PWM

2 articles

Tech 15 Sep 2026 5 min read

OLED PWM Dimming Turns Brightness into Timed Pulses

An OLED pixel does not need a backlight. Its organic emitters produce light directly, so panel electronics can regulate luminance at the pixel level. One common control method is pulse-width modulation, or PWM: emission alternates between active and inactive intervals, and the ratio of those intervals sets the average light output seen over time. That temporal pattern matters because a display can refresh an image at one rate while modulating emitted light at another. A 120 Hz refresh specification therefore says little by itself about the frequency or depth of brightness modulation.

OLED Displays

Tech 14 Sep 2026 7 min read

OLED PWM Dimming Controls Brightness With Light Pulses

Lowering a phone’s brightness slider does not always mean its OLED pixels simply emit a weaker, perfectly steady glow. Many OLED displays use pulse-width modulation, or PWM, for at least part of their brightness range. The pixels alternate between brighter and darker states quickly enough that the resulting light is perceived as a lower average level. This behavior is easy to miss during ordinary use because the modulation can happen hundreds or thousands of times per second. A camera with a suitable shutter setting may reveal bands, while measurement equipment can show the changing light output directly.

OLED Displays