发明名称 |
Quarter wavelength plate and projection type video display device using the same |
摘要 |
A quarter wavelength plate for reducing the dependence of a retardation value on an incident beam angle in optically anisotropic crystals. The quarter wavelength plate is formed of optically anisotropic crystals in a thickness of 0.1 mm to 0.5 mm. The quarter wavelength plate can contribute to a reduction in the dependence of the retardation value on the angle at which a light beam impinges on the quarter wavelength plate, and to a reduction in color shading caused by a rise in temperature. A reflection type liquid crystal display device which employs the quarter wavelength plate can enhance the luminance and contrast. |
申请公布号 |
US2006017888(A1) |
申请公布日期 |
2006.01.26 |
申请号 |
US20050232582 |
申请日期 |
2005.09.21 |
申请人 |
HITACHI, LTD. |
发明人 |
SHIKITA KAZUO;NAKASHIMA TSUTOMU;KIMURA NOBUYUKI |
分类号 |
G02B5/30;G03B21/00;G02F1/13363 |
主分类号 |
G02B5/30 |
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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