Mass transfer refers to the processes used to move very large numbers of microscopic LEDs — often tens of micrometres wide — from the substrate they were grown on to a display backplane, all at once rather than one at a time. The dominant approaches captured in this patent dataset include micro transfer printing using elastomer stamps, adhesion-switching pick-up heads, and engineered donor substrates that release LEDs cleanly. Because microLED displays can require moving millions of individual emitters, the transfer step is widely regarded as the main manufacturing bottleneck standing between lab demonstrations and mass-market displays.

The ranking covers 100 assignees, and it is heavily front-loaded: the single leading assignee holds 285 of the 1,300 records in scope, and the top 5 assignees combined account for 40.8% of all records. That concentration includes university research groups alongside specialist printing-technology companies and diversified materials firms, reflecting the field’s origins in academic stretchable-electronics research as much as in commercial display manufacturing. Anyone assessing freedom-to-operate should expect dense prior art from this small group on core printing and stamp mechanics specifically.

No — filing peaked in 2021 at 101 records and had fallen to 25 by 2024, a 75% decline over that three-year span, the most recent period with complete enough data to compare fairly. Figures for 2025 and 2026 are still filling in because publication typically lags filing by around 18 months, so it would be premature to read those years as confirming a continued slide. The honest read is that the core mechanical approaches to mass transfer may be reaching claim maturity, with assignees consolidating existing positions rather than filing new foundational claims.