US Patent 10572011 Haptic feedback system

Examples are disclosed that relate to providing haptic feedback. One example provides a haptic feedback system comprising a wearable device configured to be worn by a user, the wearable device including a fluidic channel, a fluid disposed within the fluidic channel, the fluid including an adjustable viscosity, a circuit configured to vary a field within the fluidic channel, and a controller. The controller is configured to receive a first input, and in response to receiving the first input, apply a first field within the channel via the circuit to set the adjustable viscosity of the fluid to a first viscosity, and receive a second input, and in response to receiving the second input, apply a second field within the channel via the circuit to set the adjustable viscosity of the fluid to a second viscosity.