Patent ID: 8724206

Claim:
A head mountable display (“HMD”), comprising: a display module for generating computer generated image (“CGI”) light; an eyepiece including: a viewing region to emit the CGI light out of the eyepiece along an eye-ward direction; an input end peripherally located from the viewing region, the input end optically coupled to receive the CGI light into the eyepiece from the display module; light bending optics disposed internal to the eyepiece to redirect the CGI light received at the input end out of the viewing region along the eye-ward direction; an ambient scene side through which ambient scene light is received into the eyepiece; an eye-ward side opposite the ambient scene side out of which the ambient scene light and the CGI light are passed along the eye-ward direction; and a photo-chromic coating disposed on the ambient scene side and the eye-ward side, the photo-chromic coating to darken in the presence of UV light; and a frame assembly to support the eyepiece and the display module for wearing on a head of a user with the viewing region positioned in front of an eye of the user.