Matsushita Electric Industrial Co., Ltd.

Tomaoki Sekime

Tetsu Ogawa

Hisanori Yamaguchi

Yoshio Iwai

A reflection liquid crystal display device comprising only one polarization film, wherein the twist angle of a nematic liquid crystal ranges from 0&deg; to 90&deg;, 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 &equals;0.20 to 0.30 &mgr;m, R -&Dgr;n .d &equals;&minus;0.20 to &minus;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; &equals;&minus;40&deg; to &minus;25&deg;, &PHgr; -&PHgr; &equals;&plus;50&deg; to &plus;80&deg; or &PHgr; -&PHgr; &equals;&plus;65&deg; to 105&deg;, &PHgr; -&PHgr; &equals;&minus;60&deg; to &minus;90&deg;. Therefore, bright white can be displayed and a nonchromatic high-contrast image can be also displayed.

Growing community of inventors

Kanazawa, Japan

Tomaoki Sekime