Read the portfolio, not the patent — and watch the classifications move. The under-display fingerprint grants of 2024 — Google's US11978277B2, Samsung Display's US12096677B2, and FocalTech's US11963427B2 — cluster in G06V 40/1318 and the OLED-sensing class H10K 59/65, not the G06K 9/0002 class that anchored the 2020-era grants.
The reclassification is itself a signal. When a technology's patents migrate from a generic acquisition class (G06K 9/0002) into a specific sensing class (G06V 40/1318) and a display-integration class (H10K 59/65), it reflects the field maturing — the IP is now about fingerprint sensing built into the panel, not generic image capture. The CPC home tracks the engineering reality.
Mapping the assignees across the new classes shows a familiar but evolved field. Display makers (Samsung Display, and panel-sensing specialists like FocalTech) hold the H10K 59/65 integration claims; platform owners like Google hold the control-logic claims (timing, noise filtering). The split mirrors who owns the panel versus who owns the device.
Distinguish a filing surge from a grant surge. These 2024 grants reflect filings from prior years, so the migration into the new classes was underway well before the grants issued. A classification shift visible in grants is a lagging confirmation that the field reorganized — which makes it a dependable signal of where the art settled.
White space, where the map shows it, has narrowed in the panel-integration core — the dominant display makers have claimed it densely — and sits more in the control and reliability layer (timing, noise, anti-spoof). That is where a new entrant has room, and where grants like Google's timing-control claim are staking early positions.
For a strategist, the landscape lesson is to follow the CPC migration, not just the assignee names. The under-display fingerprint map of 2024 lives in different classes than it did in 2020, and a freedom-to-operate search anchored on the old codes would miss most of the current art.