Hmmmm, just some brainstorming here:

You should be able to convert your smartphone's HD display into a low-resolution light field display by attaching a special lens array. It's like the lenticular 3D displays (they refract two rows of pixels in two different directions to create a stereo image), just omnidirectional.

I'm not sure how complex the manufacturing and calibration is but in theory we could create an attachable lens array for smartphones and use it to display a low-res light field, couldn't we?