Why PWM dimming hurts my eyes
Modern flagship phones often use pulse‑width modulation to lower screen brightness. PWM works by turning pixels on and off thousands of times per second, creating an invisible flicker. For most users this is unnoticed, but a significant minority – roughly ten percent of the population – are sensitive to that flicker. When the flicker reaches a certain threshold, the brain registers it as strain, leading to eye fatigue, headaches and reduced comfort during long sessions.
Devices such as Samsung Galaxy S26 Ultra, Apple iPhone 17, Apple iPhone 18 and Google Pixel 10 all rely on PWM dimming frequencies that top out around 480 Hz. At that rate the flicker can still be perceptible to PWM‑sensitive users, making everyday tasks like scrolling social feeds or watching videos uncomfortable.
What DC dimming could change
Direct current dimming, or DC dimming, adjusts the voltage supplied to the OLED panel instead of chopping the signal on and off. Because the pixels stay continuously lit, there is no flicker to trigger sensitivity. Recent leaks from leaker WalleGalaxy on X suggest that both Samsung Galaxy S27 Pro and Samsung Galaxy S27 Ultra will incorporate DC dimming, potentially making them the first Samsung Galaxy phones to move away from a pure PWM solution.
If Samsung delivers true DC dimming across the brightness range, users who experience PWM‑induced headaches could finally enjoy a flicker‑free experience on a high‑end Android device. The change would be especially noticeable at medium and high brightness levels where PWM is most commonly employed.
Hybrid approaches from competitors
Other manufacturers have already experimented with hybrid dimming schemes to balance colour accuracy and flicker reduction. The Honor Magic 8 Pro, Xiaomi 17 Ultra and OnePlus 15 all use a combination of very high‑frequency PWM – often above 2000 Hz – together with DC dimming at higher brightness settings. This approach minimises the perceptible flicker while preserving colour fidelity in low‑light scenarios.
Samsung’s rivals demonstrate that a hybrid model can work, but a pure DC implementation would simplify the pipeline and could offer the cleanest visual experience for sensitive users.
Samsung’s upcoming chipset choices
Beyond the display, the Galaxy S27 Ultra appears set to continue Samsung’s recent trend of equipping its top‑tier models with Qualcomm’s latest Snapdragon processor. Leaker yeux1122 reported that the Ultra will ship worldwide with the Snapdragon 8 Elite Extreme Gen 6, a chip that promises industry‑leading performance and power efficiency.
Current Samsung flagships such as the Galaxy S26 and Galaxy S26+ still rely on the Exynos 2600 in most regions, including the UK and Europe, while North America, China and Japan receive the Snapdragon 8 Elite Gen 5. Rumours of an Exynos 2700 powering the S27 Ultra have faded, suggesting Samsung is committing fully to Qualcomm for its premium device.
What this means for UK users
For consumers in the United Kingdom, the shift to Snapdragon 8 Elite Extreme Gen 6 means faster app launches, smoother gaming and better battery life compared with the previous Exynos offering. Combined with the anticipated DC dimming support, the Galaxy S27 Ultra could become a compelling choice for anyone who values both raw performance and eye‑friendly display technology.
While the standard Galaxy S27 model’s dimming method remains unconfirmed, the Pro and Ultra variants already hint at a significant step forward for eye health on Android smartphones. If Samsung can deliver reliable DC dimming without sacrificing colour accuracy, it may finally resolve the long‑standing headache that has plagued PWM‑sensitive users for years.