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Analysis of the method of judging true and false two-point infrared touch all-in-one machine

Source: KONWHAI TOUCHAuthor: KONWHAI Date: 2020-10-07 Click:

  •      The infrared touch all-in-one machine is composed of an infrared touch screen, a liquid crystal display, and a computer host. The all-in-one touch machine is a touch product that bundles the touch screen and related software together with an outer package for query purposes. The touch all-in-one machine truly integrates touch and control, and greatly improves people's work efficiency.
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  •      The infrared touch screen used in the touch all-in-one machine uses the infrared matrix densely distributed in the X and Y directions to detect and locate the user's touch. Users only need to touch the screen of the machine lightly with their fingers to quickly get the information they want, which makes the human-computer interaction more straightforward.
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  •      So, is the touch screen of the infrared touch all-in-one machine a true two-point touch screen? How should it be judged? The technical staff of KONWHAI touch all-in-one machine manufacturer will analyze and answer for you.
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  • Analysis of the method of judging true and false two-point infrared touch all-in-one machine

  •  Analysis of the method of judging true and false two-point infrared touch all-in-one:  
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  • 1. Principle of infrared touch screen
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  •      Install an outer frame in front of the display screen. There is a circuit board in the outer frame. There are evenly arranged infrared emitting tubes and infrared receiving tubes in the X and Y directions. Scanning by the emitting/receiving devices in the opposite and oblique directions For many modes, a cross-straight infrared array is formed. When the user is touching the screen, the touching object (finger or other objects) will block the cross infrared rays passing through the position, and the controller can obtain the true multi-point coordinate position through calculation.
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  •      The fake 2-point touch screen usually only correctly recognizes one point, but when two touch objects are placed, the system actually gets the data of 4 points, namely XA, XB, YA, YB, and the coordinates of these four points can be combined in pairs. Get 4 coordinate points, namely A (XA, YA), B (XB, YB), C (XA, YB), D (XB, YA). When the touch points are two points A and B, the fake two-point touch screen cannot determine whether the touch position is A, B or C, D. However, when the two touch points A and B are close to or separated from each other, the distance between the corresponding pseudo points C and D is also close to or separated from each other. By calculating the relative position, the pseudo two-point touch screen can detect two gestures of zooming in and zooming out.
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  •      However, false two-point touch screens are more prone to misoperation when judging rotation gestures. Generally, when a rotation gesture is required for 2 points, one of the points is fixed, and the other moves clockwise or counterclockwise from the upper right of the fixed point, or requires the touch points to fall separately, so that the system can touch the points separately through the time difference Real location. However, when the 2 touch points of the fake 2-point touch screen (such as: A and B) are in the horizontal or vertical position, the position of ghost points (such as: C and D) will change, so the rotation action is prone to errors. The specific performance is that the direction of finger movement has not changed, but the object is manipulated.
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  • 2. The difference in touch effect
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  •      In terms of picture rotation: true 2 points are rotated by 2 different touch points on the touch screen, and the picture rotation direction is the same as the touch rotation direction, and there is no error rate; false 2 points are made by 2 different touches on the touch screen Click to rotate the picture, the picture rotation direction is opposite to the touch rotation direction, the error rate of the same rotation direction can reach 40%-80%.
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  •      In terms of writing: True 2 points can always maintain an accurate response to touching fingers. When both hands are drawn at the same time, the error rate of broken lines and jumpers is almost equal to zero; false 2 points have 20%-80 on both hands writing at the same time % Error rate. For example, if both hands draw lines at the same time, the lines will be broken or jumped.
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