Browse Prior Art Database

Conductive Spacers for Display Devices

IP.com Disclosure Number: IPCOM000078537D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Narasimham, MA: AUTHOR

Abstract

In liquid-crystal display cells as well as gas-panel display devices, accessibility to all electrodes is normally obtained via pads on the front (transparent conductor) plate. Spacers are employed on one side of the display cell which are electrically conductive, so that there is continuity from the pads on the front plate to the electrode on the back plate. Glass frit or a fine glass rod (both rich in PbO content) can be used in the fabrication for sealing the cell; which cell, after positioning of the spacers (conductive spacers on the same side as the pads and nonconductor spacers on the opposite side, both of the same thickness), is subjected to a high-temperature process step to fuse the plates together. Such a conductive spacer together with any nonconductor spacer, maintains a desired display cell spacing.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 92% of the total text.

Page 1 of 2

Conductive Spacers for Display Devices

In liquid-crystal display cells as well as gas-panel display devices, accessibility to all electrodes is normally obtained via pads on the front (transparent conductor) plate. Spacers are employed on one side of the display cell which are electrically conductive, so that there is continuity from the pads on the front plate to the electrode on the back plate. Glass frit or a fine glass rod (both rich in PbO content) can be used in the fabrication for sealing the cell; which cell, after positioning of the spacers (conductive spacers on the same side as the pads and nonconductor spacers on the opposite side, both of the same thickness), is subjected to a high-temperature process step to fuse the plates together. Such a conductive spacer together with any nonconductor spacer, maintains a desired display cell spacing.

It was found that aluminum foil forms a very inexpensive source for the conductive spacers. Such aluminum foil is particularly advantageous in that its thin, continuous and tenacious surface offers excellent resistance from further oxidation. In use, the portion of the aluminum spacer which, wetted, by the softened sealing lead-rich glass, reacts with it (giving rise to local precipitation of lead), whereby the assembly is firmly held in position. Since the spacer will be in good surface contact with both the pad and the electrode, electrical continuity is maintained. When required, mica spacers of appropriate thick...