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发明公开
CN109154718A 用于大视场部件的鲁棒体系结构 无效 - 撤回

用于大视场部件的鲁棒体系结构
摘要：
公开了用于增强现实显示器中的衍射束扩展器。设备可以包括具有第一衍射光学元件的光学基底，该第一衍射光学元件具有设置在一个表面上的第一衍射光栅和设置在相对表面上的第二衍射光栅。第一衍射光栅和第二衍射光栅的部分交叠以限定被配置为接收入射光的入耦区。第一衍射光学元件通过在第一区域和第二区域中的奇数阶衍射展开来扩展所接收到的光束的至少一部分，并且通过在第三区域中的偶数阶衍射展开来扩展所接收到的光束的至少一部分。然后，由第一衍射光学元件所产生的光分量被耦合到第二衍射光学元件，该第二衍射光学元件被配置为通过衍射将被扩展的衍射光分量的至少一部分出耦以离开基底。
摘要（英）：

A diffractive beam expander for use in an augmented-reality display is disclosed. The device can include a optical substrate with a first diffractive optical element having a first diffractive gratingdisposed on one surface and a second diffractive grating disposed on the opposing surface. Portions of the first and second diffractive gratings overlap to define an in-coupling area configured to receive a beam of incoming light. The first diffractive optical element expands at least part of the received light beam by odd-order diffraction expansion in a first region and a second region and expands at least part of the received light beam by even-order diffraction expansion in a third region. The light components by the first diffractive optical element are then coupled into a second diffractive optical element, which is configured to out-couple at least part of the expanded diffracted light components to exit the substrate by diffraction.

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