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oled/microled/Laser display technology, which is the most value layout?
- Jul 25, 2017 -

In the high generation LCD panel production line layout in China has been passively followed by the initiative, the 10.5 generation line of investment in the global LCD panel industry to create a new competitive landscape. However, today's display technology in addition to the mainstream TFT-LCD, there are OLED, qled, printing display, Micro LED, laser display technology.

Guan Xudong, professor of the Department of Microelectronics at Peking University School of Information Technology, pointed out that to guard against the possibility of liquid crystal by other display technology, but also to strengthen forward-looking technology research and development, focus on non-liquid crystal display technology. So, which one is the most worthy of the Chinese layout of the future display technology?

OLED technology has been supported by the state

By the upstream high generation LCD panel production line of the impact, in the past two years, the big screen became the trend of television market development, the current domestic 55-inch has become the mainstream color TV, but also in the 65-inch market. According to forecasts, the 2018 65-inch LCD TV may account for the entire television market around 8.7%, and by 2020, 70-inch LCD TV accounted for 10%.

In the face of large-scale television products tuyere, global panel companies scramble to layout ultra-high generation LCD panel production line (10 generation and above). In the Beijing-Oriental and huaxing photovoltaic investment in the construction of two more than 10-generation panel production line, Foxconn, LGD, Huico, CEC and other enterprises also began to layout ultra-high-generation LCD panel production line. According to statistics, the world or will have 8 or more 10-generation LCD panel production line on the agenda.

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Compared with the LCD production line, although the domestic ultra-high-generation OLED production line is still vacant, but the domestic panel manufacturers have already begun to develop printing OLED technology. TCL Research Institute Senior consultant Zhu Changchang explained that the small size OLED with the steam plating process is good, but to enlarge the size of OLED product ratio is low, the price is too high, Samsung has given up. Using a printing process to make oleds can reduce costs. So as early as in 2012, TCL Group vice president and Dean of the Research institute Shaolin at home first put forward, printing display is a breakthrough in large-scale OLED display technology bottlenecks in an important direction.

2014, Guangdong Provincial Science and Technology department approved the establishment of the industry giants as the core, supplemented by the university's top intellectual resources of Guangdong Province printing display Technology Innovation Alliance, and then formed a printing OLED display technology public research and development platform, and the establishment of Guangdong Poly-Hua Printing display technology Co.

Moreover, China has developed the printing OLED technology as one of the key support projects in the "Thirteen-Five" national Key research and Development program, and the printing OLED technology has been included in the drafting of the national new material project.

2016, Guangdong Poly-Hua Printing display technology Co., Ltd. (Tcl's huaxing photoelectric company, Tianma Microelectronics Co., Ltd. with the United States DuPont, Japan Sumitomo Chemical, Nissan Chemical and the United States Ortiz and other enterprises to sign a strategic cooperation agreement, the latter will support the poly-China in the printing of OLED technology development materials and process requirements, tailor-made for poly-China-related research and development equipment.

Zhu Changchang pointed out that huaxing photoelectric, Guangzhou New Horizons photoelectric and Fuzhou University jointly tackling the printing OLED, has made 31 inch FHD printing OLED samples. Now gathers in Guangzhou City Science City's workshop has been covered well, is entering the equipment debugging stage, probably August end Test line can get through.

Laser display technology in China is comparable to that of foreign countries

Whether it is printing OLED technology research and development, or high generation LCD panel production line investment, mainly in the upstream panel manufacturers, and laser display layout is downstream machine manufacturers.

Over the past two or three years, laser TV into the development of Fast lane, in addition to Hisense, Changhong and other color TV brands to accelerate the layout, millet, Sony, see Still, Micro whale, etc. also in the active layout of laser television.

Shiliyun, professor of physics at the University of Science and Technology of China, said in an interview that China's laser display technology is comparable with that of foreign countries, each has its own advantages. Abroad in the drive chip, semiconductor light source on the development of a relatively front, and China in the optical engine, dissipation spots, optical efficiency technology has a certain advantage.

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According to the reporter understand, Hisense Laser optical engine 100% independent research and development design, 70% whole machine cost in their hands. Changhong also accelerates the layout of the laser TV industry chain. June 15, Changhong built an annual production capacity of 150,000 laser optical machines, integrated standard laser display production line, accelerate the development of Changhong laser display industry. And now the industry is speeding up the development of panchromatic laser projection technology, by using the narrow-spectrum red-green-blue three-color laser to synthesize white light, in the true sense of the realization of laser "full-color" display. In this case, China's manufacturers are actively promoting the "panchromatic" Laser display technology applications, it is revealed that next year Hisense will launch a panchromatic laser TV.

Micro led two or three years of attention

In addition to LCD, print display, laser display, there are many enterprises are also developing qled, Micro LED, holographic display technology, including micro led this two or three years of concern, mainly by Apple mergers and acquisitions Luxvue company. According to China Optical optoelectronics Industry Association LCD branch of the Executive vice chairman and Secretary-General Liang revealed that Apple has been micro led research and development team to Taiwan, where Apple has a Qualcomm acquisition from the 4.5-generation TFT production line, the factory line is mainly used for panel analysis certification and micro LED research and development.

In fact, China's research institutions have long started to develop micro LED technology. As early as 2006, the Hong Kong University of Science and Technology team adopted passive-drive, using flip-chip technology to integrate micro-led array. 2010 Hong Kong University of Science and Technology Z. Liu's team used the red and green blue led wafer to produce 360ppi micro LED display chip respectively. And the team of the Hong Kong University of Science and Technology, where Z. J. Liu is located, is working together with the Sun Yat-sen group to increase the resolution of the micro led to 1700ppi, narrowing the pixel distance to 12 microns.

Most of our led manufacturers of large-scale revenue, pay more attention to the LED commercial market itself, but for like Micro led this forward-looking technology investment less. 2015, Liard launched the Ultra Micro P0.9 mm HD seamless wall, which is the first in the market to achieve a production of less than 1 mm spacing LED display, but mainly in the field of indoor monitoring. The technical team of Jiangsu Zhong Chuang Chip Technology Co., Ltd. has made breakthroughs in the design and manufacture of gallium nitride micro led micro-display chip, demonstrated the CMOS-driven high brightness, low-power green Micro LED display micro-display chip, the resolution reached 1000ppi, medium-range brightness reached 50000cd/m2.

Experts argue that liquid crystal should "protect" and "keep"

From the domestic enterprise display technology layout can be seen, now the situation has been different from the CRT to the plate when only the LCD and PDP two strong hegemony of the era, but into the Warring States Period, LCD, OLED, printing display, qled, Micro led, laser display and other technologies "significant" future generations.

Faced with so many display technology, how should our country plan to layout, so that oneself in the big screen era to maintain the leading edge?

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China Optical optoelectronics Industry Association LCD branch of Deputy Secretary-General Hu Chunming pointed out that China's current most competitive or LCD, 10.5 or 11 generation line of the first construction made our industry seize the opportunity to adapt to the television and other large-scale display of the demand, in the short and medium term to protect our country in this field.

Guan Xudong also pointed out that the current Chinese mainland display industry's biggest advantage is the large-scale panel manufacturing, Beijing-Orient and Huaxing photoelectric has their own investment in more than a 10.5-generation LCD panel production line, achieved the advantages of the first, and they also have a high generation of ultra-high-level LCD panel production line, and South Korean manufacturers do not seem to be willing to vote, so China to do strong display industry first of all to break through is the large size LCD panel, "Shou" live has been achieved.

But now many people worry about the LCD panel overcapacity, how to digest these capacity is placed in front of the panel manufacturers a difficult problem, so at present the most urgent is to provide large-scale LCD panel to the sea mouth. Now the large size LCD panel also can not see the new application market, so Liang said, will be large size and high-resolution combination, seize the Japanese 2020 Olympic Games to use 8K broadcast opportunities, and promote the domestic radio and television opened 4K, 8K Channel, this is our large-scale LCD panel only way out.

Shanyi, a researcher at the Electronic Information Industry Institute in Sadie, also pointed out that China has said goodbye to the lack of screen times, now how to use the downstream reaction panel industry is very critical, for example, drive 4K, 8K application development, let downstream applications drive upstream large size, high-resolution panel development.

At the same time, China should continue to improve the industry chain matching, breakthrough core technology. At present our country already faces the patent interrogation. It is understood that the German Merck, which provides the display material, has already made a patent card, but it is not directly facing the panel manufacturer, but implies that the terminal manufacturer should not use the patented LCD panel.

Dare to "overtake" in the emerging display

Large size OLED is relative to large size liquid crystal. Shang, Deputy Secretary-General of China Electronic Materials Industry Association, pointed out that OLED with higher contrast, higher color saturation and surface display, in the alternative part of the small and medium-sized display market advantages, high-end large-size TV shows the market to maintain a rapid annual growth rate, but because the cost is the LCD panel costs 2.3 times times, in G8. More than 5 generations of production lines and many other problems need to be solved, so expect to 2022, large-scale OLED The market share of TV is still a relatively small share. 

At present, the capacity to produce large-scale OLED only LGD a, but OLED TV manufacturers have expanded from the original 5 to this year's 13, the market is also gradually expanding, China should be like small and medium-sized size AMOLED follow LGD large-scale OLED technology line?

In an interview, Shanyi said LGD using WRGB technology to launch a large-scale OLED panel, from the display effect and light and thin point of view, more competitive, but the cost is still high, difficult and mainstream TFT-LCD competition, so with or not with the LGD technical line is worth the domestic panel enterprises to consider a problem. And the printing technology used in large-scale OLED display manufacturing is the direction of industry efforts, theoretically can reduce costs, the current volume production will take a relatively long time.

Domestic companies such as poly-China are studying and trying to overcome the ink life, inkjet printing equipment and other difficult problems. Zhu Changchang said, now printing OLED formation of China, South Korea, Japan and the United States four camps, the Korean camp to Samsung, LG-oriented, Japan to joled mainly, the United States focused on printing OLED equipment. China's printing OLED started earlier, basic and international at the same starting line, printing OLED is an important opportunity for China to overtake the corners.

Printing OLED as a new technology, the risk of unilateral investment is relatively large, Zhu Changchang that should be supported by the state, the local enterprises, through tripartite cooperation, the focus of national strength, in a relatively short period of time to break through the printing OLED technology bottlenecks, maintain international advanced level, and even corners overtaking.

The laser television has the same advantage in the big size area, but the contrast is poor because the projection is susceptible to the external light. In the opinion of Ouyang Zhongcan, academician of CAs, at present, the majority of products introduced by the manufacturers are laser fluorescent powder technology (ALPD), which is a blue laser excitation phosphor production of white light technology, to solve the projection bulb life problem, but it is similar to the LED technology, difficult to overcome the laser fluorescent powder technology has speckle problem. This is also the present development of laser display problems.

But Shiliyun said that the laser display in the market has the advantage of more than 75 inches, and China in the dissipation of spots, optical efficiency technology has a certain advantage, should be the laser display technology to practical and market-oriented. Now drive chip, semiconductor light source and foreign have a certain gap, need to further localization. At the same time, laser display key technology, such as dissipation spots, color management technology, but also to further practical and product.

Similarly, Micro led has some potential in the field of large size. Micro led set low power consumption, high brightness, ultra-high resolution and color saturation, fast reaction, super power, long life, high efficiency, and so on, compared with LCD and OLED, Micro led brightness and color saturation of the advantage is very obvious. Meng Menglong, Director of research and Development at Lehman, pointed out that micro led interior screen brightness can reach 1000~2000nit, LCD screen brightness can only reach hundreds of NIT. In addition, the micro LED can be used with three primary colors or four-color scheme, color area coverage more wide, show better results.

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Friend Tatsu Photoelectric Chairman Peng pointed out that micro LED is a good technology, it combines the TFT backplane and led solid-state light-emitting These two very mature technology, the cost is also significantly reduced. If the micro led can enter the market in a few years early, it may become the mainstream of the market, but now the market has a very big challenge.

Micro LED technology is facing many technical challenges, led inside Research assistant manager Simon Yang said that micro led manufacturing has a number of key technologies, including large-scale transfer technology in micro LED manufacturing is the most difficult part, and drive IC, color conversion, testing equipment, uniformity and other technical bottlenecks to be broken.

In an interview, Guan Xudong pointed out that China should pay attention to non-liquid crystal display technology, strengthen the forward-looking technology research and development, especially micro led. "Do not underestimate the micro LEDs, although it is still difficult to see clearly the potential threat to liquid crystals, but this possibility exists. Like the TFT technology, just began to obscure. China from the last century 80 's began to study the TFT technology, when no one was concerned, to the 90 's also very small, but look at today's display panel industry, has become the world of TFT. ”

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