V-technology has released of FHM(Fine Hybrid Mask) which can realize UHD of 738ppi in Finetech Japan 2017 held on 5th.
The existing FMM is made by braiding and welding. However, this method is not only difficult to manufacture, but also has difficulty in realizing a high resolution due to the structural limitations of mask such as pattern (hole) and deflection due to its own weight.