Patent ID: 9651786
Date: 2017-05-16
CPC Classifications: G02B,G06F,G06T,G09G,H04N

Claim:
1. An optical system comprising: a display device having a first bright display state when the display device emits light and a second dark display state when the display device emits a reduced amount of light; a beam combiner; and a shutter having a first blocking shutter state in which the shutter blocks light passing through the beam combiner and incident on the shutter and a second transmissive shutter state in which the shutter transmits light so that light can pass through the beam combiner, the shutter configured to be controlled by a control system, such that the shutter is in the first blocking shutter state when the display device emits light and the shutter is in the second transmissive shutter state when the amount of light emitted from the display device is reduced, wherein the control system is configured to transition the shutter between the first blocking shutter state and the second transmissive shutter state at a rate between about 1 microsecond and about 100 milliseconds which is less than or equal to the persistence of vision such that an unaided human eye can simultaneously perceive objects in a real-world environment and visual information displayed by the display device.