And compared to conventional CCFL Backlight, led backlight, the most significant advantage is that you can provide unparalleled color reproduction. By choosing the appropriate wavelength LED and match color film, LED backlight color reproduction range can meet the NTSC standard of 105% even more. In contrast, the traditional CRT TVs only about 85%, CCFL-backlit LCD TVs is only 65-75%.
picture quality is the life of the display industry, have the advantage of more bright colors would be overwhelming. According to the traditional view, LCD monitors especially flat-panel TVs because of color and response rate than CRT and PDP have been criticized, but once LED backlight, CRT and PDP in color will overwhelm the main competitors. In addition, the LED backlight to a certain extent caused by slow response of the tail. LED to jump-start, response rate reached NS level, is baiwanbei for CCFL. With such rapid response backlight, LCD display can instantly backlight blinking technology to eliminate normal LCD display there was a trailing fast moving objects blur, image quality will be significantly improved. More important is that using LED backlighting in different moments of monochromatic light switches, field sequential color can be achieved, so that you can completely take away cost around 30% of LCD color filter.
on the life, LED can be more than 100,000 hours, twice times the best CCFL, even watching TV 8 hours a day, you can see more than 30 years. And CCFL contain deadly mercury vapor within different LED is semiconductor solid state light sources, was an ideal green light. Since the EU began in July 2006, a comprehensive limit of electronic products containing mercury and other harmful elements into the, therefore, in order to use LED backlight LCD products during this period began to replace the CCFL and created excellent opportunities to the world. Cold cathode fluorescent tube needs high voltage AC drives, power transformer rectifier unit complex, and LED the secondary optics you can do very simple, without a lot of space, very thin fuselage could have done, and also reduce the weight a lot. SONY TX Series notebook computers as an example, and compared to the VAIO t series LCD cold cathode fluorescent tube, thickness reduced from 9mm to 4.5mm, weight is reduced by 26%. Mitsubishi Motors posted on SID2005 six-color LED backlight LCD TV only 5 cm! In addition, the LED can be lower than-40 ° c environment, rapid start, and CCFL is not work correctly in this kind of environment, good adaptability to the environment making LED backlit LCD monitor by the areas of military, aviation and exploration for all ages.
of course, current LED backlight also presented some problems. At present, the LED backlight is about 3-5 times of the same CCFL Backlight. Such a difference, enough to discourage the vast majority of manufacturers and users. Followed by cooling problems, LED back light source emits a lot of heat when it work, especially for large size LCD TV is more serious. So they need some forced cooling measures, such as fans, etc. There is also the problem of luminous efficiency. Currently about 30-35lm/W of the most efficient commercial LED light, luminous flux is only about one-second for CCFL (CCFL light emitting efficiency is about 60-70 lm/W), LED by greater power to achieve and CCFL brightness.
However, these issues are expected to be addressed within a relatively short period of time.
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