Force detection apparatus and method, touch device and electronic terminal

A force detection method, comprising:

• detecting capacitances of a first detection capacitor comprising a force detection electrode and a second detection capacitor comprising a reference detection electrode, the first detection capacitor and the second detection capacitor being both connected to a differential circuit, wherein the force detection electrode and the reference detection electrode are arranged within a surface, such that the first detection capacitor and the second detection capacitor are simultaneously coupled to the interference signal causing interference to force detection, the capacitance of the first detection capacitor is greater than a capacitance of the second detection capacitor for force detection with an area of the reference detection electrode being less than an area of the force detection electrode;
• and
• performing differential processing for the capacitances of the first detection capacitor and the second detection capacitor during force detection to cancel the interference signal to determine a force value,
• wherein the first detection capacitor is electrically connected to a first adjustable capacitor configured to adjust the capacitance of the first detection capacitor during force detection, and the first adjustable capacitor is grounded, and/or the second detection capacitor is electrically connected to a second adjustable capacitor configured to adjust capacitance of the second detection capacitor during force detection, and the second adjustable capacitor is grounded.

A touch device, comprising a force detection apparatus, the force detection apparatus comprising:

• a differential circuit;
• a first detection capacitor connected to the differential circuit;
• and
• a second detection capacitor connected to the differential circuit and configured to perform differential processing for a capacitance of the first detection capacitor to cancel an interference signal;
• wherein the first detection capacitor comprises a force detection electrode, and the second detection capacitor comprises a reference detection electrode, the force detection electrode and the reference detection electrode being arranged within a surface, such that the first detection capacitor and the second detection capacitor are simultaneously coupled to the interference signal causing interference to force detection, the capacitance of the first detection capacitor is greater than a capacitance of the second detection capacitor for force detection with an area of the reference detection electrode being less than an area of the force detection electrode, and
• wherein the first detection capacitor is electrically connected to a first adjustable capacitor configured to adjust the capacitance of the first detection capacitor during force detection, and the first adjustable capacitor is grounded, and/or the second detection capacitor is electrically connected to a second adjustable capacitor configured to adjust capacitance of the second detection capacitor during force detection, and the second adjustable capacitor is grounded.

An electronic terminal, comprising a touch device, wherein the touch device comprises a force detection apparatus comprising:

• a differential circuit;
• a first detection capacitor connected to the differential circuit;
• and
• a second detection capacitor connected to the differential circuit and configured to perform differential processing for a capacitance of the first detection capacitor to cancel an interference signal;
• wherein the first detection capacitor comprises a force detection electrode, and the second detection capacitor comprises a reference detection electrode, the force detection electrode and the reference detection electrode being arranged within a surface, such that the first detection capacitor and the second detection capacitor are simultaneously coupled to the interference signal causing interference to force detection, the capacitance of the first detection capacitor is greater than a capacitance of the second detection capacitor for force detection with an area of the reference detection electrode being less than an area of the force detection electrode, and
• wherein the first detection capacitor is electrically connected to a first adjustable capacitor configured to adjust the capacitance of the first detection capacitor during force detection, and the first adjustable capacitor is grounded, and/or the second detection capacitor is electrically connected to a second adjustable capacitor configured to adjust capacitance of the second detection capacitor during force detection, and the second adjustable capacitor is grounded.