Device, package structure and manufacturing method of device

A device, disposed within a wearable sound device or to be disposed within the wearable sound device, the device comprising:

• a first anchor structure and a second anchor structure;
• a first membrane portion comprising an end anchored by the first anchor structure;
• a second membrane portion comprising an end anchored by the second anchor structure;
• a first actuating portion disposed on the first membrane portion;
• and
• a second actuating portion disposed on the second membrane portion;
• wherein a vent is opened when the first actuating portion receives a first voltage so that the first membrane portion moves toward a first direction and the second actuating portion receives a second voltage so that the second membrane portion moves toward a second direction opposite to the first direction.

A device, comprising:

• a membrane, comprising an anchored end and a free end;
• and
• an actuator disposed on the membrane and configured to actuate the membrane;
• wherein the device is disposed on a base;
• wherein the membrane is actuated to hold the free end at a position, such that a segment of the membrane from the anchored end to the free end remains a flat position and parallel to the base, when a constant bias voltage is applied on the actuator;
• wherein the membrane hangs down and below the flat position when the actuator receives a ground voltage or is floating;
• wherein the actuator receives a first signal which is unipolar with respect to the ground voltage, the first signal comprises a DC (direct current) component and an AC (alternating current) component, the DC component is the constant bias voltage which holds the membrane at the flat position, and a displacement of the membrane is linear with the AC component of the first signal;
• wherein the displacement of the membrane with respect to the flat position is corresponding to the AC component with respect to the ground voltage.