Scanning configuration of two-dimensional capacitance sensor and positioning method

Abstract

The invention relates to a scanning configuration of a two-dimensional capacitance sensor and a positioning method. The scanning configuration has a single layer of electrode groups arranged on one side, wherein each electrode group comprises two touch electrodes, namely a positive touch electrode and a negative touch electrode; and during scanning, one touch electrode in each electrode group serves as a scanning end, and the other touch electrode serves as a reference end. The invention has the advantages that: the scanning configuration and the positioning method are simple; interference caused by outside noises can be effectively prevented; and interference resistance is improved, so coordinates of specific positions of touch points can be quickly and accurately found.

Description

technical field [0001] The invention relates to a scanning configuration of a sensor, in particular to a scanning configuration and a positioning method of a two-dimensional capacitive sensor. Background technique [0002] The so-called two-dimensional capacitive sensor refers to a device or device that uses the principle of capacitance to transmit signals in the X and Y directions. It can be an ITO (indium tin oxide) layer, a PCB board, a keyboard or a touch screen, etc., usually by human fingers. Or stylus actuation. In order to detect the specific position where the touch object touches the touch screen, in the existing scanning configuration of the two-digit capacitive sensor, it generally scans in a row-by-row or column-by-column manner, that is, scans one row or one column at each moment. In order to characterize the change in capacitance before and after touch, it is necessary to linearly convert the capacitance value of the scanning row or column into a quantity tha...

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Problems solved by technology

[0003] The above-mentioned row-by-row or column-by-column scanning configuration method, although the scanning method is relatively simple, but because there are differences in external interference in different time periods, the detected data is not very stable, which eventually leads to possible touch operations. It is regarded as not touched, but not touched is regarded as touched, and it cannot be accurately judged whether it is touched. When the external interference is more serious, it may even detect that the coordinates drift relative to the touched point. The above will directly lead to poor anti-interference performance and error. Judgment

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