TECHNICAL FIELD

The present application relates to the field of capacitance detection technology and, in particular, to a capacitance detection module, a method and an electronic device.

BACKGROUND

With the development of technology, electronic devices are becoming more and more intelligent. For example, there is a kind of earphone in the market, when a user puts the earphone into the ear or removes the earphone, the earphone can automatically sense, that is, when the user puts the earphone, music could be played automatically, and the music could be paused when the user removes the earphone. This detecting principle could be implemented based on a capacitance detection module.

Specifically,FIG. 1is a schematic diagram of a capacitance detection module10provided by the prior art. As shown inFIG. 1, the capacitance detection module10includes: a sensing module11(which may be a flexible printed circuit board (FPC)) and a detecting circuit12. The upper surface of the sensing module11is provided with a sensor13, the lower surface of the sensing module11is provided with a ground unit (GND)14, and a dielectric layer15could be disposed between the sensor13and the ground unit (GND)14. When a human body approaches the sensor13, an electric field between the sensor13and the ground unit14changes, thereby the self-capacitance between them also changes. The self-capacitance refers to the capacitance value between the sensor13and the ground unit14. However, in addition to the proximity of the human body, the change in temperature may also affect the capacitance value, for example, the temperature may cause the dielectric layer15and the sensor13on the sensing module11to expand or contract. The effect of temperature on the capacitance value could be called temperature drift. In practical applications, the effect of temperature drift on the capacitance value even exceeds the change of the capacitance value when the human body approaches. For example, a rapid change in temperature causes the detecting circuit12to recognize that the user is wearing a device with such detecting circuit, but in fact the user does not wear the device at this time, or the change in temperature causes the detecting circuit12to recognize that the user has removed the device, but in fact the user does not remove the device at this time. Based on this, the prior art has a problem that the capacitance detection is affected by temperature.

SUMMARY

The present application provides a capacitance detection module, a method and an electronic device, thereby avoiding the problem that the capacitance detection is affected by temperature.

In a first aspect, the present application provides a capacitance detection module, including: a sensing module and a detecting circuit; a first sensing unit is disposed on a first surface of the sensing module, and a second sensing unit is disposed on a second surface of the sensing module; the first sensing unit and the second sensing unit are respectively connected to the detecting circuit; and the detecting circuit is configured to determine, according to a capacitance value of the first sensing unit and a capacitance value of the second sensing unit, a wearing state of a device having the capacitance detection module.

In a second aspect, the present application provides a capacitance detection method, the method is applied to a capacitance detection module, and the capacitance detection module includes: a sensing module and a detecting circuit; a sensing module and a detecting circuit; a first sensing unit is disposed on a first surface of the sensing module, and a second sensing unit is disposed on a second surface of the sensing module; the first sensing unit and the second sensing unit are respectively connected to the detecting circuit; and accordingly, the method includes: determining, according to a capacitance value of the first sensing unit and a capacitance value of the second sensing unit, the wearing state of a device having the capacitance detection module.

The present application provides a capacitance detection module, a method, and an electronic device. Since a second sensing unit is added to the capacitance detection module, a first sensing unit and the second sensing unit are simultaneously affected by temperature, but the second sensing unit does not directly touch a human skin, so when a user wears the electronic device with the capacitance detection module, the capacitance value of the first sensing unit reflects influence of temperature and touch of the human skin, and the capacitance value of the second sensing unit only reflects the influence of the temperature, based on this, a wearing state of the device having the capacitance detection module could be determined according to the capacitance values of the first sensing unit and the second sensing unit, that is, the technical solution provided by the embodiment of the present application can avoid a problem that the capacitance detection is affected by temperature.

