Inside Samsung's secret display lab, foldable screens endure extreme heat and half a million folds before ever reaching consumers. A rare tour reveals the brutal testing that ensures foldable phones can survive daily life.
CNET gained exclusive access to Samsung's display laboratory in South Korea, becoming one of the first outside witnesses to the rigorous stress tests applied to foldable screens. The visit underscores how seriously Samsung takes durability as foldable phones move from niche to mainstream. With rivals like Huawei and Motorola competing in the foldable space, Samsung's investment in testing aims to maintain its lead in the emerging category.
Foldable smartphones debuted in 2019 amid widespread skepticism about screen reliability. Early models suffered from creasing, debris ingress, and hinge failures. Samsung responded by building a dedicated lab to simulate years of use in days. The facility is part of the company's broader quality assurance infrastructure, which also includes drop tests, water resistance evaluations, and software stability checks. The lab operates under tight secrecy; only a handful of outsiders have ever been invited inside.
During the visit, journalists observed machines that repeatedly fold prototype screens upwards of 500,000 times. The process is conducted at elevated temperatures and in controlled humidity chambers to accelerate wear. Samsung claims this simulation equates to roughly five years of typical use for an average consumer. The company also tests for extreme heat cycles — up to 60°C (140°F) — to ensure displays don't degrade when left in hot cars or under direct sunlight. Each test is monitored with high-speed cameras and sensors that detect micro-cracks or delamination.
Beyond the hardware, the lab employs proprietary software algorithms that adjust fold patterns to mimic real-world handling — including partial folds, rapid flips, and sustained open positions. A single prototype can undergo several iterations before passing certification. Samsung's foldable display lab is a clear statement: the company is betting that foldables represent the next form factor for mobile devices, and it will not compromise on durability.
Industry analysts note that Samsung's testing rigor sets a benchmark for the entire sector. While competitors have released foldable devices with mixed durability reviews, Samsung's multi-year refinement — now in its fifth generation — has built consumer trust. The lab also feeds insights back into design teams, influencing material choices for the UTG (Ultra Thin Glass) layer and hinge mechanisms.
The immediate future will see Samsung's lab expand testing to include upcoming clamshell and book-style foldables, likely with higher fold ratings. As foldable adoption grows, such validation will become a key differentiator in marketing. Samsung's secrecy suggests it views this lab as a competitive moat — one that could define the next decade of mobile hardware.
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From Extreme Heat to Half a Million Folds: A Rare Look Inside Samsung's Display Lab
During a visit to South Korea, I was among the first people outside of Samsung to see how the company stress tests its foldable displays before they end up in your pocket.
Abrar Al-Heeti
CNET
3 min read
6/10
South Korea
Key Takeaways
- Samsung's secret display lab in South Korea subjects foldable screens to extreme heat up to 60°C and 500,000 repeated folds.
- A CNET reporter was among the first outsiders granted access to witness the stress tests firsthand.
- The lab uses custom machines that simulate real-world folding patterns, including partial folds and rapid flips, monitored by high-speed cameras.
- Samsung claims 500,000 folds simulate approximately five years of typical consumer use.
- The testing process directly informs design choices for the Ultra Thin Glass (UTG) layer and hinge mechanisms in production foldables.
Frequently Asked Questions
It is a secret facility in South Korea where Samsung tests the durability of foldable smartphone screens through extreme heat and repeated folding cycles.
Samsung tests foldable displays up to 500,000 folds, which the company says simulates about five years of typical consumer use.
The lab subjects screens to extreme heat up to 60°C (140°F) to simulate conditions like being left in a hot car or direct sunlight.
Samsung uses the lab to ensure its foldable phones meet high durability standards before reaching consumers, maintaining its market lead in the foldable category.
The lab is located in South Korea, though the exact address is not publicly disclosed due to its secretive nature.
A CNET reporter was among the first outsiders granted rare access to witness the stress tests firsthand.
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www.cnet.com
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