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:
May. 14, 1996
Filed:
Aug. 02, 1994
Shuichi Inoue, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A contrast adjustment circuit for a liquid crystal display which is connected, when to be used, to an electronic apparatus such as a computer. The contrast adjustment circuit comprises an adjustment voltage supply circuit provided in an electronic apparatus, a reference voltage generation circuit provided in the liquid crystal display for generating a reference voltage substantially equal in absolute value to a contrast peak voltage of the liquid crystal display, and an operational amplifier for comparing the reference voltage and an adjustment voltage and supplying a voltage difference between the reference voltage and the adjustment voltage to a driving voltage input terminal of the liquid crystal display.