Samsung Unveils the Galaxy Z Flip

Samsung unveiled the Galaxy Z Flip at Samsung Unpacked on February 11, 2020, pricing it at $1,380 — significantly less than the Galaxy Fold ($1,980) and Motorola Razr 2019 ($1,499), its direct competitors in the emerging foldable clamshell category. The Z Flip’s 6.7-inch Infinity Flex Dynamic AMOLED display folded vertically to a compact 73.6×87.4 mm square, compared to the Motorola Razr’s similar form factor. The critical materials difference was Samsung’s use of Ultra-Thin Glass (UTG) — approximately 30 μm thick glass from Schott AG with a polymer backing — as the display substrate, replacing the plastic film (polyimide) used in the Galaxy Fold and Motorola Razr. The UTG provided a harder surface that resisted fingernail scratching and felt more like traditional glass to the touch, though it was still flexible enough to fold. A 1.1-inch 300×116 pixel cover display showed time, notifications, and music controls when closed. The SoC was the Snapdragon 855+ (not the then-current Snapdragon 865), with 8 GB RAM and 256 GB UFS 3.0 storage, running Android 10 with One UI 2.1.

The hinge mechanism — Samsung called it “hideaway hinge” — was the most complex engineering element: it needed to hold the display at any angle from 0° to 180° without snapping shut or falling open (a “Flex Mode” software feature at 90° showed split-screen apps using the crease as a natural dividing line), resist particle infiltration (a sweeper system of brushes inside the hinge mechanism deflected debris away from the flex point), and survive Samsung’s rated 200,000 fold cycles while routing flexible printed circuit cables for the display and touch controller through the hinge body. The Galaxy Fold (April 2019) had suffered highly visible hinge durability failures at launch — review units broke within hours when debris entered the hinge — giving Samsung strong commercial motivation to solve the dust ingress problem. The hinge gap visible when the Z Flip was folded closed (a few millimeter space at the fold point where the display curve required clearance) was a consequence of the minimum bend radius of the UTG substrate.

Samsung’s “Flex Mode” represented the first significant software adaptation for foldable clamshell form: Android 10’s new foldable API allowed apps to detect when the hinge angle crossed 90° and rearrange content into upper and lower half displays. Samsung’s own camera app showed viewfinder in the top half and controls in the bottom half; Google Meet and YouTube adapted similarly. Android 10’s display cutout APIs handled the physical notch for the front camera in the unfolded state. The Z Flip sold well enough to establish the clamshell foldable as a distinct product category — Samsung followed with the Z Flip 5G in July 2020 (Snapdragon 865+), Z Flip 3 in August 2021 (starting $999, significantly expanding market), and annual Z Flip updates through the mid-2020s. Motorola’s Razr line and eventually Google’s Pixel Fold (2023) followed the same clamshell approach.