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. 03, 1976
Filed:
Aug. 08, 1974
Minoru Fujita, Kodaira, JA;
Hitachi, Ltd., , JA;
Abstract
A multi-level voltage supply for liquid crystal display devices employs complementary metal-oxide-semiconductor field-effect transistors. The supply circuit proper includes a p type and an n type MOSFET which are connected in series with each other. A plurality of n-type MOSFETs are grouped together in pairs with their source and gate electrodes connected together and being connected in parallel with the first-mentioned n-type MOSFET. A plurality of voltage levels are applied to the circuit, the lowest of which is applied to the first-mentioned n-type MOSFET. Intermediate voltage levels are applied to the plural parts of n-type MOSFETs. Multi-level voltages for driving the liquid crystal display devices are provided at the connection point of the P-type MOSFET and the N-type MOSFETs of the plurality. As a result, it is possible to prevent the flow of a D.C. current between the lowest level voltage source and the intermediate level voltage source.