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LEDs for LED backlighting may be arranged along the edges of the LCD, or as a matrix over the back of the LCD assembly. The LEDs may be electrically connected in series or parallel. The basic LED driver for TV is powered by? 12 to 300 Vdc and uses a DC/DC boost converter to provide voltage to a constant-current driver that drives the LED string. For quality performance, a constant-current driver is required to compensate for LED voltage drops and changes with temperature, to ensure stable light output.