Patent ID: 11900712
Assignee: INTEGRATED BIOMETRICS, LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 19:
20. A system for capturing a fingerprint print image, comprising:
an electrophoretic display comprising:
a protective layer comprising a free surface for receiving a target finger;
a transparent electrode layer;
an electro-optical material layer disposed in contact with the electrode layer, between the protective layer and the transparent electrode layer, the electro-optical material layer comprising micro-capsules comprising a negatively charged dark-colored pigment and light-colored pigment suspended in transparent fluid;

a contact electrode positioned proximate the electrophoretic display to operably contact the target finger subjected to fingerprinting; and
a direct current (DC) electrical bias source, the DC electrical bias source electrically coupled with the contact electrode to provide positive potential, and the DC electrical bias source electrically coupled with the electrode layer to provide negative potential; and
a transistor array disposed beneath the transparent electrode layer, and comprising a plurality of pixels, and configured to convert an optical signal incident upon a pixel into an electrical charge;
wherein bringing the biometric object in contact with the contact electrode and the free surface completes an electrical circuit between the contact electrode and the transparent electrode resulting in the dark-colored pigment of the microcapsules becoming visible at the free surface of the electrophoretic display merely at a location of contact of the biometric object with the surface of the electrophoretic display, thereby generating an print image at the free surface of a print of a portion of the biometric object that contacts the electrophoretic display; and
wherein the generating of the print image at the free surface of a print of the portion of the biometric object that contacts the electrophoretic display further generates a negative version of the print image at the opposing side of the electro-optical material layer viewable through the transparent electrode.