Review on Samsung Galaxy S21 5G Factory Unlocked Smartphone in US Version with Pro-Grade Camera, 8K Video, 64MP High Resolution, 128GB Storage, and Phantom Pink Color (SM-G991UZIAXAA) by Wei Shin Yin ᠌

However, I only learned about it after making the purchase when, an hour after using it, I noticed that I had a headache, that my eyes were really weary, and that I was in pain for the first time in my life. Prior to that, I had a smart phone with an ips matrix and could comfortably spend the entire day using it. Assuming that >300 Hz is regarded as safe, it came out that the maximum flicker frequency in s21 is only 240 Hz (at this level, the brain does not register a pulsation). That doesn't matter at high brightness, but the effect is more noticeable when the screen is darker. There are no such screens that are fully impervious to harm, however everyone is affected differently. Samsung is quite dissatisfied; I don't see why they didn't use standard displays; I'd be willing to accept more expensive ones, but it's safer because the majority of China manufacturers offer matrices with significantly superior PWM performance for this cost. After beginning to comprehend this subject, I came across inquiries from users about PWM in current Samsung models, to which the company's official response was the same and stupid; they wrote about the blue spectrum reduction mode (which I activated as soon as I picked up the phone) and the dark theme. Thus, you will have to sell the phone and buy either something with ips (which are virtually nonexistent in the premium segment) or anything Chinese with an amoled display.