The bulk of O. grasses grow in the sun but there are some for shadier parts of the garden. What zone are you? Haklonechloa, some Carex, Chasmanthium come to mind and there are others of course.

And then there are the "grass-like" plants like liriope and mondo grass, which do quite well in shade. And sweet flag (Acorus spp) will do well in part shade as long as it receives even moisture.