'The LN-T5281F ($4,499) not only uses LED backlighting, it also employs an innovative new technique aimed at improving blacks and contrast called "local dimming," which dims the LEDs that light the screen in localized areas.'
'Samsung's claimed peak dynamic contrast ratio of 500,000:1 is a bit unrealistic, what I saw from this set on dark images was often startling.'
'The two televisions are similar, although the HP-T5064 is larger at 50 inches, has a higher resolution at 1,366x768, and is equipped with a few more features, including a better antiglare screen and a USB port for displaying digital photos.'
'Three HDMI ports, USB 2.0 and full connectivity devices with one remote'
'the two Samsung flat-panel LCD HDTVs are essentially identical but for screen size, so we expect the picture quality of the 46-inch model to provide a good indication of how the 40-incher will perform.'