The 9-Series is an LCD, and the B7000 series is an LED Television. Here's a quick breakdown of the differences:

LCD traditionally uses a CCFL (Cold Cathode Fluorescent Lamp) backlighting system that runs across the rear internal portion of the unit to illuminate the LCD panel from behind. The lamp life is estimated at 60 thousand hours, enjoys a tremendous following of enthusiasts, and translates into years of enjoyment of an affirmed, reliable and trusted technology.

LED is relatively new on the market, and uses specialized versions of the LED lights that have been used for years. It allows panels to be lit either from behind the panel (replacing the CCFLs with LEDs), or from the side using an efficient energy friendly infrastructure that emits light evenly behind the panel in order to illuminate the entire LCD panel equally, called EDGE-LED. EDGE-LED Technology has a few additional benefits in that the design of the LED panel can be slimmer than traditional LCD panels, and addresses screen uniformity issues and reduces energy consumption and are also eco-friendly. The LEDs have a similar life to CCFL.

LED also has a few additional benefits, such as offering an accurate and natural color, as well as an increased performance with black levels. LED is also free from toxic materials, such as the non-existence of mercury, lead or volatile organic compounds.