发明授权
- 专利标题: Polarization component, polarization light source and image display apparatus using the same
- 专利标题(中): 偏振分量,偏振光源和使用其的图像显示装置
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申请号: US12781398申请日: 2010-05-17
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公开(公告)号: US07982952B2公开(公告)日: 2011-07-19
- 发明人: Kazutaka Hara , Minoru Miyatake
- 申请人: Kazutaka Hara , Minoru Miyatake
- 申请人地址: JP Ibaraki-shi, Osaka
- 专利权人: Nitto Denko Corporation
- 当前专利权人: Nitto Denko Corporation
- 当前专利权人地址: JP Ibaraki-shi, Osaka
- 代理机构: Westerman, Hattori, Daniels & Adrian, LLP
- 优先权: JP2002-121129 20020423; JP2002-128904 20020430
- 主分类号: G02B5/30
- IPC分类号: G02B5/30
摘要:
A polarization component, capable of efficiently reflecting an obliquely transmitted light beam toward a light source without degrading the transmission-polarization property of a perpendicular incident light beam, is provided. A C-plate having an oblique retardation of at least λ/8 with respect to a light beam inclined by at least 30° is disposed between at least two reflective circular polarizer layers whose selective reflection wavelength bands of polarized light overlapping each other. A combination of a reflective linear polarizer and a quarter wavelength plate may be used instead of the reflective circular polarizer. Alternatively, a combination of two reflective linear polarizer layers and two quarter wavelength plate layers (Nz≧2) disposed therebetween can provide a similar effect. Further, a combination of two reflective linear polarizer layers and a half wavelength plate (Nz≧1.5) disposed therebetween may be used. When reflective linear polarizer layers are used, they must be bonded together with their axial directions set at a certain angle. The polarization component is preferably used in various image display apparatuses such as liquid crystal display apparatuses and organic EL display apparatuses.