Progress in a variety of new technologies CCFL will be replaced by LED

CCFL cold cathode tube is one of the key components in the liquid crystal display, and it is also one of the key components which affect the color saturation. The research and development of new technology to replace the CCFL has become the focus of the development of LCD technology.

LED industry information analysis platform LED inside, said: the proportion of computers in 2008 is expected to use LED backlight will gradually increase, the demand for notebook PCs with white LED will continue to grow. According to the Wang Gang Research Institute said: Although the BOE LED back light source because of its cost problem temporarily can not completely replace CCFL, but LED is currently in the industry believe that the backlight is the best choice for the future is most likely to replace the traditional CCFL backlight, and the new technology of OLED, HCFL and CNT also joined the backlight competitors team.

South Korea LGP company's external electrode structure of the EEFL backlight products with a cost advantage. EEFL backlight technology external electrode structure, through the traditional CCFL tube internal electrode is arranged in the external tube, to avoid the traditional mercury by CCFL and metal electrode reaction to form compounds, mercury consumption is reduced, the lamp life is greatly prolonged, up to the level of close to 100 thousand hours (traditional CCFL back light up up to 50 thousand -6 million hours), simultaneously can reduce the usage of mercury vapor, to reduce the pollution to the environment environmental protection requirements. At present, there are some Korean manufacturers LGP and China's Taiwan region, some manufacturers of products to the market.

South Korea's Samsung and OSRAM in Germany also developed the plane FFL backlight technology, which is characterized by a single light source, has the advantages of low cost, long life, high brightness, because of its light structure, good uniformity, optical design easy, simple structure, easy processing and automation. Combined with the Xe gas discharge technology, the color saturation can reach more than 90%. The disadvantage is that large power consumption, production yield is still low, resulting in the current cost is still higher than CCFL, generally only for large screen applications, the existing products to the market.

Toshiba Co has developed a local control technology of LED backlight, technical principle is the vertical display is divided into 8 parts, the horizontal is divided into 12 parts, a total of 96 blocks, and can control the brightness of each block, by adjusting the brightness of each block to control the output power, can reduce power consumption.

Hybrid backlight technology Sharp Co of Japan developed the appropriate join red LED lights in the traditional CCFL backlight, CCFL backlight makes up the deficiency in the red spectrum of the LCD product color saturation increased to a level close to 100%.

The development of the traditional light source PHILPS HCFL thermal cathode backlight technology is also popular attention. The primary advantage is to reduce the use of HCFL backlight lamp number, on the same screen size, the need to use traditional CCFL backlight lamp 12 -16, relative HCFL only 11, the main reason is that the efficiency of HCFL is higher than that of CCFL. The number of lamps to reduce, which means that the number of inverters to reduce the overall cost of backlight down. In addition, HCFL also has the characteristics of low driving voltage and high color saturation. However, compared to CCFL, HCFL tube diameter is thicker than the lack of light does not apply to highlight the product application.

Samsung, LG, Motorola, SONY and other companies actively develop CNT technology based on carbon nanotube backlight technology. The characteristics of CNT backlight technology is the use of vacuum discharge device, high brightness, low cost, energy saving, light, simple manufacture, and good environmental stability, but in the light of light and driving is still not mature, about the brightness uniformity can reach about 79%.

Source: CCIA