Appeal No. 1999-0541
Application No. 08/599,436
to Appellants, in conventional field emission displays, a large
number of secondary electrons are created within the phosphor
screen due to reflection or scattering of incident electrons and
charge build up on the phosphors (specification, page 5). Some
of the high energy electrons escape back into the vacuum and can
apparently lead to a shift in the surface potential of the
phosphor causing diminished light output and unstable emission
(specification, pages 5 & 6). Appellants’ invention provides for
a display having reduced threshold voltage by surrounding the
phosphor regions with a matrix comprised of conductive or
metallic particles (specification, page 9).
Representative independent claim 13 is reproduced as
follows:
13. A field emission display comprising:
a cathode having a number of emitters for emitting
electrons, and
a faceplate screen having:
a substrate,
a conductive layer formed over the substrate,
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