Fingerprint sensing device with edge-compensating structure
AssigneeFingerprint Cards AB
InventorsFrank RIEDIJK, Wouter BREVET
Life of this patent
Estimating the term…
Abstract
A fingerprint sensing system for sensing a fingerprint pattern of a finger, comprising: a sensor array including a plurality of electrically conductive sensing structures; read-out circuitry connected to each of the sensing structures for providing sensing signals indicative of a capacitive coupling between the sensing structures and the finger; first signal providing circuitry for providing a first time-varying voltage signal to at least a portion of the sensor array; at least one electrically conductive edge-compensating structure arranged outside the sensor array; and second signal providing circuitry for providing a second time-varying voltage signal to the at least one edge-compensating structure.
Claims16
A fingerprint sensing system for sensing a fingerprint pattern of a finger, comprising:
- a sensor array including a plurality of electrically conductive sensing structures;
- read-out circuitry connected to each of said sensing structures for providing sensing signals indicative of a capacitive coupling between said sensing structures and said finger;
- first signal providing circuitry for providing a first time-varying voltage signal to at least a portion of said sensor array;
- at least one electrically conductive edge-compensating structure arranged outside said sensor array;
- and
- second signal providing circuitry for providing a second time-varying voltage signal to said at least one edge-compensating structure.
A method of sensing a fingerprint pattern of a finger, using a finger sensing system comprising:
- a sensor array including a plurality of electrically conductive sensing structures;
- read-out circuitry connected to each of said sensing structures;
- first signal providing circuitry;
- at least one electrically conductive edge-compensating structure arranged outside said sensor array;
- and
- second signal providing circuitry,
- said method comprising the steps of:
- controlling said first signal providing circuitry to provide a first time-varying voltage signal to at least a portion of said sensor array;
- controlling said second signal providing circuitry to provide a second time-varying voltage signal to said at least one edge-compensating structure;
- and
- controlling said read-out circuitry to provide sensing signals indicative of a capacitive coupling between said sensing structures and said finger.
Dependencies are inferred from the claim text.