The LEDs that illuminate the LCD panel of an LED TV can be placed in several different ways. The most common thing today is that they are located along the edges of the TV (called "edge-lit"). The light they generate is controlled behind the LCD panel and evenly distributed behind it. One of the biggest advantages of this technology is that the TV sets can be made incredibly thin.
Today, the LEDs are usually placed along the edges of the TV.
The other solution is to place the LEDs directly behind the LCD panel (called "back-lit"). This solution is used in some of the cheapest and some of the most expensive TV models. The solution makes the TV somewhat thicker, but can also provide a great advantage for the contrast (explained later in this chapter).
It is not possible to say that one lighting technique is better than the other. The problems with uneven lighting that edge-lit TVs suffered from initially have less impact over time. Now the image quality is rather determined by how well worked the lighting is. An edge-lit TV from the premium segment may well have a more even lighting than a back-lit TV from the budget segment.
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