KR100708664B1 - Plasma display panel - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention aims to provide a plasma display panel having a novel structure, and in order to achieve this object, the present invention provides a first substrate, a second substrate disposed in parallel with the first substrate, and the first substrate. A first partition wall disposed between a first substrate and a second substrate and defining discharge cells together with the first substrate and the second substrate, first discharge electrodes disposed on the discharge cells, and the discharge cells. Second discharge electrodes disposed, phosphor layers disposed in the discharge cells, and discharge gas in the discharge cells, wherein at least one discharge cell has the phosphor layer at least on the side surface of the first partition wall; Provided is a plasma display panel including a portion thereof.

Description

Plasma Display Panel {Plasma display panel}

1 is a partial cutaway perspective view showing a conventional plasma display panel;

2 is a partially cutaway perspective view of a plasma display panel according to a first embodiment of the present invention;

3 is a perspective view illustrating an arrangement of electrodes of the plasma display panel illustrated in FIG. 2;

4 is a cross-sectional view taken along line IV-IV of FIG. 2,

5 is a cross-sectional view of a plasma display panel according to a second embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

211: first substrate

212: first discharge electrode 213: second discharge electrode

215, 315: first partition 216: protective film

221: second substrate 222: address electrode

223: dielectric layer 224: second partition wall

225: phosphor layer 226: discharge cell

The present invention relates to a plasma display panel having a novel structure.

1 shows a plasma display panel similar to that disclosed in Japanese Laid-Open Patent Publication No. 1998-172442. The plasma display panel includes a second substrate 121, address electrodes 122 disposed in parallel with each other on the top surface 121a of the second substrate 121, a second dielectric layer 123 covering the address electrodes, Barrier ribs 124 formed on the second dielectric layer 123, a phosphor layer 125 formed on an upper surface of the second dielectric layer 123 and a side surface of the barrier rib 124, and a second material disposed in parallel with the second substrate. A first substrate 111, sustain electrode pairs 114 disposed on the bottom surface 111a of the first substrate, a first dielectric layer 115 covering the sustain electrode pairs, and a protective layer covering the first dielectric layer ( 116. The sustain electrode pair includes an X electrode 112 and a Y electrode 113, and each of the X electrode 112 and the Y electrode 113 includes transparent electrodes 112b and 113b and bus electrodes 112a and 113a. do.

In the case of the plasma display panel 110, one subpixel is defined by two partition walls 124 adjacent to one storage electrode pair 114. In the case of the plasma display panel having such a structure, a subpixel to emit light is selected by the address discharge between the address electrode 122 and the Y electrode 113, and the X electrode 112 and the Y electrode 113 of the selected subpixel are selected. The subpixels emit light due to the sustain discharge occurring between them. More specifically, the sustain discharge causes the discharge gas in the subpixel to emit ultraviolet light, which causes the phosphor layer 125 to emit visible light. Light emitted from the phosphor layer implements an image of the plasma display panel. There are various conditions for the luminous efficiency of the plasma display panel 110 to be high. Some of the conditions are that the volume of the space where the sustain discharge takes place to excite the discharge gas must be large, the surface area of the phosphor layer must be large, and there must be few components that obstruct the visible light emitted from the phosphor layer. Things.

However, in the case of the plasma display panel 110 having the above structure, since the sustain discharge occurs only in the space between the X electrode 112 and the Y electrode 113 adjacent to the protective film 116, the volume of the space where the sustain discharge occurs. This small, surface area of the phosphor layer is not particularly large, and part of the visible light emitted from the phosphor layer 125 is formed by the protective film 116, the first dielectric layer 115, the transparent electrodes 112b and 113b, and the bus electrode 112a. , 113a) and the like, there is a problem that the amount of visible light passing through the first substrate is only about 60% of the amount of visible light emitted from the phosphor layer.

An object of the present invention is to solve the above problems, to provide a plasma display panel with improved luminous efficiency.

Another object of the present invention is to provide a plasma display panel with improved brightness.

In order to achieve the above objects and other objects, the present invention is disposed between the first substrate, the second substrate disposed in parallel to the first substrate, the first substrate and the second substrate, A first partition wall defining a discharge cell together with a first substrate and a second substrate, first discharge electrodes disposed in the discharge cells, second discharge electrodes disposed in the discharge cells, and the discharge cell Phosphor layers disposed in the light emitting diodes and a discharge gas in the discharge cells, wherein the at least one discharge cell includes at least a portion of the side surface of the first partition wall. Provide a panel.

In the present invention, red, green, and blue light emitting phosphor layers are respectively disposed in the discharge cells, and in the discharge cells in which the phosphor layer having the lowest luminous efficiency among the red, green and blue light emitting phosphor layers is disposed, Preferably, the phosphor layer includes at least a portion of the side surface of the first partition wall.

Further, in the present invention, the discharge cells are provided with red, green, and blue light emitting phosphor layers, respectively, and in the discharge cells in which the blue light emitting phosphor layer is disposed, the blue light emitting phosphor layer is formed at least on the side of the first partition wall. It is preferred to include a portion.

Next, the first embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4. The plasma display panel according to the first embodiment includes a first substrate 211, a second substrate 221, a first partition 215, a first discharge electrode 212, a second discharge electrode 213, and a second substrate. The partition 224, the phosphor layer 225, and a discharge gas are provided.

The second substrate 221 is disposed parallel to the first substrate 211, and the first substrate 211 and the second substrate 221 are made of a transparent material such as glass. A portion of the lower surface 211a of the first substrate that defines the discharge cell 226 includes a sustain electrode pair 114 on the lower surface of the first substrate of the conventional plasma display panel and a first dielectric layer covering the sustain electrode pair. There is no 115 or the like, and therefore, 80% or more of the amount of visible light emitted from the phosphor layer 225 to be described later can pass through the first substrate 211.

A first partition 215 formed of a dielectric material on the lower surface 211a of the first substrate 211 defines red, green, and blue discharge cells 226 together with the first substrate 211 and the second substrate 221. ) Is formed. In FIG. 2, the discharge cells 226 are illustrated in a matrix form, but are not limited thereto and may be arranged in a delta form. In addition, although the cross-section of the discharge cell 226 is illustrated in FIG. 2 as being rectangular, the present invention is not limited thereto and may be a polygon such as a triangle or a pentagon, or a circle or an ellipse.

The first partition 215 may be configured to directly protect the adjacent second discharge electrode 213 and the first discharge electrode 212 during sustain discharge and to damage the charged particles by colliding with the discharge electrodes 212 and 213. It is formed as a dielectric which can be prevented. Such dielectrics include PbO, B ₂ O ₃ , SiO _2, and the like.

In the first partition 215, the first discharge electrode 212 and the second discharge electrode 213 surrounding the discharge cell 226 may be disposed to be spaced apart from each other. The first discharge electrode 212 and the second discharge electrode 213 are electrodes for sustain discharge, and a sustain discharge occurs to implement an image of the plasma display panel between the electrodes. The first discharge electrode 212 and the second discharge electrode 213 may be formed of a conductive metal such as aluminum or copper, and the address electrode 222 described later may also be formed of a conductive metal.

In the case of the plasma display panel according to the present embodiment illustrated in FIG. 2, the first discharge electrode 212, the second discharge electrode 213, and the address electrode 222 are arranged as shown in FIG. 3, The first discharge electrode 212 and the second discharge electrode 213 have a ladder shape. The second discharge electrode 213 and the first discharge electrode 212 are formed in pairs to extend in parallel to each other in one direction, and the address electrode 222 extends to cross the direction in which they extend. In this electrode arrangement structure, address discharge occurs between one electrode of the first discharge electrode 212 and the second discharge electrode 213 and the address electrode 222, and the first discharge electrode 212 and the second discharge electrode 213 are formed. This is to allow the sustain discharge to occur.

In one discharge cell of the plasma display panel driven by the address discharge and the sustain discharge, two discharge electrodes (one discharge electrode pair) and one address electrode 222, which are commonly referred to as X electrodes and Y electrodes, are disposed. The address discharge is a discharge occurring between the Y electrode and the address electrode 222, and as in the case of the present embodiment, when the address electrode 222 is disposed below the first discharge electrode 212 and the second discharge electrode 213. The first discharge electrode 212 is preferably the Y electrode. When the first discharge electrode 212 is the Y electrode, the second discharge electrode 213 becomes the X electrode.

Unlike the conventional sustain discharge electrodes 112 and 113, the first discharge electrode 212 and the second discharge electrode 213 of the present embodiment surround the discharge cell 226. Since it occurs along the circumference, the volume of the space in which the sustain discharge occurs is relatively large. For this reason, the luminous efficiency of the plasma display panel according to the present embodiment is higher than that of the conventional plasma display panel.

In addition, in the discharge cell 226 of the plasma display panel according to the present embodiment, as shown in FIG. 4, the sustain discharge is performed only at the upper side (the portion close to the first substrate) of the discharge cell 226. Ion sputtering of the phosphor by the charged particles that may be generated at the time of discharge is reduced, and thus there is an advantage that the generation of permanent afterimage due to deterioration of the phosphor layer 225 is reduced.

2 to 4 illustrate that the address electrodes 222 are disposed on the upper surface 221a of the second substrate, the location of the address electrodes 222 is not limited thereto. For example, the address electrode 222 may be disposed to surround the discharge cell 226 in the first partition 215. In this case, the address electrode 222 has a similar shape (ladder shape) to the above-described second discharge electrode 213 and the first discharge electrode 212, but the second discharge electrode 213 and the first discharge electrode 212. ) Is different in that it extends in a direction intersecting with the extending direction. In this case, the address electrode 222 may be disposed between the second discharge electrode 213 and the first substrate 211, between the second discharge electrode 213 and the first discharge electrode 212, or between the first discharge electrode and the first discharge electrode. One partition 224 may be disposed between. Wherever the address electrode is disposed, it is spaced apart from and insulated from the second discharge electrode 213 and the first discharge electrode 212. The address electrode 222 may be disposed on a portion defining a discharge cell of the lower surface 211a of the first substrate. In this case, the address electrode should be covered by a separate dielectric layer.

The dielectric layer 223 is disposed to cover the address electrode 222, which prevents the charged particles from colliding with the address electrode 222 and damaging the address electrode 222 during discharge. The dielectric layer 223 should be formed as a dielectric capable of inducing charged particles. Such dielectrics include PbO, B ₂ O ₃ , SiO _2, and the like.

The second partition 224 may be disposed below the first partition 215, more specifically, between the first partition 215 and the dielectric layer 223. In addition, similar to the first partition 215, the second partition 224 also has a lattice shape for arranging a space having a rectangular cross section in a matrix form.

One of red, green, or blue light emitting phosphors is disposed in the discharge cell 226. That is, a red light emitting phosphor layer 225R is disposed in the red discharge cell 226R, a green light emitting phosphor layer 225G is disposed in the green discharge cell 226G, and a blue light emitting phosphor is disposed in the blue discharge cell 226B. Layer 225B is disposed. The red, green, and blue light emitting phosphor layers 225R, 225G, and 225B may be disposed to include the side surface 215a of the first partition wall and the side surface 224a of the second partition wall. In addition, the red, green, and blue light emitting phosphor layers 225R, 225G, and 225B may be disposed on the front surface 223a of the dielectric layer between the second partition walls. This is for maximizing the coating area of the phosphor layer and increasing the amount of visible light, thereby increasing the brightness. However, the phosphor layers need not entirely cover the side surface 215a of the first partition wall or the side surface 224a of the second partition wall, and may be applied within a range for satisfying the required luminance.

The phosphor layers 225 are formed by applying a phosphor paste in which one phosphor, a solvent, and a binder in a red light emitting phosphor, a green light emitting phosphor, and a blue light emitting phosphor are mixed, followed by a drying and firing process. Examples of the red light emitting phosphor include Y (V, P) O 4: Eu, and examples of the green light emitting phosphor include Zn ₂ SiO ₄ : Mn, YBO ₃ : Tb, and the blue light emitting phosphor includes BAM: Eu.

As shown in FIG. 3, the protective layer 216 is preferably covered on at least the phosphor layers 225a disposed on the side surfaces 215a of the first partition wall. The protective film 216 is formed by, for example, MgO deposition. When the protective film 216 is deposited, a lower surface 215c (see FIG. 4) of the first partition wall and a first substrate defining a discharge cell 226 may be formed. The passivation layer 216 may also be formed on the lower surface 211a. However, the protective film 216 formed on the lower surface 215c of the first partition wall and the lower surface 211a of the first substrate does not adversely affect the operation of the plasma display panel according to the present embodiment. The passivation layer 216 formed in FIG. 1 may be preferable in view of secondary electron emission effects.

The discharge gas is filled in the discharge cell 226. The discharge gas is, for example, a Ne-Xe mixed gas containing 5% to 15% of Xe, and at least a part of Ne may be replaced with He as necessary.

There are various methods of manufacturing the plasma display panel 200 having the above structure. One method is to prepare the upper and lower plates separately and then combine them. First, a method of manufacturing the top plate will be briefly described. First barrier ribs 215 and first and second discharge electrodes 212 and 213 are formed on the first substrate 211. Thereafter, the phosphor paste is applied to the side surface 215a of the first partition wall, and dried and baked to form the phosphor layer 225a. After the phosphor layer is formed, the protective film 216 is formed using a vapor deposition method or the like. In addition, referring to the method of manufacturing the lower plate, first, the address electrodes 222 are formed on the second substrate 221, and the dielectric layer 223 is formed to cover the address electrodes. Thereafter, the second partition wall 224 is formed on the dielectric layer. Thereafter, a phosphor paste is coated on the dielectric layer between the sidewalls 224a of the second partition wall and the second partition walls by a printing method to form the phosphor layer 225b, thereby completing the lower plate.

Another method of manufacturing the plasma display panel 200 is as follows. First, address electrodes 2220 are formed on the second substrate 221, and a dielectric layer 223 is formed to cover the address electrodes, and then a second partition wall 224 is formed on the dielectric layer. The first barrier rib 215 and the first and second discharge electrodes 212 and 213 are formed on the second barrier rib, and when the process is finished, the first barrier rib 215a and the second barrier rib 224a are formed. And a phosphor paste on the dielectric layers between the second partition walls by a printing method to form the phosphor layer 225. After the phosphor layer is formed, the protective film 216 is formed using a vapor deposition method or the like. The first substrate 211 is coupled to face the second substrate 221.

The operation of the plasma display panel having the above configuration will be briefly described. The address discharge is caused by the application of the address voltage Va between the address electrode 222 and the first discharge electrode 212, and the discharge cell 226 in which the sustain discharge occurs is selected as a result of the address discharge. The discharge cell 226 in which the sustain discharge is to be selected is selected from the second discharge electrode 213 of the first partition 215 (when the first partition 215 is covered by the protective film 216). ) And wall charges are accumulated in a region adjacent to the first discharge electrode 212 so that sustain discharge can occur. When the address discharge is completed, cations are accumulated in the region adjacent to the first discharge electrode 212 and electrons are accumulated in the region adjacent to the second discharge electrode 213.

After the address discharge, when the sustain discharge voltage Vs is applied between the first discharge electrode 212 and the second discharge electrode 213 of the selected discharge cell, positive ions accumulated in the region adjacent to the first discharge electrode 212. And electrons accumulated in an area adjacent to the second discharge electrode 213 collide with each other to cause a sustain discharge. As the sustain discharge progresses, the discharge sustain voltage Vs is alternately applied between the first discharge electrode 212 and the second discharge electrode 213.

The energy discharge of the discharge gas is increased by the sustain discharge, and the ultraviolet rays are emitted from the discharge gas while the elevated energy level of the discharge gas is lowered. The ultraviolet ray raises the energy level of the phosphor contained in the phosphor layer 225 disposed in the discharge cell 226, and the visible energy is emitted while the raised energy level of the phosphor is lowered. An image is implemented on the panel in the plasma display by the visible light emitted from the respective discharge cells 226.

Modifications of the first embodiment will be described. When the plasma display panel is driven by two electrodes, that is, the second discharge electrode 213 and the first discharge electrode 212, and there is no address electrode 222, unlike the case shown in FIG. The second discharge electrode 213 extends in one direction, and the first discharge electrode 212 extends to intersect the second discharge electrode 213. Since there is no address electrode 222, the dielectric layer 223 is not necessary.

Hereinafter, with reference to FIG. 5, a plasma display panel according to a second embodiment of the present invention will be described, focusing on different matters from the first embodiment. The present embodiment differs from the first embodiment in the arrangement positions of the red, green, and blue light emitting phosphor layers 325R, 325G, and 325B according to the red, green, and blue discharge cells 226R, 226G, and 226B.

In general, the blue light emitting phosphor layer 325B has a lower luminous efficiency than the red or green light emitting phosphor layers 325R and 325G due to material properties. Therefore, when the same voltage is applied to each discharge cell, the brightness of the blue discharge cell is the lowest. This causes the color temperature of the plasma display panel to decrease. However, in the present embodiment, the coating area of the blue light emitting phosphor layer 325B is wider than that of the red or green light emitting phosphor layers 325R and 325G. In more detail, the blue light emitting phosphor layer 325B in the blue discharge cell 226B is disposed on the dielectric layer 223 between the sidewalls 215a of the first barrier rib and the sidewall 224a of the second barrier rib and the second barrier ribs. On the other hand, in the red or green discharge cells 226R and 226G, the green or red light emitting phosphor layers 325R and 325G are only on the dielectric layer 223 between the sidewall 224a of the second partition wall and the second partition wall. It is applied. Therefore, even if the size of the discharge cells is the same, the coating area of the blue light emitting phosphor layer is increased, so that the luminance of the blue discharge cells can be the same as that of the green or red discharge cells, so that the color temperature is improved as a whole.

However, in the present embodiment, the blue light emitting phosphor layer is based on the assumption that the light emitting efficiency is lower than that of the green light emitting phosphor layer and the red light emitting phosphor layer, but if the green light emitting phosphor layer or the red light emitting phosphor layer emits light than other phosphor layers, When the efficiency is low, it is preferable that the phosphor layer having the lowest luminous efficiency has the largest application area. In addition, the coating area of the phosphor layer may be increased in the order of low luminous efficiency of the phosphor layer. At this time, it is preferable to determine the coating area so that the luminance in each discharge cell is substantially the same.

In addition, the matters not separately described with respect to the second embodiment are the same as the matters concerning the first embodiment.

The plasma display panel according to the present invention has the following effects.

First, since the coating area of the phosphor layer in the discharge cell increases, the luminance is improved. In addition, when the coating area of the phosphor layer having low luminous efficiency is increased, the luminance of the discharge cells becomes uniform, thereby improving the color temperature.

Second, the visible light emitted from the discharge cell passes through the first substrate, and since the electrodes do not exist in the portion of the first substrate through which the visible light passes, the aperture ratio can be significantly improved, and the transmittance is improved.

Third, since the surface discharge can be generated in all aspects forming the discharge space, the discharge surface can be greatly enlarged.

Fourth, since the discharge is generated in terms of forming the discharge cell and diffused to the center portion of the discharge cell, the discharge area is remarkably improved compared with the conventional one, so that the entire discharge cell can be efficiently used. Therefore, it is possible to drive even at a low voltage can significantly improve the luminous efficiency.

Fifth, since low voltage driving is possible, even when a high concentration of Xe gas is used as the discharge gas, low voltage driving is possible, thereby improving luminous efficiency.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (14)

A first substrate; A second substrate arranged in parallel with the first substrate; A first partition wall disposed between the first substrate and the second substrate and defining discharge cells together with the first substrate and the second substrate; First discharge electrodes and second discharge electrodes disposed in the discharge cells and extending to surround the discharge cells; Phosphor layers disposed in the discharge cells; And A discharge gas in the discharge cells; And at least one discharge cell, wherein the phosphor layer includes at least a portion of a side surface of the first partition wall. The method of claim 1, Red, green, and blue light emitting phosphor layers are disposed in the discharge cells, respectively. Wherein, in the discharge cells in which the phosphor layer having the lowest luminous efficiency is disposed among the red, green, and blue light emitting phosphor layers, the phosphor layer includes at least a portion of a side surface of the first partition wall. panel. The method of claim 1, Red, green, and blue light emitting phosphor layers are disposed in the discharge cells, respectively. And the blue light emitting phosphor layer includes at least a portion of a side surface of the first partition wall in the discharge cells in which the blue light emitting phosphor layer is disposed. The method of claim 1, And the phosphor layers disposed on the side surfaces of the first partition wall are symmetrically disposed. delete The method of claim 1, And the first discharge electrodes and the second discharge electrodes have a ladder shape. The method of claim 1, And the first discharge electrodes and the second discharge electrodes are disposed in the first partition wall. The method of claim 1, And a protective layer disposed adjacent to at least a side of the first partition wall. The method of claim 1, And the first discharge electrodes extend in one direction, and the second discharge electrodes in the discharge cell extend to cross the direction in which the first discharge electrodes extend. The method of claim 1, The first discharge electrodes and the second discharge electrodes extend in one direction, And at least one address electrode extending in the discharge cell to cross the direction in which the first discharge electrode and the second discharge electrode extend. The method of claim 10, And a dielectric layer covering the address electrode. The method of claim 10, And the address electrodes are disposed on the second substrate facing the discharge cells. The method of claim 1, And a second partition wall disposed between the first partition wall and the second substrate. The method of claim 13, And a phosphor layer disposed on at least a side of the second partition wall.

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