KR100612354B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel that increases external light absorption area and improves clear room contrast of a screen.

First and second substrates; Address electrodes formed on an opposite surface of the first substrate to the second substrate; A dielectric layer covering the address electrodes and positioned over the entire opposite surface of the first substrate; A partition wall disposed in a space between the first substrate and the second substrate to partition the discharge cells and the non-discharge region; A fluorescent layer located in each discharge cell; A plasma display panel including sustain electrodes formed on a surface opposite to the first substrate of the second substrate along a direction crossing the address electrode, wherein a portion of the dielectric layer corresponding to the non-discharge region is formed of a colored portion having an external light absorption function; to provide.

Plasma, display, bright room contrast, discharge cell, non-discharge area, colored part, blue pigment, black pigment, partition wall

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 partial plan view illustrating the assembled state of FIG. 1. FIG.

3 is a partial cross-sectional view showing the assembled state of FIG.

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

5 is a partial plan view of a plasma display panel illustrating another embodiment of a partition wall.

FIG. 6 is a cross-sectional view taken along the line B-B in FIG. 5.

7 is a cross-sectional view taken along the line C-C of FIG.

8 is a partially exploded perspective view of a plasma display panel according to the prior art.

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 having an internal structure for increasing an external light absorption area to improve a clear room contrast of a screen.

In general, a plasma display panel (PDP) is a display device for realizing an image by exciting phosphors by vacuum ultraviolet rays caused by gas discharge occurring in a discharge cell. It is attracting attention as the next generation thin display device.

8 is a partially exploded perspective view of a PDP according to the prior art.

Referring to the drawings, an address electrode 3, a partition 5, and red, green, and blue fluorescent layers 7R, 7G, and 7B are formed on the rear substrate 1, and a scan electrode () is formed on the front substrate 9. The sustain electrode 15 which consists of 11 and the common electrode 13 is formed. The address electrode 3 and the storage electrode 15 are respectively covered with the first dielectric layer 17 and the second dielectric layer 19, and the MgO passivation layer 21 is positioned on the surface of the second dielectric layer 19.

The discharge space where the address electrode 3 and the sustain electrode 15 intersect serves as one discharge cell 23R, 23G, 23B, and discharge gas (mainly Ne−) inside the discharge cells 23R, 23G, 23B. Xe mixed gas). At this time, the area between the discharge cells set along the address electrode direction (Y direction in the drawing) may be referred to as the non-discharge area 25 in which actual light emission does not occur.

By the above-described configuration, an address voltage Va is applied between the address electrode 3 and the scan electrode 11 to select a discharge cell in which light emission will occur, for example, the red discharge cell 23R, and the selected discharge cell 23R. When the sustain voltage Vs is applied between the scan electrode 11 and the common electrode 13, plasma discharge occurs in the discharge cell 23R. Then, vacuum ultraviolet rays are emitted from the excitation atoms of Xe generated during plasma discharge, and the vacuum ultraviolet rays excite the fluorescent layer 7R to emit visible light, thereby making a predetermined display.

In the PDP operating as described above, there are bright room contrast and dark room contrast as a reference for representing the contrast ratio of the screen. The clear room contrast refers to the contrast when the light source exists outside the PDP and the PDP screen is affected by external light, and the dark room contrast refers to the contrast when the PDP is substantially unaffected by external light.

However, since the viewers usually watch the PDP under the bright room conditions, the viewer needs to increase the bright room contrast for substantial image quality improvement, and to reduce the reflection brightness of the PDP. Therefore, research and development are required to increase the clear contrast of the screen by increasing the external light absorption area to reduce the reflected brightness of the PDP.

Accordingly, an object of the present invention is to provide a plasma display panel which can improve the clear contrast of a screen by providing an improved internal structure capable of increasing an external light absorption area.

In order to achieve the above object, the present invention,

First and second substrates disposed to face each other, address electrodes formed on opposing surfaces of the second substrate among the first substrates, a dielectric layer covering the entire opposing surfaces of the first substrate while covering the address electrodes; A partition wall disposed in a space between the first substrate and the second substrate to partition the discharge cells and the non-discharge region, a fluorescent layer located in each discharge cell, and an address electrode on an opposite surface of the second substrate to the first substrate; The present invention provides a plasma display panel including sustain electrodes formed along a direction intersecting with the plurality of electrodes, wherein a portion of the dielectric layer corresponding to the non-discharge region is formed of a colored portion having an external light absorption function.

The colored portion includes any one or a mixture of black and blue pigments. Preferably, the black pigment is any one or combination of FeO, RuO ₂ , TiO, Ti ₃ O ₅ , Ni ₂ O ₃ , CrO ₂ , MnO ₂ , Mn ₂ O ₃ , Mo ₂ O ₃ , Fe ₃ O ₄ The blue pigment is made of any one or combination of Co ₂ O ₃ , CoO, Nd ₂ O ₃ .

The non-discharge regions are located between the discharge cells in every row or disposed in an area surrounded by a horizontal axis and a vertical axis passing through the center of each discharge cell. In the latter case, the discharge cells are formed narrower as the widths of both ends located along the address electrode direction move away from the center of the discharge cells, and the depth measured from the top of the partition wall at both ends located along the address electrode direction has a discharge cell. The further away from the center of the formed smaller.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a partially exploded perspective view of a plasma display panel according to an exemplary embodiment of the present invention, and FIGS. 2 and 3 are partial plan views and partial cross-sectional views illustrating an assembled state of FIG. 1, respectively.

Referring to the drawings, in the plasma display panel according to the present embodiment (hereinafter referred to as 'PDP'), the first substrate 2 and the second substrate 4 are disposed to face each other at arbitrary intervals, and between the two substrates. In the space, discharge cells 8R, 8G, 8B and non-discharge regions 10 partitioned by the partition 6 are provided.

First, address electrodes 12 are formed on an inner surface of the first substrate 2 along one direction (Y direction in the drawing), and cover the address electrodes 12 to cover the entire first inner layer of the first substrate 2. 14 is located. For example, the address electrode 12 is formed in a stripe pattern and is positioned side by side with a neighboring address electrode 12 at a predetermined interval.

The partition wall 6 is disposed on the first dielectric layer 14 to partition the discharge cells 8R, 8G, and 8B and the non-discharge region 10. Here, the discharge cells 8R, 8G, and 8B are spaces in which gas discharge and light emission are intended to occur, and the non-discharge regions 10 mean areas or spaces in which gas discharge and light emission are not intended. For reference, the drawing shows an embodiment in which the discharge cells 8R, 8G, 8B and the non-discharge region 10 are each formed to have independent cell structures.

The partition wall 6 partitions the discharge cells 8R, 8G, and 8B along the address electrode direction (Y direction in the figure) and the direction crossing the address electrode (X direction in the figure), and each discharge cell 8R. , 8G, 8B) is optimized in consideration of the diffusion form of the discharge gas.

The optimized structure of the discharge cells 8R, 8G, and 8B is a shape in which each of the discharge cells 8R, 8G, and 8B minimizes a small portion that substantially contributes to sustain discharge and brightness enhancement. It means a shape in which the widths of both ends positioned in the discharge cells 8R, 8G, and 8B along the address electrode 12 direction become narrower from the center of the discharge cells 8R, 8G, and 8B.

That is, referring to FIG. 1, the width Wc at the center of the discharge cells 8R, 8G, and 8B is made larger than the width We at the end, and the width We at the end is the discharge cell 8R, The narrower the distance from the center of 8G, 8B). As a result, both ends of the discharge cells 8R, 8G and 8B have a trapezoidal shape, and the overall planar shape of each discharge cell 8R, 8G and 8B is octagonal.

And assuming that the virtual horizontal axis (H) and the vertical axis (V) passing through the center of each discharge cell (8R, 8G, 8B), the non-discharge area (10) in the area surrounded by the horizontal axis (H) and the vertical axis (V) ) Is located. Thus, in the above structure, one common non-discharge region (i.e., one discharge cell between a pair of discharge cells adjacent in the direction of the address electrode 12 and a pair of discharge cells neighboring in the direction orthogonal to the address electrode 12) 10) is located.

Accordingly, the partition wall 6 has a first partition member 6a in a direction parallel to the address electrode 12 and a second partition member connecting the first partition member 6a without being parallel to the address electrode 12. 6B, the second partition member 6b is formed to intersect the first partition member 6a at a predetermined inclination angle. In particular, in the present embodiment, the second partition member 6b has an approximately X shape between discharge cells neighboring in the direction of the address electrode 12.

In the discharge cells 8R, 8G, and 8B, red, green, or blue phosphors are applied, respectively, to form the fluorescent layers 16R, 16G, and 16B.

Referring to FIG. 3, the depth measured from the upper end of the partition 6, that is, the upper end of the second partition member 6b at both ends of the neighboring discharge cells 8R along the address electrode direction (Y direction in the drawing) is The further away from the center of the discharge cell 8R, the smaller it is formed. That is, the depth De at the end of the discharge cell 8R is smaller than the depth Dc at the center portion, and the depth De at the end gradually becomes shallower as it moves away from the center of the discharge cell 8R. The depth characteristics of the discharge cells 8R are equally applied to the green discharge cells 8G and the blue discharge cells 8B.

On the other hand, the inner surface of the second substrate 4 facing the first substrate 2 is composed of the scan electrode 18 and the common electrode 20 along a direction orthogonal to the address electrode 12 (the X direction in the drawing). The storage electrode 22 is formed, and the second dielectric layer 24 and the MgO passivation layer 26 are disposed on the entire inner surface of the second substrate 4 while covering the storage electrodes 22.

The scan electrode 18 and the common electrode 20 are each formed from the bus electrodes 18a and 20a provided in a stripe pattern at the periphery of each of the discharge cells 8R, 8G and 8B and from the bus electrodes 18a and 20a. It consists of the protruding electrodes 18b and 20b extended toward the center part of the discharge cells 8R, 8G, and 8B and positioned with the discharge gap G interposed therebetween. In particular, in the present embodiment, the protruding electrodes 18b and 20b have a shape in which a rear end portion connected to the bus electrodes 18a and 20a is narrowed toward the bus electrodes 18a and 20a. Both sides of the end portion may be located in parallel with the inner wall of the discharge cells 8R, 8G, 8B.

The bus electrodes 18a and 20a are preferably metal electrodes such as silver (Ag), aluminum (Al) or copper (Cu), and the protruding electrodes 18b and 20b are indium tin oxide (ITO). transparent electrode having excellent light transmittance such as oxide) is preferable.

In addition, the first dielectric layer 14 includes a portion 14a having an external light absorbing function corresponding to the non-discharge region 10 to enlarge the external light absorbing area of the PDP. FIG. 4 is a cross-sectional view taken along the line AA of FIG. 1, wherein the colored portion 14a includes any one of black pigment and blue pigment or a mixture thereof, and exhibits black or blue or dark blue near black, thereby showing the non-discharge region 10. Color.

Preferably, the black pigment is any one or combination of FeO, RuO ₂ , TiO, Ti ₃ O ₅ , Ni ₂ O ₃ , CrO ₂ , MnO ₂ , Mn ₂ O ₃ , Mo ₂ O ₃ , Fe ₃ O ₄ The blue pigment is made of any one or combination of Co ₂ O ₃ , CoO, Nd ₂ O ₃ . When the non-discharge area 10 is blue because the coloring part 14a includes a blue pigment, color purity and color temperature of the screen may be improved.

As described above, in the first dielectric layer 14 including the coloring portion 14a, the coloring portion 14a is first formed at a position corresponding to the non-discharge region 10 after the address electrode 12 is formed, and the remaining first substrate 2 is formed. ) Can be easily manufactured by coating the whole with a white dielectric.

The first substrate 2 and the second substrate 4 having the above-described configuration are bonded to each other by a sealing material such as a frit (not shown), and the discharge gas (mainly Ne-Xe mixed gas) is filled therein. Sealed to form a PDP.

By the above-described configuration, when the address voltage Va is applied between the address electrode 12 and the scan electrode 18 of the red discharge cell 8R as an example, the address discharge occurs in the discharge cell 8R, and the address discharge occurs. As a result, wall charges are accumulated on the second dielectric layer 24 covering the sustain electrode 22 to select this discharge cell 8R.

Subsequently, when the sustain voltage Vs is applied between the scan electrode 18 and the common electrode 20 of the selected discharge cell 8R, from the discharge gap G between the scan electrode 18 and the common electrode 20. Plasma discharge is initiated, and vacuum ultraviolet rays are emitted from excitation atoms of Xe produced during plasma discharge. The vacuum ultraviolet rays excite the fluorescent layer 16R of the discharge cell 8R to emit visible light, thereby providing a predetermined display.

At this time, the plasma discharge generated by the sustain voltage Vs is diffused and extinguished in an arc shape toward the outer portion of the discharge cell 8R. In this embodiment, each discharge cell 8R, 8G, As 8B) is formed in accordance with the diffusion form of the plasma discharge, efficient sustain discharge occurs over the entire areas of the discharge cells 8R, 8G, and 8B, thereby improving the discharge efficiency.

The discharge cells 8R, 8G, and 8B have a cross-sectional shape shown in FIG. 3, and the discharge cells 8R, 8G, and 8B are formed in the fluorescent layers 16R, 16G, and 16B with respect to discharge regions toward the outer edges of the discharge cells 8R, 8G, and 8B. The contact area is increased to increase luminous efficiency, and further, the non-discharge region 10 located between the discharge cells 8R, 8G, and 8B improves heat dissipation characteristics by absorbing heat from neighboring discharge cells and dissipating it out of the PDP. Do it.

In addition, in the present embodiment, as the first dielectric layer 14 corresponding to the non-discharge region 10 includes the colored portions 14a, the entire non-discharge region 10 is colored to expand the external light absorption area. Therefore, the entire non-discharge region 10 penetrates the second substrate 4 and absorbs the light incident into the PDP, thereby reducing the reflection brightness of the screen, thereby improving the clear contrast of the screen.

5, 6, and 7, the partition wall 28 has a direction in which the first partition member 28a intersects the address electrode direction (Y direction in the drawing) and the address electrode (in the drawing). Each of the discharge cells 30R, 30G, and 30B in a rectangular shape. The discharge cells of each row are arranged at regular intervals from the discharge cells of the other rows so as to discharge each row. The non-discharge area 32 is positioned between the cells.

At this time, a portion of the first dielectric layer 14 corresponding to the non-discharge region 32 is formed by the colored portion 14b of the stripe pattern to enlarge the external light absorption area of the PDP.

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, according to the exemplary embodiment of the present invention, a portion corresponding to the non-discharge region of the first dielectric layer is formed of a colored portion having an external light absorbing function to enlarge the external light absorbing area of the PDP. Therefore, when the PDP is operated under the bright room condition, the entire non-discharge area absorbs external light to reduce the reflected brightness of the screen, thereby improving the clear room contrast of the screen.

Claims (11)

A front substrate and a rear substrate disposed to face each other at arbitrary intervals; Address electrodes formed on the rear substrate; A dielectric layer on the entire back substrate covering the address electrodes; A partition wall disposed in a space between the front substrate and the rear substrate to partition discharge cells and a non-discharge region; A fluorescent layer located in each of the discharge cells; And Sustain electrodes formed on a surface opposite to the rear substrate of the front substrate along a direction crossing the address electrode; And a portion of the dielectric layer corresponding to the non-discharge region is formed of a colored portion having an external light absorption function. The method of claim 1, And the colored portion comprises any one or a mixture of black and blue pigments. The method of claim 2, The black pigment is selected from the group consisting of FeO, RuO ₂ , TiO, Ti ₃ O ₅ , Ni ₂ O ₃ , CrO ₂ , MnO ₂ , Mn ₂ O ₃ , Mo ₂ O ₃ , Fe ₃ O ₄ and mixtures thereof At least one pigment being plasma display panel. The method of claim 2, And the blue pigment is at least one pigment selected from the group consisting of Co ₂ O ₃ , CoO, Nd ₂ O _3, and mixtures thereof. The method of claim 1, And the non-discharge area is positioned between discharge cells of every row. The method of claim 1, And the non-discharge area is disposed in an area surrounded by a horizontal axis and a vertical axis passing through the center of each discharge cell. The method of claim 6, And wherein the discharge cells are formed narrower as the widths of both ends located in the direction of the address electrodes move away from the center of the discharge cells. The method of claim 6, And the discharge cell is formed to be smaller as the depth measured from an upper end of the barrier rib at both ends positioned along the address electrode direction is farther from the center of the discharge cell. The method of claim 6, And a second partition wall member formed so that the partition wall crosses the first partition wall member parallel to the address electrode and the first partition wall member has a predetermined inclination angle. The method of claim 1, And a pair of bus electrodes positioned at the periphery of each discharge cell, and a pair of protruding electrodes extending from the bus electrode toward the center of each discharge cell and facing each other with a discharge gap therebetween. The method according to claim 7 or 10, And the protruding electrode has a shape in which a rear end portion of the protruding electrode is gradually narrowed toward the bus electrode.

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