Abstract: The invention relates to a method for commanding a system controlled by means of a time-division multi-level command. The invention consists in acquiring two measurements by means of the sensor, each during a period, the two periods being dissymmetrical relative to the division of the command, determining an offset of the control subsystem and a corrected response without offset of the system to the command as a function of the measurements and of the measurement periods. With the aid of these two measurements, the invention makes it possible to eliminate the effect of the offset in the control subsystem of the system.

Abstract: The invention relates to a method for commanding a system controlled by means of a time-division multi-level command. The invention consists in acquiring two measurements by means of the sensor, each during a period, the two periods being dissymmetrical relative to the division of the command, determining an offset of the control subsystem and a corrected response without offset of the system to the command as a function of the measurements and of the measurement periods. With the aid of these two measurements, the invention makes it possible to eliminate the effect of the offset in the control subsystem of the system.

Abstract: The invention relates to a light box, intended especially for the backlighting of liquid crystal displays. The box includes a lightguide in the form of a thin plate having two opposed main faces and at least two edges, the lightguide having a light-diffusing optical structure on one of the faces. Light-emitting diodes are placed linearly along at least one of the edges of the lightguide, the light emitted by the light-emitting diodes illuminates the lightguide via the edge, and is being diffused by that face of the lightguide having the optical structure. The light-emitting diodes placed along each of the edges of the lightguide are organized in at least two rows and in such a way that a light-emitting diode in one row supplied by an electric power supply (S1 to S8) is immediately followed by a light-emitting diode in the other row supplied by another electric power supply.