JPH05234520A - Ac surface electric discharging type plasma display panel and manufacture thereof - Google Patents

Abstract

PURPOSE:To alleviate local concentration of an electric field on the edges of electrodes so as to prevent sputtering to insulator layers for covering the electrodes by thickly forming only the insulator layer at the edges of the electrodes out of the surface electric discharging electrodes. CONSTITUTION:Transparent scanning electrodes 2 and maintaining electrodes 3 which are covered with an insulator layer 4 capable of transmitting visible light, and including mainly glass having a low melting point are alternately arranged in a stripe shape on a front glass substrate 1. On the edges of the electrodes 2, 3 printed thickly an insulator thin film is printed thickly 6. Black partition walls containing mainly alumina, glass having a low melting point and the like are printed in a thick film on the insulator layer 4, to be arranged in such a manner as to form electric discharging cells. A writing electrode 8 is formed of an aluminum thin film on a back glass substrate 7 in a stripe shape perpendicularly to the scanning electrodes 2 and the maintaining electrodes 3, to be covered with an insulator layer 9 capable of excellently reflecting visible light, and including mainly glass having a low melting point and TiO2. White partition walls 10 including mainly alumina and glass having a low melting point are printed in a thick film on the insulator layer 9, to be arranged in such a manner as to form electric discharging cells. A phosphor 11 is printed on the inside and bottom of the walls 10. The substrates 1, 7 are combined, and the surroundings thereof are sealed by frit glass, followed by filling with He-Xe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a plasma display panel, and more particularly to the arrangement of electrodes and insulator layers of an AC surface discharge type color plasma display panel.

[0002]

2. Description of the Related Art An example of the structure of a conventional AC surface discharge type plasma display panel is shown in FIGS.

On the front glass substrate 1, transparent scan electrodes 2 and sustain electrodes 3 covered with an insulating layer 4 having visible light transparency are alternately arranged and formed in stripes. Black partitions 5 are arranged on the insulating layer 4 so as to form discharge cells. MgO is vapor-deposited (not shown) on the entire surface from above.

The write electrode 8 is formed on the rear glass substrate 7.
It is formed in a stripe shape in a direction orthogonal to the scan electrodes 2 and the sustain electrodes 3. The insulating layer 9 having a high visible light reflectivity is coated thereon. The white barrier ribs 10 are arranged on the insulator layer 9 so as to form discharge cells like the black barrier ribs 5. The phosphor 11 is applied to the inner wall and the bottom of the white partition wall 10.

The front glass substrate 1 and the rear glass substrate 7 are combined and coated with frit glass (not shown) to seal the periphery. After the inside of the panel is evacuated to a high vacuum, a dischargeable rare gas, for example, He-Xe gas is introduced and sealed.

In this AC surface discharge type plasma display panel, a reverse phase pulse voltage is applied between the scan electrode 2 and the sustain electrode 3 so as to be lower than the discharge start voltage and higher than the sustain voltage. When a pulse voltage higher than the discharge start voltage is applied between the scan electrode 2 and the write electrode 8 which are the intersections of the cells to be lit in that state, a discharge is generated between the scan electrode 2 and the write electrode 8, and this is used as a pilot fire. As a result, a sustain discharge is generated between the scan electrode 2 and the sustain electrode 3. The fluorescent substance 11 is excited by the ultraviolet rays generated by the discharge, passes through the insulating layer 4, the scanning electrode 2 and the sustaining electrode 3, and radiates visible light to obtain a display.

[0007]

In order to put the color AC plasma display panel into practical use, its short life is the biggest obstacle. Therefore, the life is improved by adopting a surface discharge type structure in which the phosphor is not directly exposed to discharge. However, it has become clear that the improvement of life is still not sufficient just by using the surface discharge type.

In the case of the surface discharge type, since the electric field is locally concentrated on the electrode edge portion between the scan electrode and the sustain electrode, the insulating layer covering the electrode is sputtered violently, resulting in a drive voltage. One of the causes of shortening the life is that rising.

In order to prevent the local concentration of the electric field, it is effective to make the thickness of the insulator layer sufficiently thick, but this time there is a problem that the amount of discharge current is limited and the brightness is lowered. ..

[0010]

The AC surface discharge type plasma display panel of the present invention has a structure in which the insulator layer of the electrode edge portion of the surface discharge electrode is thickened.

[0011]

In the AC surface discharge type plasma display panel of the present invention, the electric field is locally concentrated on the electrode edge portion because the insulator layer of the electrode edge portion of the surface discharge electrode is thickened. This is alleviated, and it is possible to prevent the sputtering of the insulating layer covering the electrode, so that the life can be extended.

Further, as compared with the case where the entire insulator layer is thickened,
Since the thin portion of the insulating layer is ensured with a sufficient area, the discharge current amount does not decrease so much, so that it is possible to suppress the decrease in brightness and prolong the life.

[0013]

The present invention will be described below with reference to the drawings. Figure 1
1 is a cross-sectional view of Example 1 of an AC surface discharge type plasma display panel according to the present invention.

Transparent scanning electrodes 2 and sustain electrodes 3 covered with an insulating layer 4 having a low melting point glass as a main component and having a visible light transmittance are alternately arranged and formed on the front glass substrate 1 in a stripe pattern. To do. Here, for the scan electrode 2 and the sustain electrode 3, a NES film formed by CVD to a thickness of about 1 μm was used, and the thickness of the insulator layer 4 was set to about 20 μm.
The insulator layer 6 is formed on the insulator layer 4 in the gap between the scan electrode 2 and the sustain electrode 3 so as to cover the electrode edge portions of the scan electrode 2 and the sustain electrode 3 by a thick film printing method to a thickness of about 5 μm. Was formed. A black partition containing alumina, low melting point glass or the like as a main component is formed on the insulating layer 4 so as to form a discharge cell.
The thickness is set to about 0 μm by the film thickness printing method. MgO is vapor-deposited on the entire surface (not shown).

The writing electrode 8 is formed on the rear glass substrate 7.
The thin aluminum film is formed in a stripe shape in a direction orthogonal to the scan electrodes 2 and the sustain electrodes 3. An insulating layer 9 having a low melting point glass and titanium oxide as a main component and having high visible light reflectivity is coated thereon. On the insulating layer 9, a white partition wall 10 containing alumina, low melting point glass or the like as a main component is arranged by a thick film printing method so as to form a discharge cell like the black partition wall 5. The phosphor 11 is applied to the inner wall and the bottom of the white partition 10 by a thick film printing method.

The front glass substrate 1 and the rear glass substrate 7 are combined and coated with frit glass (not shown) on the periphery to be sealed. After the inside of the panel is evacuated to a high vacuum, a dischargeable rare gas, for example, He-Xe gas is introduced and sealed.

A conventional AC in which the insulator layer 6 is not formed on the insulator layer 4 above the gap between the scan electrode 2 and the sustain electrode 3.
The surface discharge type plasma display panel had a life of about 6000 hours for displaying a television image, whereas the AC surface discharge type plasma display panel of this example provided a long life of about 10,000 hours under the same conditions. ..

FIG. 2 is a sectional view of an AC surface discharge type plasma display panel according to a second embodiment of the present invention.

The difference from the first embodiment is that the front glass substrate 1
At a position corresponding to a gap between the scan electrode 2 and the sustain electrode 3 of
As shown in FIG. 2, the front glass substrate 1 is provided with a recess by an etching method in advance. This eliminates the need for overprinting the insulating layer.
There is an advantage that the film thickness of the insulating layer in the gap between the scan electrode 2 and the sustain electrode 3 can be increased without variation in the operating voltage due to the printing position shift and the yield can be increased.

FIG. 3 is a sectional view of a third embodiment of an AC surface discharge type plasma display panel according to the present invention.

The difference from the first embodiment is that the insulating layer 6 is independently provided in each edge portion of the scan electrode 2 and the sustain electrode 3. The other points are the same as in the first embodiment.

[0022]

As described above, since the AC surface discharge type plasma display panel of the present invention has a structure in which the insulating layer of the electrode edge portion of the electrode group is thickened, an electric field is generated in the electrode edge portion. Local concentration was relieved, spattering on the insulator layer covering the electrode was prevented, and the life was extended.

Further, compared to the case where the entire insulator layer is thickened,
Since the thin portion of the insulating layer is ensured with a sufficient area, the discharge current amount does not decrease so much, so that it is possible to suppress the luminance decrease and prolong the life.

Needless to say, the present invention can be implemented with other AC surface discharge type plasma display panels.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a second embodiment of the present invention.

FIG. 3 is a vertical sectional view of a third embodiment of the present invention.

FIG. 4 is a vertical sectional view of a conventional example.

FIG. 5 is a perspective view of a conventional example.

[Explanation of symbols]

 1 Front Glass Substrate 2 Scan Electrode 3 Sustaining Electrode 4 Insulator Layer 5 Black Partition 6 Insulator Layer 7 Rear Glass Substrate 8 Writing Electrode 9 Insulator Layer 10 White Partition 11 Phosphor

Claims (1)

[Claims] 1. A glass substrate having a pair of electrode groups covered with an insulating layer and another glass substrate having an electrode group covered with an insulating layer are sealed with a gap required for discharge maintained. In the AC surface discharge type plasma display panel in which a noble gas capable of discharging is enclosed in the gap, a structure in which an insulating layer of an electrode edge portion of the electrode group is thicker than other electrode portions is formed. An AC surface discharge type plasma display panel comprising.