| US 7,468,777 B2 | ||
| Method of producing elliptically polarizing plate and image display using the elliptically polarizing plate | ||
| Ikuo Kawamoto, Ibaraki (Japan); Seiji Umemoto, Ibaraki (Japan); Takashi Kamijou, Ibaraki (Japan); Hideyuki Yonezawa, Ibaraki (Japan); and Kazuya Hada, Ibaraki (Japan) | ||
| Assigned to Nitto Denko Corporation, Ibaraki-shi, Osaka (Japan) | ||
| Filed on Feb. 15, 2006, as Appl. No. 11/354,130. | ||
| Claims priority of application No. 2005-051348 (JP), filed on Feb. 25, 2005; and application No. 2005-303840 (JP), filed on Oct. 19, 2005. | ||
| Prior Publication US 2006/0203159 A1, Sep. 14, 2006 | ||
| Int. Cl. G02F 1/13 (2006.01); G02F 1/1335 (2006.01) | ||
| U.S. Cl. 349—187 [349/87; 349/96; 349/117; 349/128; 349/129; 349/191] | 26 Claims |
| 1. A method of producing an elliptically polarizing plate, comprising the steps of:
forming a first birefringent layer on a surface of a transparent protective film (T);
laminating a polarizer on a surface of the transparent protective film (T);
laminating a polymer film on a surface of the first birefringent layer, so as to form a second birefringent layer; and
forming a third birefringent layer having a refractive index profile of nz>nx=ny on a surface of the second birefringent layer,
wherein the first birefringent layer is arranged on the opposite side against the polarizer with respect to the transparent
protective film (T), and
wherein the step of forming the first birefringent layer comprises the steps of: applying an application liquid containing
a liquid crystal material onto a substrate subjected to an alignment treatment; treating the applied liquid crystal material
at a temperature at which the liquid crystal material exhibits a liquid crystal phase, so as to form the first birefringent
layer on the substrate; and transferring the first birefringent layer formed on the substrate onto a surface of the transparent
protective film (T).
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