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LED projection architectures for stereoscopic and multiview 3D displays

机译：立体和多视图3D显示器的LED投影架构

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LED-based projection systems have several interesting features: extended color-gamut, long lifetime, robustness and a fast turn-on time. However, the possibility to develop compact projectors remains the most important driving force to investigate LED projection. This is related to the limited light output of LED projectors that is a consequence of the relative low luminance of LEDs, compared to high intensity discharge lamps. We have investigated several LED projection architectures for the development of new 3D visualization displays. Polarization-based stereoscopic projection displays are often implemented using two identical projectors with passive polarizers at the output of their projection lens. We have designed and built a prototype of a stereoscopic projection system that incorporates the functionality of both projectors. The system uses high-resolution liquid-crystal-on-silicon light valves and an illumination system with LEDs. The possibility to add an extra LED illumination channel was also investigated for this optical configuration. Multiview projection displays allow the visualization of 3D images for multiple viewers without the need to wear special eyeglasses. Systems with large number of viewing zones have already been demonstrated. Such systems often use multiple projection engines. We have investigated a projection architecture that uses only one digital micromirror device and a LED-based illumination system to create multiple viewing zones. The system is based on the time-sequential modulation of the different images for each viewing zone and a special projection screen with micro-optical features. We analyzed the limitations of a LED-based illumination for the investigated stereoscopic and multiview projection systems and discuss the potential of a laser-based illumination.
机译：基于LED的投影系统具有几个有趣的功能：扩展的色域，较长的使用寿命，坚固性和快速的开启时间。但是，开发紧凑型投影仪的可能性仍然是研究LED投影的最重要动力。与高强度放电灯相比，这与LED投影仪的光输出受限有关，这是由于LED的亮度相对较低而导致的。我们已经研究了几种LED投影架构，用于开发新的3D可视化显示器。基于偏振的立体投影显示器通常使用两个相同的投影仪来实现，这些投影仪在其投影透镜的输出端带有无源偏振器。我们已经设计并构建了一种融合了两台投影机功能的立体投影系统的原型。该系统使用高分辨率的硅上液晶光阀和带LED的照明系统。还针对此光学配置研究了添加额外的LED照明通道的可能性。多视图投影显示器可让多个观看者看到3D图像，而无需佩戴特殊的眼镜。具有大量观看区域的系统已经被演示。这样的系统经常使用多个投影引擎。我们研究了一种仅使用一个数字微镜设备和基于LED的照明系统来创建多个查看区域的投影体系结构。该系统基于每个观看区域的不同图像的时间顺序调制以及具有微光学功能的特殊投影屏幕。我们分析了基于立体照明和多视图投影系统的基于LED的照明的局限性，并讨论了基于激光的照明的潜力。

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