EP 4111252 A1 20230104 - PUPIL EXPANDER WITH IMPROVED COLOR UNIFORMITY
Title (en)
PUPIL EXPANDER WITH IMPROVED COLOR UNIFORMITY
Title (de)
PUPILLENAUFWEITER MIT VERBESSERTER FARBGLEICHMÄSSIGKEIT
Title (fr)
EXPANSEUR DE PUPILLE À UNIFORMITÉ DE COULEUR AMÉLIORÉE
Publication
Application
Priority
- US 202016799499 A 20200224
- US 2021014051 W 20210120
Abstract (en)
[origin: WO2021173253A1] An optical waveguide comprises one or more upstream diffraction gratings in addition to overlapping first and second downstream diffraction gratings. The one or more upstream diffraction gratings include a first upstream diffraction grating configured to receive display light and to release the display light expanded along a first axis. The first and second downstream diffraction gratings are configured to receive the display light expanded along the first axis and to cooperatively release the display light further expanded along a second axis. The first downstream diffraction grating is arranged on a planar face of the optical waveguide and is further configured to further expand along the first axis the display light expanded along the first axis.
IPC 8 full level
G02B 27/01 (2006.01)
CPC (source: EP)
G02B 27/0172 (2013.01); G02B 2027/0112 (2013.01); G02B 2027/0116 (2013.01); G02B 2027/0174 (2013.01)
Citation (search report)
See references of WO 2021173253A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
WO 2021173253 A1 20210902; CN 115151855 A 20221004; EP 4111252 A1 20230104
DOCDB simple family (application)
US 2021014051 W 20210120; CN 202180016500 A 20210120; EP 21705747 A 20210120