The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 24, 1992
Filed:
Nov. 07, 1988
Kazuo Taguchi, Tokyo, JP;
Kenichi Onisawa, Ibaraki, JP;
Moriaki Fuyama, Ibaraki, JP;
Katsumi Tamura, Ibaraki, JP;
Yoshio Abe, Ibaraki, JP;
Takahiro Nakayama, Ibaraki, JP;
Kenichi Hashimoto, Ibaraki, JP;
Akira Sato, Ibaraki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A thin film electroluminescent (EL) device comprises a pair of opposing electrodes formed on a substrate of a transparent electrical insulator, and an EL layer formed between the electrodes and covered at both surfaces with insulating layers respectively. Strontium sulfide is used as a host material of the EL layer, and its crystals tend strongly to have a (200) orientation, so that the resistance to free transit of electrons participating in emission of luminescence is substantially eliminated to ensure a higher brightness.