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Method for identifying multiple true touch point by infrared touch screen

An infrared touch screen and real touch technology, applied in the input/output process of data processing, instruments, electrical digital data processing, etc., can solve the problems of multi-point identification blind spots, small emission angles, low resolution, etc., and achieve improved infrared scanning Increased speed, responsiveness, and improved accuracy

Active Publication Date: 2009-07-29
GENERALTOUCH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the above two methods can achieve multi-touch to a certain extent, and the first one also solves the problem of slow response speed of the infrared multi-touch screen from the hardware circuit and algorithm to a certain extent, but there are the following two aspects: Disadvantages: 1. There are multi-point recognition blind spots in some areas
In some areas of the 4 corners, the Y=X[sinα*sin(α+β)] / sinβ described above cannot be formed, and multi-touch in this area cannot be effectively recognized.
2. Lower resolution
Since the emission tube is limited by the emission power, its emission angle is generally small (<20°), and the resolution of the oblique direction is 0.36 times that of the horizontal direction (tg20°=0.36), so the resolution of the oblique direction is greatly reduced, which is not conducive to Correct identification of nearby multiple points

Method used

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  • Method for identifying multiple true touch point by infrared touch screen
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  • Method for identifying multiple true touch point by infrared touch screen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A method for identifying a plurality of real touch points on an infrared touch screen, comprising the steps of: a, setting a Z-axis infrared scanning component on an X-axis infrared scanning component and a Y-axis infrared scanning component of the infrared touch screen; b, starting the infrared touch screen, driving The infrared emitting unit and the infrared receiving unit of the X-axis, Y-axis and Z-axis infrared scanning components perform infrared scanning on the X-axis, Y-axis and Z-axis directions, the infrared emitting unit sends the touch signal to the infrared receiving unit, and the infrared receiving unit Perform touch analysis on the received touch signal to generate touch position information on the X-axis, Y-axis and Z-axis; c. The controller judges whether the generated touch position information is valid touch position information. If there is no valid touch position information, return to initialization. When valid touch position information, the contro...

Embodiment 2

[0067] A method for identifying a plurality of real touch points on an infrared touch screen, comprising the steps of: a, setting a Z-axis infrared scanning component on an X-axis infrared scanning component and a Y-axis infrared scanning component of the infrared touch screen; b, starting the infrared touch screen, driving The infrared emitting unit and the infrared receiving unit of the X-axis, Y-axis and Z-axis infrared scanning components perform infrared scanning on the X-axis, Y-axis and Z-axis directions, the infrared emitting unit sends the touch signal to the infrared receiving unit, and the infrared receiving unit Perform touch analysis on the received touch signal to generate touch position information on the X-axis, Y-axis and Z-axis; c. The controller judges whether the generated touch position information is valid touch position information. If there is no valid touch position information, return to initialization. When valid touch position information, the contro...

Embodiment 3

[0072] The best implementation mode of the present invention is α=45°, and the following takes the two-point touch of α=45° as an example to expand the description:

[0073] The present invention includes infrared scanning components in three directions of X / Y / Z, and one touch point A will generate three coordinate values ​​of Xa, Ya and Za. Since the included angle between the Z axis and the X / Y axis is 45 degrees, Xa, Ya, and Za satisfy the relationship of Za=Xa+Ya. If it is a two-point touch, six coordinate values ​​Xa, Ya, Za, Xb, Yb, and Zb will be generated, and the following eight coordinate combinations may be formed:

[0074] A: (Xa, Ya, Za)

[0075] B: (Xa, Yb, Za)

[0076] C: (Xb, Ya, Za)

[0077] D: (Xb, Yb, Za)

[0078] E: (Xa, Ya, Zb)

[0079] F: (Xa, Yb, Zb)

[0080] G: (Xb, Ya, Zb)

[0081] H: (Xb, Yb, Zb)

[0082] Substitute the coordinates of the above eight points into the conditional relational formula: X+Y=Z, only A and H meet the conditions, so th...

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Abstract

The invention discloses a method for identifying a plurality of authentic touch points by using an infrared touch screen. Firstly, the infrared scanning is carried out in the directions of X, Y and Z axes; a scanning unit carries out the touch analysis for touch signals to generate the touch position information of the X, Y and Z axes; a controller is adopted to judge whether the touch position information belongs to the effective information; when the effective touch position information exists, the controller collects the information and arranges and combines the collected data to generate combination points; the controller respectively judges all of the combination points according to that X plus Y*tg(90 minus Alpha) equals Z, to see whether the combination point meeting the condition exists, wherein, Alpha is an included angle between the Z axis scanning unit and the X axis scanning unit; the obtained position information of each authentic touch point is transmitted to a computer system. The invention can fully cover the whole touch zone and the multi-point identification blind zone can be avoided in the whole touch zone so as to completely exclude false points and authentically realize the correct identification of a plurality of touch points.

Description

technical field [0001] The invention relates to an infrared touch screen, in particular to a method for identifying multiple real touch points on the infrared touch screen. 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. The basic structure of the infrared touch screen is to install several pairs of infrared emitting and infrared receiving elements in a certain order around the edge of a display surface suitable for installation. The angular displacement β of the infrared emitting tube and the receiving tube is generally less than or equal to ± ± when the relative radiation intensity is 0.5 times 15 degrees, these transmitting and infrared receiving elements form a transmitting and receiving pair in a one-to-one correspondence, forming a mutually perpendicular transmitting and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/042H03K17/795
Inventor 蒲彩林
Owner GENERALTOUCH TECH
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