A multi-point positioning method for infrared touch screen

Abstract

The invention discloses a multipoint locating method for an infrared touch screen. The method comprises the steps of numbering infrared light-emitting diodes and infrared light-receiving diodes on all edges; processing infrared light-emitting diode signals received by the infrared light-emitting diodes in sequence according to a number sequence to obtain pits in which the signals are blocked; performing pit registration and touch point center rough locating by utilizing infrared light-receiving diode signals on the single edges; performing touch point center fine locating in combination with a roughly located touch point center by utilizing infrared light-receiving diode signal pits of the adjacent edges of the single edges; and performing calculation by integrating touch point center fine locating results of all the single edges to obtain a final coordinate position of a touch point. Information obtained on the receiving diodes is effectively integrated; the touch point identification accuracy and the locating precision are both relatively high; the calculation complexity is low; the memory occupation size is small; the method is especially fit for single chip microcomputer realization; and the method is suitable for not only a conventional structure of which a ratio of emitting diodes to receiving diodes is 1, but also a structure of which the ratio of emitting diodes to receiving diodes is greater than 1, so that the range of application to the structure is wide.

Description

technical field [0001] The invention relates to the technical field of infrared touch screens, in particular to a multi-point positioning method for infrared touch screens. Background technique [0002] At present, as a humanized input device, the touch screen has broad development prospects. With the rapid development of the computer touch screen industry, the infrared touch screen has been widely used in various fields due to its simple production process, low production cost, convenient installation, maintenance-free, high explosion resistance, and high reliability. The basic structure of the infrared touch screen is to install several pairs of infrared emitting and infrared receiving elements in a certain order around the edge of a display surface suitable for installation. These transmitting and receiving elements form a transmitting and receiving pair in a one-to-one correspondence, and form a mutually perpendicular transmitting and receiving array along the edge of t...

AI Technical Summary

Problems solved by technology

However, because the structure of the infrared receiving tube is more complicated than that of the transmitting tube, the infrared receiving tube is more expensive than the transmitting tube, and because the infrared signal is weak, especially when the touch screen is larger, the signal on the infrared receiving tube is even weaker, so it is necessary to use More complex signal processing circuit to process the signal generated on the infrared receiving tube, so the cost is undoubtedly higher

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