Multi-touch

Multi-touch (also known as multi-touch, multi-sensor, multiple sensors, translated as Multitouch or Multi-touch) is a number from the computer through the fingers of the user to control the input image application technology. Is the use of interactive technology and hardware to achieve a common technique in the absence of traditional input devices (such as a mouse, keyboard, etc.) in the conduct of human computer interaction.Feature1, multi-touch display interface in the same multi-point or multi-user interactive mode of operation, to abandon the keyboard, mouse, single-point operation. 2, the user can touch a single point through his hands, but also can click, double click, pan, pressing, rolling and rotating touch screen, various gestures, to achieve arbitrary control to better and more comprehensive understanding of the relevant characteristics of the object (text , video, photos, satellite images, three-dimensional simulations and other information). 3, according to customer demand, the appropriate custom touch panels, touch software and multimedia systems; can be used in conjunction with professional graphics software.Edit this paragraph direction gesture recognitionMulti-touch technologyWe now see the most is the Multi-Touch Gesture, the two fingers touch, you can identify the direction of movement of two fingers, but can not determine the specific location, you can zoom, pan, rotate. This multi-touch implementation is relatively simple, axes coordinates, can be realized. The ITO into X, Y axis, can be sensitive to the two-touch operation, but sensitive to touch and touch to detect the exact location of the two concepts. XY axis touch screen can detect the way to the 2nd touch, but can not know the exact location of the second touch. A single touch on each axis produces a single maximum, to conclude that the position of the touch, if there is a second finger touch screen surface, there will be two in each axis maximum. Both the maximum by two different touch to produce, so the system can not accurately judge. Timing for the introduction of some system to determine, if not also put up two fingers, but there is always the same time touching the case, then, the system can not guess. We can not really touch the point called "ghost point", shown in Figure 1. Multi-touch technologyEdit this section identify the location of the fingerMulti-touch technologyMulti-Touch All-Point is a popular topic recently. It can identify the specific location of the touch point, that there is no "ghost point" phenomenon. Identify location of multi-touch gestures can be applied to any touch detection, can be detected, while the ten fingers touch his hands, but also allow other forms of non-finger touch, such as hands, face, fist, and even gloves can be, it is the most user-friendly man-machine interface mode, it is suitable for the application of multi-hand simultaneously, such as game control. Multi-Touch All-Point of scanning each row and each column is the intersection are required to detect a single scan, the scan frequency is the number of rows and columns of the product. For example, a 10-line line, 15 column lines consisting of the touch screen, use the Multi-Touch Gesture axis coordinates, the number of scans required 25 times, and location of multi-touch recognition method requires 150 times. Multi-touch technology Multi-Touch All-Point mutual capacitance-based detection, rather than self-capacitance, self capacitance of each sensor unit detects the capacitance (that is, parasitic capacitance Cp) of the changes, there is the presence of parasitic capacitance finger increase, in order to determine a touch there, and the ranks of mutual capacitance is detected at the intersection of the mutual capacitance (coupling capacitance is Cm) changes, shown in Figure 2, when the cross through the ranks, the ranks of the mutual capacitance between the cause (including : the ranks of the edge capacitance between the sensor unit, the ranks of cross-coupling capacitance generated by overlap), there is the presence of inter-finger capacitance is reduced, we can determine the existence of touch, and accurately determine the location of each touch point.