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Capacitance sensor and capacitive sensing device

A technology of capacitive sensor and sensing unit, which is applied in the field of capacitive sensing, can solve problems such as instability, inaccurate sensing, and misjudgment, and achieve the effect of stable sensing signal and high sensing accuracy

Inactive Publication Date: 2015-12-09
SHENZHEN SUNWAVE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, sensing signals such as voltage and electricity are easily affected by the parasitic capacitance in the capacitive sensing device during the transmission process, and are relatively unstable, resulting in inaccurate sensing or misjudgment of the capacitive sensing device. Circumstances that affect user experience

Method used

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  • Capacitance sensor and capacitive sensing device
  • Capacitance sensor and capacitive sensing device
  • Capacitance sensor and capacitive sensing device

Examples

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Embodiment Construction

[0075] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. For convenience or clarity, the thickness and size of each layer shown in the drawings and the number of related elements may be exaggerated, omitted, or schematically shown. In addition, the size of elements does not entirely reflect an actual size, and the number of related elements does not entirely reflect an actual number. The same reference numbers in the figures indicate the same or similar structures.

[0076] Furthermore, the described features and structures may be combined in any suitable manner in one or more embodiments. In the following descriptio...

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Abstract

The invention discloses a capacitance sensor and a capacitive sensing device. The capacitance sensor comprises sensing electrodes and differential pair transistors. The sensing electrodes can be coupled to a target object in a capacitance mode and used for loading reference signals. The differential pair transistors are used for responding to the reference signal change caused when the target object is close to or touches the sensing electrodes and correspondingly generating two different second alternating current signals. Sensing signals output by the capacitive sensor are stable. The capacitive sensing device with the capacitive sensor is high in sensing accuracy.

Description

technical field [0001] The invention relates to the technical field of capacitive sensing, in particular to a capacitive sensor and a capacitive sensing device. Background technique [0002] With the development of society, more and more electronic devices (such as mobile phones, tablet computers, wearable devices, and various smart products such as smart homes) are generally provided with one or more sensing devices. The sensing device includes, for example, a touch sensing device that senses a user's touch operation, a biological information sensing device that senses biological information of a human body, and the like. Currently, biometric information sensing devices and the like mostly use capacitive sensing devices to perform sensing operations. [0003] A capacitive sensing device generally includes a capacitive sensor and a control circuit. The capacitive sensor includes a plurality of sensing units (sensors). The multiple sensing units receive driving signals fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
Inventor 刘雪春
Owner SHENZHEN SUNWAVE TECH