The question was: is there a true difference between LCD and OLED screens?
Well, the answer is: definitely.
According to Wikipedia: “A significant advantage of OLED displays over traditional liquid crystal displays (LCDs) is that OLEDs do not require a backlight to function. Thus, they can display deep black levels, draw far less power, and can be much thinner and lighter than an LCD panel. OLED displays also naturally achieve much higher contrast ratio than LCD monitors.”
In other words, organic light-emitting diode(OLED) are screens that depends on very minute diodes that light up forming what we see, thus it doesn’t need backlight and this reduces the power consumption dramatically, while the traditional Liquid Crystal displays is made of pixels that require backlight. As you can imagine, this will keep your battery last more which is nice.
In addition, OLED screens are also known for forming more realistic more lively photos that looks more real than the ones showed on LCDs.