated inside the plasma display panel may be transmitted to allow sufficient transparency to realize an image. Colored to have.

The present invention allows the first, second and third colors to be any one of the three primary colors of the dark blue blend. For example, the first color colored on the back substrate 10 is used as cyan, and the second color colored on the front substrate 20 is used as yellow. In addition, the third color to be colored on the external light reflection preventing member 40 may be used as Magenta having a color relationship subtracted and mixed with Green, which is the mixed color of Cyan and Yellow. .

In this case, the back substrate 10 includes a cyan colored raw material component and includes one of manganese (Mn), nickel (Ni), and cobalt (Co). The front substrate 20 includes yellow colored raw material components and includes one of copper (Cu) and antimony (Sb). The external light antireflection member 40 includes a purple colored raw material component and includes one of chromium (Cr) and bismuth (Bi).

However, the present invention is not limited thereto, and the first color to the third color may be formed in a color system constituting a color relationship in which colors are subtracted and mixed with each other.

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.

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.

In this embodiment, the partition wall 16 is formed on the dielectric layer 14 at a predetermined height 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 phosphor layer 19 formed in each of the discharge cells 18 is formed by applying a phosphor paste on the side surface of the partition wall 16 and the surface of the dielectric layer 14 and firing it. The phosphor layer 19 is formed of phosphors of the same color in the discharge cells 18 formed along the first direction. In addition, the phosphor layer 19 is repeatedly formed by the phosphors of red (R), green (G), and blue (B) in the discharge cells 18 repeatedly arranged along the second direction.

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.

Meanwhile, referring to FIGS. 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.

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 interaction between the sustain electrode 21 and the scan electrode 22. An image is realized by driving the selected discharge cells 18 by the sustain discharge.

On the other hand, the external light reflection preventing member 40 according to the embodiment of the present invention is formed on the front surface of the front substrate 20, as shown in FIG. In addition, a plurality of light guides 30 are formed on the top surface of the front substrate 20 in parallel with the first direction. The light guide 30 focuses and emits the visible light generated by the discharge, and may be formed to correspond to the discharge cell 18. The light guide may be formed such that a plurality of light guides correspond to one discharge cell 18 so as to focus and emit visible light generated in the discharge cell 18. In addition, one light guide may be formed corresponding to one discharge cell 18. In addition, the light guide 30 may be formed to correspond to the plurality of discharge cells. The light guide may be formed in a direction crossing the first direction.

Each of the light guides 30 reflects light from its surface, and guides the light entering the incident surface 30a to the exit surface 30b. The light guide 30 has an area of the incident surface 30a larger than that of the emission surface 30b in order to focus visible light generated by the discharge cells 18 and to emit it to the outside. When the light guide 30 is formed on the front substrate 20, the loss of visible light generated by the discharge may be reduced, thereby improving the brightness of the plasma display panel.

On the other hand, the exit surface 30b of the light guide 30 is non-glare. This is to prevent the glare effect generated by the external light reflected from the exit surface 30b of the light guide 30.

The external light reflection preventing member 40 formed on the front substrate 20 is formed in the first direction between the light guides 30 to prevent external light from entering the discharge cell 18. Since the external light reflection preventing member 40 is formed in a region other than the region where visible light is emitted from the upper surface of the front substrate 20, it is possible to effectively prevent the external light from flowing into the discharge cell 18, compared to the prior art, As a result, the clear room contrast of the plasma display panel can be improved. The external light reflection preventing member 40 may include a conductive film for shielding electromagnetic interference (EMI).

As described above, the external light reflection preventing member 40 has a color relationship in which the mixed color of the first color colored on the rear substrate 10 and the second color colored on the front substrate 20 is subtracted and mixed. It is colored in color.

FIG. 3 is a plan view illustrating color relationships subtracted and mixed between a front substrate, an external light reflection preventing member, and a rear substrate of a plasma display panel according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the external light reflection preventing member 40 is overlapped with the first color of the back substrate 10 and the second color of the front substrate 20 through the third color to be colored as shown in FIG. 3. By forming a color relationship that is subtracted and mixed together, black color 24c is prevented and external light incident from the outside is reflected. In addition, the colored back substrate 10 and the front substrate 20 cover the portion (that is, the light guide portion or the non-discharge region) which the external light reflection preventing member 40 cannot cover, thereby realizing the image of the plasma display panel. Contrast can be prevented from falling.

In addition, by coloring the second color of the front substrate 20 and the third color of the external light reflection preventing member 40 to yellow and purple having higher brightness and saturation than black 24c, respectively, the front transmittance of visible light is increased to improve luminance. Can improve display quality.

On the other hand, the detailed description of the present invention has been described with reference to specific embodiments, of course, various modifications are possible without departing from the scope of the invention.

In the above embodiment, the back substrate 10 colored with the first color of cyan, the front substrate 20 colored with the second color of yellow, and the external light reflection preventing member 40 colored with the third color of purple are described. However, one of ordinary skill in the art can improve such subtractive color relationship.

For example, the second color may be used as it is, and the first color and the third color may be different colors. That is, the first color colored on the back substrate 10 may be used in purple, and the second color colored on the front substrate 20 may be used in yellow. In addition, the third color to be colored on the external light reflection preventing member 40 may be used as cyan having a color relationship subtracted and mixed with red, which is a mixed color of the above-mentioned purple (Magenta) and yellow (Yellow). .

In this case, the external light reflection preventing member 40 includes a cyan colored raw material component, and includes one of manganese (Mn), nickel (Ni), and cobalt (Co). The front substrate 20 includes yellow colored raw material components and includes one of copper (Cu) and antimony (Sb). The back substrate 10 includes a purple colored raw material component and includes one of chromium (Cr) and bismuth (Bi).

In addition, since the external light reflection preventing member 40 is colored in a blue (B) -based color, the color temperature may be increased when an image of the plasma display panel is implemented while visible light is transmitted through the external light reflection preventing member 40.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below but also by the equivalents of the claims.

As described above, the plasma display panel according to the present invention forms a color relationship that is subtracted and mixed between the elements constituting the plasma display panel without forming a separate black stripe layer, thereby improving contrast and improving display efficiency due to external light reflection. There is an effect of improving the image quality of the plasma display panel by preventing the degradation.

In addition, it is not necessary to form a black stripe layer separately, it is possible to reduce the cost according to the formation of the black stripe layer, there is an effect that the process is reduced to reduce the production time.

In addition, by reducing the external light reflection by forming a color relationship in which the three primary colors of the navy blue mixture, blue, purple, yellow are subtracted and mixed by different colors on the external light reflection preventing member, the front substrate and the back substrate of the plasma display panel, At the same time, it is possible to reduce the external light reflection brightness and minimize the brightness reduction.

Claims (9)

A first substrate colored in a first color; A second substrate spaced apart from the first substrate and colored in a second color; Barrier ribs disposed between the first substrate and the second substrate to partition respective discharge cells; 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; Phosphor layers formed in the discharge cells; A dielectric layer covering the display electrode; And A filter attached to the second substrate, The filter is Light guides having an area of an incident surface greater than that of an emission surface of the second substrate; And And an external light reflection preventing member formed between the light guides and colored in a third color having a color relationship subtracted from the mixed color of the first color and the second color. The method of claim 1, Wherein the first color, the second color, and the third color comprise any one of three primary colors of the dark blue mixture. The method of claim 2, And the first color is cyan. The method of claim 3, And the second color is yellow. The method of claim 4, wherein And the third color is purple (Magenta). The method of claim 1, And the first substrate comprises one of manganese (Mn), nickel (Ni), and cobalt (Co). The method of claim 6, And the second substrate comprises one of copper (Cu) and antimony (Sb). The method of claim 7, wherein The external light reflection preventing member includes one of chromium (Cr) and bismuth (Bi). The method of claim 1, The first substrate includes one component of chromium (Cr) and bismuth (Bi), The second substrate includes one component of copper (Cu) and antimony (Sb), The external light reflection preventing member includes one of manganese (Mn), nickel (Ni), and cobalt (Co).

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