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. 02, 2010
Filed:
Feb. 24, 2006
Norikazu Uchiyama, Chikura, JP;
Masaaki Okunaka, Fujisawa, JP;
Masahiro Nishizawa, Mobara, JP;
Hidetsugu Matsukiyo, Chiba, JP;
Yuko Matsumoto, Onjuku, JP;
Norikazu Uchiyama, Chikura, JP;
Masaaki Okunaka, Fujisawa, JP;
Masahiro Nishizawa, Mobara, JP;
Hidetsugu Matsukiyo, Chiba, JP;
Yuko Matsumoto, Onjuku, JP;
Hitachi Displays, Ltd., Chiba, JP;
Abstract
According to one aspect of the present invention, it is possible to sufficiently perform the discharging of charge without lowering the light emitting efficiency of an organic EL device and hence, the device can exhibit the light emitting efficiency higher than a conventional organic EL device and, at the same time, can prevent the degradation of the device. As an organic EL device to which the present invention is applied, on a glass transparent substrate, a transparent electrode, a hole injection layer and a hole transport layer which function as a hole transport function layer, a light emitting layer, an electron transport function layer, and a metal electrode are formed sequentially, and a drive power sources are connected to the transparent electrode and the metal electrode. Further, from the drive power source, as an applying voltage, a voltage which is obtained by overlapping any one of a sine wave, a pulse wave, a triangle wave and a sawtooth wave having two cycles or more to a drive signal or a voltage which is obtained by overlapping a sine wave having two cycles or more to the drive signal is supplied.