Abstract: A force sensing structure and a force sensing device including the same are provided. The force sensing structure is configured to detect a proximity of an object to the force sensor from an upside and a force applied by the object to the force touch sensor. The force sensing structure includes a first electrode and a first capacitance material layer. The first capacitance material layer is disposed adjacent to the first electrode. When the object approaches the force touch sensor, the force touch sensor is configured to detect the proximity of the object according to a first capacitance variation, and when the object contacts the force sensor and deforms of the first capacitance material layer, the force touch sensor is configured to detect the force applied by the object according to a second capacitance variation.

Abstract: A key switch is disclosed. The key switch includes an axis, a pressure sensor layer, an axis component, and a key cap. The axis support includes a first opening. The pressure sensor layer is made of a pressure-sensitive electronic material and disposed on an upper surface of the axis support. The axis component is disposed in the first opening and vertically movable with respect to the axis support and the pressure sensor layer. The keycap is mounted on the axis component and includes a lower surface facing the upper surface of the axis support. When the keycap is depressed, the lower surface of the keycap depresses the pressure sensor layer and an electronic property of the pressure sensor layer varies. An analog pressure detection system including the key switch is also disclosed.

Abstract: A resistive force sensing circuit and a resistive force sensing apparatus. The circuit includes a plurality of sensor circuit inputs, a plurality of sensor circuit outputs; and a plurality of resistor units. Each of the resistor units includes a force-sensing resistor, a first side resistor, and a second side resistor. The first terminals of the force-sensing resistor, the first side resistor and the second side resistor are electrically connected to each other at one node, a second terminal of the force-sensing resistor is electrically connected to one of the sensor circuit inputs, and second terminals of the first side resistor and the second side resistor are electrically connected to two adjacent sensor circuit outputs, respectively. The first side resistor and the second side resistor are a pair of resistors with substantially equal resistance. The apparatus includes structures to realize the function of the resistive force sensing circuit.

Abstract: A resistive force sensing circuit and a resistive force sensing apparatus. The circuit includes a plurality of sensor circuit inputs, a plurality of sensor circuit outputs; and a plurality of resistor units. Each of the resistor units includes a force-sensing resistor, a first side resistor, and a second side resistor. The first terminals of the force-sensing resistor, the first side resistor and the second side resistor are electrically connected to each other at one node, a second terminal of the force-sensing resistor is electrically connected to one of the sensor circuit inputs, and second terminals of the first side resistor and the second side resistor are electrically connected to two adjacent sensor circuit outputs, respectively. The first side resistor and the second side resistor are a pair of resistors with substantially equal resistance. The apparatus includes structures to realize the function of the resistive force sensing circuit.