Dynamic field of view variable focus display system
An augmented reality (AR) device is described with a display system configured to adjust an apparent distance between a user of the AR device and virtual content presented by the AR device. The AR device includes a first tunable lens that change shape in order to affect the position of the virtual content. Distortion of real-world content on account of the changes made to the first tunable lens is prevented by a second tunable lens that changes shape to stay substantially complementary to the optical configuration of the first tunable lens. In this way, the virtual content can be positioned at almost any distance relative to the user without degrading the view of the outside world or adding extensive bulk to the AR device. The augmented reality device can also include tunable lenses for expanding a field of view of the augmented reality device.
1. A wearable display device, comprising:
a waveguide;
a first optical steering component positioned on a user-facing side of the waveguide and being parallel to the waveguide;
a second optical steering component positioned on a world-facing side of the waveguide and being parallel to the waveguide; and
a light source configured to emit light representing virtual content into the waveguide, the waveguide including diffractive optics configured to diffract the light emitted from the light source through the first optical steering component and towards a user of the wearable display device, wherein the light source is configured to emit the light in accordance with a scan pattern that results in the light being emitted through different peripheral regions of the first optical steering component;
wherein the first optical steering component is configured to shift at least a portion of the light received from the light source at one or more of the different peripheral regions of the first optical steering component towards a central region between the different peripheral regions.
2. The wearable display device of claim 1 , further comprising an eye tracking sensor, wherein the central region is determined based on a location that the eye tracking sensor indicates an eye of the user is focused on.
3. The wearable display device of claim 1 , wherein the first optical steering component comprises an array of tunable prisms configured to change a direction of the light exiting one of the different peripheral regions substantially more than the light exiting a central portion of the first optical steering component.
4. The wearable display device of claim 1 , wherein the second optical steering component is configured to prevent the first optical steering component from distorting the appearance of real-world objects visible through the waveguide.
5. The wearable display device of claim 1 , further comprising:
a first lens positioned on the user-facing side of the waveguide; and
a second lens positioned on the world-facing side of the waveguide.
6. The wearable display device of claim 5 , wherein the first lens is configured to change its phase profile to adjust an apparent distance between a user of the wearable display device and the virtual content displayed by the wearable display device.
7. The wearable display device of claim 1 , wherein the wearable display device is an augmented reality device and wherein light from a surrounding environment passes through both the first optical steering component and the second optical steering component.
8. The wearable display device of claim 7 , wherein the second optical steering component maintains a first optical configuration that is complementary to a second optical configuration of the first optical steering component, such that the light from the outside world passing through the first and second optical steering components appears undistorted to a user of the wearable display device.