Patent ID: 8760403

Claim:
A hybrid human-interface device, for being operated by a user on a work surface and result in relative movement between the hybrid human-interface device and the work surface, the hybrid human-interface device comprising: a first module configured to sense a movement of the hybrid human-interface device relative to the work surface; a vertical wall inside the hybrid human-interface device; a second module, comprising: a light source configured to emit light; and an image sensor disposed on the vertical wall and having a field of view parallel to a bottom surface of the hybrid human-interface device, and configured to capture an image containing at least one light spot formed by at least one object operated by the user reflecting the light emitted by the light source directly to the image sensor; a scattering layer configured to scatter the light emitted from the light source and/or the light reflected from the object; a processor configured to identify a relative distance between the object and the light source according to the variation of the light spot of the image and to generate a positional signal of the object; wherein the scattering layer is configured to reduce the intensity of the reflected light from the finger to the image sensor.