Infrared touch screen device and multipoint positioning method thereof

An infrared touch screen, touch screen technology, applied in instruments, electrical digital data processing, input/output process of data processing, etc., can solve the problems of complex logic, poor practical effect, poor practical effect, etc., and achieve simple logic and easy hardware. Accelerated, easy-to-compute effects

Active Publication Date: 2011-05-11
SHANGHAI IRM TOUCH ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are some solutions, such as identifying multiple touch points by detecting the sequence of touch events occurring in combination with tracking algorithms. High recognition rate, poor practical effect
[0005] The Chinese patent with the number CN200710100010.2 discloses a method of using off-axis, that is, oblique-axis scanning, to eliminate false touch points. It uses different methods to process each axis, the logic is complex, and its mathematical model increases with the number of supported points. It becomes complicated and the actual effect is not good

Method used

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  • Infrared touch screen device and multipoint positioning method thereof
  • Infrared touch screen device and multipoint positioning method thereof
  • Infrared touch screen device and multipoint positioning method thereof

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Embodiment Construction

[0044] figure 1 It is a schematic diagram of a transmitting element being received by multiple receiving elements according to a specific embodiment of the present invention. In the figure, 101 is a transmitting circuit board equipped with an infrared emitting element, 102 is a receiving circuit board equipped with an infrared receiving element, 111 is an infrared emitting element installed on the infrared emitting circuit board, 121, 122, 123, 124, 125 are all It is an infrared receiving component installed on an infrared receiving circuit board. 131, 132 have represented the emission range of the infrared emitting element 111, such as figure 1 Shown 111 can be received by 121, 122, 123, 124, 125.

[0045] figure 2It is a schematic diagram of a plurality of transmitting lamps received by the receiving lamp in a specific embodiment of the present invention. Among the figures, 201 is a transmitting circuit board equipped with an infrared emitting element, 202 is a receiving...

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Abstract

The invention discloses an infrared touch screen device and a multipoint positioning method thereof. The method comprises the following steps: using a large-angle infrared emitting and receiving component to realize multi-angle shaft scanning on a touch screen through an optimized sampling and processing circuit; carrying out data processing such as ambient light removing and normalization and the like on shaft-scanning initial data so as to generate logical shaft touch information; generating a brightness map in current frame according to the logical shaft touch information; comparing the generated brightness map with a theoretical touch brightness map so as to identify a plurality of effective touch zones; and finally, outputting multipoint touch events by using an image tracking algorithm. The touch device provided by the invention is simple, reliable, accurate, and wide in application range.

Description

technical field [0001] The invention relates to a touch screen, in particular to an infrared touch screen device capable of distinguishing multiple touch points and operating simultaneously and a multi-point touch positioning method thereof. Background technique [0002] As an interactive device with simple production process and low production cost, infrared touch screen has been developed rapidly. The basic structure of the infrared touch screen is to install several pairs of infrared emitting and infrared receiving elements in a certain order on the four sides of a display surface. These transmitting and infrared 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 the display surface. Under the control of the computer system, each pair of infrared transmitting and receiving elements is connected in a certain order and an infrared receiving element to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/042
CPCG06F3/0421G06F2203/04104
Inventor 赵雷张宇明
Owner SHANGHAI IRM TOUCH ELECTRONICS TECH
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