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Capacitive touch device for detecting induced electric field

A technology of capacitive touch and electric field induction, which is applied in the fields of electrical digital data processing, input/output process of data processing, instruments, etc., can solve the problems affecting the accuracy and stability of capacitive touch devices, etc.

Inactive Publication Date: 2014-09-17
李祥宇 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such variation is much smaller than that of the electric field. Therefore, if the electric field of the human body and the electric field of the ground are treated as noise, the accuracy and stability of the capacitive touch device will be greatly affected.

Method used

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  • Capacitive touch device for detecting induced electric field
  • Capacitive touch device for detecting induced electric field
  • Capacitive touch device for detecting induced electric field

Examples

Experimental program
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Embodiment Construction

[0033] Please refer to figure 1 , which is a first circuit structure diagram of a preferred embodiment of the present invention, including: a differential amplifier 1, an impedance 2, and a signal judging circuit 3. Wherein, the differential amplifier 1 includes a first input terminal 11 , a second input terminal 12 , and an output terminal 13 . The first input terminal 11 is electrically connected to a contact element 10, and the second input terminal 12 is connected to ground. In this embodiment, the first input terminal 11 is a positive input terminal, and the second input terminal 12 is a negative input terminal. Preferably, the contact element 10 can be a touch button, a slider, a shuttle, or a touch panel. The impedance 2 is electrically connected to the first input terminal 11 and the second input terminal 12 of the differential amplifier 1. Preferably, the impedance 2 can be a high-impedance resistor, a high-impedance capacitor, or a parallel connection between a res...

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PUM

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Abstract

The invention relates to a capacitive touch device for detecting an induced electric field. The capacitive touch device comprises a differential amplifier, impeders and a signal judgment circuit, wherein the differential amplifier is electrically connected to a contact element; the impeders are electrically connected to a first input end and a second input end of the differential amplifier; the signal judgment circuit is electrically connected to an output end of the differential amplifier; and when the contact element receives an induced electric field signal, the differential amplifier amplifies the induced electric field signal, and the signal judgment circuit judges whether the amplified induced electric field signal is a touch input signal.

Description

technical field [0001] The invention relates to a capacitive touch device, in particular to a capacitive touch device for detecting an induced electric field. Background technique [0002] In the research and development of capacitive touch devices, the main factor affecting self-capacitance is the electric field of the human body, and the electric field of the human body is affected by the electric field of the earth. Since the electric field has positive and negative points, there will be a difference between increasing the capacitance and reducing the capacitance for the self-capacitance. This will cause instability in the measurement and is often mistaken for noise processing. [0003] In addition, the area and distance of the contact points on the touch device will affect the increase of the self-capacitance and also affect the magnitude of the induced electric field. Most of the known technologies use the characteristic of capacitance increase to measure contact or no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/044
Inventor 李祥宇林丙村
Owner 李祥宇