Capacitance type sensor, sensing apparatus, sensing system and electronic device
A capacitive sensor, capacitive technology, applied in the field of electronic equipment, capacitive sensing devices, capacitive sensing systems, capacitive sensors, can solve problems such as instability, inaccurate sensing, misjudgment, etc., to achieve sensing The measurement signal is stable, the sensing accuracy is high, and the user experience is good.
Inactive Publication Date: 2016-01-06
SHENZHEN SUNWAVE TECH
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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
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[0076] 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.
[0077] 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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The invention discloses a capacitance type sensor, a sensing apparatus, a sensing system and an electronic device, wherein the capacitance type sensor comprises a plurality of sensing units; each of the sensing units comprises a sensing electrode and a sensing circuit; the sensing electrode can be coupled to a target object in a capacitance way for loading reference signals; the sensing circuit comprises a differential pair transistor; the differential pair transistor is used for responding to the change of the reference signals on the sensing electrode due to that the target object is close or in touch with the sensing electrode and further the differential pair transistor correspondingly generates different second communication signals; and the sensing signals outputted by the capacitance type sensor are more stable, thus the sensing accuracy of the capacitance type sensor provided with the sensing apparatus and the sensing system; and the user experience of the electronic device provided with the sensing apparatus or the sensing system is better.
Description
technical field [0001] The invention relates to the technical field of capacitive sensing, in particular to a capacitive sensor, a capacitive sensing device, a capacitive sensing system, and electronic equipment. 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). Th...
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IPC IPC(8): G06F3/044
CPCG06F3/0443G06F3/0446
Inventor 刘雪春
Owner SHENZHEN SUNWAVE TECH