Plessey Attacks Monilithic MicroLED Target

Plessey Semiconductor said that it expects to be the first to market with a monolithic microLED based display based on GaN-on-Silicon.

Plessey also said that it has started an “extensive” licensing programme that will see the company license out its GaN-on-Silicon expertise to microLED manufacturers in line with its new business strategy of becoming a technology platform provider.

Plessey believes that GaN-on-Silicon is the only technology platform capable of addressing all of the challenges involved with manufacturing microLED displays in high volumes and cost-effectively. ” Michael LeGoff, CEO, Plessey Semiconductor said:

“We made the decision to become a technology platform provider in order to get our technology out to the widest possible manufacturing base to meet this growing demand. By being the first to market with a monolithic microLED display we will be demonstrating our expertise and the ability to access our proven turn-key solution, enabling manufacturers to ramp up the development and production of microLED displays to address emerging applications.”

One of the main challenges involved with manufacturing microLED displays using a non-monolithic approach is the placement of LED chips onto a CMOS backplane, currently achieved using pick and place equipment. This involves the individual placement of every LED on a pitch of less than 50μm, requiring new and expensive equipment that is subject to productivity issues. As the pixel density of displays increases and pitch reduces, pick and place becomes less feasible both commercially and technically.

Moving to a monolithic process removes the need for chip placement and will enable smaller and higher resolution displays for a range of applications, including virtual reality (VR), augmented reality (AR), and head-up displays. As the only monolithic solution commercially available, Plessey’s technology doesn’t require pick and place equipment and isn’t subject to the associated productivity issues.

A fully monolithic approach also supports the integration of the standard CMOS circuitry necessary for driving microLED displays, as well as the close integration of high performance graphic processing units (GPUs), all of which can be carried out using standard CMOS manufacturing methods. By solving all of the major challenges, licensees gain instant access to a technology platform that is ready for volume production.

Dr Keith Strickland, CTO, Plessey Semiconductor said:

“GaN-on-Silicon is the only technology that makes sense in terms of scalability and performance. Itoffers better thermal conductivity than Sapphire and higher luminosity than OLED, which is why this technology is widely acknowledged to be the only one that can deliver high resolution, high luminance displays.”

Analyst Comment

We met with Plessey at CES and will have a more detailed report in our CES coverage. The disadvantage of the monolithic approach is that you can’t make big displays, so the applications are likely to be limited to headsets. (BR)