KR100669462B1 - Plasma display panel - Google Patents

Abstract

The PDP of the present invention includes a front substrate and a rear substrate which are disposed to face each other, partition walls arranged in a space between the front substrate and the rear substrate to partition a plurality of discharge cells, and a phosphor layer formed in each of the discharge cells. The front substrate includes address electrodes corresponding to the plurality of discharge cells and a display electrode extending in a direction crossing the address electrodes, wherein the back substrate is formed of metal matrix composites (MMCs). Is formed.

Plasma, Display, MMCs, Metal Composites, Heat Dissipation

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is a schematic partial exploded perspective view of a plasma display panel constructed in accordance with an embodiment of the present invention.

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

3 is a plan view illustrating an arrangement relationship between a partition, a display electrode, and an address electrode.

The present invention relates to a plasma display panel (PDP) that improves heat dissipation efficiency while displaying an image with low power consumption.

In general, PDP is a display device that implements an image by using red (R), green (G), blue (B) visible light generated by the ultraviolet radiation emitted from the plasma obtained through the gas discharge to excite the phosphor. The PDP can realize an ultra-large screen of 60 inches or more within a thickness of only 10 cm, and is a self-luminous display device such as a CRT, which has no characteristic of distortion due to color reproduction and viewing angle, and also has a simple manufacturing method compared to LCD. It is gaining popularity as a TV and industrial flat panel display that has strengths in productivity and cost.

In a typical AC PDP, address electrodes are formed in one direction over a rear substrate, and a dielectric layer is formed over the entire surface of the rear substrate while covering the address electrodes. On the dielectric layer, barrier ribs are formed between the address electrodes, and phosphor layers of red (R), green (G), and blue (B) colors are formed between the barrier ribs.

In addition, a pair of discharge electrodes are formed on one surface of the front substrate opposite to the rear substrate along a direction crossing the address electrodes, and a dielectric layer and a passivation layer are sequentially formed on the entire front substrate while covering the discharge electrodes.

In the PDP having such a structure, a space defined by the partition wall forms a discharge cell at a point where the address electrodes of the rear substrate and the discharge electrodes of the front substrate cross each other.

In the PDP configured as described above, millions of unit discharge cells are arranged in a matrix form. In order to simultaneously drive the discharge cells of the PDP arranged in a matrix form, the driving using the memory characteristic is performed.

In more detail, in order to generate a discharge between the first electrode and the second electrode constituting the pair of discharge electrodes, a potential difference of a specific voltage or more is required, and the voltage at this boundary is called a firing voltage (Vf). do. At this time, when the address voltage is applied between the second electrode and the address electrode, the discharge is started to form a plasma in the discharge cell, and the electrons and ions in the plasma move to the electrode having the opposite polarity, so that a current flows.

On the other hand, since the address electrode and the discharge electrode are coated with a dielectric layer, most of the space charges transferred are stacked on the dielectric layer having the opposite polarity, so that the net space potential between the second electrode and the address electrode is originally applied to the address voltage. It becomes smaller than Va, the discharge is weakened, and the address discharge is extinguished. The charges accumulated on the dielectric layers covering the first electrode and the second electrode are called wall charges (Qw), and the space voltages formed between the first and second electrodes by the wall charges are wall voltages (Vw: Wall). Voltage).

Subsequently, when a constant voltage (Vs: discharge holding voltage) is applied between the first electrode and the second electrode, the value (Vs + Vw) of the sum of the discharge holding voltage Vs and the wall voltage Vw is discharged. When the voltage is higher than the starting voltage Vf, discharge occurs in the discharge cell, and the generated ultraviolet rays excite the phosphor to emit visible light through the transparent front substrate.

The PDP driven in this way goes through several steps from the input power source to the visible light, and the energy conversion efficiency in each process is not good. As a result, the efficiency (ratio of luminance to power consumption) indicated by the current PDP is CRT. Compared to the lower level. In other words, PDP has a problem of excessive power consumption, such as using a high voltage.

On the other hand, the PDP driving as described above is driven at a high voltage, while the energy conversion efficiency is very low, most of the energy is discharged in the form of heat. Therefore, since the PDP generates high heat during the driving process, the heat dissipation problem is one of the important issues in addition to the power consumption described above. On the other hand, the front and back substrates surrounding the discharge cells are made of tempered glass, which has physical properties with very low thermal conductivity. Therefore, when the PDP is coupled to the chassis base, a thermally conductive member is provided therebetween.

However, this heat conducting member is a very expensive product, and since the tempered glass used as the front substrate and the back substrate is also very difficult to require the physical properties required to be manufactured through many pre-treatment steps, the cost is very high. As these points are reflected in the price of PDP, there is a problem of lowering the price competitiveness of PDP.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides the present invention for reducing power consumption by enabling address discharge at low voltage.

Another object of the present invention is to improve the structure of the plasma display panel and to provide the present invention to effectively diffuse and remove the high heat from the driving process.

In order to achieve the above object, the plasma display panel provided in one embodiment of the present invention,

A front substrate and a rear substrate disposed to face each other, partition walls arranged in a space between the front substrate and the rear substrate to partition a plurality of discharge cells, and a phosphor layer formed in each of the discharge cells. Address electrodes and display electrodes extending in a direction crossing the address electrodes correspond to the plurality of discharge cells, and the back substrate is formed of metal matrix composites (MMCs).

In the present invention, it is preferable that the back substrate is formed of a metal composite material having a base metal of aluminum (Al), and the back substrate may further include a dielectric layer forming an interface between the partition wall and the back substrate.

The present invention may further include a first dielectric layer covering the display electrode and a second dielectric layer covering the address electrode.

In the present invention, the address electrodes may be elongated in a direction crossing the display electrode, and may include branches extending inwardly of the discharge cell.

In the present invention, the display electrode may be formed as a pair of sustain electrodes and scan electrodes, and the branch may extend between opposing spaces of the sustain electrodes and the scan electrodes. In this case, the address electrode may be formed thereon along a partition wall extending in a direction crossing the display electrode.

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 can 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 partially exploded perspective view illustrating a plasma display panel (hereinafter, referred to as 'PDP') constructed according to an embodiment of the present invention.

Referring to this figure, the PDP of this embodiment is formed by sealing the front substrate 1 and the rear substrate 3 face to face with each other, and filling an inert gas between the front substrate and the back substrates 1 and 3. The red (R), green (G), and blue (B) applied to the plurality of discharge cells (7R, 7G, 7B) partitioned by the partition walls (5) disposed between the front and rear substrates (1, 3). Phosphor layers 9R, 9G, and 9B are formed of a colored phosphor.

The front substrate 1 is formed of tempered glass having good durability while transmitting light well so as not to obscure the light emitted from the plurality of discharge cells 7R, 7G, and 7B. The plurality of display electrodes 16 extend along one direction (y-axis direction of the drawing) by stacking on the front substrate 1, and the display electrodes 16 are formed while the neighboring ones are formed at a predetermined interval. Each of the display electrodes 16 is formed to correspond to each of the discharge cells 7R, 7G, and 7B. These display electrodes 16 are constituted of sustain electrodes 13 and scan electrodes 15 in their functional operation. The scan electrode 13 selects a discharge cell that is turned on by working with the address electrode 11 to be described later, and the sustain electrode 15 works with the scan electrode 13 to generate sustain discharge for the selected discharge cell.

In addition, address electrodes 11 are formed on the front substrate 1 in a direction intersecting the display electrodes 16 (the x-axis direction in the drawing), and the address electrodes 11 face the partition walls 5. The barrier ribs 5 are elongated in the extending direction of the barrier ribs 5, and the address electrodes 11 are arranged at intervals corresponding to the discharge cells 7R, 7G, and 7B along the x axis direction.

The address electrodes 11 have a constant width in the x-axis direction, and the one end of the width reaches the center of the partition wall 5 which is shared with the discharge cells 7R, 7G, and 7B as close as possible. Since the tip of one side of the address electrode 11 does not exceed the center of the partition 5, erroneous discharges in other adjacent discharge cells 7R, 7G, and 7B are prevented (see Fig. 3).

The display electrode 16 and the address electrode 11 formed as described above are sequentially covered by the first and second dielectric layers 17 and 19 formed of a dielectric such as PbO, B ₂ O ₃ , and SiO ₂ . This dielectric layer prevents the charged particles from directly colliding with the display electrode 16 and the address electrodes 11 during discharge, thereby damaging the display electrode 16 and the address electrode 11, and inducing charged particles. do. In addition, since the first and second dielectric layers 17 and 19 are separately coated with the display electrode 16 and the address electrode 11, the two electrodes 11 and 16 are electrically insulated from each other.

In addition, the second dielectric layer 19 may be covered by a protective film 21 formed of magnesium oxide (MgO) or the like, wherein the protective film 29 may include charged particles when discharged from the first and second dielectric layers 17. , 19) to prevent damage to the dielectric layers 17 and 19, and when charged particles collide with each other, the secondary electrons may be discharged to increase discharge efficiency.

In the present embodiment, the back substrate 3 is formed of metal matrix composites (MMCs). This metal composite material is a composition in which fibers, whiskers, and particles, which are ceramic reinforcements having high thermal stability and high modulus, are reinforced with matrix materials having ductility and toughness. Preferably, the metal composite material used in the present embodiment uses that the base metal is aluminum (Al). Since the aluminum itself has excellent thermal conductivity, the high heat generated during the operation of the PDP can be easily diffused to the outside and discharged. In addition, when the back substrate 3 is used as the metal composite material, there is an advantage that the overall thickness of the PDP can be made slimmer than before. That is, in general, when the substrate is made of tempered glass, the thickness should be maintained about 2.8 (mm) due to the structural strength and technical limitations.However, when the metal composite material is used, the thickness of the substrate may be about 1.5 (mm). have. In addition, since the metal composite material is relatively lighter than tempered glass, the weight of the PDP can be reduced, and furthermore, since the high heat is diffused and removed by the rear substrate 3 itself, there is no need to install an expensive heat conducting member. There is an advantage.

When laminated on the back substrate 3, the dielectric layer 4 is formed on the whole, and the partition 5 is formed in a predetermined pattern thereon. The dielectric layer 4 acts as an interface between the partition 5 and the back substrate 3 to further improve the adhesive force between the partition 5 and the back substrate 3. Of course, the partition wall 5 may be formed by directly stacking the rear substrate 3 without using the dielectric layer 4.

The partition wall 5 divides the discharge cells 7R, 7G, and 7B, which are discharge spaces in which discharge is performed, to prevent cross talk between adjacent discharge cells. As shown in the figure, the barrier ribs 5 are elongated in the direction intersecting the display electrodes (the y-axis direction in the drawing), and are formed in a stripe shape spaced apart from each other while maintaining a predetermined distance from the neighboring ones. However, in the present embodiment, such a partition structure is described as a preferable form, so that a partition structure of various shapes is also possible.

In the discharge cells 7R, 7G, and 7B, phosphor layers 9R, 9G, and 9B, which emit visible light by being excited by ultraviolet rays generated during discharge, are formed. The phosphor layers 9R, 9G, and 9B are formed over the wall surface of the partition wall 5 and the lower surface of the dielectric layer 4 defined by the partition wall 5 as shown. As described above, a discharge gas in which neon (Ne), xenon (Xe), and the like are mixed is filled in the discharge cells in which the phosphor layers 9R, 9G, and 9B are disposed.

Hereinafter, the laminated structure of the PDP of this embodiment having such a configuration will be described. FIG. 2 is a partial cross-sectional view taken along the line A-A of FIG. 1, and FIG. 3 is a partial plan view of FIG. Referring to these drawings, the stacked structure of the display electrode 16 and the address electrode 11 formed of the front substrate 1 will be described.

The address electrodes 11 are arranged closer to the discharge cells 7R, 7G, and 7B than the display electrodes 16 while forming a stacked structure in an insulated state from the display electrodes 16. That is, the front substrate 1 has a stacked structure in which the display electrodes 16 are first provided, and the address electrodes 11 are provided insulated on the display electrodes 16.

The display electrode 16 is composed of transparent electrodes 13a and 15a protruding toward the center of the discharge cells 7R, 7G and 7B and bus electrodes 13b and 15b for supplying current thereto. Although not shown, the display electrode 16 may be formed of only the transparent electrodes 13a and 15a or the bus electrodes 13b and 15b.

Here, the transparent electrodes 13a and 15a play a role of causing plasma surface discharge inside the discharge cells 7R, 7G, and 7B, and it is preferable to use a transparent indium tin oxide (ITO) electrode to secure luminance. The bus electrodes 13b and 15b preferably use metal electrodes to compensate for the high resistance of the transparent electrodes 13a and 15a to ensure current conduction.

The display electrodes 16 are arranged in pairs in the discharge cells 7R, 7G, and 7B so as to face each other, so that the pair of bus electrodes 13b, corresponding to each of the discharge cells 7R, 7G, and 7B are formed. 15b are formed in parallel with each other in a straight line, and the transparent electrodes 13a and 15a protrude inwards toward the center of each discharge cell 7R, 7G, and 7B from the bus electrodes 13b and 15b, thereby addressing the electrode 11. Are opposed to each other in the elongation direction, i.e., the y axis direction. The display electrodes 16 are covered with the first dielectric layer 17.

The address electrodes 11 are provided on the first dielectric layer 17 in the discharge cells 7R, 7G, and 7B and are covered with the second dielectric layer 19. The first and second dielectric layers 17 and 19 may be formed of a transparent material to ensure transmittance of visible light, and may be formed of the same kind of dielectric so that light is not distorted due to the difference in dielectric constant.

With this stacked structure, the address electrode 11 is provided on the front substrate 1 while maintaining the distance close to the scan electrode 15, that is, the address discharge gap g. In this case, power consumption required for address discharge can be reduced, thereby reducing power consumption of the PDP.

The address electrodes 11 are formed in a stripe shape on the first dielectric layer 17 of the front substrate 1 along a position corresponding to the partition wall 5, from which the centers of the discharge cells 7R, 7G, and 7B are formed. It further has a branch 11a extending toward it.

The branch 11a is for further reducing the address discharge voltage, and is preferably formed to extend closer to the scan electrode 15 while being formed toward the center of the discharge cells 7R, 7G, and 7B. In more detail, the branch 11a is preferably elongated between the sustain electrodes and the transparent electrodes 13a and 15a of the scan electrodes 13 and 15, that is, adjacent to the transparent electrode 15a of the scan electrode 15. Do. In FIG. 3, the branch 11a extends toward the centers of the sustain and scan electrodes 13 and 15 facing each other.

This branch 11a is connected to the scanning electrode 15 side of the corresponding discharge cells 7R, 7G, and 7B, that is, the transparent electrode 15a and the same without causing erroneous discharge in other adjacent discharge cells 7R, 7G, and 7B. In order to increase the range of opposing, it is preferable to extend to a length of 1/2 or more of the inner distance Lb of each discharge cell 7R, 7G, 7B. As the range in which the branch 11a and the transparent electrode 15a oppose each other increases, an effective address discharge can occur between the address electrode 11 and the scan electrode 15.

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 the scope of the invention.

As described above, according to the plasma display panel according to the present invention, the display substrate and the address electrode are provided as the front substrate, thereby reducing the discharge start voltage by minimizing the gap therebetween. As such, since the address electrode is disposed on the front substrate, the back substrate can be manufactured using a metal composite material instead of the tempered glass, and due to its physical properties, high heat can be easily diffused and removed without using a heat conductive member. In addition, by using the back substrate as a metal composite material, it is possible to achieve ultra-light weight and ultra-thin.

Claims (8)

A front substrate and a rear substrate disposed to face each other; Barrier ribs disposed in a space between the front substrate and the rear substrate to partition a plurality of discharge cells; And, A phosphor layer formed in each of the discharge cells, An address electrode and a display electrode extending in a direction crossing the address electrodes to correspond to the plurality of discharge cells; And the back substrate is formed of metal matrix composites (MMCs) using metal as a base material. The method of claim 1, And the back substrate is formed of a metal composite material having a base metal of aluminum (Al). The method of claim 1, And a dielectric layer forming an interface between the barrier rib and the rear substrate as the rear substrate. The method according to any one of claims 1 to 3, And a display electrode and an address electrode sequentially stacked on the front substrate. The method according to any one of claims 1 to 3, And a second dielectric layer covering the display electrode and a second dielectric layer covering the address electrode. The method according to any one of claims 1 to 3, The address electrodes are formed to extend in a direction crossing the display electrode; And a branch extending into the discharge cell. The method of claim 6, The display electrode is formed of a pair of sustain electrodes and scan electrodes, And the branch extends between the space between the sustain electrode and the scan electrode. The method of claim 6, And a plasma display panel formed thereon along a partition wall formed to extend in the direction crossing the display electrode.

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