Passive Haptic Feedback

Tactile information provided to a user by the inherent physical properties of a device or interface, without any active actuation. Examples include the raised bezel around a touch screen, the tactile bump on the F and J keys of a keyboard, a notched dial, or the edge of a trackpad. Passive haptic feedback gives users — especially blind users or users with motor impairments — a stable reference point they can feel, supporting eyes-free orientation, target acquisition, and movement stabilisation. It contrasts with active haptic feedback, which requires a vibrator, force-feedback motor, or electrotactile actuator to generate sensations on demand.