Self-coupling capacitor detection method and circuit

A capacitance detection and auto-coupling technology, applied in the electronic field, can solve the problems of unstable speed of the auto-capacitor detection scheme, and achieve the effect of solving the speed instability.

Active Publication Date: 2014-03-26
HUAWEI DEVICE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Embodiments of the present invention provide an autocapacitance detection method and circuit, which can solve the problem of unstable speed of the autocapacitance detection scheme

Method used

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  • Self-coupling capacitor detection method and circuit
  • Self-coupling capacitor detection method and circuit

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Embodiment Construction

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0037] Embodiments of the present invention provide an autocapacitance detection method, such as figure 1 shown, including the following steps:

[0038] 101. The autocapacitance detection circuit sends a transmission signal through the transmission port, and the number of pulses of the transmission signal is fixed within a preset fixed time period.

[0039] Optionally, the transmit signal includes but is not limited to a square wave, a triangle wave or a sine...

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Abstract

The embodiment of the invention provides a self-coupling capacitor detection method and circuit, and relates to the field of electronics. The self-coupling capacitor detection method and circuit solve the problem that according to a common self-coupling capacitor detection scheme, the speed is not stable. The method specifically includes the steps of sending an emission signal with a fixed pulse number in a preset fixed cycle, receiving a first receiving signal and a second receiving signal of the emission signal which passes a load through a receiving port, judging a change value delta C of a self-coupling capacitor at the receiving port by comparing the voltage difference of the first receiving signal and the second receiving signal at a rising edge and a falling edge, and judging that a touch even occurs at a touch port connected with the receiving port when the change value delta C of the self-coupling capacitor exceeds a preset comparison value. The self-coupling capacitor detection method and circuit are used for detecting the self-coupling capacitor.

Description

technical field [0001] The invention relates to the field of electronics, in particular to an autocapacitance detection method and circuit. Background technique [0002] The structure of the capacitive touch screen is mainly to coat a transparent film body layer on the glass screen, and then add a piece of protective glass outside the conductor layer. The capacitive touch screen is coated with narrow and long electrodes on the four sides of the touch screen to form a low voltage in the conductor. AC electric field. When touching the screen, due to the electric field of the human body, a coupling capacitance will be formed between the finger and the conductor layer, and the current from the electrodes on the four sides will flow to the contacts, and the current strength is proportional to the distance from the finger to the electrode. The controller behind the touch screen is then It will calculate the proportion and strength of the current, and accurately calculate the posi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
Inventor 刘海龙
Owner HUAWEI DEVICE CO LTD
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