Intellectual Property India Publishes Patent Application for 'Display Devices Having Gratings With Gradient Edges' Filed by Apple Inc.

MUMBAI, India, Aug. 1 -- Intellectual Property India has published a patent application (202517063687 A) filed by Apple Inc., Cupertino, U.S.A., on July 3, for 'display devices having gratings with gradient edges.'

Inventor(s) include Born, Brandon.

The application for the patent was published on Aug. 1, under issue no. 31/2025.

According to the abstract released by the Intellectual Property India: "A display may include a waveguide and an optical coupler. The coupler may include one or more surface relief gratings (SRGs) in a substrate on the waveguide. The SRG(s) may have a central region and gradient lateral edges separating the central region from a non- diffractive region of the substrate. The SRG(s) may exhibit peak diffraction efficiency within the central region and may exhibit gradient diffraction efficiency across the gradient lateral edges from the central region to the non-diffractive region. The gradient diffraction efficiency may be produced by varying, across the gradient lateral edges, the amplitude of the SRG(s), the phase of the SRG(s), the duty cycle of the SRG(s), the blaze angle of the SRG(s), and/or the thickness of a high or low index coating layered over the SRG(s). This may serve to prevent the couplers from becoming undesirably visible and to minimize perturbation of replicated pupils."

The patent application was internationally filed on Jan. 22, 2024, under International application No.PCT/US2024/012424.

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