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:
Mar. 15, 1983
Filed:
Jun. 09, 1980
Shunji Banda, Suwa, JP;
Kabushiki Kaisha Suwa Seikosha, Tokyo, JP;
Abstract
A two-layer twisted nematic type liquid crystal display device for providing improved contrast is provided. The interior surfaces of the transparent electrode plates of the cells have been treated so that the long axes of the liuqid crystal molecules adjacent the plates are aligned with the treated direction of the plates. The plates are disposed with the treated directions of opposed surfaces at 90.degree. angles to each other with the treated direction on the intermediate electrode surfaces of each cell being coincidental. Characters of the transparent electrodes are formed on the interior surfaces for forming displays having a reference direction from the upper or 12 o'clock position to the lower or 6 o'clock position. An upper and lower polarization plate having axes of polarization substantially parallel to each other are disposed on the outer surfaces of the device. Improved contrast is obtained in both the upper and lower displays when the device is viewed between the four-thirty and seven-thirty directions.