Patent ID: 8456438

Claim:
A user interface comprising: a substrate defining a fluid channel connected to a cavity; a tactile layer comprising a tactile surface, a deformable region of the tactile layer cooperating with the substrate to define the cavity, and an undeformable region of the tactile layer coupled to the substrate substantially proximal a perimeter of the cavity; a set of discrete beads arranged within the cavity and disconnected from the deformable region and the substrate, the set of discrete beads configured to support the deformable region against substantial inward deformation; a filter arranged within the fluid channel and configured to prevent displacement of a bead, in the set of discrete beads, through a portion of the fluid channel and into the displacement device; a displacement device coupled to the fluid channel and configured to displace fluid through the fluid channel to transition the deformable region from a retracted setting to an expanded setting that is tactilely distinguishable from the retracted setting at the tactile surface; and a sensor coupled to the substrate and configured to detect an input at the tactile surface.