Abstract: The invention relates to a directional lighting device (10) which comprises: a light emission source (30); a cover (40) covering the light emission source (30), and provided with an inner wall (41) and an outer wall (42) which delimit an inter-wall space (44), and filled with a fluid, the cover (40) comprising transmission zones (45), each formed of an inner zone (45a) and an outer zone (45b), facing one another, and at which an electric field is capable of being applied to the functional fluid by means of a first electrode (46a) and a second electrode (46b), the functional fluid being adapted to, under the effect of an electric field sensed at a given transmission zone, form with the latter a window transparent to the luminous radiation, and be either opaque or reflective and/or diffusive to said radiation in the remainder of the inter-wall volume (43).

Abstract: The invention relates to a directional lighting device (10) which comprises: a light emission source (30); a cover (40) covering the light emission source (30), and provided with an inner wall (41) and an outer wall (42) which delimit an inter-wall space (44), and filled with a fluid, the cover (40) comprising transmission zones (45), each formed of an inner zone (45a) and an outer zone (45b), facing one another, and at which an electric field is capable of being applied to the functional fluid by means of a first electrode (46a) and a second electrode (46b), the functional fluid being adapted to, under the effect of an electric field sensed at a given transmission zone, form with the latter a window transparent to the luminous radiation, and be either opaque or reflective and/or diffusive to said radiation in the remainder of the inter-wall volume (43).

Abstract: A rear-projection display device comprises a mobile light source supplying a light beam of at least one wavelength, a holographic mirror reflecting only said at least one wavelength, an absorbent screen and a transmissive diffuser, the absorbent screen being placed on the rear face of the holographic mirror, the elements being arranged such that the beam from the light source is reflected on the holographic mirror in order to sweep the surface of the transmissive diffuser.

Abstract: A rear-projection display device comprises a mobile light source supplying a light beam of at least one wavelength, a holographic mirror reflecting only said at least one wavelength, an absorbent screen and a transmissive diffuser, the absorbent screen being placed on the rear face of the holographic mirror, the elements being arranged such that the beam from the light source is reflected on the holographic mirror in order to sweep the surface of the transmissive diffuser.

Abstract: The invention provides an organic light-emitting diode which includes at least two electroluminescent layers (ELR, ELB), both of which are fluorescent or phosphorescent and emit at different wavelengths, as well as a hole- and electron-conducting buffer layer (T) arranged between the electroluminescent layers. The buffer layer is a bi-layer having an electron-transport layer (T2) and a hole-transport layer (T1), each one of the hole- and electron-transport layers being made of one or more materials in which the HOMO level(s) are comprised between or equal to the HOMO levels of the electroluminescent layers, and in which the LUMO levels are between or equal to the LUMO levels of said electroluminescent layers, with a tolerance of 0.3 eV.

Abstract: The invention provides an organic light-emitting diode which includes at least two electroluminescent layers (ELR, ELB), both of which are fluorescent or phosphorescent and emit at different wavelengths, as well as a hole- and electron-conducting buffer layer (T) arranged between the electroluminescent layers. The buffer layer is a bi-layer having an electron-transport layer (T2) and a hole-transport layer (T1), each one of the hole- and electron-transport layers being made of one or more materials in which the HOMO level(s) are comprised between or equal to the HOMO levels of the electroluminescent layers, and in which the LUMO levels are between or equal to the LUMO levels of said electroluminescent layers, with a tolerance of 0.3 eV.