Abstract: A luminous panel includes a transparent plate provided with two opposite flat surfaces which are connected by an edge surface, a reflecting surface which is disposed oppositely with respect to the surface at a nonzero distance in such a way that a transparent medium blade whose optical index is less than that of the plate material is formed, and source facilities which radiate light beams, are arranged on the periphery of the plate and the surface and connected to each other in order to direct a part of the light beams towards the edge surface and another part of the light beams to the blade in such a way that a portion of the part of the beams is reflected from the surface and returned towards the surface. The luminous panel can be used for producing large-sized flat video screens.

Abstract: Display backlights arranged in an environment with an optical index n1 such as air. The display backlight includes a transparent plate with an optical index n2 higher than n1, the plane is delimited by two parallel plane surfaces and by a peripheral edge. The display backlight also includes a light source coupled with the peripheral edge such that the rays emitted by the source penetrate into the plate and are propagated inside the plate between the two surfaces mainly by total internal reflections. The display backlight further includes a layer made of a transparent material arranged in optical contact with a plane of the plate, the material of the plane having an optical index n3 higher than n1.