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. 13, 1989
Filed:
Jan. 06, 1988
Katuyuki Hunahata, Hitachi, JP;
Yoshiharu Nagae, Hitachi, JP;
Masahiro Takasaka, Hitachioota, JP;
Yuji Mori, Hitachi, JP;
Minoru Hoshino, Hitachi, JP;
Yasuyuki Kozima, Hitachi, JP;
Youhei Saito, Katsuta, JP;
Kyohei Fukuda, Fujisawa, JP;
Hayao Kozai, Mobara, JP;
Tadahiko Hasimoto, Katsuta, JP;
Yoshiaki Tsuchihashi, Kodaira, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The disclosure relates to a projector having an arrangement of polarizers and liquid crystal cells aligned on the axis of light in the order a first color polarizer colored in red, a first twisted nematic liquid crystal cell, a second twisted nematic liquid crystal cell, a second color polarizer colored in a green, a third twisted nematic liquid, a neutral polarizer and Guest-Host type colored in blue. Since, according to this, a polarizer having inferior color characteristics can be replaced by a Guest-Host type liquid crystal cell, the excitation purity and the scope of color reproduction are improved. Further, since the mixture of color is additive, the brightness of the reproduced color is also much improved.