Dimming shutter combining guest-host liquid crystal and photochromic materials for augmented reality applications
A headset for augmented reality applications is provided. The headset includes at least one eyepiece configured to provide a see-through image to a user via a transparent optical component, and to provide an artificial image through a display, and a dimming shutter configured to adjust a transparency level of the transparent optical component. The dimming shutter further includes an active liquid crystal layer configured to adjust a transparency level according to an electrical power provided between two electrodes, and a photoactive layer configured to adjust the transparency level upon absorption of an ultraviolet radiation for a selected period of time. A default orientation of a host material in the active liquid crystal layer may be in a dark state or in a clear state, when no electrical power is provided. A method and a memory storing instructions to execute the method for use of the above device are also provided.
1 . A device, comprising:
an active liquid crystal layer configured to adjust a transparency level according to an electrical power provided between two electrodes, the active liquid crystal layer including a host polymer oriented in a first direction and a liquid crystal polymer oriented in a second direction that is transversal to the first direction, when no electrical power is provided; and
a photoactive layer configured to adjust the transparency level upon absorption of an ultraviolet radiation for a selected period of time.
2 . The device of claim 1 , wherein the active liquid crystal layer comprises a reconfigurable liquid crystal host and at least two types of oblong dye molecules, with at least one type of dye molecule reversibly changing color in a presence of ultraviolet light, and at least one type of dye molecule remaining unchanged in the presence of ultraviolet light.
3 . The device of claim 1 , wherein the active liquid crystal layer and the photoactive layer form a single layer oriented in a plane perpendicular to an optical path of an eyepiece in a headset for an augmented reality application.
4 . The device of claim 1 , wherein the active liquid crystal layer is adjacent and parallel to the photoactive layer and is perpendicular to an optical path of an eyepiece in a headset for an augmented reality application.
5 . The device of claim 1 , wherein the active liquid crystal layer and the photoactive layer form a pixelated tiling of a portion of an eyepiece in a headset for an augmented reality application.
6 . The device of claim 1 , wherein the active liquid crystal layer is configured in a clear state when the electrical power is absent.
7 . The device of claim 1 , wherein the active liquid crystal layer is configured in a dark state when the electrical power is absent.
8 . A headset for augmented reality applications, comprising:
at least one eyepiece configured to provide a see-through image to a user via a transparent optical component, and to provide an artificial image through a display; and
a dimming shutter configured to adjust a transparency level of the transparent optical component, the dimming shutter further comprising:
an active liquid crystal layer configured to adjust a transparency level according to an electrical power provided between two electrodes, the active liquid crystal layer including a host polymer oriented in a first direction and a liquid crystal polymer oriented in a second direction that is transversal to the first direction, when no electrical power is provided, and
a photoactive layer configured to adjust the transparency level upon absorption of an ultraviolet radiation for a selected period of time.
9 . The headset of claim 8 , wherein the active liquid crystal layer comprises a reconfigurable liquid crystal host and at least two types of oblong dye molecules, with at least one type of dye molecule reversibly changing color in a presence of ultraviolet light, and at least one type of dye molecule remaining unchanged in the presence of ultraviolet light.
10 . The headset of claim 8 , wherein the active liquid crystal layer and the photoactive layer form a single layer oriented in a plane perpendicular to an optical path of the transparent optical component.
11 . The headset of claim 8 , wherein the active liquid crystal layer is adjacent and parallel to the photoactive layer and is perpendicular to an optical path of the transparent optical component.
12 . The headset of claim 8 , wherein the at least one eyepiece includes a display, and the active liquid crystal layer and the photoactive layer form a pixelated tiling of a portion of the display.
13 . The headset of claim 8 , wherein the active liquid crystal layer is configured in a clear state when the electrical power is absent.
14 . The headset of claim 8 , wherein the active liquid crystal layer is configured in a dark state when the electrical power is absent.