Touch point positioning method for self capacitance touch screen

A self-capacitance, positioning method technology, applied in electrical digital data processing, data processing input/output process, instruments, etc., can solve electronic signal noise interference, material differences, affect the stability and control performance of the touch screen sensing system, etc. problem, to achieve the effect of improving accuracy, low calculation amount, and high positioning efficiency

Inactive Publication Date: 2015-06-03
GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of capacitive touch screen sensing, there are various electronic signal noise interferences and material differences, which will seriously affect the stability and control performance of the touch screen sensing system.

Method used

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  • Touch point positioning method for self capacitance touch screen
  • Touch point positioning method for self capacitance touch screen
  • Touch point positioning method for self capacitance touch screen

Examples

Experimental program
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Effect test

no. 1 example

[0080] A method for positioning touch points of a self-capacitive touch screen, referring to figure 2 , the self-capacitive touch screen includes an insulating substrate, a plurality of X-channel electrodes distributed on one side of the insulating substrate, and a plurality of Y-channel electrodes distributed on the other side of the insulating substrate, the distance between the X-channel electrodes and the distance between the Y-channel electrodes The spacing is equal; multiple X-channel electrodes and multiple Y-channel electrodes are connected to the control center through leads, and the control center calculates and outputs touch coordinate points after measuring the capacitance change value of each electrode channel at different times by implementing the touch point positioning method. In this embodiment, the shape of the X-channel electrodes and the Y-channel electrodes is preferably strip-shaped, but actually the shapes of the X-channel electrodes and the Y-channel el...

no. 2 example

[0116] This embodiment uses MATLAB to carry out the simulation experiment on the first embodiment, assuming that the total number of X-channel electrodes is 27, and the total number of Y-channel electrodes is 18, assuming that the real touch point is P=(7, 11.5), where x=7 It means that the real touch point is just on the 7th channel electrode in the direction, and y=11.5 means that the real touch point is in the middle of the 11th channel electrode and the 12th channel electrode in the Y direction. Continuously collect 100 frames of data, respectively use the non-partition method, the partition non-grading method and the classification method proposed by the present invention to calculate the touch point coordinates respectively, and the calculated coordinate points in the X and Y directions are as follows: Figure 7 and Figure 8 Shown, wherein the weighting coefficient ρ of the present invention in the experiment 1 = 0.8, ρ 2 = 0.2. The variance of the average value of t...

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Abstract

The invention discloses a touch point positioning method for a self capacitance touch screen. The method comprises the following steps that S1, reference capacitance values and touch thresholds of each x channel electrode and Y channel electrode are initialized and updated; S2, the real-time capacitance value of each channel electrode of the self capacitance touch screen is detected, whether the touch occurs or not is judged, if the touch occurs, the step S3 is continuously executed, and otherwise, the current step is continuously executed; S3, a touch region is determined through being combined with the real-time capacitance value of each channel electrode; S4, a grading weighing algorithm is adopted for calculating the touch coordinate value of the touch region, so that a touch point is determined; S5, the reference capacitance value is updated on the channel electrode which is not touched. The method has the advantages that the isolated noise point interference near the touch point can be filtered away, the touch point calculation and positioning accuracy is improved, the stability is higher, in addition, the calculation quantity is low, the positioning efficiency is high, and the method can be widely applied to the application field of the self capacitance touch screen.

Description

technical field [0001] The invention relates to the field of touch screens, in particular to a touch point positioning method of a self-capacitive touch screen. Background technique [0002] The touch screen has the characteristics of low mechanical loss and small volume, and has been widely used in various electronic products. The essence of touch screens is sensing technology, and touch screens are usually divided into four categories according to the types of sensors: capacitive touch screens, resistive touch screens, infrared touch screens, and surface acoustic wave touch screens. Surface acoustic wave touch screens and infrared touch screens are made of frames or transparent glass, with high light transmittance, clear and not easy to be damaged, but the appearance is not as good as the film type due to the space occupied on the display screen. In addition, if there are water droplets or dust on the surface of the surface acoustic wave touch screen, it will become dull....

Claims

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Application Information

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IPC IPC(8): G06F3/044
Inventor 张欢王文韬彭海炎任灿钱小立王慰李建军
Owner GUANGZHOU INST OF ADVANCED TECH CHINESE ACAD OF SCI
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