Electric lamp and discharge devices – Electrode and shield structures – Point source cathodes
Patent
1995-05-30
1996-12-31
O'Shea, Sandra L.
Electric lamp and discharge devices
Electrode and shield structures
Point source cathodes
313309, 313310, 313351, H01J 102
Patent
active
055897282
ABSTRACT:
An electron emitter plate (110) for an FED image display has an extraction (gate) electrode (22) spaced by a dielectric insulating spacer (125) from a cathode electrode including a conductive mesh (18). Arrays (12) of microtips (14) are located in mesh spacings (16), within apertures (26) formed in clusters (23) in extraction electrode (22). Microtips (14) are deposited through the apertures (26). Apertures (26) are arranged in regular, periodic arrays (23, 23', 123, 123') defining lattices having occupied apertured positions and internal unapertured vacancy positions (150, 150'). The insulating spacer (125) is etched to undercut electrode (22) to connect apertured lattice positions, forming a common cavity (141) for microtips (14) within each mesh spacing (16), and leaving central posts (143) at the unapertured vacancies (150, 150'). The etch-out reduces the dielectric constant factor of gate-to-cathode capacitance in the finished structure. Placing posts at vacancy positions enables gate support over the cavity without sacrificing high microtip density.
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Levine Jules D.
Shen Chi-Cheong
Taylor Robert
Brady III Wade James
Donaldson Richardson L.
Franz Warren L.
Haynes Mack
O'Shea Sandra L.
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