Capacitance detection apparatus and electronic device

Patent metadata

Field	Value
Publication number	US-11366549-B2
Application number	US-202017137641-A
Country	US
Kind code	B2
Filing date	Dec 30, 2020
Priority date	Jun 23, 2020
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

Provided are a capacitance detection apparatus and an electronic device. The capacitance detection apparatus includes: a chip; and a detection electrode layer, where the detection electrode layer is integrally disposed with the chip and electrically connected to the chip, the detection electrode layer includes at least one detection electrode configured to form at least one capacitance detection channel, the at least one capacitance detection channel is respectively configured to output at least one capacitance detection signal, and the chip is configured to process the at least one capacitance detection signal.

First claim

What is claimed is:

1. A capacitance detection apparatus, wherein the capacitance detection apparatus is applied to an electronic device and comprises:
a chip, wherein the chip is a diced chip or a chip to be packaged; and
a detection electrode layer, wherein the detection electrode layer is integrally disposed with the chip and electrically connected to the chip, and the detection electrode layer is an electroplating layer disposed on a surface of the chip, the detection electrode layer comprises at least one detection electrode configured to form at least one capacitance detection channel, the at least one capacitance detection channel is respectively configured to output at least one capacitance detection signal, and the chip is configured to process the at least one capacitance detection signal;
wherein the at least one capacitance detection signal is used for at least one of: wearing detection, in-box detection, proximity detection, touch detection or pressure detection, and
wherein the capacitance detection apparatus further comprises:
a shielding electrode layer configured to output a signal with same frequency, phase and amplitude as the at least one capacitance detection signal to form a shielding electric field,
wherein the shielding electrode layer surrounds the detection electrode layer, and the shielding electric field is used to reduce curvature of an induction line in an induced electric field generated by the at least one detection electrode.

2. The capacitance detection apparatus according to claim 1 , wherein the detection electrode layer is disposed inside a circuit layer of the chip or on a surface of the circuit layer.

3. The capacitance detection apparatus according to claim 1 , wherein the capacitance detection apparatus further comprises:
a packaging layer,
wherein the packaging layer is configured to package the chip to form a capacitance detection module, and the detection electrode layer is disposed inside the packaging layer or on a surface of the packaging layer.

4. The capacitance detection apparatus according to claim 3 , wherein the capacitance detection apparatus further comprises:
a reference electrode configured to compensate for temperature drift of the detection electrode layer and/or a temperature sensor configured to detect temperature,
wherein the reference electrode is electrically connected to the chip, the temperature sensor is electrically connected to the reference electrode or/and the chip, and the temperature sensor is configured to trigger the reference electrode to compensate for the at least one capacitance detection signal, and the chip is configured to obtain the at least one capacitance detection signal and a compensation signal, and output a signal for indicating a detection result.

5. The capacitance detection apparatus according to claim 1 , wherein the detection electrode layer is connected to the chip through a conductive member.

6. The capacitance detection apparatus according to claim 1 , wherein the shielding electrode layer and the detection electrode layer are located in the same plane.

7. The capacitance detection apparatus according to claim 1 , wherein the capacitance detection apparatus further comprises:
a reference electrode configured to compensate for temperature drift of the detection electrode layer and/or a temperature sensor configured to detect temperature,
wherein the reference electrode is electrically connected to the chip, the temperature sensor is electrically connected to the reference electrode or/and the chip, and the temperature sensor is configured to trigger the reference electrode to compensate for the at least one capacitance detection signal, and the chip is configured to obtain the at least one capacitance detection signal and a compensation signal, and output a signal for indicating a detection result.

8. The capacitance detection apparatus according to claim 1 , wherein a connecting portion is provided at one end of the capacitance detection apparatus, and the connecting portion is configured to be connected to an external electrode provided on an outside of the capacitance detection apparatus in the electronic device.

9. The capacitance detection apparatus according to claim 8 , wherein a signal output by the external electrode is used for at least one of: wearing detection, in-box detection, proximity detection, human-computer interaction detection, or pressure detection.

10. The capacitance detection apparatus according to claim 1 , wherein the capacitance detection apparatus further comprises:
a hub,
wherein the chip is connected to a processor of the electronic device through the hub to realize communication between the capacitance detection apparatus and the electronic device.

11. The capacitance detection apparatus according to claim 1 , wherein the chip comprises a wafer and a circuit layer, and the detection electrode layer is electroplated to a surface of the wafer.

12. The capacitance detection apparatus according to claim 1 , wherein the detection electrode layer is integrally disposed with the chip, which can ensure that a minimum distance between the capacitance detection apparatus and an object to be detected is greater than or equal to a preset threshold, and further, a detection accuracy of the at least one capacitance detection signal meets detection requirements of the capacitance detection apparatus.

13. An electronic device, comprising:
a capacitance detection apparatus applied to an electronic device, wherein the capacitance detection apparatus comprises:
a chip, wherein the chip is a diced chip or a chip to be packaged; and
a detection electrode layer, wherein the detection electrode layer is integrally disposed with the chip and electrically connected to the chip, and the detection electrode layer is an electroplating layer disposed on the surface of the chip, the detection electrode layer comprises at least one detection electrode configured to form at least one capacitance detection channel, the at least one capacitance detection channel is respectively configured to output at least one capacitance detection signal, and the chip is configured to process the at least one capacitance detection signal;
wherein an external electrode of the electronic device is an antenna of the electronic device, and a signal output by the external electrode is used for at least one of: wearing detection, in-box detection, proximity detection, touch detection or pressure detection, and
wherein the capacitance detection apparatus further comprises:
a shielding electrode layer configured to output a signal with same frequency, phase and amplitude as the at least one capacitance detection signal to form a shielding electric field,
wherein the shielding electrode layer surrounds the detection electrode layer, and the shielding electric field is used to reduce curvature of an induction line in an induced electric field generated by the at least one detection electrode.

14. The electronic device according to claim 13 , wherein the electronic device is an earphone, and the earphone further comprises:
a housing and a main board disposed in the housing,
wherein the capacitance detection apparatus is disposed on an inner wall of the housing or the capacitance detection apparatus is disposed on the main board.

15. The electronic device according to claim 14 , wherein the capacitance detection apparatus is fixedly connected to an inner side surface of the housing or the main board through an adhesive layer.

Assignees

• Shenzhen Goodix Tech Co Ltd

Inventors

• Feng Lin
• Yang Wangwang

Classifications

• H03K2217/960765

  Details of shielding arrangements · CPC title

• H03K2217/96023

  Details of electro-mechanic connections between different elements, e.g.: sensing plate and integrated circuit containing electronics · CPC title

• H03K2217/960745

  Capacitive differential; e.g. comparison with reference capacitance · CPC title

• H03K17/955

  using a capacitive detector · CPC title

• G01R27/2605 Primary

  Measuring capacitance (capacitive sensors G01D5/24) · CPC title