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The HP Elite x3 smartphone I've been using has an eye-popping 6-inch OLED display. It's not hard to see why Apple is gravitating to OLED tech. (Credit: Hewlett-Packard)

The HP Elite x3 smartphone I've been using has an eye-popping 6-inch OLED display. It's not hard to see why Apple is gravitating to OLED tech. (Credit: Hewlett-Packard)