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        What are the classifications of multi-touch screens?


        What are the classifications of multi-touch screens? The projected capacitive touch screen is still based on capacitive sensing, but compared to the surface capacitive touch screen, the projected capacitive touch screen uses multiple layers of ITO layers to form a matrix distribution, with the X-axis and Y-axis cross-distribution as the capacitance matrix, when the finger When you touch the screen, you can detect the capacitance of the touch position by scanning the X and Y axes, and then calculate the position of the finger contact. Based on this architecture, the projected capacitor can be multi-touch operated. There are two types of capacitive capacitive touch screens: self-capacitance and cross-capacitance. Self-capacitance, also known as absolute capacitance, is a widely used method. It treats the perceived object as the other plate of the capacitor that induces a charge between the sensing electrode and the sensed electrode, and is thus perceived that the measured charge is stored in the resulting capacitance. Human-computer interaction research based on multi-touch technology The self-capacitive touch screen realizes the multi-touch recognition gesture direction, that is, only detects and distinguishes multi-touch behaviors, such as zooming, dragging, rotating, etc., and the implementation is axis interleaved. technology. It is a diamond shape sensing unit plan on the conductive layer, and each layer requires a conductive layer. Taking the two-axis type as an example, when detecting the touch behavior, the sensing controller scans the horizontal axis and the vertical axis respectively, and the horizontal and vertical sensing points of the capacitive sticks will have rising peaks, and the two axes meet. It is a touch point. Although the axis interleaving can realize the multi-touch gesture recognition function, it is still difficult to locate the correct position of multiple contacts. Because when two axial scans are performed, the two touch points respectively generate two peaks on the X-axis and the Y-axis, and the intersection is four contacts, two of which are pseudo-touch points. This will make the system unable to interpret correctly.

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