In our reviews, OLED TVs, which use organic light-emitting diode technology, have always had better picture quality than LED TVs, which are basically LCD TVs that use LED backlights. The main reason is that OLED TVs can produce a perfectly dark shade of black with no stray illumination of blooming, which leads to better contrast and pop. LED TVs can get brighter, however, and usually cost less than OLED TVs.