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Samsung's Galaxy S27 display may finally offer a solution for those who have struggled with the company's use of low-frequency PWM (pulse-width modulation) dimming. Over the years, the author has faced difficulty using Samsung phones for extended periods due to the headaches, eye pain, and nausea caused by PWM dimming. While Motorola has provided DC dimming as an option on all its OLED-equipped phones, Samsung has traditionally favored PWM dimming.

DC dimming is a more traditional dimming method used in lightbulbs and displays for many years and is often considered more comfortable than PWM dimming.

The rumor suggests that the Galaxy S27 may feature an option to use DC dimming, which would be a significant improvement for people sensitive to PWM dimming. DC dimming provides a more comfortable experience compared to PWM dimming, and some advocacy groups have noted the preference for DC dimming in displays. However, there are a few reasons why Samsung has chosen PWM dimming over the past years.

PWM dimming offers better display quality in low-light situations due to potential "mura" at low brightness levels with DC-dimmed OLEDs. Additionally, PWM dimming can be associated with better battery life, and it is generally less expensive to implement in terms of manufacturing costs.

Despite the advantages of PWM dimming, companies like Apple and Google have been making changes to accommodate PWM-sensitive individuals; however, neither has fully adopted DC dimming like the Galaxy S27 display rumor suggests Samsung may. Motorola Signature 27 is currently the only flagship device in the US that supports DC dimming. OnePlus used to offer DC dimming in its flagship phones, but it no longer sells its phones outside of China.