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    • 4. 发明申请
    • Projection type display apparatus and optical unit used therefor
    • 投影式显示装置及其所用的光学装置
    • US20060274274A1
    • 2006-12-07
    • US11445465
    • 2006-06-02
    • Kei AdachiKoji HirataMasahiko Yatsu
    • Kei AdachiKoji HirataMasahiko Yatsu
    • G03B21/14
    • G02B27/149G02B27/1026G03B21/2073G03B21/208
    • The present invention provides a technique which can enhance contrast and brightness of a displayed image in a projection image display apparatus. According to the present invention, as a polarization splitting unit polarization-splitting incident light or exiting light upon/from a light valve, F number of a polarization splitting plane formed between prism members in an axial direction in which an incident angle of light is small (Y-axis direction) is smaller than F number in an axial direction in which an incident angle is large (X′-axis direction or Z′-axis direction) so that the light is incident so as to be tilted in the axial direction in which the incident angle is small. This can suppress an amount of change in incident angle of light upon a polarization splitting plane to a small value and can increase an amount of incident light upon the polarization splitting plane in the state that polarization-splitting performance is maintained in the best range.
    • 本发明提供一种能够增强投影图像显示装置中的显示图像的对比度和亮度的技术。 根据本发明,作为偏振分离单元,偏振光分离入射光或从光阀出射光,在光入射角小的轴向的棱镜构件之间形成的偏振分束平面的F数 (Y轴方向)小于入射角(X'轴方向或Z'轴方向)的轴方向的F数,使得光入射到轴向方向 其中入射角小。 由此,能够将偏振光分离面的光的入射角的变化量抑制到小的值,并且能够在极化分离性能保持最佳范围的状态下增加偏振分离面上的入射光量。