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:
Oct. 13, 1998
Filed:
May. 15, 1995
Applicant:
Inventors:
Assignee:
Casio Computer Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ;
U.S. Cl.
CPC ...
438163 ; 438166 ; 438487 ;
Abstract
A thin film transistor including a thin semiconductor film which has a central portion as a channel region, with the side portions of the semiconductor film except for the channel region being a source and a drain regions which includes n-type impurities such as phosphorus ions of high concentration (3.times.10.sup.15 atoms/cm.sup.2), and a low concentration region provided between the channel region and each of the source and drain regions including p-type impurities such as boron ions of a low concentration (1.times.10.sup.13 atoms/cm.sup.2) whereby the low concentration region serves to reduce the off current.