Microsoft has a pre-touch technology developed for mobile devices. This technology uses sensors around the screen of the mobile phone to predict the owner's next move and react accordingly. In fact, the core of the pre-touch technology is hover touch technology. In addition to Microsoft, Sony, Samsung, Amazon and many other manufacturers are also deep-growing this technology. Since the birth of the touch screen, people have not stopped upgrading their technology. Hover touch technology was once considered a gimmick. In fact, its role and significance far exceeds this. What is hover touch Suspension touch is a new technology that attracts more and more attention from users nowadays. It has been applied to smart phones and other very few digital products, and is still developing. Nowadays, the user is most concerned about the mobile touch screen hovering touch technology, which is a brand-new technology model for touch screen mobile phones. Hover touch technology not only touches the screen with fingers, but also senses the operation of non-conductive cloth fabrics. That is to say, after wearing gloves in winter, it is still free to use the phone, or our fingers do not touch at all. You can operate the phone when you are on the phone screen. For example, Floating Touch hovering touch technology allows users to use the mobile phone without touching the screen to complete the operation of the mobile phone. The finger and the screen can guarantee a distance of about 15mm to get a mouse-like operation on the mobile phone. How hovering touch technology works Like many smart phones, capacitive touch sensing records the user's input on the screen. The events that occur when you touch the screen of your phone are called touch events. Capacitive touch works through an XY electrode grid that covers the phone and uses the above voltage. When there is a finger near the electrode, the capacitance changes and can be measured. By comparing the measured values ​​of all electrodes, the position of the finger can be accurately located. There are two types of capacitive sensors on the touch screen, mutual capacitance and self capacitance. Mutual capacitance for multi-touch detection. The self-capacitance can generate a stronger signal than the mutual capacitance and detect farther finger sensing, but due to a kind of “ghosting†effect, multi-point detection cannot be performed. Circles represent touch points, red X represents ghost positions Mutual capacitance realizes multi-touch With mutual capacitance, each line intersection in the above figure will form a parallel plate capacitor. This means that each intersection is a capacitor, which in turn guarantees that the measurement can be accurate to each finger, enabling multi-touch. However, because the area of ​​the intersection between the two lines is small, the electric field of the sensor is also small. The sensor is so small that the signal strength is so low that it can't sense very weak signals. Therefore, when the user's finger is hovered on the screen, the mutual capacitance sensor cannot sense the signal. Self-capacitance and ghosting effect In the self-capacitance case, each X or Y line in the above figure is a capacitive sensor. Obviously, the self-capacitance sensor is larger than the mutual capacitance. A large sensor can create a powerful signal so that the device can detect a finger 20mm above the screen. When a finger is on the screen or at the top of the screen, the sensor line closest to the finger is activated (X1, Y0). If two fingers are detected, four lines are activated and ghosting effects occur. As shown in the figure above, when two fingers are detected, four possible touch points (X1, Y0), (X1, Y2), (X3, Y0), and (X3, Y2) appear. The combination is not clear, and it is not possible to achieve multi-touch. With self-capacitance and mutual capacitance, hover touch Hover touch is achieved by running a self-capacitance and mutual capacitance on a capacitive touch screen. Mutual capacitance is used to complete normal touch sensing, including multi-touch. The self-capacitance is used to detect the finger hovering above. Since hovering touch technology relies on self-capacitance, floating multi-touch is not possible. That is, the screen does not support multi-touch when it is hovering. The screen can only be multi-touched when touched. By using existing capacitive touch sensors to reduce the threshold of touch entry, it is possible to distinguish between suspension touch and contact touch. All Android applications work perfectly fine. Just as before, applications that only explicitly "listen" for hovering touch events will react. In other words, the implementation of hovering touch technology requires the support of internal applications. Suspended touch screen The significance of floating touch technology in practical applications Hovering touch technology is a brand-new technology model applied to touch screen mobile devices. The effect can be roughly known before the touch, similar to what button or word we move the mouse to, and if it can be operated, it will be prompted by color change. Hover touch technology not only touches the screen with fingers, but also senses non-conductive fabrics. In other words, after wearing gloves in the winter, you can still control the touch screen device. In addition, with this technology, the user can still operate the mobile phone as usual when there is water or oil on the hands, and there is no need to worry about soiling the screen. Suspension touch technology is very popular among major mobile phone giants. In recent years, companies have been cultivating hovering touch technology. The "pre-touch" technology released by Microsoft is actually well-prepared. In the past few years, Microsoft has been developing 3D touch technology. This technique detects the user's finger hanging over the screen and then causes the operating system and program to react to it. Microsoft originally wanted to apply 3D touch technology to mobile phones and tablets. However, this technology was not available. However, today's pre-touch technology is likely to be based on 3D touch technology. Microsoft Microsystems released a video explaining the pre-touch technology, showing how the technology predicts the user's movements through sensors around the screen. In three-dimensional form, the sensor can analyze the user's grip posture and finger movements to provide an easy-to-use location and display related content. For example, when holding the phone with one hand, the pre-touch technology will bring up a dial for thumb touch. In addition, the sensor can also lock the direction when the user watches a video or e-book, so as to prevent the user from changing the posture and causing the mobile phone to change. Microsoft believes that pre-touch technology will give the touch screen more expressiveness and entertainment. Ken Hinckley, chief researcher at Microsoft, said: It uses human hands as a window of thinking. For mobile interaction, I think it has great potential. In fact, it was Sony who first took action in this defying technology. In 2012, Sony introduced the Xperia Sola MT27i. This is a mobile phone that incorporates the hover touch technology. It can be operated without touching the screen even if it is 15mm away from the screen. Sony's product is the world's first smart phone equipped with hovering touch technology. In addition, Samsung's Galaxy S4 launched in 2013 also embeds the Floating Touch (Hovering Touch Gesture) function; the Amazon Kindle smartphone will use 3D gesture control this year; Apple may also expand the 3D Touch function in future products. , achieve hovering touch mode. Headphone manufacturer OM ONE has launched a Bluetooth speaker that can be continuously suspended in the air. The principle is that both the chassis and the spherical horn have magnetic properties. After the chassis is powered on, it can be suspended in mid-air through the same-pole repulsion principle. The sound emitted in this state is not easily absorbed by other objects, resulting in a lower power quality sound. If this product can be combined with hover touch technology, then users can control the volume of the sound through gestures for a more extreme experience. In fact, there are many applications in which hover touch technology can be applied: Businesses can display products in the window, and customers can feel the real effect of the product without entering the store. Vehicle-mounted devices can recognize drivers' gestures through hovering touch technology to enhance the driving experience. Can make the medical system more perfect, reduce the chance of touching the germs; can work in the smart home, can control the home appliances and so on through the gesture. Hovering touch technology is not yet mature, there are many areas that need improvement, and can not be put into use on a large scale. However, the hovering touch technology will bring a new idea to the application scenarios of smart devices, and even subvert the traditional way of human-computer interaction. It is a kind of gimmick technology or an innovative application. We will wait and see. NINGBO LOUD&CLEAR ELECTRONICS CO.,LIMITED , https://www.loudclearaudio.com
