Google patents waveguide grating method for AR displays
Google describes a method for creating tiny grooves in the glass used for augmented reality displays. By varying how deep these grooves are cut, the technology can control how light bends and spreads within the device.
In the filing’s own words
Inverse aspect-ratio dependent etching (ARDE) effects are utilized to produce grating structures with modulation of etch depth and/or grating filling factor. A series of grating trenches ( 201 - 209) is defined for etching in an optical substrate of a waveguide ( 210), each grating trench having a depth and a width. The series of grating trenches is formed in the optical substrate by removing a portion of the optical substrate from each of the grating trenches, such that forming the series includes modulating a respective etch depth of each grating trench of the series of grating trenches along a first dimension ( 250).
What exactly they claim (claim 1)
1. A method comprising: defining a series of grating trenches for etching in an optical substrate of a waveguide, each grating trench having a depth and a width; and forming the series of grating trenches in the optical substrate by removing a portion of the optical substrate from each of the grating trenches, wherein forming the series comprises modulating a respective etch depth of each grating trench of the series of grating trenches along a first dimension.
Facts
- Company
- Google (GOOGLE LLC)
- Official title
- WAVEGUIDE GRATING DEPTH AND FILLING FACTOR DUAL MODULATION
- Publication number
- US20260259413A1
- Application number
- 18878478
- Filed
- May 4, 2023
- Published
- Sep 3, 2026
- Inventors
- 4
- Claims
- 22
Classified under
G02B 27/0172 Physics & computingG02B 6/34 Physics & computingMore from Google in AR, VR & displays
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- Google patents AR glasses with two separate screens in one lens Oct 1, 2026
- Google patents AR glasses that switch light paths to widen the view Oct 8, 2026
Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.