Method for recognizing multiple touch points on infrared touch screen

An infrared touch screen and touch point technology, which is applied in the touch point detection of computer touch screen and the field of microprocessor control, can solve the problems that infrared touch screen cannot be applied, and achieve the effect of extremely low application cost and wide applicability

Inactive Publication Date: 2008-12-10
BEIJING UNITOP NEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current infrared touch screen cannot detect multiple touch points. In other types of touch screens, there are only several technical solutions such as Chinese patents with application numbers 02822048.X and 200580011740.4 and US patent applications with application numbers US20050257924.
But none of these technical solutions can be applied to infrared touch screens

Method used

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  • Method for recognizing multiple touch points on infrared touch screen
  • Method for recognizing multiple touch points on infrared touch screen
  • Method for recognizing multiple touch points on infrared touch screen

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Embodiment Construction

[0019] specific implementation plan

[0020] figure 1 In essence, the basic installation structure of the infrared touch screen present in the general structure is given, which is also the basic installation structure of the infrared touch screen to which the method of the present invention is applicable. As shown in the figure, the touch screen is a rectangular touch screen composed of an infrared emitting tube array 102 and an infrared receiving tube array 103 installed around a touch detection area (generally a display area such as a computer monitor or a projector screen) 101, wherein the infrared emitting One-to-one correspondence with the receiving tube constitutes a pair of infrared emitting and receiving tubes. Assuming that there are two touch objects (solid line circles in the figure) 106 and 109 in the scanning detection area of ​​the touch screen with this structure, which are represented by characters B and D respectively, then when the infrared emitting and rece...

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Abstract

A method can identify a plurality of touch points on an infrared touch screen. The method is applied to the infrared touch screen. An infrared emission tube array and an infrared receiving tube array are arranged around the infrared touch screen along a touch area. If the method detects that the optical line of more than one pair of emitter-receiver tube is blocked on the touch screen in latitudinal direction or longitudinal direction, the serial number or the address of the pair of emitter-receiver tube that is blocked is stored. Detected coordinate figures in the latitudinal and longitudinal directions are combined to obtain a plurality of possible touch points. And then, the pseudo touch points are picked off by the means of off-axis scanning. The method only changes the execution code of a micro controller to achieve the purpose of detecting a plurality of touch points without changing any structure of the current infrared touch screen, so the method has the advantages of very low application cost and extremely wide applicability.

Description

technical field [0001] The invention relates to a method for detecting touch points on an infrared touch screen, which belongs to the technical field of microprocessor control, in particular to the technical field of touch point detection for computer touch screens. Background technique [0002] As a branch of computer touch screen, infrared touch screen is gradually widely used in various fields due to its advantages of convenient installation, maintenance-free, high explosion resistance, and high reliability. Although through more than 20 years of development, there are numerous technical improvements, such as the content announced by Chinese patents such as 95105303.5, 00121462.4, or applications. However, the current basic technical solutions of infrared touch screens are still limited to the technical contents disclosed in US Patent Nos. 3,764,813, 3,775,560, and 3,860,754. However, these technical contents are far from the technical level that the infrared touch scree...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/042
Inventor 刘建军叶新林刘新斌
Owner BEIJING UNITOP NEW TECH CO LTD
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