Method and system for multi-touch recognition based on infrared touch screen

Abstract

The invention discloses a method and system for multi-point touch control identification based on an infrared touch screen. The system comprises the touch screen, two sets of infrared emitting tubes and two sets of infrared receiving tubes, wherein the two sets of infrared emitting tubes and the two sets of infrared receiving tubes are sequentially arranged in the X direction on the periphery of the touch screen and in the Y direction on the periphery of the touch screen. Each infrared emitting tube emits at least two beams of infrared light rays to one infrared receiving tube arranged oppositely. The surface of the touch screen is scanned sequentially by the two sets of infrared tubes arranged densely in pairs in the X direction and the Y direction so that mutually perpendicular infrared raster scanning nets and mutually intersected infrared raster scanning nets can be formed. Whether the infrared light rays are blocked in the X direction and the Y direction or not is judged, if the answer is positive, blocking coordinates are located, and the position of a touch point is identified. According to the method and system for multi-point touch control identification based on the infrared touch screen, the phenomena of wire breakage, wire jumpers and the like are reduced, the position coordinates are located accurately, and user experience degree is increased.

Description

Technical field [0001] The invention relates to the technical field of touch screens, in particular to a method and system based on infrared touch screen multi-touch recognition. Background technique [0002] In the patent application with publication number CN101901086A, a multi-touch recognition method for infrared touch screens is proposed, but the current multi-touch recognition methods are based on two sets of densely arranged infrared pairs in the X and Y directions on the screen. It indicates that the infrared raster scanning nets that are perpendicular to each other are scanned sequentially to determine whether there is infrared blocking in the X and Y directions. If there is blocking, locate the coordinates of the blocking point. However, with this method of identification, infrared touch screens rely on multiple pairs of infrared emitting and receiving tubes. The performance and life of the infrared tubes are relatively reliable. Any object that blocks light can be used...

AI Technical Summary

Problems solved by technology

However, in this identification method, the infrared touch screen works by multiple pairs of infrared emitting and receiving tubes. The performance and life of the infrared tubes are relatively reliable. Any object that blocks light can be used as a touch object, but the number of sensors used by the infrared touch screen is how many There are hundreds of pairs, it is difficult to guarantee the consistency or damage of each tube after working for a long time, so many touch screens will have problems such as insensitivity or disconnection due to the aging of the luminous tube after working for a period of time Early infrared touch screens were mostly used for clicking, and there were many small-size applications. However, with the increasing size and lower price of flat-panel display technologies such as LCD and PDP, there are more and more large-size applications. Large-scale touch applications require more writing. Traditional touch screens have a low response speed, and the amount of coordinate data is often 60 points per second, resulting in serious deformation of the writing track.

Since the infrared touch screen needs a stable structure to ensure that all the infrared tubes are on the same level, it cannot accurately locate the position coordinates located in the grid, and there is a certain error rate, which results in the tactile sensitivity of the infrared touch screen, resulting in relatively high poor user experience

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