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    • 3. 发明公开
    • Projection screen
    • 投影屏幕
    • EP1136874A1
    • 2001-09-26
    • EP00302315.7
    • 2000-03-22
    • Hewlett-Packard Company, A Delaware Corporation
    • Hunter, Andrew ArthurRudin, John Christopher
    • G03B21/56G02F1/135G02F1/1334
    • G03B21/56G02F1/1334G02F1/135
    • A screen for reflecting a projected image, in particular to an active screen for reflecting a projected image having improved contrast, and a projection system incorporating such a screen, are provided.
      The projection screen (16) for displaying an image (18), comprises an active layer (24) whose optical properties in the visible region of the spectrum can be changed under the influence of an electric field; a first electrode (28) and a second electrode (26) for applying an electric field across the active layer (24), wherein at least one electrode is transparent to allow light incident on the screen (16) to reach the active layer (24); and a photosensitive material (30) whose electrical or dielectric properties can be changed under illumination, wherein the photosensitive material (30) is arranged such that the electric field across a localised region of the active layer (24) is dependent on the illumination incident on the photoconductor in that region, with the result that the optical properties of the projection screen (16) at a point are dependent on the intensity of light incident upon the screen (16) at that point.
    • 提供了用于反射投影图像的屏幕,特别是用于反射具有改善的对比度的投影图像的活动屏幕以及包含这种屏幕的投影系统。 用于显示图像(18)的投影屏幕(16)包括活性层(24),活性层(24)在光谱的可见区域中的光学性质可以在电场的影响下改变; 用于跨有源层(24)施加电场的第一电极(28)和第二电极(26),其中至少一个电极是透明的,以允许入射到屏幕(16)上的光到达有源层(24) ); 和感光材料(30),其光电特性或介电特性可在照明下改变,其中感光材料(30)被布置为使得穿过活性层(24)的局部区域的电场取决于入射到 该区域中的光电导体,结果是投影屏幕(16)在某一点处的光学特性取决于在该点处入射到屏幕(16)上的光的强度。