Method for recognizing touch screen touch point for laser range finding

A technology of laser distance measurement and touch point, which is applied in the input/output process of data processing, instruments, electrical digital data processing, etc., can solve the problems of low system stability, high hardware cost, and complicated system debugging, and achieve the goal of installation Flexible environment, long service life, saving manpower and cost
CN101339476AActive Publication Date: 2009-01-07GENERALTOUCH TECH
1 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GENERALTOUCH TECH
Publication Date
2009-01-07

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More