发明名称 |
Phase retarder and process for producing the same |
摘要 |
A phase retarder and a process for producing the same are disclosed. The phase retarder is obtained by shrinking a uniaxially stretched thermoplastic high polymer film in the direction perpendicular to the stretching direction at a lengthwise shrink of at least 2%. The phase retarder has a ratio of a retardation value (R30) measured on the phase retarder being inclined at a angle of 30 degrees with respect to the orientation axis as an axis of rotation to a retardation value (R0) measured on the phase retarder being held horizontally, each measured with a polarizing microscope, (R30/R0) of not more than 1.10, and preferably not more than 1.07. A liquid crystal display fitted with the phase retarder exhibits broad viewing angle characteristics while achieving a satisfactory B/W display level.
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申请公布号 |
US5285303(A) |
申请公布日期 |
1994.02.08 |
申请号 |
US19910705203 |
申请日期 |
1991.05.24 |
申请人 |
SUMITOMO CHEMICAL CO., LTD. |
发明人 |
OKADA, TOYOKAZU;SAKAKURA, KAZUAKI;HIGASHI, KOJI;SHIMIZU, AKIKO |
分类号 |
B29C61/00;G02B5/30;G02F1/13363;(IPC1-7):G02B1/04 |
主分类号 |
B29C61/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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