Quarter wavelength plate and projection type video display device using same
    1.
    发明申请
    Quarter wavelength plate and projection type video display device using same 失效
    四分之一波长板和投影型视频显示装置使用相同

    公开(公告)号:US20030174290A1

    公开(公告)日:2003-09-18

    申请号:US10356294

    申请日:2003-01-31

    申请人: Hitachi, Ltd.

    IPC分类号: G03B021/00

    CPC分类号: G03B21/006

    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.

    摘要翻译: 用于减小光学各向异性晶体中的延迟值对入射光束角的依赖性的四分之一波长板。 四分之一波长板由厚度为0.1mm至0.5mm的光学各向异性晶体形成。 四分之一波长板可以有助于减小延迟值对光束照射在四分之一波长板上的角度的依赖性以及由于温度升高引起的着色减少。 使用四分之一波长板的反射型液晶显示装置可以提高亮度和对比度。

    Projection display
    2.
    发明申请
    Projection display 有权
    投影显示

    公开(公告)号:US20040080722A1

    公开(公告)日:2004-04-29

    申请号:US10651242

    申请日:2003-08-29

    申请人: HITACHI, LTD.

    IPC分类号: G03B021/14

    CPC分类号: G03B21/208 G03B21/16

    摘要: A projection display according to the present invention reduces the size of a light beam in the optical path of an illumination optics from the periphery to change the amount of light incident on a video display device and the angle of such incidence, thereby making a plurality of image brightness/contrast combinations selectable. Further, the present invention changes the revolving speed of a projection display cooling fan and the adjustment value settings for the video display device's electrical characteristics in accordance with the aperture.

    摘要翻译: 根据本发明的投影显示器从周边减小照明光学器件的光路中的光束的尺寸,以改变入射在视频显示装置上的光量和这种入射角度,从而使多个 图像亮度/对比度组合可选。 此外,本发明根据孔径改变投影显示冷却风扇的转速和视频显示装置的电特性的调整值设置。