Walk the independent claim. Qualcomm's grant US10733409B2, "Hybrid capacitive and ultrasonic sensing" (issued August 4, 2020), carries an unusually long inventor list and the CPC tags G06K 9/0002 and G06F 21/32 — fingerprint acquisition and biometric authentication. It is a granted patent, and its subject is not a single sensor but the pairing of two.
The element that does the work is the hybrid architecture. Capacitive fingerprint sensing is fast and cheap but struggles through thick display stacks and with wet or dry fingers; ultrasonic sensing reads a deeper, more spoof-resistant image of the ridge structure but is slower and costlier. The claim's contribution is combining them so the system can fall back or fuse — using the capacitive path for speed and the ultrasonic path for depth and security.
What it reads on is the under-display biometric reader, the feature that let phones drop the physical home button. Qualcomm has long supplied ultrasonic sensors to the Android ecosystem, and a hybrid claim positions the company across both of the dominant under-display modalities rather than betting on one.
Granted, not merely published — the distinction matters here because the hybrid-sensing space is crowded with applications that never issued. US10733409B2 is an enforceable grant, which makes it a live consideration for anyone building a multi-modal under-display reader.
Scope discipline: the claim protects the specific fusion of capacitive and ultrasonic sensing as recited, not the idea of biometric authentication or either modality in isolation. A competitor using purely optical under-display sensing, as several phone makers do, operates in a different art and would not read on this claim.
The strategic read for a landscape analyst is that Qualcomm is hedging at the architecture level. By claiming the hybrid, it captures designs that try to get the best of both worlds — and that hedge is the kind of structural position that pays off as the under-display category matures.