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:
Sep. 26, 1989
Filed:
Apr. 15, 1986
Takeo Matsudaira, Tokyo, JP;
Yasumoto Shimizu, Tokyo, JP;
Hoya Corporation, Tokyo, JP;
Abstract
In an electroluminescent panel comprising a transparent electrode, a back electrode, and an electroluminescent layer between the transparent and the back electrodes, an intermediate layer is interposed between the electroluminescent layer and the back electrode and essentially consists of germanium and nitrogen. The intermediate layer serves as a light absorption layer for absorbing ambient light. A nitrogen distribution in the intermediate layer may be either substantially uniform or decreased from the electroluminescent layer side towards the back electrode side. The decrease may be made stepwise or continuously. The intermediate layer may be superposed through a dielectric layer or directly on the electroluminescent layer. Only oxygen may be added in intermediate layer to the germanium and the nitrogen, to provide either a substantially uniform oxygen distribution or a variable oxygen distribution which is continuously or stepwise decreased from the electroluminescent layer side towards the back electrode side.