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:
Apr. 01, 2003
Filed:
Feb. 04, 2000
Koji Tanabe, Katano, JP;
Yosuke Chikahisa, Katano, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An EL lamp for emitting light in multiple color which includes a first light-permeable electrode layer formed at the back side of a transparent substrate, a first luminous material layer containing a first luminous material, an intermediate light-permeable electrode layer, a second luminous material layer containing a second luminous material, a back electrode, and at least two elements of (i) a first color material contained in the first luminous material layer, (ii) a second color material contained in the second luminous material layer, and (iii) luminous color converting layer containing a third color material, disposed between the first luminous material layer and second luminous material layer, and a color coat layer containing a fourth color material, disposed at the front surface side of the transparent substrate. The color material closer to the back electrode of the at least two elements has the color of longer wavelength than the remoter color material.