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:
Dec. 07, 2004
Filed:
Feb. 26, 2001
Yasuo Imanishi, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
According to the conventional technique, light discharge efficiency was improved by orientation in the direction vertical to the device plane. However, a big reflection loss was caused by increased anisotropy in the refractive index of the light emitting layer, and the discharge efficiency could not be improved as expected. Further, characteristics related to the angle of field were deteriorated by excessive directivity. To avoid problem, the molecular orientation is adjusted according to a design guideline to ensure that the transition dipole moment of the light emitting material used has the optimum direction, and an intermediate layer is provided to adjust the refractive index and to obtain the optimum directivity.