An infrared touch device and multi-touch positioning method

Abstract

The invention provides an infrared touch device and a multi-touch location method. The infrared touch device comprises an infrared emission module, an infrared reception module, a control bus, signal processing units, analog to digital (A / D) converters and a microprocessor in an arrayed mode in longitudinal and transverse directions. According to the corresponding emission module and reception module, each infrared emission tube is connected with an infrared emission module control circuit, each infrared reception tube is connected with N infrared reception module control circuits, wherein each infrared emission tube simultaneously corresponds to N (N>=3) infrared reception tubes to form synchronous multi-angle scanning, and the infrared reception module control circuits are respectively connected with one signal processing unit and one A / D converter. The corresponding multi-touch location method is that after the rapid synchronous multi-angle scanning, the collected data is converted through the A / D converters and input into the microprocessor for processing. The accuracy of multi-touch identification of the infrared touch device is improved, and multi-point writing is achieved.

Description

technical field [0001] The invention relates to the field of infrared touch devices, in particular to an infrared touch device capable of distinguishing multiple touch points for simultaneous writing operations and a multi-touch positioning method. Background technique [0002] At present, a touch screen has been widely used in many occasions and fields as an input device replacing or supplementing a common keyboard and mouse. In existing touch screens, the position detection technology for detecting the touch location can be based on different technologies, including infrared, camera, sound wave, etc. [0003] With the development of science and technology, especially the development of computer hardware technology, computers have powerful functions and can be used in almost any field we can imagine, and multi-touch technology is more convenient for users to operate computers, which requires the touch screen to support multiple functions. Point touch operation can detect a...

AI Technical Summary

Problems solved by technology

When there are two non-parallel touch points, the system will calculate two abscissa X values ​​and two ordinate Y values. There are 2X2=4 combinations of abscissa and ordinate, and the two sets of coordinates are the real point positions Coordinates, the other two are virtual point position coordinates, resulting in the position coordinates calculated by the system may not be the real position coordinates, not the actual touch location, resulting in misjudgment

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