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The 2018 Micro LEDforum, sponsored by the LED Research Center (LEDinside), ended in July 12th. This time it was mainly for the six major bottlenecks in the Micro LED process and invited experts from various fields to share it. In the large amount of transfer, this time it was specially invited to Uniqarta, SelfArray, eLux, QMAT, KIMM and other manufacturers to discuss the characteristics of different transfer technology and the potential of future technology.

2018 Micro LEDforum scene

The LEDinside research coordinator mentioned in the lecture that there are different technical features of a variety of massive transfer techniques, and the display of different sizes may correspond to different huge transfer schemes for different sizes of displays. Therefore, the feasibility of exploring all kinds of huge transfer technology will bring more opportunities for technological breakthroughs for the whole industry.

Uniqarta, a US new venture, mentioned in the meeting that the speed and efficiency of Uniqarta's massive transfer scheme will be greatly improved compared to the traditional pick and place transfer technology. The current pick and place can only be transferred from 10 thousand to 25 thousand hours per hour, and it takes about 2 to 15 weeks to make a display. But the laser transfer technology developed by Uniqarta can transfer through a single laser beam or multiple laser beams. The Uniqarta executive Ronn Kliger has a transfer speed through the film in the speech process, a LED size of 130x160 micron. About 14 million can be transferred per hour.

Uniqatar executes long Ronn Kliger

Another representative of laser transfer is QMAT, and QMAT transfer technology uses BAR (Beam-Addressed Release) to use a laser beam to transfer Micro LED from the original substrate fast and large-scale to the target substrate. In particular, in order to ensure zero ppm defects and high output targets in the massive transfer process, the QMAT also proposes a PL/EL detection scheme, before the transfer is detected and confirmed to ensure that the transferred Micro LED is a good product, which will reduce the time for subsequent maintenance and the cost of processing.

QMAX executes long Francois.J.Henley

In addition to the laser transfer scheme, another new American company, SelfArray, also shows the way of directional self - assembly to deal with transfer through the anti magnetic floating method. The method is to cover the LED appearance first with a layer of pyrolytic graphite film, and put it on the vibrating magnetic platform. Under the guidance of the magnetic field, the LED will be arranged quickly to the location. SelfArray executive Clinton Ballinger also demonstrated the technology through the film in the meeting with 350x350 micron size LED technology, and indicated that the company is designing LED with a volume of less than 150 microns, and will be tested in the future. If the technology is ripe, it will take only a few minutes to make a 4K TV in the future.

SelfArray executes long Clinton Ballinger

The roller rotation technology is the original patent technology of the South Korean Institute of Mechanical Research (KIMM). Using the roller method, the TFT element and the LED element are "transcribed" to the substrate, and the extensible active matrix Micro LED (AMLED) panel is finally formed. The huge transfer efficiency of the roller rotation technology is about 10 thousand times faster than the traditional working process.

Jae-Hyun Kim, director of the micro technology application department of the South Korean Mechanical Research Institute (KIMM)

In this seminar, the chief technology officer of eLux, Paul Schuele, was invited to come. ELux is mainly focused on the assembly and positioning of fluid. The eLux patent proposed that the method of fluid assembly is to use the interface of the molten solder capillary, so that the fluid suspension liquid is used as a medium to connect the electrode mechanically and electrically during the assembly period. It can quickly capture and align the Micro LED to the solder joint, which is a low-cost and high speed assembly method.

Paul Schuele, chief technology officer of eLux

Last year Hon Hai, through its subsidiary CyberNet, became the largest shareholder in eLux. Now eLux has made a breakthrough in Micro LED technology and will also assist Hon Hai to distribute Micro LED in the future. ELux also said to LEDinside that in the future it will cooperate with Hon Hai Group's glory in the backlight, and the back board will join hands with another hung Haizi company. ELux also revealed that the next stage will move towards the RGB display and will take at least three years to enter the large display screen.

Huang Bingkai, managing director of micro light emitting diode

Finally, accumulating technology is the only driver for this workshop to drive IC, by the micro - emitting diode division Huang Bingkai manager in the way of TOP DOWN, with the HDR10 specification to bring out the advantage of micro/mini-LED on the LED display. Compared to the traditional SMD LED, micro/mini-LED has the advantages of wide viewing angle, high luminous efficiency and higher pixel density, it is still necessary to enable IC to drive one hundred percent micro/mini-LED features, for example, true 16-bit PWM can improve the contrast to 25000:1 level. High integrated drive IC integrates more channels and other peripheral IC can correspond to point spacing, and higher pixel density. For the detection of the bad point in the production of micro/mini-LED display, AOI can only detect whether the LED has omission, whether there is a successful counterposition and whether the grain is damaged, but it is not easy to judge whether the pad has the right joint. The LED error detection capabilities provided by the accumulation of technology SHARE-I/O can make up for the shortage of AOI. The exclusive error prediction function can be used to judge the LED grain that will be invalid before the factory burn-in is shipped, and help to maintain early maintenance and reduce the cost of subsequent maintenance.

LEDinside 2018 Micro LED second generation display technology market report - 3Q18 Micro LED transfer, drive, backboard and application requirements

LEDinside's latest report, "2018 Micro LED generation technology market report - 3Q18 Micro LED transfer, drive, backboard and application requirements", explores the relative relationship between various display specifications and huge transfer, drive and backplane technology. Because the features of the display are different from the specifications, it is necessary to correspond to the application characteristics of the different display products, whether it is huge transfer, moving, and backboard. Therefore, according to the display products in different fields, the future direction of future development may be dominated by different technology manufacturers.

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