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. 26, 1991
Filed:
Aug. 26, 1988
Applicant:
Inventor:
Yasumoto Shimizu, Tokyo, JP;
Assignee:
Hoya Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ; H05B / ;
U.S. Cl.
CPC ...
313509 ; 313114 ; 313512 ; 427 66 ;
Abstract
In an EL element of this invention, a thin film layer is formed between a transparent substrate and a layer formed adjacent to the transparent substrate, and the refractive index of the thin film layer is changed to be approximated to those of these layers toward the interfaces between the thin film layer and the corresponding layers, so that a difference in refractive index at these interfaces is minimized. The thin film layer may be formed between at least two adjacent layers formed on the transparent substrate.