| http://www.w3.org/ns/prov#value | - From this embodiment, the first grating 814 is a reflection type grating and the second and third gratings 816 and 818 are transmission type gratings.FIG. 8C shows the structure of a wearable display system where a display panel 822 is installed on the side of the eyes of a user and first, second and third gratings 824, 826 and 828 are installed on the side of the waveguide 820 opposite to theside
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