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US 5,994,828 AGranted
Picture display device with addressing system
AssigneeU.S. Philips Corporation
InventorsSiebe T. De Zwart, Gerardus G. P. Van Gorkom, Theunis S. Baller
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AssigneeU.S. Philips Corporation
InventorsSiebe T. De Zwart, Gerardus G. P. Van Gorkom, Theunis S. Baller
Estimating the term…
Thin-panel picture display device having a luminescent screen and a large emitting plane electron source, such as a large number of juxtaposed electron propagation ducts operating by means of wall interaction of electrons. By means of an addressing system, electrons extracted from ducts are directed towards desired locations on the luminescent screen. The addressing system comprises a preselection system and a fine-selection system with an intermediate spacer plate of insulating material provided with apertures for passing electrons arranged in between. To provide the possibility of applying large voltage differences across the thickness of the spacer plate, the walls of the apertures are at least partly coated with a coating of a low .delta. material having a low secondary emission coefficient (.delta..sub.max .ltoreq.3.5), particularly Si.sub.3 N.sub.4, AlN, Cr.sub.2 O.sub.3 or Y.sub.2 O.sub.3.
A picture display device having a vacuum envelope which is provided with a transparent face plate and a display screen having a pattern of luminescent pixels, and with a rear wall, comprising a large emitting plane electron source, an addressing system arranged between said large emitting plane electron source and the face plate so as to address desired pixels, said addressing system comprising a preselection system and a fine-selection system, and, at a position between said selection systems, an intermediate spacer which, adjacent to the preselection system, comprises a first intermediate plate of insulating material provided with apertures for passing electrons, characterized in that the side walls of the apertures in the first intermediate plate are at least partly coated with a coating having a maximal secondary emission coefficient of at most 3.5.
An addressing system for a display device, which addressing system comprises a preselection system and a fine-selection system, with an intermediate spacer at a position between these selection systems, which spacer, adjacent to the preselection system, comprises a first intermediate spacer plate of insulating material provided with apertures for passing electrons, characterized in that the side walls of the apertures in the first intermediate plate are at least partly coated with a coating having a maximal secondary emission coefficient of at most 3.5.
Dependencies are inferred from the claim text.