An air pulse generating element (20, 60), comprising a membrane (205, 605), a chamber (208, 608), in which the membrane (205, 605) is disposed, a first faceplate (206, 606), a second faceplate (207, 607), a plurality of valves (201-204, 601-604), disposed by the membrane, configured to seal a plurality of openings (211-214, 611-614) of the chamber (208, 608), in response to a plurality of valve control signals, wherein the membrane (205, 605) and the plurality of valves (201-204, 601-604) are all disposed at a first layer, the air pulse generating element being characterized in that the plurality of valves (201-204, 601-604) comprises: a first valve (201, 601), configured to seal a first opening (211, 611) of the chamber (208, 608) in response to a first valve control signal, wherein the first opening (211, 611) is formed on the first faceplate (206, 606), and the first faceplate (206, 606) is disposed at a second layer (Layer 1); a second valve (202, 602), configured to seal a second opening (212, 612) of the chamber (208, 608) in response to a second valve control signal, wherein the second opening (212, 612) is formed on the second faceplate (207, 607), and the second faceplate (207, 607) is disposed at a third layer (Layer 5); a third valve (203, 603), configured to seal a third opening (213, 613) of the chamber (208, 608) in response to a third valve control signal, wherein the third opening (213, 613) is formed on the first faceplate (206, 606); and a fourth valve (204, 604), configured to seal a fourth opening (214, 614) of the chamber (208, 608) in response to a fourth valve control signal, wherein the fourth opening (214, 614) is formed on the second faceplate (207, 607), wherein the first valve (201, 601), the second valve (202, 602), the third valve (203, 603) and the fourth valve (204, 604) are coplanar with the membrane (205, 605). a first faceplate (206, 606), a second faceplate (207, 607), a plurality of valves (201-204, 601-604), disposed by the membrane, configured to seal a plurality of openings (211-214, 611-614) of the chamber (208, 608), in response to a plurality of valve control signals, wherein the membrane (205, 605) and the plurality of valves (201-204, 601-604) are all disposed at a first layer, the air pulse generating element being characterized in that the plurality of valves (201-204, 601-604) comprises: a first valve (201, 601), configured to seal a first opening (211, 611) of the chamber (208, 608) in response to a first valve control signal, wherein the first opening (211, 611) is formed on the first faceplate (206, 606), and the first faceplate (206, 606) is disposed at a second layer (Layer 1); a second valve (202, 602), configured to seal a second opening (212, 612) of the chamber (208, 608) in response to a second valve control signal, wherein the second opening (212, 612) is formed on the second faceplate (207, 607), and the second faceplate (207, 607) is disposed at a third layer (Layer 5); a third valve (203, 603), configured to seal a third opening (213, 613) of the chamber (208, 608) in response to a third valve control signal, wherein the third opening (213, 613) is formed on the first faceplate (206, 606); and a fourth valve (204, 604), configured to seal a fourth opening (214, 614) of the chamber (208, 608) in response to a fourth valve control signal, wherein the fourth opening (214, 614) is formed on the second faceplate (207, 607), a first valve (201, 601), configured to seal a first opening (211, 611) of the chamber (208, 608) in response to a first valve control signal, wherein the first opening (211, 611) is formed on the first faceplate (206, 606), and the first faceplate (206, 606) is disposed at a second layer (Layer 1); a second valve (202, 602), configured to seal a second opening (212, 612) of the chamber (208, 608) in response to a second valve control signal, wherein the second opening (212, 612) is formed on the second faceplate (207, 607), and the second faceplate (207, 607) is disposed at a third layer (Layer 5); a third valve (203, 603), configured to seal a third opening (213, 613) of the chamber (208, 608) in response to a third valve control signal, wherein the third opening (213, 613) is formed on the first faceplate (206, 606); and a fourth valve (204, 604), configured to seal a fourth opening (214, 614) of the chamber (208, 608) in response to a fourth valve control signal, wherein the fourth opening (214, 614) is formed on the second faceplate (207, 607), wherein the first valve (201, 601), the second valve (202, 602), the third valve (203, 603) and the fourth valve (204, 604) are coplanar with the membrane (205, 605).