1.1 adds contrast to the image displayed on the display panel which makes it better in detail, especially in scenes with dark images. Or brightness of a scene object in the picture several levels (such as snow in the picture at night) or by the conclusion that LED tube light shooting from the LCD screen makes viewing a picture to show more dimension!
2.2 assists LCD Panel that can display more colors (wider color gamut), which allows images to see more natural.
3.3 allowing manufacturers to produce screens that are thin. Emissions and less heat while running the screen.
4.4 reduce production costs. And saves energy.
