One or more embodiments of a backlight assembly include a light guide plate, a light source module and an optical sheet. The heating control system includes a processing unit, at least one fluid temperature sensor positioned on or within the fluid receptacle, a heating element configured to heat fluid within the fluid reservoir, and a power switch disposed within an electrical path between the heating element and the processing unit. The base station selects an interference mitigation mode in the downlink communication when the radio interference from the base station to the second mobile terminals that are located close to the edge of the communication area of the second base station is large. The system is arranged such that light from particles in focus in the sensing region is focused on the relatively small center portion of the aperture. The at least one second wing has an engagement region, such that a distance between the engagement regions and the base plate is operative to vary continuously according to a slot thickness.