公开(公告)号：US06473144B1

公开(公告)日：2002-10-29

申请号：US08965047

申请日：1997-11-05

申请人： Nobuhiko Ichikawa ,  Tsuyoshi Hotta

发明人： Nobuhiko Ichikawa ,  Tsuyoshi Hotta

IPC分类号： F02F11335

CPC分类号： G02F1/133621

摘要： A liquid crystal display apparatus and liquid crystal projection display apparatus, which employ a hologram color filter, and which are designed so that the illuminating light utilization efficiency is improved to a considerable extent, and that a color image can be faithfully displayed with excellent color reproducibility without uneven color or other similar problem. A color liquid crystal display apparatus (11) has a hologram (5), which diffractively disperses incident light so as to emanate light rays in different wavelength regions at a predetermined spatial period, as a color filter, and a liquid crystal display device (6). The display apparatus (11) is illuminated by white parallel back light (3) from an illuminator (14). A displayed image which is modulated in the color liquid crystal display apparatus (11) is passed through a field lens, which is disposed in the vicinity of the display apparatus (11), and formed as an enlarged image on a screen (19) for display through a projection lens (18). A short-wavelength cut-off filter whose transmittance for a wavelength not longer than 430 nm is not higher than 5% is disposed at a position in an optical path extending from a lamp (15) to the screen (19), thereby preventing crosstalk of colors which might otherwise occur when light which should be incident on a pixel assigned to display blue undesirably enters a pixel which is adjacent to the pixel for blue, and thus making it possible to display a faithful color image.

摘要翻译： 一种液晶显示装置和液晶投影显示装置，其采用全息图彩色滤光片，其设计使得照明光利用效率得到相当大的改善，并且可以忠实地显示彩色图像，具有优异的颜色再现性 没有不均匀的颜色或其他类似的问题。 彩色液晶显示装置（11）具有全息图（5），其以预定的空间周期将不同波长区域的光线衍射的入射光衍射为散射光，作为滤色器，以及液晶显示装置（6） ）。 显示装置（11）由来自照明器（14）的白色平行背光（3）照射。 在彩色液晶显示装置（11）中调制的显示图像通过设置在显示装置（11）附近的场透镜，并在屏幕（19）上形成为放大图像，用于 通过投影透镜（18）显示。 在从灯（15）延伸到屏幕（19）的光路中的位置配置有波长不大于430nm的透射率不高于5％的短波截止滤波器，从而防止串扰 当应该入射到分配给显示蓝色的像素的光不期望地进入与蓝色的像素相邻的像素时，可能会发生的颜色，从而使得可以显示忠实的彩色图像。