Three tube color projection television system having at least on

Details Three tube color projection television system having at least on Three tube color projection television system having at least on

1990-05-21

1992-03-24

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 64, 358237, 358 74, 313474, H04N 931

Patent

active

050993186

ABSTRACT:
A projection television system having three cathode ray tubes one of which has a display window, a fluorescent material layer disposed on the innermost surface of the display window, and a multilayered interference filter disposed between the display window and the fluorescent material layer. The multilayer interference filter is composed of a number of alternate layers of high refractive index material and low refractive index material. At most, two of the cathode ray tubes have only the display window and the fluorescent material layer. Images are thereafter produced with high brightness wherein respective supplied beam currents are increased by an amount to compensate for a drop in luminance intensity caused by filter removal. The brightness attained is equal to that of a conventional projection system which includes cathode ray tubes which each utilize multilayer interference filters.

REFERENCES:
patent: 4634926 (1987-01-01), Vriens et al.
patent: 4642695 (1987-02-01), Iwasaki
patent: 4683398 (1987-07-01), Vriens et al.
patent: 4804884 (1989-02-01), Vriens et al.
patent: 4807014 (1989-02-01), Van Gorkum
patent: 4882617 (1989-11-01), Vriens
patent: 4914510 (1990-04-01), Brennesholtz
patent: 4914511 (1990-04-01), Brennesholtz
patent: 4937661 (1990-06-01), Van Der Voort

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