JPH0430759Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Field of industrial application] This invention uses the discharge of a rare gas sealed inside.
The present invention relates to plasma display panels that display characters, numbers, figures, etc., and particularly relates to high contrast, fine pitch, and improved visibility of large-capacity plasma display panels.

[Conventional technology]

In recent years, plasma display panels have become extremely popular as information terminal display devices that display graphics, characters, etc.
Panels with large capacity and high contrast are required. Usually, a transparent electrode of stannic oxide, commonly known as a NESA electrode, is formed as an electrode on the front substrate, but as mentioned above, it is necessary to expand the display capacity.
With the increase in fine pitch, it is necessary to reduce the line width of the NESA electrode, which causes problems such as increased resistance of the NESA electrode and disconnection of the NESA electrode. In order to solve this problem, a method is known in which a low-resistance auxiliary electrode (hereinafter referred to as a tracer) mainly composed of silver or the like is run along the edge of the NESA electrode.

This tracer has the effect of reducing the resistance of the NESA electrode and, if there is a break in the NESA electrode, connecting the broken line. FIG. 2 is a cross-sectional view of such a conventional panel, in which a transparent NESA electrode 3 is formed on the front substrate 1, and along the edge of the NESA electrode 3, a tracer 6 containing silver as a main component and colored black is shown. is wired. The gap between the tracer 6 and the adjacent Nesa electrode is covered with a mask layer 5 made of a black insulator for the purpose of improving contrast. Further, a transparent dielectric film 7 is formed to cover the NESA electrode 3 and the mask layer 5. On the other hand, a silver electrode 4 is formed on the rear substrate 2 and is perpendicular to the NESA electrode 3, and the silver electrode 4 is covered with a black dielectric film 9.

An insulating layer (channel) 8 defining a discharge gap is formed on the transparent dielectric film 7 so as to be perpendicular to the NESA electrode 3. On the black dielectric film 9 on the rear substrate 2 side, there is a channel 1 that combines with the channel 8 on the front substrate side to define a discharge gap.
0 is formed perpendicular to the silver electrode 4, the channel 8 faces the gap between the silver electrodes 4, and the mask layer 5 faces the channel 10.
The panel is assembled with the rear substrate 2 facing each other.

[Problem that the invention attempts to solve]

In the above-mentioned conventional plasma display panel, the front substrate is usually made of plate glass, especially inexpensive soda glass, and the tracer is in contact with the soda glass at the gap between the NESA electrodes. In such a structure, the gap between the NESA electrodes where the tracer contacts the soda plate changes color to yellow-green or yellow. This is because metal elements such as Ag, Cr, and Ru contained in the tracer are impurities (Bi, K, etc.) contained in trace amounts in the soda glass.
This is thought to be due to the reaction and color development. Like this,
When the area between the NESA electrodes develops color, the entire panel appears colored, and the display contrast is significantly deteriorated, resulting in a disadvantage that the display quality is significantly impaired.

[Means for solving problems]

The present invention was developed to solve these drawbacks, and includes a front substrate having a first electrode group covered with a transparent dielectric film, and a second electrode group covered with a dielectric film. A rear substrate having an electrode group is hermetically sealed with the first electrode group and the second electrode group facing each other so as to obtain a predetermined discharge space, and a dischargeable gas is sealed inside. In a plasma display panel consisting of a plasma display panel, an insulating film for a mask is formed on the surface of a part of each electrode of the first electrode group and on the front substrate in the gap between each electrode of the first electrode group; Along the boundary line between the insulator film and the first electrode group, a group of auxiliary electrodes (tracers) electrically connected to the first electrode group are placed on the mask insulator film and the first electrode group. A plasma display panel is obtained which is characterized in that it is provided so as to straddle both sides of the electrode group.

〔Example〕

Next, the present invention will be explained using the drawings.

FIG. 1 is a sectional view of a plasma display panel according to the present invention, and the same members as in FIG. 2 are given the same reference numerals.

In FIG. 1, 1 is a front substrate made of soda sheet glass, and 2 is a rear substrate also made of soda sheet glass. Reference numeral 3 denotes a plurality of NESA electrodes formed on the front substrate 1 in parallel to each other. Further, reference numeral 4 denotes a plurality of silver electrodes formed on the rear substrate 2 by screen printing, and a plurality of silver electrodes are formed so as to be perpendicular to the Nesa electrodes 3. After forming the NESA electrodes 3 on the front substrate 1, a mask layer 5, which is a black insulating layer, is formed in the gap between each of the NESA electrodes 3 to a thickness of about 15 μm by screen printing. One end of the mask layer 5 is formed so as to partially overlap the NESA electrode 3. Thereafter, a tracer colored black by mixing low melting point glass and ruthenium oxide and containing silver as a main component is applied to the NESA electrode 3 along the boundary line between the NESA electrode 3 and the mask layer 5 and on the mask layer 5. 6 is formed by a screen printing method. After that, Nesa electrode 3,
A transparent dielectric film 7 is formed by screen printing so as to cover the entire area including the mask layer 5 and the tracer 6, but the tracer 6 is not brought into contact with the front substrate 1 and is coated with the NES electrode 3 and the mask layer. 5
By forming it on top, coloring due to the tracer, which conventionally occurs between the NESA electrodes, can be prevented. A channel 8 mainly composed of aluminum oxide powder and low melting point glass is formed on the transparent dielectric film 7 to a thickness of about 50 μm and perpendicular to the NESA electrode 3 by screen printing.

On the other hand, the silver electrode 4 on the rear substrate side is covered with a black dielectric film 9 to improve the contrast of the panel, and then a channel 10 with a thickness of about 50 μm is formed so as to be perpendicular to the silver electrode 4. to form. Thereafter, the front substrate 1 and the rear substrate 2 are faced to each other so that the channel 8 faces the gap between the silver electrodes 4 and the mask layer 5 faces the channel 10, as in the conventional panel, and the periphery of the panel is sealed. Agent 11
Hermetically sealed.

[Effect of idea]

As explained above, according to the present invention, the tracer that reduces the resistance of the NESA electrode and prevents disconnection,
Because wiring can be done without contacting the front substrate, the gap between the Nesa electrodes does not develop a yellow-green or yellow color as in the conventional case, and the black mask layer and black dielectric film on the rear substrate side allow for high contrast and fine pitch. , a large capacity plasma display panel can be obtained.

[Brief explanation of drawings]

FIG. 1 shows a cross section of a plasma display panel according to the present invention, and FIG. 2 shows a cross section of a conventional plasma display panel. 1 and 2, 1...Front substrate, 2...Rear substrate, 3...Nesa electrode, 4...Silver electrode, 5...Mask layer, 6...Tracer, 7...Transparent dielectric material Film, 8, 10... Channel, 9... Black dielectric film, 11... Sealing agent.

Claims (1)

[Scope of utility model registration request] A front substrate having a first electrode group covered with a transparent dielectric film and a rear substrate having a second electrode group covered with a dielectric film are connected to the first electrode group and the second electrode group. In a plasma display panel, each of the first electrode groups is opposed to each other and hermetically sealed to obtain a predetermined discharge space, and a dischargeable gas is filled inside. An insulating film for a mask is formed on the front substrate of a part of the surface of the electrode and in the electrode gap of each of the first electrode group, and on the boundary line between the insulating film for a mask and the first electrode group. A plasma display characterized in that an auxiliary electrode group electrically connected to the first electrode group along the mask is provided so as to span both the mask insulating film and the first electrode group. ·panel.