Method for two-point control gesture recognition of four-wire resistance touch screen

Abstract

The invention discloses a method for two-point control gesture recognition of a four-wire resistance touch screen. The touch screen is provided with an X-axis and a Y-axis. The method comprises the following steps that a, a single-point touch voltage resolution threshold and a two-point touch voltage resolution threshold are measured; b, touch detection is carried out, if touch motion exists, the step c of touch recognition is carried out, otherwise, the step b is executed in a looping mode; c, a measured and marked voltage value is compared with the voltage resolution thresholds in the step a, and whether the touch motion is single-point touch or two-point touch is judged; d, two-point touch gesture recognition and single-point touch coordinate positioning are carried out. According to the method, because voltages are applied to the four-wire resistance touch screen, the change tendency of the voltages is measured to judge single-point touch and two-point touch, and two-point touch gesture recognition is carried out, hardware cost is not increased, less software resources can be consumed, recognition precision and accuracy can be improved, the using diversity of the four-wire resistance touch screen is expanded, and the four-wire resistance touch screen has very good popularization and using value.

Description

technical field [0001] The invention relates to a method for recognizing two-point touch gestures on a four-wire resistive touch screen. Background technique [0002] With the development of electronic technology and people's higher and higher requirements for the portability of equipment, the application range of touch screens has become more and more extensive, from industrial equipment, instrumentation control to commercial ATM cash machines, From POS terminals, to mobile phones and tablet PCs of consumer electronics, there are touch screens everywhere. [0003] Currently, mainstream touch screens are resistive touch screens and capacitive touch screens. [0004] The working principle of the resistive touch screen is to realize the recognition of the touch through the principle of pressure sensing and resistive voltage division. Two conductive layers are formed. When an object touches the screen, the normally insulated two conductive layers are in contact at the touched...

AI Technical Summary

Problems solved by technology

[0006] Since the capacitive screen supports multi-touch, it greatly improves the human-computer interaction experience and has been recognized by users. However, the production cost is high, it is susceptible to electromagnetic and temperature interference, it is prone to drift, the stability is poor, and it only supports fingers. The touch recognition of such conductors hinders the expansion of the application field of capacitive screen to a certain extent. It is generally used in the field of consumer electronics, and rarely involved in other fields such as industrial control.

[0007] Although ordinary resistive screens are simple to use, low in cost, and support multiple input media (conductors and non-conductors), traditional resistive screen detection technology can only support single-touch recognition, and multi-touch resistive voltage division is very complicated. The change rate of the distance between touch points is nonlinear, so that there is no uniform law between the contact position and the output voltage, so it is impossible to determine the multi-touch

[0008] Although the scanning matrix resistive screen can realize multi-point touch recognition through row and column scanning, the circuit of the screen itself is complicated, which increases the production cost.

There are also some solutions that use ordinary resistive screens to realize two-point touch recognition, but a prerequisite for these solutions is that there is a certain time difference between the two-point touch actions, and the processing speed of the controller must be fast enough to detect One point is touched, and then another point is detected, and the software needs to perform complex calculations to obtain the coordinates of the midpoint of the two touch points in order to realize the recognition of the two touch points, which increases the complexity of the software and the calculation workload. Stability and accuracy are also to be verified

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