Luminous timepiece display using optical coupling via microstructures

A display device (100) for a watch (1000) including at least one light source (200) and including, between a dial (300) carrying at least one reference scale on a top side (301) and a crystal (400) on the side facing the user, a set of hands (10) coaxial about an axis of rotation (D) including at least a first luminous indicator (1) including a first light guide (11) arranged to diffuse part of the light emitted by said at least one light source (200), wherein said first light guide (11) includes first coupling microstructures (110) arranged in the transparent layer of the first light guide, which are arranged to allow light to enter said first light guide (11) and/or to allow light to exit said first light guide (11).