Video connections: You have to get the image from your disc player or set-top box into the TV set, and to do so you need to use a video connection. Only three connectors--HDMI, component video, and "VGA"--can deliver HD-resolution images, and of those only HDMI is capable of providing full 1080p HD over an HDCP-protected connection.
LED backlight: "LED TVs" are LCD TVs with an LED backlight instead of a standard fluorescent backlight. LEDs consume less power and produce better color response than traditional backlights do, and they also make it possible to create a much thinner LCD TV.
Dynamic backlight or local dimming: Some LCD TVs with LED backlights have the LEDs in a matrix behind the LCD panel, as opposed to other designs that put the LEDs along the edge of the panel to make a thinner TV set. It is possible to turn the LEDs in some sections down or even off, independently of the rest of the backlight. This means that the set can lower the backlight for portions of an image that are dimmer and do not need the backlight's full power. The result is that the set can increase the contrast significantly, as well as save energy.
120Hz refresh rate: A set running at the 120Hz rate takes the normal 60 images per second from the video signal and creates an intermediate image between every pair to create 120 images per second. This increase in refresh rate can help reduce motion blurring in LCD TVs.
240Hz refresh rate: Some sets double the 120Hz approach, creating three intermediate images per pair of frames. Other models simply use the 120 frames but flash the backlight two times per frame. Both of these approaches are intended to reduce motion blur even more, but you are not likely to notice the difference.
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