The invention relates to a device (2) for emitting a light beam (50) intended for producing an image, said device comprising at least one source (20, 20', 20") emitting a light beam (23, 23', 23"), and further comprising attenuation means (40) situated downstream of said source (20, 20', 20"), which means are designed to vary the optical power of the light beam (50) by modifying an orientation of a polarization of the light beam (50) in relation to a polarization element (42). According to the invention, the device further comprises an optical component (30) which is located upstream of the attenuation means (40), has a flat boundary (31) and is arranged such that the light beam (50) is refracted on said flat boundary (31) substantially at Brewster's angle of incidence. The invention also relates to a display (1) comprising an emission device (2) of this type.
