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:
Jun. 19, 2007
Filed:
Nov. 27, 2003
Yasuo Umezu, Kitamoto, JP;
Shotaro Kawakami, Oosato-gun, JP;
Kiyofumi Takeuchi, Tokyo, JP;
Tetsuo Kusumoto, Ageo, JP;
Shinji Ogawa, Saitama, JP;
Yasuo Umezu, Kitamoto, JP;
Shotaro Kawakami, Oosato-gun, JP;
Kiyofumi Takeuchi, Tokyo, JP;
Tetsuo Kusumoto, Ageo, JP;
Shinji Ogawa, Saitama, JP;
Dainippon Ink and Chemicals, Inc., Tokyo, JP;
Abstract
The present invention provides a nematic liquid crystal composition using a 4,6-difluoroindane-based compound that has a low lower limit temperature (T) of the liquid crystal phase, high upper limit temperature (T) of the liquid crystal phase, and wide liquid crystal phase temperature range without impairing response speed, threshold voltage and other liquid crystal characteristics within a the range of the optimal Δn as a nematic liquid crystal, and a 4,6-difluoroindane-based compound that is used in said liquid crystal composition. The nematic liquid crystal composition contains at least one type of compound having a 4,6-difluoroindan-2,5-diyl group, and the refractive index anisotropy is within the range of 0.08 to 0.15, the liquid crystal phase upper limit temperature is 70° C. or higher, the liquid crystal phase lower limit temperature is −20° C. or lower, and the difference between the liquid crystal phase upper limit temperature and liquid crystal phase lower limit temperature is 90° C. or more.