![]() ![]() This is noticeable at different brightness reduction levels for different monitors. If there is PWM, it is better to have a high frequency of around 20000 times per second instead of, say, 200. In these light impulses, the light/no-light time ratio varies, while brightness remains unchanged, which is harmful to your eyes. ![]() When you lower the brightness, the light intensity of the backlight is not lowered, but instead turned off and on by the electronics with a frequency indistinguishable by the human eye. Pulse Width Modulation (PWM) is an easy way to control monitor brightness. ![]() > Top Laptop PWM Ranking (Rated by negative impact on eyesight) << They are especially harmful in models with LED backlight because the colors of the emitted light are not as inert as the colors of the CCFL backlight and so they reach high amplitudes and rapid luminance changes.īasically, the problem comes from the flickering light, not from the crystals of the LCD monitors. They cause multiple contractions and expansions of the pupils, which bears down negatively on your health. In most cases, those pulsations have a frequency somewhere around 200Hz. They can lead to migraines, headaches or other forms of discomfort after long-term usage. The pulsations can be bad for your health and more specifically for the users’ eyesight. PWM is used to regulate the brightness of LCD and LED displays. Perhaps you’ve noticed that the Laptop Media team has started testing every laptop for pulse-width modulation. ![]()
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