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A method and device for determining a touch point on an infrared touch screen

A technology of infrared touch screen and determination method, which is applied in the direction of instruments, calculations, electrical digital data processing, etc., can solve the problems of only identifying two points, increased cost, and slow scanning speed, so as to improve the analysis and calculation speed and obtain fast speed , the effect of reducing the amount of data

Active Publication Date: 2022-03-15
BEIJING IRTOUCH SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are also methods to eliminate "ghost points" by adding a second set of hardware or using a large-angle oblique scan on the basis of identifying the position, but there are some problems such as greatly increased cost, high thickness of the touch screen, and the need for infrared detection components. (Such as infrared emission tubes, infrared receiving tubes) have high performance requirements and slow scanning speed or can only identify two points, etc.

Method used

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  • A method and device for determining a touch point on an infrared touch screen
  • A method and device for determining a touch point on an infrared touch screen
  • A method and device for determining a touch point on an infrared touch screen

Examples

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Embodiment 1

[0085] According to an embodiment of the present invention, an embodiment of a method for determining a touch point on an infrared touch screen is provided. It should be noted that the steps shown in the flow chart of the accompanying drawings can be implemented in a computer system such as a set of computer-executable instructions and, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

[0086] It should be noted that the method of the present invention is applied to an array of infrared emitting tubes and infrared receiving tubes arranged around the touch area, connecting the auxiliary circuits of the infrared emitting tubes and infrared receiving tubes, controlling the circuits and storing, In the infrared touch screen composed of a microcontroller system that calculates and transmits the detected data.

[0087] Such as figure 1 As shown, the infrared to...

Embodiment 2

[0151] Such as Figure 9 As shown, the present invention also provides a device for determining a touch point on an infrared touch screen. The infrared touch screen composed of the auxiliary circuit and the microcontroller system that controls the circuit and stores, calculates and transmits the detected data also includes:

[0152] The first drawing module 10 is used to draw the background line light path diagram according to the position coordinates of each infrared emitting tube;

[0153] The second drawing module 20 is used to draw the light path diagram of the scanning line when there is a touch point;

[0154] The undetermined touch area determination module 30 is used to compare the light path diagram of the scanning line with the light path diagram of the background line to determine the blocked light; judge whether the blocked light belongs to the main axis; if so: the light to be blocked The horizontal axis intersects the vertical axis, and the undetermined touch a...

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Abstract

The invention discloses a method and device for determining a touch point on an infrared touch screen. The invention uses the intersection of a horizontal and a vertical axis as a preliminary judgment condition, and can quickly lock a candidate touch point and position. The scanning lines that must not intersect with the undetermined touch area are screened out by using the fast repulsion experiment, and only the intersecting scanning lines are analyzed, so that the amount of processed data is greatly reduced, and the speed of analysis and operation is improved. For the intersecting scanning lines, instead of considering all the lines locally, the parallelogram formed by the boundary line with the largest slope and the upper and lower positions intersects the rectangle of the undetermined touch position on the whole, and finally determines the intersection, and then judges the final touch point, the time complexity is small, and the efficiency is high.

Description

technical field [0001] The invention relates to an infrared touch screen, in particular to a method and device for determining a touch point of an infrared touch screen. Background technique [0002] For a long time, the traditional multi-point recognition method of infrared touch screen mainly adopts logic elimination method, including partition method and time-sharing method. The operation of two touch points will generate the corresponding "Ghost" point, which is usually called "ghost point" or ghost point in China, and the real second touch point is diagonal to the first touch point, so through the time-sharing method The "ghost point" can be eliminated, and the partition method requires the entire touch screen to be physically divided into several areas. Each touch screen may have 2, 3, or 4 areas, and each area is positioned for a single touch operation to eliminate touch. The "ghost point" generated when the point moves, and the real point can be distinguished from t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/041G06F3/042
CPCG06F3/0416G06F3/0421
Inventor 程海新
Owner BEIJING IRTOUCH SYST CO LTD
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