Device for generating electrons, and display device

Details Device for generating electrons, and display device Device for generating electrons, and display device

1990-04-04

1994-05-24

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313446, H01J 2904

Patent

active

053152077

ABSTRACT:
A planar electron-optical lens is obtained on a semiconductor cathode surface by providing an extra electrode (16) around the gate electrode (14). Dependent on the applied voltage, this configuration operates, for example, as a positive lens which supplies parallel beams without dispersion, suitable for thin, flat display devices. A large positioning tolerance is obtained due to the inherent magnification of the beam diameter in the semiconductor device, while a grid can be dispensed with.

REFERENCES:
patent: 4574216 (1986-03-01), Hoeberechts et al.
patent: 4717855 (1988-01-01), Zwier et al.
patent: 4853585 (1989-08-01), Hoeberechts et al.
patent: 4937492 (1990-06-01), Aalders

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