There might be a potential war soon if Microsoft launch their Hololens later this year.
Some good information from the Oculus Rift subreddit from /u/FredzL on Google's investment, Magic Leap (Google Glass 2?), in comparison:
> **Disclaimer** : pure speculation based on published patents and reviews.
>
> I think Magic Leap is :
>
> * 40°x40° FOV
> * 8 Mpx/4K (scanning fiber display with piezoelectric actuator)
> * 60 Hz
> * blocking light from the physical world (occlusion mask with LCD(s))
> * nearly correct accommodative depth cues (zone plate diffraction patterning device => 12 levels of depth from 0.5 m to 3 m)
> * low-persistence (720 Hz high-frequency binary display => 1.38 ms illumination per depth layer)
> * glasses form-factor (waveguide with embedded diffraction grating => end goal, not done yet)
> * release in 2016-2017
>
> I think Microsoft HoloLens is :
>
> * ~40°x22° FOV at most (from the reports : tiny FOV, rectangular)
> * 4 Mpx/2.5K (OLED) or 8 Mpx/4K (LCoS) but color sequential
> * 60 Hz
> * not blocking light from the physical world (additive blending)
> * no accommodative depth cues
> * full persistence
> * large and heavy glasses form-factor
> * release in 2015
reddit/com/r/oculus/comments/2t74sf/microsoft_announces_windows_holographic_ar/cnwsyny
---
> Yes it's a supposition, but the technology described looks quite close to what would be required to back the Magic Leap claims (3D CG elephant appearing to exist in the real world).
>
> Requirements would be :
>
> * suitable FOV for AR
> * suitable resolution for 20/20 visual acuity
> * accommodative response to provide absolute distance information and avoid the vergence-accommodation conflict
> * blocking of light from the real world when a pixel of the object should be visible
> * transparency of pixels for which the real world should be visible
>
> The patents state these requirements to best match the capabilities of the average human visual system :
>
> * 50 pixels/° for 20/20 visual acuity (should be 60 pixels/° but close enough)
> * minimum FOV of 40°x40°, requiring 8 Mpx for 20/20 vision (looks like the best candidate)
> * desired FOV of 120°x80°, requiring 50 Mpx for 20/20 vision
>
> And their patents make these claims :
>
> * **projection device** : scanning fiber display with piezoelectric actuator with a 3840×2048 resolution (8 Mpx) at 60 Hz
> * **occlusion mask** : blocks light in specific pixels with liquid crystal display(s) operating at 60 Hz coupled with the projection device
> * **zone plate diffraction patterning device** : 12 layers (focal planes) of depth from 0.25 to 3 m operating at 720 Hz for 60 Hz viewing
> * **waveguide with embedded diffraction grating** : redirects collimated light towards the eye through the diffraction pattern while allowing transparency
>
reddit/com/r/oculus/comments/2stl1h/the_verge_posted_a_ton_of_magic_leap_patent/cntcrxd