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. 20, 2003
Filed:
Oct. 13, 2000
Hisanori Yamaguchi, Ishikawa-gun, JP;
Tomaoki Sekime, Kanazawa, JP;
Yoshio Iwai, Kanazawa, JP;
Tetsu Ogawa, Kanazawa, JP;
Abstract
A reflection liquid crystal display device comprising only one polarization film, wherein the twist angle of a nematic liquid crystal ranges from 0° to 90°, the relationship between the difference between the indices of birefringence &Dgr;n , the thickness of the liquid crystal layer d , and the retardation of the phase plate R is expressed by &Dgr;n .d =0.20 to 0.30 &mgr;m, R -&Dgr;n .d =−0.20 to −0.05 &mgr;m; Defining the direction in which a nematic liquid crystal is twisted toward a lower substrate when viewed from above an upper substrate as positive and letting the direction of the major axis of the liquid crystal molecule the nearest to one of the upper and lower substrates be represented by &PHgr; , the direction of the phase lagging axis of the phase plate be represented &PHgr; , and the direction of the absorbing or transmitting axis of the polarization film be represented by &PHgr; , the relationship between the directions is expressed by &PHgr; -&PHgr; =−40° to −25°, &PHgr; -&PHgr; =+50° to +80° or &PHgr; -&PHgr; =+65° to 105°, &PHgr; -&PHgr; =−60° to −90°. Therefore, bright white can be displayed and a nonchromatic high-contrast image can be also displayed.