Abstract: According to the invention, the diffusing structure comprises at least one diffusing layer intended to make a light source uniform and comprises at least one thermoplastic sheet designed to filter out part of the electromagnetic wave spectrum of said light source. The invention also relates to uses for the production of backlighting and/or projection systems or of flat lamps.

Abstract: An electrical supply device configured to deliver energy to a structure that includes at least two electrodes and a space containing a gas intended to be excited. The device includes a voltage generator, an inductor connected to the generator and connected to the structure to supply the two electrodes with a periodic voltage of given frequency, and a resonance mechanism for fixing the frequency at substantially the resonant frequency of the system of the structure and the inductor.

Abstract: The backprojection and/or projection screen comprises at least a first substrate joined to a scattering layer producing a subsurface effect, which offers a resolution of at least 5×103 dpi, the image being able to be displayed without blurring at a viewing angle of 180° on both faces of the screen.

Abstract: Diffusing substrate (20) comprising a glass substrate (21) and a diffusing layer (22) deposited on the said glass substrate, characterized in that the glass substrate (21) has a light transmission at least equal to 91% calculated over the 380 to 780 nm wavelength range according to the EN 410 standard.

Abstract: A flat lamp including at least two glass substrates kept mutually parallel and defined in an internal gas-filled space, including two electrodes associated with the glass substrates and away from the internal space, in which the internal face of at least one substrate turned toward the internal space is coated with a phosphor material. At least one of the electrodes is covered with at least one preferably transparent electrical insulation that may be formed by at least one of the glass substrates or be associated with at least one of the glass substrates.

Abstract: The object of the invention is a process for scanning a surface of a substrate (2), which process consists in taking at least one reflected image of at least one test pattern (1) on the said surface and extracting by digital processing local phases in two directions, characterized in that variations in local slopes are calculated by digital processing from the local phases in order to deduce therefrom variations in curvature or variations in altitude of the said surface.