Samsung Galaxy S26 Ultra: Privacy Display Debuts with Persistent 480Hz PWM Dimming

The Samsung Galaxy S26 series, including its flagship S26 Ultra model, introduces an innovative new Privacy Display technology. However, the S26 Ultra continues to utilize a low Pulse Width Modulation (PWM) dimming rate of 480Hz and does not offer alternative flicker-reduction options for users. This decision marks a significant point of discussion regarding display accessibility.

Understanding PWM Dimming

PWM dimming is a fundamental method used to control display brightness by rapidly switching LEDs on and off. While this rapid cycling is not always consciously perceptible, lower PWM frequencies have been linked to discomforts such as eyestrain, headaches, and nausea, particularly for individuals sensitive to flicker at lower brightness levels. To counter these potential side effects, higher PWM frequencies or direct current (DC) dimming methods are generally employed by manufacturers.

Industry Approaches to Flicker Reduction

Many smartphone manufacturers have actively adopted advanced technologies to mitigate display flickering, offering users more comfortable viewing experiences. HONOR and OPPO, for example, have integrated high-frequency PWM dimming into several of their devices. The HONOR X9d notably features a 3,840Hz rate, while the OnePlus 13R boasts a 2,160Hz rate.

Beyond high-frequency PWM, other brands are exploring diverse solutions. Xiaomi, for instance, offers both DC dimming and a hybrid approach, as seen in the Xiaomi 15 Ultra's combination of DC dimming and 1,920Hz PWM dimming. Additionally, some brands provide user-facing software features, such as the Realme GT 7 Pro's dedicated anti-flicker mode or the OnePlus 13's toggle for DC dimming, giving consumers direct control over their display settings.

Impact on User Accessibility

The absence of advanced flicker-reduction features can significantly affect users with PWM sensitivity. For individuals experiencing chronic migraines and photophobia, low PWM frequencies, especially when screens are at reduced brightness, can exacerbate symptoms and potentially trigger attacks.

A lack of transparent information from manufacturers regarding dimming rates and eye-care features makes it challenging for consumers to make informed purchasing decisions.

While PWM sensitivity may not affect all users, providing accessibility options is presented as a valuable goal, ensuring a wider user base can comfortably interact with their devices.

Conclusion

While the Privacy Display on the Galaxy S26 Ultra represents an innovation in display technology, the continuation of a 480Hz PWM dimming rate and the lack of other flicker-reduction alternatives on Samsung's latest flagship series are noted as a missed opportunity.

When compared to competitor offerings that prioritize advanced flicker reduction, Samsung's approach on the S26 Ultra falls short in providing improved display accessibility.