Multi-touch positioning method and multi-touch screen

A multi-touch positioning method, comprising:

• emitting, by a first infrared ray generator set at a first angle of a display panel, infrared rays at a first wavelength, and emitting, by a second infrared ray generator set at a second angle, infrared rays at a second wavelength;
• receiving the infrared rays of the first wavelength and generating a first infrared ray image by a first infrared ray image sensor set at an opposite angle of the first angle, and receiving the infrared rays of the second wavelength and generating a second infrared ray image by a second infrared ray image sensor set at an opposite angle of the second angle;
• and
• performing touch point position processings for the first infrared ray image and the second infrared ray image to determine at least one touch point, comprising:
• performing image correction processing for the first infrared ray image and the second infrared ray image;
• performing analog to digital conversion for the first infrared ray image and the second infrared ray image subjected to the image correction processing, to generate a first digital image and a second digital image;
• performing discrimination processing for the first digital image and the second digital image, to obtain a first projection position in the first digital image of the touch point and a second projection position in the second digital image of the touch point;
• determining a position of the touch point according to the first projection position and the second projection position, wherein
• when the first angle and the second angle are adjacent angles, following processings are performed:
• generating a first marking position on a second diagonal according to the first projection position, and generating a second marking position on a first diagonal according to the second projection position, wherein the first diagonal is a connecting line between a vertex of the first angle and a vertex of the opposite angle of the first angle, and the second diagonal is a connecting line between a vertex of the second angle and a vertex of the opposite angle of the second angle;
• generating a first linear function according to a position of the vertex of the opposite angle of the first angle and the first marking position, and generating a second linear function according to a position of the vertex of the opposite angle of the second angle and the second marking position;
• and
• obtaining coordinates of the touch point according to the first linear function and the second linear function;
• and wherein
• when the first angle and the second angle are opposite angles, following processings are performed:
• generating a first marking position on a second diagonal according to the first projection position, and generating a second marking position on the second diagonal according to the second projection position, wherein the second diagonal is a connecting line between vertexes of two adjacent angles of the first angle;
• generating a first linear function according to a position of the vertex of the opposite angle of the first angle and the first marking position, and generating a second linear function according to a position of the vertex of the opposite angle of the second angle and the second marking position;
• and
• obtaining coordinates of the touch point according to the first linear function and the second linear function.