OPTICAL DEVICE AND ELECTRONIC DEVICE

An optical device (100) and an electronic device (200). The optical device (100) comprises at least one waveguide substrate (104), and a coupling-in unit (101), a first relay unit (1021), a second relay unit (1022) and a coupling-out unit (103) arranged on the waveguide substrate (104). The first relay unit (1021) and the second relay unit (1022) define a relay area enabling a direction of travel of a portion of a light ray coupled in by the coupling-in unit (101) to be limited to fully reflective propagation between the first relay unit (1021) and the second relay unit (1022) after entering the waveguide substrate (104), and another portion of the light ray may be redirected at the second relay unit (1022) towards the coupling-out unit (103) for fully reflective propagation. When a light ray which is fully reflected towards the coupling-out unit (103) reaches the coupling-out unit (103), a portion of the light ray continues to be fully reflected in the original direction and another portion is coupled out to