Touch button state determination method

A button and status technology, applied in the direction of electrical components, pulse technology, electronic switches, etc., can solve problems such as false touches, water droplets or electromagnetic interference cannot be distinguished, and are easily affected by the surrounding environment, so as to reduce false touches and anti-interference capabilities strong effect

Inactive Publication Date: 2012-04-25
SUZHOU PIXCIR MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0003] The existing method for judging the state of capacitive touch buttons is to first determine the reference value when the button is not touched, and then judge the touch value according to the capacitance increase value after the touch object is touched. Whether the control object is touched or not, this method is easily affected by the surrounding environment, and it cannot be judged for water droplets or electromagnetic interference, and it is easy to cause false touches, so it is necessary to provide a method that can accurately judge the state of the touch button

Method used

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0010] see figure 1 and figure 2 , The method for judging the state of the touch key of the present invention needs to pre-set the touch object press threshold C1 and the touch object release threshold C2, the touch object press threshold C1 and the touch object release threshold C2 are fixed values. The thresholds include the touch object press threshold C1 and the touch object release threshold C2, and the touch object press threshold C1 is greater than the noise value, and the maximum signal of the touch key when the touch object does not touch the key is obtained by scanning The value C3 and the current state value C4 of the touch key. And define a press difference and a release difference, wherein the press difference is the value of the initially detected maximum signal value C3 minus the value of the touch object pressing threshold C1, a...

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Abstract

The invention provides a touch button state determination method which comprises the following steps: scanning a touch button, and detecting a largest signal value of a touch control object when not touching the button; continuing to detect a present state value of the touch button; according to the present state value and the largest signal value, determining a state of the touch button. According to the method, the largest signal value is taken as a benchmark value, wrong touch can be reduced, and anti-interference capability is strong.

Description

technical field [0001] The invention relates to a method for judging the state of a touch key, in particular to a method for judging the state of a capacitive touch key. Background technique [0002] The original mechanical buttons generally realize functional operations by pressing, rotating, etc., which are easy to wear and have a short service life, and are gradually replaced by touch buttons. Touch buttons mainly include resistive touch buttons and capacitive touch buttons. Resistive touch buttons need to use conductive films, and conductive films have low durability and reduce light transmission, while capacitive touch buttons rely on human hand sensing to detect capacitance changes. The appearance is beautiful and the service life is long, which is more favored by people. [0003] The existing method for judging the state of a capacitive touch button is to first determine the reference value when the button is not touched, and then judge whether the touch object is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/975
Inventor 杜小雷
Owner SUZHOU PIXCIR MICROELECTRONICS
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