Patent ID: 9223152
Filing Date: 2015-12-29
Classification: G01J,G02B,G02F

Abstract:
1. An apparatus for a head mounted display (“HMD”) comprising: a display module for launching computer generated image (“CGI”) light along a forward propagating path; an eyepiece optically coupled to receive the CGI light and direct the CGI light to an eye-ward region of the eyepiece; a switchable hologram disposed along a surface of the eyepiece, wherein the switchable hologram is configured to redirect ambient light propagating toward the eyepiece, when activated; a controller coupled to the switchable hologram to activate and deactivate the switchable hologram; and a light sensing module coupled to the controller and positioned to sense the ambient light, wherein the controller is coupled to activate and deactivate the switchable hologram in response to ambient light data generated by the light sensing module.