Stacked grating and AR display device

• Main Authors: LAN FUYANG, ZHAO JIN, SHAO CHENDI
• Format: Patent
• Language: Chinese; English
• Published: 19.04.2022
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

The invention discloses a stacked grating and an AR (Augmented Reality) display device. The stacked grating comprises a plurality of at least two grating layers which are sequentially stacked from bottom to top, wherein a plurality of grating grooves are formed in the grating layer; a staggered interval exists between the grating grooves of two adjacent grating layers, and all the staggered intervals are periodically distributed from bottom to top. The at least two grating layers are sequentially stacked from bottom to top, and all the staggered intervals are periodically distributed from bottom to top, so that the stacked grating is equivalent to a volume grating, the selectivity of grating diffraction to transmission/reflection can be improved, privacy leakage can be reduced, and the energy utilization rate can be improved. 本发明公开了一种堆叠光栅及AR显示装置，堆叠光栅包括：自下而上依次堆叠设置的若干至少两个光栅层；其中，所述光栅层上设置有若干个光栅槽；相邻两个光栅层的光栅槽之间存在错位间距，所有所述错位间距自下而上形成周期性分布。由于至少两个光栅层自下而上依次堆叠，且所有所述错位间距自下而上形成周期性分布，则堆叠光栅等效为体光栅，可提升光栅衍射对透射/反射的选择性，从而可以降低隐私泄露