LCD technology is constantly competitive with plasma technology to achieve the best picture quality. When you open up an ad and skim the TV section, you will see the term "LED" followed by "LCD," because the technology is created solely for LCD TVs. Now, before we can discuss what LED exactly is, we must discover what LCDs generally use to create a picture. They all depend on a backlight, in one way, shape, or form to light the LCD panel itself. Most of them rely on a fluorescent backlight, also known as CCFL. However, many manufacturers are beginning to employ the LED technology instead. What LED rings to the table is not only the fact that it uses less energy, but the fact that it delivers deep, rich black levels that rival (or even surpass) those of top plasma TVs. The price reflects the level of performance, which is higher than regular LCD TVs.
To clear up some questions that are commonly asked by consumers, when talking about LED backlights, today's televisions use one of two major versions. The first is referred to as "local dimming." What this basically does does allows the backlight to dim or turn off in different areas of the screen. Let's not forget that black levels are the most important factor in HDTV picture quality. The second version is called "edge lit." The name comes from the arrangement of LEDs along the edge of the screen, which allows for extremely thin designs. In recent tests, the local dimming technology out performed the edge lit in terms of performance and picture quality.