Display device with diffraction grating having reduced polarization sensitivity

US12135442B2 · kind B2 · utility

Assignee

• Magic Leap, Inc. · US

Inventors

• Vikramjit Singh · Pflugerville, US
• Kang Luo · Austin, US
• Xiaopei Deng · Cedar Park, US
• Shuqiang Yang · Austin, US
• Frank Y. Xu · Round Rock, US
• Kevin Messer · Mountain View, US

Key dates

• Filing date: Mar 9, 2023
• Grant date: Nov 5, 2024
• Expiry date: Mar 9, 2043

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B2027/0185
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Diffraction gratings provide optical elements in head-mounted display systems to, e.g., incouple light into or outcouple light out of a waveguide. These diffraction gratings may be configured to have reduced polarization sensitivity. Such gratings may, for example, incouple or outcouple light of different polarizations, or polarized and unpolarized light, with a similar level of efficiency. The diffraction gratings and waveguides may include a transmissive layer and a metal layer. The diffraction grating may comprise a blazed grating.