Apple Inc.

Yukinori Asakawa

Hyungryul J Choi

Zhenbin Ge

Xianwei Zhao

Francesco Aieta

Yoshitaka Matsui

Yifei Wang

Jun Xie

Xiaoyong Fu

Wencong Zhu

Zhujun Shi

Shigeto Kobori

An electronic device may have a display system. The display system may include a waveguide, an input coupler, and a surface relief grating (SRG) structure. There are various ways to form a SRG structure. In one example, nanoimprinting may be performed on a low-index resin to form a mold for a subsequent deposition of high-index material. The high-index material conforms to the mold to form ridges for the SRG structure. A reusable mold may be formed with a plurality of ridges on a flexible substrate and coated by an anti-stick coating. The reusable mold may be coated with a high-index material that is attached to a glass substrate and cured to form a wafer-level SRG structure with high-index ridges on a glass substrate. The wafer-level SRG structure is subsequently diced. SRG structures may also be formed that include varying trough thicknesses, varying ridge thicknesses, and/or a sloped substrate.

Methods of forming holographic gratings for optical systems

Growing community of inventors

Saitama, Japan

Yukinori Asakawa