Wellenleiterstruktur

Details

Veröffentlichungs-Nr.

EP4722788

Anmeldetag

8. Februar 2018

Veröffentlichung

8. April 2026

Rechtsraum

EP

IPC

F21V8/00, G02B27/00, G02B27/01G02B27/01

Abstract

An optical waveguide device for use in a head up display. The waveguide device provides pupil expansion in two dimensions. The waveguide device comprise a primary waveguide and a secondary waveguide, the secondary waveguide being positioned on a face of the primary waveguide. The secondary waveguide has a diffraction grating on a face opposite to the face which contacts the primary waveguide. The diffraction grating diffracts light into more than diffraction order. Rays diffracted into a non-zero order are trapped in the secondary waveguide by total internal reflection.

Anmelder

Firma

SNAP INC

Land

🇺🇸 USA

Fachgebiete