CRT electron gun with luminance controlled by a minimum spot dia

Details CRT electron gun with luminance controlled by a minimum spot dia CRT electron gun with luminance controlled by a minimum spot dia

1997-11-14

1998-07-28

Pascal, Robert J.

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

315366, 345 12, 345 74, 345149, H01J 2952

Patent

active

057866694

ABSTRACT:
An electron gun and a CRT capable of accomplishing a reduction in spot diameter of electron beams, an increase in drive speed and control of luminance while being simplified in structure. Field emission cathodes acting as the electron source for the electron gun are arranged in the form of or divided into plurality of the small regions S for matrix driving, to thereby control luminance of the CRT depending on the number of small regions S selected. Thus, luminance control over any desired number of gradations which exhibits satisfactory resistance to noise and linearity can be realized while simplifying the structure, resulting in the field emission cathodes being highly conveniently applied to the electron gun of the CRT, leading to an improvement in functionality of the CRT.

REFERENCES:
patent: 4857799 (1989-08-01), Spindt et al.
patent: 5068579 (1991-11-01), Tomii et al.
patent: 5103144 (1992-04-01), Dunham
patent: 5103145 (1992-04-01), Doran
patent: 5363021 (1994-11-01), MacDonald

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