China Education Equipment News: According to statistics from relevant departments, there are currently over 20 million users who use projectors across the country. Now whether in teaching or business, the use of projectors has been quite popular, but many of them are used in projectors. Users feel that it is a pity that they cannot interact with computer systems in a more intuitive and clear way. With the launch of the interactive photon whiteboard, this regret has been resolved for us.
If it is a "whiteboard", everyone is already familiar with it. This is a common office supplies and teaching equipment, but what is the "photon whiteboard"? What are its characteristics? Photon whiteboard is also called portable electronic whiteboard, then we First understand the basics of electronic whiteboards. Simply put, an electronic whiteboard is similar to a super-large computer external touch screen or a handwriting board. It combines a computer and a projector with a certain sensing principle. Users can write text and graphics on it, and then output it through an output component or directly to Save it in the computer connected to it. In the application, the user projects the information in the computer onto the "electronic whiteboard" through the projector. During the use of the projector, he can write at any time, insert new content at any time, and effectively control the process. At the same time, users can also operate the information in the computer directly on the "electronic whiteboard" through professional software, which effectively realizes human-computer interaction and fully attracts the viewer's attention. Especially in teaching, students can directly write any questions on the "electronic whiteboard", which facilitates the communication and interaction between teachers and students.
The core of the electronic whiteboard is that users can directly input on it and interact with the computer system. So which technology does it use? Understand, it is very helpful for the actual purchase. The technologies used in "whiteboard" are mainly the following five.
(1) Pressure sensing technology
Using the "electronic whiteboard" of pressure-sensing technology, users can understand it as a very large-scale computer touch screen. The principle is that there is a pressure film sensing layer composed of a series of resistance films, insulating grids, and conductive films on the "electronic whiteboard". When a point on the sensing layer receives pressure, the point will be connected to the circuit (some products use the opposite method to make the point short circuit), the controller of the "electronic whiteboard" will detect the pressure point The coordinate values ​​are then input into the computer system for processing. The advantage of pressure-sensing technology is that there is no need to use a special pen, and only a non-sharp pen can be used. At the same time, the requirements for power supply are also low, and the USB interface can be used for power supply. However, it also has a disadvantage, that is, it requires hard work when writing, and the user will be tired after a long time, and the reaction speed will be slightly delayed. At the same time, the size of the whiteboard is also limited, so it cannot be made too large.
(2) Electromagnetic induction technology
Electromagnetic induction technology is that the surface of the "electronic whiteboard" has horizontal and vertical receiving coil films, and the size of the film is the same as the area to be displayed. Accompanying it is a pen that can emit electromagnetic waves. When used, it will emit electromagnetic waves in an intermittent manner. When the pen is close to the receiving coil film, the coil will induce the electromagnetic waves emitted by the pen. The electromotive force induced by the coil group closest to the pen is the highest, and the electromotive force far away is low. According to the horizontal and vertical induced electromotive force, the coordinate position is obtained through the calculation of the controller. The advantages of electromagnetic induction technology are accurate positioning, fast response time and short delay time. However, its shortcomings are poor anti-interference, such as being easily interfered by mobile phone signals during use, and the heat generated by the device is relatively large.
(3) Laser technology
Laser technology is to install laser transmitters on both sides of the "electronic whiteboard". After the device is started, the laser emitted by the laser transmitter sweeps the surface of the "electronic whiteboard" and operates on the "electronic whiteboard" with a special pen with laser sensing function. The laser transmitter will sense the corresponding position coordinates and then enter Computer processing. The advantage of laser technology is accurate positioning, but relatively high cost.
(4) Ultrasonic technology
Ultrasonic technology is to place ultrasonic receiving devices distributed at a fixed distance on both sides of the "electronic whiteboard", and the pen used for positioning is an ultrasonic transmitter. When the pen moves on the surface of the "electronic whiteboard", the ultrasonic waves emitted It is detected by the receiver, and then the distance between the pen and the two measured receivers is calculated according to the received time, so as to perform positioning. The advantages of ultrasonic technology are accurate positioning, but the disadvantage is that it is relatively affected by temperature, and a special pen is required.
(5) Infrared technology
Infrared technology is equipped with an infrared receiver and a launch tube around the "electronic whiteboard", thus forming a horizontal and vertical scanning grid. When an object blocks a pair of horizontal and vertical scanning intersections in the grid, the coordinates can be located by the infrared position of the blocked horizontal and vertical directions. Infrared technology has accurate positioning, high precision, and relatively low production cost. At the same time, it does not need to use a special pen, but it is easily affected by strong light and other strong infrared rays during use.
(6) Optical information processing technology (photon whiteboard)
Optical information processing technology is photon whiteboard. Its principle is optical information processing technology. Its essence is to transform the projected area into a high-precision optical "touch screen", which can be remotely controlled by light point "click to touch". Specifically, the current "touch screen" is touched by hand or pen, such as the touch screen of an electronic whiteboard, the touch screen of a mobile phone, the touch screen of a bank number machine, the touch screen of an automatic teller machine, and so on. Photon whiteboard is equivalent to changing the screen touched by hand or pen into a screen touched by "light spot".
It should be said that the six technologies have their own advantages, but also have their own disadvantages. (Lizhichao)
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