METHOD FOR DRIVING, AND A CIRCUIT OF AN ELEMENT OF AN ILLUMINATED DISPLAY

摘要

In illuminated displays with lighting elements (3) which are driven by means of a control voltage, the voltage drop on a supply line, which supplies two or more lighting elements (3), is compensated for. The currents for all of the light elements (3), which are connected to a supply line, and the known resistances are used to calculate the potential profile of the supply line (20) for this purpose. The control voltages for the light elements (3) are changed such that the actual potential on the supply line (20) for each element (3) is taken into account. Fluctuations in the brightness of the illuminated display resulting from potential differences are avoided. One element (3) of an illuminated display has a current control means (4), a signal retaining means (6), a light emitting means (8) and means (12) for interrupting the current flow through the light emitting means (8). The control voltage is adjusted with the current flow interrupted, so that no potential differences exist on the supply line. The signal retaining means (6) hold the control voltage relative to the potential on the line at the respective position of the lighting element (3). An illuminated display has adjustable voltages for the supply lines (20). The voltages are chosen to be sufficiently high that the minimum required voltage for setting the desired currents through the lighting elements (3) is achieved.