Amoled is a patent of Samsung, which is commonly called oled. The screen of this kind of product is originally blue. Specifically, you can trace back to the S2 and s3 periods of Samsung. Samsung s3 is a double standard in the global market. Japanese s3 screen is much better than China's, while China's products are the bluest (worst) of all products. To put it bluntly, Lenovo's screen was better than S3, because the screen itself was at least not blue.
Samsung's big blue screen problem belongs to Samsung's technical defects, but China's marketing staff described this blue color as a kind of height. To know that Samsung's advanced machines are free to use, it is not appropriate to say that they are free. Look up more old materials and compare them at home and abroad, and you will understand everything.