Method for realizing multi-point real touch on surface acoustic wave touch screen

Abstract

The invention discloses a method for realizing multi-point real touch on a surface acoustic wave touch screen. The method comprises the following steps that (1), a group of transmitting transducer arrays or receiving transducer arrays are at least arranged on the X axis or the Y axis; (2), a transmitting circuit drives transmitting transducers to transmit a surface acoustic wave signal, and a receiving circuit controls receiving transducers to receive the surface acoustic wave signal; (3), when a touch body touches the surface acoustic wave touch screen, the surface acoustic wave signal reaches the receiving transducers after being reflected by the touch body; when the surface acoustic wave signal intensity is greater than a set threshold value, the receiving circuit sends the surface acoustic wave signal to an MCU (microprocessor control unit), and the MCU determines the coordinates of the touch body. By the method, the multi-point real touch response of two or more points is realized, ghost points are eliminated fundamentally, and moreover, the touch response of unlimited points in a touch area can be really realized by the conventional process.

Description

technical field [0001] The invention relates to a surface acoustic wave touch screen, in particular to a method for realizing multi-point real touch on the surface acoustic wave touch screen. Background technique [0002] The current touch screens mainly include surface acoustic wave, infrared, and capacitive types. Among them, the surface acoustic wave touch screen has become the most popular among several mainstream touch screens due to its advantages such as high resolution, short response time, strong environmental adaptability, good stability, and good light transmission. A touch screen with promotional value. [0003] The existing ordinary surface acoustic wave touch screen only has two physical positioning axes perpendicular to each other, the X axis and the Y axis. Based on the principle of axis intersection, a touch point can be accurately identified and a unique set of position coordinate data can be obtained. However, for two or more When the touch points are ope...

AI Technical Summary

Problems solved by technology

[0010] The patent adds a Z-axis that can assist in screening ghost points. After adding the Z-axis, a maximum of two physical touch objects can be recognized at the same time, and a set of U-axis perpendicular to the Z-axis can be added, and a maximum of three physical touch objects can be recognized at the same time. , so theoretically there are N groups of coordinate axes, and N-1 physical touch objects can be identified at the same time, but increasing the number of coordinate axis groups also requires adding corresponding reflection stripe arrays around the touch screen body, and the surface acoustic wave signal passes through multiple groups of reflection stripes A lot of messy signals are generated behind the array, and the transducers are easy to be received, which seriously affects the firmware system’s recognition of coordinate points. At the same time, adding multiple sets of reflective stripe arrays requires a wider touch screen around the body to meet the spatial layout requirements of the reflective stripe array. It runs counter to the current market demand for light weight, narrower, borderless and flat touch screens, and the existing processing technology cannot produce surface acoustic wave touch screens with N sets of coordinate axes

Images