Articulating hinge designs capable of tilt and height adjustment, whether at the base of the lens assembly or at the foundation of the portable projector, make a huge difference. Beyond keystone correction, hinges offer a much wider angle of projection to accommodate numerous locations and situations. Entirely fixed projectors limit that flexibility. They lead to awkward situations where you need stacks of magazines or unstable surfaces like pillows to get the image where you want on a screen or a wall, and even then it’s a bunch of trial and error.
And it’s not just choice of projection angle that matters, as the quality of projection is clearly important. Portable projectors worthy of acclaim use LED-based DLP (digital light processing) technology that’s way beyond what simple LCD projectors can accomplish. For one, there’s resolution. Pocket projectors may look cool, but sadly the technology doesn’t yet exist to make them more than a novelty for a quick meeting at the office. Most of them are barely standard definition. Comparably, good portable projectors offer 720p HD and above, with full HD 1080p becoming normal.