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. 23, 1997
Filed:
Apr. 12, 1995
Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken, JP;
Abstract
An electronic device utilizing a material having: a photoconductive effect; a trap level for trapping an excited carrier; and an energy band gap, the device comprising: a means for illuminating the material with a first light, the first light having a wavelength corresponding to an energy higher than the energy band gap of the material; a means for illuminating the material with a second light, the second light having a wavelength corresponding to an energy lower than the energy band gap of the material; a means for measuring the quantity of second light transmitted through the material; and a means for obtaining information on the first light illuminated to the material from the quantity of the transmitted second light.