Recently released Apple watch third generation to use Micro-LED and Apple Taiwan Longtan base exposure news, so Micro-LED attention once again warming, the industry began to predict MicroLED industry ahead of arrival, said OLED has not turned to be beaten Caught by surprise. Today on-line Jun to tell you about how we should see Micro-LED development status quo.
Although Micro-LED has been favored by the world's largest enterprises, and began to enter the march, the technology in the specifications are also more benefits than the LCD, and even picture quality can be comparable with the OLED, but the development of the technology at this stage is not with the news speculation That is the case, but it is difficult.
As a veteran in the LED industry, today on the Micro-LED from the LED point of view, it is far away from us?
First, flip the LED chip itself has not yet taken the road
For Micro-LED, it is more suitable for flip-chip LED, because flip-chip LED does not require metal wire, LED chip can reduce the gap between each other, so more satisfied Micro-LED display small size, easy to miniaturization needs.
But the current mainstream lighting display LED field, flip chip there are still process, yield, cost and other bottlenecks in the traditional use of the proportion of the LED industry are still in a relatively weak market share stage. Of course, flip-chip LED industry in the use of the scale of growth is growing, more and more involved enterprises, but the time sooner or later, but from the flip LED to flip MicroLED there is still some distance to go.
Second, LED solid crystal yield control difficult
To the current mature LED light bar process, for example, in the production of a LED light bar there are dead pixels and other failures occurred, let alone a monitor to be embedded in millions of micro-LED. While the LCD and OLED have been batch operations, yield performance is relatively good.
Third, LED scale on the transfer
Future MicroLED show the difficulty lies in the embedded LED process is not easy to take large quantities of operations, especially RGB 3-color LED is more difficult than monochrome. But the future with the LED stickers, printing and other technical methods to enhance, it is conducive to Micro LED display into the mass production stage.
Fourth, full color
At present, Micro-LED colorization method is mainly RGB three-color LED method, UV / blue LED + light-emitting medium method and optical lens synthesis method.
RGB-LED full color display is RGB three primary colors after a certain ratio of synthetic color, which is currently widely used LED large screen method, and this is most likely to Sony's CLEDIS program. And is considered the best UV / Blu-ray LED + light-emitting medium method, the problem is more.
First of all LED, if the use of UV LED, we all know that the current UV LED luminous efficiency is very low, the product's yield costs are the problem, so online Jun that this program to achieve mass production cycle longer, let alone Quantum dots.
So the more optimistic about the blue-based quantum dots program, although the current quantum point is still in a primary stage, but now involved in quantum dot business investment more and more, and Blu-ray LED technology has been very mature, and now need to overcome is how to do small The The third optical lens synthesis method, personally considered to be primarily on the projection application.
In addition, there is a color conversion technology, personal micro-LED micro-display through the monochrome LED color conversion method is more worthwhile, because the monochrome RGB is much easier.
Fifth, the wavelength consistency, bin bin cost
Monochrome Micro-LED array through flip-chip package and driver IC can be achieved, but the RGB array needs to be redistributed red, blue, green three-color grain, you need to embed hundreds of thousands of LED grain, for the wavelength The consistency of the requirements of a higher, while the cost of bin bin is also a technical bottleneck hinder production.
Sixth, current congestion, heat accumulation and other issues
Micro-LED (<50 μm (μm)) is different from the general size (> 100μm) LED characteristics. General size LED almost no current crowding, heat accumulation and other issues, and due to lattice stress release and larger light surface and may have better efficiency and other advantages. However, the larger surface area of the Micro-LED may be due to surface defects and more large leakage path, micro-electrode to improve the series resistance, will affect the luminous efficiency.
Seventh, high cost
One of the reasons is that LED chip packaging, the existing LED display to prepare RGB LED chip, and then these chips integrated in a package, the formation of the LED as a pixel use. So need to create RGB color LED chip, and installed in a package, resulting in higher costs.
And Sony did not disclose the details of this, but according to their data show that this technology is likely to be high, although the new generation of products to reduce the PPI but still very high. In addition, there are many high-cost links, such as binding, packaging, transfer, testing and equipment.
Conclusion:
In short, Micro-LED wind is great, the technology is also very promising, but landing is not so fast. Whether the recent outgoing Apple's third-generation watch will be used, or Sony's small pitch Micro-LED display, these are currently only samples, at least not large-scale applications.
And the current OLED technology upgrade soon, the advantage is more and more obvious, more and more mature technology, coupled with the layout of the majority of production lines, once the yield increase, the price will drop linearly, this alone, MicroLED also need very A long way to go. (Text / LEDinside Skavy)