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Method and device for detecting touch screen

A touch screen detection, touch screen technology, applied in the direction of instrument, electrical digital data processing, data processing input/output process, etc., can solve the problem of inability to recognize multi-touch and other problems, achieve high resolution, cost realization, fast response speed Effect

Inactive Publication Date: 2010-02-10
VIMICRO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a touch screen detection method and device to solve the problem that the current surface acoustic wave touch screen cannot recognize multi-touch

Method used

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  • Method and device for detecting touch screen
  • Method and device for detecting touch screen

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Embodiment 1

[0045] refer to figure 2 , is a flowchart of a touch screen detection method according to Embodiment 1 of the present invention. In this embodiment, the detection of a touch point is taken as an example for description.

[0046] Step 201, select at least three coordinate points on the touch screen;

[0047] As mentioned above, at least three non-collinear points are required as the center of the circle, and the following will take three coordinate points as an example for illustration. In this embodiment, preferably, the three corners of the touch screen are used as the coordinate points of the center of the circle, and three acoustic wave receivers are placed at the coordinate points for receiving the acoustic wave signals generated by the contacts. For details, please refer to image 3 As shown, in the figure, S1, S2, and S3 are three acoustic wave receivers, c1, c2, and c3 are the positions (that is, coordinate points) for placing the three acoustic wave receivers, and r1...

Embodiment 2

[0067] In the case of multi-touch, the same sound wave receiver will receive multiple sound wave signals, so multiple concentric circles will be constructed with the same sound wave receiver as the center, so how to solve the common intersection of three circles Choose three circles to form a system of equations, this system of equations can be satisfied with a common point of intersection? That is, how to choose the circle equation constructed for the same touch point?

[0068] The solution of this embodiment is:

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Abstract

The invention provides a method and a device for detecting a touch screen to solve the problem that the current surface acoustic wave touch screens can not identify multitouch. The method comprises the following steps: selecting at least three coordinate points on the touch screen, computing the distance between a touch point and each coordinate point by utilizing the acoustic wave signal generated on the touch screen by the touch point, constructing at least three circles by taking the coordinate points as the centers of the circles and the distances between the touch point and the coordinatepoints as the radii and determining the position of the touch point on the touch screen by solving the coordinate value of a common intersection point, wherein, the common intersection point of the circles is the touch point. The invention further reduces the power consumption and cost and realizes multitouch while maintaining the advantages of the surface acoustic wave touch screens, including high light transmittance, high resolution, rapid response speed, good wear resistance and long life, etc.

Description

technical field [0001] The invention relates to the technical field of touch recognition, in particular to a touch screen detection method and device. Background technique [0002] Touch screen technology is a major input method for human-computer interaction in the future. The touch screen is composed of a touch detection part and a touch screen controller; the touch detection part is installed in front of the display screen to detect the user's touch position, and transmits the touch information to the touch screen controller after receiving the touch information; the main function of the touch screen controller is to obtain information from the touch detection part Receive touch information, convert it into contact coordinates, and then send it to the CPU. It can also receive and execute commands from the CPU. [0003] According to the working principle of the touch screen and the medium for transmitting information, the touch screen is mainly divided into: a resistive t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/043
CPCG06F3/043G06F3/0416G06F3/04166
Inventor 黄斌
Owner VIMICRO CORP
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