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Waveguides with integrated spacers and related systems and methods
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A technology of spacers and waveguides, applied in the directions of optical waveguides, optical waveguides, coupling of optical waveguides, and optical waveguides
Pending Publication Date: 2022-04-12
MAGIC LEAP INC
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Because the human visual perceptionsystem is complex, it is challenging to generate AR technologies that facilitate the comfortable, natural-feeling, rich presentation of virtual graphic elements with other virtual or real-world graphic elements
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[0068] Near-eye augmented and virtual reality display systems may include eyepieces for directing image information into the eyes of a viewer. The eyepiece can be formed from a stack of waveguides spaced apart by intermediate beads. It will be appreciated that the size of the beads and the separation between the waveguides provided by the beads may affect the optical performance of the eyepiece and the perceived image quality of the display system. For example, a bead can be formed at a specific location, and then the upper layer waveguide can be pressed onto the bead with a specific pressure, after which the bead can be hardened by curing. Therefore, bead formation may require precise alignment and controlled pressure to maintain a constant separation distance between waveguides throughout the waveguide stack. Providing such precise alignment and pressure control can be challenging.
[0069] Additionally, complications may arise during the dispensing of the liquid adhesive....
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Abstract
A head-mounted near-eye display system includes a stack of waveguides having integrated spacers that separate the waveguides. The waveguides may each include a diffractive optical element formed simultaneously with the spacer by imprinting or casting. Spacers are disposed on one or more major surfaces of the waveguides and define a distance between directly adjacent waveguides. Adjacent waveguides may be bonded using an adhesive on the spacer. The spacer may fit within the indentation of the upper layer waveguide. In some cases, the spacers may form one or more material walls that substantially surround a perimeter of the associated waveguide. Vent holes may be provided in the wall to allow gas to flow into and out of the interior volume defined by the spacer. A debris capture structure may be provided between the two spacer walls to capture and prevent debris from entering the interior volume.
Description
[0001] priority claim [0002] This application claims the benefit of priority to U.S. Provisional Application No. 62 / 865,689, filed June 24, 2019; and U.S. Provisional Application No. 62 / 908,247, filed September 30, 2019. Each of these provisional applications is incorporated herein by reference. [0003] incorporated by reference [0004] This application incorporates by reference the entire contents of each of the following patent applications: PCT Application No. PCT / US2019 / 025224; US Application No. 14 / 555,58 filed November 27, 2014, which was published as US Publication No. 2015 / 0205126 on July 23, 2015; Application No. 14 / 690,401, published October 22, 2015 as U.S. Publication No. 2015 / 0302652; U.S. Application No. 14 / 212,961, filed March 14, 2014, now August 16, 2016 issued US Patent No. 9,417,452; and US Application No. 14 / 331,218, filed July 14, 2014, which was published as US Publication No. 2015 / 0309263 on October 29, 2015. technical field [0005] The present...
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