I grew up with a front-projector TV the size of a coffee table, later owned a rear-projection TV that was somewhat larger than an adult bicycle, and have since tested projectors shaped like DVD players, Mac minis, and iPhone cases. Pico projectors — generally small enough to fit in pockets — typically struggle the most to prove their practicality. Projectors generally need big, powerful lightbulbs to be seen in anything but the dimmest of rooms, and the smaller they are, the worse they tend to be, particularly as they move further from the surfaces they’re protecting on.
Korean developer Celluon — the company behind breakthrough laser keyboards that can create typing surfaces anywhere — is now trying its hand at pico projectors, and I have to admit that I’m far more impressed than I thought I’d be. PicoPro ($349) packs a high-definition video projector, a battery pack, and wireless capabilities into a 0.55″ thick enclosure with the same footprint as an iPhone 6 Plus. Overall, it’s the best small projector I’ve tested: much easier to use, quiet, and capable of delivering a better complete viewing experience. But like competing pico projectors, it also has some noteworthy limitations that you’ll want to be aware of before jumping in.