The true reasons that LED backlight is replacing CCFL backlight
People often talk about that LED backlight is replacing CCFL backlight in LCD TV because of the mercury problem of CCFL backlight, the better color performance of LED backlight and something like that. If you think this is the end of the story, you certainly underestimate the advantages of LED backlight. The deeper reasons of “why LED backlight is replacing CCFL backlight” is that fast driving speed, blur avoiding and region control. Also, they are the developing direction of LED backlight technology.
There are some wrong opinions. Some people refer LED as a green product without mercury. But as a matter of fact, EU environmental standards require that mercury is less than 5mg, which is not a problem for CCFL backlight. Meanwhile, some people think that the color performance of CCFL backlight can only reach 72% of NTSC and LED backlight can easily exceed 100% of NTSC. But CCFL backlight technology which can reach 100% of NTSC color performance has already been invented.
Tips: National Television Standards Committee (NTSC)
We notice that LED backlight technicians in Japan and Korea dedicate to develop features of LED, such as regional control. Therefore, the direction of research and development will move towards the high density of LED, which will make small region control design better.
Besides, the driving speed of LED backlight is much faster than the driving speed of CCFL backlight. It takes 1-2 seconds to start-up for CCFL backlight which may cause the independent colors, while it takes only 50 ns to start-up for LED backlight which can adopt dynamic driving method, such as color filter-less. If backlight adopts color filter, it will block the two-thirds of the light. On the contrary, if backlight does not adopt color filter, the light will double increase. In addition, liquid crystal display constantly turns on/off light to display the images, but the power of CCFL is always on, which may cause the backlight bleeding and poor contrast, even the problem of blurred images. And LED backlight could easily solve these problems, which makes regional control of LED backlight even better.