US Patent 9483126 Smart variable torque display

In one example an electronic device comprises a controller, a chassis comprising a first section and a second section, and a hinge assembly to connect the first section of the chassis to the second section of the chassis comprising a shaft rotatable about a first axis, a brake selectively engageable with a portion of the shaft, and an electroactive polymer (EAP) actuator coupled to the brake, wherein the EAP actuator selectively engages the brake with a portion of the shaft in response to a signal from the controller. Other examples may be described.