Model codes for iPhone XS: A1920, A2097, A2098 (Japan), A2099, A2100
OLED vs LCD:
An OLED display works without a backlight because it emits visible light. Thus, it can display deep black levels and can be thinner and lighter than a LCD. In low ambient light conditions (such as a dark room), an OLED screen can achieve a higher contrast ratio than an LCD