Pressure detection structure and electronic device

An electronic device comprising:

• a processor;
• and
• a pressure detection structure, wherein the processor is connected to an output end of the pressure detection structure;
• wherein the pressure detection structure comprises a substrate, a first dielectric layer, and N piezo-resistors, wherein N≥2, and N is an integer;
• a first cavity is disposed in the substrate;
• an opening of the first cavity is provided on a first surface of the substrate;
• the first dielectric layer is fastened to the first surface of the substrate;
• and the N piezo-resistors are fastened to the first dielectric layer;
• wherein the N piezo-resistors comprise one or more first piezo-resistors and one or more second piezo-resistors, and the one or more first piezo-resistors and the one or more second piezo-resistors are made of a same material and have a same resistance value;
• wherein the N piezo-resistors and the first dielectric layer form a contact surface;
• wherein two ends, in a first direction, of a vertical projection of each first piezo-resistor on the contact surface are on two sides, in the first direction, of a vertical projection of the first cavity on the contact surface;
• the first direction is parallel to a long side of the first piezo-resistor;
• wherein a vertical projection of each second piezo-resistor on the contact surface does not overlap with the vertical projection of the first cavity on the contact surface;
• wherein the N piezo-resistors are connected at the first dielectric layer to form a Wheatstone bridge;
• when a second surface of the substrate facing the first surface is pressed by an external force, a stress is transferred to the first dielectric layer to deform the first piezo-resistor;
• and an output end of the Wheatstone bridge is the output end of the pressure detection structure;
• and
• wherein the processor is configured to:
• receive an output voltage of the Wheatstone bridge, and determine, based on the output voltage, a press operation performed on a pressure-sensitive button formed by the pressure detection structure.

A pressure detection structure, wherein the pressure detection structure comprises:

• a substrate, wherein a first cavity is disposed in the substrate, and an opening of the first cavity is provided on a first surface of the substrate;
• a first dielectric layer is fastened to a first surface of the substrate;
• and
• N piezo-resistors, fastened to the first dielectric layer, wherein N≥2, and N is an integer;
• the N piezo-resistors comprise one or more first piezo-resistors and one or more second piezo-resistors, and the one or more first piezo-resistors and the one or more second piezo-resistors are made of a same material and have a same resistance value;
• two ends, in a first direction, of a vertical projection of each first piezo-resistor on a contact surface between the N piezo-resistors and the first dielectric layer are on two sides, in the first direction, of a vertical projection of the first cavity on the contact surface;
• the first direction is parallel to a long side of the first piezo-resistor;
• a vertical projection of each second piezo-resistor on the contact surface does not overlap with the vertical projection of the first cavity on the contact surface;
• the N piezo-resistors are connected at the first dielectric layer to form a Wheatstone bridge;
• and an output end of the Wheatstone bridge is an output end of the pressure detection structure.