Luminance control for cathode-ray tube having field emission cat

Details Luminance control for cathode-ray tube having field emission cat Luminance control for cathode-ray tube having field emission cat

1990-09-05

1992-04-07

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315366, 313309, 313336, H01J 2952

Patent

active

051031450

ABSTRACT:
A field emission cathode for use in a cathode-ray tube (CRT) includes groups of electron emission cells that produce different degrees of luminance on the phosphor-coated CRT screen. The cells replace the conventional CRT cathode and are fabricated on a planar surface. Each cell comprises a fixed number of discrete electron emitters, and the groups comprise different numbers of cells, typically in binary relation to one another. The cell groups of are interconnected via separate drive lines; each group is activated by applying voltage to its line. Different combinations of groups may be activated to achieve different brightness intensities on the CRT screen. A cathode having fifteen cells arranged in four groups (1, 2, 4 and 8 cells) is capable of producing sixteen shades of gray.

REFERENCES:
patent: 3755704 (1973-08-01), Spindt et al.
patent: 4575765 (1986-03-01), Hirt
patent: 4818914 (1989-04-01), Brodie
patent: 4940916 (1990-07-01), Borel et al.
patent: 4987377 (1991-01-01), Gray et al.

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