Deflecting apparatus for a flat-panel display illuminated by ele

Details Deflecting apparatus for a flat-panel display illuminated by ele Deflecting apparatus for a flat-panel display illuminated by ele

1996-12-02

1998-11-03

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313422, H01J 2970, H01J 2972

Patent

active

058313974

ABSTRACT:
A deflecting apparatus for a flat-panel display having an evacuated display housing and a display screen. The display has phosphor stripes or dots for generating visible radiation when bombarded with electrons when accelerating voltage V.sub.1 is applied to stripes. The invention provides for an elongate electron source positioned in the back of the evacuated display housing for emitting electrons which are guided to the display screen through an anode grid or an electron gating grid located before the display screen. The deflecting apparatus for rendering the beam of electrons emitted from the elongate electron source uniform has a deflecting element or unit which is positioned at the back of the display housing and produces a spatially parabolic potential under the influence of steering potential V.sub.4. This spatially parabolic potential forces the electrons moving in the direction of the anode grid or gating grid to form a uniform beam. The deflecting apparatus of the invention can also be used to focus electrons to a narrow beam forming a "knife edge".

REFERENCES:
patent: 3746909 (1973-07-01), Runtzel et al.
patent: 4794306 (1988-12-01), Tischer et al.
patent: 4973888 (1990-11-01), Morimoto et al.
patent: 5436530 (1995-07-01), Suzuki et al.

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