Optical system for a motor vehicle

An optical system for a motor vehicle, in particular for an indicating and/or lighting device, arranged to emit a light, the intensity of which is maximal in a given prioritized optical direction, said optical system comprising:

• a surface light source exhibiting a front wall emitting a light, the intensity of which is maximal in a principal direction of emission, said surface light source not being a point light source and comprising an organic light-emitting diode having an anode, a cathode and an organic layer adapted to emit said light when said organic layer is subject to an electrical substantially normal to a plane in which said front wall lies;
• an optical guide comprising an input face and an output face forming at least partly an outer face of said optical system, said optical system being arranged such that the light emitted by said surface light source penetrates said optical guide through said input face and escapes from said optical guide through said output face, said input face of said optical guide being adjacent to and at least partly covering said front wall of said organic light-emitting diode, said output face of said optical guide is not contained in a plane that is substantially normal to said prioritized optical direction;
• and
• wherein said principal direction of emission is different from said prioritized direction;
• said optical guide being conformed such that the intensity of the light at the output of said optical system is maximal in a direction that is substantially identical to said prioritized optical direction.