Taiwan's Industrial Technology Research Institute (ITRI) demonstrated a 16.7" microLED display "module" that was produced by directly mass transferring micro-LED chips onto a PCB backplane.
ITRI developed its own mass transfer tech, and uses microLEDs provided by PlayNitride, PCB backplanes provided by Unimicron and drivers and assembly by Macroblock. The 16.7" display is made by tiling 15 modules 6x10 cm each (45,000 LEDs). The microLEDs are <100um in pitch.
ITRI says that its technology is unique as there's no use of temporal substrates -which could cut production costs by 20%. The main challenge however is the PCB backplane and it tendency to distort.