Touch sensor device

A touch sensor device comprising a sensor pad disposed on a carrier, wherein the sensor pad comprises:

• a first electrode;
• a second electrode, wherein the first electrode surrounds a periphery of the second electrode and a first gap is formed between the first electrode and the second electrode;
• a third electrode, wherein the first electrode surrounds a periphery of the third electrode, and a second gap is formed between the first electrode and the third electrode;
• a grounding electrode, surrounding a periphery of the pad sensor, wherein a third gap is formed between the first electrode and the grounding electrode;
• and
• a shielding film disposed on the carrier and located at a side of the sensor pad, wherein the shielding film reveals the sensor pad,
• a backside shielding film disposed on the carrier, wherein the shielding film and the backside shielding film are located at opposite sides of the carrier, and the backside shielding film covers a region corresponding to the sensor pad.