In recent years, more and more LCD screens for consumer electronics have begun to adopt LEDs as backlights. From mobile phones and PDAs to notebook computers and LCD TVs, the application range is wider and wider, and the screen size is getting larger and larger. The pulling effect is also getting stronger and stronger, and the speed of the most popular LED-backlit TV is surprising. Therefore, on April 20-21, 2010, Shanghai Everbright International Hotel was established by the National Semiconductor Lighting Engineering R&D and Industry Alliance, “2010 Shanghai International New Light Source & New Energy Lighting Forumâ€, specially set up by Hong Kong Applied Science and Technology Research Institute. Co-organized the "New Light Source Display Development" feature summit. At the meeting, various parties and experts conducted in-depth discussions on the topic of "the status and prospects of the large-size LED backlight industry". The backlight market is growing rapidly. The LCD TV with LED as the backlight is light and portable, with delicate images, mercury-free environmental protection, high brightness and high color gamut. Therefore, with the increasing acceptance of the market, the international market Mainstream display manufacturers are focusing on the LED backlight from the mobile phone, GPS navigator, portable DVD player, digital photo frame and other small and medium-sized LCD backlight market, and further promoted to the larger LCD TV field, but also for the LED industry Bigger business opportunities. In this regard, market research firm Display Search research director Zhang Bing predicts that the global LED-backlit LCD TV sales in 2009 will be about 4.24 million units, accounting for only 3% of the entire LCD TV market, but sales will soar to 156 million units in 2014. Left and right, the market share of the entire LCD TV will also soar to 64%. In addition, LED backlights have been used in the notebook market for many years, and the market penetration rate has been quite high. In 2009, it has reached 61%, and in 2010 it will reach 84%. In 2012, notebook computers will stop using CCFL as a backlight. The penetration rate of LEDs in liquid crystal displays will also increase to 16.8% in 2010. Li Xiaofang, president of Skyworth Group Display Technology Division, also predicted that LED backlight LCD TVs have quickly entered the consumer's field of vision. The ratio of LCD TVs using LED backlights in the first quarter of 2010 is about 10%, and will grow rapidly in the fourth quarter of 2010. To 30%, it is expected that there will be opportunities to exceed CCFL backlight shipments in 2012. Due to the rapid growth of LED-backlit TVs, LEDs have been greatly boosted, and backlights are becoming one of the mainstream applications for the development of the LED industry.
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TV manufacturers actively layout
In 2004, Sony took the lead in commercializing LED backlight technology, introducing a 23-inch LCD display with LED backlight and a 40- and 46-inch LCD TV. Although these products have the drawbacks of high power consumption, large heat generation and high price, the advantages of LED in display quality have been fully reflected and have begun to attract industry attention. Since 2009, with the rapid increase of the LED backlight market, domestic TV manufacturers have seen it as a good opportunity to adjust the industrial structure and narrow the gap with the international display giants. According to Qiao Mingsheng, research and development manager of Hisense Electric Modules Co., Ltd., the 42-inch ultra-thin LED LCD TV TLM42T08GP independently developed by Hisense in July 2008 was launched in batches, becoming the third company in the world to realize the mass-marketing of LED-backlit TVs. Li Xiaofang, president of Skyworth Group Display Technology Division, said that for Chinese TV companies, low-cost LCD panels + low-cost LED backlights will be a development opportunity, and should be used as a breakthrough in strategic development, and increase R&D investment. The opportunity for CCFL-LCD TV to transform into LED-LCD TV will use technology advancement to drive down costs and narrow the gap with the world's first-line brands.
In this context, many domestic TV manufacturers are actively deploying in the relevant industry chain, and start to improve the supply chain system: strengthen strategic partnership with important material suppliers; plan to expand upstream to the supply chain, establish a perfect supply chain system Localization. At present, the vertical integration of TV manufacturers to LED companies is increasing.
Backlight technology
The rapid expansion of the LED-backlit TV market has indeed demonstrated broad market opportunities. However, it should also be noted that there are still many technical problems to overcome in this product, so the technology update is quite fast.
The first thing that needs to be faced is the thermal effect problem that is often difficult to solve. According to Yan Jun, deputy director of the technology of BOE Tea Valley, the direct-type LED large-size backlight has a certain amount of light-mixing height, which has certain help for heat dissipation, and will make a heat dissipation plate on the entire LED large board to achieve heat dissipation. effect. Since the power of the LED lamp is relatively high now, and a certain amount of energy is released in the form of heat, the backlight has strict requirements on thermal reliability, and the overheating affects the performance of the circuit component, reduces the luminous efficiency of the LED lamp, and causes wrinkles in the film material. The phenomenon causes the backlight mura to be poor, the local temperature of the backlight is overheated, and the liquid crystal is unstable when the module is subjected to the aging test. Now, the large-size LED side-illuminated backlights that are mass-produced are required to reduce the number of light bars, increase the power of the lamps, and require higher heat dissipation for the LED light bars. The current technology is that the light bar uses an aluminum substrate, and the light bar requires a heat dissipation strip to be assembled on the backlight. The structure should be matched with better heat dissipation. As the light bar is reduced, the number of corresponding lamps is reduced, and the brightness of the lamp is increased. It is a challenge to the prior art. Now LED manufacturers are researching LED lamp modules. This technology is to package multiple chips under one module and heat-dissipate them accordingly. The light is mixed in the Lightbar module to achieve the best state, and the ceramic package is used for better heat dissipation. .
Dr. Cai Zhenrong from the ASTRI of Hong Kong also said that in terms of technology development, white LEDs of blue LED+RG phosphors are becoming a compromise solution for LCD TV backlights due to their better color gamut and moderate price. The side backlight benefits from the light guide plate yield, the heat dissipation cost is reduced, and the LED efficiency is improved. The side backlight has become one of the important backlight modes. Side-backlit dynamic backlight control technology and direct-lit 2D regional dynamic backlight control technology have become important development directions in the future.
Qiao Mingsheng believes that one of the keys to the development of LCD TVs is the development of LED backlight control technology. The development goal of the LED backlight control function is increasingly clear, that is, to overcome or improve the inherent problems of liquid crystal display: such as dark gray level light leakage problem, liquid crystal display tailing phenomenon, as well as improving image quality, improving color gamut, energy saving and environmental protection. Among various LED backlight control algorithms, the partition dynamic control algorithm can solve the two shortcomings of the above liquid crystal display well, so it is the choice and the general trend.
In short, the future development trend of display technology is high definition, large picture, high picture quality (fast response, high contrast, etc.), energy saving and environmental protection, high color gamut, ultra-thin, intelligent, cheap, etc. Simply put, it is "energy saving" The uniformity of image quality, beauty and environmental protection, LED backlight liquid crystal display technology is in line with this development trend. 