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首页> 外文会议>Advances in Display Technologies III >Microlens array based LCD projection display with software-only focal distance control
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Microlens array based LCD projection display with software-only focal distance control

机译：基于微透镜阵列的LCD投影显示器具有纯软件的焦距控制

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State of the art LED pico-projectors using single-channeled optical layouts are always constricted by a trade-off between achievable flux and minimum system size. Furthermore, their limited depth of focus require additional mechanically moving components for focusing if variable projection distances are essential for their specific application. We present a novel microlens-array based LCD projector breaking these constraints of conventional LED illuminated systems, thus enabling a super compact, robust and bright module while offering new features for electronic focal distance control without additional mechanical components. While the short focal length of each contributing channel maintains a certain system slimness, the superposition of all individual projections on a screen done by image-preprocessing leads to dramatic flux enhancement without blurring effects. Starting with a description of the working principle of array projection we focus on key properties regarding depth of focus for examining novel image-preprocessing algorithms that enable for only software-controlled focal distance. Further improved program code enables sharp images even onto free-form screen geometries. The realized prototype utilizes a transmissive LCD microdisplay along with a monolithic array of 45 microlenses actively aligned to the top of the display coverglass. While the display is illuminated by a collimated white LED; each channel is assigned to one primary color by applying a color filter array buried below the microlenses to obtain a full color image on the screen. The displayed image content is controlled via PC by a novel software tool, whose correct operation is verified by experimental results.
机译：使用单通道光学布局的先进LED微型投影仪总是受到可达到的光通量和最小系统尺寸之间的折衷的限制。此外，如果可变的投影距离对其特定应用至关重要，则其有限的聚焦深度需要额外的机械移动组件进行聚焦。我们提出了一种新颖的基于微透镜阵列的LCD投影仪，打破了传统LED照明系统的这些限制，从而实现了超紧凑，坚固和明亮的模块，同时提供了电子焦距控制的新功能，而无需额外的机械组件。虽然每个贡献通道的短焦距都保持了一定的系统纤细度，但是通过图像预处理在屏幕上叠加所有单个投影会导致戏剧性的光通量增强而不会产生模糊效果。从描述阵列投影的工作原理开始，我们将重点放在有关焦点深度的关键属性上，以研究仅能由软件控制的焦距的新颖图像预处理算法。进一步改进的程序代码甚至可以在自由形式的屏幕几何图形上生成清晰的图像。实现的原型利用了透射式LCD微型显示器以及45个微透镜的单片阵列，该阵列主动对准了显示器盖玻片的顶部。当显示屏由准直的白色LED照明时；通过应用掩盖在微透镜下方的滤色器阵列，将每个通道分配给一种原色，从而在屏幕上获得全彩色图像。通过新颖的软件工具通过PC控制显示的图像内容，并通过实验结果验证了其正确操作。

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