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:
Sep. 20, 1983
Filed:
May. 11, 1981
Applicant:
Inventor:
Fumiaki Mukaiyama, Suwa, JP;
Assignee:
Kabushiki Kaisha Suwa Seikosha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
340708 ; 340784 ; 340712 ;
Abstract
A light crystal display device which includes a liquid crystal panel and a light pen. The liquid crystal panel includes a plurality of display dots defined by spaced electrodes having a twisted nematic liquid crystal therebetween. The display dots are selectively driven by a drive circuit between light-transmissive and non-transmissive states in a predetermined flickering timing. The light pen selectively directs light to the display dots which is caused to flicker thereby. The flickered light is detected by a sensor in the light pen and produces positioning data signals representative of the sequence of dots selected.