Plessey developed a process to deposit native green and blue microLEDs on the same wafer

UK-based GaN-On-Si MicroLED microdisplay developer Plessey Semiconductor announced that it managed to deposit native blue and green microLEDs on the same wafer. Plessey’s new patented process forms microLEDs that exhibit high current density operation and long operational lifetime.

Plessey native green and blue microLEDs wafer photo

Plessey said that to achieve this important milestone they had to overcome several challenges - including a magnesium memory effect, diffusion from the p-type cladding of the lower junction into the upper junction and the requirement for the precise tuning of the thermal budget during the growth of the second junction to prevent indium phase separation in the blue active region.

VerLASE Technologies announces new technologies for massively parallel assembly of microLED dies and films

VerLASE logoUS-based VerLASE Technologies announced that it is developing technologies for massively parallel assembly of microLED dies or films. The company has already files for multiple patents for its new technology.

VerLASE says that it is using practical methods and well-proven semiconductor and MEMs industry methods and existing tools. The company's technology will enable "deterministic, massively parallel transfers of microdie, with provisions that allow selective repair". The methods involve techniques used daily in Ink-Jet Printing but is not printing per se.

The US and China are leading the Micro-LED industry patent landscape

The Korea Intellectual Property Office released a report on the Micro LED industry IP situation - in which it says that Korean display companies may lose their current industry lead as they account for less than 15% of all micro LED display patent applications.

The leading countries in Micro-LED IP are China and the United States - which together account for more than 50% of all applications.

San'an is expanding its Micro-LED capabilities and facilities

San'an Optoelectronics logoIn September 2018 we reported that China-based San'an Optoelectronics is gearing up to setup its first micro-LED epitaxial wafer and chip production line in Q1 2019, and in early 2019 it was reported that San'n plans to start sampling Micro LED chips as early as January 2019.

In a new press release, San'an announced that it is advancing with its Micro-LED R&D and capacity investment, and the company has filed for 27 patents and has signed several key partnerships. San'an also says that it has "expanded its manufacturing capabilities and facilities for micro-LED production".

Apple, Samsung and LG filed dozens of Micro-LED patents in Korea

The Korea Herald reports that Apple and its subsidiary LuxVue Technology applied for over 30 Micro-LED patents in Korea in the past 10 years. As Apple's Micro-LED project is progressing, the company aims to prevent its competitors in Korea (mainly Samsung and LGD) from using its key Micro-LED technology.

Luxvue MicroLED patent drawing

According to the report, Apple applied for 11 patents directly, while LuxVue applied for 23 patents. LuxVue was acquired by Apple in 2014. Apple applied for patents that related to the Micro-LED chip structure, the pick-and-place process and the driving system.

Optovate developed a technology to transfer micro-LEDs to an aligned optical array

UK-based Optovate announced that it has developed a technology that enables multiple microLEDs transferred in parallel from a wafer to a substrate to be aligned in one step with a precision optical array.

Micro-optic array and visualized light cones (2018, Optovate)

Optovate says that this technology is protected in a portfolio of 20 granted and pending patents dating from 2008. The company is now looking for display partners to commercialize its technology.

Yole analyzes the Micro-LED patent landscape, sees complex legal battles ahead

Yole Developpement published an interesting article discussing the patent landscape of the MicroLED industry. As of today, almost 1,500 MicroLED patents were filed by 125 companies and organization. The overall corpus has an average of 3.2 years, which makes these patents quite new.

MicroLED patent families by company (January 2018, Yole)

The initial micro-LED patents, filed at around 2000-2001, were mostly by a variety of research institutes, by large companies such as Sony and Sharp but also by startups such as Luxvue (acquired by Apple). The activity in this field is still led mostly by startups, and with the exception of Sony and Sharp, mature display makers are relative latecomers.

NanoGaN purchases micro-LED applicable quasi photonic crystal patents from Luxtaltek

NanoGaN (a subsidiary of UK-based Eipwafer foundry and substrate maker IQE) announced that it has purchased a portfolio of 54 quasi photonic crystals patents from Taiwan's Luxtaltek for $500,000.

NanoGaN says that these newly acquired patents have applications in optical components - including Micro-LED displays. Other possible applications are in the fields of vertical-cavity surface-emitting lasers (VCSELs), modulators, silicon photonics, fiber-optic systems, biosensors and more. IQE believes that due to its existing in-house NIL capability, the firm is well positioned to commercialize the new technology.