KR100599681B1 - Plasma display panel - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel for reducing external light reflection luminance to improve clear room contrast of a screen.

A rear substrate and a front substrate disposed to face each other at arbitrary intervals; Address electrodes formed on an opposite surface of the rear substrate to the front substrate; A partition wall disposed in a space between the rear substrate and the front substrate to partition the discharge cells; A fluorescent layer located in each discharge cell; Sustain electrodes formed on a surface opposite to the rear substrate of the front substrate in a direction crossing the address electrode and having a bus electrode; A plasma display panel including an external light absorbing part disposed on a bus electrode is provided.

Plasma, display, address electrode, sustain electrode, bright room contrast, reflected luminance, absorption of external light, partition, fluorescent layer

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 and 4 are partially enlarged cross-sectional views of the front substrate shown in FIG.

5 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 reducing external light reflection luminance to improve bright 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.

5 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 cross each other functions as one discharge cell, and the discharge cells 23R, 23G, and 23B are filled with discharge gas (mainly Ne-Xe mixed gas).

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 of the N s), a plasma discharge is generated in the discharge cell 23R, and vacuum ultraviolet light is emitted, and the vacuum ultraviolet light emits the fluorescent layer 7R. The predetermined display is achieved by exciting the visible light.

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 viewers typically watch PDPs in a bright room environment, it is necessary to increase the clear room contrast for substantial picture quality improvement, and to reduce the external light reflection luminance 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 that can improve the clear contrast of a screen by providing an improved internal structure that can reduce external light reflection luminance.

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

Address electrodes formed on the opposite surface of the back substrate and the front substrate, the front substrate among the back substrates, a partition wall disposed in a space between the back substrate and the front substrate to partition the discharge cells, and located in each discharge cell A plasma display panel including a phosphor layer formed on a surface of the front substrate facing the rear substrate and intersecting with the address electrode and having sustain electrodes including a bus electrode, and an external light absorbing portion disposed on the bus electrode; To provide.

The external light absorbing portion is preferably formed to a larger thickness than the bus electrode, and the bus electrode and the external light absorbing portion are covered with a transparent dielectric layer. The external light absorbing part may be formed of a black insulating layer or a black conductive layer. In the latter case, the external light absorbing part may be electrically connected to the bus electrode.

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, FIG. 2 is a partial plan view showing an assembled state of FIG. 1, and FIG. 3 is a partially enlarged cross-sectional view of the front substrate shown in FIG. 1.

Referring to the drawings, a plasma display panel (hereinafter referred to as a 'PDP') according to the present embodiment is disposed so that the rear substrate 2 and the front substrate 4 are disposed to face each other at random intervals, and in the space between the two substrates. Discharge cells 8R, 8G and 8B which are partitioned off by the partition 6 are provided.

In detail, the address electrodes 10 are formed in one direction (Y direction of the drawing) on the inner surface of the rear substrate 2, and the entire inner surface of the rear substrate 2 is covered while covering the address electrodes 10. The first dielectric layer 12 is located. For example, the address electrode 10 is formed in a stripe pattern and is positioned side by side with a neighboring address electrode 10 at a predetermined interval.

On the first dielectric layer 12, a partition 6, for example, a stripe pattern 6 in parallel with the address electrode 10, is formed, and red over the side surface of the partition 6 and the upper surface of the first dielectric layer 12. , Green and blue fluorescent layers 14R, 14G, 14B are provided in this order. At this time, the shape of the partition wall 6 is not limited to the stripe pattern, but may be formed of a closed structure such as a lattice shape or a pattern other than that.

On the inner surface of the front substrate 4 facing the rear substrate 2, a sustain electrode made up of the scan electrode 16 and the common electrode 18 along the direction crossing the address electrode 10 (X direction in the drawing) ( 20 is formed, and the second dielectric layer 22 and the MgO passivation layer 24 that are transparent are disposed on the entire inner surface of the front substrate 4 while covering the storage electrodes 20.

In this embodiment, the scan electrode 16 and the common electrode 18 are positioned at one edges of the stripe patterned transparent electrodes 16a and 18a and the transparent electrodes 16a and 18a, respectively. It consists of metal bus electrodes 16b and 18b which complement conductivity. Indium tin oxide (ITO) is preferable as the transparent electrodes 16a and 18a, and a mixture of copper (Cu) and chromium (Cr) or silver (Ag) is preferable as the bus electrodes 16b and 18b. Do.

By the combination of the back substrate 2 and the front substrate 4, the discharge space where the address electrode 10 and the sustain electrode 20 intersect constitute one discharge cell 8R, 8G, 8B, and discharge The cells 8R, 8G, 8B are filled with discharge gas (mainly Ne-Xe mixed gas).

Here, the PDP according to the present embodiment provides a configuration to reduce the external light reflection luminance by providing the external light absorbing portion 26 on the bus electrodes 16b and 18b to absorb light incident from the outside into the PDP. The external light absorbing portion 26 is preferably formed to a larger thickness than the bus electrodes 16 and 18b to enlarge the external light absorbing area.

The external light absorbing part 26 may be formed of an insulating material or a conductive material having black or dark color close to black and having external light absorbing ability. In the latter case, the external light absorbing portion 26 may be electrically connected to the bus electrodes 16b and 18b at the terminal portion (not shown) to function as a bus electrode, and may be retained when not connected to the bus electrodes 16b and 18b. During the discharge, the floating potential lower than the bus electrodes 16b and 18b is maintained.

In addition, when the external light absorbing unit 26 is made of a conductive material, the external light absorbing unit 26 may be made of the same material as the bus electrodes 16b and 18b, and in this case, PDP manufacturing is easy.

By the above-described configuration, when the address voltage Va is applied between the address electrode 10 and the scan electrode 16 of the red discharge cell 8R, for 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 22 covering the sustain electrode 20 to select this discharge cell 8R.

Subsequently, when the sustain voltage Vs is applied between the scan electrode 16 and the common electrode 18 of the selected discharge cell 8R, the plasma discharge, from the discharge gap between the scan electrode 16 and the common electrode 18, That is, sustain discharge is started, and vacuum ultraviolet rays are emitted from the excitation atoms of Xe produced at the sustain discharge. The vacuum ultraviolet rays excite the fluorescent layer 14R of the discharge cell 8R to emit visible light, thereby providing a predetermined display.

When the PDP operates in this manner, the external light absorbing unit 26 located on the bus electrodes 16b and 18b absorbs light incident from the outside into the PDP, as shown in FIG. By reducing the screen serves to increase the clear room contrast of the screen.

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, the bright room contrast of the screen is improved by absorbing the light incident from the outside into the PDP from the outside to reduce the reflection brightness. At this time, the external light absorbing portion is formed to have a thickness larger than that of the bus electrode to increase the external light absorbing area to more effectively reduce the reflection brightness of the PDP.

Claims (7)

A rear substrate and a front substrate disposed to face each other at arbitrary intervals; Address electrodes formed on an opposite surface of the rear substrate to the front substrate; A partition wall disposed in a space between the rear substrate and the front substrate to partition discharge cells; A fluorescent layer located in each of the discharge cells; Sustain electrodes formed on the opposite surface of the front substrate from the front substrate in a direction crossing the address electrode and having a bus electrode; And And an external light absorbing part disposed on the bus electrode and configured separately from the bus electrode. The method of claim 1, And the outer light absorbing portion is formed to have a thickness greater than that of the bus electrode. The method according to claim 1 or 2, And the bus electrode and the external light absorbing part are covered with a transparent dielectric layer. The method of claim 1, And the external light absorbing portion is formed of a black insulating layer. The method of claim 1, And the external light absorbing portion is formed of a black conductive layer. The method of claim 5, And the external light absorbing unit is electrically connected to the bus electrode. The method of claim 5, And the external light absorbing part is made of the same material as the bus electrode.

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