Facebook presented a new class of display designs that mixes holographic optics, directional backlighting, laser illumination, and polarization-based optical folding for thin, lightweight, and high-performance near-eye displays for virtual reality.
The new design uses only thin, flat films as optical components meaning that we might get VR displays with thicknesses of less than 9 mm, fields of view of over 90 degrees horizontally, and sunglasses-like form factors at some point in the future.