LED backlight: market prospects considerable cost of light efficiency need to work together to break through

As one of the most important parts of LCD, backlight has been developing rapidly in recent years. Which LED (light-emitting diode) backlight market share is gradually increasing. In notebooks, monitors and televisions and other products, the original has been using CCFL (cold cathode fluorescent lamp) backlight, starting in 2008, notebook and display products in the use of LED backlight continues to expand. Statistics show that in the first quarter of 2009, LED backlight shipments are 8 times the same period in 2008. At the same time in the CCFL dominate the field of LCD TV, with the launch of the first Hisense LED backlight TV, the domestic market LED backlight TV products have sprung up in the market.

LED poses threat to CCFL

Since 2008, LED backlight gradually into industrialization, market share continues to expand. From the beginning of the notebook computer, and now applied to monitors, LCD TV, LED backlight products continue to emerge, increasing market share.

Wang Gang, vice president of the Central Institute of BOE Technology Group believes that, compared with CCFL backlight, LED backlight has many advantages, especially it is of great significance in the aspect of environmental protection, therefore, reduce the cost, with the expansion of the market, great influence on the development of industry of LED backlight CCFL backlight, CCFL might eventually replaced by LED out of the market.

3M (China) optical large screen business development manager Du Guanglei in an interview with the China Electronics News reporter, said, LED technology maturity and popularity will become a new driving force for the growth of the LCD industry. "From a consumer perspective will create a new selling point and application of liquid crystal display, thereby stimulating consumer demand; from the producer level and LED will promote technological upgrading and industrial transformation, and then continue to attract talent and capital investment. "Blocking guanlei think.

Compared with the cold cathode lamp, LED has many advantages. The first is the energy efficiency, the efficiency of the cold cathode lamp tube is about 60lm/W, and the current commercial LED efficiency has reached two times the value of the sample in the laboratory can be doubled. Secondly, LED will bring great changes in the mechanical design of the backlight. Because LED has small volume and light direction, can greatly reduce the traditional backlight light guide plate thickness, even without the light guide plate.

In addition, the mercury in the cold cathode lamp tube is a material with high recovery cost and great harm to the environment. From an environmental point of view, LED gradually replace the cold cathode lamp will also be an inevitable result. LED applications may bring disruptive changes to the backlight. As early as 5 years ago, 3M began to use the company's core technology platform, the development of LED can give full play to the characteristics of optical and mechanical systems. LED to the LCD display is just beginning to change, then we will wait and see. "Blocking optitek said.

LED backlight source is insufficient

Although LED backlight obvious advantages, but still need to improve. Shenzhen Diguang Electronics Co. Ltd technical director, senior engineer Su Zunhui believes that manufacturing and packaging technology of LED, especially the large size CCFL backlight is relatively mature enough, in the performance of the LED manufacturers for technical requirements of the backlight source LED is not very clear, especially domestic manufacturers. From the packaging point of view, and now LED packaging is more suitable for lighting, but not to adapt to the requirements of the backlight source of light mixing distance. Commercialization of LED still exist luminous efficiency is not high, the color gamut and the contradiction between light efficiency, we must make a breakthrough, while the price of LED is also higher. "Su Zunhui stressed.

CCFL backlight has been in the dominant position of the backlight. Wang Gang said that from the medium size display products such as notebooks, monitors, to large-size products such as LCD TV, CCFL backlight has been the largest share of backlight products. At present, in the large-size backlight, CCFL backlight because of its low cost and mature technology, occupy most of the market. At the same time, the major manufacturers have also added a new technology in the CCFL backlight, add vitality to it, such as scanning backlight, dynamic backlight, etc.. With the addition of new technology, the quality of liquid crystal display is improved and the power consumption is reduced. Wang Gang said.

Chen Hesheng, general manager of Anhui steady run photoelectric Co., Ltd. also believes that the current mainstream of large-size backlight technology and products are still CCFL. LED application in the light efficiency, cost, heat and other aspects of the promotion of obstacles.

Wang Gang said that although the development prospects of LED backlight promising, but LED light source technology is still not perfect at this stage. Including cost, light efficiency, brightness uniformity control and other technical problems need to be improved. Wang Gang believes that LED is a point light source, different from the line light source CCFL. Applied to the backlight of the LED, the need to pay particular attention to the treatment of optical homogeneity. In order to emphasize the uniformity of light, each LED luminous brightness characteristics, in the selection also requires consistency. In addition, if there is a life of LED in the end, it will affect the light uniformity, so we must ensure that all LED have long life. Such a strict selection, so that the cost of rising LED backlight.

However, the good development potential of LED technology makes the industry spare no effort to overcome the above problems. With the continuous improvement of LED light source technology, there are more and more liquid crystal display products using LED technology.

Upstream and downstream with the food market cake"

At present, the domestic LCD upstream supporting the factory is not particularly large, if the establishment of a new liquid crystal production line, it will be