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Locating method for self-capacitance type touch screen

A positioning method and self-capacitance technology, applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc., can solve problems such as judgment errors, and achieve the effect of easy promotion

Inactive Publication Date: 2014-04-09
王文洲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the real touch point cannot be distinguished from the ghost point, a judgment error will occur during the positioning process

Method used

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  • Locating method for self-capacitance type touch screen
  • Locating method for self-capacitance type touch screen
  • Locating method for self-capacitance type touch screen

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Embodiment Construction

[0036] In order to allow those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described below in conjunction with the accompanying drawings.

[0037] The specific embodiment of the present invention is as Figure 1 ~ Figure 3 As shown, a positioning method for a self-capacitive touch screen is applied to a self-capacitive touch screen with pressure-sensitive materials added, and two contacts are taken as an example to illustrate below. The concrete steps of this method are as follows:

[0038] S1: module initialization;

[0039] S2: The capacitance-to-digital converter starts scanning;

[0040] S3: The driving line sends out driving signals column by column;

[0041] S4: The sensing line sends sensing signals column by column;

[0042] S5: storing the received driving signal and sensing signal in the MCU;

[0043] S6: repeat scanning N times;

[0044] S7: Perform mean value processing on the...

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Abstract

The invention relates to a locating method for a self-capacitance type touch screen. The locating method for the self-capacitance type touch screen comprises the steps of carrying out module initialization, carrying out starting, carrying out drive scanning of a capacitance digital converter, acquiring collected analog data signals, outputting digital signals through an analog-digital converter, judging whether a single contact or multiple contacts exist, further determining the positions of the contacts, and transmitting obtained contact position information to an upper computer. Compared with the prior art, the locating method for the self-capacitance type touch screen has the advantages that a pressure parameter is introduced to serve as an index of the detection standard, the positions of the contacts can be correctly judged, and the locating method is free of the complex operation process, simple, and easy to implement and popularize.

Description

technical field [0001] The invention relates to the technical field of touch screen positioning, in particular to a positioning method for a self-capacitive touch screen. Background technique [0002] The touch screen has been widely used in various electronic products due to its small mechanical loss and small size. Touch screens include resistive touch screens and capacitive touch screens. With the advancement of technology, self-capacitive touch screens are more and more widely used in various devices. During touch detection, the self-capacitance screen detects the horizontal and vertical electrode arrays in turn, and determines the abscissa and ordinate of the touch position according to the change in capacitance before and after the touch, and then combines them into plane coordinates. The self-capacitance scanning method is equivalent to projecting the touch points on the touch screen to the X-axis (horizontal) and Y-axis (longitudinal) directions, and then calculati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
Inventor 王文洲
Owner 王文洲
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