The present invention relates to a backlight module for 3D displaying and an LED light bar thereof. Data relating to static and dynamic accelerations are stored with recorded image data for further processing, such as for correcting image data for roll, pitch and vibrations and for displaying recorded images with a predetermined orientation using information about, e. The mechanism determines the size of a display area in which data corresponding to the temporal range is to be displayed. In use the swirler means swirls the discharge flow.