Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1987-09-04
1989-09-26
Swisher, Nancy A. B.
Stock material or miscellaneous articles
Composite
Of inorganic material
428917, 313503, 313509, H05B 3300, H05B 3310, H05B 3314
Patent
active
048699730
ABSTRACT:
In a thin film EL display device wherein a transparent electrode, a first dielectric layer, an EL emission layer, a second dielectric layer and a back electrode are laminated in order on a transluscent substrate, a 10 nm-200 nm thickness of thin film made of calcium sulfide or a mixture containing calcium sulfide which is formed by an electron beam vapor deposition method provided between the first dielectric layer and the EL emission layer and between the EL emission layer and the second dielectric layer, thereby obtaining a thin film EL display device which maintains a stable operation for a long period even when it is driven by A.C. pulses which are a symmetric with respect to the time relationship of the driving pulses (e.g., the time period between the start of a positive pulse and the start of the subsequent negative pulse is different than the time period between the start of a negative pulse and the start of the subsequent positive pulse) or are different in amplitude in a positive side and a negative side.
REFERENCES:
patent: 3854070 (1974-12-01), Vlasenko et al.
patent: 4365184 (1982-12-01), Higton et al.
patent: 4442377 (1984-04-01), Higton et al.
patent: 4717858 (1988-01-01), Tanaka et al.
patent: 4720436 (1988-01-01), Ohseto et al.
patent: 4727004 (1988-02-01), Tanaka et al.
Abe Atsushi
Fujita Yosuke
Kuwata Jun
Matsuoka Tomizo
Nishikawa Masahiro
Matsushita Electric - Industrial Co., Ltd.
Swisher Nancy A. B.
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