CRT having internal neutral density filter field of use

Details CRT having internal neutral density filter field of use CRT having internal neutral density filter field of use

2005-11-01

2005-11-01

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Screen

C313S473000, C313S47700R, C313S474000, C313S112000

Reexamination Certificate

active

06960873

ABSTRACT:
A novel CRT and method of making the CRT are disclosed. The CRT comprises an internal neutral density filter that lies between the phosphor deposits and the interior surface of the faceplate panel. The filter enhances the contrast of the CRT without compromising center to edge brightness ratio of the CRT. The filter comprises very fine particles, wherein the particles are black, gray, or a mixture of black and gray. The filter reduces the absorption of the faceplate by 25 to 75%. The invention is particularly useful for substantially flat CRTs. The method of producing the novel CRT comprises the steps of preparing a suspension of well-dispersed light-absorbing, carbon-containing particles which are 0.05 to 2 microns in aqueous media and applying the suspension onto the interior surface of the faceplate panel prior to applying at least one phosphor deposit. The suspension may also include suitable organic and inorganic binders and dispersing and wetting agents.

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patent: 5627429 (1997-05-01), Iwasaki
patent: 5760540 (1998-06-01), Duistermaat

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