Plasma display panel

Abstract

A plasma display panel includes a front substrate and a rear substrate that are opposed to each other with a discharge gas space between them, and a sealing material for sealing the front substrate and the rear substrate at their peripheral portions. The sealing material contains an appropriate quantity of spacers so that a thickness of the plasma display panel is uniform along the entire perimeter of the sealing portion between the front substrate and the rear substrate. The sealing material contains non-porous beads as the spacers, preferably at a ratio within the range of 0.05-2.0 wt %.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a plasma display panel (PDP), which is characterized in a structure of a sealing material that is used for sealing a front substrate and a rear substrate. [0003] 2. Description of the Prior Art A plasma display panel includes a front substrate and a rear substrate, which are both larger than a screen. The front substrate and the rear substrate are opposed to each other and sealed with a sealing material that is arranged at the outer portion of the screen and has a frame-like shape so that a closed discharge gas space is defined by them. The front substrate and the rear substrate are glass substrates, while the sealing material is a burned material of low melting point glass. [0004] Among plasma display panels having such a structure, a surface discharge type plasma display panel for use as a color display includes partitions that prevent discharge interference between neighboring cel...

AI Technical Summary

Benefits of technology

[0012] According to the present invention, a sealing material containing non-porous bead spacers is used for sealing the front substrate and the rear substrate that are opposed to each other defining a discharge gas space. A “non-porous bead” in the present invention means a bead having a small value of specific surface area such that the viscosity of the sealing paste to be the sealing material is not altered substantially when the beads are added into the sealing material.

[0013] According to the present invention, the thickness of the plasma display panel can be made uniform along the entire perimeter of the sealing portion between the front substrate and the rear substrate, so that an appropriate contact between the front substrate and the rear substrate can be obtained along the entire perimeter inside the sealing portion. Thus, generation of a noise due to the malcontact can be prevented.

Problems solved by technology

The malcontact between the front substrate and the rear substrate inside the sealing portion may cause an abnormal noise during a display operation.

When a high frequency drive voltage is applied for a display, periodical electrostatic attraction may vibrate the glass substrates locally, so that a low level of noise at an audible frequency is generated.

This noise may deteriorate quality of display operation.

If a quantity of the spacers is insufficient, the spacers may be broken by an excessive pressure per spacer.

However, a classification work for obtaining glass beads of a sharp distribution of granularity causes increase of cost of the glass beads.

It is difficult to remove smaller particles compared with removal of larger particles than a desired size.

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