Wearable devices with interfering bladders for creating haptic feedback

1. A haptic device comprising:

a wearable structure to be worn on a portion of a user's body; and

at least one inflatable bladder, coupled to the wearable structure, that includes two or more pockets positioned at a target location on the wearable structure,

wherein:

the two or more pockets are configured to, when inflated, impart one or more directional forces onto the user at the target location that impede movement of the portion of the user's body;

the one or more directional forces are caused by the two or more pockets interfering with each other, when inflated; and

a magnitude of the one or more directional forces corresponds to a fluid pressure inside the two or more pockets and a change in geometry of the two or more pockets caused by the two or more pockets interfering with each other.

2. The haptic device of claim 1 , wherein two or more pockets comprise:

a first pocket with an end portion and a body portion; and

a second pocket with an end portion and a body portion, wherein: (i) the end portion of the second pocket is coupled with the end portion of the first pocket to form a connection point, and (ii) the body portion of the second pocket is decoupled from the body portion of the first pocket.

3. The haptic device of claim 2 , wherein:

when the two or more pockets are inflated, the first and second pockets are configured to expand such that the body portion of the second pocket and the body portion of the first pocket fan out away from the connection point; and

when the two or more pockets are not inflated, the first and second pockets are configured to collapse such that the body portion of the second pocket and the body portion of the first pocket are adjacent to each other.

4. The haptic device of claim 1 , wherein:

the at least one inflatable bladder further comprises an elongated substrate forming a first side of the respective inflatable bladder; and

the two or more pockets (i) are coupled to and distributed along a length of the elongated substrate and (ii) form a second side of the respective inflatable bladder.

5. The haptic device of claim 4 , wherein:

when the two or more pockets are inflated, each pocket is configured to expand and interfere with at least one other pocket of the two or more pockets; and

when the two or more pockets are not inflated, the two or more pockets do not impede free movement of the portion of the user's body.

6. The haptic device of claim 4 , wherein:

the elongated substrate has a first elasticity; and

the two or more pockets have a second elasticity that is greater than the first elasticity.

7. The haptic device of claim 6 , wherein:

the elongated substrate is made from an inelastic textile; and

the two or more pockets are made from an elastic polymer.

8. The haptic device of claim 4 , wherein:

the portion of the user's body is a hand of the user; and

the elongated substrate is sized to fit along a palmar side of a first finger of the user's hand.

9. The haptic device of claim 1 , wherein:

the portion of the user's body is a hand of the user;

the target location is a finger joint on the user's hand; and

the one or more directional forces imparted onto the user at the target location impede flexion of the user's finger.

10. The haptic device of claim 1 , further comprising a grounding assembly that is configured to secure the wearable structure and the at least one inflatable bladder to the user's body.

11. The haptic device of claim 1 , wherein:

the two or more pockets have a predefined shape when inflated to a predefined pressure; and

the predefined shape is dependent, at least in part, on a wall thickness of each pocket of the two or more pockets.

12. The haptic device of claim 1 , wherein:

the at least one inflatable bladder is fluidically coupled to a source; and

the two or more pockets are further configured to (i) receive a fluid from the source and (ii) expand in proportion with a fluid pressure inside each pocket.

13. The haptic device of claim 12 , further comprises a switchable valve that is configured to switch between an open state and a closed state,

wherein the switchable valve prevents the fluid from exiting the two or more pockets when in the closed state.

14. The haptic device of claim 12 , wherein:

the source is in communication with a computing device; and

the source is configured to change the fluid pressure of the two or more pockets in response to receiving one or more signals from the computing device.

15. The haptic device of claim 14 , wherein:

the computing device is in communication with a head-mounted display that presents content to the user, the head-mounted display including an electronic display; and

the one or more signals correspond to content displayed on the electronic display.

16. The haptic device of claim 14 , further comprising one or more sensors, coupled to the wearable structure, configured to generate spatial and motion data corresponding to the user's movements,

wherein the spatial and motion data are communicated to the computing device.

17. The haptic device of claim 16 , wherein:

the one or more signals further correspond to the spatial and motion data corresponding to the user's movements; and

the one or more signals are generated by the computing device to impede movement of the portion of the user's body.

18. The haptic device of claim 1 , wherein the one or more directional forces imparted onto the user at the target location simulate forces induced by physical objects at the target location during natural-object interaction.

19. An artificial-reality device comprising: a pressure source;

a computer in communication with the pressure source; and

a haptic device that includes:

a wearable structure configured to be worn on a portion of a user's body; and

at least one inflatable bladder, coupled to the wearable structure, that includes two or more pockets positioned at a target location on the wearable structure, wherein the two or more pockets are configured to, when inflated by the pressure source, impart one or more directional forces onto the user at the target location that impede movement of the portion of the user's body, and wherein a magnitude of the one or more directional forces corresponds to a fluid pressure inside the two or more pockets and a change in geometry of the two or more pockets caused by the two or more pockets interfering with each other.