International LED and semiconductor lighting exhibition held in Shanghai City

Recently, international LED and semiconductor lighting exhibition (LED Expo 2005) and FPD China 2005 in Shanghai at the same time. According to the organizers of the Shanghai optoelectronics industry association secretary general Tang Guoqing introduction, this is the first LED and FPD joint exhibition. LCD module backlight, is one of the most popular applications in the past two years LED.

LED has been very mature application in the mobile phone color LCD backlight, LCD backlight and as a large size, still just started. At the exhibition site to see, the Japanese company as well as, China and the United States and Taiwan Polytron Technologies Inc are presented on the application of large size LCD backlight.

"We show 15.1 inches of the sample, the power consumption of 60 watts, the screen thickness of only 20 cm. Stanley can do 37 inches." Shanghai Stanley Electric Co., Ltd. Sales Department of Lin Yi said, the 15.1 inch LCD backlight display is the use of RGB tricolor LED, a total of using a total of 196 red, 392 green, 196 blue LED." The system adopts a plurality of wedge-shaped LGP ladder arrangement, the uniform light distribution, more importantly, the screen can do so only 20 cm in thickness, this is the biggest characteristic of Stanley products.

According to Yu Hua Polytron Technologies Inc marketing director Yang Xiaofeng said that the 7 inch LCD display on birch module backlight, mainly used in car satellite navigation display.

The traditional LCD backlight is CCFL (cold cathode fluorescent lamp), compared with LED backlight source has the advantages of good color reduction, energy saving, long life, low pollution and so on. Stanley staff said, LED backlight can be more vivid colors, color gamut of 108%. Because LED has these advantages, more and more manufacturers begin to develop large size LED backlight. According to the China institute director Professor Fang Zhilie light, currently has LED backlight Agilent and MITSUBISHI cooperation made 34 inch LCD TV, SONY and Samsung launched LED backlight LCD TV 40 inches and 46 inches.

To contact in the exhibition industry generally believes that the LCD backlight LED applied to the large size of the technology is facing brightness, heat, light distribution and other problems, but the main obstacle to enter the LED of large size LCD backlight is the price. According to Stanley Lin Wi introduction, the 15.1 inch LED backlight will be mass production in the middle of next year, the price of about $150, more expensive than the traditional CCFL about 5 times. He believes that LED backlight is mainly positioned in the high-end LCD TV products, in order to replace the traditional backlight, at least 5 years.

Yu Hua Yang Xiaofeng also believes that the main bottleneck is the cost of LED backlight. Currently, the cost of 7 inch LED backlight source and traditional backlight costs almost, below 7 inches is cheaper LED. As chip prices continue to decline, LED prices also showed a downward trend. He is optimistic that this year to next year LED backlight will have a big breakthrough.

Professor Fang Zhilie believes that from the beginning of this year will enter the large screen LED backlight and CCFL competitive period, estimated to around 2008 LED backlight in the application of large size LCD screen will dominate.

Lighting is still the big market

From the short term, LED as a large size LCD backlight, must be a hot spot. But in the long run, home lighting will be LED greater application market." Deng Siguang's view of the United States Gree, represents the views of the majority of the industry.

At the show to see the situation is also consistent with the above judgment. Exhibitors, most of them are LED packaging applications, the vast majority of applications to display products to landscape lighting, urban lighting, decorative lamps and display based. Comparison of the new bright spot is used for automobile taillight LED. Shanghai Jinqiao morning Photoelectric Technology Co., Ltd. will be equipped with a LED taillights Passat parked at the exhibition site. According to reports, LED for car taillights, the biggest advantage is that the LED response speed is very fast, compared with the traditional lamp millisecond response speed, the response speed of the LED is nanosecond, which will greatly improve traffic safety.

"LED backlight application is in the stage of steady growth. Lighting will be a new growth point for LED." Yang Xiaofeng's theory. Now LED street lamp, table lamp, lighting has a certain range of applications. However, the price is still the biggest obstacle. Deng Siguang made it clear that, now that the lighting is a bit too early." He believes that from a technical point of view to solve the problem as a large area of the light source LED light spread, but also a certain amount of time. In addition, the price factor is also crucial.

According to the staff of the Shanghai blue light Polytron Technologies Inc, the company is developing a home lamp holder, using three watts of LED three, the price of ordinary halogen lamp and a difference of about 10 times. He believes that the main reason for the high price of LED high power LED chip manufacturers are very small, only two or three. Once chip prices fell, LED is expected to enter the home market.

The sales manager of Huizhou Huagang photoelectric Parts Co. Ltd. Qian Jiangtao believes, LED spread to the family lighting, at least 5 to 10 years. Now the market is a very short time for white light, basically 500-800 hours, can not show the superiority of LED. In addition, the current LED is not the best energy-saving light source. According to him, the current light efficiency of LED can only reach an average of 25 lumens per watt, only about twice as high as incandescent lamps, and light bulbs per watt than the lumen of the 80 light effect is low. In the long run, LED light