JPH11167871A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reflectance without deteriorating a breakdown voltage of a data electrode side dielectric layer. SOLUTION: A data electrode 3 is formed on a back face glass substrate 1b, a transparent dielectric layer 12 containing no pigment is formed as to cover the data electrode, and further a white dielectric layer 13 containing a pigment such as TiO2 , Al2 O3 is formed. The transparent dielectric layer 12 improves the insulating property of the data electrode side dielectric layer and the white dielectric layer 13 improves the reflectance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a plasma display panel, and more particularly, to a data substrate dielectric layer.

[0002]

2. Description of the Related Art The structure of a conventional plasma display panel will be described with reference to FIG. On a front glass substrate 1a serving as a display surface, a transparent sustaining electrode 2a and a transparent scanning electrode 2b are formed in stripes of SnO ₂ , ITO, or the like, perpendicular to the drawing paper and parallel to each other. IT is provided on the transparent sustaining electrode 2a and the transparent scanning electrode 2b, respectively.
Since the surface resistance value of O or the like is relatively high, the bus electrode 9 is formed of a metal such as Ni or Cr to reduce the resistance. A scanning-side dielectric layer 6a of lead glass for holding required charges and protecting the electrodes from plasma, and a magnesium oxide thin film 1 for protecting the electrodes and improving discharge characteristics are provided on the electrodes.
1 is formed.

[0003] On the back glass substrate 1b,
The striped data electrodes 3 are formed of a metal such as Cr. On the data electrode 3, a white data electrode-side dielectric layer 6b for protecting the electrode and increasing the reflectance is formed. Further, a partition 4 is formed thereon. The partition has a function of maintaining a gap between the two glass substrates and a function of eliminating light leakage from adjacent pixels and the effect of ultraviolet rays. Red, blue,
A phosphor 8 that emits green monochromatic light is formed.

In such a plasma display panel, the white dielectric layer of the back glass substrate is conventionally formed by using a transparent dielectric material mixed with a metal oxide such as TiO ₂ or Ai ₂ O _3. It had been.

As a prior art relating to a dielectric layer of a plasma display, Japanese Patent Application Laid-Open No. 2-273439 discloses a technique in which a transparent insulating layer is formed into two layers to improve discharge characteristics and wettability with a substrate glass. In this conventional example, since the wettability with respect to the glass substrate is insufficient, the insulating layer is made of a lower insulating film made of a low-melting glass mainly containing PbO to which ZnO is added, and a low insulating film mainly made of PbO to which CeO ₂ is added. It has a two-layer structure in which an upper insulating film made of melting glass is laminated.

Further, Japanese Patent Application Laid-Open No. Hei 7-134947 discloses a technique in which a dielectric layer has a two-layer structure to maintain the insulating property and extend the life. In this conventional example, an electrode is formed on a dielectric layer, and a main discharge with an opposing electrode sputters a conductive substance from the former electrode. A method is disclosed in which a conductive dielectric material layer is used and a sputtered conductive material is attached to the porous portion to prevent the porous material.

[0007]

When the dielectric layer is formed of a material obtained by mixing a metal oxide with a transparent dielectric material, the dielectric layer has a higher withstand voltage than a dielectric layer formed of only a transparent dielectric material. Lower. This is because the metal oxide lowers the withstand voltage.

In order to increase the insulating property of the data electrode side dielectric layer, there are methods of increasing the thickness of the dielectric layer and removing metal oxides in the data electrode side dielectric layer. However, there is a drawback that when the dielectric layer is thickened, the driving voltage of the panel increases. In addition, when the metal oxide in the data electrode side dielectric layer is removed, the reflectance decreases, and the luminance at the time of panel light emission decreases.

In Japanese Patent Application Laid-Open No. 273439/1990, the insulating film is made into two layers. The purpose is to improve the wettability of the insulating layer on the glass substrate provided with the electrodes. Since a substance is included, a decrease in withstand voltage cannot be avoided. Also, Japanese Patent Application Laid-Open No. 7-13 / 1995
No. 4947 only shows a method for preventing a decrease in insulation caused by the attachment of a sputtered conductive substance with a dielectric layer of a porous material, but not a method for preventing breakdown due to a voltage applied to the dielectric layer.

[0010]

According to the present invention, there is provided a plasma display panel in which a data electrode formed on a glass substrate is covered with a dielectric layer, wherein the dielectric layer comprises a transparent dielectric layer containing no metal oxide pigment. , And Ti on it
_{2 of} a white dielectric layer containing a pigment such as O ₂ and Al ₂ O ₃
It is characterized by being formed of a layer.

The transparent dielectric layer containing no pigment improves the insulating property of the data electrode side dielectric layer, and the presence of the white dielectric layer can increase the reflectance.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention, and is a sectional view showing a dielectric layer structure of a data electrode side substrate. The data electrode 3 is formed of Ag or the like on the back glass substrate 1b. A dielectric paste mainly containing lead borosilicate glass containing no pigment and containing 30 to 70% of PbO is applied on the data electrode 3 by screen printing so as to cover the data electrode 3. After drying, firing is performed at a firing temperature of 500 to 600 ° C. for a firing time of 5 to 60 minutes to form the transparent dielectric layer 12. Next, a white dielectric containing a TiO ₂ or Al ₂ O ₃ pigment is applied to the dielectric paste in the same pattern as the transparent dielectric layer 12 in the same manner, dried, and baked at a temperature of 500 to 600 ° C. Baking is performed under the conditions of a baking time of 5 to 60 minutes and the white dielectric layer 13 is formed.
To form a dielectric layer of the back glass. It should be noted that 30 to 70% of PbO containing no pigment
Is applied by a screen printing method so as to cover the data electrodes and dried, and then the dielectric paste is coated with TiO ₂ or Al ₂ O.
₃ containing the pigment in the same manner and dried,
The transparent dielectric layer 12 and the white dielectric layer 13 may be formed simultaneously by baking at a baking temperature of 500 to 600 ° C. and a baking time of 5 to 60 minutes. The thickness of the dielectric layer after firing is 5 to 30 μm for the transparent dielectric layer 12 and 5 to 3 μm for the white dielectric layer 13.
0 μm.

The thickness of the data electrode side dielectric layer is about 20.
A plasma display of about 7 inches made of only a conventional white dielectric layer at μm and a transparent dielectric layer of about 14 inches of the present invention.
A 7-inch plasma display made of two dielectric layers of about 6 μm and a white dielectric layer was subjected to a withstand voltage test of a DC voltage load. It was confirmed that double withstand voltage was obtained.

Since the white dielectric used in the present invention does not need to consider the withstand voltage, the content of the metal oxide can be made larger than that of the conventional white dielectric. Therefore, the reflectivity can be made equal to or higher than that of the conventional dielectric layer.

In the above embodiment, the structure of the dielectric layer is a transparent dielectric for the lower layer and a white dielectric for the upper layer. However, similar effects can be obtained by using a white dielectric for the lower layer and a transparent dielectric for the upper layer. In the above description, the transparent and white dielectric layers are described. However, the same effect can be obtained by forming three or more transparent, transparent, and white dielectric layers without changing the total film thickness. Is obtained.

[0016]

When the data electrode-side dielectric layer is formed by using one type of dielectric paste in the related art, there is a trade-off between the withstand voltage and the reflectance, so that it is impossible to improve the performance of both. Was. According to the present invention, by separating the dielectric layer into two layers, the dielectric layer containing no metal pigment plays a role of increasing the withstand voltage, and the dielectric layer containing the metal pigment plays a role of increasing the reflectance. Therefore, a dielectric layer having a high withstand voltage and a high reflectivity can be obtained without a design change or a work change, so that a highly reliable and high-brightness plasma display panel can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a dielectric layer of a back glass substrate showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional plasma display panel.

[Explanation of symbols]

 1a Glass substrate serving as display surface 1b Back glass substrate 2 Transparent electrode 2a Transparent sustaining electrode 2b Transparent scanning electrode 3 Data electrode 4 Partition wall 5 Discharge space 6a Scanning dielectric layer 6b Data electrode dielectric layer 8 Phosphor 9 Bus electrode 10 Resist 11 Magnesium oxide thin film 12 Transparent dielectric layer 13 White dielectric layer

Claims (2)

[Claims] 1. A plasma display panel in which a data electrode formed on a glass substrate is covered with a dielectric layer, wherein the dielectric layer comprises: a dielectric layer containing no metal oxide pigment; A plasma display panel formed of at least two white dielectric layers containing a pigment. 2. The plasma display panel according to claim 1, wherein the pigment of the metal oxide is TiO ₂ or Ai ₂ O ₃ .