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    • 6. 发明授权
    • Image display apparatus of liquid crystal valve projection type
    • 液晶阀投影型图像显示装置
    • US4389096A
    • 1983-06-21
    • US237471
    • 1981-02-23
    • Yoshikazu HoriKomei AsaiMasakazu Fukai
    • Yoshikazu HoriKomei AsaiMasakazu Fukai
    • G02F1/1335G02F1/29H04N9/31G02F1/13
    • H04N9/3114G02F1/1335G02F1/292G02F2203/22
    • A liquid crystal light valve projection type image display apparatus comprises an electro-optic element and a Schlieren optical system. The electro-optic element has a liquid crystal layer having a dielectric and optical anisotropy. An electric field having a spatial intensity distribution according to an image signal is applied to said liquid crystal at a spatial period, so that a spatially phase-modulated phase diffraction grating is formed in the liquid crystal layer. Thus, a projected image in enlarged form is obtained. The fact that the electric field with a spatial period is applied to the liquid crystal leads to a constant light diffraction angle, and the modulation of the diffraction light intensity in the applied electric field enables an image corresponding to the input image signal to be projected at high light utilization.
    • 液晶光阀投影型图像显示装置包括电光元件和施利伦光学系统。 电光元件具有电介质和光学各向异性的液晶层。 具有根据图像信号的空间强度分布的电场以空间周期施加到所述液晶,使得在液晶层中形成空间相位调制的相位衍射光栅。 因此,获得放大的投影图像。 将具有空间周期的电场施加到液晶的事实导致恒定的光衍射角,并且所施加的电场中的衍射光强度的调制使得能够将对应于输入图像信号的图像投影在 光利用率高。