Comparison of LED backlight and EL and CCFL backlight technologies in characteristics and fields

Although EL backlight does not gain more people's attention as LED backlight due to its own characteristics and performance disadvantages, it is also one of the important members of the backlight family. Compared with LED backlight and CCFL backlight, EL backlight What are the characteristics of the source, what is its technical performance, and what are their main application areas? This article discusses the above series of issues. The EL device is a device that directly converts electrical energy into light energy. The EL backlight is a novel thin-film cold light source, which excites the fluorescent powder sandwiched between two transparent electrodes through an alternating electric field to emit light. The figure is a schematic diagram of an EL backlight LCD module. Figure Schematic diagram of EL backlight LCD module EL has the advantages of ultra-thin, low energy consumption, soft and uniform light emission, does not produce ultraviolet rays, has high visibility in smoke and fog environments, has high water resistance, vibration resistance and can be bent at will And other characteristics, have great development prospects. The electroluminescence (EL) backlight body is thin and light, and provides uniform light. Its power consumption is very low, the required working voltage is AC 80-100V, and the inverter that provides the working voltage can convert 5V, 12V, 24V DC input into AC output. However, the EL backlight has a limited service life. The average service life is 3000-5000 hours under the condition of 50% brightness, and the service life will be greatly shortened at a higher brightness level. EL back lighting is more suitable for small reflective LCD applications such as watches, digital desk clocks and monochrome PDAs that require extremely weak lighting in order to be used in dim or dim light conditions. However, the shortcomings of low efficiency, low brightness and short life make it unsuitable for applications such as large LCD backlighting required by notebook computers and flat-panel desktop monitors. Since EL devices require higher AC voltage to drive, and their life is short, the power consumption is generally a few milliwatts per square centimeter, and the brightness is tens of candela per square meter, so it is currently mostly used in small and medium LCD backlights. , Lighting instructions for instruments and membrane switches, traffic transportation and fire safety indicators, art clocks, electronic gifts and toys, advertising signs, indoor and outdoor decorative lighting and darkroom lighting. The main characteristics of EL (Electroluminescence) are as follows. ①The thickness is 0.4～1.0mm. ②The driving conditions are wide, the frequency is 60～1000Hz, and the maximum AC voltage is 150V. ③The light colors are blue-green, yellow-green and white. ④The life span is about 5000 hours. Comparative analysis of EL backlight, CCFL backlight and LED backlight technology In recent years, with the continuous development of LCD screentechnology, the application fields of liquid crystal displays, especially color displays, are also expanding. Driven by the LCD screenmarket, the backlight industry has shown a prosperous scene. As the core component of LCD TVs, the performance of the backlight will directly affect the display quality of the LCD. The cost of the backlight also occupies 3-5% of the LCD module, and the power consumed accounts for 75% of the module. It is a very important component in the LCD module. Currently, there are three types of backlight sources: EL, CCFL, and LED, which can be divided into side-light type and direct-light type according to different light source distribution positions. As LCD modules continue to develop in the direction of being brighter, lighter, and thinner, edge-lit CCFL backlights have become the mainstream of the development of LCD TV backlights. The electroluminescence (EL) backlight body is thin and light, providing uniform light. Its power consumption is very low, the required working voltage is 80～100Vac, the inverter that provides the working voltage can change the input of 5/12/24Vdc into AC output. However, the EL backlight has a limited service life (the average service life is 3000-5000 hours under the condition of 50% brightness, and the service life will be greatly shortened at a higher brightness level). Therefore, the ideal inverter for EL back lighting The device allows the output voltage and frequency to increase with the aging of the EL bulb, thereby prolonging the effective life of the display using the EL back-illuminated light source. The service life of LED backlight is longer than EL (more than 5000 hours), and it uses DC voltage. It is usually applied to small monochromatic displays, such as telephones, remote controls, microwave ovens, air conditioners, instrumentation, stereo audio equipment, etc. The structure of the LED backlight and the CCFL backlight are basically the same. The main difference is that the LED is a point light source, while the CCFL is a line light source. The main purpose of using LED as the backlight source of LCD TVs is to improve the image quality, especially in terms of color saturation. The LED backlight technology display screen can achieve a wide enough color gamut to make up for the lack of color display of the LCD device. It can meet or exceed the requirements of AdobeRGB and NTSC color standards, and can reach NTSCratio above 100%. Among them, Sony introduced LCD TV panels with LED backlights, with special emphasis on bright red and dark green performance, which can display more realistic colors than previous methods. At the same time, because of the flat light source characteristics of the LED, the LED backlight can also realize the sub-regional color and chromaticity adjustment function that CCFL cannot match, so as to achieve more accurate color reproduction to meet the needs of graphic publishing and graphic design work. The dynamic adjustment of the picture can make the brightness and contrast of different pictures be dynamically corrected to achieve better picture quality. At present, most LCD TVs use LED backlights, and consumers can also be more inclined to choose LED backlights when purchasing. From the actual picture, we can also see that the LCD TV with LED backlight is lighter and thinner in body design, and it is also more colorful and more energy-efficient in terms of picture quality and color. Many industry insiders predict that LED backlight LCD TVs will be a core direction for the development of flat-panel TVs in the future. The three types of backlight products are important backlight products that have appeared in different stages of the development of LCD screens, reflecting the development trend of backlight panels. Our company Xingyuhe Electronics keeps up with the pace of market development and develops and manufactures many types of LED backlight panels. We sincerely invite Everyone buys.

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