KR100692814B1 - Plasma Display Panel - Google Patents

Abstract

The present invention relates to improving the efficiency by changing the top plate structure of the plasma display panel.

The plasma display panel of the present invention includes a transparent substrate, a first electrode and a second electrode formed on a substrate in parallel with each other, and a dielectric layer formed on a substrate including the first electrode and the second electrode and having a recessed discharge space. do.

In the present invention, low voltage driving is possible by using the electric field concentration between the discharge sustain electrodes, and the area of the passivation layer is increased, thereby maximizing the emission of secondary electrons, thereby increasing luminance and efficiency.

Description

Plasma Display Panel             

1A and 1B are plan views illustrating a top plate and a bottom plate structure of a conventional AC PDP.

2 is a cross-sectional view showing the structure of a conventional PDP.

3 is a cross-sectional view showing a top plate of a conventional PDP.

4 is a cross-sectional view showing a PDP upper plate structure according to an embodiment of the present invention.

5A to 5D are cross-sectional views illustrating a method of manufacturing a PDP plate according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

   2,20: upper glass substrate 4: bus electrode

   6,22: sustain electrode 24,8: dielectric

   10,26: protective film 12: phosphor

   14 bulkhead 16 address electrode

   18: lower glass substrate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alternating current plasma display panel (hereinafter referred to as "PDP"), and more particularly to a PDP capable of increasing luminous efficiency by changing the surface discharge structure of the PDP.

The plasma display panel (hereinafter referred to as "PDP") emits phosphors by 147 nm ultraviolet rays generated upon discharge of He + Xe or Ne + Xe gas, thereby displaying an image including characters or graphics. Such a PDP is not only thin and easy to enlarge, but also greatly improved in quality due to recent technology development. These PDPs are largely classified into a DC drive method and an AC drive method. Unlike the DC driving method, the PDP of the AC driving method is attracting more attention as a display device because of the advantages of low voltage driving and long life by using a dielectric.

1A to 1B show an upper plate and a lower plate of an AC PDP.

Referring to FIG. 1A, a top plate includes a sustain electrode pair 6 formed side by side on an upper glass substrate 2, a bus electrode pair 4 formed on each of the sustain electrode pair 6, and a bus electrode pair 4. ) And a dielectric layer 8 formed on the surface of the upper glass substrate 2, and a protective film 10 formed on the dielectric layer 8. The sustain electrode pair 6 is made of transparent metal material (ITO), and the surface discharge is continuously maintained during the sustain period. This sustain electrode pair 6 is generally formed on the upper glass substrate 2 by a screen printing method. The bus electrode pair 4 serves to reduce the electrical resistance of the sustain electrode pair 6. This bus electrode pair 4 is formed on each sustain electrode pair 6 by etching after Cr / Cu / Cr is deposited. The dielectric 8 accumulates electric charges generated at the time of discharge. This dielectric 8 is formed on the sustain electrode pair 6 and the upper glass substrate 2 by a screen printing method. The protective film 10 is formed on the dielectric 8 with MgO having a thickness of about 2000 GPa. The protective film 10 protects the dielectric material from the plasma generated in the discharge cell to increase the lifetime of the PDP, and also enables the use of a low voltage driving IC by emitting a lot of secondary electrons to reduce the discharge start voltage. It allows you to reduce the price.

As shown in FIG. 1B, the lower glass substrate 18 has an address electrode 16 formed on the lower glass substrate 18 so as to be orthogonal to the sustain electrode pair 6, and the address electrode 16 interposed therebetween. The partition 14 which extends perpendicularly from the surface, and the fluorescent substance 12R, 12G, 12B apply | coated to the partition 14 and the lower glass substrate 18 are provided. The address electrode 16 selects a discharge cell to be displayed by causing a counter discharge to occur together with the sustain electrode of one of the sustain electrode pairs 6 in the address period. This address electrode 16 is formed on the lower glass substrate 18 by a screen printing method. The partition wall 14 provides a discharge space of the discharge cells together with the upper and lower glass substrates 2 and 18 so that electrical and optical interference between the discharge cells is blocked. The partition 14 is formed to extend vertically from the lower glass substrate 18 by screen printing or sand blasting. Phosphors 12R, 12G, and 12B are excited by ultraviolet rays generated during discharge and then transition to generate visible light having an intrinsic color.

2 shows discharge cells in which these upper and lower plates are joined. When the upper plate and the lower plate are joined, the remaining air in the discharge space is exhausted therebetween, and then the inert mixed gas (He + Xe or Ne +) using the mixing ratio of Xe gas in the discharge cell space by about 4 to 7% through the inlet. Inject Xe) at a suitable pressure. And when the injection hole is sealed so that the discharge cell is airtight, the AC drive type PDP is completed.

In the PDP of the AC drive system, light emission causes an opposite discharge to occur in some of the discharge cells in the address period, and each of the discharge cells in which the opposite discharge has occurred performs surface discharge in the sustain period to display an image. In detail, when a voltage is applied to one sustain electrode of the sustain electrode pair 6 and a voltage is applied to the address electrode 16, a counter discharge between the sustain electrode 6 and the address electrode 16 is caused by the voltage difference. Get up. Ultraviolet rays generated by this address discharge excite and transition the phosphors 12R, 12G, and 12B. At this time, the phosphors 12R, 12G, and 12B generate visible light. The sustain electrode pair 6 causes surface discharge by sustain pulses supplied in the sustain period to maintain light emission of the phosphors 12R, 12G, and 12B.

Referring to FIG. 3, the surface discharge generated during the sustain period starts from the closest portion (the portion where the discharge radius is minimized) of the sustain electrode pair 6 and is far from the sustain discharge time (a portion having a large discharge radius). Expands to). At this time, the intensity of the electric field is the largest at the portion where the discharge radius is minimized. Accordingly, the density of electrons and ions is highest on the surface of the protective film 10, and in particular, most of electrons and ions having high temperature and energy are present in this portion. If the electron and ion density is high, the amount of ultraviolet rays applied to the phosphors 12R, 12G, and 12B increases, so that the luminance increases. On the other hand, if the electrons and ions have a low density, the amount of ultraviolet light decreases, so that the luminance is low.

However, in the conventional PDP, since the portion where the electric field is concentrated most is covered by the dielectric due to the structure of the sustain electrode, the relatively weak field is used as the discharge space. As described above, the conventional PDP has a problem of low discharge efficiency since the electric field concentration part and the electric discharge start part are separated.

Accordingly, an object of the present invention is to provide a high efficiency PDP by changing the top plate structure of the PDP.

In order to achieve the above object, the plasma display panel of the present invention includes a transparent substrate, a first electrode and a second electrode formed in parallel with each other on the substrate, and a dielectric layer formed on the substrate including the first electrode and the second electrode. And a predetermined discharge space is formed in the dielectric layer between the first electrode and the second electrode.
The discharge space is formed in a recessed portion formed on the substrate, and the dielectric recessed along the inclined surface of the recessed portion.
A protective film is further formed on the dielectric layer having the discharge space.
The first electrode and the second electrode are formed on the inclined surface of the recessed portion, characterized in that formed on the flat surface of the recessed portion.
The bus electrode is further formed on the first electrode and the second electrode, respectively.
Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

delete

Hereinafter, a preferred embodiment of the present invention will be described with reference to FIG. 4.

4 illustrates a top plate structure of a PDP according to an embodiment of the present invention. Referring to FIG. 4, the upper plate of the PDP includes a grooved upper glass substrate 20, a sustain electrode pair 22 formed on a flat surface and an inclined surface of the groove on the upper glass substrate 20, and a sustain electrode pair 22. A dielectric formed so as to have a groove portion between the bus electrode pairs 4 formed on each of the pairs, and the sustain electrode pairs 22 on the upper glass substrate 20 on which the sustain electrode pairs 22 and the bus electrode pairs 4 are formed. 24 and a protective film 26 applied over the dielectric 24.

The sustain electrode pair 22 is formed over the flat surface of the upper glass substrate 20 in which the grooves are formed and the inclined surface of the grooves so as to simultaneously achieve surface discharge and counter discharge. As a result, the opposite type of discharge is initiated by the inclined surface of the sustain electrode 22 to extend to the surface discharge by the flat surface of the sustain electrode pair 22. Dielectrics 24 that accumulate charge during discharge have grooves between the sustain electrode pairs 22, that is, the portions where the electric field is concentrated by the sustain electrode pairs 22, corresponding to the shape of the upper glass substrate 22. As a result, the discharge start voltage of the counter discharge can be lowered along with easy discharge cell selection and long life, which are advantages of the surface discharge structure. The bus electrode pair 4 serves to reduce the electrical resistance of the sustain electrode pair 22. The dielectric 24 accumulates electric charges generated during discharge. The protective film 26 serves to protect the dielectric when the PDP is discharged.

5A to 5D show step by step a method of manufacturing the PDP top plate of the present invention.

First, a groove is formed as shown in FIG. 5A by preparing an upper glass substrate 20 and then etching a desired portion using a wet etching or sand blasting method.

As shown in FIG. 5B, the sustain electrode pair 22 is formed over the flat surface and the inclined surface of the groove on the upper glass substrate 20 using the screen printing method, and the bus electrode pair 4 is formed on each sustain electrode pair ( 22) form on.

As shown in FIG. 5C, the dielectric 24 is formed on the sustain electrode pair 22 and the upper glass substrate 20 by a screen printing method. In this case, the dielectric 24 has grooves between the pair of sustain electrodes 22 corresponding to the shape of the upper glass substrate 20.

As shown in FIG. 5D, the protective film 26 is formed on the dielectric 24 with MgO to complete the PDP top plate.

 As described above, since the PDP according to the present invention uses the concentrated portion of the electric field as the discharge space, the discharge start voltage can be greatly reduced, and the discharge efficiency can be increased by taking the electrode width wider than before.

In addition, in the PDP according to the present invention, the groove slope of the upper glass substrate 20 is gently formed to maximize the surface area of the passivation layer 26, thereby maximizing the emission amount of secondary electrons at the same pixel size.

As described above, the PDP according to the present invention can be driven at a low voltage by using the electric field concentration between the discharge sustain electrodes as the discharge space, and the area of the passivation layer is increased to maximize the emission of the secondary electrons and thus the luminance. And there is an advantage to increase the efficiency.                     

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (5)

Board; A first electrode and a second electrode formed parallel to each other on the substrate; Recesses formed by recessing the substrate between the first electrode and the second electrode; And A dielectric layer formed on the substrate including the first electrode, the second electrode, and the recess; And a discharge space formed by recessing the dielectric in accordance with a shape of a recess formed on the substrate. delete The method of claim 1, And a protective film is formed on the dielectric layer having the discharge space. The method of claim 1, And the first electrode and the second electrode are formed on the inclined surface of the recessed portion with the flat surface of the recessed portion interposed therebetween. The method of claim 1, And a bus electrode is formed on the first electrode and the second electrode, respectively.

Images