JPH05121002A - Ac surface discharge type plasma display panel - Google Patents

Abstract

PURPOSE:To increase a utilization factor of ultraviolet radiation to improve luminance and luminous efficiency by applying phosphor even to between the discharge gaps of a group of electrodes of more than a pair covered with an insulator layer. CONSTITUTION:A black bulkhead 5 is arranged on an insulator layer 4 such that a discharge cell is formed. Therefrom, a phosphor 6 is formed between a scanning electrode 2 and a holding electrode 3. A write electrode 8 is formed of aluminium film on a rear face glass substrate 7 in such a direction as the write electrode 8 and electrodes 2, 3 intersect at right angles, and the surface of the electrode 8 is covered with an insulator layer 9 having high visible light reflectivity. A white bulkhead 10 is arranged on the layer 9 such that a discharge cell is formed as in the same way as the black bulkhead 5, and a phosphor 11 is applied to the inner wall and the bottom face of the bulkhead 10. A front glass substrate 1 and the substrate 7 are combined and sealed, and after the panel inside is evacuated in a good vacuum, a dischargeable rare gas, for example, He-Xe gas is led in the panel inside and sealed up. It is thereby possible to improve luminance and luminous efficiency by approx. 10-20%.

Description

Detailed Description of the Invention

[0001]

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

[0002]

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

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 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 practical use of a color plasma display panel, its brightness and luminous efficiency are low. The most common method used for colorizing a plasma display is to excite a phosphor with vacuum ultraviolet rays of 147 nm obtained by emission of Xe as described above. Here, one of the factors that reduce the luminous efficiency is that the utilization efficiency of ultraviolet rays is low. The ultraviolet rays generated by the discharge are scattered in four directions centering on the electrode, and some excite the phosphor coated on the opposite surface, but most of the others are absorbed by the glass plate or the like and converted into heat.

Although a slight improvement can be made by increasing the coating range (area) of the phosphor, in the case of the AC surface discharge type, the ultraviolet rays radiated toward the substrate on the side of the surface discharge electrode are used as light emission for display. I couldn't.

[0009]

In the AC surface discharge type plasma display panel of the present invention, a phosphor is provided both on the substrate facing the substrate on the surface discharge electrode side and on the substrate between the discharge gaps of the surface discharge electrodes. It has a coated structure.

[0010]

In the AC surface discharge type plasma display panel of the present invention, by disposing the phosphor on both of the substrates constituting the panel, it is possible to improve the utilization efficiency of ultraviolet rays, and further increase the luminance and the luminous efficiency.

[0011]

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

On the front glass substrate 1, transparent scan 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 formed in stripes. Here, NES is used for the scan electrode 2 and the sustain electrode 3.
A film was used. On the insulating layer 4, black partition walls 5 containing alumina, low melting point glass or the like as a main component are arranged by a thick film printing method so as to form discharge cells. After MgO is vapor-deposited (not shown) on the entire surface, a phosphor 6 is formed between the scan electrode 2 and the sustain electrode 3 in each cell by a thick film printing method.

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 for sealing. 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.

When this AC surface discharge type plasma display panel is driven, the phosphor 6 is generated by the ultraviolet rays generated by the discharge.
And the phosphor 11 is excited, the insulator layer 4, the scan electrode 2,
Visible light is emitted through the sustain electrode 3 and the phosphor 6.
Display is obtained.

In the conventional AC surface discharge type plasma display panel having no phosphor 6, of the ultraviolet rays generated by the discharge between the scan electrode 2 and the sustain electrode 3, those emitted to the front glass substrate side are visible. Although it is absorbed without being converted into light, in the AC surface discharge type plasma display panel of the present embodiment, the portion irradiated to the phosphor 6 can be utilized as visible light, and the film thickness of the phosphor 6 By optimizing, the luminance and the luminous efficiency were improved by about 10 to 20%.

FIG. 2 is a vertical 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 a recess is formed at a predetermined position of the insulator layer 4 by an etching method, and the phosphor 6 is provided there.
Is embedded by a thick film printing method. Compared with the first embodiment, the portion of the phosphor 6 that is directly exposed to the discharge is reduced, so that the phosphor is less likely to deteriorate.

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

The difference from the first embodiment is that the insulator layer 4 is formed in a stripe shape so as to cover only the surfaces of the scan electrodes 2 and the sustain electrodes, and the phosphor 6 is formed in the gap portion of the insulator layer 4 by a thick film printing method. It is the point that is embedded in. As in the second embodiment, the effect that the phosphor 6 is less likely to deteriorate because the portion where the phosphor 6 is directly exposed to discharge is smaller than that in the first embodiment is the same as in the second embodiment. Since the step of processing the layer 4 by the etching method or the like can be eliminated, there is an advantage that the manufacturing process can be simplified.

[0021]

As described above, in the AC surface discharge type plasma display panel of the present invention, the phosphor is provided both on the substrate facing the surface discharge electrode side substrate and on the substrate between the discharge gaps of the surface discharge electrodes. In the conventional AC surface discharge type plasma display panel having no phosphor on the substrate between the discharge gaps of the surface discharge electrodes, it is caused by discharge between the scan electrodes and the sustain electrodes. Of the ultraviolet rays, those emitted to the front glass substrate side are absorbed by the fluorescent substance on the substrate between the discharge gaps of the surface discharge electrodes compared to those absorbed without being converted to visible light. Because it can be used as
It was possible to improve the luminance and the luminous efficiency by about 20%.

[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 cross-sectional view of an example of a conventional AC surface discharge type plasma display panel.

[Explanation of symbols]

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

Claims (2)

[Claims] 1. A glass substrate having a pair of electrode groups covered with an insulating layer and another glass substrate coated with a phosphor that produces visible light when excited by ultraviolet rays are provided with a gap necessary for discharge. In an AC surface discharge type plasma display panel in which a rare gas capable of being discharged is sealed while being kept sealed, a phosphor is also applied between the discharge gaps of a pair of electrode groups covered with the insulating layer. An AC surface discharge type plasma display panel characterized by the above. 2. The AC surface discharge type plasma display panel according to claim 1, wherein recesses are provided between the discharge gaps of a pair of electrode groups covered with an insulating layer, and the recesses are coated with a phosphor. AC surface discharge type plasma display panel.