Electroluminescence Device

• US 20100051990A1
• Filed: 06/09/2009
• Published: 03/04/2010
• Est. Priority Date: 01/29/2003
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Ibe, Takahiro
• Granted Patent: US 8,207,665 B2
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths
• CPC Class Codes: H10K 59/84 Parallel electrical configurations of multiple OLEDs

Abstract

An organic EL element has excellent features as compared with other electroluminescent elements, but on the other hand, has a problem that the life of the element is not sufficiently long. In addition, since the organic EL element is expected to be applied to a mobile display and the like, it is also important to improve power efficiency. Hence, an object of the invention is to provide an element structure to realize an improvement in power efficiency and an improvement in the life of the element at the same. In the construction of an organic EL element of the invention, the first electroluminescent film 303 is sandwiched by the first anode 302 and a cathode 304, and the second electroluminescent film 305 and the second anode 306 are laminated over the cathode 304. At this time, the first anode 302 is put into contact with the second anode 306 to form a parallel circuit to decrease an electric current passing through the respective electroluminescent films.

Claims

1. An electroluminescence device characterized in having;

a first electrode formed on a substrate;

a first electroluminescent film in contact with the first electrode;

a second electrode in contact with the first electroluminescent film;

a second electroluminescent film in contact with the second electrode; and

a third electrode in contact with the second electroluminescent film, and

characterized in that the first electrode and the third electrode function as one of an anode or a cathode and the second electrode functions as the other of the anode or the cathode.

2-14. -14. (canceled)