Apple’s long-rumored iPhone Fold just got a lot more interesting. A new leak suggests the device will borrow a key display innovation from Samsung—one that could make foldable iPhones slimmer, brighter, and more power-efficient than many rivals. And this isn’t just about one phone. The same tech may shape future iPhones and even Samsung’s own flagship Galaxy devices.
Here’s what’s changing, why it matters, and what it tells us about where premium smartphones are headed next.
A display change that does more than look good
According to Korean outlet The Elec, Apple plans to use Samsung Display’s CoE (Color Filter on Encapsulation) technology on the upcoming iPhone Fold. Samsung internally brands this approach as “On-Cell Film,” and it’s already a proven feature in Galaxy Z Fold devices.
At a glance, CoE sounds like a minor display tweak. In reality, it tackles one of the biggest challenges in foldable phones: how to deliver a bright, premium screen without draining the battery or making the device bulky.
Why removing one layer makes such a big difference
Traditional OLED displays rely on a plastic polarizer layer between the cover glass and the panel. This layer reduces reflections and improves contrast—but there’s a major downside. It blocks roughly half of the light produced by the OLED, forcing the phone to use more power just to stay bright.
CoE technology eliminates that polarizer altogether. Instead, the color filter is integrated directly into the thin protective layer of the OLED. The result is a display that lets more light through, uses less energy, and takes up less physical space.
Samsung first introduced this concept—then called Eco² OLED—on the Galaxy Z Fold 3 in 2021, and it has quietly become one of the reasons Galaxy Z Fold phones manage respectable battery life despite relatively modest battery sizes.
The ripple effect: iPhone 18 and Galaxy S26 aren’t left out
The leak doesn’t stop at the iPhone Fold. The same report says CoE technology is expected to appear in the iPhone 18 lineup (including the rumored iPhone Air 2) and, notably, the Galaxy S26 Ultra.
If accurate, this would mark the first time Samsung uses CoE in a non-foldable Galaxy S phone—a sign that display efficiency is becoming just as important as raw battery capacity, even in traditional slab-style smartphones.
So what does this mean for iPhone Fold battery life?
Samsung Display claims CoE can reduce power consumption by up to 37%. While real-world gains are usually smaller, even a fraction of that improvement would be meaningful on a foldable device with a large internal screen.
Apple has already been attacking the battery problem from another angle. Last year’s iPhone Air introduced a “metal can” battery design, using a rigid casing that allows the battery to take custom shapes and sit closer to the phone’s edges. By rearranging the logic board, Apple effectively turned the center of the device into battery real estate.
Samsung has taken a similar path with recent Galaxy Z Fold designs, shrinking internal components and pushing them toward the edges to free up space.
Thin over chunky: Apple’s likely design philosophy
Put together, these changes suggest Apple isn’t chasing headline-grabbing battery sizes. Instead, the more likely goal is a noticeably slimmer iPhone Fold that doesn’t feel compromised in daily use.
Apple has historically avoided bulky designs, and it’s hard to imagine the company launching a foldable as thick as some early competitors. With Samsung’s ultra-slim Galaxy Z Fold designs setting expectations, Apple appears poised to follow a similar path—using efficiency gains to keep the phone thin, light, and premium.
Why this leak matters beyond one device
The bigger story here isn’t just the iPhone Fold. It’s the growing shift toward display efficiency as a core innovation driver. As phones get thinner and more complex, squeezing extra performance out of displays may matter more than simply adding bigger batteries or faster charging.
If CoE becomes standard across flagship phones, it could quietly reshape what users expect from battery life—especially on large-screen devices.
The question now is: would you rather have a thinner foldable phone with smarter power efficiency, or a thicker one with brute-force battery capacity? Share your take.
