Pressure sensor and electronic device having a second output terminal of a wheatstone bridge and a second terminal of a heat emitting diode being configured for outputting electrical signals

An electronic device, comprising:

• an organic light-emitting diode (OLED) display;
• and
• a processor,
• wherein the OLED display comprises a pressure sensor configured to output an electrical signal corresponding to a touch pressure of the OLED display to the processor;
• and
• wherein the pressure sensor comprises:
• a Wheatstone bridge;
• and
• a heat emitting diode,
• wherein the Wheatstone bridge comprises a first resistor, a second resistor, a third resistor, and a fourth resistor;
• wherein the first resistor, the second resistor, the third resistor, and the fourth resistor are coupled to form a loop, a coupling point of the first resistor and the second resistor serves as a first input terminal of the Wheatstone bridge, a coupling point of the third resistor and the fourth resistor serves as a second input terminal of the Wheatstone bridge, a coupling point of the second resistor and the fourth resistor serves as a first output terminal of the Wheatstone bridge and is coupled to a first terminal of the heat emitting diode, and a coupling point of the first resistor and the third resistor serves as a second output terminal of the Wheatstone bridge;
• wherein the first resistor, the second resistor, and the third resistor are fixed resistors, and the fourth resistor is a varistor;
• wherein based on an increase in temperature, an equivalent resistance of the heat emitting diode decreases, and a resistance of the fourth resistor increases;
• wherein based on a decrease in temperature, the equivalent resistance of the heat emitting diode increases, and the resistance of the fourth resistor decreases;
• and
• wherein the first input terminal and the second input terminal of the Wheatstone bridge are configured to input a constant voltage or a pulse voltage, and the second output terminal of the Wheatstone bridge and the second terminal of the heat emitting diode are configured to output an electrical signal.