Analysis of EL backlight, CCFL backlight and LED backlight technology

In recent years, with the continuous development of liquid crystal display technology, especially the application field of LCD color display is constantly widening. Driven by the market of liquid crystal display, backlight industry presents a thriving scene.

As the core component of LCD TV backlight, in addition to the performance will directly affect the LCD imaging quality, the cost of occupying the LCD backlight module 3-5%, the power consumption of the module 75% accounted for more, it is an important component in LCD module.

At present backlight are mainly EL, CCFL and led three backlight type, according to the different distribution of light source position is divided into direct type and side light type. With the development of the LCD module to a brighter, lighter and thinner, the side light type CCFL backlight becomes the mainstream of the LCD TV backlight.

Electroluminescence (EL) backlight light weight thin body, provide uniform light. Its power consumption is very low, the required operating voltage of 80 ~ 100Vac, the supply voltage of the inverter can be converted to 5/12/24Vdc input AC output. But EL backlight with limited service life (average lifetime in the 50% luminance conditions for 3000 to 5000 hours, the service life of the higher brightness levels will be greatly shortened, therefore, EL) back lighting ideal with inverter allows the output voltage and frequency increases with EL lamp aging, effective use life so as to extend the back lighting light EL display.

LED backlight life than EL long (over 5000 hours), and the use of DC voltage, usually used in small monochrome display, such as telephone, remote control, microwave oven, air conditioning, instrumentation, stereo audio equipment etc.. LED backlight and CCFL backlight are basically the same in structure, the main difference is that LED is a point light source, and CCFL is the line light source.

With LED backlight LCD TV, the main purpose is to improve the image quality, especially color saturation, LED backlight display technology can achieve wide color gamut, for liquid crystal display device display defect color number is insufficient, so that it can achieve even more than Adobe RGB and NTSC color standard, can be achieved more than 100% NTSC ratio, which launched SONY LCD TV panels using LED backlight, with particular emphasis on red and green performance, compared with the previous method can display more realistic color.

At the same time, because the plane light source characteristics of LED, the LED backlight can achieve color and color subarea CCFL than the adjustment function, in order to achieve more accurate color reduction, in order to meet the needs of print and graphic design work, dynamic adjustment can make the picture in display different images, and brightness the contrast can be dynamically modified to achieve better image quality.

At present, most of the LCD TV with LED backlight, consumers in the purchase, can also be more inclined to choose the LED backlight. From the actual picture, we can see that the use of LED backlight LCD TV in the body design is more frivolous, in terms of color quality should be more beautiful, more energy-efficient. Many industry insiders predict, LED backlight LCD TV will be a core direction of the future development of flat-panel tvs.