VDT screen

Details VDT screen VDT screen

1987-06-10

1989-09-05

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Envelope

358252, 358253, H04N 565, H01J 2989

Patent

active

048641901

ABSTRACT:
The invention provides a structure for reducing potentially harmful effects emanating from a video display terminal having a screen on a cathode ray tube. The structure includes a light-transparent first medium proportioned to cover the screen and being of a material capable of absorbing ionizing radiation. An electrically conductive second medium is also proportioned to cover the screen and is sufficiently light transparent to permit normal viewing of visual displays on the screen. The second medium reacts with non-ionizing radiation to dissipate this radiation and a frame is provided to hold the first and second mediums. The frame includes a discharge connection for coupling the second medium to ground to dissipate a charge in use in the second medium.

REFERENCES:
patent: 3431454 (1969-03-01), Sanders
patent: 4404615 (1983-09-01), Dep
patent: 4412255 (1983-10-01), Kuhlman et al.
patent: 4504867 (1985-03-01), Keller
patent: 4586106 (1986-04-01), Frazier
patent: 4602310 (1986-07-01), Fenster
patent: 4633324 (1986-12-01), Giulie
patent: 4692809 (1987-09-01), Beining et al.

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