Optoelectronic whiteboard is the crystallization of the rapid development of modern large-screen display technology, computer data processing technology, new semiconductor material technology, network software technology, etc. It is a comprehensive system that integrates multiple technologies such as material science, electronic technology, computer technology and Internet technology. The digital recording and presentation equipment that can replace the traditional blackboard function will become one of the main auxiliary technical means for modern teaching, office meetings, distance education and information exchange in the future. Optoelectronic whiteboards, also known as digital whiteboards or electronic whiteboards, are digital display systems developed in the 1990s. They are mainly used for meeting information exchange, military training and simulation, classroom or distance education, etc. Display and other occasions. The development of optoelectronic whiteboard technology has fundamentally changed people's traditional blackboard writing and recording presentation methods, adapting to the trend and requirements of informatization development. one. Optoelectronic whiteboard is a new optoelectronic information technology product developed in the past ten years. At present, it has formed a fast-growing industry with huge market potential worldwide. The basis for the realization of optoelectronic whiteboards is the modern large-screen display technology based on computers. This display technology includes the effective application of various projection displays. Using the computer's data processing function and Internet information transfer function, the electronic whiteboard realizes information presentation, editing, printing, blackboard storage and remote interactive sharing. From the perspective of the function realization structure, the electronic whiteboard is mainly composed of a display, a writing board (or screen), a writing pen, and a computer system. The computer system is connected to the projection display or the network. Characteristics of optoelectronic whiteboard 1. Basic writing, drawing and information exchange platform. The function of the platform provided by the optoelectronic whiteboard is unmatched by traditional blackboards and chalks: resource information sharing can be achieved through network interconnection, and real-time information exchange in different places can be realized through powerful data transmission and storage functions of computers. 2. Recovery and update of written content. In addition to replacing the traditional eraser function, optoelectronic whiteboards can realize the editing, storage and restoration of massive information through high-performance computer systems. 3. As needed, the optoelectronic whiteboard system has operation prompts and operation feedback usually provided by computers. Use a special pointing pen instead of a mouse to operate on the writing board of the electronic whiteboard, you can call any application program, you can edit, annotate, save, etc. any operation that can be achieved on the computer using the keyboard and mouse. 4. Other elements. Such as the necessary user rights and electronic signatures and other security protection after the network interconnection, to ensure the safety of information when using optoelectronic whiteboards. Positioning method of optoelectronic whiteboard This is one of the key technologies of optoelectronic whiteboards. Currently, the projection display modes of the optoelectronic whiteboard system in use include flat panel display, light valve projection display, LCD projection display and other methods. Corresponding to different display methods, the main positioning methods of writing in the optoelectronic whiteboard system include ultrasound / infrared, laser scanning, pressure sensing, capacitance / magnetic sensing, etc. The special electromagnetic / capacitance induction signal pen is used as the stroke receiving device for writing whiteboard. When working, according to the electromagnetic / capacitance induction signal where the signal pen is located, the code addressing circuit determines the coordinate positioning or writing tracking record to capture the stroke. It is sent to the computer through the interface, and the computer quickly records the dynamic stroke information on the whiteboard through the positioning core software and performs data processing and storage. The touch-type whiteboard using the pressure-sensing principle is equivalent to a touch screen of a computer. It uses a finger or pen to touch the options on the screen to complete the specified work. The display based on this pressure-sensitive positioning principle is designed with two layers of pressure-sensitive films in front of the screen. When a point on the screen surface is stressed, the two layers of films cause a short circuit at this point, and the positioning drive controller detects the pressure The coordinate value of the point (the position touched by the finger or pen) is sent to the computer via the RS232 interface or USB interface. An optoelectronic whiteboard system based on the positioning principle of the positioning light curtain. In this positioning system, two pairs of corresponding display edges are designed with two sets of light-emitting tubes and photoelectric receiver arrays. When writing blocks the optical path, the coordinates of shading can be determined at this time. position. Based on the principle of ultrasonic / infrared positioning, the optoelectronic whiteboard system is designed with an electronic circuit that can simultaneously emit infrared light and ultrasonic waves on the writing pen / eraser. When working, the infrared signal reaches the receivers located at the two corners of the screen can be ignored, and can be used as ultrasonic transmission By measuring the time and delay of ultrasonic waves reaching the two sensors, the coordinate position of the writing pen can be obtained. The laser scanning positioning method is based on the principle of triangulation to achieve planar positioning. A laser scanning unit is placed at each end of the bottom edge of the screen. The distance between the center positions of the two scanning units is known. During operation, the laser beam of each unit is deflected by a rotating mirror that rotates at a high speed on a plane close to the writing screen Scanning, when the light beam scans the writing pen, it generates scattering or reflection, is received by the photodetector, and sends the signal to the computer. According to the characteristics of the timing signal, the computer can calculate the angular coordinates of the writing pen relative to the two scanning center points. Another positioning method is based on planar optical imaging. This method has a simple structure, but the timely tracking characteristics are limited by the speed of data processing. The positioning method uses a high-resolution camera located in front of or behind the writing screen to directly image the light spot emitted by the writing pen, and after image processing, the position of the writing pen is determined and tracked. Functions of interactive optoelectronic whiteboard By forming an interactive control environment with a computer and a projector, a dedicated optoelectronic writing pen replaces the mouse. Various operations of the computer can be realized and displayed synchronously on the electronic whiteboard. Various operations on the electronic whiteboard can also be displayed synchronously on the computer and can be stored; use active or passive writing pens to write or erase on the electronic whiteboard , For some optoelectronic whiteboard systems, the thickness and color of handwriting can also be adjusted through the function keys of the writing pen; the application software has a powerful library function, commonly used background library, annotation library, page library, link library, etc. The content is very rich and involves The field is very wide, and its content can be added or deleted according to needs; by selecting different software, the computer can automatically recognize the handwritten English letters and Chinese characters to achieve the editing function; Can capture all or part of any software, any file, and can take photos of the current workbook, new workbook, links, gallery, clipboard, and call at any time; can convert the written content into HTML, PPT and other file formats , Operate as needed; the interactive multi-function electronic whiteboard has a workbook. The pages of the workbook can be turned or selected at will. The workbook and the computer desktop can also be converted at any time and at any time. In addition, it also has the functions of zooming in (zooming out), focusing, pulling the screen (up and down, left and right); Internet access, communication functions, direct Internet access and remote direct communication and other special functions. Application of optoelectronic whiteboard In recent years, the research and application of network-based and automated teaching equipment has attracted extensive attention internationally. Electronic whiteboard technology is produced in this background. It can accurately save the text written on the whiteboard, the color graphics of the drawing and even the speaker's voice in real time in the computer. It can display, edit and print the written content on the computer screen, and save and playback the written content and voice content . It can also be shared with more people through projectors and the Internet. An electronic whiteboard system actually constitutes a flexible multifunctional electronic podium (refer to Figure 7). It has a large touch screen with electronic writing board and touch function. It can form the best conference, training, teaching, presentation, and presentation system with a computer and a projector. It is an ideal tool for improving discussion methods in conference rooms. The optoelectronic whiteboard system and ISDN, LAN / WAN and other networks or ordinary telephone lines form a real-time, interactive and efficient conference system, which plays an increasingly important role in e-learning, remote online education, training and various conference fields. Connect the PC and projector through the network, then the electronic whiteboard becomes a projection screen, project the application or file on the computer to the whiteboard, use the electronic pen to operate the application as a mouse, or record the meeting content, and then through RS -232 cable is transmitted to computer PC and sent to each terminal of remote conference. The color electronic pen uses various positioning technologies to accurately locate the position of the electronic pen on the whiteboard, and can store the records written on the whiteboard on the computer. The file format can be saved as BITMAP / TIFF / JPEG format. Electronic podium function template. The functions of slide, blackboard, and whiteboard can be displayed on a large screen through the projector and the content written on the computer display screen through the projection system. A variety of writing tools such as pens, brushes, highlighters and a variety of color options. All these simple and easy-to-use functions greatly enhance the interactivity of multimedia teaching and better integrate the teaching content into multimedia teaching. Development trend of optoelectronic whiteboard Electronic podium (E-Board I), combined with computer and projector, can constitute an advanced and simple-to-use electronic teaching system. The electronic podium is a product that combines large-screen display technology with advanced digital positioning technology. Using a special writing pen, you can write on the display screen or projection screen at will. Not only can you complete the operation of the computer, but also at any time. Real-time annotation on the display interface, all real-time annotations along with the content on the interface can be stored for printing or distribution. This greatly enhances the interactivity of multimedia teaching and better integrates teachers' rich teaching experience into multimedia teaching. The electronic whiteboard system is widely used in education, office, conference and other fields. The system is mainly composed of dedicated pen / wiper, screen, projection system and computer. Among them, the plane positioning technology to determine and track the pen / wiper is One of the most core technologies is the basis for ensuring temporal resolution and spatial resolution. The existing positioning technology principles are as follows: touch, wireless positioning, scanning and imaging positioning methods, which will be continuously studied in the future New positioning methods and writing pens, in which the design of the writing pen is diversified, combined with pressure / angle, time and other sensing / sensing technologies, may realize calligraphic writing and painting, making the function of the optoelectronic whiteboard more user-friendly, and the development space will also be Wider. 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