The Galaxy S21 Ultra packs a 6.8-inch Dynamic AMOLED 2X Infinity-O Display (3,200 x 1,440 pixels, 515 PPI) that’s HDR10+ certified. The screen additionally boasts an adaptive refresh rate that adjusts to the content you are viewing, from 10Hz to 120Hz, to better balance image quality and battery life.
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https://www.techspot.com/news/88293-samsung-galaxy-s21-ultra-features-adaptive-refresh-rate.html?utm_source=dlvr.it&utm_medium=blogger