Refreshing method of sensing baseline values for capacitive sensor device and capacitive sensor device

Abstract

A refreshing method of sensing baseline values for a capacitive sensor device and the capacitive sensor device are applied to confirm whether the differences between the current measured values and the factory or record baseline values are approximately equal, to determine whether to use current measured values as the sensing baseline values used in the following sensing procedure. When the differences are approximately equal, the current measured values are used as the sensing baseline values. When the differences are not approximately equal, the factory baseline values are used as the sensing baseline values, and the correcting procedure of the sensing baseline values of the sensing points is executed. In the correcting procedure, the signal characteristic of the measured value of each sensing point is detected to be high frequency or low frequency, to determine whether to refresh and when to refresh the corresponding sensing baseline values by the current measured values. Thus, the updating times of the sensing base line values can be reduced and resources can be saved.

Description

technical field [0001] The present invention relates to a capacitive touch technology, in particular to a method for updating a judgment baseline value of a capacitive sensing device and a capacitive sensing device. Background technique [0002] In order to improve the convenience of use, more and more electronic devices use a touch screen as an operation interface, so that users can directly click on the screen on the touch screen to perform operations, thereby providing more convenient and humanized operations model. A touch screen is mainly composed of a display that provides a display function and a sensing device that provides a touch function. [0003] Generally speaking, the sensing device utilizes self-capacitance sensing technology and / or mutual capacitance sensing technology to know whether the panel is touched by the user. During the sensing process, when the sensing device detects a change in the capacitance value of a certain coordinate position, the sensing d...

AI Technical Summary

Problems solved by technology

Or, if the baseline value is not updated immediately after the long-standing conductive object leaves, the remaining temperature of the original conductive object will cause a false touch in the shape of the conductive object in the block where the original conductive object is located, so that the sensing device misjudges the presence of the touch

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