Color cathode ray tube with selective light absorption film

Details Color cathode ray tube with selective light absorption film Color cathode ray tube with selective light absorption film

1993-03-05

1994-05-24

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Envelope

313313, 313468, 313112, 313479, 348834, 348835, H01J 2988

Patent

active

053152093

ABSTRACT:
A color cathode ray tube includes a face plate, and a selective light absorption film formed on the external surface of the face plate to improve the emission tint, the film having a predetermined characteristic of spectral transmittance. The selective light absorption film is formed of a coating material which consists of a base coating including an alcoholic solution of silicon alkoxide having --OH group or --OR group, and an organic or inorganic dye or pigment mixed into the base coating. Such a coating material is applied onto the external surface of the face plate to form the selective light absorption film. The selective light absorption film has main and auxiliary absorbing bands. If the fluorescent face of the face plate includes a blue fluorescent element of ZnS:Ag, a green fluorescent element of ZnS:Au, Cu and Al and a red fluorescent element of Y.sub.2 O.sub.2 S:Eu, the selection is made that the absorption peak of the main absorbing band has a wavelength equal to 580 nm and the absorption peak of the auxiliary absorbing band has a wavelength equal to 660 nm.

REFERENCES:
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patent: 4728856 (1988-03-01), Iwasaki et al.
patent: 4769347 (1988-09-01), Cook et al.
patent: 4831307 (1989-05-01), Takenaka et al.
patent: 4900984 (1990-02-01), Itou et al.
patent: 4958148 (1990-09-01), Olson
patent: 4987338 (1991-01-01), Itou et al.

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