Gradient encapsulation of waveguide gratings

The waveguide combiner design with a gradient encapsulant and asymmetric structures addresses the challenge of controlling diffraction efficiency and directivity, ensuring effective image overlay in augmented reality devices.

JP2026004346APending Publication Date: 2026-01-14APPLIED MATERIALS INC
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Patent Information

Application Number
JP2025154140
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2020-06-03
Filing Date
2025-09-17
Publication Date
2026-01-14

AI Technical Summary

Technical Problem

Existing waveguide combiners in augmented reality devices face challenges in controlling the diffraction efficiency and directivity of outcoupled light, which affects the overlay of virtual images on the surrounding environment.

Method used

A waveguide combiner design featuring a first grating with a decreasing fill factor encapsulant and asymmetric structures, combined with a method of encapsulation that controls the diffraction efficiency and directivity through a gradient encapsulant profile.

Benefits of technology

The solution enables precise control of diffraction efficiency and maintains directionality across the entire surface of the grating, allowing for full-range tuning without reducing grating depth, enhancing the overlay of virtual images in augmented reality devices.

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Abstract

Gradient encapsulation of waveguide outcoupler gratings to control diffraction efficiency and directionality.SOLUTION: The device includes a first grating formed over a substrate, the first grating having a plurality of first structures extending away from the substrate, the first grating corresponding to an out-coupler. The device includes a first encapsulant disposed in one or more gaps formed between adjacent first structures, wherein a fill ratio of the first encapsulant decreases along the first grating. A method of manufacturing the device is also described.SELECTED DRAWING: Figure 1B
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