Global Backlight Module Manufacturers Adopt RGB LED Backlight Module
The left image above shows the original traditional technology which black border space exists among R, G and B color photoresist and it has only 65% of light open rate, and final result is that it only gets about 22% luminous efficiency because photoresist blocks the two other lights. Meanwhile, the right image above shows color sequential or color filter-less technology which uses no color filters, so that R, G, B transform sight quickly, opening rate is better, and use efficiency of light is almost no loss. Besides， it saves the cost of color filter about 15%. This technology has been adopted by smart phones for a few years. And large size LCD panels have just adopted this technology because of relatively slow speed of liquid crystal.
The feature of LED is monochromatic and it can reach 130% of NTSC if 6 color LED lamps are used, so we can see the excellent color performance that the golden color of coast dusk and the green color of inserts. LED has a better luminous efficiency, comparing with CCFL. We take small size display panels for example. CCFL emits the light in all direction, although semicircular cover reflects the outside non-useful light, the using light efficiency of CCFL gets worse. If the luminous efficiency of CCFL is 721 lm/w and the using efficiency is 75%, the final using luminous efficiency is 541 lm/w. Meanwhile, if luminous efficiency of LED is 721 lm/w, and the using efficiency is 90% because of LED good direction, the final using luminous efficiency is 541 lm/w. The luminous efficiency of LED enhances with the development of technology and it will greatly increase its advantage in the future.
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