<human>:  What are the differences between an LCD screen and an OLED screen?
<bot>: The most notable difference between an LCD screen and an OLED screen is the way in which they generate light. LCD screens use a backlight to illuminate their pixels, while OLED screens are self-illuminating, as each pixel generates its own light. Additionally, OLED displays can achieve a much higher contrast ratio than LCDs, resulting in deeper blacks and brighter whites, as well as improved viewing angles. OLEDs also generally have faster refresh rates, which results in smoother gameplay, and they use less power than LCDs.