Method for recognizing touch screen touch point for laser range finding

Abstract

The invention discloses a method for recognizing touch points of a touch screen based on laser ranging. The method includes: firstly, adopting a working principle of phase type electro-optical distance measurement to obtain transmitting distances from a transmitting apparatus to each receiving input device; and then calculating coordinates of each receiving input device; switching to a normal touch state after storing the coordinates and completing locating; through each receiving input device, obtaining spatial distances from the transmitting apparatus to touch points, and further, to each receiving input device; after calculating the coordinates of the touch points, transmitting the coordinates of the touch points into a computer system to complete the touch point recognizing. The invention overcomes technology problems of the prior infrared touch screens, such as multiple infrared luminous tubes and infrared receiver tubes, low system stability, complex system debugging, high hardware cost, and the like. Furthermore, the invention has advantages of no hardness mechanical limitation between the laser transmitting apparatus and the laser receiving input device, flexible application environment and mounting environment and better application in touch systems with large size touch requirement.

Description

technical field [0001] The invention relates to a method for detecting and identifying a touch point on a touch screen, in particular to a method for recognizing a touch point on a touch screen by laser distance measurement. Background technique [0002] In the infrared touch system, its working method is to install infrared emitting tubes and infrared receiving tubes arranged uniformly in the X and Y directions along the touch area. These infrared emitting tubes and infrared receiving tubes are composed of one-to-one correspondence. The transmitting and receiving pair forms a mutually perpendicular transmitting and receiving array along the edge of the display surface. The control and driving circuit drives the infrared emitting tube and the infrared receiving tube under the control of the MCU execution code, and the corresponding scanning forms a horizontal and vertical crossing pattern in the X direction and the Y direction. Infrared optical network matrix. When an objec...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned problems existing in the identification of multiple touch points in the existing infrared touch screen, and to provide a method for laser ranging to identify touch points on the touch screen. There are many technical problems such as low system stability, complex system debugging, and high hardware cost. There is no rigid mechanical restriction between the laser emitting device and the laser receiving and input device. The application environment and installation environment are flexible, and it is more suitable for large-scale touch requirements. in the touch system

Images