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. 24, 1996
Filed:
Nov. 09, 1994
Takahiro Nakayama, Hitachi, JP;
Atsushi Kakuta, Hitachiota, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A resonance type variable wavelength luminescent device which can control a spectrum of emission light of luminescent elements in response to an input signal such as voltage, heat, pressure, sound wave, magnetic field, electric field, gravity, electromagnetic wave or the like. Sequentially formed as laminated on a glass substrate are a semi-transparent reflective film, first electrically conductive transparent electrode films, a variable optical length layer, second electrically conductive transparent electrode films, a hole injection layer, an active layer made of aluminum chelate or the like and metallic electrodes, so that the first and second electrically conductive transparent electrode films are mutually arranged in a matrix form. A voltage is applied between the second electrically conductive transparent electrode films and the metallic electrodes to cause light emission of the active layer, whereas a voltage is applied between the first and second electrically conductive transparent electrode films to control the optical length of the variable optical length layer and to control a spectrum of emission light of the device. The variable wavelength luminescent device can be applied to planar color displays, optical switches and various sorts of sensors.