US 2021/0011284 A1 · APODIZED REFLECTIVE OPTICAL ELEMENTS FOR EYE-TRACKING AND OPTICAL ARTIFACT REDUCTION

Abstract

Techniques disclosed herein relate to a near-eye display system. One example of an eye-tracking system includes a substrate transparent to visible light and infrared light and a reflective holographic grating conformally coupled to a surface of the substrate. The reflective holographic grating is configured to transmit the visible light and reflectively diffract infrared light in a first wavelength range for eye tracking. The refractive index modulation of the reflective holographic grating is apodized in a direction along a thickness of the reflective holographic grating to reduce optical artifacts in the visible light.

Claims20

Dependent claims

An eye-tracking system comprising:

a substrate transparent to visible light and infrared light;
and
a reflective holographic grating conformally coupled to a surface of the substrate, wherein:
the reflective holographic grating is configured to transmit the visible light and reflectively diffract infrared light in a first wavelength range for eye tracking;
and
a refractive index modulation of the reflective holographic grating is apodized in a direction along a thickness of the reflective holographic grating to reduce optical artifacts in the visible light.

3 more elements

A method of fabricating an optical device for a near-eye display, the method comprising:

forming a photopolymer layer on a substrate of the optical device, the photopolymer layer sensitive to light in a first wavelength range;
forming a light pattern having a non-uniform intensity in the first wavelength range in the photopolymer layer to selectively desensitize the photopolymer layer;
and
recording an apodized holographic grating in the selectively desensitized photopolymer layer using coherent light in the first wavelength range, wherein the apodized holographic grating is configured to reflectively diffract infrared light that is outside of the first wavelength range to or from an eye of a user of the near-eye display.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

16/505,462Filed 8 Jul 2019

Published

14 Jan 2021

Term ends

Not estimatedThe source records don’t support an estimate.

Classification16 codes

G02B 27/0025
Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00: for optical correction, e.g. distorsion,…
G02B 5/1861
Diffraction gratings: reflection gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations,…
G02B 5/32
Optical elements other than lenses: holograms used as optical elements
G02B 27/0018
Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00: with means for preventing ghost images

Apodized reflective optical elements for eye-tracking and optical artifact reduction

Life of this patent

Apodized reflective optical elements for eye-tracking and optical artifact reduction

Life of this patent

Abstract

Claims20