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Method for discriminating multiple 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 microprocessor control field, can solve the problems that infrared touch screen cannot be applied, and achieve the effect of extremely low application cost, easy detection and low application cost

Active Publication Date: 2007-11-21
BEIJING IRTOUCH SYST CO LTD
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  • Abstract
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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 discriminating multiple points on infrared touch screen

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Embodiment Construction

[0017] specific implementation plan

[0018] FIG. 1 essentially shows the basic installation structure of an infrared touch screen with a general structure, and is also the basic installation structure of an 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 . The infrared emitting and receiving tubes therein can be the same as the infrared touch screen with the existing structure and have the same number, and form a pair of infrared emitting and receiving tubes in one-to-one correspondence; the numbers of the emitting tubes and the receiving tubes can also be set to be different. However, for the purpose of uniform resolution, it is best to use an equal number of paired ...

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Abstract

A method for identifying multiple touch-point on infrared touch screen includes using light cut off by touch object between emitting and receiving tubes of co-axis and off-axis to confirm approximate coordinate value of touch point at one direction and preliminarily rejecting out pseudo-touch point and then using the same means to do the same thing on another direction for finally obtaining accurate coordinate value of all touch points and simultaneously rejecting out all pseudo-touch points.

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
CPCG06F3/04883G06F3/0421G06F2203/04808
Inventor 刘建军叶新林刘新斌
Owner BEIJING IRTOUCH SYST CO LTD
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