AM-OLED towards large-scale and LCD TV battle for the 2012 outcome

Since October 2000, SANYO motor in Yokohama International Exhibition for the first time display shows 5.2 inches AM-OLED products, compared with other TFT-LCD panel size, AM-OLED with its superior display quality and light features stunning venue, the Japanese government sector be described as the "next generation of dream display"; at the same time by South Korea and Taiwan region flat panel display (Flat PanEL Display) manufacturer's attention, have invested in R & D related technology. However, the stability and lifetime of organic material itself (Life Time), has been deeply troubled manufacturers, which has not reached the degree of commercialization of the consumer can accept, plus low temperature polycrystalline silicon (LTPS) thin film transistor (TFT) complex process and low yield, but also makes it less competitive in price however, AM-OLED exhibited by the "next generation display technology" charm, still can not stop.

AM-OLED break through the encirclement towards large-scale

After years of effort, as shown in Table 1, AM-OLED advantage in the light, AM-LCD is still far behind, in perspective, reaction speed and contrast characteristics, shows the advantages of AM-OLED in the animation display materials, stability and life has been criticized, in the new materials continue to improve also, consumers has reached the acceptable degree, the biggest challenge for the future will be in the development of large-scale production technology, but will be extended by application to reach a portable product to 40 inch class consumer TV market, and remain competitive in price, AM-OLED is only possible in the thin flat panel display market competition for a space for one person.

Table 1, AM-OLED and AM-LCD panel characteristics comparison

Therefore, in the long-term investment in R & D and manufacturers unbearable can see breakthrough, and they beat a retreat occasion, in 2007, Sony pioneered the contrast 1000000:1 and life up to 20000 hours of the 11 inch OLED-TV, although each market price is still $1700, but at least to the high quality of the large panel of goods of a small step, then again in 2008 to launch 27 inch and 32 inch OLED-TV grade series products, and actively make mass production layout; Samsung Group is also actively integrate technology under AM-OLED, the product line from the mobile phone to NB and other portable products, extended to 40 inch OLED-TV, contrast enhanced to 2000000:1, the color saturation has reached 130%, while the power consumption is only 75W, only half of the same level of LCD-TV, the positive degree has to compete with Sony. Reminiscent of 2002~2005, Samsung and LG LCD in the TV century large-scale war, competition will be more progress, Japan and South Korea in the OLED-TV competition, believe that we should be able to set off benefits fueling for AM-OLED industry.

Where are the key technical bottlenecks?

Currently in the mainstream of mass production technology, in the face of large-scale trend, there are two bottlenecks need to be overcome, and the relevant solutions are also actively proposed and developed. (a) the bottleneck of the development of current production technology bottlenecks, the first tempering technology of crystallization, because there are LTPS process, then collocation laser tempering (ELA) technology to produce silicon crystallization, although you can produce TFT components with good electronic conduction rate, but limited to the Multi-Scan scan range and limit effect of the production efficiency is not high, the current can only be applied in the following 3.5G years of professional production line, to make greater breakthroughs. The second is the color pattern forming technology, the RGB patterns are formed using thermal evaporation and net cover (Shadow Mask) to achieve the purpose of Pixelize, but as long as the process temperature above 40 degrees Celsius, it will cause Shadow to Mask deformation, especially the panel inch is large (> 30 inches) because the tension between, and soon faced scrapped, not only caused the loss of production cost, it is the future of the large-scale production of AM-OLED, will cause great development bottleneck. In addition, the molecular OLED polymerization of Polymer after the arrangement will form many branches of molecular chain, will not only affect the luminous efficiency, more will cause uneven phenomenon; and in the production process, how to avoid in the removal of the solvent is removed from the oven, due to uneven cooling, the surface plate yield is not good that is the mainstream technology bottleneck at this stage must face and overcome.

(two) coping scheme

In order to overcome the bottleneck of the development of the organic materials development, manufacturers in addition to higher stability, the crystallization process technology and color pattern formation technology is proposed to improve the solution; such as Japan and South Korea manufacturers to use vapor deposition (Deposition) to form Metal Oxide to replace the low-temperature polysilicon (LTPS) process, Taiwan manufacturers have to SDC (Sublimation Deposition & Crystallization Non-scan) and tempering crystallization technique, to solve the present problems of large-scale production, although these are still under development in the crystallization process are not conduction rate such as LTPS, and each Pixel electrical uneven problem, but as long as the use of existing mature a-TFT production line, can be the production technology push up to 5G or more, or very attractive. Secondly, color pattern forming technology, manufacturers have also put forward the following solutions, such as the use of white OLED color collocation (Color Filter), Nozzle filter or Printing atmospheric transfer technology to replace the net cover (Shadow Mask) the problem of deformation; however, these new developments in technology, are also facing after plating OLED well, how to avoid contact with water vapor in the atmosphere caused by OLED Lifet