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An LED TV is not a new kind of TV.

I appreciate a good marketing ploy as much as the next guy, but an LED TV is just an LCD TV that’s backlit with light-emitting diodes (LEDs) instead of standard cold-cathode fluorescent lights (or CCFLs). And though they became well-known last year with Samsung’s ultrathin models, LED-backlit LCDs have been on mainstream store shelves since 2007, when Samsung’s TD-T4681F debuted.

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p style=”margin: 0px 0px 20px; line-height: 1.23529em; font-size: 1.13333em; color: rgb(0, 0, 0); font-family: ” proxima nova”, proxima-nova, proxima-nova, helvetica, arial, sans-serif; font-style: normal; font-variant-ligatures: font-variant-caps: font-weight: 400; letter-spacing: orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: widows: word-spacing: -webkit-text-stroke-width: background-color: rgb(255, 255, 255); text-decoration-style: initial; text-decoration-color: initial;”>There are two LED backlight configurations

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p style=”margin: 0px 0px 20px; line-height: 1.23529em; font-size: 1.13333em; color: rgb(0, 0, 0); font-family: ” proxima nova”, proxima-nova, proxima-nova, helvetica, arial, sans-serif; font-style: normal; font-variant-ligatures: font-variant-caps: font-weight: 400; letter-spacing: orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: widows: word-spacing: -webkit-text-stroke-width: background-color: rgb(255, 255, 255); text-decoration-style: initial; text-decoration-color: initial;”>Initially, LED-based displays like the Samung LN-T4681F were backlit by what’s referred to as a “full array” of LEDs behind the LCD, across the back of the panel–just like a standard CCFL backlight. But to create even thinner TVs, engineers needed to eliminate that extra layer of LEDs and move it to the sides of the display.

With this form of backlighting, the LEDs are affixed to all four sides of the TV and light is projected inward to the middle of the TV via “light guides.” These types of TVs are commonly referred to as “edge-lit” LED-based LCDs, and are by far the most common available today.

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