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The cathode ray tube was revolutionary - it brought screens to the home, before it you had to go to the cinema to watch a movie. In the last couple of decades CRT was displaced by LCD - liquid crystal displays - but now LCDs themselves are under attack from OLED - organic light emitting diodes. Our poll shows that people prefer OLED, but since it's a relatively new tech, few phones use this type of display. Samsung was an early mover in the field with 2004's X120, which had a 1.8" OLED display with 128 x 128 pixel resolution. The number of OLED-packing phones has grown significantly since...
Source: https://www.gsmarena.com/counterclockwise_oled_screens-news-28552.php