PWM dimming definition
PWM dimming, short for Pulse Width Modulation dimming, is a technique used to control screen brightness in smartphones, TVs, and other displays. Instead of reducing the voltage to lower brightness, the display rapidly switches the light source on and off at a very high speed. This switching happens so fast that the human eye usually does not notice it.
The brightness level is controlled by the duty cycle, which means how long the light stays on versus how long it stays off in each cycle. When the light stays on for a longer time, the screen looks brighter. When the on time is shorter, the screen appears dimmer. At low brightness levels, the off time increases, which can cause screen flicker for some users.
High-frequency PWM dimming is used to reduce this flicker effect. Because the switching happens much faster, it puts less strain on the eyes and improves viewing comfort, especially in low-light conditions. This is why many brands highlight high PWM values as an eye-friendly display feature.
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