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:
Aug. 30, 1994
Filed:
Jun. 25, 1993
Takashi Arakawa, Nagoya, JP;
Hiroyuki Motegi, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A plurality of resistors serially connected with each other between a maximum voltage level 'V' and a minimum voltage level '0' are provided to generate voltage-divided intermediate voltage levels 'V2H', 'V1H', 'V3L', 'V2L', the voltages having the voltage-divided intermediate voltage levels being supplied to a first group of operational amplifiers whose first stage input portions are formed of N-channel MOSFETs and a second group of operational amplifiers whose first stage input portions are formed of P-channel MOSFETs. Frame signal FR for alternating-current-driving a liquid crystal display device is supplied to the operational amplifiers. When signal FR is in a state '0', the first group of operational amplifiers are brought into an active state while the second group is brought into an inactive state. When signal FR is in a state '1', the first group of operational amplifiers are inactive. Under the condition that power down signal PD for non-use of the liquid crystal display device is generated, all of the operational amplifiers are controlled to be in an inactive state.