Glass filter for contrast enhancement in CRT displays

Details Glass filter for contrast enhancement in CRT displays Glass filter for contrast enhancement in CRT displays

1980-03-20

1981-09-08

Vertiz, O. R.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 79, C03C 304, C07C 308, C03C 310

Patent

active

042882508

ABSTRACT:
A green contrast enhancement filter for CRT display devices which is prepared by adding about 0.1 to 1.5 part by weight of Cr.sub.2 O.sub.3, about 0 to 0.5 part by weight of CuO and about 0 to 0.2 part by weight of NiO to 100 parts by weight of a base glass comprising about 4 to 70% by weight of SiO.sub.2, about 15 to 30% by weight of Nd.sub.2 O.sub.3, about 0 to 25% by weight of one or more alkali metal oxides (R.sub.2 O) and about 0 to 46% by weight of one or more divalent metal oxides (RO) such as MgO, CaO, SrO, BaO, ZnO and PbO, wherein the sum R.sub.2 O+RO is about 10 to 50% by weight, about 0 to 25% by weight B.sub.2 O.sub.3, about 10% by weight or less Al.sub.2 O.sub.3 and about 0 to 10% by weight each of TiO.sub.2, ZrO.sub.2, La.sub.2 O.sub.3, Nb.sub.2 O.sub.5 and Ta.sub.2 O.sub.5.

REFERENCES:
patent: 2552125 (1951-05-01), Tillyer
patent: 3364041 (1968-01-01), Swain, Jr. et al.
patent: 3915722 (1975-10-01), Schaller
patent: 3947281 (1976-03-01), Bacon

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