Patent ID: 7982450

Claim:
A device for detecting and displaying an object hidden behind an obscuring surface, the hidden object having a dielectric constant, the detecting and displaying device comprising: an energy source; an electrode connected to the energy source; a chamber disposed between the electrode and the obscuring surface, comprising: a visual display material disposed in the chamber between the electrode and the hidden object, the visual display material having a visual display characteristic that is varied in response to the amount of energy applied to it by the electrode and in response to the dielectric constant of the hidden object; and a display area through which the visual display characteristic of the visual display material can be seen; wherein a change in capacitance caused by the hidden object is detected by the visual display material and the shape of the hidden object is displayed in the display area of the chamber by the varying of the visual display characteristic of the display material; whereby the visual display material is used to both detect and display the hidden object.