Since Samsung introduced the Micro LED TV at CES 2018 of this year, the industry generally believes that the new competitive landscape in the future in the field of view will become the battlefield between OLED and LED Micro.
Samsung LED TV with saying 146 inch “The Wall” and Micro LED TV 175 inches by LG at IFA are to indicate that competition has started, some even think that Micro LED will tread the future of home entertainment.
To begin this topic, you first need to first know the Micro LED technology.
It is a miniaturization of arrays of conventional inorganic LEDs and each LED pixel has dimensions equal to 10 micron, it can be addressed and illuminated independently. In short, you can see that the LED size is reduced to the order of 10 micron, they are directly connected on the TFT drive substrate to obtain an accurate control of the brightness of each pixel, so as to realize an image display.
The reason why the Micro LED is preferred by many people in the industry, It resides in the fact that it is the same OLED self-luminous display technology with numerous advantages.
The Micro LED has high brightness, Very high resolution and color saturation, high luminous efficiency. It is not affected by water vapor, oxygen or high temperatures, then it presents obvious advantages in terms of stability, duration and operating temperature.
The Micro LED technology allows the LED unit to be lower than 100 micron
That said bluntly, Micro LED has a power consumption of approximately 10% LCD and 50% dell’ YOU ARE. Another comparison with the OLED, to obtain the same brightness of the display requires only about 10% the coated surface. At the same time, can reach 30 la del OLED folds luminanza, and a resolution of 1500PPI (pixel density), compared with an OLED panel of’ Apple Watch which is 300ppi are five times as much.
At the moment, OLED has been favored by many producers and consumers, the reason is that many important indicators of the OLED are greater than the liquid crystal display.
Un MicroLED vs. OLED is obviously better: from the comparison of various data, It has the option to replace the current mass display technology.
This new technology is so promising, it's no wonder that Apple, Samsung, Hon's, LG Display, Oculus and other manufacturers are busy with the layout.
Apple has worked hard in the field of LED display technology Micro and required a large number of related patents. The Apple patent portfolio covering a number of key technology areas related to the display of these LEDs and is designed to address all major technical bottlenecks affecting technology commercialization. From the point of view patent, investing in Apple's R & D focuses primarily on technology transfer, assembly and interconnection and beyond 40 patents have been applied to these technologies.
Quest’anno Apple Watch Serie 4 still uses an OLED screen does not mean that it can be so for later.
It must be said that The Wall TV Samsung Micro LED technology has a price not less than $ 300.000 It is a symptom of an immature technology
The technical process of Micro LED is currently the most urgent problem to be solved. For instance the most complex part is the single LED withdraw the size of 10 um from the wafer and place it in a matrix with spacing 100 um with an error of 1 one.
The matrix structure of monochromatic LEDs can be achieved, but it requires an array of RGB and the need to incorporate hundreds of thousands of pieces of LED arrays. At the same time, the expenditure of chromatic aberration of the LED is also a bottleneck that hinders technology. Just consider that the future will have 8K resolution 7680×4320 pixels equivalent to approximately 100.000.000 individual LEDs
Apple's lead in the race of microLED, according to Yole
After the completion of its latest report, “Micro LED Displays 2018”, The company Yole Développement market research draws conclusions on the state, announcing the imminent end of OLEDs that are not able to compete in terms of brightness and efficiency.
The Yole analysts observe that the micro LED technology could match or exceed OLEDs for most of the key display attributes, but the yield is still and is destined to die for an inherently complex technology. The production of a 4K resolution display involves the assembly and the connection of 25 million microLED the size of bacteria large without a single error, with a positioning accuracy equal to or less than 1 μm.
This alone seems daunting challenge, some assembly technologies offer yields close to 99,99% o al 99,999%, and the efficiency of small molds approaches or exceeds that of the OLED , observes Yole.
The MOCVD reactors suppliers also have credible roadmaps to provide tools with the capabilities and properties of the costs of which the industry needs. Even the color conversion and other aspects are progressing.
From demonstrations to consumer exhibitions
A growing number of companies are showing their prototypes. Most are microdisplays on CMOS substrate, but the number of display prototypes “great” Is increasing, whether they use discrete microdriver as X-Celeprint or substrate in thin-film transistor (TFT) as AUO and Playnitride.
Many are still focusing on the realization of their first prototype, but the more advanced they realized that bring technology from level demo running on consumer-level products may require more effort than expected. Moreover, drive the microLED is more complex and use of OLEDs in polycrystalline silicon substrate (LTPS) or TFT oxide at low temperature standard may not be as simple as expected.
The demonstration of a Sony Full HD TV microLED 55 “al CES 2012, more than six years ago, It was the first exposure for microLED display and generated much excitement. Since Apple acquired in Luxvue 2014, many leading companies such as Facebook, Google, Samsung, LG and Intel have entered the game through considerable internal developments, acquisitions, such as those of MLED and Elux, or investments in startups like Aledia.
Apple leads the game
Yole has carefully considered the views of the patents before he could establish Apple as an unexpected leader in technologies microLED. The analysis of the activity of microLED Apple patent shows that the company has substantially stopped in the deposit 2015. This is a surprising discovery in light of the fact that the consumer electronics giant has retained a large project team constantly and spent hundreds of millions of dollars a year on developing microLED . A more careful analysis has, however, raised the name of a nominee can socetà used by Apple to continue to file patents and demonstrates that the company is still advancing key aspects of technology microLED.
Despite a later start compared to pioneers such as Sony or Sharp, Apple's portfolio is one of the most complete and comprehensive covering all relevant critical technologies to microLED. The company has the most advanced and still one of the best positioned to bring high-volume products on the market microLED, Analysts say the Yole.
The challenges persist
To maintain its image as a premium brand, Apple can not afford to present a product with a highly differentiated technology so that it is far from flawless. It requires high volumes, which makes the creation of the most challenging supply chain than any other company. The company has no previous experience in the production and display, because of its need for secrecy, It must develop virtually all internally, duplicating technologies and infrastructure that others have the possibility to outsource.
The Yole report provides a detailed overview of key players and analyzes the challenges associated with creating a chain of efficient microLED display supply, including groups and front-end display.
Reduce production costs
Dozens of technologies have been developed for the assembly of microLED. The range of cost and complexity can be stunning. The cost analysis then allows companies to restrict the process parameters up to economically realistic windows and identify effective strategies for cost reduction.
The MICROLED companies need to understand the cost targets for each application and work backwards, making choices and developing process of each stage in such a way that is adapted to cover the costs. The processes are not able to provide the right savings disappear. If no one is able to provide the right economies, the opportunity never materializes, it will mean that the MICROLED technology is entering the valley of death between technological development, industrialization and commercialization.
With the improvement of technology, reduction pathways exist credible cost microLED to compete in the high-end segment of various applications such as TV, augmented reality and virtual (WITH / VR) and wearable devices. With the correct approach, the cost of assembly could become a minor contribution.
Microdisplay per AR e head-up display (SKIN) will be the first commercial applications, followed by smartwatch. TV and smartphone might follow from 3-5 years, conclude Yole.
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