Browse Prior Art Database

Improved Spacer for Magnetic Matrix Display

IP.com Disclosure Number: IPCOM000122971D
Original Publication Date: 1998-Jan-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Beeteson, JS: AUTHOR [+2]

Abstract

In a Magnetic Matrix Display (MMD), a front screen carrying phospher stripes is separated from a magnetic lens plate by spacers which, while being strong enough to withstand the physical stresses involved, must provide electrical isolation and further must not interfere with the electron beam.

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Improved Spacer for Magnetic Matrix Display

      In a Magnetic Matrix Display (MMD), a front screen carrying
phospher stripes is separated from a magnetic lens plate by spacers
which, while being strong enough to withstand the physical stresses
involved, must provide electrical isolation and further must not
interfere with the electron beam.

      In the design of such spacers, the problem of how to achieve a
narrow tip radius to match the black matrix phosphor stripe width
arises.  In a high resolution display with, for example 0.2mm pixel
pitch, the black matrix stripe may be only 33 wide, and conventional
ceramic and glass spacers do not provide the necessary strength at
these widths.

      The Figure shows an improved spacer design in which a steel
needle tip is molded with a conventional spacer (e.g., molded from
finely ground glass or ceramic particles) such that the steel tip
becomes an integral part of the spacer during the final sintering
process.  This provides a finely radiused high tensile strength tip
embedded into a substantially nonconductive glass or ceramic body.