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US 4,302,706 AGranted
Glass-to-glass sealing method with conductive layer
AssigneeWagner Electric Corporation
InventorRichard DuBois
Life of this patent
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Abstract
A glass-to-glass seal with an intervening layer of metal oxide is made using a frit containing a high lead content and a metallic nucleating agent. The metal oxide may optionally be used to provide conductive paths through the seal without embedded metallic conductors.
Claims3
A method of sequentially multiplexing the glow of a plurality of characters in a multicharacter vacuum fluorescent display device of the type having anodes on a substrate, a filament and a glass cover plate sealed by a seal to said substrate forming between them a sealed enclosure, comprising the steps of:
- (a) placing independently energizeable, transparent, conductive layers on said glass cover plate, at least a portion of each respectively facing each of said characters, said layers being on the opposite side of said filament from said anodes;
- (b) extinguishing the glow on all but a first of said characters by placing a positive voltage on the said conductive layers facing all the other characters;
- (c) energizing said first character by placing a voltage on the conductive layer facing it that is less positive than said positive voltage;
- (d) continuously sequencing through the energization of each of said characters;
- and
- (e) completing one sequence through the energization of said characters in less than 100 milliseconds.
3 more elements
Dependencies are inferred from the claim text.