Optical waveguide and display device

G - Physics – 02 – B

Patent

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Details

G02B 27/01 (2006.01) G02B 27/00 (2006.01)

Patent

CA 2758633

In a slab waveguide which expands an image-bearing pupil into a visible image, reflective edge surfaces are used to redirect once-diffracted light back through the same grating structure. The number of separate grating structures thereby can be reduced to two or even one, compared to three in the prior art.

L'invention porte sur un guide d'onde plan qui agrandit une pupille portant une image en une image visible, des surfaces de bord réfléchissantes étant utilisées pour rediriger une lumière qui a été diffractée à travers la même structure de réseau de diffraction. Le nombre de structures de réseau de diffraction séparées peut ainsi être réduit à deux ou même à un, par comparaison avec trois dans l'état antérieur de la technique.

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