公开(公告)号：US20060103810A1

公开(公告)日：2006-05-18

申请号：US10987528

申请日：2004-11-12

申请人： Jiaying Ma ,  David Aastuen ,  Charles Bruzzone ,  William Merrill ,  Timothy Hebrink ,  Harry Johnson ,  Fuming Li

发明人： Jiaying Ma ,  David Aastuen ,  Charles Bruzzone ,  William Merrill ,  Timothy Hebrink ,  Harry Johnson ,  Fuming Li

IPC分类号： G03B21/14

CPC分类号： G02B27/145 ,  G02B27/1026 ,  G02B27/1073 ,  H04N9/3105 ,  H04N9/315

摘要： A projection engine uses a first polarizing beam splitter (PBS) that substantially reflects light incident along a first input direction in a first polarization state and substantially transmits light incident in the first input direction in a second polarization state orthogonal to the first polarization state. The first PBS demonstrates an angularly dependent reflectivity for light in the second polarization state that is asymmetric about the first input direction. At least two imager devices are positioned to receive light reflected and transmitted by the first PBS respectively. The imager devices modulate the incident light with an image. The image light from the imagers is combined and projected.

摘要翻译： 投影引擎使用第一偏振分束器（PBS），该第一偏振分束器（PBS）基本上反射沿第一输入方向入射的光以第一偏振状态，并以与第一偏振状态正交的第二偏振状态基本上透射沿第一输入方向入射的光。 第一PBS显示出在第二极化状态下对于第一输入方向不对称的光的角度依赖的反射率。 定位至少两个成像器件以接收由第一PBS反射和透射的光。 成像仪设备用图像调制入射光。 来自成像器的图像光被组合和投影。

公开(公告)号：US20060098284A1

公开(公告)日：2006-05-11

申请号：US11315721

申请日：2005-12-22

申请人： David Aastuen ,  Charles Bruzzone

发明人： David Aastuen ,  Charles Bruzzone

IPC分类号： G02B27/28

CPC分类号： H04N9/3105 ,  G02B5/305 ,  G02B5/3058 ,  G02B27/1026 ,  G02B27/145 ,  G02B27/283 ,  H04N9/3167

摘要： An optical imaging system including an illumination system, a Cartesian PBS, and a prism assembly. The illumination system provides a beam of light, the illumination system having an f/# less than or equal to 2.5. The Cartesian polarizing beam splitter has a first tilt axis, oriented to receive the beam of light. A first polarized beam of light having one polarization direction is folded by the Cartesian polarizing beam splitter and a second polarized beam of light having a second polarization direction is transmitted by the Cartesian polarizing beam splitter. The Cartesian polarizing beam splitter nominally polarizes the beam of light with respect to the Cartesian beam splitter to yield the first polarized beam in the first polarization direction. The color separation and recombination prism is optically aligned to receive the first polarized beam. The prism has a second tilt axis, a plurality of color separating surfaces, and a plurality of exit surfaces. The second tilt axis may be oriented perpendicularly to the first tilt axis of the Cartesian polarizing beam splitter so that the polarized beam is nominally polarization rotated into the second polarization direction with respect to the color separating surfaces and a respective beam of colored light exits through each of the exit surfaces. Each imager is placed at one of the exit surface of the color separating and recombining prism to receive one of the respective beams of colored light, wherein each imager can separately modulate the polarization state of the beam of colored light.

摘要翻译： 包括照明系统，笛卡尔PBS和棱镜组件的光学成像系统。 照明系统提供光束，照明系统具有小于或等于2.5的f /＃。 笛卡尔偏振分束器具有第一倾斜轴，其被定向成接收光束。 具有一个偏振方向的第一偏振光束由笛卡尔偏振分束器折叠，并且具有第二偏振方向的第二偏振光束由笛卡尔偏振分束器传输。 笛卡尔偏振光束分离器通常相对于笛卡尔分光镜使光束偏振，以产生第一偏振方向上的第一偏振光束。 色分离和复合棱镜被光学对准以接收第一偏振光束。 棱镜具有第二倾斜轴，多个颜色分离表面和多个出射表面。 第二倾斜轴可以垂直于笛卡尔偏振分束器的第一倾斜轴定向，使得偏振光束相对于颜色分离表面标称偏振旋转到第二偏振方向，并且各个有色光束通过每个偏振光射出 的出口表面。 每个成像器被放置在分色和重组棱镜的出口表面之一以接收各个光束之一的彩色光，其中每个成像器可以分别调制有色光束的偏振状态。

公开(公告)号：US20070133096A1

公开(公告)日：2007-06-14

申请号：US11297544

申请日：2005-12-08

申请人： Charles Bruzzone ,  David Aastuen ,  Michael Keyes

发明人： Charles Bruzzone ,  David Aastuen ,  Michael Keyes

IPC分类号： G02B27/14

CPC分类号： H04N9/3167 ,  H04N5/7441

摘要： A projection system includes an image-forming device and a polarizing beamsplitter. Illumination light illuminates the image-forming device via the first polarizing beamsplitter. A retardation element is disposed between the image-forming device and the polarizing beamsplitter. A bias controller applies a bias to pixels of the image-forming device in the dark state so as to substantially maximize contrast in image light reflected from image-forming device. In some arrangements, the volume between the polarizing beamsplitter and the image-forming device is sealed, with the retarding element being disposed within the sealed volume and being attached to either the polarizing beamsplitter or the image-forming device.

摘要翻译： 投影系统包括图像形成装置和偏振分光镜。 照明光通过第一偏振分光器照射成像装置。 延迟元件设置在图像形成装置和偏振分光器之间。 偏压控制器在黑暗状态下对图像形成装置的像素施加偏压，以便基本上使从图像形成装置反射的图像光中的对比度最大化。 在一些布置中，偏振分束器和图像形成装置之间的体积被密封，延迟元件设置在密封体积内并附着到偏振分束器或图像形成装置。

公开(公告)号：US20050200955A1

公开(公告)日：2005-09-15

申请号：US11120371

申请日：2005-05-03

申请人： Jiaying Ma ,  David Aastuen ,  Abolghassem Mahmoodi

发明人： Jiaying Ma ,  David Aastuen ,  Abolghassem Mahmoodi

IPC分类号： G02F1/13 ,  G03B21/00 ,  G03B21/60

CPC分类号： G03B21/60 ,  G03B21/604

摘要： In one embodiment, a projection screen includes a diffuse reflecting polarizer that diffusively reflects light polarized in a first direction and transmits light polarized in a second direction. The projection screen may also include a second polarizer adjacent a back side of the diffuse reflecting polarizer, wherein the second polarizer is oriented to transmit light polarized in the second direction. The projection screen may appear substantially diffuse when viewed from a front side and substantially transparent when viewed from a back side.

摘要翻译： 在一个实施例中，投影屏幕包括扩散反射偏振器，其扩散地反射沿第一方向偏振的光并透射沿第二方向偏振的光。 投影屏幕还可以包括邻近漫反射偏振器的后侧的第二偏光镜，其中第二偏振器被定向成透射沿第二方向偏振的光。 当从前侧观察时，投影屏幕可能显示为基本上扩散，并且当从后侧观察时，投影屏幕基本上是透明的。

公开(公告)号：US20070211217A1

公开(公告)日：2007-09-13

申请号：US11748799

申请日：2007-05-15

申请人： Jiaying Ma ,  Charles Bruzzone ,  David Aastuen

发明人： Jiaying Ma ,  Charles Bruzzone ,  David Aastuen

IPC分类号： G03B21/14

CPC分类号： H04N9/3114 ,  H04N9/315

摘要： Single imager projection systems suffer from low light throughput, compared to three imager systems, because only one color band is illuminated at any one time. As a result, there is a need to increase the operating efficiency of the single imager projection system. The invention is directed to the incorporation of a high extinction ratio pre-polarizer, such as a compensated, multi-layer polarizer, in a single or dual imager projection system. This permits illumination with low f-number illumination light, and thus increases the efficiency of the projection system. The pre-polarizer may be incorporated within a polarization recovery unit to further enhance system efficiency.

摘要翻译： 与三个成像系统相比，单次成像器投影系统的光通量低，因为在任何一个时刻只有一个色带被照亮。 因此，需要增加单个成像器投影系统的操作效率。 本发明涉及将高消光比预偏振器（例如补偿的多层偏振器）结合在单个或双重成像器投影系统中。 这允许具有低f数照明光的照明，从而提高投影系统的效率。 预偏振器可以结合在偏振恢复单元内以进一步提高系统效率。

公开(公告)号：US20060215117A1

公开(公告)日：2006-09-28

申请号：US11088153

申请日：2005-03-23

申请人： David Aastuen ,  Charles Bruzzone ,  Jiaying Ma

发明人： David Aastuen ,  Charles Bruzzone ,  Jiaying Ma

IPC分类号： G03B21/14

CPC分类号： G02B27/1026 ,  G02B27/145 ,  G02B27/149 ,  G02B27/283 ,  H04N9/3105 ,  H04N9/315

摘要： Some projection systems use a polarization beamsplitter (PBS) for coupling light to and from an image-forming device. The PBS is typically formed with a reflective polarizing layer disposed between glass covers. Stress birefringence in the glass cover lying between the reflective polarizing layer and the image-forming device can reduce the image contrast of the projection system. A quarter-wave retarding element positioned between the glass cover and the image-forming device is used to compensate for the birefringence, at least in part. This permits the PBS to use glass covers formed of a glass material having a higher stress optic coefficient than before, while still maintaining high image contrast.

摘要翻译： 一些投影系统使用偏振分束器（PBS）来将光与图像形成装置耦合。 PBS通常形成有设置在玻璃盖之间的反射偏振层。 位于反射偏振层和图像形成装置之间的玻璃罩中的应力双折射可以降低投影系统的图像对比度。 使用位于玻璃盖和图像形成装置之间的四分之一波长延迟元件至少部分地补偿双折射。 这允许PBS使用由具有比以前更高的应力光学系数的玻璃材料形成的玻璃盖，同时仍然保持高的图像对比度。