Patent · US Active

Device for extending the exit pupil and head up display comprising said device

US10247942B2 · kind B2 · utility

0Cited by

0References

13Claims

0Family size

Assignee

COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES · FR

Inventor

Umberto Rossini · Voiron, FR

Key dates

Filing date	Nov 21, 2014
Grant date	Apr 2, 2019
Priority date	—
Expiry date	Nov 21, 2034

Classification

Technology area (CPC G)Physics
CPC primaryG02B2027/015
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An optical device comprises a transparent plate the first surface of which is reflective; a first partially reflective and partially transmissive layer covering a second surface of the transparent plate opposite the first surface, and a second layer covering the surface of the first layer opposite the transparent plate, wherein the second layer is made of a material having an optical index which differs from the optical index of the transparent plate by less than 10% and preferably by less than 5%, and the second layer comprises, on the surface thereof opposite the first layer, structures forming a diffraction grating suitable for promoting the extraction of light towards the outside of the transparent plate.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.