Patent ID: 8322902

Claim:
An optical system for a motor vehicle, said optical system performing at least one main optical function particular comprising: a diffusion screen; at least one light source, of an LED type, each of said at least one light source of the optical system producing a set of rays of light to be propagated in the diffusion screen; wherein said diffusion screen is in the form of a sheet with an upper lateral flange surface and a lower lateral flange surface which are joined by a periphery having a rear face and a front edge, wherein the diffusion screen is curved with a rear facing portion and a side facing portion; wherein said optical system performs both a main optical function and a complementary optical function said at least one main optical function is performed essentially via diffusively illuminating the rear facing portion of the upper lateral flange and an output face constituted by the front edge of the diffusion screen wherein the rear facing portion and front edge are visible from a rear of the vehicle; and wherein said complementary optical function is performed essentially via the side facing portion of the upper lateral flange that is visible from a side of the vehicle, wherein said at least one main optical function provides a brake, position light, or turn indicator on a rear of the motor vehicle, and said complementary optical function provides a light on a side of the motor vehicle and provides a different optical function than said at least one main optical function.