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1. 发明授权

US4127322A High brightness full color image light valve projection system 失效
公开(公告)号：US4127322A
公开(公告)日：1978-11-28
申请号：US637906
申请日：1975-12-05
申请人： Alexander D. Jacobson , Jan Grinberg , Donald E. Sprotbery , Donald D. Boswell
发明人： Alexander D. Jacobson , Jan Grinberg , Donald E. Sprotbery , Donald D. Boswell
IPC分类号： H04N9/31 , H01J29/89 , G02F1/01 , G03B21/00
CPC分类号： H04N9/3105
摘要： There is disclosed an electro-optical system for real time projection of very high brightness, full color pictorial images from television or other program sources onto a large display screen from a set of three reflection type AC driven field effect mode birefringent liquid crystal light valves each of which modulates a primary color component video image onto a collimated beam of polarized light of a given primary color by modulating the polarization state thereof. In order to achieve very high brightness without overheating the system it is necessary that none of the optical elements forming the projection beam optical system absorb light in carrying out their function. Hence all projection beam optical processes are non-absorptive to first order. The light valves are devices that receive and reflect projection light from an independent high power light source while modulating onto the reflected light video images derived from a low level light source such as a cathode ray tube. The modulation onto the projection beam is achieved by modulating the state of polarization thereof. One such device is used for the red portion of the video image, a second for the green portion and a third for the blue portion. The optical system derives light from a white projection light source, polarizes it, splits it into the three primary colors, directs the three colored beams to the three light valves respectively for image modulation, collects the light that has been modulated by the light valves, recombines the three beams, and projects them onto the screen with sufficient registration to create full color range for the full color image. The optical system uses only a single projection lens and a single polarizing/analyzing beam splitter/recombiner and suitable dichroic mirrors. There is thus provided a simple, compact low weight, high brightness and high efficiency full color light valve image projection system for the projection of high brightness, full color, real time dynamic or static imagery which may include provision for overlay legends or other information as well as possible steroscopic or three dimensional perception by the viewer.

2. 发明授权

US5465174A Single light valve full-color projector display 失效
标题翻译：单光阀全彩投影机显示
公开(公告)号：US5465174A
公开(公告)日：1995-11-07
申请号：US216773
申请日：1994-03-23
申请人： Donald E. Sprotbery
发明人： Donald E. Sprotbery
IPC分类号： G02F1/13 , G02F1/135 , G03B21/00 , G09G3/18 , H04N5/74 , H04N9/31 , G02F1/133
CPC分类号： H04N9/3108 , H04N9/312 , H04N9/3129 , H04N9/3161 , H04N9/3164
摘要： A single light valve full-color projector 10 operative to display an image on a screen 12 in response to first and second video signals. The inventive projector 10 includes a laser 22 for providing a beam of coherent light. A scanning control circuit 20 coupled to the laser 22 varies the intensity of the beam on the basis of information inherent in the first and second video signals. The inventive projector 10 further includes a liquid crystal light valve 26 which modulates light illuminating an output layer 44 thereof in accordance with an internally generated voltage pattern produced by incidence of the modulated beam on an input layer 40 thereof. A raster scanner 24 is operative to deflect the beam to a first set of areas on the input layer 40 in response to the first video signal and to deflect the beam to a second set of areas on the input layer in response to the second video signal. The projector display 10 of the present invention further includes a polarizing beam splitter 46 positioned in an optical path between the output layer 44 and an external light source 42 for polarizing and directing the light from the external source 42 onto the light valve output layer 44 and for relaying modulated light reflected by the output layer 44 to an image plane P. A striped filter arrangement 18 having first and second sets of filter elements in optical alignment with the first and second sets of areas of the input layer 40 transmits radiant energy in first and second wavelength bands, respectively, to the display screen 12.
摘要翻译：单个光阀全色投影仪10，用于响应于第一和第二视频信号，在屏幕12上显示图像。本发明的投影仪10包括用于提供相干光束的激光器22。耦合到激光器22的扫描控制电路20基于第一和第二视频信号中固有的信息改变光束的强度。本发明的投影仪10还包括液晶光阀26，该液晶光阀26根据调制束入射在其输入层40上产生的内部产生的电压图来调制照射其输出层44的光。光栅扫描器24可操作以响应于第一视频信号将光束偏转到输入层40上的第一组区域，并且响应于第二视频信号将光束偏转到输入层上的第二组区域。本发明的投影仪显示器10还包括位于输出层44和外部光源42之间的光路中的偏振分束器46，用于将来自外部源42的光偏振并引导到光阀输出层44上，用于将由输出层44反射的调制光中继到图像平面P.具有与输入层40的第一和第二组区域光学对准的第一组和第二组滤波器元件的条形滤波器装置18首先传输辐射能和第二波长带分别提供给显示屏12。

3. 发明授权

US5907437A Converging optics for a single light valve full-color projector 失效
标题翻译：单光阀全彩投影机的聚光光学元件
公开(公告)号：US5907437A
公开(公告)日：1999-05-25
申请号：US891393
申请日：1997-07-10
申请人： Donald E. Sprotbery , Arno G. Ledebuhr
发明人： Donald E. Sprotbery , Arno G. Ledebuhr
IPC分类号： G02B13/16 , H04N9/31 , G02B27/10 , G02B3/00
CPC分类号： H04N9/3108 , G02B13/16 , H04N9/317 , H04N9/3194
摘要： A light valve image projection system (10) wherein the optical registration of individual primary color images on a projection screen (14) is substantially immune to modification of the projection throw distance is disclosed herein. The inventive light valve projection system (10) is operative to project a composite optical image onto the screen (14), and includes an optical light valve apparatus (18, 19, 20) for generating first and second optical images. A converging optical system (22), in optical alignment with one or more light valves (20), is disposed to overlap the first and second images into a composite image along an optical axis. The projection system (10) of the present invention further includes a projection lens (24) for illuminating the screen (14) with the composite image.
摘要翻译：本文公开了一种光阀图像投影系统（10），其中在投影屏幕（14）上的各个原色图像的光学配准基本上不受投影投射距离的修改的影响。本发明的光阀投影系统（10）可操作以将复合光学图像投影到屏幕（14）上，并且包括用于产生第一和第二光学图像的光学阀装置（18,19,20）。设置与一个或多个光阀（20）光学对准的会聚光学系统（22），以将第一和第二图像重叠成沿着光轴的合成图像。本发明的投影系统（10）还包括用合成图像照亮屏幕（14）的投影透镜（24）。

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