Fingerprint sensing system and method utilizing 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 a set of the sensing structures in the plurality of sensing structures;
• 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.