Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Patent
1994-10-28
1996-08-27
Gonzalez, Frank
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
3151693, 315167, 313309, 313336, G09G 310
Patent
active
055504353
ABSTRACT:
It is the object of the invention to provide a field emission cathode apparatus comprising plural electron-emitters which eliminates nonuniformity of electric emission density over an emissive area, controls emission currents by active devices, and improves reliability of the apparatus. P-type silicon 5 and n-type silicon 4 are formed on n.sup.+ -type silicon 6. On n-type silicon 4, an electron-emitter 1 made of Mo is formed, and electron-emitter 1 is surrounded by a grid electrode 2 and an insulator layer 3. N-type silicon 4 serves as a channel region of a junction gate field effect transistor, and a current flowing through it is controlled by a voltage applied to p-type silicon 5. Accordingly, an electron current emitted from electron-emitter 1 is also controlled by this transistor, and by setting up an operation region of this transistor in a saturation current region, nonuniformity of electron emissions from electron-emitters can be improved. Even when a portion of cathodes is damaged, the damage is not magnified to the whole apparatus, and the life of the field emission cathode can be prolonged.
REFERENCES:
patent: 4940916 (1990-07-01), Borel et al.
patent: 5162704 (1992-11-01), Kobori et al.
patent: 5212426 (1993-06-01), Kane
"Field Effect Controlled Vacuum Field-Emission Cathodes", by Ting et al., Tech. DIG. of IVMC 91, Nagahama 1991, pp. 200-201.
Kuriyama Toshihide
Makishima Hideo
Gonzalez Frank
NEC Corporation
Ratliff Reginald A.
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