The true reasons LED backlight is replacing CCFL backlight
People often talk about that LED backlight is replacing CCFL backlight in LCD TV because of CCFL backlight’s mercury problem, 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 sense of reasons why LED backlight is replacing CCFL backlight are that fast driving speed, avoiding blur and region control. Also, they are the LED backlight technology development direction.
There are some wrong opinions. Some people refer LED which is without mercury as green product. But as a matter of fact, EU environmental standards require that mercury is less than 5mg, which is not a problem for CCFL backlight industry. Meanwhile, some people talk about that the color performance of CCFL backlight can only reach 72% of NTSC and LED backlight’s can easily exceed 100% of NTSC. But CCFL backlight technology which can reach 100% of NTSC color performance has been already invented.
Tips: National Television Standards Committee (NTSC)
We notice that LED backlight technicians in Japan and Korea dedicate to develop feature of LED, such as regional control. Therefore, the direction of research and development will be toward the high density of LED which makes 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 colors independent, meanwhile 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, it will increase double the light. In addition, liquid crystal display constantly turns on/off light to display the images. But the power of CCFL is always on that may cause the backlight bleeding and poor contrast, even blur problem. And LED backlight could easily solve these problems which make LED backlight regional control even better.
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