Broadly speaking, LED LCDs are better than regular LCDs, but most LCD TVs are now actually LED TVs. Within the "LED TV" ...

The tl;dr is that if all you care about is picture quality, OLED is the way to go. If you want something extremely large (100-plus inches), extremely bright (too much ambient light in your room), or ...

British inventors began experimenting with electric lighting in the 1830s, working on so-called arc lamps, while other scientists around the world focused on developing a functioning incandescent lamp ...