Browse Prior Art Database

Gas Panel Repair by Means of Pressure Clamped Connections

IP.com Disclosure Number: IPCOM000047381D
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 52K

Publishing Venue

IBM

Related People

Costa, MJ: AUTHOR [+2]

Abstract

A method for repairing open lines in a plasma display panel by means of discrete auxiliary repair conductors is disclosed in U.S. Patent 4,304,450. A variation, in which part of the auxiliary repair circuit is fabricated with the display line pattern on the glass plate during the photolith process is described in the IBM Technical Disclosure Bulletin 24, 908-909 (July 1981). Both methods require solder bonding of wire conductors to repair pads on the panel terminations. Using chrome-copper-chrome conductors, soldered attachment necessitates removal of the top chrome layer from the panel metallurgy to expose the solderable copper layer. However, removal of the top chrome film by chemical etching adds an additional process step to the panel fabrication.

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Gas Panel Repair by Means of Pressure Clamped Connections

A method for repairing open lines in a plasma display panel by means of discrete auxiliary repair conductors is disclosed in U.S. Patent 4,304,450. A variation, in which part of the auxiliary repair circuit is fabricated with the display line pattern on the glass plate during the photolith process is described in the IBM Technical Disclosure Bulletin 24, 908-909 (July 1981). Both methods require solder bonding of wire conductors to repair pads on the panel terminations. Using chrome-copper-chrome conductors, soldered attachment necessitates removal of the top chrome layer from the panel metallurgy to expose the solderable copper layer. However, removal of the top chrome film by chemical etching adds an additional process step to the panel fabrication. One conventional panel design disclosed in the above referenced patent employs two sets of lands on the panel terminations: a set of repair lands for solder attachment and the conventional terminals for connecting line drivers to the panel for mechanically clamped attachment. A wide panel termination is required to accommodate both sets of lands which, in turn, contributes to poor panel faceprint, i.e., the ratio of active display area to overall frontal area. A repair method for open conductors in a plasma display device employing mechanical clamping for both line driver and repair circuit attachment is described here.

Clamping eliminates the need for chrome removal from panel lands, while combining both external and repair lands into a single grouping. The resulting reduction in termination width improves panel faceprint. The figure illustrates an exploded view of a conformal driver board 2 in position on panel termination 3. Also shown is auxiliary repair conductor 5 and repair tab 1 positioned to repair open display conductor 15. Land 4 on repair tab 1 is aligned with th...