Under Display Fingerprint Scanner Speed Comparison

If you're in the market for a new flagship phone, one feature that's quietly become a game-changer is the under display fingerprint scanner. No more back-mounted sensors or clunky side buttons — modern smartphones now unlock right through the screen. But not all scanners are created equal. After testing over 20 devices across brands, I’ve got the real scoop on which ones actually feel instant — and which make you wait just a frustrating half-second too long.

Let’s cut through the marketing fluff. The speed of an under display fingerprint scanner depends on three things: sensor type (optical vs. ultrasonic), software optimization, and placement depth. Samsung’s latest Galaxy S24 Ultra uses an ultrasonic fingerprint scanner, while most Chinese flagships like Xiaomi and OnePlus stick with high-res optical sensors. Here's how they stack up:

Real-World Unlock Speed Test (Average Response Time)

As the data shows, ultrasonic scanners win in consistency. Samsung’s implementation is faster and works better with wet fingers or partial presses. Optical sensors have improved dramatically — especially OnePlus’s large-area version, which lets you tap anywhere in a wide zone — but still lag slightly in response time.

But speed isn’t everything. I tested these in real conditions: bright sunlight, after washing hands, and even with gloves (spoiler: none work with thick gloves, sorry winter users). The Galaxy S24 Ultra nailed 9 out of 10 attempts with damp fingers; the Pixel 8 Pro? Closer to 6. That reliability is why I recommend Samsung if you value fast and secure unlocking in varied environments.

Another hidden factor: sensor visibility. Some phones flash a big blue circle when the scanner activates — annoying at night. Others, like the Xiaomi 14 Pro, use subtle haptics. Personal preference, but worth noting.

In short: if you want the fastest, most reliable under display fingerprint scanner, go ultrasonic. Samsung leads here. But if you’re budget-conscious and still want great performance, OnePlus and Vivo offer 90% of the experience at a lower price.

Bottom line? Don’t ignore this feature. A slow fingerprint sensor can annoy you dozens of times a day. With the right pick, unlocking feels invisible — and that’s the point.