[EE]Quantum Dots to Shrink MicroLED Display Pixels
Nanoco Technologies and Plessey Semiconductors have partnered 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 gallium nitride (GaN)-on-silicon monolithic process, Plessey will integrate the CFQD quantum dots into selected regions of blue LED wafers to add red and green light, shrinking the smallest practical pixel size from today’s 30 µm to 4 µm, 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 color rendition and energy efficiency.
Lee said the quantum dots are applied onto microLED arrays using an inkjet process, for which the two companies will file a joint patent. “Quantum dots offer the best solution for today’s emerging display requirements," Lee said. "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 4 µm in size in 2019.”
Interesting that they claim such a great size reduction and going from 30um to 4um. Samsung already demo'ed 10um size MicroLEDs and others have already demo'ed smaller, so the tech can already reach these sizes. Though Samsung's mass produced MicroLED size is closer to 30um because they both have no need to go smaller and if they go smaller there will be a lot of blank space between pixels.
Really the most important thing I see from this article is the inkjet process technology used to print the MicroLED in a similar manner as LG and JOLED use to product OLED panels. Though as Mand12 pointed out, this still has an issue of being printed on massive pieces of silicon which cost a lot more than other panel types.
For VR I can see this being a big improvement. VR is where we need these ridiculous pixel densities and self emissive displays are great for VR. Piecing together many entire wafers to make a large display seems expensive but you could probably make enough headsets out of one wafer to make them somewhat affordable.
Huh. Really is the better part of a decade for this to make it's way to the private sector, then. Saw 8 micron pixels with 2 micron subpixels using quantum dots in around 2011 in microdisplays for government use. You don't want to know how much they cost...
Won't be useful for TVs, since you're talking about 50 wafers for a 75" display.