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.

“Methods, systems, and apparatus, including computer programs encoded on computer storage media, for under-display fingerprint sensor timing control are disclosed.”— U.S. Patent No. 11,978,277 source

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.