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:
Feb. 24, 2004
Filed:
Oct. 30, 2000
Masahiko Tsuchiya, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A power supply circuit for generating potentials used to drive a liquid crystal, has first to fourth switches ( to ) connected in series between a high potential line ( ) and a low potential line ( ). The first to fourth switches are turned on and off by a switch drive circuit ( ) so that the period of time in which the first and third switches are on and the period of time in which the second and fourth switches are on alternate. The power'supply circuit also has the first to third capacitors ( to ) of which the state of connection is switched alternately between serial and parallel by the switching operation of the switches. The potential between the second and third switches converges the middle potential between the potentials of the high and low potential lines by the alternate switching between series and parallel connections of the third capacitor ( ) to the first and second capacitors ( ).