You are reading a message on your new iPhone 18 Pro, the screen goes white, and for a second the left half of the clock looks a little off. Slightly grainy, like a low resolution patch stuck in the corner. Look again and it is gone. Look at a white web page and there it is.
Your phone is fine. What you are seeing is the most interesting hardware change Apple made this year: the infrared camera that Face ID depends on now sits underneath the OLED panel in the top left corner. To let invisible light pass through the screen, Apple had to thin out the pixels above it. Most of the time you will never notice. Sometimes you will.
TechRadar’s Axel Metz flagged it this week after readers kept asking, and it has turned into one of the more common “is my iPhone broken?” threads on Reddit since the phone shipped on September 18. Here is what is going on, why Apple accepted the trade, and the one accessory mistake that can actually stop Face ID from working.
Why the corner looks different
Face ID has never been a single camera. It is a small system Apple calls TrueDepth: a dot projector that throws more than 30,000 invisible infrared dots onto your face, a flood illuminator that lights your face in infrared so it works in the dark, and an infrared camera that reads the pattern and builds a depth map. On every iPhone since the X, all of that sat in the notch and later in the pill shaped Dynamic Island, right next to the selfie camera.
On the iPhone 18 Pro, Apple split the system up. According to Dave Lee’s (Dave2D) look at the phone under a microscope, the dot projector and flood illuminator still live in the cutout beside the front camera. The infrared camera, the part that only needs to receive light, moved to the left and now hides beneath the panel. A teardown by repair firm REWA Technology confirmed the layout: the IR camera sits away from the central sensor cluster, under the OLED, near the upper left corner.
OLED pixels block light. To let enough infrared through, the part of the screen above the sensor uses a lower density pixel arrangement. Dave2D’s microscope shots show a zigzag pattern, rows of pixels alternating with zigzag gaps. Those gaps are the windows the sensor looks through.
When you will see it, and when you will not
Fewer pixels in a patch means that patch cannot render fine detail quite as cleanly as the rest of the screen. On a busy wallpaper, a dark background or a video, the difference disappears into the image. It shows up when something sharp and high contrast sits right on top of the zone. On the iPhone 18 Pro, that is usually the clock in the status bar, and only its left half, because the right half sits outside the sensor area.
Metz says he noticed it during his first session with the phone but stopped seeing it quickly. Reddit is more split. One owner wrote that they “haven’t noticed it at all.” Another sees it mainly “when the black text of the clock is sitting directly on a solid white background.” Then there are the people it genuinely bothers: one user said it is “quite distracting” and that they would rather have a larger Dynamic Island than “an obvious screen disparity.”
| Situation | How visible is the patch? |
|---|---|
| Dark mode, dark wallpaper | Practically invisible |
| Photos, video, games | Hard to spot, the image hides it |
| Colorful or busy wallpaper | Occasionally, if you know where to look |
| Black clock on a plain white app or page | Most noticeable, left half of the time looks grainy |
| Under a macro or zoom lens | Clearly visible zigzag pixel gaps |
What Apple got for the trade
Moving one sensor out of the cutout let Apple shrink the Dynamic Island. Before launch, leakers put the new island at roughly 13.5mm wide against 20.7mm on the iPhone 17 Pro, and spy shots suggested the pill was close to half its old size. Apple has not published exact dimensions, so treat those numbers as estimates, but the difference is obvious side by side.
A smaller hole in the screen is the visible win. The software win is arguably bigger: with iOS 27, the redesigned Dynamic Island can show three Live Activities at once instead of two. So the physical island got smaller while the space around it now carries more information, your ride, your timer and your game score at the same time.
Why move only the infrared camera? Because it is the easiest piece to hide. Under display selfie cameras have existed on Android phones for years, Samsung put one on the inner screen of the Galaxy Z Fold for several generations starting in 2021, and they still take noticeably soft, hazy pictures, because visible light photography is very sensitive to anything in the way. An infrared camera reading a dot pattern is far more forgiving. It does not need to produce a pretty image, it just needs to see the dots. That made it the natural first candidate, and pre-launch reporting from Korea’s ETNews said Apple was sourcing the under-screen infrared technology from Samsung.
Dave2D says he went in expecting some cost, “reduced effective range or accuracy.” He did not find any, and called Face ID on the new phone “incredible,” just as good as on the iPhone 17 Pro.
The real problem: matte and privacy screen protectors
The pixelation is cosmetic. This part is not. Dave2D found that after applying a matte screen protector, Face ID on his iPhone 18 Pro Max stopped working reliably. It makes sense once you know the setup. A frosted or etched surface is designed to scatter light so reflections look soft. That same scattering smears the infrared dot pattern on its way back to a camera that is now looking through both a screen protector and a thinned out OLED layer.
Clear protectors do not cause the issue, since they let infrared pass with little distortion. Privacy protectors, the ones that darken the screen from the side, are the other risk. Apple updated its Face ID support guidance with iPhone 18 Pro language warning that privacy covers might interfere with 3D face recognition, and its general troubleshooting advice is to remove anything covering the TrueDepth camera. One owner on X also reported laggy Face ID with a frosted film installed.
| Protector type | Face ID on iPhone 18 Pro | Our advice |
|---|---|---|
| Clear glass or film | Works normally | Safe choice |
| Privacy, made for iPhone 18 Pro | Should work if tested for it | Check the listing says Face ID compatible on this model |
| Privacy, older iPhone design | May interfere | Avoid |
| Matte, frosted or etched | Can fail or lag | Avoid if it covers the top left corner |
| No protector | Works normally | Reasonable thanks to Ceramic Shield 2 |
Based on reports from Dave2D, Apple’s support guidance and early owner feedback. Apple has not named specific protector models that fail.
There is a trap for anyone upgrading. The iPhone 18 Pro has the same height and width as the 17 Pro, so a protector you bought last year will physically fit. That does not mean it will work. If you used a matte protector on your old phone, do not move the leftover from the box onto the new one.
Is the pixelation ever a sign of a real fault?
Almost never, but there are a few things that should not be there. The normal effect is limited to a small rectangle in the top left corner, it does not change over time, and it is easiest to see on white backgrounds. If you notice any of these, book a Genius Bar appointment instead:
- Lines, flicker or discoloration that spread outside the top left corner
- A green or pink tint across a larger part of the screen
- Face ID failing without any screen protector, case lip or dirt over the corner
- A “Face ID is not available” message after a drop
Before that, try the boring fixes first: wipe the top left corner, remove the protector, and check that your case does not overhang the screen edge. Then restart the phone and set up an alternate appearance.
The bigger picture
The iPhone 18 Pro is a year of hidden changes. The outside looks almost identical to the 17 Pro, but inside there is a main camera with a six blade variable aperture, a vapor chamber with three times the surface area, and a rearranged battery layout. The REWA teardown found a 4,056mAh cell in a model with a physical SIM tray, and as we covered in our look at iPhone 18 Pro battery life, eSIM only US models get more room for battery.
The under display infrared camera fits that pattern. It is a modest change on its own, one sensor out of three, but it is the first step toward the front of an iPhone being nothing but screen and a single small hole. The faint grain in the corner is what that first step looks like. Expect it to fade as panel makers get better at packing pixels around sensors, the same way under display fingerprint readers on Android went from obvious circles to nearly invisible.
Frequently asked questions
Why is the top left of my iPhone 18 Pro screen pixelated?
That corner covers the Face ID infrared camera, which Apple moved under the display. The pixels there are spaced further apart so infrared light can reach the sensor. It is intentional and does not mean the screen is faulty.
Does under-display Face ID make Face ID slower or less secure?
Reviewers have not found any difference. Dave2D said Face ID on the iPhone 18 Pro Max worked just as well as on the iPhone 17 Pro. The dot projector and flood illuminator still sit in the front cutout, only the infrared camera moved.
Which screen protector should I use on the iPhone 18 Pro?
A clear protector is the safe choice. Matte, frosted and some privacy protectors can scatter infrared light and make Face ID fail or lag. If you want privacy glass, buy one that is specifically sold as Face ID compatible with the iPhone 18 Pro.
Can I make the pixelated patch go away?
Not completely, because it is part of the hardware. Using Dark Mode or a darker wallpaper makes it very hard to notice, since it is most visible where dark text sits on a bright white background.
Sources and further reading
- TechRadar: Noticing pixelation in the corner of your iPhone 18 Pro’s display? It’s there by design
- Notebookcheck: iPhone 18 Pro Max hides Face ID under the display, but matte screen protectors cause problems
- BGR: You need to know this before buying a screen protector for your iPhone 18 Pro
- AppleMagazine: Dynamic Island gets smaller as iPhone 18 Pro moves its infrared Face ID camera under the display
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