Foldable phone screens

Foldable phone screens is the tool on this page. The control sits above this text. Use it on the display you want to judge, then read what the result can and cannot mean. The target phrase people search is tied to this job, and the explanation below stays with that job instead of repeating a generic review of every display ever made.

A foldable is two screens that share a hinge, and the search terms people use are specific: iPhone, Samsung, Fold, Flip, and the newer iPhone Duo name. Screenz keeps a page for the Galaxy Z Fold 7, the Galaxy Z Flip 7, and the iPhone Duo so those words land on a tool instead of a thin article. The numbers below are published specifications, not a measurement Screenz took of your unit. Your unit can differ by a rounding of the diagonal, a software refresh cap, or a protector you added.

Galaxy Z Fold 7, released in 2025: the inner Dynamic AMOLED 2X is 8.0 inches, 1968×2184, about 368 pixels per inch, up to 120 Hz. The cover display is 6.5 inches, 1080×2520, about 422 pixels per inch, also up to 120 Hz. Unfolded the phone is a small tablet and nearly square. Folded it is a tall phone. Run a white field and a black field on both. The crease is a line, not a cluster of dead pixels. If a dot stays put away from the crease on white and on black, then you are looking at a pixel fault.

Galaxy Z Flip 7 is a clamshell. The main display is 6.9 inches, 1080×2520, about 397 PPI, 120 Hz. The cover is about 4.1 inches and much closer to square, on the order of 948×1048. The cover is where dust, a case, and a widget layout hide pixels. Test it separately. The inner crease runs across the main display the short way. A gradient across that line shows the crease more clearly than a home screen wallpaper.

iPhone Duo is the shipping name that grew out of the iPhone Fold rumors. Launch coverage describes a 7.6-inch inner OLED and a 5.4-inch cover, both with high refresh, and a reported inner grid around 1878×2670 with a cover around 1398×2034. Treat the exact pixel grid as something to confirm on Apple's own spec page, because early write-ups disagree by a few pixels. The useful fact for a test does not depend on the last pixel: the cover is a small phone, the inner display is a large, tall sheet, and you should cycle solid colors on both if you are checking a used one.

How to test any of them. Clean both faces. Fullscreen a white, a black, a red, a green, and a blue. Look along the hinge for a pressure band, then look away from the hinge for a single stuck dot. Open the PPI calculator and type the face you are on, not the other face. A density number for the cover tells you nothing about the inner panel. Finish with the touch grid, slowly, including the row nearest the hinge.

Screenz is a set of pictures and arithmetic for the display you already have. The picture is drawn by the browser. The arithmetic is the same formula a spec sheet uses, written out so you can change the inputs. Neither one is a laboratory certificate. A dead pixel you can see is real. A refresh number that does not match the sticker is a clue about the operating system, the cable, the battery mode, or the browser, not an automatic failure of the panel.

Use fullscreen when you are hunting a mark. The address bar, the notch, and the rounded corner all hide the edge, and the edge is where a bad pixel and a fold crease like to sit. On a phone, turn the brightness up and turn off the reading tint. On a monitor, leave the preset you actually use, then repeat the test in the neutral preset if you are judging color. Night shift, f.lux, and vivid modes are fine for the evening and misleading for a test.

Dust sits on the glass and moves when you tilt the panel. A dead subpixel stays dark. A stuck subpixel stays lit, so it shows on black. A crease on a foldable is a hinge in the stack. It is not a dead pixel, and a flat color shows it more honestly than a photograph. Pressure spots and backlight bleed on an LCD change with the angle of your head. OLED black should look off, except at the camera hole and along a fold.

The browser cannot measure nits, cannot read EDID on most pages, and cannot promise that a 10-bit ramp is being sent as 10-bit. If a gradient shows steps, the steps may be the panel, the operating system, or the compositor. If a refresh counter reads 60 on a 144 Hz monitor, check the cable, the power plan, and the display setting before you blame the page. Screenz will say this again because it is the difference between a useful test and a false warranty claim.

Photographing the panel with a second phone adds moiré and makes uniformity look worse than it is. Trust your eye at the distance you actually sit. Move closer only to confirm that a mark is in the pixels rather than on the glass. Then wipe the glass and look again. A foldable should be checked twice, cover display and inner display, because they are different diagonals, different pixel densities, and often different aspect ratios.