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Method for detecting touch regions of mutual capacitance screen

A touch area and mutual capacitance technology, applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc., can solve problems such as difficult to guarantee quality, affect the accuracy of touch detection accuracy, contact coordinate calculation accuracy, etc., and achieve shape And the effect of accurate size, accurate extraction, and low probability of false touch

Active Publication Date: 2013-02-27
RDA TECH
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Problems solved by technology

Since the ambient temperature and background electromagnetic noise of the mutual capacitance screen will change during the working period, it is difficult to guarantee the quality of a calibration, which will affect the accuracy of touch detection and the calculation accuracy of contact coordinates

Method used

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  • Method for detecting touch regions of mutual capacitance screen
  • Method for detecting touch regions of mutual capacitance screen
  • Method for detecting touch regions of mutual capacitance screen

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Embodiment Construction

[0028] see figure 1 , the mutual capacitance screen detection touch area detection method of the present application comprises the following steps:

[0029] In step 1, calibrate the baseline capacitance values ​​at all crosspoints.

[0030] Step 2: Measure the capacitance value of each intersection point of the mutual capacitance screen, and make a difference with the reference capacitance value of each intersection point to obtain the capacitance change amount of each intersection point.

[0031] The intersection point at which the capacitance variation is greater than the third threshold is taken as a reference point. There may be zero, one or more datum points. If the reference point is 0, it means that the mutual capacitance screen is not touched. If there are one or more reference points, it is then judged whether the capacitance variation of each reference point is greater than the capacitance variation of all intersections with the same side. If so, such a reference...

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Abstract

The invention discloses a method for detecting touch regions of a mutual capacitance screen. The method includes: step one, calibrating reference capacitance values of all cross points; step two, measuring capacitance values of all cross points, performing subtraction between the capacitance values of all cross points and the reference capacitance values of all cross points, obtaining capacitance variation of each cross point, using points which are provided with the capacitance variation larger than a third threshold and do not belong to any touch region as reference points, and using the reference points as seed points if the capacitance variation of the reference points is larger than that of the cross points with adjacent sides with the reference points; step three, using the seed points as centers, adopting a region growing method, and obtaining one or a plurality of touch regions; and step four, calculating the position of a mass center of each touch region, and using the position of the mass center as a coordinate. The method has the advantages of being accurate in touch region extraction and low in false touch probability.

Description

technical field [0001] The present application relates to a signal processing technology of a touch screen, in particular to a method for detecting a touch area of ​​a conductive object on the touch screen. Background technique [0002] According to different implementation principles, capacitive touch screens are divided into two types: self-capacitive touch screens (referred to as self-capacitive screens for short) and mutual-capacitive touch screens (referred to as mutual-capacitive screens for short). Self-capacitive screens are usually only used for single touch. Mutual capacitance screens can be used for both single-touch and multi-touch, so they are widely used. [0003] The surface of the mutual capacitance screen includes a horizontal electrode array and a vertical electrode array made of ITO film (Indium Tin Oxide, indium tin oxide, also known as tin-doped indium oxide). After the two layers of electrode arrays are stacked, any horizontal electrode has an interse...

Claims

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Application Information

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IPC IPC(8): G06F3/044
Inventor 周俊峰李倩张永恒
Owner RDA TECH
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