Scanning method and device for infrared touch screen

Abstract

The invention discloses a scanning method for an infrared touch screen. The scanning method includes: starting infrared light emitting and receiving diodes of the touch screen to perform scanning at a preset scanning angle during responding to at least one touch control operation of a touch article on the touch screen so as to acquire information of shielded light beams between the infrared light emitting and receiving diodes of the touch screen, wherein the infrared light emitting and receiving diodes includes infrared light emitting diodes and infrared light receiving diodes; calculating candidate touch point zones based on the information of the shielded light beams, wherein the number of angles of the shielded light beams of the candidate touch point zones is greater than a first threshold, and the first threshold is less than a preset number of scanning angles; determining each candidate touch point zone having the number of privately-owned light beams greater than or equal to a second threshold as a true touch point zone, wherein the number of the privately-owned light beams of the each candidate touch point zone is the number of shielded light beams passing the candidate touch point zone.

Description

technical field [0001] The invention relates to the technical field of touch screens, in particular to a scanning method and device for an infrared touch screen. Background technique [0002] Now that the touch screen technology is widely used, the scanning method related to the touch screen is becoming more and more important, and its scanning speed affects the recognition accuracy of the touch point on the touch screen to a great extent. [0003] Usually, infrared emitting tubes and infrared receiving tubes are closely arranged on the frame of the infrared paired tube touch screen, and the touch point is identified by scanning whether the infrared paired tube is blocked. [0004] The smallest touch object that can be recognized by the existing infrared touch screen is generally related to the distance between the lamp tubes (infrared tubes). When the touch screen increases the distance between the light tubes in order to reduce costs, the corresponding product performance...

AI Technical Summary

Problems solved by technology

The occurrence of this problem is related to the algorithm adopted by the existing infrared touch screens. Most of the existing infrared touch screens are based on the results of positive scanning (that is, the signals generated by the transmitting and receiving signals facing each other), and the cutting algorithm is used for coordinate calculation. When the signal is scanned, the position of the touch object cannot be recognized

[0005] Although some touch screens can recognize touch objects that are much smaller than the distance between their own lamp tubes, they need to use image algorithms to perform coordinate calculations. This method leads to a large amount of calculations, and requires the use of ultra-high-performance MCUs or drivers.

This leads to an increase in the final cost of the product

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