Patent ID: 9223139
Filing Date: 2015-12-29
Classification: G02B,G06F

Abstract:
1. An apparatus for a head mounted display (“HMD”), the apparatus comprising: a display module for launching display light along a forward propagating path; a light relay optically coupled to receive the display light, wherein the light relay includes: a controller coupled to selectively activate the first SHO, the second SHO, and the third SHO, wherein the first SHO is configured to direct at least a first portion of the display light toward an eye-ward side of the light relay when the first SHO is activated by the controller, and wherein the second SHO is configured to direct at least a second portion of the display light toward the eye-ward side of the light relay when the second SHO is activated by the controller, and further wherein the third SHO is configured to direct at least a third portion of the display light toward the eye-ward side of the light relay when the third SHO is activated by the controller, wherein the first SHO includes a first holographic medium written with a first, second, and third Bragg selectivity to cause a first, second, and third spectrum of the display light to be collimated and reflected toward the eye-ward side of the light relay when the first SHO is activated by the controller, and wherein the second SHO includes a second holographic medium written with the first, second, and third Bragg selectivity to cause the first, second, and third spectrum of the display light to be collimated and reflected toward the eye-ward side of the light relay when the second SHO is activated by the controller, and wherein the third SHO includes a third holographic medium written with the first, second, and third Bragg selectivity to cause the first, second, and third spectrum of the display light to be collimated and reflected toward the eye-ward side of the light relay when the third SHO is activated by the controller.