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    • 2. 发明授权
    • Display apparatus
    • 显示装置
    • US5208620A
    • 1993-05-04
    • US718908
    • 1991-06-24
    • Hideaki MitsutakeNobuo MinouraKatsumi KurematsuHaruyuki Yanagi
    • Hideaki MitsutakeNobuo MinouraKatsumi KurematsuHaruyuki Yanagi
    • G03B21/10H04N5/74
    • H04N5/7408G03B21/10
    • A display apparatus comprises a projecting device for projecting an image, with the projecting device having a projection optical system having a limited pupil diameter and screen device arranged at a position where an image is substantially projected by the projecting device. The screen device has at least two sheets in each of which a number of prisms extending like a straight line or a curve are formed on the surface on the side opposite to the projecting device. Each of the prisms has an effective portion for allowing a light flux from the projecting device to be emitted in a predetermined direction and a non-effective portion which does not contribute to the emission of the light flux in the predetermined direction, and wherein the non-effective portions of another one or a plurality of the other sheets among the plurality of sheets excluding the sheet arranged at the nearest position on the projecting device side are formed so as to have an almost intermediate angle between the angle of a principal ray when a light flux from the projecting device progresses in the sheets and the emission angle of the principal ray when it is emitted from effective surfaces of the prisms of the sheets.
    • 显示装置包括用于投影图像的投影装置,其中投影装置具有具有有限瞳孔直径的投影光学系统和布置在图像基本上由投影装置投影的位置处的屏幕装置。 屏幕装置具有至少两个片材,每个片材在与投影装置相对的一侧上的表面上形成有直线或曲线延伸的多个棱镜。 每个棱镜具有用于允许来自投影装置的光束沿预定方向发射的有效部分和对预定方向上的光束的发射无贡献的非有效部分,并且其中, 除了布置在突出装置侧的最靠近的位置的纸张之外的多个纸张中的另一个或多个其他纸张的有效部分被形成为具有当主要光线的角度之间几乎中间的角度 当从片材的棱镜的有效表面发射时,来自投影装置的光通量在片材中进行并且主光线的发射角度发生。