Abstract: A multiple discharge tube lighting system has a plurality of gas discharge tubes positioned behind a translucent panel, within a cove or tube or in close proximity to each other and each tube is connected through a power supply to a dimming control circuit. The control circuit is used to change the brightness and on/off state of each tube to create the appearance of different colors when the tubes are viewed in combination using dimming and/or interleaving. The control circuit can match dimming curves, and stores, retrieves and sends power information for each tube to create displays which can be identically produced repeatedly.

Abstract: The invention relates to a method and apparatus for correcting image errors caused by residual magnetism in monitors and other such display devices based on picture tubes. The method according to the invention is based on the removal of residual magnetism by means of an alternating damped magnetic field. In the method, the internal and external structures in the neck part (11) of a picture tube (10) are subjected to an alternating damped magnetic field produced by means of a coil (45).