Micro LED two application in TV wall display first into production

The next generation of display technology of micro light emitting diode (Micro LED) since the dawn light industry, cross industry chain series is speeding, but also accelerate the application of layout in Dachang drive, especially in large size TV wall indoor display, AR/VR display applications such as the most potential. Now Micro LED display applications have any new progress, and the market transition technology can help to shorten the so-called Micro LED development process, has become the focus of public attention.

Micro LED two application in TV wall display first into production

SONY launched a large size mosaic type display "CLEDIS at the beginning of this year" (Crystal LED Integrated Structure), Micro LED display applications open innovation pattern, wide application field and attracted a lot of industry investment development, Taiwan factory not fall behind. Taiwan ITRI "micro intelligent application system research group deputy leader Dr. Fang Yanxiang pointed out that the TV wall (Video wall) is the first Micro LED imported products, currently LED driver IC plant and PCB plant science and technology accumulation of Xinxing Electronic and semiconductor technology has been in the factory of neptunium, Taiwan Industry Research Institute to establish the trial production line Micro, LED splicing type TV wall Quartet cooperation in the development of the sapphire substrate without display applications.

However, Micro LED of each process link is a challenge, so it is not easy. Fang Yanxiang said, the key lies in the Micro LED crystal wafer very uniform, but the technology is very difficult, at present the high uniformity of wafer by NP record executive development, has now completed the single color test piece, this year is expected to be completed before the end of November and the other. Micro LED in the sapphire substrate thickness was approximately 3 m to 5 m, not using the traditional point by a joint way, so the station is responsible for the massive transfer of ITRI technology will be transferred to Micro LED PCB in the Xinxing grain, but also because of the traditional PCB plate roughness (roughness) was solved by the large plate the factory adjustment process, the difficulty is very high; the IC driver is responsible for the accumulation of LED Micro range for current development, including other materials, detection and other details have technical hurdles to be excluded.

"We put out the RGB full color board, it is the world in addition to SONY, second with no mosaic made of sapphire substrate Micro LED display products." Fang Yanxiang explains that the TV wall display station and three factory jointly developed ITRI, LED grain size slightly larger than the SONY CLEDIS, about falling between 50 m to 100 m, spacing (pitch) is smaller than CLEDIS, at about 800 m; the size of 10cm x 10cm module, the main lock 130 inches above the indoor application, visualneeds free mosaic. It is understood that at present, foreign customers order, is expected to June 2018 into mass production after the success, will be formally put into production.

Micro LED panel - Taiwan prototype developed by ITRI, around to protect the element.

About AR/VR display application potential, Micro LED will become the mainstream display light source

In addition to the large size TV wall display, the other Micro LED application key Taiwan ITRI focus is augmented reality (AR) and virtual reality (VR) display applications. Micro LED with high brightness, high efficiency and low power consumption, high resolution and color saturation, long service life and other characteristics, technology to better advantage than OLED, LCD display in the AR/VR field, is expected to replace the two become the future mainstream display light source technology. Oculus and Facebook's, kangdexin photoelectric, last year has been through the acquisition of Micro LED display technology company, to accelerate the deployment of AR/VR field layout.

The AR/VR display will do for media future AI era of artificial intelligence, also became more and more thin, Micro LED near panel can integrate various sensors, achieve multiple effects." Fang Yanxiang once again mentioned Micro LED micro assembly with integrated sensor (micro assembly) technical characteristics, coupled with high resolution, high brightness and other advantages, it is very difficult to compare OLED and LCD. In addition, 2020 AR/VR on the market value of 1200 million scale market forecast, with the value of development.

He pointed out that the AR/VR display will reach 8K4K resolution Micro LED in the future, it will be more than 30 million monochrome grain number, if the RGB is nearly 100 million color calculation. However, Fang Yanxiang believes should be based on quantum dots monochrome Micro LED plus (QD) color conversion material, can relatively improve the chances of success. The main reason in addition to yield issue RGB three itself, and after the transfer may have other problems, Micro LED uniformity is difficult to control, easy to produce and effect of color leakage, plus a nonlinear current, driving conditions it is difficult to control the color and brightness, so do not recommend the use of RGB three color Micro LED, good the rate of color conversion to single color combination of quantum materials will be relatively high.

However, the appropriate color conversion material is not with extreme ease because the market is relatively mature, the color conversion material containing cadmium, the efficiency is higher, but the cadmium materials by EU regulation, after Chinese, with other countries / regions may also implement the control, so in cadmium free materials R & D, but the efficiency is poor, color conversion good efficiency have continued to test development. The Taiwan Micro LED monochrome ITRI resolution up to qHD (960 x 540) level, the minimum size of LED can be reduced to 5 m.

The Taiwan 0.55 inch panel Micro / LED monochrome display technology, three years without obvious decline

Fang Yanxiang said, Taiwan is ITRI series manufacturers at home and abroad construction industry chain development of AR/VR display applications and launched the test, expected by the end of 2018, up to 4K2K pixel density of about 1000 PPI, 2019 reached 8K4K, the pixel density is about 2500 PPI, all using monochromatic Micro material to realize quantum LED collocation