Method for capture of a fingerprint using an electro-optical material

A method for acquisition of a static fingerprint image onto an artifact comprising an electro-optical material, the method comprising:

• connecting a first node of a direct current (DC) potential to a finger;
• coupling a second node of the direct current (DC) potential to an electrophoretic display, the electrophoretic display comprising:
• an electro-optical material that exhibits a change in visible appearance in response to the application of an electric field;
• a transparent protective layer;
• a transparent electrode layer;
• wherein the electro-optical material comprises micro-capsules in contact with the transparent electrode layer that comprise negatively charged dark pigment suspended in a transparent fluid;
• bringing the finger into contact with a free surface of the electrophoretic display, thereby completing an electrical circuit between the first node and second node of the DC potential, wherein completing the electrical circuit between the first node and second node of the DC potential applies a positive charge to the free surface of the electrophoretic display resulting in the dark pigment of the microcapsules becoming visible at the surface of the electrophoretic display merely at a location of contact of the finger with the surface of the electrophoretic display, due to the negative charge of the dark pigment, thereby generating a fingerprint image;
• capturing an image of the fingerprint image using an imaging apparatus;
• storing the captured image electronically;
• and
• decoupling the electro-optical material from the direct current (DC) potential following the acquisition of the fingerprint image.