I think you mean "LCD/LED" monitors (where "LED" is commonly used to mean an LCD panel with an LED backlight, and "LCD" is used to differentiate old CCFL-backli

I think you mean "LCD/LED" monitors (where "LED" is commonly used to mean an LCD panel with an LED backlight, and "LCD" is used to differentiate old CCFL-backlit LCD panels). OLED screens do not have a backlight and thus don't have a diffuser.