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. 11, 2001
Filed:
Jul. 30, 1999
Masayuki Iida, Kagoshima, JP;
Yuji Hayashi, Kagoshima, JP;
Sony Corporation, , JP;
Abstract
When a driving circuit for a liquid-crystal display apparatus, especially a switching section and an input-voltage conversion circuit for an analog operation, is formed of circuit devices having large variations in characteristics, such as thin-film transistors, these device-characteristic variations adversely affect circuit operations, and a video-signal switching section may reduce image quality. In the input-voltage conversion circuit, circuit malfunction may occur. In an active-matrix liquid-crystal display apparatus, thin-film transistors having a gate length of 2L and a gate width of 2W are used as circuit devices constituting a driving circuit for driving pixels, especially a circuit portion handling an analog signal, where L indicates the shortest gate length determined from the dielectric strength and W indicates the gate width determined by a ratio of W/L based on the purpose of use according to the shortest gate length L.