An infrared touch point recognition method, an infrared touch device and a display device

Abstract

The embodiment of the invention provides an infrared touching point identification method. The infrared touching point identification method includes the steps that in an infrared touching point identification device, the number and the angle of the scanning direction are preset, the number and the position of touching points are determined, and touching areas of the touching points are further determined according to the shielded light path condition of the touching points in the target candidate scanning direction; the current judged touching point is selected as a target candidate touching point, the position relationship between a touching area of the target touching point and the touching areas of other candidate touching points is judged, non-overlapped touching areas that the target candidate touching point is different from other candidate touching points are found out, and the width of the non-overlapped touching areas is further calculated. All the scanning light path directions are traversed, the product of the width of the non-overlapped touching areas and the weight coefficient in the corresponding direction is calculated, and the sum value is calculated; when the sum value is larger than a threshold value, the target candidate touching point is judged as a proper point; otherwise, the target candidate touching point is a cheat point; the steps are repeated, and all real touching points under the condition that multiple points are touched at the same time are further judged.

Description

technical field [0001] The present invention relates to the field of infrared touch technology, in particular to a method for judging real touch points under simultaneous multi-point touch in an infrared touch device, an infrared touch device and a display device. [0002] technical background [0003] A touch screen is an electronic system that can detect the presence and location of a touch point in the display area, which simplifies the method of human-computer interaction; among the target candidate touch technologies, infrared touch technology has strong environmental adaptability and longer life , More identifiable touch points and other advantages are widely used. [0004] The existing infrared touch screen has a rectangular structure and consists of a long emitting side, a long receiving side, a short emitting side and a short receiving side. figure 1 It is a schematic diagram of the forward-scanning optical path of a mid-infrared touch device in the prior art, as sh...

AI Technical Summary

Problems solved by technology

The time-sharing method assumes that multi-point touches occur successively, and only one point is touched at each time, which can effectively distinguish the true point from the false point, but it is difficult to judge the situation of multiple simultaneous touches; the partition method divides the touch into multiple points. In small areas, only one touch point is allowed in each area. This method will reduce the resolution of the touch screen while judging the true and false points, and reduce the user experience; the logic elimination method will logically layer the optical path, and only use a small part of it. Part of the information is used for contact identification, and the rest of the optical path is used to judge the authenticity of the contact, and the multi-point discrimination and accuracy are not high

Therefore, the traditional infrared contact recognition algorithm has problems such as low point recognition accuracy and tricky point recognition accuracy in judging true and false points.

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