We see with the iHMD that the hockey puck on the back of the unit that contains the electronics provides balance and prevents neck strain, same thing here.Elbit Systems outlines Paris Air Show involvement

the iHMD was developed for pilots so no surprise there. So Elbit is one of the avionic companies that eMagin is working with. There are two others, one is Boeing no doubt, the other must be either Rockwell or Honeywell.

New Capabilities – DigitalJHMCS is alight weight and comfortable head mounted display (HMD), provided by RCEVS, a joint venture with Rockwell Collins. Offering an improved HMD Center of Gravity (CG) and balance and thus reducing neck strains, DJHMCS isplug and play, with minimal installation requirements and the ability to operate with the aircraft’s current tracker and Electronic Unit.DJHMCS can replace legacy JHMCS equipment with no A/C modifications required, thus reducing life cycle costs. DJHMCS offers advanced video and color capabilities in both day and night missions using a modern, lightweight, well-balanced digital HMD system. The system’s proven symbology, combined with color, creates a superior solution that provides intelligent vision in the cockpit. It provides immediate and accurate recognition of friendly, threat and unknown targets and areas to create a complete view of the air, ground and sea picture.  This is accomplished with sophisticated software that integrates accurate intelligence with images, video and sound. The technological upgrade dramatically reduces the logistic and maintenance requirements.

http://helihub.com/2015/06/11/elbitsystems-to-showcase-advanced-new-concepts-capabilities-and-solutions-at-the-51th-paris-air-show/