Headset visual displacement for motion correction
Many headset devices, such as virtual reality helmets, present visuals that respond to the user's motion, such that a rotation of the user's head causes the visual to be re-rendered from a correspondingly rotated perspective. The lag between the user's motion and the updated rendering from the new perspective may be perceivable even at high framerates, and may induce unpleasant feelings such as vertigo. Instead, headset devices may respond to detected motion by identifying a displacement of the physical location of the visual that causes it to maintain a physical position relative to a stationary reference point. The display is operatively coupled with a displacer, such as actuators or a projection adjustment, that are engaged to displace the display according to the identified displacement and maintain a physical location of the visual relative to the stationary reference point (e.g., until the visual is re-rendered from the updated perspective).
1. A headset comprising:
a display that presents a visual;
a motion sensor that detects a motion of the headset;
a visual displacer that:
identifies a displacement of the display, opposite the motion, that maintains a physical position of the visual relative to a stationary reference point; and
displaces the physical position of the visual according to the displacement;
a visual generator that incrementally adjusts a perspective of the visual, from an initial perspective to an updated perspective, based upon the motion of the headset; and
a visual generator interface that periodically reports the displacement of the visual to the visual generator.
2. The headset of claim 1 , wherein the motion sensor further comprises at least one of:
an accelerometer;
a gyroscope;
a compass;
a headset-mounted camera; and
a visual coordinator coupled with an external detector of the headset.
3. The headset of claim 1 , wherein:
the motion sensor detects the motion of a motion type selected from a motion type set comprising:
a lateral translation;
an axial translation;
a sagittal translation;
a lateral rotation;
an axial rotation; and
a sagittal rotation; and
the visual displacer physically displaces the display according to the motion type of the motion detected by the motion sensor.
4. The headset of claim 1 , wherein the visual displacer further comprises an actuator operatively coupled with the display that physically displaces the display according to the displacement.
5. The headset of claim 4 , wherein the actuator further comprises a voice coil actuator.
6. The headset of claim 4 , wherein the actuator further comprises a stepper motor that verifies the physical position of the display.
7. The headset of claim 1 , wherein:
the display further comprises a projector that emits a projection of the visual; and
the visual displacer further comprises a digital micromirror that reflects the projection of the visual toward a display surface, and that rotates to displace the projection upon the display surface according to the displacement.
8. The headset of claim 1 , wherein:
the display further projects the visual upon a display surface through a prism; and
the visual displacer further comprises a prism controller that changes a position or orientation of the prism to displace the visual projected upon the display surface according to the displacement.
9. The headset of claim 1 , wherein the display further spans an interior range of the headset beyond a peripheral vision range of a user of the headset.
10. The headset of claim 1 , wherein:
the display further overscans the visual and initially presents a portion of the visual beyond a boundary of the display; and
displacing the physical position of the visual further comprises: in conjunction with displacing the physical position of the visual, adjusting the presentation of the visual to display the portion of the visual consistent with the displacement of the visual.
11. The headset of claim 1 , wherein the visual displacer physically displaces the display by:
physically displacing the display, from an initial position, for a displacement period; and
after the displacement period, returning the display to the initial position.
12. The headset of claim 11 , wherein returning the display to the initial position further comprises:
incrementally choosing a second displacement that is smaller than a previous displacement of the visual; and
displacing the physical position of the visual at incrementally smaller intervals according to the second displacement.
13. The headset of claim 11 , wherein:
prior to fully returning the display to the initial position, a second motion of the headset is detected; and
identifying the displacement comprises: identifying a second displacement of the display, opposite the motion, that also incorporates the second motion of the headset.
14. The headset of claim 11 , wherein returning the display further comprises: detecting a displacement position during a stationary period represented by an absence of motion of the headset.
15. The headset of claim 11 , wherein:
the motion sensor detects the motion based upon at least one of:
a lateral translation;
an axial translation;
a sagittal translation;
a lateral rotation;
an axial rotation; or
a sagittal rotation.
16. The headset of claim 11 , wherein:
the display receives the visual from the visual generator that, after receiving the motion detected by the motion sensor, adjusts the perspective of the visual according to the motion; and
the visual displacer returns the display to the initial position coincident with the visual generator adjusting the perspective of the visual.
17. The headset of claim 16 , wherein:
the visual displacer further incrementally returns the display to the initial position, coincident with the visual generator incrementally adjusting the perspective of the visual from the initial perspective to the updated perspective.
18. The headset of claim 16 , wherein:
the visual generator generates the visual at a visual framerate; and
returning the display to the initial position coincident with the visual generator further comprises: incrementally adjusting the physical position of the visual according to the visual framerate.
19. A method of presenting a visual on a display of a headset, the method comprising:
using a motion sensor, detecting a motion of the headset;
identifying a displacement of the display, opposite the motion detected by the motion sensor, that maintains a physical position of the visual relative to a stationary reference point;
engaging a visual displacer operatively coupled with the display to displace the physical position of the visual from an initial position according to the displacement;
adjusting a perspective of the visual, from an initial perspective to an updated perspective, based upon the motion of the headset; and
returning the display to the initial position coincident with the adjusting the perspective of the visual.
20. A visual control system operatively coupled with a visual displacer that adjusts a physical position of a visual presented by a display within a headset, the visual control system comprising:
a motion sensor that detects a motion of the headset;
a visual controller that:
identifies a displacement of the visual, opposite the motion, to maintain the physical position of the visual relative to a stationary reference point; and
engages the visual displacer to displace the physical position of the visual from an initial position according to the displacement; and
a visual generator that adjusts a perspective of the visual, from an initial perspective to an updated perspective, based upon the motion of the headset,
wherein the visual displacer returns the display to the initial position in association with the adjusting the perspective of the visual.