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Elimination of Plasma Display Optical Defects

IP.com Disclosure Number: IPCOM000060608D
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Parker, DE: AUTHOR

Abstract

In-process handling of the glass plates used in the fabrication of plasma display panels often produces scratches or other blemishes on the front surface of the plates. In addition, glass frit and foreign material deposited on this surface during thermal processing steps results in unacceptable optical defects. Some of these defects are small, and are rendered invisible when an anti-glare shield is epoxy bonded to the front surface of the panel faceplate. The balance of the plates, however, is unacceptable resulting in significant yield degradation in th fabrication process.

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Elimination of Plasma Display Optical Defects

In-process handling of the glass plates used in the fabrication of plasma display panels often produces scratches or other blemishes on the front surface of the plates. In addition, glass frit and foreign material deposited on this surface during thermal processing steps results in unacceptable optical defects. Some of these defects are small, and are rendered invisible when an anti-glare shield is epoxy bonded to the front surface of the panel faceplate. The balance of the plates, however, is unacceptable resulting in significant yield degradation in th fabrication process.

A two-step method for upgrading these optical defects operates as follows. Initially, the defects are enlarged by use of a high speed, hand held grinding tool with an abrasive impregnated rubber tip. Scratches and gouges are widened, w the glass frit and foreign material are removed to below the substrate surface. These defects are then polished with a 3-micron diamond grit paste on a pad or high speed rotary brush. The polished area is slightly enlarged beyond the defect area to provide an edgeless blended appearance.

At this point, the defects are often more noticeable than they were originally. However, it has been demonstrated that widening and smoothing the defect profile allows the antiglare shield epoxy to optically clear even gross defects. An appropriate optical index oil such as propylene glycol is used process to determine whether the g...