RE: Buy & sell call23 Feb 2019 09:40
see also the RNS on 4th Jan - very exciting stuff going on:
Plessey Semiconductors and Nanoco Technologies today announced a partnership to shrink the pixel size of monolithic microLED displays using Nanoco's cadmium free quantum dot (CFQD® quantum dots) semiconductor nanoparticle technology. Using its existing monolithic process, Plessey will integrate the Nanoco CFQD® quantum dots into selected regions of blue LED wafers to add red and green light. This shrinks the smallest practical pixel size from today's 30µm to just 4µm, a reduction of 87%. The process will enable the production of smaller, higher-resolution, microLED displays in applications such as AR/VR devices, watches, and mobile devices, while enhancing both colour rendition and energy efficiency.
For pixels of 30µm or greater, colour conversion is currently performed by adding phosphors to the blue die. However, since the smallest phosphor particle is around 30µm, the efficiency of colour conversion deteriorates as the pixel size shrinks. Nanoco's CFQD® quantum dot technology overcomes this limitation while facilitating efficient, compact device packaging.
"Quantum dots offer the best solution for today's emerging display requirements. The nano-sized emitters with narrow band emission make them a suitable solution for Plessey's microLED display roadmap, which will see pixels being driven down to 4µm in size by 2019,"