KR20010048050A - Electroad of plasma display panel - Google Patents

Abstract

PURPOSE: An electrode of a plasma display panel is provided to prevent unnecessary discharge in an electrode extended to the outer side of a dissepiment located at the edge side of a back panel, thereby improving a contrast of a screen. CONSTITUTION: In an electrode of a plasma display panel, a back panel(20) has a plurality of barrier rips, wherein the barrier rips are parallel to each other and a phosphor is applied on the barrier rips. A front panel(10) has a transparent electrode and a bus electrode. The transparent electrode and the bus electrode(11b) are sealed to the upper side of the back panel to discharge. The transparent electrode includes a discharge prevention part integrally to prevent a discharge at both side ends of the outer part of an available screen.

Description

Electrode of plasma display panel {Electroad of plasma display panel}

The present invention relates to a plasma display panel, and more particularly, to prevent discharge and light emission from occurring outside the area of the effective screen of the plasma display panel, thereby reducing power consumption and improving screen contrast. It relates to an electrode of a plasma display panel.

Recently, the importance of the image display device (or the image display device) has become more important as the development of high-definition television is partially completed and the improvement plan for this is continuously studied. As such a type of image display device, as is known, a color cathode ray tube (CRT), a liquid crystal display (LCD), a fluorescent display (VFD), a plasma display panel (hereinafter referred to as PDP), etc. There is this.

However, since it is not technically completed as a display element that can be satisfied with the development of high definition television (High Definition TeleVision), it is being developed while maintaining a complementary relationship at different positions.

Among the image display apparatuses, the plasma display panel is used to display an image by using a gas discharge phenomenon, has the most promising resolution and roughness ratio in this field, is fast in response, and suitable for displaying a large area image. Widely used in applications such as televisions, monitors, and indoor and outdoor advertising display panels.

1 and 2 illustrate an exploded perspective view showing a state in which a typical plasma display panel is separated and a cross-sectional view showing a combined state.

In other words, the rear substrate shown in FIG. 2 is rotated 90 ° with respect to the front substrate for better understanding.

That is, in the plasma display panel, the front substrate 10, which is the display surface on which an image is displayed, and the rear substrate 20 forming the rear surface are coupled in parallel with a predetermined distance therebetween.

Under the front substrate 10, a sustain electrode 11 for maintaining light emission of a cell by mutual discharge in one pixel, that is, a transparent electrode (or ITO electrode) 11a formed of a transparent ITO material and a metal material The sustain electrodes 11 provided as the manufactured bus electrodes 11b are installed in pairs. The sustain electrode 11 is covered by a dielectric layer 12 that limits a discharge current and insulates electrode pairs, and a protective layer 13 is formed on an upper surface thereof.

In the rear substrate 20, a plurality of discharge spaces, that is, stripe-type barrier ribs 21 for forming a cell, are arranged in parallel with each other, and an address discharge is performed at a portion that intersects with the sustain electrode 11 to perform vacuum ultraviolet rays. A plurality of address electrodes 22 are generated in parallel to the partition wall 21.

In addition, an upper surface of the rear substrate is coated with an R.G.B fluorescent layer 23 that emits visible light for image display during address discharge in a state in which only the top surface of the barrier 21 is removed.

The image display process of the cells in the PDP according to the prior art configured as described above is roughly described as follows.

First, when a voltage of 150 V to 300 V is supplied to the sustain electrode 11 and the address electrode 22 in an arbitrary discharge cell, writing is performed inside the cell located between the sustain electrode 11 and the address electrode 22. The discharge occurs to form wall charges on the inner surface of the discharge space.

After that, when the sustain discharge voltage is supplied to the sustain electrode 11, the sustain discharge occurs easily due to the wall charges formed during the address discharge between the address electrode 22 and the sustain electrode 11, and thus the light emission of the cell in which the write discharge occurs is fixed. Is maintained.

That is, an electric field is generated inside the cell by the discharge between the electrodes, and the trace electrons in the discharge gas are accelerated. Neutral particles are ionized into electrons and ions at a rapid rate due to other collisions, and the discharge gas becomes a plasma state and vacuum ultraviolet rays are generated.

When the generated ultraviolet rays excite the fluorescent layer 23 to generate visible light, and the generated visible light is emitted to the outside through the front substrate 10, external light emission, that is, image display may be recognized. Will be.

After that, when a discharge voltage of 150 V or more is supplied to the sustain electrode 11, a sustain discharge occurs between the sustain electrodes 11 in the discharge cell, so that light emission of the cell is maintained for a predetermined time.

However, the following problems occur in the sustain electrode of the plasma display panel as described above.

That is, as described above, the sustain electrode 11 provided as the transparent electrode 11a and the bus electrode 11b extends in parallel to the outside of the partition wall 21 positioned at the edge of the rear substrate 10. The discharge voltages are supplied to both end portions to generate discharges at all portions where the sustain electrodes 11 are present.

However, in the discharge phenomenon, the discharge is more likely to occur in the part without the phosphor 23 and in the part where the space is large, that is, the part without the partition 21 (or the outside area instead of the effective screen area).

Accordingly, as shown in FIG. 3, the sustain electrode is extended to the outside of the partition wall, which is not an area of the effective screen to be emitted by the discharge, that is, an unnecessary outer area located at the edge of the rear substrate. There is a problem in that the power consumption is increased by the discharge generated in the light emitting device and the contrast of the screen is lowered as light is diffused and emitted in unnecessary areas of the screen.

In addition, the edges of the transparent electrodes facing each other, such as the portion indicated by "A" of FIG. 3, face each other and have a vertex shape, so that an electric field may be concentrated at the portions, and thus insulation of the transparent electrodes may be destroyed. Could not be excluded.

Therefore, the technical problem to be solved by the present invention, that is, the object of the present invention was created in order to solve the problem of the sustain electrode of the conventional plasma display panel, not the effective screen area of the plasma display panel, that is, the rear In the electrode extending to the outer side of the partition wall located at the edge of the substrate, the discharge is prevented from being generated unnecessarily to reduce the power consumption, and accordingly block the light emission, thereby improving the contrast of the screen. To provide an electrode.

Another object of the present invention is to provide an electrode of a plasma display panel which prevents concentration of an electric field at the transparent electrode end of the sustain electrode and thereby eliminates the possibility of breakdown of the insulation of the transparent electrode.

1 is an exploded perspective view for showing a typical plasma display panel.

2 is a cross-sectional view showing a coupling state of FIG.

3 is a plan view showing a state in which a sustain electrode is installed in a typical plasma display panel.

Figure 4 is an exploded perspective view showing a plasma display panel to which the present invention is applied.

5 is a plan view showing a state in which a sustain electrode is installed in a plasma display panel to which the present invention is applied.

*** Explanation of symbols for main parts of drawing ***

10,20; front and rear substrate 11; holding electrode

11a; transparent electrode 11b; bus electrode

11 c; anti-discharge 12; dielectric layer

13; protective layer 21; partition

In order to achieve the above object, the present invention is a rear substrate having a plurality of partitions arranged in parallel and the phosphor is coated, the front substrate having a transparent electrode and a bus electrode for sealing the discharge on the upper side of the rear substrate In the electrode of the plasma display panel provided, the transparent electrode is provided with an electrode of the plasma display panel, characterized in that the discharge prevention unit is integrally provided to prevent the discharge is generated locally at both ends thereof.

In an embodiment of the present invention, the discharge preventing unit is preferably provided with an inclined surface formed inclined toward the bus electrode side from the inside of the transparent electrode adjacent to the outer surface of the partition wall disposed at the edge.

In another embodiment of the present invention, the inclined surface is preferably provided with a large radius of curvature.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention for achieving the above object will be described in detail.

In other words, for convenience of description, the same parts and members as in the prior art will be described with the same reference numerals as in the prior art.

4 to 5 are exploded perspective views showing a state in which the first embodiment according to the present invention is applied and a cross-sectional view showing a combined state.

As shown in the drawing, the plasma display panel to which the present invention is applied has front and rear substrates 10 and 20 coupled in parallel with a constant interval therebetween.

Below the front substrate 10, a sustain electrode 11 provided as a transparent electrode 11a and a bus electrode 11b for maintaining light emission of a cell is arranged.

The sustain electrode 11 is covered by the dielectrically formed dielectric layer 12 and the protective layer 13, and the rear substrate 20 is installed below (or behind) the structure, which is generally described above in the related art. It is similar to the structure of the plasma display panel.

However, the dominant feature of the present invention is that the transparent electrode 11a of the sustain electrode 11 is integrally provided with a discharge preventing portion 11c which prevents local discharge from occurring at opposite ends thereof.

The discharge preventing part 11c may be provided as an inclined surface that is inclined toward the bus electrode 11b side from the inside of the transparent electrode 11a protruding from the outer surface of the partition wall 21 disposed at the edge. .

More preferably, the inclined surface is preferably provided with a large radius of curvature.

The operation of the present invention configured as described above will be described.

First, when a voltage of 150 V to 300 V is supplied to the sustain electrode 11 and the address electrode 22 in an arbitrary discharge cell, writing is performed inside the cell located between the sustain electrode 11 and the address electrode 22. The discharge occurs to form wall charges on the inner surface of the discharge space.

After that, when the sustain discharge voltage is supplied to the sustain electrode 11, the sustain discharge occurs easily due to the wall charges formed during the address discharge between the address electrode 22 and the sustain electrode 11, and thus the light emission of the cell in which the write discharge occurs is fixed. Is maintained.

That is, an electric field is generated inside the cell by the discharge between the electrodes, and the trace electrons in the discharge gas are accelerated. Neutral particles are ionized into electrons and ions at a rapid rate due to other collisions, and the discharge gas becomes a plasma state and vacuum ultraviolet rays are generated.

When the generated ultraviolet rays excite the fluorescent layer 23 to generate visible light, and the generated visible light is emitted to the outside through the front substrate 10, external light emission, that is, image display may be recognized. Will be.

After that, when a discharge voltage of 150 V or more is supplied to the sustain electrode 11, a sustain discharge occurs between the sustain electrodes 11 in the corresponding discharge cell, and the light emission of the cell is maintained for a predetermined time. Same operation.

However, at this time, the feature of the present invention is integrally provided with a discharge preventing portion 11c, which is a feature of the present invention, on the transparent electrode 11a of the sustain electrode 11 protruding outside the partition 21, that is, outside the area of the effective screen. The structure does not cause discharge in that portion.

More specifically, the transparent electrodes 11a of the sustain electrodes 11 protruding to the outside of the partition wall 21, which are outside the area of the effective screen, are respectively required to be discharged by the structure formed outwardly and having a wide interval therebetween. Even if the voltage is supplied, the discharge and the light emission accordingly are not generated in the portion, that is, the portion in which the discharge preventing portion 11c is provided.

Therefore, light emission due to discharge is generated from the sustain electrode extending to the outer side of the partition wall located at the edge of the rear substrate, rather than the area of the effective screen as in the prior art, and thus the contrast decrease of the screen and the consumption due to the discharge. The problem of increased power is actively solved.

In addition, the conventional problem that the electric field is concentrated in the corner portion, which is the end of the transparent electrode, and thus the insulation of the transparent electrode is likely to be broken is also solved.

As described in detail above, according to the present invention, the discharge is prevented from occurring in the electrode which extends to the outside of the partition located at the edge of the rear substrate, not in the area of the effective screen, thereby reducing power consumption. Accordingly, there is a feature to improve the contrast of the screen by blocking the light emission.

In addition, the present invention has a feature that prevents the electric field from being concentrated at the transparent electrode end of the sustain electrode and thereby eliminates the possibility of insulation breakdown.

Until now illustrated and described with respect to the preferred embodiment according to the present invention, but not limited to this can be variously changed and used by those skilled in the art.

However, it is apparent that such modifications fall within the scope of the present invention.

Claims (3)

An electrode of a plasma display panel comprising a rear substrate having a plurality of partition walls arranged in parallel and coated with a phosphor, and a front substrate having a transparent electrode and a bus electrode sealed against an upper side of the rear substrate and having a discharge electrode, The transparent electrode is a plasma display panel electrode, characterized in that the discharge prevention unit is integrally provided to prevent the discharge is generated locally at both ends of the outer portion of the effective screen. The electrode of claim 1, wherein the discharge preventing part has an inclined surface formed to be inclined toward the bus electrode side from the inside of the transparent electrode protruding from the outer surface of the partition wall disposed at the edge. The electrode of claim 2, wherein the inclined surface has a large radius of curvature.